SemaDeclCXX.cpp revision d3861ce75a308c65b58c0159e2cee58aea2dff1c
1//===------ SemaDeclCXX.cpp - Semantic Analysis for C++ Declarations ------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements semantic analysis for C++ declarations. 11// 12//===----------------------------------------------------------------------===// 13 14#include "clang/Sema/SemaInternal.h" 15#include "clang/Sema/CXXFieldCollector.h" 16#include "clang/Sema/Scope.h" 17#include "clang/Sema/Initialization.h" 18#include "clang/Sema/Lookup.h" 19#include "clang/Sema/ScopeInfo.h" 20#include "clang/AST/ASTConsumer.h" 21#include "clang/AST/ASTContext.h" 22#include "clang/AST/ASTMutationListener.h" 23#include "clang/AST/CharUnits.h" 24#include "clang/AST/CXXInheritance.h" 25#include "clang/AST/DeclVisitor.h" 26#include "clang/AST/ExprCXX.h" 27#include "clang/AST/RecordLayout.h" 28#include "clang/AST/RecursiveASTVisitor.h" 29#include "clang/AST/StmtVisitor.h" 30#include "clang/AST/TypeLoc.h" 31#include "clang/AST/TypeOrdering.h" 32#include "clang/Sema/DeclSpec.h" 33#include "clang/Sema/ParsedTemplate.h" 34#include "clang/Basic/PartialDiagnostic.h" 35#include "clang/Lex/Preprocessor.h" 36#include "llvm/ADT/SmallString.h" 37#include "llvm/ADT/STLExtras.h" 38#include <map> 39#include <set> 40 41using namespace clang; 42 43//===----------------------------------------------------------------------===// 44// CheckDefaultArgumentVisitor 45//===----------------------------------------------------------------------===// 46 47namespace { 48 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses 49 /// the default argument of a parameter to determine whether it 50 /// contains any ill-formed subexpressions. For example, this will 51 /// diagnose the use of local variables or parameters within the 52 /// default argument expression. 53 class CheckDefaultArgumentVisitor 54 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { 55 Expr *DefaultArg; 56 Sema *S; 57 58 public: 59 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) 60 : DefaultArg(defarg), S(s) {} 61 62 bool VisitExpr(Expr *Node); 63 bool VisitDeclRefExpr(DeclRefExpr *DRE); 64 bool VisitCXXThisExpr(CXXThisExpr *ThisE); 65 bool VisitLambdaExpr(LambdaExpr *Lambda); 66 }; 67 68 /// VisitExpr - Visit all of the children of this expression. 69 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 70 bool IsInvalid = false; 71 for (Stmt::child_range I = Node->children(); I; ++I) 72 IsInvalid |= Visit(*I); 73 return IsInvalid; 74 } 75 76 /// VisitDeclRefExpr - Visit a reference to a declaration, to 77 /// determine whether this declaration can be used in the default 78 /// argument expression. 79 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { 80 NamedDecl *Decl = DRE->getDecl(); 81 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { 82 // C++ [dcl.fct.default]p9 83 // Default arguments are evaluated each time the function is 84 // called. The order of evaluation of function arguments is 85 // unspecified. Consequently, parameters of a function shall not 86 // be used in default argument expressions, even if they are not 87 // evaluated. Parameters of a function declared before a default 88 // argument expression are in scope and can hide namespace and 89 // class member names. 90 return S->Diag(DRE->getLocStart(), 91 diag::err_param_default_argument_references_param) 92 << Param->getDeclName() << DefaultArg->getSourceRange(); 93 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { 94 // C++ [dcl.fct.default]p7 95 // Local variables shall not be used in default argument 96 // expressions. 97 if (VDecl->isLocalVarDecl()) 98 return S->Diag(DRE->getLocStart(), 99 diag::err_param_default_argument_references_local) 100 << VDecl->getDeclName() << DefaultArg->getSourceRange(); 101 } 102 103 return false; 104 } 105 106 /// VisitCXXThisExpr - Visit a C++ "this" expression. 107 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { 108 // C++ [dcl.fct.default]p8: 109 // The keyword this shall not be used in a default argument of a 110 // member function. 111 return S->Diag(ThisE->getLocStart(), 112 diag::err_param_default_argument_references_this) 113 << ThisE->getSourceRange(); 114 } 115 116 bool CheckDefaultArgumentVisitor::VisitLambdaExpr(LambdaExpr *Lambda) { 117 // C++11 [expr.lambda.prim]p13: 118 // A lambda-expression appearing in a default argument shall not 119 // implicitly or explicitly capture any entity. 120 if (Lambda->capture_begin() == Lambda->capture_end()) 121 return false; 122 123 return S->Diag(Lambda->getLocStart(), 124 diag::err_lambda_capture_default_arg); 125 } 126} 127 128void Sema::ImplicitExceptionSpecification::CalledDecl(SourceLocation CallLoc, 129 CXXMethodDecl *Method) { 130 // If we have an MSAny or unknown spec already, don't bother. 131 if (!Method || ComputedEST == EST_MSAny || ComputedEST == EST_Delayed) 132 return; 133 134 const FunctionProtoType *Proto 135 = Method->getType()->getAs<FunctionProtoType>(); 136 Proto = Self->ResolveExceptionSpec(CallLoc, Proto); 137 if (!Proto) 138 return; 139 140 ExceptionSpecificationType EST = Proto->getExceptionSpecType(); 141 142 // If this function can throw any exceptions, make a note of that. 143 if (EST == EST_Delayed || EST == EST_MSAny || EST == EST_None) { 144 ClearExceptions(); 145 ComputedEST = EST; 146 return; 147 } 148 149 // FIXME: If the call to this decl is using any of its default arguments, we 150 // need to search them for potentially-throwing calls. 151 152 // If this function has a basic noexcept, it doesn't affect the outcome. 153 if (EST == EST_BasicNoexcept) 154 return; 155 156 // If we have a throw-all spec at this point, ignore the function. 157 if (ComputedEST == EST_None) 158 return; 159 160 // If we're still at noexcept(true) and there's a nothrow() callee, 161 // change to that specification. 162 if (EST == EST_DynamicNone) { 163 if (ComputedEST == EST_BasicNoexcept) 164 ComputedEST = EST_DynamicNone; 165 return; 166 } 167 168 // Check out noexcept specs. 169 if (EST == EST_ComputedNoexcept) { 170 FunctionProtoType::NoexceptResult NR = 171 Proto->getNoexceptSpec(Self->Context); 172 assert(NR != FunctionProtoType::NR_NoNoexcept && 173 "Must have noexcept result for EST_ComputedNoexcept."); 174 assert(NR != FunctionProtoType::NR_Dependent && 175 "Should not generate implicit declarations for dependent cases, " 176 "and don't know how to handle them anyway."); 177 178 // noexcept(false) -> no spec on the new function 179 if (NR == FunctionProtoType::NR_Throw) { 180 ClearExceptions(); 181 ComputedEST = EST_None; 182 } 183 // noexcept(true) won't change anything either. 184 return; 185 } 186 187 assert(EST == EST_Dynamic && "EST case not considered earlier."); 188 assert(ComputedEST != EST_None && 189 "Shouldn't collect exceptions when throw-all is guaranteed."); 190 ComputedEST = EST_Dynamic; 191 // Record the exceptions in this function's exception specification. 192 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(), 193 EEnd = Proto->exception_end(); 194 E != EEnd; ++E) 195 if (ExceptionsSeen.insert(Self->Context.getCanonicalType(*E))) 196 Exceptions.push_back(*E); 197} 198 199void Sema::ImplicitExceptionSpecification::CalledExpr(Expr *E) { 200 if (!E || ComputedEST == EST_MSAny || ComputedEST == EST_Delayed) 201 return; 202 203 // FIXME: 204 // 205 // C++0x [except.spec]p14: 206 // [An] implicit exception-specification specifies the type-id T if and 207 // only if T is allowed by the exception-specification of a function directly 208 // invoked by f's implicit definition; f shall allow all exceptions if any 209 // function it directly invokes allows all exceptions, and f shall allow no 210 // exceptions if every function it directly invokes allows no exceptions. 211 // 212 // Note in particular that if an implicit exception-specification is generated 213 // for a function containing a throw-expression, that specification can still 214 // be noexcept(true). 215 // 216 // Note also that 'directly invoked' is not defined in the standard, and there 217 // is no indication that we should only consider potentially-evaluated calls. 218 // 219 // Ultimately we should implement the intent of the standard: the exception 220 // specification should be the set of exceptions which can be thrown by the 221 // implicit definition. For now, we assume that any non-nothrow expression can 222 // throw any exception. 223 224 if (Self->canThrow(E)) 225 ComputedEST = EST_None; 226} 227 228bool 229Sema::SetParamDefaultArgument(ParmVarDecl *Param, Expr *Arg, 230 SourceLocation EqualLoc) { 231 if (RequireCompleteType(Param->getLocation(), Param->getType(), 232 diag::err_typecheck_decl_incomplete_type)) { 233 Param->setInvalidDecl(); 234 return true; 235 } 236 237 // C++ [dcl.fct.default]p5 238 // A default argument expression is implicitly converted (clause 239 // 4) to the parameter type. The default argument expression has 240 // the same semantic constraints as the initializer expression in 241 // a declaration of a variable of the parameter type, using the 242 // copy-initialization semantics (8.5). 243 InitializedEntity Entity = InitializedEntity::InitializeParameter(Context, 244 Param); 245 InitializationKind Kind = InitializationKind::CreateCopy(Param->getLocation(), 246 EqualLoc); 247 InitializationSequence InitSeq(*this, Entity, Kind, &Arg, 1); 248 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 249 MultiExprArg(*this, &Arg, 1)); 250 if (Result.isInvalid()) 251 return true; 252 Arg = Result.takeAs<Expr>(); 253 254 CheckImplicitConversions(Arg, EqualLoc); 255 Arg = MaybeCreateExprWithCleanups(Arg); 256 257 // Okay: add the default argument to the parameter 258 Param->setDefaultArg(Arg); 259 260 // We have already instantiated this parameter; provide each of the 261 // instantiations with the uninstantiated default argument. 262 UnparsedDefaultArgInstantiationsMap::iterator InstPos 263 = UnparsedDefaultArgInstantiations.find(Param); 264 if (InstPos != UnparsedDefaultArgInstantiations.end()) { 265 for (unsigned I = 0, N = InstPos->second.size(); I != N; ++I) 266 InstPos->second[I]->setUninstantiatedDefaultArg(Arg); 267 268 // We're done tracking this parameter's instantiations. 269 UnparsedDefaultArgInstantiations.erase(InstPos); 270 } 271 272 return false; 273} 274 275/// ActOnParamDefaultArgument - Check whether the default argument 276/// provided for a function parameter is well-formed. If so, attach it 277/// to the parameter declaration. 278void 279Sema::ActOnParamDefaultArgument(Decl *param, SourceLocation EqualLoc, 280 Expr *DefaultArg) { 281 if (!param || !DefaultArg) 282 return; 283 284 ParmVarDecl *Param = cast<ParmVarDecl>(param); 285 UnparsedDefaultArgLocs.erase(Param); 286 287 // Default arguments are only permitted in C++ 288 if (!getLangOpts().CPlusPlus) { 289 Diag(EqualLoc, diag::err_param_default_argument) 290 << DefaultArg->getSourceRange(); 291 Param->setInvalidDecl(); 292 return; 293 } 294 295 // Check for unexpanded parameter packs. 296 if (DiagnoseUnexpandedParameterPack(DefaultArg, UPPC_DefaultArgument)) { 297 Param->setInvalidDecl(); 298 return; 299 } 300 301 // Check that the default argument is well-formed 302 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg, this); 303 if (DefaultArgChecker.Visit(DefaultArg)) { 304 Param->setInvalidDecl(); 305 return; 306 } 307 308 SetParamDefaultArgument(Param, DefaultArg, EqualLoc); 309} 310 311/// ActOnParamUnparsedDefaultArgument - We've seen a default 312/// argument for a function parameter, but we can't parse it yet 313/// because we're inside a class definition. Note that this default 314/// argument will be parsed later. 315void Sema::ActOnParamUnparsedDefaultArgument(Decl *param, 316 SourceLocation EqualLoc, 317 SourceLocation ArgLoc) { 318 if (!param) 319 return; 320 321 ParmVarDecl *Param = cast<ParmVarDecl>(param); 322 if (Param) 323 Param->setUnparsedDefaultArg(); 324 325 UnparsedDefaultArgLocs[Param] = ArgLoc; 326} 327 328/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 329/// the default argument for the parameter param failed. 330void Sema::ActOnParamDefaultArgumentError(Decl *param) { 331 if (!param) 332 return; 333 334 ParmVarDecl *Param = cast<ParmVarDecl>(param); 335 336 Param->setInvalidDecl(); 337 338 UnparsedDefaultArgLocs.erase(Param); 339} 340 341/// CheckExtraCXXDefaultArguments - Check for any extra default 342/// arguments in the declarator, which is not a function declaration 343/// or definition and therefore is not permitted to have default 344/// arguments. This routine should be invoked for every declarator 345/// that is not a function declaration or definition. 346void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 347 // C++ [dcl.fct.default]p3 348 // A default argument expression shall be specified only in the 349 // parameter-declaration-clause of a function declaration or in a 350 // template-parameter (14.1). It shall not be specified for a 351 // parameter pack. If it is specified in a 352 // parameter-declaration-clause, it shall not occur within a 353 // declarator or abstract-declarator of a parameter-declaration. 354 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 355 DeclaratorChunk &chunk = D.getTypeObject(i); 356 if (chunk.Kind == DeclaratorChunk::Function) { 357 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 358 ParmVarDecl *Param = 359 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param); 360 if (Param->hasUnparsedDefaultArg()) { 361 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 362 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 363 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); 364 delete Toks; 365 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 366 } else if (Param->getDefaultArg()) { 367 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 368 << Param->getDefaultArg()->getSourceRange(); 369 Param->setDefaultArg(0); 370 } 371 } 372 } 373 } 374} 375 376// MergeCXXFunctionDecl - Merge two declarations of the same C++ 377// function, once we already know that they have the same 378// type. Subroutine of MergeFunctionDecl. Returns true if there was an 379// error, false otherwise. 380bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old, 381 Scope *S) { 382 bool Invalid = false; 383 384 // C++ [dcl.fct.default]p4: 385 // For non-template functions, default arguments can be added in 386 // later declarations of a function in the same 387 // scope. Declarations in different scopes have completely 388 // distinct sets of default arguments. That is, declarations in 389 // inner scopes do not acquire default arguments from 390 // declarations in outer scopes, and vice versa. In a given 391 // function declaration, all parameters subsequent to a 392 // parameter with a default argument shall have default 393 // arguments supplied in this or previous declarations. A 394 // default argument shall not be redefined by a later 395 // declaration (not even to the same value). 396 // 397 // C++ [dcl.fct.default]p6: 398 // Except for member functions of class templates, the default arguments 399 // in a member function definition that appears outside of the class 400 // definition are added to the set of default arguments provided by the 401 // member function declaration in the class definition. 402 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 403 ParmVarDecl *OldParam = Old->getParamDecl(p); 404 ParmVarDecl *NewParam = New->getParamDecl(p); 405 406 bool OldParamHasDfl = OldParam->hasDefaultArg(); 407 bool NewParamHasDfl = NewParam->hasDefaultArg(); 408 409 NamedDecl *ND = Old; 410 if (S && !isDeclInScope(ND, New->getDeclContext(), S)) 411 // Ignore default parameters of old decl if they are not in 412 // the same scope. 413 OldParamHasDfl = false; 414 415 if (OldParamHasDfl && NewParamHasDfl) { 416 417 unsigned DiagDefaultParamID = 418 diag::err_param_default_argument_redefinition; 419 420 // MSVC accepts that default parameters be redefined for member functions 421 // of template class. The new default parameter's value is ignored. 422 Invalid = true; 423 if (getLangOpts().MicrosoftExt) { 424 CXXMethodDecl* MD = dyn_cast<CXXMethodDecl>(New); 425 if (MD && MD->getParent()->getDescribedClassTemplate()) { 426 // Merge the old default argument into the new parameter. 427 NewParam->setHasInheritedDefaultArg(); 428 if (OldParam->hasUninstantiatedDefaultArg()) 429 NewParam->setUninstantiatedDefaultArg( 430 OldParam->getUninstantiatedDefaultArg()); 431 else 432 NewParam->setDefaultArg(OldParam->getInit()); 433 DiagDefaultParamID = diag::warn_param_default_argument_redefinition; 434 Invalid = false; 435 } 436 } 437 438 // FIXME: If we knew where the '=' was, we could easily provide a fix-it 439 // hint here. Alternatively, we could walk the type-source information 440 // for NewParam to find the last source location in the type... but it 441 // isn't worth the effort right now. This is the kind of test case that 442 // is hard to get right: 443 // int f(int); 444 // void g(int (*fp)(int) = f); 445 // void g(int (*fp)(int) = &f); 446 Diag(NewParam->getLocation(), DiagDefaultParamID) 447 << NewParam->getDefaultArgRange(); 448 449 // Look for the function declaration where the default argument was 450 // actually written, which may be a declaration prior to Old. 451 for (FunctionDecl *Older = Old->getPreviousDecl(); 452 Older; Older = Older->getPreviousDecl()) { 453 if (!Older->getParamDecl(p)->hasDefaultArg()) 454 break; 455 456 OldParam = Older->getParamDecl(p); 457 } 458 459 Diag(OldParam->getLocation(), diag::note_previous_definition) 460 << OldParam->getDefaultArgRange(); 461 } else if (OldParamHasDfl) { 462 // Merge the old default argument into the new parameter. 463 // It's important to use getInit() here; getDefaultArg() 464 // strips off any top-level ExprWithCleanups. 465 NewParam->setHasInheritedDefaultArg(); 466 if (OldParam->hasUninstantiatedDefaultArg()) 467 NewParam->setUninstantiatedDefaultArg( 468 OldParam->getUninstantiatedDefaultArg()); 469 else 470 NewParam->setDefaultArg(OldParam->getInit()); 471 } else if (NewParamHasDfl) { 472 if (New->getDescribedFunctionTemplate()) { 473 // Paragraph 4, quoted above, only applies to non-template functions. 474 Diag(NewParam->getLocation(), 475 diag::err_param_default_argument_template_redecl) 476 << NewParam->getDefaultArgRange(); 477 Diag(Old->getLocation(), diag::note_template_prev_declaration) 478 << false; 479 } else if (New->getTemplateSpecializationKind() 480 != TSK_ImplicitInstantiation && 481 New->getTemplateSpecializationKind() != TSK_Undeclared) { 482 // C++ [temp.expr.spec]p21: 483 // Default function arguments shall not be specified in a declaration 484 // or a definition for one of the following explicit specializations: 485 // - the explicit specialization of a function template; 486 // - the explicit specialization of a member function template; 487 // - the explicit specialization of a member function of a class 488 // template where the class template specialization to which the 489 // member function specialization belongs is implicitly 490 // instantiated. 491 Diag(NewParam->getLocation(), diag::err_template_spec_default_arg) 492 << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization) 493 << New->getDeclName() 494 << NewParam->getDefaultArgRange(); 495 } else if (New->getDeclContext()->isDependentContext()) { 496 // C++ [dcl.fct.default]p6 (DR217): 497 // Default arguments for a member function of a class template shall 498 // be specified on the initial declaration of the member function 499 // within the class template. 500 // 501 // Reading the tea leaves a bit in DR217 and its reference to DR205 502 // leads me to the conclusion that one cannot add default function 503 // arguments for an out-of-line definition of a member function of a 504 // dependent type. 505 int WhichKind = 2; 506 if (CXXRecordDecl *Record 507 = dyn_cast<CXXRecordDecl>(New->getDeclContext())) { 508 if (Record->getDescribedClassTemplate()) 509 WhichKind = 0; 510 else if (isa<ClassTemplatePartialSpecializationDecl>(Record)) 511 WhichKind = 1; 512 else 513 WhichKind = 2; 514 } 515 516 Diag(NewParam->getLocation(), 517 diag::err_param_default_argument_member_template_redecl) 518 << WhichKind 519 << NewParam->getDefaultArgRange(); 520 } else if (CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(New)) { 521 CXXSpecialMember NewSM = getSpecialMember(Ctor), 522 OldSM = getSpecialMember(cast<CXXConstructorDecl>(Old)); 523 if (NewSM != OldSM) { 524 Diag(NewParam->getLocation(),diag::warn_default_arg_makes_ctor_special) 525 << NewParam->getDefaultArgRange() << NewSM; 526 Diag(Old->getLocation(), diag::note_previous_declaration_special) 527 << OldSM; 528 } 529 } 530 } 531 } 532 533 // C++11 [dcl.constexpr]p1: If any declaration of a function or function 534 // template has a constexpr specifier then all its declarations shall 535 // contain the constexpr specifier. 536 if (New->isConstexpr() != Old->isConstexpr()) { 537 Diag(New->getLocation(), diag::err_constexpr_redecl_mismatch) 538 << New << New->isConstexpr(); 539 Diag(Old->getLocation(), diag::note_previous_declaration); 540 Invalid = true; 541 } 542 543 if (CheckEquivalentExceptionSpec(Old, New)) 544 Invalid = true; 545 546 return Invalid; 547} 548 549/// \brief Merge the exception specifications of two variable declarations. 550/// 551/// This is called when there's a redeclaration of a VarDecl. The function 552/// checks if the redeclaration might have an exception specification and 553/// validates compatibility and merges the specs if necessary. 554void Sema::MergeVarDeclExceptionSpecs(VarDecl *New, VarDecl *Old) { 555 // Shortcut if exceptions are disabled. 556 if (!getLangOpts().CXXExceptions) 557 return; 558 559 assert(Context.hasSameType(New->getType(), Old->getType()) && 560 "Should only be called if types are otherwise the same."); 561 562 QualType NewType = New->getType(); 563 QualType OldType = Old->getType(); 564 565 // We're only interested in pointers and references to functions, as well 566 // as pointers to member functions. 567 if (const ReferenceType *R = NewType->getAs<ReferenceType>()) { 568 NewType = R->getPointeeType(); 569 OldType = OldType->getAs<ReferenceType>()->getPointeeType(); 570 } else if (const PointerType *P = NewType->getAs<PointerType>()) { 571 NewType = P->getPointeeType(); 572 OldType = OldType->getAs<PointerType>()->getPointeeType(); 573 } else if (const MemberPointerType *M = NewType->getAs<MemberPointerType>()) { 574 NewType = M->getPointeeType(); 575 OldType = OldType->getAs<MemberPointerType>()->getPointeeType(); 576 } 577 578 if (!NewType->isFunctionProtoType()) 579 return; 580 581 // There's lots of special cases for functions. For function pointers, system 582 // libraries are hopefully not as broken so that we don't need these 583 // workarounds. 584 if (CheckEquivalentExceptionSpec( 585 OldType->getAs<FunctionProtoType>(), Old->getLocation(), 586 NewType->getAs<FunctionProtoType>(), New->getLocation())) { 587 New->setInvalidDecl(); 588 } 589} 590 591/// CheckCXXDefaultArguments - Verify that the default arguments for a 592/// function declaration are well-formed according to C++ 593/// [dcl.fct.default]. 594void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 595 unsigned NumParams = FD->getNumParams(); 596 unsigned p; 597 598 bool IsLambda = FD->getOverloadedOperator() == OO_Call && 599 isa<CXXMethodDecl>(FD) && 600 cast<CXXMethodDecl>(FD)->getParent()->isLambda(); 601 602 // Find first parameter with a default argument 603 for (p = 0; p < NumParams; ++p) { 604 ParmVarDecl *Param = FD->getParamDecl(p); 605 if (Param->hasDefaultArg()) { 606 // C++11 [expr.prim.lambda]p5: 607 // [...] Default arguments (8.3.6) shall not be specified in the 608 // parameter-declaration-clause of a lambda-declarator. 609 // 610 // FIXME: Core issue 974 strikes this sentence, we only provide an 611 // extension warning. 612 if (IsLambda) 613 Diag(Param->getLocation(), diag::ext_lambda_default_arguments) 614 << Param->getDefaultArgRange(); 615 break; 616 } 617 } 618 619 // C++ [dcl.fct.default]p4: 620 // In a given function declaration, all parameters 621 // subsequent to a parameter with a default argument shall 622 // have default arguments supplied in this or previous 623 // declarations. A default argument shall not be redefined 624 // by a later declaration (not even to the same value). 625 unsigned LastMissingDefaultArg = 0; 626 for (; p < NumParams; ++p) { 627 ParmVarDecl *Param = FD->getParamDecl(p); 628 if (!Param->hasDefaultArg()) { 629 if (Param->isInvalidDecl()) 630 /* We already complained about this parameter. */; 631 else if (Param->getIdentifier()) 632 Diag(Param->getLocation(), 633 diag::err_param_default_argument_missing_name) 634 << Param->getIdentifier(); 635 else 636 Diag(Param->getLocation(), 637 diag::err_param_default_argument_missing); 638 639 LastMissingDefaultArg = p; 640 } 641 } 642 643 if (LastMissingDefaultArg > 0) { 644 // Some default arguments were missing. Clear out all of the 645 // default arguments up to (and including) the last missing 646 // default argument, so that we leave the function parameters 647 // in a semantically valid state. 648 for (p = 0; p <= LastMissingDefaultArg; ++p) { 649 ParmVarDecl *Param = FD->getParamDecl(p); 650 if (Param->hasDefaultArg()) { 651 Param->setDefaultArg(0); 652 } 653 } 654 } 655} 656 657// CheckConstexprParameterTypes - Check whether a function's parameter types 658// are all literal types. If so, return true. If not, produce a suitable 659// diagnostic and return false. 660static bool CheckConstexprParameterTypes(Sema &SemaRef, 661 const FunctionDecl *FD) { 662 unsigned ArgIndex = 0; 663 const FunctionProtoType *FT = FD->getType()->getAs<FunctionProtoType>(); 664 for (FunctionProtoType::arg_type_iterator i = FT->arg_type_begin(), 665 e = FT->arg_type_end(); i != e; ++i, ++ArgIndex) { 666 const ParmVarDecl *PD = FD->getParamDecl(ArgIndex); 667 SourceLocation ParamLoc = PD->getLocation(); 668 if (!(*i)->isDependentType() && 669 SemaRef.RequireLiteralType(ParamLoc, *i, 670 diag::err_constexpr_non_literal_param, 671 ArgIndex+1, PD->getSourceRange(), 672 isa<CXXConstructorDecl>(FD))) 673 return false; 674 } 675 return true; 676} 677 678// CheckConstexprFunctionDecl - Check whether a function declaration satisfies 679// the requirements of a constexpr function definition or a constexpr 680// constructor definition. If so, return true. If not, produce appropriate 681// diagnostics and return false. 682// 683// This implements C++11 [dcl.constexpr]p3,4, as amended by DR1360. 684bool Sema::CheckConstexprFunctionDecl(const FunctionDecl *NewFD) { 685 const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewFD); 686 if (MD && MD->isInstance()) { 687 // C++11 [dcl.constexpr]p4: 688 // The definition of a constexpr constructor shall satisfy the following 689 // constraints: 690 // - the class shall not have any virtual base classes; 691 const CXXRecordDecl *RD = MD->getParent(); 692 if (RD->getNumVBases()) { 693 Diag(NewFD->getLocation(), diag::err_constexpr_virtual_base) 694 << isa<CXXConstructorDecl>(NewFD) << RD->isStruct() 695 << RD->getNumVBases(); 696 for (CXXRecordDecl::base_class_const_iterator I = RD->vbases_begin(), 697 E = RD->vbases_end(); I != E; ++I) 698 Diag(I->getLocStart(), 699 diag::note_constexpr_virtual_base_here) << I->getSourceRange(); 700 return false; 701 } 702 } 703 704 if (!isa<CXXConstructorDecl>(NewFD)) { 705 // C++11 [dcl.constexpr]p3: 706 // The definition of a constexpr function shall satisfy the following 707 // constraints: 708 // - it shall not be virtual; 709 const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD); 710 if (Method && Method->isVirtual()) { 711 Diag(NewFD->getLocation(), diag::err_constexpr_virtual); 712 713 // If it's not obvious why this function is virtual, find an overridden 714 // function which uses the 'virtual' keyword. 715 const CXXMethodDecl *WrittenVirtual = Method; 716 while (!WrittenVirtual->isVirtualAsWritten()) 717 WrittenVirtual = *WrittenVirtual->begin_overridden_methods(); 718 if (WrittenVirtual != Method) 719 Diag(WrittenVirtual->getLocation(), 720 diag::note_overridden_virtual_function); 721 return false; 722 } 723 724 // - its return type shall be a literal type; 725 QualType RT = NewFD->getResultType(); 726 if (!RT->isDependentType() && 727 RequireLiteralType(NewFD->getLocation(), RT, 728 diag::err_constexpr_non_literal_return)) 729 return false; 730 } 731 732 // - each of its parameter types shall be a literal type; 733 if (!CheckConstexprParameterTypes(*this, NewFD)) 734 return false; 735 736 return true; 737} 738 739/// Check the given declaration statement is legal within a constexpr function 740/// body. C++0x [dcl.constexpr]p3,p4. 741/// 742/// \return true if the body is OK, false if we have diagnosed a problem. 743static bool CheckConstexprDeclStmt(Sema &SemaRef, const FunctionDecl *Dcl, 744 DeclStmt *DS) { 745 // C++0x [dcl.constexpr]p3 and p4: 746 // The definition of a constexpr function(p3) or constructor(p4) [...] shall 747 // contain only 748 for (DeclStmt::decl_iterator DclIt = DS->decl_begin(), 749 DclEnd = DS->decl_end(); DclIt != DclEnd; ++DclIt) { 750 switch ((*DclIt)->getKind()) { 751 case Decl::StaticAssert: 752 case Decl::Using: 753 case Decl::UsingShadow: 754 case Decl::UsingDirective: 755 case Decl::UnresolvedUsingTypename: 756 // - static_assert-declarations 757 // - using-declarations, 758 // - using-directives, 759 continue; 760 761 case Decl::Typedef: 762 case Decl::TypeAlias: { 763 // - typedef declarations and alias-declarations that do not define 764 // classes or enumerations, 765 TypedefNameDecl *TN = cast<TypedefNameDecl>(*DclIt); 766 if (TN->getUnderlyingType()->isVariablyModifiedType()) { 767 // Don't allow variably-modified types in constexpr functions. 768 TypeLoc TL = TN->getTypeSourceInfo()->getTypeLoc(); 769 SemaRef.Diag(TL.getBeginLoc(), diag::err_constexpr_vla) 770 << TL.getSourceRange() << TL.getType() 771 << isa<CXXConstructorDecl>(Dcl); 772 return false; 773 } 774 continue; 775 } 776 777 case Decl::Enum: 778 case Decl::CXXRecord: 779 // As an extension, we allow the declaration (but not the definition) of 780 // classes and enumerations in all declarations, not just in typedef and 781 // alias declarations. 782 if (cast<TagDecl>(*DclIt)->isThisDeclarationADefinition()) { 783 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_type_definition) 784 << isa<CXXConstructorDecl>(Dcl); 785 return false; 786 } 787 continue; 788 789 case Decl::Var: 790 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_var_declaration) 791 << isa<CXXConstructorDecl>(Dcl); 792 return false; 793 794 default: 795 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_body_invalid_stmt) 796 << isa<CXXConstructorDecl>(Dcl); 797 return false; 798 } 799 } 800 801 return true; 802} 803 804/// Check that the given field is initialized within a constexpr constructor. 805/// 806/// \param Dcl The constexpr constructor being checked. 807/// \param Field The field being checked. This may be a member of an anonymous 808/// struct or union nested within the class being checked. 809/// \param Inits All declarations, including anonymous struct/union members and 810/// indirect members, for which any initialization was provided. 811/// \param Diagnosed Set to true if an error is produced. 812static void CheckConstexprCtorInitializer(Sema &SemaRef, 813 const FunctionDecl *Dcl, 814 FieldDecl *Field, 815 llvm::SmallSet<Decl*, 16> &Inits, 816 bool &Diagnosed) { 817 if (Field->isUnnamedBitfield()) 818 return; 819 820 if (Field->isAnonymousStructOrUnion() && 821 Field->getType()->getAsCXXRecordDecl()->isEmpty()) 822 return; 823 824 if (!Inits.count(Field)) { 825 if (!Diagnosed) { 826 SemaRef.Diag(Dcl->getLocation(), diag::err_constexpr_ctor_missing_init); 827 Diagnosed = true; 828 } 829 SemaRef.Diag(Field->getLocation(), diag::note_constexpr_ctor_missing_init); 830 } else if (Field->isAnonymousStructOrUnion()) { 831 const RecordDecl *RD = Field->getType()->castAs<RecordType>()->getDecl(); 832 for (RecordDecl::field_iterator I = RD->field_begin(), E = RD->field_end(); 833 I != E; ++I) 834 // If an anonymous union contains an anonymous struct of which any member 835 // is initialized, all members must be initialized. 836 if (!RD->isUnion() || Inits.count(*I)) 837 CheckConstexprCtorInitializer(SemaRef, Dcl, *I, Inits, Diagnosed); 838 } 839} 840 841/// Check the body for the given constexpr function declaration only contains 842/// the permitted types of statement. C++11 [dcl.constexpr]p3,p4. 843/// 844/// \return true if the body is OK, false if we have diagnosed a problem. 845bool Sema::CheckConstexprFunctionBody(const FunctionDecl *Dcl, Stmt *Body) { 846 if (isa<CXXTryStmt>(Body)) { 847 // C++11 [dcl.constexpr]p3: 848 // The definition of a constexpr function shall satisfy the following 849 // constraints: [...] 850 // - its function-body shall be = delete, = default, or a 851 // compound-statement 852 // 853 // C++11 [dcl.constexpr]p4: 854 // In the definition of a constexpr constructor, [...] 855 // - its function-body shall not be a function-try-block; 856 Diag(Body->getLocStart(), diag::err_constexpr_function_try_block) 857 << isa<CXXConstructorDecl>(Dcl); 858 return false; 859 } 860 861 // - its function-body shall be [...] a compound-statement that contains only 862 CompoundStmt *CompBody = cast<CompoundStmt>(Body); 863 864 llvm::SmallVector<SourceLocation, 4> ReturnStmts; 865 for (CompoundStmt::body_iterator BodyIt = CompBody->body_begin(), 866 BodyEnd = CompBody->body_end(); BodyIt != BodyEnd; ++BodyIt) { 867 switch ((*BodyIt)->getStmtClass()) { 868 case Stmt::NullStmtClass: 869 // - null statements, 870 continue; 871 872 case Stmt::DeclStmtClass: 873 // - static_assert-declarations 874 // - using-declarations, 875 // - using-directives, 876 // - typedef declarations and alias-declarations that do not define 877 // classes or enumerations, 878 if (!CheckConstexprDeclStmt(*this, Dcl, cast<DeclStmt>(*BodyIt))) 879 return false; 880 continue; 881 882 case Stmt::ReturnStmtClass: 883 // - and exactly one return statement; 884 if (isa<CXXConstructorDecl>(Dcl)) 885 break; 886 887 ReturnStmts.push_back((*BodyIt)->getLocStart()); 888 continue; 889 890 default: 891 break; 892 } 893 894 Diag((*BodyIt)->getLocStart(), diag::err_constexpr_body_invalid_stmt) 895 << isa<CXXConstructorDecl>(Dcl); 896 return false; 897 } 898 899 if (const CXXConstructorDecl *Constructor 900 = dyn_cast<CXXConstructorDecl>(Dcl)) { 901 const CXXRecordDecl *RD = Constructor->getParent(); 902 // DR1359: 903 // - every non-variant non-static data member and base class sub-object 904 // shall be initialized; 905 // - if the class is a non-empty union, or for each non-empty anonymous 906 // union member of a non-union class, exactly one non-static data member 907 // shall be initialized; 908 if (RD->isUnion()) { 909 if (Constructor->getNumCtorInitializers() == 0 && !RD->isEmpty()) { 910 Diag(Dcl->getLocation(), diag::err_constexpr_union_ctor_no_init); 911 return false; 912 } 913 } else if (!Constructor->isDependentContext() && 914 !Constructor->isDelegatingConstructor()) { 915 assert(RD->getNumVBases() == 0 && "constexpr ctor with virtual bases"); 916 917 // Skip detailed checking if we have enough initializers, and we would 918 // allow at most one initializer per member. 919 bool AnyAnonStructUnionMembers = false; 920 unsigned Fields = 0; 921 for (CXXRecordDecl::field_iterator I = RD->field_begin(), 922 E = RD->field_end(); I != E; ++I, ++Fields) { 923 if (I->isAnonymousStructOrUnion()) { 924 AnyAnonStructUnionMembers = true; 925 break; 926 } 927 } 928 if (AnyAnonStructUnionMembers || 929 Constructor->getNumCtorInitializers() != RD->getNumBases() + Fields) { 930 // Check initialization of non-static data members. Base classes are 931 // always initialized so do not need to be checked. Dependent bases 932 // might not have initializers in the member initializer list. 933 llvm::SmallSet<Decl*, 16> Inits; 934 for (CXXConstructorDecl::init_const_iterator 935 I = Constructor->init_begin(), E = Constructor->init_end(); 936 I != E; ++I) { 937 if (FieldDecl *FD = (*I)->getMember()) 938 Inits.insert(FD); 939 else if (IndirectFieldDecl *ID = (*I)->getIndirectMember()) 940 Inits.insert(ID->chain_begin(), ID->chain_end()); 941 } 942 943 bool Diagnosed = false; 944 for (CXXRecordDecl::field_iterator I = RD->field_begin(), 945 E = RD->field_end(); I != E; ++I) 946 CheckConstexprCtorInitializer(*this, Dcl, *I, Inits, Diagnosed); 947 if (Diagnosed) 948 return false; 949 } 950 } 951 } else { 952 if (ReturnStmts.empty()) { 953 Diag(Dcl->getLocation(), diag::err_constexpr_body_no_return); 954 return false; 955 } 956 if (ReturnStmts.size() > 1) { 957 Diag(ReturnStmts.back(), diag::err_constexpr_body_multiple_return); 958 for (unsigned I = 0; I < ReturnStmts.size() - 1; ++I) 959 Diag(ReturnStmts[I], diag::note_constexpr_body_previous_return); 960 return false; 961 } 962 } 963 964 // C++11 [dcl.constexpr]p5: 965 // if no function argument values exist such that the function invocation 966 // substitution would produce a constant expression, the program is 967 // ill-formed; no diagnostic required. 968 // C++11 [dcl.constexpr]p3: 969 // - every constructor call and implicit conversion used in initializing the 970 // return value shall be one of those allowed in a constant expression. 971 // C++11 [dcl.constexpr]p4: 972 // - every constructor involved in initializing non-static data members and 973 // base class sub-objects shall be a constexpr constructor. 974 llvm::SmallVector<PartialDiagnosticAt, 8> Diags; 975 if (!Expr::isPotentialConstantExpr(Dcl, Diags)) { 976 Diag(Dcl->getLocation(), diag::err_constexpr_function_never_constant_expr) 977 << isa<CXXConstructorDecl>(Dcl); 978 for (size_t I = 0, N = Diags.size(); I != N; ++I) 979 Diag(Diags[I].first, Diags[I].second); 980 return false; 981 } 982 983 return true; 984} 985 986/// isCurrentClassName - Determine whether the identifier II is the 987/// name of the class type currently being defined. In the case of 988/// nested classes, this will only return true if II is the name of 989/// the innermost class. 990bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 991 const CXXScopeSpec *SS) { 992 assert(getLangOpts().CPlusPlus && "No class names in C!"); 993 994 CXXRecordDecl *CurDecl; 995 if (SS && SS->isSet() && !SS->isInvalid()) { 996 DeclContext *DC = computeDeclContext(*SS, true); 997 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 998 } else 999 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 1000 1001 if (CurDecl && CurDecl->getIdentifier()) 1002 return &II == CurDecl->getIdentifier(); 1003 else 1004 return false; 1005} 1006 1007/// \brief Check the validity of a C++ base class specifier. 1008/// 1009/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 1010/// and returns NULL otherwise. 1011CXXBaseSpecifier * 1012Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 1013 SourceRange SpecifierRange, 1014 bool Virtual, AccessSpecifier Access, 1015 TypeSourceInfo *TInfo, 1016 SourceLocation EllipsisLoc) { 1017 QualType BaseType = TInfo->getType(); 1018 1019 // C++ [class.union]p1: 1020 // A union shall not have base classes. 1021 if (Class->isUnion()) { 1022 Diag(Class->getLocation(), diag::err_base_clause_on_union) 1023 << SpecifierRange; 1024 return 0; 1025 } 1026 1027 if (EllipsisLoc.isValid() && 1028 !TInfo->getType()->containsUnexpandedParameterPack()) { 1029 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 1030 << TInfo->getTypeLoc().getSourceRange(); 1031 EllipsisLoc = SourceLocation(); 1032 } 1033 1034 if (BaseType->isDependentType()) 1035 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 1036 Class->getTagKind() == TTK_Class, 1037 Access, TInfo, EllipsisLoc); 1038 1039 SourceLocation BaseLoc = TInfo->getTypeLoc().getBeginLoc(); 1040 1041 // Base specifiers must be record types. 1042 if (!BaseType->isRecordType()) { 1043 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 1044 return 0; 1045 } 1046 1047 // C++ [class.union]p1: 1048 // A union shall not be used as a base class. 1049 if (BaseType->isUnionType()) { 1050 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 1051 return 0; 1052 } 1053 1054 // C++ [class.derived]p2: 1055 // The class-name in a base-specifier shall not be an incompletely 1056 // defined class. 1057 if (RequireCompleteType(BaseLoc, BaseType, 1058 diag::err_incomplete_base_class, SpecifierRange)) { 1059 Class->setInvalidDecl(); 1060 return 0; 1061 } 1062 1063 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 1064 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 1065 assert(BaseDecl && "Record type has no declaration"); 1066 BaseDecl = BaseDecl->getDefinition(); 1067 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 1068 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 1069 assert(CXXBaseDecl && "Base type is not a C++ type"); 1070 1071 // C++ [class]p3: 1072 // If a class is marked final and it appears as a base-type-specifier in 1073 // base-clause, the program is ill-formed. 1074 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 1075 Diag(BaseLoc, diag::err_class_marked_final_used_as_base) 1076 << CXXBaseDecl->getDeclName(); 1077 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 1078 << CXXBaseDecl->getDeclName(); 1079 return 0; 1080 } 1081 1082 if (BaseDecl->isInvalidDecl()) 1083 Class->setInvalidDecl(); 1084 1085 // Create the base specifier. 1086 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 1087 Class->getTagKind() == TTK_Class, 1088 Access, TInfo, EllipsisLoc); 1089} 1090 1091/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 1092/// one entry in the base class list of a class specifier, for 1093/// example: 1094/// class foo : public bar, virtual private baz { 1095/// 'public bar' and 'virtual private baz' are each base-specifiers. 1096BaseResult 1097Sema::ActOnBaseSpecifier(Decl *classdecl, SourceRange SpecifierRange, 1098 bool Virtual, AccessSpecifier Access, 1099 ParsedType basetype, SourceLocation BaseLoc, 1100 SourceLocation EllipsisLoc) { 1101 if (!classdecl) 1102 return true; 1103 1104 AdjustDeclIfTemplate(classdecl); 1105 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl); 1106 if (!Class) 1107 return true; 1108 1109 TypeSourceInfo *TInfo = 0; 1110 GetTypeFromParser(basetype, &TInfo); 1111 1112 if (EllipsisLoc.isInvalid() && 1113 DiagnoseUnexpandedParameterPack(SpecifierRange.getBegin(), TInfo, 1114 UPPC_BaseType)) 1115 return true; 1116 1117 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 1118 Virtual, Access, TInfo, 1119 EllipsisLoc)) 1120 return BaseSpec; 1121 1122 return true; 1123} 1124 1125/// \brief Performs the actual work of attaching the given base class 1126/// specifiers to a C++ class. 1127bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 1128 unsigned NumBases) { 1129 if (NumBases == 0) 1130 return false; 1131 1132 // Used to keep track of which base types we have already seen, so 1133 // that we can properly diagnose redundant direct base types. Note 1134 // that the key is always the unqualified canonical type of the base 1135 // class. 1136 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 1137 1138 // Copy non-redundant base specifiers into permanent storage. 1139 unsigned NumGoodBases = 0; 1140 bool Invalid = false; 1141 for (unsigned idx = 0; idx < NumBases; ++idx) { 1142 QualType NewBaseType 1143 = Context.getCanonicalType(Bases[idx]->getType()); 1144 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 1145 1146 CXXBaseSpecifier *&KnownBase = KnownBaseTypes[NewBaseType]; 1147 if (KnownBase) { 1148 // C++ [class.mi]p3: 1149 // A class shall not be specified as a direct base class of a 1150 // derived class more than once. 1151 Diag(Bases[idx]->getLocStart(), 1152 diag::err_duplicate_base_class) 1153 << KnownBase->getType() 1154 << Bases[idx]->getSourceRange(); 1155 1156 // Delete the duplicate base class specifier; we're going to 1157 // overwrite its pointer later. 1158 Context.Deallocate(Bases[idx]); 1159 1160 Invalid = true; 1161 } else { 1162 // Okay, add this new base class. 1163 KnownBase = Bases[idx]; 1164 Bases[NumGoodBases++] = Bases[idx]; 1165 if (const RecordType *Record = NewBaseType->getAs<RecordType>()) 1166 if (const CXXRecordDecl *RD = cast<CXXRecordDecl>(Record->getDecl())) 1167 if (RD->hasAttr<WeakAttr>()) 1168 Class->addAttr(::new (Context) WeakAttr(SourceRange(), Context)); 1169 } 1170 } 1171 1172 // Attach the remaining base class specifiers to the derived class. 1173 Class->setBases(Bases, NumGoodBases); 1174 1175 // Delete the remaining (good) base class specifiers, since their 1176 // data has been copied into the CXXRecordDecl. 1177 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 1178 Context.Deallocate(Bases[idx]); 1179 1180 return Invalid; 1181} 1182 1183/// ActOnBaseSpecifiers - Attach the given base specifiers to the 1184/// class, after checking whether there are any duplicate base 1185/// classes. 1186void Sema::ActOnBaseSpecifiers(Decl *ClassDecl, CXXBaseSpecifier **Bases, 1187 unsigned NumBases) { 1188 if (!ClassDecl || !Bases || !NumBases) 1189 return; 1190 1191 AdjustDeclIfTemplate(ClassDecl); 1192 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl), 1193 (CXXBaseSpecifier**)(Bases), NumBases); 1194} 1195 1196static CXXRecordDecl *GetClassForType(QualType T) { 1197 if (const RecordType *RT = T->getAs<RecordType>()) 1198 return cast<CXXRecordDecl>(RT->getDecl()); 1199 else if (const InjectedClassNameType *ICT = T->getAs<InjectedClassNameType>()) 1200 return ICT->getDecl(); 1201 else 1202 return 0; 1203} 1204 1205/// \brief Determine whether the type \p Derived is a C++ class that is 1206/// derived from the type \p Base. 1207bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 1208 if (!getLangOpts().CPlusPlus) 1209 return false; 1210 1211 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 1212 if (!DerivedRD) 1213 return false; 1214 1215 CXXRecordDecl *BaseRD = GetClassForType(Base); 1216 if (!BaseRD) 1217 return false; 1218 1219 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 1220 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 1221} 1222 1223/// \brief Determine whether the type \p Derived is a C++ class that is 1224/// derived from the type \p Base. 1225bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 1226 if (!getLangOpts().CPlusPlus) 1227 return false; 1228 1229 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 1230 if (!DerivedRD) 1231 return false; 1232 1233 CXXRecordDecl *BaseRD = GetClassForType(Base); 1234 if (!BaseRD) 1235 return false; 1236 1237 return DerivedRD->isDerivedFrom(BaseRD, Paths); 1238} 1239 1240void Sema::BuildBasePathArray(const CXXBasePaths &Paths, 1241 CXXCastPath &BasePathArray) { 1242 assert(BasePathArray.empty() && "Base path array must be empty!"); 1243 assert(Paths.isRecordingPaths() && "Must record paths!"); 1244 1245 const CXXBasePath &Path = Paths.front(); 1246 1247 // We first go backward and check if we have a virtual base. 1248 // FIXME: It would be better if CXXBasePath had the base specifier for 1249 // the nearest virtual base. 1250 unsigned Start = 0; 1251 for (unsigned I = Path.size(); I != 0; --I) { 1252 if (Path[I - 1].Base->isVirtual()) { 1253 Start = I - 1; 1254 break; 1255 } 1256 } 1257 1258 // Now add all bases. 1259 for (unsigned I = Start, E = Path.size(); I != E; ++I) 1260 BasePathArray.push_back(const_cast<CXXBaseSpecifier*>(Path[I].Base)); 1261} 1262 1263/// \brief Determine whether the given base path includes a virtual 1264/// base class. 1265bool Sema::BasePathInvolvesVirtualBase(const CXXCastPath &BasePath) { 1266 for (CXXCastPath::const_iterator B = BasePath.begin(), 1267 BEnd = BasePath.end(); 1268 B != BEnd; ++B) 1269 if ((*B)->isVirtual()) 1270 return true; 1271 1272 return false; 1273} 1274 1275/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 1276/// conversion (where Derived and Base are class types) is 1277/// well-formed, meaning that the conversion is unambiguous (and 1278/// that all of the base classes are accessible). Returns true 1279/// and emits a diagnostic if the code is ill-formed, returns false 1280/// otherwise. Loc is the location where this routine should point to 1281/// if there is an error, and Range is the source range to highlight 1282/// if there is an error. 1283bool 1284Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 1285 unsigned InaccessibleBaseID, 1286 unsigned AmbigiousBaseConvID, 1287 SourceLocation Loc, SourceRange Range, 1288 DeclarationName Name, 1289 CXXCastPath *BasePath) { 1290 // First, determine whether the path from Derived to Base is 1291 // ambiguous. This is slightly more expensive than checking whether 1292 // the Derived to Base conversion exists, because here we need to 1293 // explore multiple paths to determine if there is an ambiguity. 1294 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1295 /*DetectVirtual=*/false); 1296 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 1297 assert(DerivationOkay && 1298 "Can only be used with a derived-to-base conversion"); 1299 (void)DerivationOkay; 1300 1301 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 1302 if (InaccessibleBaseID) { 1303 // Check that the base class can be accessed. 1304 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(), 1305 InaccessibleBaseID)) { 1306 case AR_inaccessible: 1307 return true; 1308 case AR_accessible: 1309 case AR_dependent: 1310 case AR_delayed: 1311 break; 1312 } 1313 } 1314 1315 // Build a base path if necessary. 1316 if (BasePath) 1317 BuildBasePathArray(Paths, *BasePath); 1318 return false; 1319 } 1320 1321 // We know that the derived-to-base conversion is ambiguous, and 1322 // we're going to produce a diagnostic. Perform the derived-to-base 1323 // search just one more time to compute all of the possible paths so 1324 // that we can print them out. This is more expensive than any of 1325 // the previous derived-to-base checks we've done, but at this point 1326 // performance isn't as much of an issue. 1327 Paths.clear(); 1328 Paths.setRecordingPaths(true); 1329 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 1330 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 1331 (void)StillOkay; 1332 1333 // Build up a textual representation of the ambiguous paths, e.g., 1334 // D -> B -> A, that will be used to illustrate the ambiguous 1335 // conversions in the diagnostic. We only print one of the paths 1336 // to each base class subobject. 1337 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 1338 1339 Diag(Loc, AmbigiousBaseConvID) 1340 << Derived << Base << PathDisplayStr << Range << Name; 1341 return true; 1342} 1343 1344bool 1345Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 1346 SourceLocation Loc, SourceRange Range, 1347 CXXCastPath *BasePath, 1348 bool IgnoreAccess) { 1349 return CheckDerivedToBaseConversion(Derived, Base, 1350 IgnoreAccess ? 0 1351 : diag::err_upcast_to_inaccessible_base, 1352 diag::err_ambiguous_derived_to_base_conv, 1353 Loc, Range, DeclarationName(), 1354 BasePath); 1355} 1356 1357 1358/// @brief Builds a string representing ambiguous paths from a 1359/// specific derived class to different subobjects of the same base 1360/// class. 1361/// 1362/// This function builds a string that can be used in error messages 1363/// to show the different paths that one can take through the 1364/// inheritance hierarchy to go from the derived class to different 1365/// subobjects of a base class. The result looks something like this: 1366/// @code 1367/// struct D -> struct B -> struct A 1368/// struct D -> struct C -> struct A 1369/// @endcode 1370std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 1371 std::string PathDisplayStr; 1372 std::set<unsigned> DisplayedPaths; 1373 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1374 Path != Paths.end(); ++Path) { 1375 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 1376 // We haven't displayed a path to this particular base 1377 // class subobject yet. 1378 PathDisplayStr += "\n "; 1379 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 1380 for (CXXBasePath::const_iterator Element = Path->begin(); 1381 Element != Path->end(); ++Element) 1382 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 1383 } 1384 } 1385 1386 return PathDisplayStr; 1387} 1388 1389//===----------------------------------------------------------------------===// 1390// C++ class member Handling 1391//===----------------------------------------------------------------------===// 1392 1393/// ActOnAccessSpecifier - Parsed an access specifier followed by a colon. 1394bool Sema::ActOnAccessSpecifier(AccessSpecifier Access, 1395 SourceLocation ASLoc, 1396 SourceLocation ColonLoc, 1397 AttributeList *Attrs) { 1398 assert(Access != AS_none && "Invalid kind for syntactic access specifier!"); 1399 AccessSpecDecl *ASDecl = AccessSpecDecl::Create(Context, Access, CurContext, 1400 ASLoc, ColonLoc); 1401 CurContext->addHiddenDecl(ASDecl); 1402 return ProcessAccessDeclAttributeList(ASDecl, Attrs); 1403} 1404 1405/// CheckOverrideControl - Check C++0x override control semantics. 1406void Sema::CheckOverrideControl(const Decl *D) { 1407 const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D); 1408 if (!MD || !MD->isVirtual()) 1409 return; 1410 1411 if (MD->isDependentContext()) 1412 return; 1413 1414 // C++0x [class.virtual]p3: 1415 // If a virtual function is marked with the virt-specifier override and does 1416 // not override a member function of a base class, 1417 // the program is ill-formed. 1418 bool HasOverriddenMethods = 1419 MD->begin_overridden_methods() != MD->end_overridden_methods(); 1420 if (MD->hasAttr<OverrideAttr>() && !HasOverriddenMethods) { 1421 Diag(MD->getLocation(), 1422 diag::err_function_marked_override_not_overriding) 1423 << MD->getDeclName(); 1424 return; 1425 } 1426} 1427 1428/// CheckIfOverriddenFunctionIsMarkedFinal - Checks whether a virtual member 1429/// function overrides a virtual member function marked 'final', according to 1430/// C++0x [class.virtual]p3. 1431bool Sema::CheckIfOverriddenFunctionIsMarkedFinal(const CXXMethodDecl *New, 1432 const CXXMethodDecl *Old) { 1433 if (!Old->hasAttr<FinalAttr>()) 1434 return false; 1435 1436 Diag(New->getLocation(), diag::err_final_function_overridden) 1437 << New->getDeclName(); 1438 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 1439 return true; 1440} 1441 1442static bool InitializationHasSideEffects(const FieldDecl &FD) { 1443 if (!FD.getType().isNull()) { 1444 if (const CXXRecordDecl *RD = FD.getType()->getAsCXXRecordDecl()) { 1445 return !RD->isCompleteDefinition() || 1446 !RD->hasTrivialDefaultConstructor() || 1447 !RD->hasTrivialDestructor(); 1448 } 1449 } 1450 return false; 1451} 1452 1453/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 1454/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 1455/// bitfield width if there is one, 'InitExpr' specifies the initializer if 1456/// one has been parsed, and 'InitStyle' is set if an in-class initializer is 1457/// present (but parsing it has been deferred). 1458Decl * 1459Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 1460 MultiTemplateParamsArg TemplateParameterLists, 1461 Expr *BW, const VirtSpecifiers &VS, 1462 InClassInitStyle InitStyle) { 1463 const DeclSpec &DS = D.getDeclSpec(); 1464 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 1465 DeclarationName Name = NameInfo.getName(); 1466 SourceLocation Loc = NameInfo.getLoc(); 1467 1468 // For anonymous bitfields, the location should point to the type. 1469 if (Loc.isInvalid()) 1470 Loc = D.getLocStart(); 1471 1472 Expr *BitWidth = static_cast<Expr*>(BW); 1473 1474 assert(isa<CXXRecordDecl>(CurContext)); 1475 assert(!DS.isFriendSpecified()); 1476 1477 bool isFunc = D.isDeclarationOfFunction(); 1478 1479 // C++ 9.2p6: A member shall not be declared to have automatic storage 1480 // duration (auto, register) or with the extern storage-class-specifier. 1481 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 1482 // data members and cannot be applied to names declared const or static, 1483 // and cannot be applied to reference members. 1484 switch (DS.getStorageClassSpec()) { 1485 case DeclSpec::SCS_unspecified: 1486 case DeclSpec::SCS_typedef: 1487 case DeclSpec::SCS_static: 1488 // FALL THROUGH. 1489 break; 1490 case DeclSpec::SCS_mutable: 1491 if (isFunc) { 1492 if (DS.getStorageClassSpecLoc().isValid()) 1493 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 1494 else 1495 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 1496 1497 // FIXME: It would be nicer if the keyword was ignored only for this 1498 // declarator. Otherwise we could get follow-up errors. 1499 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1500 } 1501 break; 1502 default: 1503 if (DS.getStorageClassSpecLoc().isValid()) 1504 Diag(DS.getStorageClassSpecLoc(), 1505 diag::err_storageclass_invalid_for_member); 1506 else 1507 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 1508 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1509 } 1510 1511 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 1512 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 1513 !isFunc); 1514 1515 Decl *Member; 1516 if (isInstField) { 1517 CXXScopeSpec &SS = D.getCXXScopeSpec(); 1518 1519 // Data members must have identifiers for names. 1520 if (!Name.isIdentifier()) { 1521 Diag(Loc, diag::err_bad_variable_name) 1522 << Name; 1523 return 0; 1524 } 1525 1526 IdentifierInfo *II = Name.getAsIdentifierInfo(); 1527 1528 // Member field could not be with "template" keyword. 1529 // So TemplateParameterLists should be empty in this case. 1530 if (TemplateParameterLists.size()) { 1531 TemplateParameterList* TemplateParams = TemplateParameterLists.get()[0]; 1532 if (TemplateParams->size()) { 1533 // There is no such thing as a member field template. 1534 Diag(D.getIdentifierLoc(), diag::err_template_member) 1535 << II 1536 << SourceRange(TemplateParams->getTemplateLoc(), 1537 TemplateParams->getRAngleLoc()); 1538 } else { 1539 // There is an extraneous 'template<>' for this member. 1540 Diag(TemplateParams->getTemplateLoc(), 1541 diag::err_template_member_noparams) 1542 << II 1543 << SourceRange(TemplateParams->getTemplateLoc(), 1544 TemplateParams->getRAngleLoc()); 1545 } 1546 return 0; 1547 } 1548 1549 if (SS.isSet() && !SS.isInvalid()) { 1550 // The user provided a superfluous scope specifier inside a class 1551 // definition: 1552 // 1553 // class X { 1554 // int X::member; 1555 // }; 1556 if (DeclContext *DC = computeDeclContext(SS, false)) 1557 diagnoseQualifiedDeclaration(SS, DC, Name, D.getIdentifierLoc()); 1558 else 1559 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 1560 << Name << SS.getRange(); 1561 1562 SS.clear(); 1563 } 1564 1565 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 1566 InitStyle, AS); 1567 assert(Member && "HandleField never returns null"); 1568 } else { 1569 assert(InitStyle == ICIS_NoInit); 1570 1571 Member = HandleDeclarator(S, D, move(TemplateParameterLists)); 1572 if (!Member) { 1573 return 0; 1574 } 1575 1576 // Non-instance-fields can't have a bitfield. 1577 if (BitWidth) { 1578 if (Member->isInvalidDecl()) { 1579 // don't emit another diagnostic. 1580 } else if (isa<VarDecl>(Member)) { 1581 // C++ 9.6p3: A bit-field shall not be a static member. 1582 // "static member 'A' cannot be a bit-field" 1583 Diag(Loc, diag::err_static_not_bitfield) 1584 << Name << BitWidth->getSourceRange(); 1585 } else if (isa<TypedefDecl>(Member)) { 1586 // "typedef member 'x' cannot be a bit-field" 1587 Diag(Loc, diag::err_typedef_not_bitfield) 1588 << Name << BitWidth->getSourceRange(); 1589 } else { 1590 // A function typedef ("typedef int f(); f a;"). 1591 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 1592 Diag(Loc, diag::err_not_integral_type_bitfield) 1593 << Name << cast<ValueDecl>(Member)->getType() 1594 << BitWidth->getSourceRange(); 1595 } 1596 1597 BitWidth = 0; 1598 Member->setInvalidDecl(); 1599 } 1600 1601 Member->setAccess(AS); 1602 1603 // If we have declared a member function template, set the access of the 1604 // templated declaration as well. 1605 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 1606 FunTmpl->getTemplatedDecl()->setAccess(AS); 1607 } 1608 1609 if (VS.isOverrideSpecified()) { 1610 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member); 1611 if (!MD || !MD->isVirtual()) { 1612 Diag(Member->getLocStart(), 1613 diag::override_keyword_only_allowed_on_virtual_member_functions) 1614 << "override" << FixItHint::CreateRemoval(VS.getOverrideLoc()); 1615 } else 1616 MD->addAttr(new (Context) OverrideAttr(VS.getOverrideLoc(), Context)); 1617 } 1618 if (VS.isFinalSpecified()) { 1619 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member); 1620 if (!MD || !MD->isVirtual()) { 1621 Diag(Member->getLocStart(), 1622 diag::override_keyword_only_allowed_on_virtual_member_functions) 1623 << "final" << FixItHint::CreateRemoval(VS.getFinalLoc()); 1624 } else 1625 MD->addAttr(new (Context) FinalAttr(VS.getFinalLoc(), Context)); 1626 } 1627 1628 if (VS.getLastLocation().isValid()) { 1629 // Update the end location of a method that has a virt-specifiers. 1630 if (CXXMethodDecl *MD = dyn_cast_or_null<CXXMethodDecl>(Member)) 1631 MD->setRangeEnd(VS.getLastLocation()); 1632 } 1633 1634 CheckOverrideControl(Member); 1635 1636 assert((Name || isInstField) && "No identifier for non-field ?"); 1637 1638 if (isInstField) { 1639 FieldDecl *FD = cast<FieldDecl>(Member); 1640 FieldCollector->Add(FD); 1641 1642 if (Diags.getDiagnosticLevel(diag::warn_unused_private_field, 1643 FD->getLocation()) 1644 != DiagnosticsEngine::Ignored) { 1645 // Remember all explicit private FieldDecls that have a name, no side 1646 // effects and are not part of a dependent type declaration. 1647 if (!FD->isImplicit() && FD->getDeclName() && 1648 FD->getAccess() == AS_private && 1649 !FD->getParent()->getTypeForDecl()->isDependentType() && 1650 !InitializationHasSideEffects(*FD)) 1651 UnusedPrivateFields.insert(FD); 1652 } 1653 } 1654 1655 return Member; 1656} 1657 1658/// ActOnCXXInClassMemberInitializer - This is invoked after parsing an 1659/// in-class initializer for a non-static C++ class member, and after 1660/// instantiating an in-class initializer in a class template. Such actions 1661/// are deferred until the class is complete. 1662void 1663Sema::ActOnCXXInClassMemberInitializer(Decl *D, SourceLocation InitLoc, 1664 Expr *InitExpr) { 1665 FieldDecl *FD = cast<FieldDecl>(D); 1666 assert(FD->getInClassInitStyle() != ICIS_NoInit && 1667 "must set init style when field is created"); 1668 1669 if (!InitExpr) { 1670 FD->setInvalidDecl(); 1671 FD->removeInClassInitializer(); 1672 return; 1673 } 1674 1675 if (DiagnoseUnexpandedParameterPack(InitExpr, UPPC_Initializer)) { 1676 FD->setInvalidDecl(); 1677 FD->removeInClassInitializer(); 1678 return; 1679 } 1680 1681 ExprResult Init = InitExpr; 1682 if (!FD->getType()->isDependentType() && !InitExpr->isTypeDependent()) { 1683 if (isa<InitListExpr>(InitExpr) && isStdInitializerList(FD->getType(), 0)) { 1684 Diag(FD->getLocation(), diag::warn_dangling_std_initializer_list) 1685 << /*at end of ctor*/1 << InitExpr->getSourceRange(); 1686 } 1687 Expr **Inits = &InitExpr; 1688 unsigned NumInits = 1; 1689 InitializedEntity Entity = InitializedEntity::InitializeMember(FD); 1690 InitializationKind Kind = FD->getInClassInitStyle() == ICIS_ListInit 1691 ? InitializationKind::CreateDirectList(InitExpr->getLocStart()) 1692 : InitializationKind::CreateCopy(InitExpr->getLocStart(), InitLoc); 1693 InitializationSequence Seq(*this, Entity, Kind, Inits, NumInits); 1694 Init = Seq.Perform(*this, Entity, Kind, MultiExprArg(Inits, NumInits)); 1695 if (Init.isInvalid()) { 1696 FD->setInvalidDecl(); 1697 return; 1698 } 1699 1700 CheckImplicitConversions(Init.get(), InitLoc); 1701 } 1702 1703 // C++0x [class.base.init]p7: 1704 // The initialization of each base and member constitutes a 1705 // full-expression. 1706 Init = MaybeCreateExprWithCleanups(Init); 1707 if (Init.isInvalid()) { 1708 FD->setInvalidDecl(); 1709 return; 1710 } 1711 1712 InitExpr = Init.release(); 1713 1714 FD->setInClassInitializer(InitExpr); 1715} 1716 1717/// \brief Find the direct and/or virtual base specifiers that 1718/// correspond to the given base type, for use in base initialization 1719/// within a constructor. 1720static bool FindBaseInitializer(Sema &SemaRef, 1721 CXXRecordDecl *ClassDecl, 1722 QualType BaseType, 1723 const CXXBaseSpecifier *&DirectBaseSpec, 1724 const CXXBaseSpecifier *&VirtualBaseSpec) { 1725 // First, check for a direct base class. 1726 DirectBaseSpec = 0; 1727 for (CXXRecordDecl::base_class_const_iterator Base 1728 = ClassDecl->bases_begin(); 1729 Base != ClassDecl->bases_end(); ++Base) { 1730 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 1731 // We found a direct base of this type. That's what we're 1732 // initializing. 1733 DirectBaseSpec = &*Base; 1734 break; 1735 } 1736 } 1737 1738 // Check for a virtual base class. 1739 // FIXME: We might be able to short-circuit this if we know in advance that 1740 // there are no virtual bases. 1741 VirtualBaseSpec = 0; 1742 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 1743 // We haven't found a base yet; search the class hierarchy for a 1744 // virtual base class. 1745 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1746 /*DetectVirtual=*/false); 1747 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 1748 BaseType, Paths)) { 1749 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1750 Path != Paths.end(); ++Path) { 1751 if (Path->back().Base->isVirtual()) { 1752 VirtualBaseSpec = Path->back().Base; 1753 break; 1754 } 1755 } 1756 } 1757 } 1758 1759 return DirectBaseSpec || VirtualBaseSpec; 1760} 1761 1762/// \brief Handle a C++ member initializer using braced-init-list syntax. 1763MemInitResult 1764Sema::ActOnMemInitializer(Decl *ConstructorD, 1765 Scope *S, 1766 CXXScopeSpec &SS, 1767 IdentifierInfo *MemberOrBase, 1768 ParsedType TemplateTypeTy, 1769 const DeclSpec &DS, 1770 SourceLocation IdLoc, 1771 Expr *InitList, 1772 SourceLocation EllipsisLoc) { 1773 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy, 1774 DS, IdLoc, InitList, 1775 EllipsisLoc); 1776} 1777 1778/// \brief Handle a C++ member initializer using parentheses syntax. 1779MemInitResult 1780Sema::ActOnMemInitializer(Decl *ConstructorD, 1781 Scope *S, 1782 CXXScopeSpec &SS, 1783 IdentifierInfo *MemberOrBase, 1784 ParsedType TemplateTypeTy, 1785 const DeclSpec &DS, 1786 SourceLocation IdLoc, 1787 SourceLocation LParenLoc, 1788 Expr **Args, unsigned NumArgs, 1789 SourceLocation RParenLoc, 1790 SourceLocation EllipsisLoc) { 1791 Expr *List = new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1792 RParenLoc); 1793 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy, 1794 DS, IdLoc, List, EllipsisLoc); 1795} 1796 1797namespace { 1798 1799// Callback to only accept typo corrections that can be a valid C++ member 1800// intializer: either a non-static field member or a base class. 1801class MemInitializerValidatorCCC : public CorrectionCandidateCallback { 1802 public: 1803 explicit MemInitializerValidatorCCC(CXXRecordDecl *ClassDecl) 1804 : ClassDecl(ClassDecl) {} 1805 1806 virtual bool ValidateCandidate(const TypoCorrection &candidate) { 1807 if (NamedDecl *ND = candidate.getCorrectionDecl()) { 1808 if (FieldDecl *Member = dyn_cast<FieldDecl>(ND)) 1809 return Member->getDeclContext()->getRedeclContext()->Equals(ClassDecl); 1810 else 1811 return isa<TypeDecl>(ND); 1812 } 1813 return false; 1814 } 1815 1816 private: 1817 CXXRecordDecl *ClassDecl; 1818}; 1819 1820} 1821 1822/// \brief Handle a C++ member initializer. 1823MemInitResult 1824Sema::BuildMemInitializer(Decl *ConstructorD, 1825 Scope *S, 1826 CXXScopeSpec &SS, 1827 IdentifierInfo *MemberOrBase, 1828 ParsedType TemplateTypeTy, 1829 const DeclSpec &DS, 1830 SourceLocation IdLoc, 1831 Expr *Init, 1832 SourceLocation EllipsisLoc) { 1833 if (!ConstructorD) 1834 return true; 1835 1836 AdjustDeclIfTemplate(ConstructorD); 1837 1838 CXXConstructorDecl *Constructor 1839 = dyn_cast<CXXConstructorDecl>(ConstructorD); 1840 if (!Constructor) { 1841 // The user wrote a constructor initializer on a function that is 1842 // not a C++ constructor. Ignore the error for now, because we may 1843 // have more member initializers coming; we'll diagnose it just 1844 // once in ActOnMemInitializers. 1845 return true; 1846 } 1847 1848 CXXRecordDecl *ClassDecl = Constructor->getParent(); 1849 1850 // C++ [class.base.init]p2: 1851 // Names in a mem-initializer-id are looked up in the scope of the 1852 // constructor's class and, if not found in that scope, are looked 1853 // up in the scope containing the constructor's definition. 1854 // [Note: if the constructor's class contains a member with the 1855 // same name as a direct or virtual base class of the class, a 1856 // mem-initializer-id naming the member or base class and composed 1857 // of a single identifier refers to the class member. A 1858 // mem-initializer-id for the hidden base class may be specified 1859 // using a qualified name. ] 1860 if (!SS.getScopeRep() && !TemplateTypeTy) { 1861 // Look for a member, first. 1862 DeclContext::lookup_result Result 1863 = ClassDecl->lookup(MemberOrBase); 1864 if (Result.first != Result.second) { 1865 ValueDecl *Member; 1866 if ((Member = dyn_cast<FieldDecl>(*Result.first)) || 1867 (Member = dyn_cast<IndirectFieldDecl>(*Result.first))) { 1868 if (EllipsisLoc.isValid()) 1869 Diag(EllipsisLoc, diag::err_pack_expansion_member_init) 1870 << MemberOrBase 1871 << SourceRange(IdLoc, Init->getSourceRange().getEnd()); 1872 1873 return BuildMemberInitializer(Member, Init, IdLoc); 1874 } 1875 } 1876 } 1877 // It didn't name a member, so see if it names a class. 1878 QualType BaseType; 1879 TypeSourceInfo *TInfo = 0; 1880 1881 if (TemplateTypeTy) { 1882 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 1883 } else if (DS.getTypeSpecType() == TST_decltype) { 1884 BaseType = BuildDecltypeType(DS.getRepAsExpr(), DS.getTypeSpecTypeLoc()); 1885 } else { 1886 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 1887 LookupParsedName(R, S, &SS); 1888 1889 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 1890 if (!TyD) { 1891 if (R.isAmbiguous()) return true; 1892 1893 // We don't want access-control diagnostics here. 1894 R.suppressDiagnostics(); 1895 1896 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 1897 bool NotUnknownSpecialization = false; 1898 DeclContext *DC = computeDeclContext(SS, false); 1899 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 1900 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 1901 1902 if (!NotUnknownSpecialization) { 1903 // When the scope specifier can refer to a member of an unknown 1904 // specialization, we take it as a type name. 1905 BaseType = CheckTypenameType(ETK_None, SourceLocation(), 1906 SS.getWithLocInContext(Context), 1907 *MemberOrBase, IdLoc); 1908 if (BaseType.isNull()) 1909 return true; 1910 1911 R.clear(); 1912 R.setLookupName(MemberOrBase); 1913 } 1914 } 1915 1916 // If no results were found, try to correct typos. 1917 TypoCorrection Corr; 1918 MemInitializerValidatorCCC Validator(ClassDecl); 1919 if (R.empty() && BaseType.isNull() && 1920 (Corr = CorrectTypo(R.getLookupNameInfo(), R.getLookupKind(), S, &SS, 1921 Validator, ClassDecl))) { 1922 std::string CorrectedStr(Corr.getAsString(getLangOpts())); 1923 std::string CorrectedQuotedStr(Corr.getQuoted(getLangOpts())); 1924 if (FieldDecl *Member = Corr.getCorrectionDeclAs<FieldDecl>()) { 1925 // We have found a non-static data member with a similar 1926 // name to what was typed; complain and initialize that 1927 // member. 1928 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1929 << MemberOrBase << true << CorrectedQuotedStr 1930 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr); 1931 Diag(Member->getLocation(), diag::note_previous_decl) 1932 << CorrectedQuotedStr; 1933 1934 return BuildMemberInitializer(Member, Init, IdLoc); 1935 } else if (TypeDecl *Type = Corr.getCorrectionDeclAs<TypeDecl>()) { 1936 const CXXBaseSpecifier *DirectBaseSpec; 1937 const CXXBaseSpecifier *VirtualBaseSpec; 1938 if (FindBaseInitializer(*this, ClassDecl, 1939 Context.getTypeDeclType(Type), 1940 DirectBaseSpec, VirtualBaseSpec)) { 1941 // We have found a direct or virtual base class with a 1942 // similar name to what was typed; complain and initialize 1943 // that base class. 1944 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1945 << MemberOrBase << false << CorrectedQuotedStr 1946 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr); 1947 1948 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 1949 : VirtualBaseSpec; 1950 Diag(BaseSpec->getLocStart(), 1951 diag::note_base_class_specified_here) 1952 << BaseSpec->getType() 1953 << BaseSpec->getSourceRange(); 1954 1955 TyD = Type; 1956 } 1957 } 1958 } 1959 1960 if (!TyD && BaseType.isNull()) { 1961 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1962 << MemberOrBase << SourceRange(IdLoc,Init->getSourceRange().getEnd()); 1963 return true; 1964 } 1965 } 1966 1967 if (BaseType.isNull()) { 1968 BaseType = Context.getTypeDeclType(TyD); 1969 if (SS.isSet()) { 1970 NestedNameSpecifier *Qualifier = 1971 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1972 1973 // FIXME: preserve source range information 1974 BaseType = Context.getElaboratedType(ETK_None, Qualifier, BaseType); 1975 } 1976 } 1977 } 1978 1979 if (!TInfo) 1980 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 1981 1982 return BuildBaseInitializer(BaseType, TInfo, Init, ClassDecl, EllipsisLoc); 1983} 1984 1985/// Checks a member initializer expression for cases where reference (or 1986/// pointer) members are bound to by-value parameters (or their addresses). 1987static void CheckForDanglingReferenceOrPointer(Sema &S, ValueDecl *Member, 1988 Expr *Init, 1989 SourceLocation IdLoc) { 1990 QualType MemberTy = Member->getType(); 1991 1992 // We only handle pointers and references currently. 1993 // FIXME: Would this be relevant for ObjC object pointers? Or block pointers? 1994 if (!MemberTy->isReferenceType() && !MemberTy->isPointerType()) 1995 return; 1996 1997 const bool IsPointer = MemberTy->isPointerType(); 1998 if (IsPointer) { 1999 if (const UnaryOperator *Op 2000 = dyn_cast<UnaryOperator>(Init->IgnoreParenImpCasts())) { 2001 // The only case we're worried about with pointers requires taking the 2002 // address. 2003 if (Op->getOpcode() != UO_AddrOf) 2004 return; 2005 2006 Init = Op->getSubExpr(); 2007 } else { 2008 // We only handle address-of expression initializers for pointers. 2009 return; 2010 } 2011 } 2012 2013 if (isa<MaterializeTemporaryExpr>(Init->IgnoreParens())) { 2014 // Taking the address of a temporary will be diagnosed as a hard error. 2015 if (IsPointer) 2016 return; 2017 2018 S.Diag(Init->getExprLoc(), diag::warn_bind_ref_member_to_temporary) 2019 << Member << Init->getSourceRange(); 2020 } else if (const DeclRefExpr *DRE 2021 = dyn_cast<DeclRefExpr>(Init->IgnoreParens())) { 2022 // We only warn when referring to a non-reference parameter declaration. 2023 const ParmVarDecl *Parameter = dyn_cast<ParmVarDecl>(DRE->getDecl()); 2024 if (!Parameter || Parameter->getType()->isReferenceType()) 2025 return; 2026 2027 S.Diag(Init->getExprLoc(), 2028 IsPointer ? diag::warn_init_ptr_member_to_parameter_addr 2029 : diag::warn_bind_ref_member_to_parameter) 2030 << Member << Parameter << Init->getSourceRange(); 2031 } else { 2032 // Other initializers are fine. 2033 return; 2034 } 2035 2036 S.Diag(Member->getLocation(), diag::note_ref_or_ptr_member_declared_here) 2037 << (unsigned)IsPointer; 2038} 2039 2040/// Checks an initializer expression for use of uninitialized fields, such as 2041/// containing the field that is being initialized. Returns true if there is an 2042/// uninitialized field was used an updates the SourceLocation parameter; false 2043/// otherwise. 2044static bool InitExprContainsUninitializedFields(const Stmt *S, 2045 const ValueDecl *LhsField, 2046 SourceLocation *L) { 2047 assert(isa<FieldDecl>(LhsField) || isa<IndirectFieldDecl>(LhsField)); 2048 2049 if (isa<CallExpr>(S)) { 2050 // Do not descend into function calls or constructors, as the use 2051 // of an uninitialized field may be valid. One would have to inspect 2052 // the contents of the function/ctor to determine if it is safe or not. 2053 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 2054 // may be safe, depending on what the function/ctor does. 2055 return false; 2056 } 2057 if (const MemberExpr *ME = dyn_cast<MemberExpr>(S)) { 2058 const NamedDecl *RhsField = ME->getMemberDecl(); 2059 2060 if (const VarDecl *VD = dyn_cast<VarDecl>(RhsField)) { 2061 // The member expression points to a static data member. 2062 assert(VD->isStaticDataMember() && 2063 "Member points to non-static data member!"); 2064 (void)VD; 2065 return false; 2066 } 2067 2068 if (isa<EnumConstantDecl>(RhsField)) { 2069 // The member expression points to an enum. 2070 return false; 2071 } 2072 2073 if (RhsField == LhsField) { 2074 // Initializing a field with itself. Throw a warning. 2075 // But wait; there are exceptions! 2076 // Exception #1: The field may not belong to this record. 2077 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 2078 const Expr *base = ME->getBase(); 2079 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 2080 // Even though the field matches, it does not belong to this record. 2081 return false; 2082 } 2083 // None of the exceptions triggered; return true to indicate an 2084 // uninitialized field was used. 2085 *L = ME->getMemberLoc(); 2086 return true; 2087 } 2088 } else if (isa<UnaryExprOrTypeTraitExpr>(S)) { 2089 // sizeof/alignof doesn't reference contents, do not warn. 2090 return false; 2091 } else if (const UnaryOperator *UOE = dyn_cast<UnaryOperator>(S)) { 2092 // address-of doesn't reference contents (the pointer may be dereferenced 2093 // in the same expression but it would be rare; and weird). 2094 if (UOE->getOpcode() == UO_AddrOf) 2095 return false; 2096 } 2097 for (Stmt::const_child_range it = S->children(); it; ++it) { 2098 if (!*it) { 2099 // An expression such as 'member(arg ?: "")' may trigger this. 2100 continue; 2101 } 2102 if (InitExprContainsUninitializedFields(*it, LhsField, L)) 2103 return true; 2104 } 2105 return false; 2106} 2107 2108MemInitResult 2109Sema::BuildMemberInitializer(ValueDecl *Member, Expr *Init, 2110 SourceLocation IdLoc) { 2111 FieldDecl *DirectMember = dyn_cast<FieldDecl>(Member); 2112 IndirectFieldDecl *IndirectMember = dyn_cast<IndirectFieldDecl>(Member); 2113 assert((DirectMember || IndirectMember) && 2114 "Member must be a FieldDecl or IndirectFieldDecl"); 2115 2116 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) 2117 return true; 2118 2119 if (Member->isInvalidDecl()) 2120 return true; 2121 2122 // Diagnose value-uses of fields to initialize themselves, e.g. 2123 // foo(foo) 2124 // where foo is not also a parameter to the constructor. 2125 // TODO: implement -Wuninitialized and fold this into that framework. 2126 Expr **Args; 2127 unsigned NumArgs; 2128 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { 2129 Args = ParenList->getExprs(); 2130 NumArgs = ParenList->getNumExprs(); 2131 } else { 2132 InitListExpr *InitList = cast<InitListExpr>(Init); 2133 Args = InitList->getInits(); 2134 NumArgs = InitList->getNumInits(); 2135 } 2136 2137 // Mark FieldDecl as being used if it is a non-primitive type and the 2138 // initializer does not call the default constructor (which is trivial 2139 // for all entries in UnusedPrivateFields). 2140 // FIXME: Make this smarter once more side effect-free types can be 2141 // determined. 2142 if (NumArgs > 0) { 2143 if (Member->getType()->isRecordType()) { 2144 UnusedPrivateFields.remove(Member); 2145 } else { 2146 for (unsigned i = 0; i < NumArgs; ++i) { 2147 if (Args[i]->HasSideEffects(Context)) { 2148 UnusedPrivateFields.remove(Member); 2149 break; 2150 } 2151 } 2152 } 2153 } 2154 2155 for (unsigned i = 0; i < NumArgs; ++i) { 2156 SourceLocation L; 2157 if (InitExprContainsUninitializedFields(Args[i], Member, &L)) { 2158 // FIXME: Return true in the case when other fields are used before being 2159 // uninitialized. For example, let this field be the i'th field. When 2160 // initializing the i'th field, throw a warning if any of the >= i'th 2161 // fields are used, as they are not yet initialized. 2162 // Right now we are only handling the case where the i'th field uses 2163 // itself in its initializer. 2164 Diag(L, diag::warn_field_is_uninit); 2165 } 2166 } 2167 2168 SourceRange InitRange = Init->getSourceRange(); 2169 2170 if (Member->getType()->isDependentType() || Init->isTypeDependent()) { 2171 // Can't check initialization for a member of dependent type or when 2172 // any of the arguments are type-dependent expressions. 2173 DiscardCleanupsInEvaluationContext(); 2174 } else { 2175 bool InitList = false; 2176 if (isa<InitListExpr>(Init)) { 2177 InitList = true; 2178 Args = &Init; 2179 NumArgs = 1; 2180 2181 if (isStdInitializerList(Member->getType(), 0)) { 2182 Diag(IdLoc, diag::warn_dangling_std_initializer_list) 2183 << /*at end of ctor*/1 << InitRange; 2184 } 2185 } 2186 2187 // Initialize the member. 2188 InitializedEntity MemberEntity = 2189 DirectMember ? InitializedEntity::InitializeMember(DirectMember, 0) 2190 : InitializedEntity::InitializeMember(IndirectMember, 0); 2191 InitializationKind Kind = 2192 InitList ? InitializationKind::CreateDirectList(IdLoc) 2193 : InitializationKind::CreateDirect(IdLoc, InitRange.getBegin(), 2194 InitRange.getEnd()); 2195 2196 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args, NumArgs); 2197 ExprResult MemberInit = InitSeq.Perform(*this, MemberEntity, Kind, 2198 MultiExprArg(*this, Args, NumArgs), 2199 0); 2200 if (MemberInit.isInvalid()) 2201 return true; 2202 2203 CheckImplicitConversions(MemberInit.get(), 2204 InitRange.getBegin()); 2205 2206 // C++0x [class.base.init]p7: 2207 // The initialization of each base and member constitutes a 2208 // full-expression. 2209 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 2210 if (MemberInit.isInvalid()) 2211 return true; 2212 2213 // If we are in a dependent context, template instantiation will 2214 // perform this type-checking again. Just save the arguments that we 2215 // received. 2216 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2217 // of the information that we have about the member 2218 // initializer. However, deconstructing the ASTs is a dicey process, 2219 // and this approach is far more likely to get the corner cases right. 2220 if (CurContext->isDependentContext()) { 2221 // The existing Init will do fine. 2222 } else { 2223 Init = MemberInit.get(); 2224 CheckForDanglingReferenceOrPointer(*this, Member, Init, IdLoc); 2225 } 2226 } 2227 2228 if (DirectMember) { 2229 return new (Context) CXXCtorInitializer(Context, DirectMember, IdLoc, 2230 InitRange.getBegin(), Init, 2231 InitRange.getEnd()); 2232 } else { 2233 return new (Context) CXXCtorInitializer(Context, IndirectMember, IdLoc, 2234 InitRange.getBegin(), Init, 2235 InitRange.getEnd()); 2236 } 2237} 2238 2239MemInitResult 2240Sema::BuildDelegatingInitializer(TypeSourceInfo *TInfo, Expr *Init, 2241 CXXRecordDecl *ClassDecl) { 2242 SourceLocation NameLoc = TInfo->getTypeLoc().getLocalSourceRange().getBegin(); 2243 if (!LangOpts.CPlusPlus0x) 2244 return Diag(NameLoc, diag::err_delegating_ctor) 2245 << TInfo->getTypeLoc().getLocalSourceRange(); 2246 Diag(NameLoc, diag::warn_cxx98_compat_delegating_ctor); 2247 2248 bool InitList = true; 2249 Expr **Args = &Init; 2250 unsigned NumArgs = 1; 2251 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { 2252 InitList = false; 2253 Args = ParenList->getExprs(); 2254 NumArgs = ParenList->getNumExprs(); 2255 } 2256 2257 SourceRange InitRange = Init->getSourceRange(); 2258 // Initialize the object. 2259 InitializedEntity DelegationEntity = InitializedEntity::InitializeDelegation( 2260 QualType(ClassDecl->getTypeForDecl(), 0)); 2261 InitializationKind Kind = 2262 InitList ? InitializationKind::CreateDirectList(NameLoc) 2263 : InitializationKind::CreateDirect(NameLoc, InitRange.getBegin(), 2264 InitRange.getEnd()); 2265 InitializationSequence InitSeq(*this, DelegationEntity, Kind, Args, NumArgs); 2266 ExprResult DelegationInit = InitSeq.Perform(*this, DelegationEntity, Kind, 2267 MultiExprArg(*this, Args,NumArgs), 2268 0); 2269 if (DelegationInit.isInvalid()) 2270 return true; 2271 2272 assert(cast<CXXConstructExpr>(DelegationInit.get())->getConstructor() && 2273 "Delegating constructor with no target?"); 2274 2275 CheckImplicitConversions(DelegationInit.get(), InitRange.getBegin()); 2276 2277 // C++0x [class.base.init]p7: 2278 // The initialization of each base and member constitutes a 2279 // full-expression. 2280 DelegationInit = MaybeCreateExprWithCleanups(DelegationInit); 2281 if (DelegationInit.isInvalid()) 2282 return true; 2283 2284 // If we are in a dependent context, template instantiation will 2285 // perform this type-checking again. Just save the arguments that we 2286 // received in a ParenListExpr. 2287 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2288 // of the information that we have about the base 2289 // initializer. However, deconstructing the ASTs is a dicey process, 2290 // and this approach is far more likely to get the corner cases right. 2291 if (CurContext->isDependentContext()) 2292 DelegationInit = Owned(Init); 2293 2294 return new (Context) CXXCtorInitializer(Context, TInfo, InitRange.getBegin(), 2295 DelegationInit.takeAs<Expr>(), 2296 InitRange.getEnd()); 2297} 2298 2299MemInitResult 2300Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 2301 Expr *Init, CXXRecordDecl *ClassDecl, 2302 SourceLocation EllipsisLoc) { 2303 SourceLocation BaseLoc 2304 = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); 2305 2306 if (!BaseType->isDependentType() && !BaseType->isRecordType()) 2307 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 2308 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2309 2310 // C++ [class.base.init]p2: 2311 // [...] Unless the mem-initializer-id names a nonstatic data 2312 // member of the constructor's class or a direct or virtual base 2313 // of that class, the mem-initializer is ill-formed. A 2314 // mem-initializer-list can initialize a base class using any 2315 // name that denotes that base class type. 2316 bool Dependent = BaseType->isDependentType() || Init->isTypeDependent(); 2317 2318 SourceRange InitRange = Init->getSourceRange(); 2319 if (EllipsisLoc.isValid()) { 2320 // This is a pack expansion. 2321 if (!BaseType->containsUnexpandedParameterPack()) { 2322 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 2323 << SourceRange(BaseLoc, InitRange.getEnd()); 2324 2325 EllipsisLoc = SourceLocation(); 2326 } 2327 } else { 2328 // Check for any unexpanded parameter packs. 2329 if (DiagnoseUnexpandedParameterPack(BaseLoc, BaseTInfo, UPPC_Initializer)) 2330 return true; 2331 2332 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) 2333 return true; 2334 } 2335 2336 // Check for direct and virtual base classes. 2337 const CXXBaseSpecifier *DirectBaseSpec = 0; 2338 const CXXBaseSpecifier *VirtualBaseSpec = 0; 2339 if (!Dependent) { 2340 if (Context.hasSameUnqualifiedType(QualType(ClassDecl->getTypeForDecl(),0), 2341 BaseType)) 2342 return BuildDelegatingInitializer(BaseTInfo, Init, ClassDecl); 2343 2344 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 2345 VirtualBaseSpec); 2346 2347 // C++ [base.class.init]p2: 2348 // Unless the mem-initializer-id names a nonstatic data member of the 2349 // constructor's class or a direct or virtual base of that class, the 2350 // mem-initializer is ill-formed. 2351 if (!DirectBaseSpec && !VirtualBaseSpec) { 2352 // If the class has any dependent bases, then it's possible that 2353 // one of those types will resolve to the same type as 2354 // BaseType. Therefore, just treat this as a dependent base 2355 // class initialization. FIXME: Should we try to check the 2356 // initialization anyway? It seems odd. 2357 if (ClassDecl->hasAnyDependentBases()) 2358 Dependent = true; 2359 else 2360 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 2361 << BaseType << Context.getTypeDeclType(ClassDecl) 2362 << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2363 } 2364 } 2365 2366 if (Dependent) { 2367 DiscardCleanupsInEvaluationContext(); 2368 2369 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 2370 /*IsVirtual=*/false, 2371 InitRange.getBegin(), Init, 2372 InitRange.getEnd(), EllipsisLoc); 2373 } 2374 2375 // C++ [base.class.init]p2: 2376 // If a mem-initializer-id is ambiguous because it designates both 2377 // a direct non-virtual base class and an inherited virtual base 2378 // class, the mem-initializer is ill-formed. 2379 if (DirectBaseSpec && VirtualBaseSpec) 2380 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 2381 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2382 2383 CXXBaseSpecifier *BaseSpec = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 2384 if (!BaseSpec) 2385 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 2386 2387 // Initialize the base. 2388 bool InitList = true; 2389 Expr **Args = &Init; 2390 unsigned NumArgs = 1; 2391 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { 2392 InitList = false; 2393 Args = ParenList->getExprs(); 2394 NumArgs = ParenList->getNumExprs(); 2395 } 2396 2397 InitializedEntity BaseEntity = 2398 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 2399 InitializationKind Kind = 2400 InitList ? InitializationKind::CreateDirectList(BaseLoc) 2401 : InitializationKind::CreateDirect(BaseLoc, InitRange.getBegin(), 2402 InitRange.getEnd()); 2403 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args, NumArgs); 2404 ExprResult BaseInit = InitSeq.Perform(*this, BaseEntity, Kind, 2405 MultiExprArg(*this, Args, NumArgs), 2406 0); 2407 if (BaseInit.isInvalid()) 2408 return true; 2409 2410 CheckImplicitConversions(BaseInit.get(), InitRange.getBegin()); 2411 2412 // C++0x [class.base.init]p7: 2413 // The initialization of each base and member constitutes a 2414 // full-expression. 2415 BaseInit = MaybeCreateExprWithCleanups(BaseInit); 2416 if (BaseInit.isInvalid()) 2417 return true; 2418 2419 // If we are in a dependent context, template instantiation will 2420 // perform this type-checking again. Just save the arguments that we 2421 // received in a ParenListExpr. 2422 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2423 // of the information that we have about the base 2424 // initializer. However, deconstructing the ASTs is a dicey process, 2425 // and this approach is far more likely to get the corner cases right. 2426 if (CurContext->isDependentContext()) 2427 BaseInit = Owned(Init); 2428 2429 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 2430 BaseSpec->isVirtual(), 2431 InitRange.getBegin(), 2432 BaseInit.takeAs<Expr>(), 2433 InitRange.getEnd(), EllipsisLoc); 2434} 2435 2436// Create a static_cast\<T&&>(expr). 2437static Expr *CastForMoving(Sema &SemaRef, Expr *E) { 2438 QualType ExprType = E->getType(); 2439 QualType TargetType = SemaRef.Context.getRValueReferenceType(ExprType); 2440 SourceLocation ExprLoc = E->getLocStart(); 2441 TypeSourceInfo *TargetLoc = SemaRef.Context.getTrivialTypeSourceInfo( 2442 TargetType, ExprLoc); 2443 2444 return SemaRef.BuildCXXNamedCast(ExprLoc, tok::kw_static_cast, TargetLoc, E, 2445 SourceRange(ExprLoc, ExprLoc), 2446 E->getSourceRange()).take(); 2447} 2448 2449/// ImplicitInitializerKind - How an implicit base or member initializer should 2450/// initialize its base or member. 2451enum ImplicitInitializerKind { 2452 IIK_Default, 2453 IIK_Copy, 2454 IIK_Move 2455}; 2456 2457static bool 2458BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 2459 ImplicitInitializerKind ImplicitInitKind, 2460 CXXBaseSpecifier *BaseSpec, 2461 bool IsInheritedVirtualBase, 2462 CXXCtorInitializer *&CXXBaseInit) { 2463 InitializedEntity InitEntity 2464 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 2465 IsInheritedVirtualBase); 2466 2467 ExprResult BaseInit; 2468 2469 switch (ImplicitInitKind) { 2470 case IIK_Default: { 2471 InitializationKind InitKind 2472 = InitializationKind::CreateDefault(Constructor->getLocation()); 2473 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 2474 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 2475 MultiExprArg(SemaRef, 0, 0)); 2476 break; 2477 } 2478 2479 case IIK_Move: 2480 case IIK_Copy: { 2481 bool Moving = ImplicitInitKind == IIK_Move; 2482 ParmVarDecl *Param = Constructor->getParamDecl(0); 2483 QualType ParamType = Param->getType().getNonReferenceType(); 2484 2485 Expr *CopyCtorArg = 2486 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), 2487 SourceLocation(), Param, false, 2488 Constructor->getLocation(), ParamType, 2489 VK_LValue, 0); 2490 2491 SemaRef.MarkDeclRefReferenced(cast<DeclRefExpr>(CopyCtorArg)); 2492 2493 // Cast to the base class to avoid ambiguities. 2494 QualType ArgTy = 2495 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), 2496 ParamType.getQualifiers()); 2497 2498 if (Moving) { 2499 CopyCtorArg = CastForMoving(SemaRef, CopyCtorArg); 2500 } 2501 2502 CXXCastPath BasePath; 2503 BasePath.push_back(BaseSpec); 2504 CopyCtorArg = SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, 2505 CK_UncheckedDerivedToBase, 2506 Moving ? VK_XValue : VK_LValue, 2507 &BasePath).take(); 2508 2509 InitializationKind InitKind 2510 = InitializationKind::CreateDirect(Constructor->getLocation(), 2511 SourceLocation(), SourceLocation()); 2512 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 2513 &CopyCtorArg, 1); 2514 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 2515 MultiExprArg(&CopyCtorArg, 1)); 2516 break; 2517 } 2518 } 2519 2520 BaseInit = SemaRef.MaybeCreateExprWithCleanups(BaseInit); 2521 if (BaseInit.isInvalid()) 2522 return true; 2523 2524 CXXBaseInit = 2525 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2526 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 2527 SourceLocation()), 2528 BaseSpec->isVirtual(), 2529 SourceLocation(), 2530 BaseInit.takeAs<Expr>(), 2531 SourceLocation(), 2532 SourceLocation()); 2533 2534 return false; 2535} 2536 2537static bool RefersToRValueRef(Expr *MemRef) { 2538 ValueDecl *Referenced = cast<MemberExpr>(MemRef)->getMemberDecl(); 2539 return Referenced->getType()->isRValueReferenceType(); 2540} 2541 2542static bool 2543BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 2544 ImplicitInitializerKind ImplicitInitKind, 2545 FieldDecl *Field, IndirectFieldDecl *Indirect, 2546 CXXCtorInitializer *&CXXMemberInit) { 2547 if (Field->isInvalidDecl()) 2548 return true; 2549 2550 SourceLocation Loc = Constructor->getLocation(); 2551 2552 if (ImplicitInitKind == IIK_Copy || ImplicitInitKind == IIK_Move) { 2553 bool Moving = ImplicitInitKind == IIK_Move; 2554 ParmVarDecl *Param = Constructor->getParamDecl(0); 2555 QualType ParamType = Param->getType().getNonReferenceType(); 2556 2557 // Suppress copying zero-width bitfields. 2558 if (Field->isBitField() && Field->getBitWidthValue(SemaRef.Context) == 0) 2559 return false; 2560 2561 Expr *MemberExprBase = 2562 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), 2563 SourceLocation(), Param, false, 2564 Loc, ParamType, VK_LValue, 0); 2565 2566 SemaRef.MarkDeclRefReferenced(cast<DeclRefExpr>(MemberExprBase)); 2567 2568 if (Moving) { 2569 MemberExprBase = CastForMoving(SemaRef, MemberExprBase); 2570 } 2571 2572 // Build a reference to this field within the parameter. 2573 CXXScopeSpec SS; 2574 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, 2575 Sema::LookupMemberName); 2576 MemberLookup.addDecl(Indirect ? cast<ValueDecl>(Indirect) 2577 : cast<ValueDecl>(Field), AS_public); 2578 MemberLookup.resolveKind(); 2579 ExprResult CtorArg 2580 = SemaRef.BuildMemberReferenceExpr(MemberExprBase, 2581 ParamType, Loc, 2582 /*IsArrow=*/false, 2583 SS, 2584 /*TemplateKWLoc=*/SourceLocation(), 2585 /*FirstQualifierInScope=*/0, 2586 MemberLookup, 2587 /*TemplateArgs=*/0); 2588 if (CtorArg.isInvalid()) 2589 return true; 2590 2591 // C++11 [class.copy]p15: 2592 // - if a member m has rvalue reference type T&&, it is direct-initialized 2593 // with static_cast<T&&>(x.m); 2594 if (RefersToRValueRef(CtorArg.get())) { 2595 CtorArg = CastForMoving(SemaRef, CtorArg.take()); 2596 } 2597 2598 // When the field we are copying is an array, create index variables for 2599 // each dimension of the array. We use these index variables to subscript 2600 // the source array, and other clients (e.g., CodeGen) will perform the 2601 // necessary iteration with these index variables. 2602 SmallVector<VarDecl *, 4> IndexVariables; 2603 QualType BaseType = Field->getType(); 2604 QualType SizeType = SemaRef.Context.getSizeType(); 2605 bool InitializingArray = false; 2606 while (const ConstantArrayType *Array 2607 = SemaRef.Context.getAsConstantArrayType(BaseType)) { 2608 InitializingArray = true; 2609 // Create the iteration variable for this array index. 2610 IdentifierInfo *IterationVarName = 0; 2611 { 2612 SmallString<8> Str; 2613 llvm::raw_svector_ostream OS(Str); 2614 OS << "__i" << IndexVariables.size(); 2615 IterationVarName = &SemaRef.Context.Idents.get(OS.str()); 2616 } 2617 VarDecl *IterationVar 2618 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, Loc, 2619 IterationVarName, SizeType, 2620 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc), 2621 SC_None, SC_None); 2622 IndexVariables.push_back(IterationVar); 2623 2624 // Create a reference to the iteration variable. 2625 ExprResult IterationVarRef 2626 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, VK_LValue, Loc); 2627 assert(!IterationVarRef.isInvalid() && 2628 "Reference to invented variable cannot fail!"); 2629 IterationVarRef = SemaRef.DefaultLvalueConversion(IterationVarRef.take()); 2630 assert(!IterationVarRef.isInvalid() && 2631 "Conversion of invented variable cannot fail!"); 2632 2633 // Subscript the array with this iteration variable. 2634 CtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(CtorArg.take(), Loc, 2635 IterationVarRef.take(), 2636 Loc); 2637 if (CtorArg.isInvalid()) 2638 return true; 2639 2640 BaseType = Array->getElementType(); 2641 } 2642 2643 // The array subscript expression is an lvalue, which is wrong for moving. 2644 if (Moving && InitializingArray) 2645 CtorArg = CastForMoving(SemaRef, CtorArg.take()); 2646 2647 // Construct the entity that we will be initializing. For an array, this 2648 // will be first element in the array, which may require several levels 2649 // of array-subscript entities. 2650 SmallVector<InitializedEntity, 4> Entities; 2651 Entities.reserve(1 + IndexVariables.size()); 2652 if (Indirect) 2653 Entities.push_back(InitializedEntity::InitializeMember(Indirect)); 2654 else 2655 Entities.push_back(InitializedEntity::InitializeMember(Field)); 2656 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I) 2657 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context, 2658 0, 2659 Entities.back())); 2660 2661 // Direct-initialize to use the copy constructor. 2662 InitializationKind InitKind = 2663 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); 2664 2665 Expr *CtorArgE = CtorArg.takeAs<Expr>(); 2666 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, 2667 &CtorArgE, 1); 2668 2669 ExprResult MemberInit 2670 = InitSeq.Perform(SemaRef, Entities.back(), InitKind, 2671 MultiExprArg(&CtorArgE, 1)); 2672 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2673 if (MemberInit.isInvalid()) 2674 return true; 2675 2676 if (Indirect) { 2677 assert(IndexVariables.size() == 0 && 2678 "Indirect field improperly initialized"); 2679 CXXMemberInit 2680 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 2681 Loc, Loc, 2682 MemberInit.takeAs<Expr>(), 2683 Loc); 2684 } else 2685 CXXMemberInit = CXXCtorInitializer::Create(SemaRef.Context, Field, Loc, 2686 Loc, MemberInit.takeAs<Expr>(), 2687 Loc, 2688 IndexVariables.data(), 2689 IndexVariables.size()); 2690 return false; 2691 } 2692 2693 assert(ImplicitInitKind == IIK_Default && "Unhandled implicit init kind!"); 2694 2695 QualType FieldBaseElementType = 2696 SemaRef.Context.getBaseElementType(Field->getType()); 2697 2698 if (FieldBaseElementType->isRecordType()) { 2699 InitializedEntity InitEntity 2700 = Indirect? InitializedEntity::InitializeMember(Indirect) 2701 : InitializedEntity::InitializeMember(Field); 2702 InitializationKind InitKind = 2703 InitializationKind::CreateDefault(Loc); 2704 2705 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 2706 ExprResult MemberInit = 2707 InitSeq.Perform(SemaRef, InitEntity, InitKind, MultiExprArg()); 2708 2709 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2710 if (MemberInit.isInvalid()) 2711 return true; 2712 2713 if (Indirect) 2714 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2715 Indirect, Loc, 2716 Loc, 2717 MemberInit.get(), 2718 Loc); 2719 else 2720 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2721 Field, Loc, Loc, 2722 MemberInit.get(), 2723 Loc); 2724 return false; 2725 } 2726 2727 if (!Field->getParent()->isUnion()) { 2728 if (FieldBaseElementType->isReferenceType()) { 2729 SemaRef.Diag(Constructor->getLocation(), 2730 diag::err_uninitialized_member_in_ctor) 2731 << (int)Constructor->isImplicit() 2732 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2733 << 0 << Field->getDeclName(); 2734 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2735 return true; 2736 } 2737 2738 if (FieldBaseElementType.isConstQualified()) { 2739 SemaRef.Diag(Constructor->getLocation(), 2740 diag::err_uninitialized_member_in_ctor) 2741 << (int)Constructor->isImplicit() 2742 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2743 << 1 << Field->getDeclName(); 2744 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2745 return true; 2746 } 2747 } 2748 2749 if (SemaRef.getLangOpts().ObjCAutoRefCount && 2750 FieldBaseElementType->isObjCRetainableType() && 2751 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_None && 2752 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_ExplicitNone) { 2753 // Instant objects: 2754 // Default-initialize Objective-C pointers to NULL. 2755 CXXMemberInit 2756 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 2757 Loc, Loc, 2758 new (SemaRef.Context) ImplicitValueInitExpr(Field->getType()), 2759 Loc); 2760 return false; 2761 } 2762 2763 // Nothing to initialize. 2764 CXXMemberInit = 0; 2765 return false; 2766} 2767 2768namespace { 2769struct BaseAndFieldInfo { 2770 Sema &S; 2771 CXXConstructorDecl *Ctor; 2772 bool AnyErrorsInInits; 2773 ImplicitInitializerKind IIK; 2774 llvm::DenseMap<const void *, CXXCtorInitializer*> AllBaseFields; 2775 SmallVector<CXXCtorInitializer*, 8> AllToInit; 2776 2777 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) 2778 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { 2779 bool Generated = Ctor->isImplicit() || Ctor->isDefaulted(); 2780 if (Generated && Ctor->isCopyConstructor()) 2781 IIK = IIK_Copy; 2782 else if (Generated && Ctor->isMoveConstructor()) 2783 IIK = IIK_Move; 2784 else 2785 IIK = IIK_Default; 2786 } 2787 2788 bool isImplicitCopyOrMove() const { 2789 switch (IIK) { 2790 case IIK_Copy: 2791 case IIK_Move: 2792 return true; 2793 2794 case IIK_Default: 2795 return false; 2796 } 2797 2798 llvm_unreachable("Invalid ImplicitInitializerKind!"); 2799 } 2800}; 2801} 2802 2803/// \brief Determine whether the given indirect field declaration is somewhere 2804/// within an anonymous union. 2805static bool isWithinAnonymousUnion(IndirectFieldDecl *F) { 2806 for (IndirectFieldDecl::chain_iterator C = F->chain_begin(), 2807 CEnd = F->chain_end(); 2808 C != CEnd; ++C) 2809 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>((*C)->getDeclContext())) 2810 if (Record->isUnion()) 2811 return true; 2812 2813 return false; 2814} 2815 2816/// \brief Determine whether the given type is an incomplete or zero-lenfgth 2817/// array type. 2818static bool isIncompleteOrZeroLengthArrayType(ASTContext &Context, QualType T) { 2819 if (T->isIncompleteArrayType()) 2820 return true; 2821 2822 while (const ConstantArrayType *ArrayT = Context.getAsConstantArrayType(T)) { 2823 if (!ArrayT->getSize()) 2824 return true; 2825 2826 T = ArrayT->getElementType(); 2827 } 2828 2829 return false; 2830} 2831 2832static bool CollectFieldInitializer(Sema &SemaRef, BaseAndFieldInfo &Info, 2833 FieldDecl *Field, 2834 IndirectFieldDecl *Indirect = 0) { 2835 2836 // Overwhelmingly common case: we have a direct initializer for this field. 2837 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(Field)) { 2838 Info.AllToInit.push_back(Init); 2839 return false; 2840 } 2841 2842 // C++0x [class.base.init]p8: if the entity is a non-static data member that 2843 // has a brace-or-equal-initializer, the entity is initialized as specified 2844 // in [dcl.init]. 2845 if (Field->hasInClassInitializer() && !Info.isImplicitCopyOrMove()) { 2846 CXXCtorInitializer *Init; 2847 if (Indirect) 2848 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 2849 SourceLocation(), 2850 SourceLocation(), 0, 2851 SourceLocation()); 2852 else 2853 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 2854 SourceLocation(), 2855 SourceLocation(), 0, 2856 SourceLocation()); 2857 Info.AllToInit.push_back(Init); 2858 2859 // Check whether this initializer makes the field "used". 2860 Expr *InitExpr = Field->getInClassInitializer(); 2861 if (Field->getType()->isRecordType() || 2862 (InitExpr && InitExpr->HasSideEffects(SemaRef.Context))) 2863 SemaRef.UnusedPrivateFields.remove(Field); 2864 2865 return false; 2866 } 2867 2868 // Don't build an implicit initializer for union members if none was 2869 // explicitly specified. 2870 if (Field->getParent()->isUnion() || 2871 (Indirect && isWithinAnonymousUnion(Indirect))) 2872 return false; 2873 2874 // Don't initialize incomplete or zero-length arrays. 2875 if (isIncompleteOrZeroLengthArrayType(SemaRef.Context, Field->getType())) 2876 return false; 2877 2878 // Don't try to build an implicit initializer if there were semantic 2879 // errors in any of the initializers (and therefore we might be 2880 // missing some that the user actually wrote). 2881 if (Info.AnyErrorsInInits || Field->isInvalidDecl()) 2882 return false; 2883 2884 CXXCtorInitializer *Init = 0; 2885 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, 2886 Indirect, Init)) 2887 return true; 2888 2889 if (Init) 2890 Info.AllToInit.push_back(Init); 2891 2892 return false; 2893} 2894 2895bool 2896Sema::SetDelegatingInitializer(CXXConstructorDecl *Constructor, 2897 CXXCtorInitializer *Initializer) { 2898 assert(Initializer->isDelegatingInitializer()); 2899 Constructor->setNumCtorInitializers(1); 2900 CXXCtorInitializer **initializer = 2901 new (Context) CXXCtorInitializer*[1]; 2902 memcpy(initializer, &Initializer, sizeof (CXXCtorInitializer*)); 2903 Constructor->setCtorInitializers(initializer); 2904 2905 if (CXXDestructorDecl *Dtor = LookupDestructor(Constructor->getParent())) { 2906 MarkFunctionReferenced(Initializer->getSourceLocation(), Dtor); 2907 DiagnoseUseOfDecl(Dtor, Initializer->getSourceLocation()); 2908 } 2909 2910 DelegatingCtorDecls.push_back(Constructor); 2911 2912 return false; 2913} 2914 2915bool Sema::SetCtorInitializers(CXXConstructorDecl *Constructor, 2916 CXXCtorInitializer **Initializers, 2917 unsigned NumInitializers, 2918 bool AnyErrors) { 2919 if (Constructor->isDependentContext()) { 2920 // Just store the initializers as written, they will be checked during 2921 // instantiation. 2922 if (NumInitializers > 0) { 2923 Constructor->setNumCtorInitializers(NumInitializers); 2924 CXXCtorInitializer **baseOrMemberInitializers = 2925 new (Context) CXXCtorInitializer*[NumInitializers]; 2926 memcpy(baseOrMemberInitializers, Initializers, 2927 NumInitializers * sizeof(CXXCtorInitializer*)); 2928 Constructor->setCtorInitializers(baseOrMemberInitializers); 2929 } 2930 2931 return false; 2932 } 2933 2934 BaseAndFieldInfo Info(*this, Constructor, AnyErrors); 2935 2936 // We need to build the initializer AST according to order of construction 2937 // and not what user specified in the Initializers list. 2938 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 2939 if (!ClassDecl) 2940 return true; 2941 2942 bool HadError = false; 2943 2944 for (unsigned i = 0; i < NumInitializers; i++) { 2945 CXXCtorInitializer *Member = Initializers[i]; 2946 2947 if (Member->isBaseInitializer()) 2948 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 2949 else 2950 Info.AllBaseFields[Member->getAnyMember()] = Member; 2951 } 2952 2953 // Keep track of the direct virtual bases. 2954 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 2955 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 2956 E = ClassDecl->bases_end(); I != E; ++I) { 2957 if (I->isVirtual()) 2958 DirectVBases.insert(I); 2959 } 2960 2961 // Push virtual bases before others. 2962 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2963 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2964 2965 if (CXXCtorInitializer *Value 2966 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 2967 Info.AllToInit.push_back(Value); 2968 } else if (!AnyErrors) { 2969 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 2970 CXXCtorInitializer *CXXBaseInit; 2971 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2972 VBase, IsInheritedVirtualBase, 2973 CXXBaseInit)) { 2974 HadError = true; 2975 continue; 2976 } 2977 2978 Info.AllToInit.push_back(CXXBaseInit); 2979 } 2980 } 2981 2982 // Non-virtual bases. 2983 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2984 E = ClassDecl->bases_end(); Base != E; ++Base) { 2985 // Virtuals are in the virtual base list and already constructed. 2986 if (Base->isVirtual()) 2987 continue; 2988 2989 if (CXXCtorInitializer *Value 2990 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 2991 Info.AllToInit.push_back(Value); 2992 } else if (!AnyErrors) { 2993 CXXCtorInitializer *CXXBaseInit; 2994 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2995 Base, /*IsInheritedVirtualBase=*/false, 2996 CXXBaseInit)) { 2997 HadError = true; 2998 continue; 2999 } 3000 3001 Info.AllToInit.push_back(CXXBaseInit); 3002 } 3003 } 3004 3005 // Fields. 3006 for (DeclContext::decl_iterator Mem = ClassDecl->decls_begin(), 3007 MemEnd = ClassDecl->decls_end(); 3008 Mem != MemEnd; ++Mem) { 3009 if (FieldDecl *F = dyn_cast<FieldDecl>(*Mem)) { 3010 // C++ [class.bit]p2: 3011 // A declaration for a bit-field that omits the identifier declares an 3012 // unnamed bit-field. Unnamed bit-fields are not members and cannot be 3013 // initialized. 3014 if (F->isUnnamedBitfield()) 3015 continue; 3016 3017 // If we're not generating the implicit copy/move constructor, then we'll 3018 // handle anonymous struct/union fields based on their individual 3019 // indirect fields. 3020 if (F->isAnonymousStructOrUnion() && Info.IIK == IIK_Default) 3021 continue; 3022 3023 if (CollectFieldInitializer(*this, Info, F)) 3024 HadError = true; 3025 continue; 3026 } 3027 3028 // Beyond this point, we only consider default initialization. 3029 if (Info.IIK != IIK_Default) 3030 continue; 3031 3032 if (IndirectFieldDecl *F = dyn_cast<IndirectFieldDecl>(*Mem)) { 3033 if (F->getType()->isIncompleteArrayType()) { 3034 assert(ClassDecl->hasFlexibleArrayMember() && 3035 "Incomplete array type is not valid"); 3036 continue; 3037 } 3038 3039 // Initialize each field of an anonymous struct individually. 3040 if (CollectFieldInitializer(*this, Info, F->getAnonField(), F)) 3041 HadError = true; 3042 3043 continue; 3044 } 3045 } 3046 3047 NumInitializers = Info.AllToInit.size(); 3048 if (NumInitializers > 0) { 3049 Constructor->setNumCtorInitializers(NumInitializers); 3050 CXXCtorInitializer **baseOrMemberInitializers = 3051 new (Context) CXXCtorInitializer*[NumInitializers]; 3052 memcpy(baseOrMemberInitializers, Info.AllToInit.data(), 3053 NumInitializers * sizeof(CXXCtorInitializer*)); 3054 Constructor->setCtorInitializers(baseOrMemberInitializers); 3055 3056 // Constructors implicitly reference the base and member 3057 // destructors. 3058 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 3059 Constructor->getParent()); 3060 } 3061 3062 return HadError; 3063} 3064 3065static void *GetKeyForTopLevelField(FieldDecl *Field) { 3066 // For anonymous unions, use the class declaration as the key. 3067 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 3068 if (RT->getDecl()->isAnonymousStructOrUnion()) 3069 return static_cast<void *>(RT->getDecl()); 3070 } 3071 return static_cast<void *>(Field); 3072} 3073 3074static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 3075 return const_cast<Type*>(Context.getCanonicalType(BaseType).getTypePtr()); 3076} 3077 3078static void *GetKeyForMember(ASTContext &Context, 3079 CXXCtorInitializer *Member) { 3080 if (!Member->isAnyMemberInitializer()) 3081 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 3082 3083 // For fields injected into the class via declaration of an anonymous union, 3084 // use its anonymous union class declaration as the unique key. 3085 FieldDecl *Field = Member->getAnyMember(); 3086 3087 // If the field is a member of an anonymous struct or union, our key 3088 // is the anonymous record decl that's a direct child of the class. 3089 RecordDecl *RD = Field->getParent(); 3090 if (RD->isAnonymousStructOrUnion()) { 3091 while (true) { 3092 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 3093 if (Parent->isAnonymousStructOrUnion()) 3094 RD = Parent; 3095 else 3096 break; 3097 } 3098 3099 return static_cast<void *>(RD); 3100 } 3101 3102 return static_cast<void *>(Field); 3103} 3104 3105static void 3106DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 3107 const CXXConstructorDecl *Constructor, 3108 CXXCtorInitializer **Inits, 3109 unsigned NumInits) { 3110 if (Constructor->getDeclContext()->isDependentContext()) 3111 return; 3112 3113 // Don't check initializers order unless the warning is enabled at the 3114 // location of at least one initializer. 3115 bool ShouldCheckOrder = false; 3116 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 3117 CXXCtorInitializer *Init = Inits[InitIndex]; 3118 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order, 3119 Init->getSourceLocation()) 3120 != DiagnosticsEngine::Ignored) { 3121 ShouldCheckOrder = true; 3122 break; 3123 } 3124 } 3125 if (!ShouldCheckOrder) 3126 return; 3127 3128 // Build the list of bases and members in the order that they'll 3129 // actually be initialized. The explicit initializers should be in 3130 // this same order but may be missing things. 3131 SmallVector<const void*, 32> IdealInitKeys; 3132 3133 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 3134 3135 // 1. Virtual bases. 3136 for (CXXRecordDecl::base_class_const_iterator VBase = 3137 ClassDecl->vbases_begin(), 3138 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 3139 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 3140 3141 // 2. Non-virtual bases. 3142 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 3143 E = ClassDecl->bases_end(); Base != E; ++Base) { 3144 if (Base->isVirtual()) 3145 continue; 3146 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 3147 } 3148 3149 // 3. Direct fields. 3150 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 3151 E = ClassDecl->field_end(); Field != E; ++Field) { 3152 if (Field->isUnnamedBitfield()) 3153 continue; 3154 3155 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 3156 } 3157 3158 unsigned NumIdealInits = IdealInitKeys.size(); 3159 unsigned IdealIndex = 0; 3160 3161 CXXCtorInitializer *PrevInit = 0; 3162 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 3163 CXXCtorInitializer *Init = Inits[InitIndex]; 3164 void *InitKey = GetKeyForMember(SemaRef.Context, Init); 3165 3166 // Scan forward to try to find this initializer in the idealized 3167 // initializers list. 3168 for (; IdealIndex != NumIdealInits; ++IdealIndex) 3169 if (InitKey == IdealInitKeys[IdealIndex]) 3170 break; 3171 3172 // If we didn't find this initializer, it must be because we 3173 // scanned past it on a previous iteration. That can only 3174 // happen if we're out of order; emit a warning. 3175 if (IdealIndex == NumIdealInits && PrevInit) { 3176 Sema::SemaDiagnosticBuilder D = 3177 SemaRef.Diag(PrevInit->getSourceLocation(), 3178 diag::warn_initializer_out_of_order); 3179 3180 if (PrevInit->isAnyMemberInitializer()) 3181 D << 0 << PrevInit->getAnyMember()->getDeclName(); 3182 else 3183 D << 1 << PrevInit->getTypeSourceInfo()->getType(); 3184 3185 if (Init->isAnyMemberInitializer()) 3186 D << 0 << Init->getAnyMember()->getDeclName(); 3187 else 3188 D << 1 << Init->getTypeSourceInfo()->getType(); 3189 3190 // Move back to the initializer's location in the ideal list. 3191 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 3192 if (InitKey == IdealInitKeys[IdealIndex]) 3193 break; 3194 3195 assert(IdealIndex != NumIdealInits && 3196 "initializer not found in initializer list"); 3197 } 3198 3199 PrevInit = Init; 3200 } 3201} 3202 3203namespace { 3204bool CheckRedundantInit(Sema &S, 3205 CXXCtorInitializer *Init, 3206 CXXCtorInitializer *&PrevInit) { 3207 if (!PrevInit) { 3208 PrevInit = Init; 3209 return false; 3210 } 3211 3212 if (FieldDecl *Field = Init->getMember()) 3213 S.Diag(Init->getSourceLocation(), 3214 diag::err_multiple_mem_initialization) 3215 << Field->getDeclName() 3216 << Init->getSourceRange(); 3217 else { 3218 const Type *BaseClass = Init->getBaseClass(); 3219 assert(BaseClass && "neither field nor base"); 3220 S.Diag(Init->getSourceLocation(), 3221 diag::err_multiple_base_initialization) 3222 << QualType(BaseClass, 0) 3223 << Init->getSourceRange(); 3224 } 3225 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 3226 << 0 << PrevInit->getSourceRange(); 3227 3228 return true; 3229} 3230 3231typedef std::pair<NamedDecl *, CXXCtorInitializer *> UnionEntry; 3232typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 3233 3234bool CheckRedundantUnionInit(Sema &S, 3235 CXXCtorInitializer *Init, 3236 RedundantUnionMap &Unions) { 3237 FieldDecl *Field = Init->getAnyMember(); 3238 RecordDecl *Parent = Field->getParent(); 3239 NamedDecl *Child = Field; 3240 3241 while (Parent->isAnonymousStructOrUnion() || Parent->isUnion()) { 3242 if (Parent->isUnion()) { 3243 UnionEntry &En = Unions[Parent]; 3244 if (En.first && En.first != Child) { 3245 S.Diag(Init->getSourceLocation(), 3246 diag::err_multiple_mem_union_initialization) 3247 << Field->getDeclName() 3248 << Init->getSourceRange(); 3249 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 3250 << 0 << En.second->getSourceRange(); 3251 return true; 3252 } 3253 if (!En.first) { 3254 En.first = Child; 3255 En.second = Init; 3256 } 3257 if (!Parent->isAnonymousStructOrUnion()) 3258 return false; 3259 } 3260 3261 Child = Parent; 3262 Parent = cast<RecordDecl>(Parent->getDeclContext()); 3263 } 3264 3265 return false; 3266} 3267} 3268 3269/// ActOnMemInitializers - Handle the member initializers for a constructor. 3270void Sema::ActOnMemInitializers(Decl *ConstructorDecl, 3271 SourceLocation ColonLoc, 3272 CXXCtorInitializer **meminits, 3273 unsigned NumMemInits, 3274 bool AnyErrors) { 3275 if (!ConstructorDecl) 3276 return; 3277 3278 AdjustDeclIfTemplate(ConstructorDecl); 3279 3280 CXXConstructorDecl *Constructor 3281 = dyn_cast<CXXConstructorDecl>(ConstructorDecl); 3282 3283 if (!Constructor) { 3284 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 3285 return; 3286 } 3287 3288 CXXCtorInitializer **MemInits = 3289 reinterpret_cast<CXXCtorInitializer **>(meminits); 3290 3291 // Mapping for the duplicate initializers check. 3292 // For member initializers, this is keyed with a FieldDecl*. 3293 // For base initializers, this is keyed with a Type*. 3294 llvm::DenseMap<void*, CXXCtorInitializer *> Members; 3295 3296 // Mapping for the inconsistent anonymous-union initializers check. 3297 RedundantUnionMap MemberUnions; 3298 3299 bool HadError = false; 3300 for (unsigned i = 0; i < NumMemInits; i++) { 3301 CXXCtorInitializer *Init = MemInits[i]; 3302 3303 // Set the source order index. 3304 Init->setSourceOrder(i); 3305 3306 if (Init->isAnyMemberInitializer()) { 3307 FieldDecl *Field = Init->getAnyMember(); 3308 if (CheckRedundantInit(*this, Init, Members[Field]) || 3309 CheckRedundantUnionInit(*this, Init, MemberUnions)) 3310 HadError = true; 3311 } else if (Init->isBaseInitializer()) { 3312 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 3313 if (CheckRedundantInit(*this, Init, Members[Key])) 3314 HadError = true; 3315 } else { 3316 assert(Init->isDelegatingInitializer()); 3317 // This must be the only initializer 3318 if (i != 0 || NumMemInits > 1) { 3319 Diag(MemInits[0]->getSourceLocation(), 3320 diag::err_delegating_initializer_alone) 3321 << MemInits[0]->getSourceRange(); 3322 HadError = true; 3323 // We will treat this as being the only initializer. 3324 } 3325 SetDelegatingInitializer(Constructor, MemInits[i]); 3326 // Return immediately as the initializer is set. 3327 return; 3328 } 3329 } 3330 3331 if (HadError) 3332 return; 3333 3334 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 3335 3336 SetCtorInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 3337} 3338 3339void 3340Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 3341 CXXRecordDecl *ClassDecl) { 3342 // Ignore dependent contexts. Also ignore unions, since their members never 3343 // have destructors implicitly called. 3344 if (ClassDecl->isDependentContext() || ClassDecl->isUnion()) 3345 return; 3346 3347 // FIXME: all the access-control diagnostics are positioned on the 3348 // field/base declaration. That's probably good; that said, the 3349 // user might reasonably want to know why the destructor is being 3350 // emitted, and we currently don't say. 3351 3352 // Non-static data members. 3353 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 3354 E = ClassDecl->field_end(); I != E; ++I) { 3355 FieldDecl *Field = *I; 3356 if (Field->isInvalidDecl()) 3357 continue; 3358 3359 // Don't destroy incomplete or zero-length arrays. 3360 if (isIncompleteOrZeroLengthArrayType(Context, Field->getType())) 3361 continue; 3362 3363 QualType FieldType = Context.getBaseElementType(Field->getType()); 3364 3365 const RecordType* RT = FieldType->getAs<RecordType>(); 3366 if (!RT) 3367 continue; 3368 3369 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3370 if (FieldClassDecl->isInvalidDecl()) 3371 continue; 3372 if (FieldClassDecl->hasIrrelevantDestructor()) 3373 continue; 3374 // The destructor for an implicit anonymous union member is never invoked. 3375 if (FieldClassDecl->isUnion() && FieldClassDecl->isAnonymousStructOrUnion()) 3376 continue; 3377 3378 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl); 3379 assert(Dtor && "No dtor found for FieldClassDecl!"); 3380 CheckDestructorAccess(Field->getLocation(), Dtor, 3381 PDiag(diag::err_access_dtor_field) 3382 << Field->getDeclName() 3383 << FieldType); 3384 3385 MarkFunctionReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3386 DiagnoseUseOfDecl(Dtor, Location); 3387 } 3388 3389 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 3390 3391 // Bases. 3392 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3393 E = ClassDecl->bases_end(); Base != E; ++Base) { 3394 // Bases are always records in a well-formed non-dependent class. 3395 const RecordType *RT = Base->getType()->getAs<RecordType>(); 3396 3397 // Remember direct virtual bases. 3398 if (Base->isVirtual()) 3399 DirectVirtualBases.insert(RT); 3400 3401 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3402 // If our base class is invalid, we probably can't get its dtor anyway. 3403 if (BaseClassDecl->isInvalidDecl()) 3404 continue; 3405 if (BaseClassDecl->hasIrrelevantDestructor()) 3406 continue; 3407 3408 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 3409 assert(Dtor && "No dtor found for BaseClassDecl!"); 3410 3411 // FIXME: caret should be on the start of the class name 3412 CheckDestructorAccess(Base->getLocStart(), Dtor, 3413 PDiag(diag::err_access_dtor_base) 3414 << Base->getType() 3415 << Base->getSourceRange(), 3416 Context.getTypeDeclType(ClassDecl)); 3417 3418 MarkFunctionReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3419 DiagnoseUseOfDecl(Dtor, Location); 3420 } 3421 3422 // Virtual bases. 3423 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 3424 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 3425 3426 // Bases are always records in a well-formed non-dependent class. 3427 const RecordType *RT = VBase->getType()->castAs<RecordType>(); 3428 3429 // Ignore direct virtual bases. 3430 if (DirectVirtualBases.count(RT)) 3431 continue; 3432 3433 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3434 // If our base class is invalid, we probably can't get its dtor anyway. 3435 if (BaseClassDecl->isInvalidDecl()) 3436 continue; 3437 if (BaseClassDecl->hasIrrelevantDestructor()) 3438 continue; 3439 3440 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 3441 assert(Dtor && "No dtor found for BaseClassDecl!"); 3442 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 3443 PDiag(diag::err_access_dtor_vbase) 3444 << VBase->getType(), 3445 Context.getTypeDeclType(ClassDecl)); 3446 3447 MarkFunctionReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3448 DiagnoseUseOfDecl(Dtor, Location); 3449 } 3450} 3451 3452void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) { 3453 if (!CDtorDecl) 3454 return; 3455 3456 if (CXXConstructorDecl *Constructor 3457 = dyn_cast<CXXConstructorDecl>(CDtorDecl)) 3458 SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 3459} 3460 3461bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 3462 unsigned DiagID, AbstractDiagSelID SelID) { 3463 class NonAbstractTypeDiagnoser : public TypeDiagnoser { 3464 unsigned DiagID; 3465 AbstractDiagSelID SelID; 3466 3467 public: 3468 NonAbstractTypeDiagnoser(unsigned DiagID, AbstractDiagSelID SelID) 3469 : TypeDiagnoser(DiagID == 0), DiagID(DiagID), SelID(SelID) { } 3470 3471 virtual void diagnose(Sema &S, SourceLocation Loc, QualType T) { 3472 if (SelID == -1) 3473 S.Diag(Loc, DiagID) << T; 3474 else 3475 S.Diag(Loc, DiagID) << SelID << T; 3476 } 3477 } Diagnoser(DiagID, SelID); 3478 3479 return RequireNonAbstractType(Loc, T, Diagnoser); 3480} 3481 3482bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 3483 TypeDiagnoser &Diagnoser) { 3484 if (!getLangOpts().CPlusPlus) 3485 return false; 3486 3487 if (const ArrayType *AT = Context.getAsArrayType(T)) 3488 return RequireNonAbstractType(Loc, AT->getElementType(), Diagnoser); 3489 3490 if (const PointerType *PT = T->getAs<PointerType>()) { 3491 // Find the innermost pointer type. 3492 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 3493 PT = T; 3494 3495 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 3496 return RequireNonAbstractType(Loc, AT->getElementType(), Diagnoser); 3497 } 3498 3499 const RecordType *RT = T->getAs<RecordType>(); 3500 if (!RT) 3501 return false; 3502 3503 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 3504 3505 // We can't answer whether something is abstract until it has a 3506 // definition. If it's currently being defined, we'll walk back 3507 // over all the declarations when we have a full definition. 3508 const CXXRecordDecl *Def = RD->getDefinition(); 3509 if (!Def || Def->isBeingDefined()) 3510 return false; 3511 3512 if (!RD->isAbstract()) 3513 return false; 3514 3515 Diagnoser.diagnose(*this, Loc, T); 3516 DiagnoseAbstractType(RD); 3517 3518 return true; 3519} 3520 3521void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) { 3522 // Check if we've already emitted the list of pure virtual functions 3523 // for this class. 3524 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 3525 return; 3526 3527 CXXFinalOverriderMap FinalOverriders; 3528 RD->getFinalOverriders(FinalOverriders); 3529 3530 // Keep a set of seen pure methods so we won't diagnose the same method 3531 // more than once. 3532 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; 3533 3534 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 3535 MEnd = FinalOverriders.end(); 3536 M != MEnd; 3537 ++M) { 3538 for (OverridingMethods::iterator SO = M->second.begin(), 3539 SOEnd = M->second.end(); 3540 SO != SOEnd; ++SO) { 3541 // C++ [class.abstract]p4: 3542 // A class is abstract if it contains or inherits at least one 3543 // pure virtual function for which the final overrider is pure 3544 // virtual. 3545 3546 // 3547 if (SO->second.size() != 1) 3548 continue; 3549 3550 if (!SO->second.front().Method->isPure()) 3551 continue; 3552 3553 if (!SeenPureMethods.insert(SO->second.front().Method)) 3554 continue; 3555 3556 Diag(SO->second.front().Method->getLocation(), 3557 diag::note_pure_virtual_function) 3558 << SO->second.front().Method->getDeclName() << RD->getDeclName(); 3559 } 3560 } 3561 3562 if (!PureVirtualClassDiagSet) 3563 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 3564 PureVirtualClassDiagSet->insert(RD); 3565} 3566 3567namespace { 3568struct AbstractUsageInfo { 3569 Sema &S; 3570 CXXRecordDecl *Record; 3571 CanQualType AbstractType; 3572 bool Invalid; 3573 3574 AbstractUsageInfo(Sema &S, CXXRecordDecl *Record) 3575 : S(S), Record(Record), 3576 AbstractType(S.Context.getCanonicalType( 3577 S.Context.getTypeDeclType(Record))), 3578 Invalid(false) {} 3579 3580 void DiagnoseAbstractType() { 3581 if (Invalid) return; 3582 S.DiagnoseAbstractType(Record); 3583 Invalid = true; 3584 } 3585 3586 void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel); 3587}; 3588 3589struct CheckAbstractUsage { 3590 AbstractUsageInfo &Info; 3591 const NamedDecl *Ctx; 3592 3593 CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx) 3594 : Info(Info), Ctx(Ctx) {} 3595 3596 void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 3597 switch (TL.getTypeLocClass()) { 3598#define ABSTRACT_TYPELOC(CLASS, PARENT) 3599#define TYPELOC(CLASS, PARENT) \ 3600 case TypeLoc::CLASS: Check(cast<CLASS##TypeLoc>(TL), Sel); break; 3601#include "clang/AST/TypeLocNodes.def" 3602 } 3603 } 3604 3605 void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3606 Visit(TL.getResultLoc(), Sema::AbstractReturnType); 3607 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 3608 if (!TL.getArg(I)) 3609 continue; 3610 3611 TypeSourceInfo *TSI = TL.getArg(I)->getTypeSourceInfo(); 3612 if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType); 3613 } 3614 } 3615 3616 void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3617 Visit(TL.getElementLoc(), Sema::AbstractArrayType); 3618 } 3619 3620 void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3621 // Visit the type parameters from a permissive context. 3622 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 3623 TemplateArgumentLoc TAL = TL.getArgLoc(I); 3624 if (TAL.getArgument().getKind() == TemplateArgument::Type) 3625 if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo()) 3626 Visit(TSI->getTypeLoc(), Sema::AbstractNone); 3627 // TODO: other template argument types? 3628 } 3629 } 3630 3631 // Visit pointee types from a permissive context. 3632#define CheckPolymorphic(Type) \ 3633 void Check(Type TL, Sema::AbstractDiagSelID Sel) { \ 3634 Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \ 3635 } 3636 CheckPolymorphic(PointerTypeLoc) 3637 CheckPolymorphic(ReferenceTypeLoc) 3638 CheckPolymorphic(MemberPointerTypeLoc) 3639 CheckPolymorphic(BlockPointerTypeLoc) 3640 CheckPolymorphic(AtomicTypeLoc) 3641 3642 /// Handle all the types we haven't given a more specific 3643 /// implementation for above. 3644 void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 3645 // Every other kind of type that we haven't called out already 3646 // that has an inner type is either (1) sugar or (2) contains that 3647 // inner type in some way as a subobject. 3648 if (TypeLoc Next = TL.getNextTypeLoc()) 3649 return Visit(Next, Sel); 3650 3651 // If there's no inner type and we're in a permissive context, 3652 // don't diagnose. 3653 if (Sel == Sema::AbstractNone) return; 3654 3655 // Check whether the type matches the abstract type. 3656 QualType T = TL.getType(); 3657 if (T->isArrayType()) { 3658 Sel = Sema::AbstractArrayType; 3659 T = Info.S.Context.getBaseElementType(T); 3660 } 3661 CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType(); 3662 if (CT != Info.AbstractType) return; 3663 3664 // It matched; do some magic. 3665 if (Sel == Sema::AbstractArrayType) { 3666 Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type) 3667 << T << TL.getSourceRange(); 3668 } else { 3669 Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl) 3670 << Sel << T << TL.getSourceRange(); 3671 } 3672 Info.DiagnoseAbstractType(); 3673 } 3674}; 3675 3676void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL, 3677 Sema::AbstractDiagSelID Sel) { 3678 CheckAbstractUsage(*this, D).Visit(TL, Sel); 3679} 3680 3681} 3682 3683/// Check for invalid uses of an abstract type in a method declaration. 3684static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 3685 CXXMethodDecl *MD) { 3686 // No need to do the check on definitions, which require that 3687 // the return/param types be complete. 3688 if (MD->doesThisDeclarationHaveABody()) 3689 return; 3690 3691 // For safety's sake, just ignore it if we don't have type source 3692 // information. This should never happen for non-implicit methods, 3693 // but... 3694 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo()) 3695 Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone); 3696} 3697 3698/// Check for invalid uses of an abstract type within a class definition. 3699static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 3700 CXXRecordDecl *RD) { 3701 for (CXXRecordDecl::decl_iterator 3702 I = RD->decls_begin(), E = RD->decls_end(); I != E; ++I) { 3703 Decl *D = *I; 3704 if (D->isImplicit()) continue; 3705 3706 // Methods and method templates. 3707 if (isa<CXXMethodDecl>(D)) { 3708 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D)); 3709 } else if (isa<FunctionTemplateDecl>(D)) { 3710 FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl(); 3711 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD)); 3712 3713 // Fields and static variables. 3714 } else if (isa<FieldDecl>(D)) { 3715 FieldDecl *FD = cast<FieldDecl>(D); 3716 if (TypeSourceInfo *TSI = FD->getTypeSourceInfo()) 3717 Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType); 3718 } else if (isa<VarDecl>(D)) { 3719 VarDecl *VD = cast<VarDecl>(D); 3720 if (TypeSourceInfo *TSI = VD->getTypeSourceInfo()) 3721 Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType); 3722 3723 // Nested classes and class templates. 3724 } else if (isa<CXXRecordDecl>(D)) { 3725 CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D)); 3726 } else if (isa<ClassTemplateDecl>(D)) { 3727 CheckAbstractClassUsage(Info, 3728 cast<ClassTemplateDecl>(D)->getTemplatedDecl()); 3729 } 3730 } 3731} 3732 3733/// \brief Perform semantic checks on a class definition that has been 3734/// completing, introducing implicitly-declared members, checking for 3735/// abstract types, etc. 3736void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 3737 if (!Record) 3738 return; 3739 3740 if (Record->isAbstract() && !Record->isInvalidDecl()) { 3741 AbstractUsageInfo Info(*this, Record); 3742 CheckAbstractClassUsage(Info, Record); 3743 } 3744 3745 // If this is not an aggregate type and has no user-declared constructor, 3746 // complain about any non-static data members of reference or const scalar 3747 // type, since they will never get initializers. 3748 if (!Record->isInvalidDecl() && !Record->isDependentType() && 3749 !Record->isAggregate() && !Record->hasUserDeclaredConstructor() && 3750 !Record->isLambda()) { 3751 bool Complained = false; 3752 for (RecordDecl::field_iterator F = Record->field_begin(), 3753 FEnd = Record->field_end(); 3754 F != FEnd; ++F) { 3755 if (F->hasInClassInitializer() || F->isUnnamedBitfield()) 3756 continue; 3757 3758 if (F->getType()->isReferenceType() || 3759 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 3760 if (!Complained) { 3761 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 3762 << Record->getTagKind() << Record; 3763 Complained = true; 3764 } 3765 3766 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 3767 << F->getType()->isReferenceType() 3768 << F->getDeclName(); 3769 } 3770 } 3771 } 3772 3773 if (Record->isDynamicClass() && !Record->isDependentType()) 3774 DynamicClasses.push_back(Record); 3775 3776 if (Record->getIdentifier()) { 3777 // C++ [class.mem]p13: 3778 // If T is the name of a class, then each of the following shall have a 3779 // name different from T: 3780 // - every member of every anonymous union that is a member of class T. 3781 // 3782 // C++ [class.mem]p14: 3783 // In addition, if class T has a user-declared constructor (12.1), every 3784 // non-static data member of class T shall have a name different from T. 3785 for (DeclContext::lookup_result R = Record->lookup(Record->getDeclName()); 3786 R.first != R.second; ++R.first) { 3787 NamedDecl *D = *R.first; 3788 if ((isa<FieldDecl>(D) && Record->hasUserDeclaredConstructor()) || 3789 isa<IndirectFieldDecl>(D)) { 3790 Diag(D->getLocation(), diag::err_member_name_of_class) 3791 << D->getDeclName(); 3792 break; 3793 } 3794 } 3795 } 3796 3797 // Warn if the class has virtual methods but non-virtual public destructor. 3798 if (Record->isPolymorphic() && !Record->isDependentType()) { 3799 CXXDestructorDecl *dtor = Record->getDestructor(); 3800 if (!dtor || (!dtor->isVirtual() && dtor->getAccess() == AS_public)) 3801 Diag(dtor ? dtor->getLocation() : Record->getLocation(), 3802 diag::warn_non_virtual_dtor) << Context.getRecordType(Record); 3803 } 3804 3805 // See if a method overloads virtual methods in a base 3806 /// class without overriding any. 3807 if (!Record->isDependentType()) { 3808 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 3809 MEnd = Record->method_end(); 3810 M != MEnd; ++M) { 3811 if (!M->isStatic()) 3812 DiagnoseHiddenVirtualMethods(Record, *M); 3813 } 3814 } 3815 3816 // C++0x [dcl.constexpr]p8: A constexpr specifier for a non-static member 3817 // function that is not a constructor declares that member function to be 3818 // const. [...] The class of which that function is a member shall be 3819 // a literal type. 3820 // 3821 // If the class has virtual bases, any constexpr members will already have 3822 // been diagnosed by the checks performed on the member declaration, so 3823 // suppress this (less useful) diagnostic. 3824 if (LangOpts.CPlusPlus0x && !Record->isDependentType() && 3825 !Record->isLiteral() && !Record->getNumVBases()) { 3826 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 3827 MEnd = Record->method_end(); 3828 M != MEnd; ++M) { 3829 if (M->isConstexpr() && M->isInstance() && !isa<CXXConstructorDecl>(*M)) { 3830 switch (Record->getTemplateSpecializationKind()) { 3831 case TSK_ImplicitInstantiation: 3832 case TSK_ExplicitInstantiationDeclaration: 3833 case TSK_ExplicitInstantiationDefinition: 3834 // If a template instantiates to a non-literal type, but its members 3835 // instantiate to constexpr functions, the template is technically 3836 // ill-formed, but we allow it for sanity. 3837 continue; 3838 3839 case TSK_Undeclared: 3840 case TSK_ExplicitSpecialization: 3841 RequireLiteralType(M->getLocation(), Context.getRecordType(Record), 3842 diag::err_constexpr_method_non_literal); 3843 break; 3844 } 3845 3846 // Only produce one error per class. 3847 break; 3848 } 3849 } 3850 } 3851 3852 // Declare inherited constructors. We do this eagerly here because: 3853 // - The standard requires an eager diagnostic for conflicting inherited 3854 // constructors from different classes. 3855 // - The lazy declaration of the other implicit constructors is so as to not 3856 // waste space and performance on classes that are not meant to be 3857 // instantiated (e.g. meta-functions). This doesn't apply to classes that 3858 // have inherited constructors. 3859 DeclareInheritedConstructors(Record); 3860 3861 if (!Record->isDependentType()) 3862 CheckExplicitlyDefaultedMethods(Record); 3863} 3864 3865void Sema::CheckExplicitlyDefaultedMethods(CXXRecordDecl *Record) { 3866 for (CXXRecordDecl::method_iterator MI = Record->method_begin(), 3867 ME = Record->method_end(); 3868 MI != ME; ++MI) 3869 if (!MI->isInvalidDecl() && MI->isExplicitlyDefaulted()) 3870 CheckExplicitlyDefaultedSpecialMember(*MI); 3871} 3872 3873/// Is the special member function which would be selected to perform the 3874/// specified operation on the specified class type a constexpr constructor? 3875static bool specialMemberIsConstexpr(Sema &S, CXXRecordDecl *ClassDecl, 3876 Sema::CXXSpecialMember CSM, 3877 bool ConstArg) { 3878 Sema::SpecialMemberOverloadResult *SMOR = 3879 S.LookupSpecialMember(ClassDecl, CSM, ConstArg, 3880 false, false, false, false); 3881 if (!SMOR || !SMOR->getMethod()) 3882 // A constructor we wouldn't select can't be "involved in initializing" 3883 // anything. 3884 return true; 3885 return SMOR->getMethod()->isConstexpr(); 3886} 3887 3888/// Determine whether the specified special member function would be constexpr 3889/// if it were implicitly defined. 3890static bool defaultedSpecialMemberIsConstexpr(Sema &S, CXXRecordDecl *ClassDecl, 3891 Sema::CXXSpecialMember CSM, 3892 bool ConstArg) { 3893 if (!S.getLangOpts().CPlusPlus0x) 3894 return false; 3895 3896 // C++11 [dcl.constexpr]p4: 3897 // In the definition of a constexpr constructor [...] 3898 switch (CSM) { 3899 case Sema::CXXDefaultConstructor: 3900 // Since default constructor lookup is essentially trivial (and cannot 3901 // involve, for instance, template instantiation), we compute whether a 3902 // defaulted default constructor is constexpr directly within CXXRecordDecl. 3903 // 3904 // This is important for performance; we need to know whether the default 3905 // constructor is constexpr to determine whether the type is a literal type. 3906 return ClassDecl->defaultedDefaultConstructorIsConstexpr(); 3907 3908 case Sema::CXXCopyConstructor: 3909 case Sema::CXXMoveConstructor: 3910 // For copy or move constructors, we need to perform overload resolution. 3911 break; 3912 3913 case Sema::CXXCopyAssignment: 3914 case Sema::CXXMoveAssignment: 3915 case Sema::CXXDestructor: 3916 case Sema::CXXInvalid: 3917 return false; 3918 } 3919 3920 // -- if the class is a non-empty union, or for each non-empty anonymous 3921 // union member of a non-union class, exactly one non-static data member 3922 // shall be initialized; [DR1359] 3923 // 3924 // If we squint, this is guaranteed, since exactly one non-static data member 3925 // will be initialized (if the constructor isn't deleted), we just don't know 3926 // which one. 3927 if (ClassDecl->isUnion()) 3928 return true; 3929 3930 // -- the class shall not have any virtual base classes; 3931 if (ClassDecl->getNumVBases()) 3932 return false; 3933 3934 // -- every constructor involved in initializing [...] base class 3935 // sub-objects shall be a constexpr constructor; 3936 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 3937 BEnd = ClassDecl->bases_end(); 3938 B != BEnd; ++B) { 3939 const RecordType *BaseType = B->getType()->getAs<RecordType>(); 3940 if (!BaseType) continue; 3941 3942 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 3943 if (!specialMemberIsConstexpr(S, BaseClassDecl, CSM, ConstArg)) 3944 return false; 3945 } 3946 3947 // -- every constructor involved in initializing non-static data members 3948 // [...] shall be a constexpr constructor; 3949 // -- every non-static data member and base class sub-object shall be 3950 // initialized 3951 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 3952 FEnd = ClassDecl->field_end(); 3953 F != FEnd; ++F) { 3954 if (F->isInvalidDecl()) 3955 continue; 3956 if (const RecordType *RecordTy = 3957 S.Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 3958 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 3959 if (!specialMemberIsConstexpr(S, FieldRecDecl, CSM, ConstArg)) 3960 return false; 3961 } 3962 } 3963 3964 // All OK, it's constexpr! 3965 return true; 3966} 3967 3968void Sema::CheckExplicitlyDefaultedSpecialMember(CXXMethodDecl *MD) { 3969 CXXRecordDecl *RD = MD->getParent(); 3970 CXXSpecialMember CSM = getSpecialMember(MD); 3971 3972 assert(MD->isExplicitlyDefaulted() && CSM != CXXInvalid && 3973 "not an explicitly-defaulted special member"); 3974 3975 // Whether this was the first-declared instance of the constructor. 3976 // This affects whether we implicitly add an exception spec and constexpr. 3977 bool First = MD == MD->getCanonicalDecl(); 3978 3979 bool HadError = false; 3980 3981 // C++11 [dcl.fct.def.default]p1: 3982 // A function that is explicitly defaulted shall 3983 // -- be a special member function (checked elsewhere), 3984 // -- have the same type (except for ref-qualifiers, and except that a 3985 // copy operation can take a non-const reference) as an implicit 3986 // declaration, and 3987 // -- not have default arguments. 3988 unsigned ExpectedParams = 1; 3989 if (CSM == CXXDefaultConstructor || CSM == CXXDestructor) 3990 ExpectedParams = 0; 3991 if (MD->getNumParams() != ExpectedParams) { 3992 // This also checks for default arguments: a copy or move constructor with a 3993 // default argument is classified as a default constructor, and assignment 3994 // operations and destructors can't have default arguments. 3995 Diag(MD->getLocation(), diag::err_defaulted_special_member_params) 3996 << CSM << MD->getSourceRange(); 3997 HadError = true; 3998 } 3999 4000 const FunctionProtoType *Type = MD->getType()->getAs<FunctionProtoType>(); 4001 4002 // Compute implicit exception specification, argument constness, constexpr 4003 // and triviality. 4004 ImplicitExceptionSpecification Spec(*this); 4005 bool CanHaveConstParam = false; 4006 bool Trivial; 4007 switch (CSM) { 4008 case CXXDefaultConstructor: 4009 Spec = ComputeDefaultedDefaultCtorExceptionSpec(RD); 4010 if (Spec.isDelayed()) 4011 // Exception specification depends on some deferred part of the class. 4012 // We'll try again when the class's definition has been fully processed. 4013 return; 4014 Trivial = RD->hasTrivialDefaultConstructor(); 4015 break; 4016 case CXXCopyConstructor: 4017 llvm::tie(Spec, CanHaveConstParam) = 4018 ComputeDefaultedCopyCtorExceptionSpecAndConst(RD); 4019 Trivial = RD->hasTrivialCopyConstructor(); 4020 break; 4021 case CXXCopyAssignment: 4022 llvm::tie(Spec, CanHaveConstParam) = 4023 ComputeDefaultedCopyAssignmentExceptionSpecAndConst(RD); 4024 Trivial = RD->hasTrivialCopyAssignment(); 4025 break; 4026 case CXXMoveConstructor: 4027 Spec = ComputeDefaultedMoveCtorExceptionSpec(RD); 4028 Trivial = RD->hasTrivialMoveConstructor(); 4029 break; 4030 case CXXMoveAssignment: 4031 Spec = ComputeDefaultedMoveAssignmentExceptionSpec(RD); 4032 Trivial = RD->hasTrivialMoveAssignment(); 4033 break; 4034 case CXXDestructor: 4035 Spec = ComputeDefaultedDtorExceptionSpec(RD); 4036 Trivial = RD->hasTrivialDestructor(); 4037 break; 4038 case CXXInvalid: 4039 llvm_unreachable("non-special member explicitly defaulted!"); 4040 } 4041 4042 QualType ReturnType = Context.VoidTy; 4043 if (CSM == CXXCopyAssignment || CSM == CXXMoveAssignment) { 4044 // Check for return type matching. 4045 ReturnType = Type->getResultType(); 4046 QualType ExpectedReturnType = 4047 Context.getLValueReferenceType(Context.getTypeDeclType(RD)); 4048 if (!Context.hasSameType(ReturnType, ExpectedReturnType)) { 4049 Diag(MD->getLocation(), diag::err_defaulted_special_member_return_type) 4050 << (CSM == CXXMoveAssignment) << ExpectedReturnType; 4051 HadError = true; 4052 } 4053 4054 // A defaulted special member cannot have cv-qualifiers. 4055 if (Type->getTypeQuals()) { 4056 Diag(MD->getLocation(), diag::err_defaulted_special_member_quals) 4057 << (CSM == CXXMoveAssignment); 4058 HadError = true; 4059 } 4060 } 4061 4062 // Check for parameter type matching. 4063 QualType ArgType = ExpectedParams ? Type->getArgType(0) : QualType(); 4064 bool HasConstParam = false; 4065 if (ExpectedParams && ArgType->isReferenceType()) { 4066 // Argument must be reference to possibly-const T. 4067 QualType ReferentType = ArgType->getPointeeType(); 4068 HasConstParam = ReferentType.isConstQualified(); 4069 4070 if (ReferentType.isVolatileQualified()) { 4071 Diag(MD->getLocation(), 4072 diag::err_defaulted_special_member_volatile_param) << CSM; 4073 HadError = true; 4074 } 4075 4076 if (HasConstParam && !CanHaveConstParam) { 4077 if (CSM == CXXCopyConstructor || CSM == CXXCopyAssignment) { 4078 Diag(MD->getLocation(), 4079 diag::err_defaulted_special_member_copy_const_param) 4080 << (CSM == CXXCopyAssignment); 4081 // FIXME: Explain why this special member can't be const. 4082 } else { 4083 Diag(MD->getLocation(), 4084 diag::err_defaulted_special_member_move_const_param) 4085 << (CSM == CXXMoveAssignment); 4086 } 4087 HadError = true; 4088 } 4089 4090 // If a function is explicitly defaulted on its first declaration, it shall 4091 // have the same parameter type as if it had been implicitly declared. 4092 // (Presumably this is to prevent it from being trivial?) 4093 if (!HasConstParam && CanHaveConstParam && First) 4094 Diag(MD->getLocation(), 4095 diag::err_defaulted_special_member_copy_non_const_param) 4096 << (CSM == CXXCopyAssignment); 4097 } else if (ExpectedParams) { 4098 // A copy assignment operator can take its argument by value, but a 4099 // defaulted one cannot. 4100 assert(CSM == CXXCopyAssignment && "unexpected non-ref argument"); 4101 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_not_ref); 4102 HadError = true; 4103 } 4104 4105 // Rebuild the type with the implicit exception specification added. 4106 FunctionProtoType::ExtProtoInfo EPI = Type->getExtProtoInfo(); 4107 Spec.getEPI(EPI); 4108 const FunctionProtoType *ImplicitType = cast<FunctionProtoType>( 4109 Context.getFunctionType(ReturnType, &ArgType, ExpectedParams, EPI)); 4110 4111 // C++11 [dcl.fct.def.default]p2: 4112 // An explicitly-defaulted function may be declared constexpr only if it 4113 // would have been implicitly declared as constexpr, 4114 // Do not apply this rule to members of class templates, since core issue 1358 4115 // makes such functions always instantiate to constexpr functions. For 4116 // non-constructors, this is checked elsewhere. 4117 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, RD, CSM, 4118 HasConstParam); 4119 if (isa<CXXConstructorDecl>(MD) && MD->isConstexpr() && !Constexpr && 4120 MD->getTemplatedKind() == FunctionDecl::TK_NonTemplate) { 4121 Diag(MD->getLocStart(), diag::err_incorrect_defaulted_constexpr) << CSM; 4122 // FIXME: Explain why the constructor can't be constexpr. 4123 HadError = true; 4124 } 4125 // and may have an explicit exception-specification only if it is compatible 4126 // with the exception-specification on the implicit declaration. 4127 if (Type->hasExceptionSpec() && 4128 CheckEquivalentExceptionSpec( 4129 PDiag(diag::err_incorrect_defaulted_exception_spec) << CSM, 4130 PDiag(), ImplicitType, SourceLocation(), Type, MD->getLocation())) 4131 HadError = true; 4132 4133 // If a function is explicitly defaulted on its first declaration, 4134 if (First) { 4135 // -- it is implicitly considered to be constexpr if the implicit 4136 // definition would be, 4137 MD->setConstexpr(Constexpr); 4138 4139 // -- it is implicitly considered to have the same exception-specification 4140 // as if it had been implicitly declared, 4141 MD->setType(QualType(ImplicitType, 0)); 4142 4143 // Such a function is also trivial if the implicitly-declared function 4144 // would have been. 4145 MD->setTrivial(Trivial); 4146 } 4147 4148 if (ShouldDeleteSpecialMember(MD, CSM)) { 4149 if (First) { 4150 MD->setDeletedAsWritten(); 4151 } else { 4152 // C++11 [dcl.fct.def.default]p4: 4153 // [For a] user-provided explicitly-defaulted function [...] if such a 4154 // function is implicitly defined as deleted, the program is ill-formed. 4155 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) << CSM; 4156 HadError = true; 4157 } 4158 } 4159 4160 if (HadError) 4161 MD->setInvalidDecl(); 4162} 4163 4164namespace { 4165struct SpecialMemberDeletionInfo { 4166 Sema &S; 4167 CXXMethodDecl *MD; 4168 Sema::CXXSpecialMember CSM; 4169 bool Diagnose; 4170 4171 // Properties of the special member, computed for convenience. 4172 bool IsConstructor, IsAssignment, IsMove, ConstArg, VolatileArg; 4173 SourceLocation Loc; 4174 4175 bool AllFieldsAreConst; 4176 4177 SpecialMemberDeletionInfo(Sema &S, CXXMethodDecl *MD, 4178 Sema::CXXSpecialMember CSM, bool Diagnose) 4179 : S(S), MD(MD), CSM(CSM), Diagnose(Diagnose), 4180 IsConstructor(false), IsAssignment(false), IsMove(false), 4181 ConstArg(false), VolatileArg(false), Loc(MD->getLocation()), 4182 AllFieldsAreConst(true) { 4183 switch (CSM) { 4184 case Sema::CXXDefaultConstructor: 4185 case Sema::CXXCopyConstructor: 4186 IsConstructor = true; 4187 break; 4188 case Sema::CXXMoveConstructor: 4189 IsConstructor = true; 4190 IsMove = true; 4191 break; 4192 case Sema::CXXCopyAssignment: 4193 IsAssignment = true; 4194 break; 4195 case Sema::CXXMoveAssignment: 4196 IsAssignment = true; 4197 IsMove = true; 4198 break; 4199 case Sema::CXXDestructor: 4200 break; 4201 case Sema::CXXInvalid: 4202 llvm_unreachable("invalid special member kind"); 4203 } 4204 4205 if (MD->getNumParams()) { 4206 ConstArg = MD->getParamDecl(0)->getType().isConstQualified(); 4207 VolatileArg = MD->getParamDecl(0)->getType().isVolatileQualified(); 4208 } 4209 } 4210 4211 bool inUnion() const { return MD->getParent()->isUnion(); } 4212 4213 /// Look up the corresponding special member in the given class. 4214 Sema::SpecialMemberOverloadResult *lookupIn(CXXRecordDecl *Class) { 4215 unsigned TQ = MD->getTypeQualifiers(); 4216 return S.LookupSpecialMember(Class, CSM, ConstArg, VolatileArg, 4217 MD->getRefQualifier() == RQ_RValue, 4218 TQ & Qualifiers::Const, 4219 TQ & Qualifiers::Volatile); 4220 } 4221 4222 typedef llvm::PointerUnion<CXXBaseSpecifier*, FieldDecl*> Subobject; 4223 4224 bool shouldDeleteForBase(CXXBaseSpecifier *Base); 4225 bool shouldDeleteForField(FieldDecl *FD); 4226 bool shouldDeleteForAllConstMembers(); 4227 4228 bool shouldDeleteForClassSubobject(CXXRecordDecl *Class, Subobject Subobj); 4229 bool shouldDeleteForSubobjectCall(Subobject Subobj, 4230 Sema::SpecialMemberOverloadResult *SMOR, 4231 bool IsDtorCallInCtor); 4232 4233 bool isAccessible(Subobject Subobj, CXXMethodDecl *D); 4234}; 4235} 4236 4237/// Is the given special member inaccessible when used on the given 4238/// sub-object. 4239bool SpecialMemberDeletionInfo::isAccessible(Subobject Subobj, 4240 CXXMethodDecl *target) { 4241 /// If we're operating on a base class, the object type is the 4242 /// type of this special member. 4243 QualType objectTy; 4244 AccessSpecifier access = target->getAccess();; 4245 if (CXXBaseSpecifier *base = Subobj.dyn_cast<CXXBaseSpecifier*>()) { 4246 objectTy = S.Context.getTypeDeclType(MD->getParent()); 4247 access = CXXRecordDecl::MergeAccess(base->getAccessSpecifier(), access); 4248 4249 // If we're operating on a field, the object type is the type of the field. 4250 } else { 4251 objectTy = S.Context.getTypeDeclType(target->getParent()); 4252 } 4253 4254 return S.isSpecialMemberAccessibleForDeletion(target, access, objectTy); 4255} 4256 4257/// Check whether we should delete a special member due to the implicit 4258/// definition containing a call to a special member of a subobject. 4259bool SpecialMemberDeletionInfo::shouldDeleteForSubobjectCall( 4260 Subobject Subobj, Sema::SpecialMemberOverloadResult *SMOR, 4261 bool IsDtorCallInCtor) { 4262 CXXMethodDecl *Decl = SMOR->getMethod(); 4263 FieldDecl *Field = Subobj.dyn_cast<FieldDecl*>(); 4264 4265 int DiagKind = -1; 4266 4267 if (SMOR->getKind() == Sema::SpecialMemberOverloadResult::NoMemberOrDeleted) 4268 DiagKind = !Decl ? 0 : 1; 4269 else if (SMOR->getKind() == Sema::SpecialMemberOverloadResult::Ambiguous) 4270 DiagKind = 2; 4271 else if (!isAccessible(Subobj, Decl)) 4272 DiagKind = 3; 4273 else if (!IsDtorCallInCtor && Field && Field->getParent()->isUnion() && 4274 !Decl->isTrivial()) { 4275 // A member of a union must have a trivial corresponding special member. 4276 // As a weird special case, a destructor call from a union's constructor 4277 // must be accessible and non-deleted, but need not be trivial. Such a 4278 // destructor is never actually called, but is semantically checked as 4279 // if it were. 4280 DiagKind = 4; 4281 } 4282 4283 if (DiagKind == -1) 4284 return false; 4285 4286 if (Diagnose) { 4287 if (Field) { 4288 S.Diag(Field->getLocation(), 4289 diag::note_deleted_special_member_class_subobject) 4290 << CSM << MD->getParent() << /*IsField*/true 4291 << Field << DiagKind << IsDtorCallInCtor; 4292 } else { 4293 CXXBaseSpecifier *Base = Subobj.get<CXXBaseSpecifier*>(); 4294 S.Diag(Base->getLocStart(), 4295 diag::note_deleted_special_member_class_subobject) 4296 << CSM << MD->getParent() << /*IsField*/false 4297 << Base->getType() << DiagKind << IsDtorCallInCtor; 4298 } 4299 4300 if (DiagKind == 1) 4301 S.NoteDeletedFunction(Decl); 4302 // FIXME: Explain inaccessibility if DiagKind == 3. 4303 } 4304 4305 return true; 4306} 4307 4308/// Check whether we should delete a special member function due to having a 4309/// direct or virtual base class or static data member of class type M. 4310bool SpecialMemberDeletionInfo::shouldDeleteForClassSubobject( 4311 CXXRecordDecl *Class, Subobject Subobj) { 4312 FieldDecl *Field = Subobj.dyn_cast<FieldDecl*>(); 4313 4314 // C++11 [class.ctor]p5: 4315 // -- any direct or virtual base class, or non-static data member with no 4316 // brace-or-equal-initializer, has class type M (or array thereof) and 4317 // either M has no default constructor or overload resolution as applied 4318 // to M's default constructor results in an ambiguity or in a function 4319 // that is deleted or inaccessible 4320 // C++11 [class.copy]p11, C++11 [class.copy]p23: 4321 // -- a direct or virtual base class B that cannot be copied/moved because 4322 // overload resolution, as applied to B's corresponding special member, 4323 // results in an ambiguity or a function that is deleted or inaccessible 4324 // from the defaulted special member 4325 // C++11 [class.dtor]p5: 4326 // -- any direct or virtual base class [...] has a type with a destructor 4327 // that is deleted or inaccessible 4328 if (!(CSM == Sema::CXXDefaultConstructor && 4329 Field && Field->hasInClassInitializer()) && 4330 shouldDeleteForSubobjectCall(Subobj, lookupIn(Class), false)) 4331 return true; 4332 4333 // C++11 [class.ctor]p5, C++11 [class.copy]p11: 4334 // -- any direct or virtual base class or non-static data member has a 4335 // type with a destructor that is deleted or inaccessible 4336 if (IsConstructor) { 4337 Sema::SpecialMemberOverloadResult *SMOR = 4338 S.LookupSpecialMember(Class, Sema::CXXDestructor, 4339 false, false, false, false, false); 4340 if (shouldDeleteForSubobjectCall(Subobj, SMOR, true)) 4341 return true; 4342 } 4343 4344 return false; 4345} 4346 4347/// Check whether we should delete a special member function due to the class 4348/// having a particular direct or virtual base class. 4349bool SpecialMemberDeletionInfo::shouldDeleteForBase(CXXBaseSpecifier *Base) { 4350 CXXRecordDecl *BaseClass = Base->getType()->getAsCXXRecordDecl(); 4351 return shouldDeleteForClassSubobject(BaseClass, Base); 4352} 4353 4354/// Check whether we should delete a special member function due to the class 4355/// having a particular non-static data member. 4356bool SpecialMemberDeletionInfo::shouldDeleteForField(FieldDecl *FD) { 4357 QualType FieldType = S.Context.getBaseElementType(FD->getType()); 4358 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4359 4360 if (CSM == Sema::CXXDefaultConstructor) { 4361 // For a default constructor, all references must be initialized in-class 4362 // and, if a union, it must have a non-const member. 4363 if (FieldType->isReferenceType() && !FD->hasInClassInitializer()) { 4364 if (Diagnose) 4365 S.Diag(FD->getLocation(), diag::note_deleted_default_ctor_uninit_field) 4366 << MD->getParent() << FD << FieldType << /*Reference*/0; 4367 return true; 4368 } 4369 // C++11 [class.ctor]p5: any non-variant non-static data member of 4370 // const-qualified type (or array thereof) with no 4371 // brace-or-equal-initializer does not have a user-provided default 4372 // constructor. 4373 if (!inUnion() && FieldType.isConstQualified() && 4374 !FD->hasInClassInitializer() && 4375 (!FieldRecord || !FieldRecord->hasUserProvidedDefaultConstructor())) { 4376 if (Diagnose) 4377 S.Diag(FD->getLocation(), diag::note_deleted_default_ctor_uninit_field) 4378 << MD->getParent() << FD << FD->getType() << /*Const*/1; 4379 return true; 4380 } 4381 4382 if (inUnion() && !FieldType.isConstQualified()) 4383 AllFieldsAreConst = false; 4384 } else if (CSM == Sema::CXXCopyConstructor) { 4385 // For a copy constructor, data members must not be of rvalue reference 4386 // type. 4387 if (FieldType->isRValueReferenceType()) { 4388 if (Diagnose) 4389 S.Diag(FD->getLocation(), diag::note_deleted_copy_ctor_rvalue_reference) 4390 << MD->getParent() << FD << FieldType; 4391 return true; 4392 } 4393 } else if (IsAssignment) { 4394 // For an assignment operator, data members must not be of reference type. 4395 if (FieldType->isReferenceType()) { 4396 if (Diagnose) 4397 S.Diag(FD->getLocation(), diag::note_deleted_assign_field) 4398 << IsMove << MD->getParent() << FD << FieldType << /*Reference*/0; 4399 return true; 4400 } 4401 if (!FieldRecord && FieldType.isConstQualified()) { 4402 // C++11 [class.copy]p23: 4403 // -- a non-static data member of const non-class type (or array thereof) 4404 if (Diagnose) 4405 S.Diag(FD->getLocation(), diag::note_deleted_assign_field) 4406 << IsMove << MD->getParent() << FD << FD->getType() << /*Const*/1; 4407 return true; 4408 } 4409 } 4410 4411 if (FieldRecord) { 4412 // Some additional restrictions exist on the variant members. 4413 if (!inUnion() && FieldRecord->isUnion() && 4414 FieldRecord->isAnonymousStructOrUnion()) { 4415 bool AllVariantFieldsAreConst = true; 4416 4417 // FIXME: Handle anonymous unions declared within anonymous unions. 4418 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4419 UE = FieldRecord->field_end(); 4420 UI != UE; ++UI) { 4421 QualType UnionFieldType = S.Context.getBaseElementType(UI->getType()); 4422 4423 if (!UnionFieldType.isConstQualified()) 4424 AllVariantFieldsAreConst = false; 4425 4426 CXXRecordDecl *UnionFieldRecord = UnionFieldType->getAsCXXRecordDecl(); 4427 if (UnionFieldRecord && 4428 shouldDeleteForClassSubobject(UnionFieldRecord, *UI)) 4429 return true; 4430 } 4431 4432 // At least one member in each anonymous union must be non-const 4433 if (CSM == Sema::CXXDefaultConstructor && AllVariantFieldsAreConst && 4434 FieldRecord->field_begin() != FieldRecord->field_end()) { 4435 if (Diagnose) 4436 S.Diag(FieldRecord->getLocation(), 4437 diag::note_deleted_default_ctor_all_const) 4438 << MD->getParent() << /*anonymous union*/1; 4439 return true; 4440 } 4441 4442 // Don't check the implicit member of the anonymous union type. 4443 // This is technically non-conformant, but sanity demands it. 4444 return false; 4445 } 4446 4447 if (shouldDeleteForClassSubobject(FieldRecord, FD)) 4448 return true; 4449 } 4450 4451 return false; 4452} 4453 4454/// C++11 [class.ctor] p5: 4455/// A defaulted default constructor for a class X is defined as deleted if 4456/// X is a union and all of its variant members are of const-qualified type. 4457bool SpecialMemberDeletionInfo::shouldDeleteForAllConstMembers() { 4458 // This is a silly definition, because it gives an empty union a deleted 4459 // default constructor. Don't do that. 4460 if (CSM == Sema::CXXDefaultConstructor && inUnion() && AllFieldsAreConst && 4461 (MD->getParent()->field_begin() != MD->getParent()->field_end())) { 4462 if (Diagnose) 4463 S.Diag(MD->getParent()->getLocation(), 4464 diag::note_deleted_default_ctor_all_const) 4465 << MD->getParent() << /*not anonymous union*/0; 4466 return true; 4467 } 4468 return false; 4469} 4470 4471/// Determine whether a defaulted special member function should be defined as 4472/// deleted, as specified in C++11 [class.ctor]p5, C++11 [class.copy]p11, 4473/// C++11 [class.copy]p23, and C++11 [class.dtor]p5. 4474bool Sema::ShouldDeleteSpecialMember(CXXMethodDecl *MD, CXXSpecialMember CSM, 4475 bool Diagnose) { 4476 assert(!MD->isInvalidDecl()); 4477 CXXRecordDecl *RD = MD->getParent(); 4478 assert(!RD->isDependentType() && "do deletion after instantiation"); 4479 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4480 return false; 4481 4482 // C++11 [expr.lambda.prim]p19: 4483 // The closure type associated with a lambda-expression has a 4484 // deleted (8.4.3) default constructor and a deleted copy 4485 // assignment operator. 4486 if (RD->isLambda() && 4487 (CSM == CXXDefaultConstructor || CSM == CXXCopyAssignment)) { 4488 if (Diagnose) 4489 Diag(RD->getLocation(), diag::note_lambda_decl); 4490 return true; 4491 } 4492 4493 // For an anonymous struct or union, the copy and assignment special members 4494 // will never be used, so skip the check. For an anonymous union declared at 4495 // namespace scope, the constructor and destructor are used. 4496 if (CSM != CXXDefaultConstructor && CSM != CXXDestructor && 4497 RD->isAnonymousStructOrUnion()) 4498 return false; 4499 4500 // C++11 [class.copy]p7, p18: 4501 // If the class definition declares a move constructor or move assignment 4502 // operator, an implicitly declared copy constructor or copy assignment 4503 // operator is defined as deleted. 4504 if (MD->isImplicit() && 4505 (CSM == CXXCopyConstructor || CSM == CXXCopyAssignment)) { 4506 CXXMethodDecl *UserDeclaredMove = 0; 4507 4508 // In Microsoft mode, a user-declared move only causes the deletion of the 4509 // corresponding copy operation, not both copy operations. 4510 if (RD->hasUserDeclaredMoveConstructor() && 4511 (!getLangOpts().MicrosoftMode || CSM == CXXCopyConstructor)) { 4512 if (!Diagnose) return true; 4513 UserDeclaredMove = RD->getMoveConstructor(); 4514 assert(UserDeclaredMove); 4515 } else if (RD->hasUserDeclaredMoveAssignment() && 4516 (!getLangOpts().MicrosoftMode || CSM == CXXCopyAssignment)) { 4517 if (!Diagnose) return true; 4518 UserDeclaredMove = RD->getMoveAssignmentOperator(); 4519 assert(UserDeclaredMove); 4520 } 4521 4522 if (UserDeclaredMove) { 4523 Diag(UserDeclaredMove->getLocation(), 4524 diag::note_deleted_copy_user_declared_move) 4525 << (CSM == CXXCopyAssignment) << RD 4526 << UserDeclaredMove->isMoveAssignmentOperator(); 4527 return true; 4528 } 4529 } 4530 4531 // Do access control from the special member function 4532 ContextRAII MethodContext(*this, MD); 4533 4534 // C++11 [class.dtor]p5: 4535 // -- for a virtual destructor, lookup of the non-array deallocation function 4536 // results in an ambiguity or in a function that is deleted or inaccessible 4537 if (CSM == CXXDestructor && MD->isVirtual()) { 4538 FunctionDecl *OperatorDelete = 0; 4539 DeclarationName Name = 4540 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 4541 if (FindDeallocationFunction(MD->getLocation(), MD->getParent(), Name, 4542 OperatorDelete, false)) { 4543 if (Diagnose) 4544 Diag(RD->getLocation(), diag::note_deleted_dtor_no_operator_delete); 4545 return true; 4546 } 4547 } 4548 4549 SpecialMemberDeletionInfo SMI(*this, MD, CSM, Diagnose); 4550 4551 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4552 BE = RD->bases_end(); BI != BE; ++BI) 4553 if (!BI->isVirtual() && 4554 SMI.shouldDeleteForBase(BI)) 4555 return true; 4556 4557 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 4558 BE = RD->vbases_end(); BI != BE; ++BI) 4559 if (SMI.shouldDeleteForBase(BI)) 4560 return true; 4561 4562 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4563 FE = RD->field_end(); FI != FE; ++FI) 4564 if (!FI->isInvalidDecl() && !FI->isUnnamedBitfield() && 4565 SMI.shouldDeleteForField(*FI)) 4566 return true; 4567 4568 if (SMI.shouldDeleteForAllConstMembers()) 4569 return true; 4570 4571 return false; 4572} 4573 4574/// \brief Data used with FindHiddenVirtualMethod 4575namespace { 4576 struct FindHiddenVirtualMethodData { 4577 Sema *S; 4578 CXXMethodDecl *Method; 4579 llvm::SmallPtrSet<const CXXMethodDecl *, 8> OverridenAndUsingBaseMethods; 4580 SmallVector<CXXMethodDecl *, 8> OverloadedMethods; 4581 }; 4582} 4583 4584/// \brief Member lookup function that determines whether a given C++ 4585/// method overloads virtual methods in a base class without overriding any, 4586/// to be used with CXXRecordDecl::lookupInBases(). 4587static bool FindHiddenVirtualMethod(const CXXBaseSpecifier *Specifier, 4588 CXXBasePath &Path, 4589 void *UserData) { 4590 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 4591 4592 FindHiddenVirtualMethodData &Data 4593 = *static_cast<FindHiddenVirtualMethodData*>(UserData); 4594 4595 DeclarationName Name = Data.Method->getDeclName(); 4596 assert(Name.getNameKind() == DeclarationName::Identifier); 4597 4598 bool foundSameNameMethod = false; 4599 SmallVector<CXXMethodDecl *, 8> overloadedMethods; 4600 for (Path.Decls = BaseRecord->lookup(Name); 4601 Path.Decls.first != Path.Decls.second; 4602 ++Path.Decls.first) { 4603 NamedDecl *D = *Path.Decls.first; 4604 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 4605 MD = MD->getCanonicalDecl(); 4606 foundSameNameMethod = true; 4607 // Interested only in hidden virtual methods. 4608 if (!MD->isVirtual()) 4609 continue; 4610 // If the method we are checking overrides a method from its base 4611 // don't warn about the other overloaded methods. 4612 if (!Data.S->IsOverload(Data.Method, MD, false)) 4613 return true; 4614 // Collect the overload only if its hidden. 4615 if (!Data.OverridenAndUsingBaseMethods.count(MD)) 4616 overloadedMethods.push_back(MD); 4617 } 4618 } 4619 4620 if (foundSameNameMethod) 4621 Data.OverloadedMethods.append(overloadedMethods.begin(), 4622 overloadedMethods.end()); 4623 return foundSameNameMethod; 4624} 4625 4626/// \brief See if a method overloads virtual methods in a base class without 4627/// overriding any. 4628void Sema::DiagnoseHiddenVirtualMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 4629 if (Diags.getDiagnosticLevel(diag::warn_overloaded_virtual, 4630 MD->getLocation()) == DiagnosticsEngine::Ignored) 4631 return; 4632 if (!MD->getDeclName().isIdentifier()) 4633 return; 4634 4635 CXXBasePaths Paths(/*FindAmbiguities=*/true, // true to look in all bases. 4636 /*bool RecordPaths=*/false, 4637 /*bool DetectVirtual=*/false); 4638 FindHiddenVirtualMethodData Data; 4639 Data.Method = MD; 4640 Data.S = this; 4641 4642 // Keep the base methods that were overriden or introduced in the subclass 4643 // by 'using' in a set. A base method not in this set is hidden. 4644 for (DeclContext::lookup_result res = DC->lookup(MD->getDeclName()); 4645 res.first != res.second; ++res.first) { 4646 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*res.first)) 4647 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 4648 E = MD->end_overridden_methods(); 4649 I != E; ++I) 4650 Data.OverridenAndUsingBaseMethods.insert((*I)->getCanonicalDecl()); 4651 if (UsingShadowDecl *shad = dyn_cast<UsingShadowDecl>(*res.first)) 4652 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(shad->getTargetDecl())) 4653 Data.OverridenAndUsingBaseMethods.insert(MD->getCanonicalDecl()); 4654 } 4655 4656 if (DC->lookupInBases(&FindHiddenVirtualMethod, &Data, Paths) && 4657 !Data.OverloadedMethods.empty()) { 4658 Diag(MD->getLocation(), diag::warn_overloaded_virtual) 4659 << MD << (Data.OverloadedMethods.size() > 1); 4660 4661 for (unsigned i = 0, e = Data.OverloadedMethods.size(); i != e; ++i) { 4662 CXXMethodDecl *overloadedMD = Data.OverloadedMethods[i]; 4663 Diag(overloadedMD->getLocation(), 4664 diag::note_hidden_overloaded_virtual_declared_here) << overloadedMD; 4665 } 4666 } 4667} 4668 4669void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 4670 Decl *TagDecl, 4671 SourceLocation LBrac, 4672 SourceLocation RBrac, 4673 AttributeList *AttrList) { 4674 if (!TagDecl) 4675 return; 4676 4677 AdjustDeclIfTemplate(TagDecl); 4678 4679 ActOnFields(S, RLoc, TagDecl, llvm::makeArrayRef( 4680 // strict aliasing violation! 4681 reinterpret_cast<Decl**>(FieldCollector->getCurFields()), 4682 FieldCollector->getCurNumFields()), LBrac, RBrac, AttrList); 4683 4684 CheckCompletedCXXClass( 4685 dyn_cast_or_null<CXXRecordDecl>(TagDecl)); 4686} 4687 4688/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 4689/// special functions, such as the default constructor, copy 4690/// constructor, or destructor, to the given C++ class (C++ 4691/// [special]p1). This routine can only be executed just before the 4692/// definition of the class is complete. 4693void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 4694 if (!ClassDecl->hasUserDeclaredConstructor()) 4695 ++ASTContext::NumImplicitDefaultConstructors; 4696 4697 if (!ClassDecl->hasUserDeclaredCopyConstructor()) 4698 ++ASTContext::NumImplicitCopyConstructors; 4699 4700 if (getLangOpts().CPlusPlus0x && ClassDecl->needsImplicitMoveConstructor()) 4701 ++ASTContext::NumImplicitMoveConstructors; 4702 4703 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 4704 ++ASTContext::NumImplicitCopyAssignmentOperators; 4705 4706 // If we have a dynamic class, then the copy assignment operator may be 4707 // virtual, so we have to declare it immediately. This ensures that, e.g., 4708 // it shows up in the right place in the vtable and that we diagnose 4709 // problems with the implicit exception specification. 4710 if (ClassDecl->isDynamicClass()) 4711 DeclareImplicitCopyAssignment(ClassDecl); 4712 } 4713 4714 if (getLangOpts().CPlusPlus0x && ClassDecl->needsImplicitMoveAssignment()) { 4715 ++ASTContext::NumImplicitMoveAssignmentOperators; 4716 4717 // Likewise for the move assignment operator. 4718 if (ClassDecl->isDynamicClass()) 4719 DeclareImplicitMoveAssignment(ClassDecl); 4720 } 4721 4722 if (!ClassDecl->hasUserDeclaredDestructor()) { 4723 ++ASTContext::NumImplicitDestructors; 4724 4725 // If we have a dynamic class, then the destructor may be virtual, so we 4726 // have to declare the destructor immediately. This ensures that, e.g., it 4727 // shows up in the right place in the vtable and that we diagnose problems 4728 // with the implicit exception specification. 4729 if (ClassDecl->isDynamicClass()) 4730 DeclareImplicitDestructor(ClassDecl); 4731 } 4732} 4733 4734void Sema::ActOnReenterDeclaratorTemplateScope(Scope *S, DeclaratorDecl *D) { 4735 if (!D) 4736 return; 4737 4738 int NumParamList = D->getNumTemplateParameterLists(); 4739 for (int i = 0; i < NumParamList; i++) { 4740 TemplateParameterList* Params = D->getTemplateParameterList(i); 4741 for (TemplateParameterList::iterator Param = Params->begin(), 4742 ParamEnd = Params->end(); 4743 Param != ParamEnd; ++Param) { 4744 NamedDecl *Named = cast<NamedDecl>(*Param); 4745 if (Named->getDeclName()) { 4746 S->AddDecl(Named); 4747 IdResolver.AddDecl(Named); 4748 } 4749 } 4750 } 4751} 4752 4753void Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) { 4754 if (!D) 4755 return; 4756 4757 TemplateParameterList *Params = 0; 4758 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 4759 Params = Template->getTemplateParameters(); 4760 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 4761 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 4762 Params = PartialSpec->getTemplateParameters(); 4763 else 4764 return; 4765 4766 for (TemplateParameterList::iterator Param = Params->begin(), 4767 ParamEnd = Params->end(); 4768 Param != ParamEnd; ++Param) { 4769 NamedDecl *Named = cast<NamedDecl>(*Param); 4770 if (Named->getDeclName()) { 4771 S->AddDecl(Named); 4772 IdResolver.AddDecl(Named); 4773 } 4774 } 4775} 4776 4777void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 4778 if (!RecordD) return; 4779 AdjustDeclIfTemplate(RecordD); 4780 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD); 4781 PushDeclContext(S, Record); 4782} 4783 4784void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 4785 if (!RecordD) return; 4786 PopDeclContext(); 4787} 4788 4789/// ActOnStartDelayedCXXMethodDeclaration - We have completed 4790/// parsing a top-level (non-nested) C++ class, and we are now 4791/// parsing those parts of the given Method declaration that could 4792/// not be parsed earlier (C++ [class.mem]p2), such as default 4793/// arguments. This action should enter the scope of the given 4794/// Method declaration as if we had just parsed the qualified method 4795/// name. However, it should not bring the parameters into scope; 4796/// that will be performed by ActOnDelayedCXXMethodParameter. 4797void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 4798} 4799 4800/// ActOnDelayedCXXMethodParameter - We've already started a delayed 4801/// C++ method declaration. We're (re-)introducing the given 4802/// function parameter into scope for use in parsing later parts of 4803/// the method declaration. For example, we could see an 4804/// ActOnParamDefaultArgument event for this parameter. 4805void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) { 4806 if (!ParamD) 4807 return; 4808 4809 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD); 4810 4811 // If this parameter has an unparsed default argument, clear it out 4812 // to make way for the parsed default argument. 4813 if (Param->hasUnparsedDefaultArg()) 4814 Param->setDefaultArg(0); 4815 4816 S->AddDecl(Param); 4817 if (Param->getDeclName()) 4818 IdResolver.AddDecl(Param); 4819} 4820 4821/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 4822/// processing the delayed method declaration for Method. The method 4823/// declaration is now considered finished. There may be a separate 4824/// ActOnStartOfFunctionDef action later (not necessarily 4825/// immediately!) for this method, if it was also defined inside the 4826/// class body. 4827void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 4828 if (!MethodD) 4829 return; 4830 4831 AdjustDeclIfTemplate(MethodD); 4832 4833 FunctionDecl *Method = cast<FunctionDecl>(MethodD); 4834 4835 // Now that we have our default arguments, check the constructor 4836 // again. It could produce additional diagnostics or affect whether 4837 // the class has implicitly-declared destructors, among other 4838 // things. 4839 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 4840 CheckConstructor(Constructor); 4841 4842 // Check the default arguments, which we may have added. 4843 if (!Method->isInvalidDecl()) 4844 CheckCXXDefaultArguments(Method); 4845} 4846 4847/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 4848/// the well-formedness of the constructor declarator @p D with type @p 4849/// R. If there are any errors in the declarator, this routine will 4850/// emit diagnostics and set the invalid bit to true. In any case, the type 4851/// will be updated to reflect a well-formed type for the constructor and 4852/// returned. 4853QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 4854 StorageClass &SC) { 4855 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 4856 4857 // C++ [class.ctor]p3: 4858 // A constructor shall not be virtual (10.3) or static (9.4). A 4859 // constructor can be invoked for a const, volatile or const 4860 // volatile object. A constructor shall not be declared const, 4861 // volatile, or const volatile (9.3.2). 4862 if (isVirtual) { 4863 if (!D.isInvalidType()) 4864 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 4865 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 4866 << SourceRange(D.getIdentifierLoc()); 4867 D.setInvalidType(); 4868 } 4869 if (SC == SC_Static) { 4870 if (!D.isInvalidType()) 4871 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 4872 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 4873 << SourceRange(D.getIdentifierLoc()); 4874 D.setInvalidType(); 4875 SC = SC_None; 4876 } 4877 4878 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 4879 if (FTI.TypeQuals != 0) { 4880 if (FTI.TypeQuals & Qualifiers::Const) 4881 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 4882 << "const" << SourceRange(D.getIdentifierLoc()); 4883 if (FTI.TypeQuals & Qualifiers::Volatile) 4884 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 4885 << "volatile" << SourceRange(D.getIdentifierLoc()); 4886 if (FTI.TypeQuals & Qualifiers::Restrict) 4887 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 4888 << "restrict" << SourceRange(D.getIdentifierLoc()); 4889 D.setInvalidType(); 4890 } 4891 4892 // C++0x [class.ctor]p4: 4893 // A constructor shall not be declared with a ref-qualifier. 4894 if (FTI.hasRefQualifier()) { 4895 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_constructor) 4896 << FTI.RefQualifierIsLValueRef 4897 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 4898 D.setInvalidType(); 4899 } 4900 4901 // Rebuild the function type "R" without any type qualifiers (in 4902 // case any of the errors above fired) and with "void" as the 4903 // return type, since constructors don't have return types. 4904 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 4905 if (Proto->getResultType() == Context.VoidTy && !D.isInvalidType()) 4906 return R; 4907 4908 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 4909 EPI.TypeQuals = 0; 4910 EPI.RefQualifier = RQ_None; 4911 4912 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 4913 Proto->getNumArgs(), EPI); 4914} 4915 4916/// CheckConstructor - Checks a fully-formed constructor for 4917/// well-formedness, issuing any diagnostics required. Returns true if 4918/// the constructor declarator is invalid. 4919void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 4920 CXXRecordDecl *ClassDecl 4921 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 4922 if (!ClassDecl) 4923 return Constructor->setInvalidDecl(); 4924 4925 // C++ [class.copy]p3: 4926 // A declaration of a constructor for a class X is ill-formed if 4927 // its first parameter is of type (optionally cv-qualified) X and 4928 // either there are no other parameters or else all other 4929 // parameters have default arguments. 4930 if (!Constructor->isInvalidDecl() && 4931 ((Constructor->getNumParams() == 1) || 4932 (Constructor->getNumParams() > 1 && 4933 Constructor->getParamDecl(1)->hasDefaultArg())) && 4934 Constructor->getTemplateSpecializationKind() 4935 != TSK_ImplicitInstantiation) { 4936 QualType ParamType = Constructor->getParamDecl(0)->getType(); 4937 QualType ClassTy = Context.getTagDeclType(ClassDecl); 4938 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 4939 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 4940 const char *ConstRef 4941 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 4942 : " const &"; 4943 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 4944 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 4945 4946 // FIXME: Rather that making the constructor invalid, we should endeavor 4947 // to fix the type. 4948 Constructor->setInvalidDecl(); 4949 } 4950 } 4951} 4952 4953/// CheckDestructor - Checks a fully-formed destructor definition for 4954/// well-formedness, issuing any diagnostics required. Returns true 4955/// on error. 4956bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 4957 CXXRecordDecl *RD = Destructor->getParent(); 4958 4959 if (Destructor->isVirtual()) { 4960 SourceLocation Loc; 4961 4962 if (!Destructor->isImplicit()) 4963 Loc = Destructor->getLocation(); 4964 else 4965 Loc = RD->getLocation(); 4966 4967 // If we have a virtual destructor, look up the deallocation function 4968 FunctionDecl *OperatorDelete = 0; 4969 DeclarationName Name = 4970 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 4971 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 4972 return true; 4973 4974 MarkFunctionReferenced(Loc, OperatorDelete); 4975 4976 Destructor->setOperatorDelete(OperatorDelete); 4977 } 4978 4979 return false; 4980} 4981 4982static inline bool 4983FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 4984 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 4985 FTI.ArgInfo[0].Param && 4986 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()); 4987} 4988 4989/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 4990/// the well-formednes of the destructor declarator @p D with type @p 4991/// R. If there are any errors in the declarator, this routine will 4992/// emit diagnostics and set the declarator to invalid. Even if this happens, 4993/// will be updated to reflect a well-formed type for the destructor and 4994/// returned. 4995QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, 4996 StorageClass& SC) { 4997 // C++ [class.dtor]p1: 4998 // [...] A typedef-name that names a class is a class-name 4999 // (7.1.3); however, a typedef-name that names a class shall not 5000 // be used as the identifier in the declarator for a destructor 5001 // declaration. 5002 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 5003 if (const TypedefType *TT = DeclaratorType->getAs<TypedefType>()) 5004 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 5005 << DeclaratorType << isa<TypeAliasDecl>(TT->getDecl()); 5006 else if (const TemplateSpecializationType *TST = 5007 DeclaratorType->getAs<TemplateSpecializationType>()) 5008 if (TST->isTypeAlias()) 5009 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 5010 << DeclaratorType << 1; 5011 5012 // C++ [class.dtor]p2: 5013 // A destructor is used to destroy objects of its class type. A 5014 // destructor takes no parameters, and no return type can be 5015 // specified for it (not even void). The address of a destructor 5016 // shall not be taken. A destructor shall not be static. A 5017 // destructor can be invoked for a const, volatile or const 5018 // volatile object. A destructor shall not be declared const, 5019 // volatile or const volatile (9.3.2). 5020 if (SC == SC_Static) { 5021 if (!D.isInvalidType()) 5022 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 5023 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5024 << SourceRange(D.getIdentifierLoc()) 5025 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 5026 5027 SC = SC_None; 5028 } 5029 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 5030 // Destructors don't have return types, but the parser will 5031 // happily parse something like: 5032 // 5033 // class X { 5034 // float ~X(); 5035 // }; 5036 // 5037 // The return type will be eliminated later. 5038 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 5039 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 5040 << SourceRange(D.getIdentifierLoc()); 5041 } 5042 5043 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5044 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 5045 if (FTI.TypeQuals & Qualifiers::Const) 5046 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5047 << "const" << SourceRange(D.getIdentifierLoc()); 5048 if (FTI.TypeQuals & Qualifiers::Volatile) 5049 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5050 << "volatile" << SourceRange(D.getIdentifierLoc()); 5051 if (FTI.TypeQuals & Qualifiers::Restrict) 5052 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5053 << "restrict" << SourceRange(D.getIdentifierLoc()); 5054 D.setInvalidType(); 5055 } 5056 5057 // C++0x [class.dtor]p2: 5058 // A destructor shall not be declared with a ref-qualifier. 5059 if (FTI.hasRefQualifier()) { 5060 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_destructor) 5061 << FTI.RefQualifierIsLValueRef 5062 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 5063 D.setInvalidType(); 5064 } 5065 5066 // Make sure we don't have any parameters. 5067 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 5068 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 5069 5070 // Delete the parameters. 5071 FTI.freeArgs(); 5072 D.setInvalidType(); 5073 } 5074 5075 // Make sure the destructor isn't variadic. 5076 if (FTI.isVariadic) { 5077 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 5078 D.setInvalidType(); 5079 } 5080 5081 // Rebuild the function type "R" without any type qualifiers or 5082 // parameters (in case any of the errors above fired) and with 5083 // "void" as the return type, since destructors don't have return 5084 // types. 5085 if (!D.isInvalidType()) 5086 return R; 5087 5088 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5089 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 5090 EPI.Variadic = false; 5091 EPI.TypeQuals = 0; 5092 EPI.RefQualifier = RQ_None; 5093 return Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 5094} 5095 5096/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 5097/// well-formednes of the conversion function declarator @p D with 5098/// type @p R. If there are any errors in the declarator, this routine 5099/// will emit diagnostics and return true. Otherwise, it will return 5100/// false. Either way, the type @p R will be updated to reflect a 5101/// well-formed type for the conversion operator. 5102void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 5103 StorageClass& SC) { 5104 // C++ [class.conv.fct]p1: 5105 // Neither parameter types nor return type can be specified. The 5106 // type of a conversion function (8.3.5) is "function taking no 5107 // parameter returning conversion-type-id." 5108 if (SC == SC_Static) { 5109 if (!D.isInvalidType()) 5110 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 5111 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5112 << SourceRange(D.getIdentifierLoc()); 5113 D.setInvalidType(); 5114 SC = SC_None; 5115 } 5116 5117 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 5118 5119 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 5120 // Conversion functions don't have return types, but the parser will 5121 // happily parse something like: 5122 // 5123 // class X { 5124 // float operator bool(); 5125 // }; 5126 // 5127 // The return type will be changed later anyway. 5128 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 5129 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 5130 << SourceRange(D.getIdentifierLoc()); 5131 D.setInvalidType(); 5132 } 5133 5134 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5135 5136 // Make sure we don't have any parameters. 5137 if (Proto->getNumArgs() > 0) { 5138 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 5139 5140 // Delete the parameters. 5141 D.getFunctionTypeInfo().freeArgs(); 5142 D.setInvalidType(); 5143 } else if (Proto->isVariadic()) { 5144 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 5145 D.setInvalidType(); 5146 } 5147 5148 // Diagnose "&operator bool()" and other such nonsense. This 5149 // is actually a gcc extension which we don't support. 5150 if (Proto->getResultType() != ConvType) { 5151 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 5152 << Proto->getResultType(); 5153 D.setInvalidType(); 5154 ConvType = Proto->getResultType(); 5155 } 5156 5157 // C++ [class.conv.fct]p4: 5158 // The conversion-type-id shall not represent a function type nor 5159 // an array type. 5160 if (ConvType->isArrayType()) { 5161 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 5162 ConvType = Context.getPointerType(ConvType); 5163 D.setInvalidType(); 5164 } else if (ConvType->isFunctionType()) { 5165 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 5166 ConvType = Context.getPointerType(ConvType); 5167 D.setInvalidType(); 5168 } 5169 5170 // Rebuild the function type "R" without any parameters (in case any 5171 // of the errors above fired) and with the conversion type as the 5172 // return type. 5173 if (D.isInvalidType()) 5174 R = Context.getFunctionType(ConvType, 0, 0, Proto->getExtProtoInfo()); 5175 5176 // C++0x explicit conversion operators. 5177 if (D.getDeclSpec().isExplicitSpecified()) 5178 Diag(D.getDeclSpec().getExplicitSpecLoc(), 5179 getLangOpts().CPlusPlus0x ? 5180 diag::warn_cxx98_compat_explicit_conversion_functions : 5181 diag::ext_explicit_conversion_functions) 5182 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 5183} 5184 5185/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 5186/// the declaration of the given C++ conversion function. This routine 5187/// is responsible for recording the conversion function in the C++ 5188/// class, if possible. 5189Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 5190 assert(Conversion && "Expected to receive a conversion function declaration"); 5191 5192 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 5193 5194 // Make sure we aren't redeclaring the conversion function. 5195 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 5196 5197 // C++ [class.conv.fct]p1: 5198 // [...] A conversion function is never used to convert a 5199 // (possibly cv-qualified) object to the (possibly cv-qualified) 5200 // same object type (or a reference to it), to a (possibly 5201 // cv-qualified) base class of that type (or a reference to it), 5202 // or to (possibly cv-qualified) void. 5203 // FIXME: Suppress this warning if the conversion function ends up being a 5204 // virtual function that overrides a virtual function in a base class. 5205 QualType ClassType 5206 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 5207 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 5208 ConvType = ConvTypeRef->getPointeeType(); 5209 if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared && 5210 Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) 5211 /* Suppress diagnostics for instantiations. */; 5212 else if (ConvType->isRecordType()) { 5213 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 5214 if (ConvType == ClassType) 5215 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 5216 << ClassType; 5217 else if (IsDerivedFrom(ClassType, ConvType)) 5218 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 5219 << ClassType << ConvType; 5220 } else if (ConvType->isVoidType()) { 5221 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 5222 << ClassType << ConvType; 5223 } 5224 5225 if (FunctionTemplateDecl *ConversionTemplate 5226 = Conversion->getDescribedFunctionTemplate()) 5227 return ConversionTemplate; 5228 5229 return Conversion; 5230} 5231 5232//===----------------------------------------------------------------------===// 5233// Namespace Handling 5234//===----------------------------------------------------------------------===// 5235 5236 5237 5238/// ActOnStartNamespaceDef - This is called at the start of a namespace 5239/// definition. 5240Decl *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 5241 SourceLocation InlineLoc, 5242 SourceLocation NamespaceLoc, 5243 SourceLocation IdentLoc, 5244 IdentifierInfo *II, 5245 SourceLocation LBrace, 5246 AttributeList *AttrList) { 5247 SourceLocation StartLoc = InlineLoc.isValid() ? InlineLoc : NamespaceLoc; 5248 // For anonymous namespace, take the location of the left brace. 5249 SourceLocation Loc = II ? IdentLoc : LBrace; 5250 bool IsInline = InlineLoc.isValid(); 5251 bool IsInvalid = false; 5252 bool IsStd = false; 5253 bool AddToKnown = false; 5254 Scope *DeclRegionScope = NamespcScope->getParent(); 5255 5256 NamespaceDecl *PrevNS = 0; 5257 if (II) { 5258 // C++ [namespace.def]p2: 5259 // The identifier in an original-namespace-definition shall not 5260 // have been previously defined in the declarative region in 5261 // which the original-namespace-definition appears. The 5262 // identifier in an original-namespace-definition is the name of 5263 // the namespace. Subsequently in that declarative region, it is 5264 // treated as an original-namespace-name. 5265 // 5266 // Since namespace names are unique in their scope, and we don't 5267 // look through using directives, just look for any ordinary names. 5268 5269 const unsigned IDNS = Decl::IDNS_Ordinary | Decl::IDNS_Member | 5270 Decl::IDNS_Type | Decl::IDNS_Using | Decl::IDNS_Tag | 5271 Decl::IDNS_Namespace; 5272 NamedDecl *PrevDecl = 0; 5273 for (DeclContext::lookup_result R 5274 = CurContext->getRedeclContext()->lookup(II); 5275 R.first != R.second; ++R.first) { 5276 if ((*R.first)->getIdentifierNamespace() & IDNS) { 5277 PrevDecl = *R.first; 5278 break; 5279 } 5280 } 5281 5282 PrevNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl); 5283 5284 if (PrevNS) { 5285 // This is an extended namespace definition. 5286 if (IsInline != PrevNS->isInline()) { 5287 // inline-ness must match 5288 if (PrevNS->isInline()) { 5289 // The user probably just forgot the 'inline', so suggest that it 5290 // be added back. 5291 Diag(Loc, diag::warn_inline_namespace_reopened_noninline) 5292 << FixItHint::CreateInsertion(NamespaceLoc, "inline "); 5293 } else { 5294 Diag(Loc, diag::err_inline_namespace_mismatch) 5295 << IsInline; 5296 } 5297 Diag(PrevNS->getLocation(), diag::note_previous_definition); 5298 5299 IsInline = PrevNS->isInline(); 5300 } 5301 } else if (PrevDecl) { 5302 // This is an invalid name redefinition. 5303 Diag(Loc, diag::err_redefinition_different_kind) 5304 << II; 5305 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 5306 IsInvalid = true; 5307 // Continue on to push Namespc as current DeclContext and return it. 5308 } else if (II->isStr("std") && 5309 CurContext->getRedeclContext()->isTranslationUnit()) { 5310 // This is the first "real" definition of the namespace "std", so update 5311 // our cache of the "std" namespace to point at this definition. 5312 PrevNS = getStdNamespace(); 5313 IsStd = true; 5314 AddToKnown = !IsInline; 5315 } else { 5316 // We've seen this namespace for the first time. 5317 AddToKnown = !IsInline; 5318 } 5319 } else { 5320 // Anonymous namespaces. 5321 5322 // Determine whether the parent already has an anonymous namespace. 5323 DeclContext *Parent = CurContext->getRedeclContext(); 5324 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 5325 PrevNS = TU->getAnonymousNamespace(); 5326 } else { 5327 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 5328 PrevNS = ND->getAnonymousNamespace(); 5329 } 5330 5331 if (PrevNS && IsInline != PrevNS->isInline()) { 5332 // inline-ness must match 5333 Diag(Loc, diag::err_inline_namespace_mismatch) 5334 << IsInline; 5335 Diag(PrevNS->getLocation(), diag::note_previous_definition); 5336 5337 // Recover by ignoring the new namespace's inline status. 5338 IsInline = PrevNS->isInline(); 5339 } 5340 } 5341 5342 NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, IsInline, 5343 StartLoc, Loc, II, PrevNS); 5344 if (IsInvalid) 5345 Namespc->setInvalidDecl(); 5346 5347 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 5348 5349 // FIXME: Should we be merging attributes? 5350 if (const VisibilityAttr *Attr = Namespc->getAttr<VisibilityAttr>()) 5351 PushNamespaceVisibilityAttr(Attr, Loc); 5352 5353 if (IsStd) 5354 StdNamespace = Namespc; 5355 if (AddToKnown) 5356 KnownNamespaces[Namespc] = false; 5357 5358 if (II) { 5359 PushOnScopeChains(Namespc, DeclRegionScope); 5360 } else { 5361 // Link the anonymous namespace into its parent. 5362 DeclContext *Parent = CurContext->getRedeclContext(); 5363 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 5364 TU->setAnonymousNamespace(Namespc); 5365 } else { 5366 cast<NamespaceDecl>(Parent)->setAnonymousNamespace(Namespc); 5367 } 5368 5369 CurContext->addDecl(Namespc); 5370 5371 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 5372 // behaves as if it were replaced by 5373 // namespace unique { /* empty body */ } 5374 // using namespace unique; 5375 // namespace unique { namespace-body } 5376 // where all occurrences of 'unique' in a translation unit are 5377 // replaced by the same identifier and this identifier differs 5378 // from all other identifiers in the entire program. 5379 5380 // We just create the namespace with an empty name and then add an 5381 // implicit using declaration, just like the standard suggests. 5382 // 5383 // CodeGen enforces the "universally unique" aspect by giving all 5384 // declarations semantically contained within an anonymous 5385 // namespace internal linkage. 5386 5387 if (!PrevNS) { 5388 UsingDirectiveDecl* UD 5389 = UsingDirectiveDecl::Create(Context, CurContext, 5390 /* 'using' */ LBrace, 5391 /* 'namespace' */ SourceLocation(), 5392 /* qualifier */ NestedNameSpecifierLoc(), 5393 /* identifier */ SourceLocation(), 5394 Namespc, 5395 /* Ancestor */ CurContext); 5396 UD->setImplicit(); 5397 CurContext->addDecl(UD); 5398 } 5399 } 5400 5401 // Although we could have an invalid decl (i.e. the namespace name is a 5402 // redefinition), push it as current DeclContext and try to continue parsing. 5403 // FIXME: We should be able to push Namespc here, so that the each DeclContext 5404 // for the namespace has the declarations that showed up in that particular 5405 // namespace definition. 5406 PushDeclContext(NamespcScope, Namespc); 5407 return Namespc; 5408} 5409 5410/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 5411/// is a namespace alias, returns the namespace it points to. 5412static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 5413 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 5414 return AD->getNamespace(); 5415 return dyn_cast_or_null<NamespaceDecl>(D); 5416} 5417 5418/// ActOnFinishNamespaceDef - This callback is called after a namespace is 5419/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 5420void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) { 5421 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 5422 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 5423 Namespc->setRBraceLoc(RBrace); 5424 PopDeclContext(); 5425 if (Namespc->hasAttr<VisibilityAttr>()) 5426 PopPragmaVisibility(true, RBrace); 5427} 5428 5429CXXRecordDecl *Sema::getStdBadAlloc() const { 5430 return cast_or_null<CXXRecordDecl>( 5431 StdBadAlloc.get(Context.getExternalSource())); 5432} 5433 5434NamespaceDecl *Sema::getStdNamespace() const { 5435 return cast_or_null<NamespaceDecl>( 5436 StdNamespace.get(Context.getExternalSource())); 5437} 5438 5439/// \brief Retrieve the special "std" namespace, which may require us to 5440/// implicitly define the namespace. 5441NamespaceDecl *Sema::getOrCreateStdNamespace() { 5442 if (!StdNamespace) { 5443 // The "std" namespace has not yet been defined, so build one implicitly. 5444 StdNamespace = NamespaceDecl::Create(Context, 5445 Context.getTranslationUnitDecl(), 5446 /*Inline=*/false, 5447 SourceLocation(), SourceLocation(), 5448 &PP.getIdentifierTable().get("std"), 5449 /*PrevDecl=*/0); 5450 getStdNamespace()->setImplicit(true); 5451 } 5452 5453 return getStdNamespace(); 5454} 5455 5456bool Sema::isStdInitializerList(QualType Ty, QualType *Element) { 5457 assert(getLangOpts().CPlusPlus && 5458 "Looking for std::initializer_list outside of C++."); 5459 5460 // We're looking for implicit instantiations of 5461 // template <typename E> class std::initializer_list. 5462 5463 if (!StdNamespace) // If we haven't seen namespace std yet, this can't be it. 5464 return false; 5465 5466 ClassTemplateDecl *Template = 0; 5467 const TemplateArgument *Arguments = 0; 5468 5469 if (const RecordType *RT = Ty->getAs<RecordType>()) { 5470 5471 ClassTemplateSpecializationDecl *Specialization = 5472 dyn_cast<ClassTemplateSpecializationDecl>(RT->getDecl()); 5473 if (!Specialization) 5474 return false; 5475 5476 Template = Specialization->getSpecializedTemplate(); 5477 Arguments = Specialization->getTemplateArgs().data(); 5478 } else if (const TemplateSpecializationType *TST = 5479 Ty->getAs<TemplateSpecializationType>()) { 5480 Template = dyn_cast_or_null<ClassTemplateDecl>( 5481 TST->getTemplateName().getAsTemplateDecl()); 5482 Arguments = TST->getArgs(); 5483 } 5484 if (!Template) 5485 return false; 5486 5487 if (!StdInitializerList) { 5488 // Haven't recognized std::initializer_list yet, maybe this is it. 5489 CXXRecordDecl *TemplateClass = Template->getTemplatedDecl(); 5490 if (TemplateClass->getIdentifier() != 5491 &PP.getIdentifierTable().get("initializer_list") || 5492 !getStdNamespace()->InEnclosingNamespaceSetOf( 5493 TemplateClass->getDeclContext())) 5494 return false; 5495 // This is a template called std::initializer_list, but is it the right 5496 // template? 5497 TemplateParameterList *Params = Template->getTemplateParameters(); 5498 if (Params->getMinRequiredArguments() != 1) 5499 return false; 5500 if (!isa<TemplateTypeParmDecl>(Params->getParam(0))) 5501 return false; 5502 5503 // It's the right template. 5504 StdInitializerList = Template; 5505 } 5506 5507 if (Template != StdInitializerList) 5508 return false; 5509 5510 // This is an instance of std::initializer_list. Find the argument type. 5511 if (Element) 5512 *Element = Arguments[0].getAsType(); 5513 return true; 5514} 5515 5516static ClassTemplateDecl *LookupStdInitializerList(Sema &S, SourceLocation Loc){ 5517 NamespaceDecl *Std = S.getStdNamespace(); 5518 if (!Std) { 5519 S.Diag(Loc, diag::err_implied_std_initializer_list_not_found); 5520 return 0; 5521 } 5522 5523 LookupResult Result(S, &S.PP.getIdentifierTable().get("initializer_list"), 5524 Loc, Sema::LookupOrdinaryName); 5525 if (!S.LookupQualifiedName(Result, Std)) { 5526 S.Diag(Loc, diag::err_implied_std_initializer_list_not_found); 5527 return 0; 5528 } 5529 ClassTemplateDecl *Template = Result.getAsSingle<ClassTemplateDecl>(); 5530 if (!Template) { 5531 Result.suppressDiagnostics(); 5532 // We found something weird. Complain about the first thing we found. 5533 NamedDecl *Found = *Result.begin(); 5534 S.Diag(Found->getLocation(), diag::err_malformed_std_initializer_list); 5535 return 0; 5536 } 5537 5538 // We found some template called std::initializer_list. Now verify that it's 5539 // correct. 5540 TemplateParameterList *Params = Template->getTemplateParameters(); 5541 if (Params->getMinRequiredArguments() != 1 || 5542 !isa<TemplateTypeParmDecl>(Params->getParam(0))) { 5543 S.Diag(Template->getLocation(), diag::err_malformed_std_initializer_list); 5544 return 0; 5545 } 5546 5547 return Template; 5548} 5549 5550QualType Sema::BuildStdInitializerList(QualType Element, SourceLocation Loc) { 5551 if (!StdInitializerList) { 5552 StdInitializerList = LookupStdInitializerList(*this, Loc); 5553 if (!StdInitializerList) 5554 return QualType(); 5555 } 5556 5557 TemplateArgumentListInfo Args(Loc, Loc); 5558 Args.addArgument(TemplateArgumentLoc(TemplateArgument(Element), 5559 Context.getTrivialTypeSourceInfo(Element, 5560 Loc))); 5561 return Context.getCanonicalType( 5562 CheckTemplateIdType(TemplateName(StdInitializerList), Loc, Args)); 5563} 5564 5565bool Sema::isInitListConstructor(const CXXConstructorDecl* Ctor) { 5566 // C++ [dcl.init.list]p2: 5567 // A constructor is an initializer-list constructor if its first parameter 5568 // is of type std::initializer_list<E> or reference to possibly cv-qualified 5569 // std::initializer_list<E> for some type E, and either there are no other 5570 // parameters or else all other parameters have default arguments. 5571 if (Ctor->getNumParams() < 1 || 5572 (Ctor->getNumParams() > 1 && !Ctor->getParamDecl(1)->hasDefaultArg())) 5573 return false; 5574 5575 QualType ArgType = Ctor->getParamDecl(0)->getType(); 5576 if (const ReferenceType *RT = ArgType->getAs<ReferenceType>()) 5577 ArgType = RT->getPointeeType().getUnqualifiedType(); 5578 5579 return isStdInitializerList(ArgType, 0); 5580} 5581 5582/// \brief Determine whether a using statement is in a context where it will be 5583/// apply in all contexts. 5584static bool IsUsingDirectiveInToplevelContext(DeclContext *CurContext) { 5585 switch (CurContext->getDeclKind()) { 5586 case Decl::TranslationUnit: 5587 return true; 5588 case Decl::LinkageSpec: 5589 return IsUsingDirectiveInToplevelContext(CurContext->getParent()); 5590 default: 5591 return false; 5592 } 5593} 5594 5595namespace { 5596 5597// Callback to only accept typo corrections that are namespaces. 5598class NamespaceValidatorCCC : public CorrectionCandidateCallback { 5599 public: 5600 virtual bool ValidateCandidate(const TypoCorrection &candidate) { 5601 if (NamedDecl *ND = candidate.getCorrectionDecl()) { 5602 return isa<NamespaceDecl>(ND) || isa<NamespaceAliasDecl>(ND); 5603 } 5604 return false; 5605 } 5606}; 5607 5608} 5609 5610static bool TryNamespaceTypoCorrection(Sema &S, LookupResult &R, Scope *Sc, 5611 CXXScopeSpec &SS, 5612 SourceLocation IdentLoc, 5613 IdentifierInfo *Ident) { 5614 NamespaceValidatorCCC Validator; 5615 R.clear(); 5616 if (TypoCorrection Corrected = S.CorrectTypo(R.getLookupNameInfo(), 5617 R.getLookupKind(), Sc, &SS, 5618 Validator)) { 5619 std::string CorrectedStr(Corrected.getAsString(S.getLangOpts())); 5620 std::string CorrectedQuotedStr(Corrected.getQuoted(S.getLangOpts())); 5621 if (DeclContext *DC = S.computeDeclContext(SS, false)) 5622 S.Diag(IdentLoc, diag::err_using_directive_member_suggest) 5623 << Ident << DC << CorrectedQuotedStr << SS.getRange() 5624 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr); 5625 else 5626 S.Diag(IdentLoc, diag::err_using_directive_suggest) 5627 << Ident << CorrectedQuotedStr 5628 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr); 5629 5630 S.Diag(Corrected.getCorrectionDecl()->getLocation(), 5631 diag::note_namespace_defined_here) << CorrectedQuotedStr; 5632 5633 R.addDecl(Corrected.getCorrectionDecl()); 5634 return true; 5635 } 5636 return false; 5637} 5638 5639Decl *Sema::ActOnUsingDirective(Scope *S, 5640 SourceLocation UsingLoc, 5641 SourceLocation NamespcLoc, 5642 CXXScopeSpec &SS, 5643 SourceLocation IdentLoc, 5644 IdentifierInfo *NamespcName, 5645 AttributeList *AttrList) { 5646 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 5647 assert(NamespcName && "Invalid NamespcName."); 5648 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 5649 5650 // This can only happen along a recovery path. 5651 while (S->getFlags() & Scope::TemplateParamScope) 5652 S = S->getParent(); 5653 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 5654 5655 UsingDirectiveDecl *UDir = 0; 5656 NestedNameSpecifier *Qualifier = 0; 5657 if (SS.isSet()) 5658 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 5659 5660 // Lookup namespace name. 5661 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 5662 LookupParsedName(R, S, &SS); 5663 if (R.isAmbiguous()) 5664 return 0; 5665 5666 if (R.empty()) { 5667 R.clear(); 5668 // Allow "using namespace std;" or "using namespace ::std;" even if 5669 // "std" hasn't been defined yet, for GCC compatibility. 5670 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 5671 NamespcName->isStr("std")) { 5672 Diag(IdentLoc, diag::ext_using_undefined_std); 5673 R.addDecl(getOrCreateStdNamespace()); 5674 R.resolveKind(); 5675 } 5676 // Otherwise, attempt typo correction. 5677 else TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, NamespcName); 5678 } 5679 5680 if (!R.empty()) { 5681 NamedDecl *Named = R.getFoundDecl(); 5682 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 5683 && "expected namespace decl"); 5684 // C++ [namespace.udir]p1: 5685 // A using-directive specifies that the names in the nominated 5686 // namespace can be used in the scope in which the 5687 // using-directive appears after the using-directive. During 5688 // unqualified name lookup (3.4.1), the names appear as if they 5689 // were declared in the nearest enclosing namespace which 5690 // contains both the using-directive and the nominated 5691 // namespace. [Note: in this context, "contains" means "contains 5692 // directly or indirectly". ] 5693 5694 // Find enclosing context containing both using-directive and 5695 // nominated namespace. 5696 NamespaceDecl *NS = getNamespaceDecl(Named); 5697 DeclContext *CommonAncestor = cast<DeclContext>(NS); 5698 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 5699 CommonAncestor = CommonAncestor->getParent(); 5700 5701 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 5702 SS.getWithLocInContext(Context), 5703 IdentLoc, Named, CommonAncestor); 5704 5705 if (IsUsingDirectiveInToplevelContext(CurContext) && 5706 !SourceMgr.isFromMainFile(SourceMgr.getExpansionLoc(IdentLoc))) { 5707 Diag(IdentLoc, diag::warn_using_directive_in_header); 5708 } 5709 5710 PushUsingDirective(S, UDir); 5711 } else { 5712 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 5713 } 5714 5715 // FIXME: We ignore attributes for now. 5716 return UDir; 5717} 5718 5719void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 5720 // If the scope has an associated entity and the using directive is at 5721 // namespace or translation unit scope, add the UsingDirectiveDecl into 5722 // its lookup structure so qualified name lookup can find it. 5723 DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity()); 5724 if (Ctx && !Ctx->isFunctionOrMethod()) 5725 Ctx->addDecl(UDir); 5726 else 5727 // Otherwise, it is at block sope. The using-directives will affect lookup 5728 // only to the end of the scope. 5729 S->PushUsingDirective(UDir); 5730} 5731 5732 5733Decl *Sema::ActOnUsingDeclaration(Scope *S, 5734 AccessSpecifier AS, 5735 bool HasUsingKeyword, 5736 SourceLocation UsingLoc, 5737 CXXScopeSpec &SS, 5738 UnqualifiedId &Name, 5739 AttributeList *AttrList, 5740 bool IsTypeName, 5741 SourceLocation TypenameLoc) { 5742 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 5743 5744 switch (Name.getKind()) { 5745 case UnqualifiedId::IK_ImplicitSelfParam: 5746 case UnqualifiedId::IK_Identifier: 5747 case UnqualifiedId::IK_OperatorFunctionId: 5748 case UnqualifiedId::IK_LiteralOperatorId: 5749 case UnqualifiedId::IK_ConversionFunctionId: 5750 break; 5751 5752 case UnqualifiedId::IK_ConstructorName: 5753 case UnqualifiedId::IK_ConstructorTemplateId: 5754 // C++11 inheriting constructors. 5755 Diag(Name.getLocStart(), 5756 getLangOpts().CPlusPlus0x ? 5757 // FIXME: Produce warn_cxx98_compat_using_decl_constructor 5758 // instead once inheriting constructors work. 5759 diag::err_using_decl_constructor_unsupported : 5760 diag::err_using_decl_constructor) 5761 << SS.getRange(); 5762 5763 if (getLangOpts().CPlusPlus0x) break; 5764 5765 return 0; 5766 5767 case UnqualifiedId::IK_DestructorName: 5768 Diag(Name.getLocStart(), diag::err_using_decl_destructor) 5769 << SS.getRange(); 5770 return 0; 5771 5772 case UnqualifiedId::IK_TemplateId: 5773 Diag(Name.getLocStart(), diag::err_using_decl_template_id) 5774 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 5775 return 0; 5776 } 5777 5778 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name); 5779 DeclarationName TargetName = TargetNameInfo.getName(); 5780 if (!TargetName) 5781 return 0; 5782 5783 // Warn about using declarations. 5784 // TODO: store that the declaration was written without 'using' and 5785 // talk about access decls instead of using decls in the 5786 // diagnostics. 5787 if (!HasUsingKeyword) { 5788 UsingLoc = Name.getLocStart(); 5789 5790 Diag(UsingLoc, diag::warn_access_decl_deprecated) 5791 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 5792 } 5793 5794 if (DiagnoseUnexpandedParameterPack(SS, UPPC_UsingDeclaration) || 5795 DiagnoseUnexpandedParameterPack(TargetNameInfo, UPPC_UsingDeclaration)) 5796 return 0; 5797 5798 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 5799 TargetNameInfo, AttrList, 5800 /* IsInstantiation */ false, 5801 IsTypeName, TypenameLoc); 5802 if (UD) 5803 PushOnScopeChains(UD, S, /*AddToContext*/ false); 5804 5805 return UD; 5806} 5807 5808/// \brief Determine whether a using declaration considers the given 5809/// declarations as "equivalent", e.g., if they are redeclarations of 5810/// the same entity or are both typedefs of the same type. 5811static bool 5812IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2, 5813 bool &SuppressRedeclaration) { 5814 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) { 5815 SuppressRedeclaration = false; 5816 return true; 5817 } 5818 5819 if (TypedefNameDecl *TD1 = dyn_cast<TypedefNameDecl>(D1)) 5820 if (TypedefNameDecl *TD2 = dyn_cast<TypedefNameDecl>(D2)) { 5821 SuppressRedeclaration = true; 5822 return Context.hasSameType(TD1->getUnderlyingType(), 5823 TD2->getUnderlyingType()); 5824 } 5825 5826 return false; 5827} 5828 5829 5830/// Determines whether to create a using shadow decl for a particular 5831/// decl, given the set of decls existing prior to this using lookup. 5832bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 5833 const LookupResult &Previous) { 5834 // Diagnose finding a decl which is not from a base class of the 5835 // current class. We do this now because there are cases where this 5836 // function will silently decide not to build a shadow decl, which 5837 // will pre-empt further diagnostics. 5838 // 5839 // We don't need to do this in C++0x because we do the check once on 5840 // the qualifier. 5841 // 5842 // FIXME: diagnose the following if we care enough: 5843 // struct A { int foo; }; 5844 // struct B : A { using A::foo; }; 5845 // template <class T> struct C : A {}; 5846 // template <class T> struct D : C<T> { using B::foo; } // <--- 5847 // This is invalid (during instantiation) in C++03 because B::foo 5848 // resolves to the using decl in B, which is not a base class of D<T>. 5849 // We can't diagnose it immediately because C<T> is an unknown 5850 // specialization. The UsingShadowDecl in D<T> then points directly 5851 // to A::foo, which will look well-formed when we instantiate. 5852 // The right solution is to not collapse the shadow-decl chain. 5853 if (!getLangOpts().CPlusPlus0x && CurContext->isRecord()) { 5854 DeclContext *OrigDC = Orig->getDeclContext(); 5855 5856 // Handle enums and anonymous structs. 5857 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 5858 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 5859 while (OrigRec->isAnonymousStructOrUnion()) 5860 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 5861 5862 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 5863 if (OrigDC == CurContext) { 5864 Diag(Using->getLocation(), 5865 diag::err_using_decl_nested_name_specifier_is_current_class) 5866 << Using->getQualifierLoc().getSourceRange(); 5867 Diag(Orig->getLocation(), diag::note_using_decl_target); 5868 return true; 5869 } 5870 5871 Diag(Using->getQualifierLoc().getBeginLoc(), 5872 diag::err_using_decl_nested_name_specifier_is_not_base_class) 5873 << Using->getQualifier() 5874 << cast<CXXRecordDecl>(CurContext) 5875 << Using->getQualifierLoc().getSourceRange(); 5876 Diag(Orig->getLocation(), diag::note_using_decl_target); 5877 return true; 5878 } 5879 } 5880 5881 if (Previous.empty()) return false; 5882 5883 NamedDecl *Target = Orig; 5884 if (isa<UsingShadowDecl>(Target)) 5885 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 5886 5887 // If the target happens to be one of the previous declarations, we 5888 // don't have a conflict. 5889 // 5890 // FIXME: but we might be increasing its access, in which case we 5891 // should redeclare it. 5892 NamedDecl *NonTag = 0, *Tag = 0; 5893 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 5894 I != E; ++I) { 5895 NamedDecl *D = (*I)->getUnderlyingDecl(); 5896 bool Result; 5897 if (IsEquivalentForUsingDecl(Context, D, Target, Result)) 5898 return Result; 5899 5900 (isa<TagDecl>(D) ? Tag : NonTag) = D; 5901 } 5902 5903 if (Target->isFunctionOrFunctionTemplate()) { 5904 FunctionDecl *FD; 5905 if (isa<FunctionTemplateDecl>(Target)) 5906 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 5907 else 5908 FD = cast<FunctionDecl>(Target); 5909 5910 NamedDecl *OldDecl = 0; 5911 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 5912 case Ovl_Overload: 5913 return false; 5914 5915 case Ovl_NonFunction: 5916 Diag(Using->getLocation(), diag::err_using_decl_conflict); 5917 break; 5918 5919 // We found a decl with the exact signature. 5920 case Ovl_Match: 5921 // If we're in a record, we want to hide the target, so we 5922 // return true (without a diagnostic) to tell the caller not to 5923 // build a shadow decl. 5924 if (CurContext->isRecord()) 5925 return true; 5926 5927 // If we're not in a record, this is an error. 5928 Diag(Using->getLocation(), diag::err_using_decl_conflict); 5929 break; 5930 } 5931 5932 Diag(Target->getLocation(), diag::note_using_decl_target); 5933 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 5934 return true; 5935 } 5936 5937 // Target is not a function. 5938 5939 if (isa<TagDecl>(Target)) { 5940 // No conflict between a tag and a non-tag. 5941 if (!Tag) return false; 5942 5943 Diag(Using->getLocation(), diag::err_using_decl_conflict); 5944 Diag(Target->getLocation(), diag::note_using_decl_target); 5945 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 5946 return true; 5947 } 5948 5949 // No conflict between a tag and a non-tag. 5950 if (!NonTag) return false; 5951 5952 Diag(Using->getLocation(), diag::err_using_decl_conflict); 5953 Diag(Target->getLocation(), diag::note_using_decl_target); 5954 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 5955 return true; 5956} 5957 5958/// Builds a shadow declaration corresponding to a 'using' declaration. 5959UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 5960 UsingDecl *UD, 5961 NamedDecl *Orig) { 5962 5963 // If we resolved to another shadow declaration, just coalesce them. 5964 NamedDecl *Target = Orig; 5965 if (isa<UsingShadowDecl>(Target)) { 5966 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 5967 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 5968 } 5969 5970 UsingShadowDecl *Shadow 5971 = UsingShadowDecl::Create(Context, CurContext, 5972 UD->getLocation(), UD, Target); 5973 UD->addShadowDecl(Shadow); 5974 5975 Shadow->setAccess(UD->getAccess()); 5976 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 5977 Shadow->setInvalidDecl(); 5978 5979 if (S) 5980 PushOnScopeChains(Shadow, S); 5981 else 5982 CurContext->addDecl(Shadow); 5983 5984 5985 return Shadow; 5986} 5987 5988/// Hides a using shadow declaration. This is required by the current 5989/// using-decl implementation when a resolvable using declaration in a 5990/// class is followed by a declaration which would hide or override 5991/// one or more of the using decl's targets; for example: 5992/// 5993/// struct Base { void foo(int); }; 5994/// struct Derived : Base { 5995/// using Base::foo; 5996/// void foo(int); 5997/// }; 5998/// 5999/// The governing language is C++03 [namespace.udecl]p12: 6000/// 6001/// When a using-declaration brings names from a base class into a 6002/// derived class scope, member functions in the derived class 6003/// override and/or hide member functions with the same name and 6004/// parameter types in a base class (rather than conflicting). 6005/// 6006/// There are two ways to implement this: 6007/// (1) optimistically create shadow decls when they're not hidden 6008/// by existing declarations, or 6009/// (2) don't create any shadow decls (or at least don't make them 6010/// visible) until we've fully parsed/instantiated the class. 6011/// The problem with (1) is that we might have to retroactively remove 6012/// a shadow decl, which requires several O(n) operations because the 6013/// decl structures are (very reasonably) not designed for removal. 6014/// (2) avoids this but is very fiddly and phase-dependent. 6015void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 6016 if (Shadow->getDeclName().getNameKind() == 6017 DeclarationName::CXXConversionFunctionName) 6018 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 6019 6020 // Remove it from the DeclContext... 6021 Shadow->getDeclContext()->removeDecl(Shadow); 6022 6023 // ...and the scope, if applicable... 6024 if (S) { 6025 S->RemoveDecl(Shadow); 6026 IdResolver.RemoveDecl(Shadow); 6027 } 6028 6029 // ...and the using decl. 6030 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 6031 6032 // TODO: complain somehow if Shadow was used. It shouldn't 6033 // be possible for this to happen, because...? 6034} 6035 6036/// Builds a using declaration. 6037/// 6038/// \param IsInstantiation - Whether this call arises from an 6039/// instantiation of an unresolved using declaration. We treat 6040/// the lookup differently for these declarations. 6041NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 6042 SourceLocation UsingLoc, 6043 CXXScopeSpec &SS, 6044 const DeclarationNameInfo &NameInfo, 6045 AttributeList *AttrList, 6046 bool IsInstantiation, 6047 bool IsTypeName, 6048 SourceLocation TypenameLoc) { 6049 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 6050 SourceLocation IdentLoc = NameInfo.getLoc(); 6051 assert(IdentLoc.isValid() && "Invalid TargetName location."); 6052 6053 // FIXME: We ignore attributes for now. 6054 6055 if (SS.isEmpty()) { 6056 Diag(IdentLoc, diag::err_using_requires_qualname); 6057 return 0; 6058 } 6059 6060 // Do the redeclaration lookup in the current scope. 6061 LookupResult Previous(*this, NameInfo, LookupUsingDeclName, 6062 ForRedeclaration); 6063 Previous.setHideTags(false); 6064 if (S) { 6065 LookupName(Previous, S); 6066 6067 // It is really dumb that we have to do this. 6068 LookupResult::Filter F = Previous.makeFilter(); 6069 while (F.hasNext()) { 6070 NamedDecl *D = F.next(); 6071 if (!isDeclInScope(D, CurContext, S)) 6072 F.erase(); 6073 } 6074 F.done(); 6075 } else { 6076 assert(IsInstantiation && "no scope in non-instantiation"); 6077 assert(CurContext->isRecord() && "scope not record in instantiation"); 6078 LookupQualifiedName(Previous, CurContext); 6079 } 6080 6081 // Check for invalid redeclarations. 6082 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 6083 return 0; 6084 6085 // Check for bad qualifiers. 6086 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 6087 return 0; 6088 6089 DeclContext *LookupContext = computeDeclContext(SS); 6090 NamedDecl *D; 6091 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 6092 if (!LookupContext) { 6093 if (IsTypeName) { 6094 // FIXME: not all declaration name kinds are legal here 6095 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 6096 UsingLoc, TypenameLoc, 6097 QualifierLoc, 6098 IdentLoc, NameInfo.getName()); 6099 } else { 6100 D = UnresolvedUsingValueDecl::Create(Context, CurContext, UsingLoc, 6101 QualifierLoc, NameInfo); 6102 } 6103 } else { 6104 D = UsingDecl::Create(Context, CurContext, UsingLoc, QualifierLoc, 6105 NameInfo, IsTypeName); 6106 } 6107 D->setAccess(AS); 6108 CurContext->addDecl(D); 6109 6110 if (!LookupContext) return D; 6111 UsingDecl *UD = cast<UsingDecl>(D); 6112 6113 if (RequireCompleteDeclContext(SS, LookupContext)) { 6114 UD->setInvalidDecl(); 6115 return UD; 6116 } 6117 6118 // The normal rules do not apply to inheriting constructor declarations. 6119 if (NameInfo.getName().getNameKind() == DeclarationName::CXXConstructorName) { 6120 if (CheckInheritingConstructorUsingDecl(UD)) 6121 UD->setInvalidDecl(); 6122 return UD; 6123 } 6124 6125 // Otherwise, look up the target name. 6126 6127 LookupResult R(*this, NameInfo, LookupOrdinaryName); 6128 6129 // Unlike most lookups, we don't always want to hide tag 6130 // declarations: tag names are visible through the using declaration 6131 // even if hidden by ordinary names, *except* in a dependent context 6132 // where it's important for the sanity of two-phase lookup. 6133 if (!IsInstantiation) 6134 R.setHideTags(false); 6135 6136 // For the purposes of this lookup, we have a base object type 6137 // equal to that of the current context. 6138 if (CurContext->isRecord()) { 6139 R.setBaseObjectType( 6140 Context.getTypeDeclType(cast<CXXRecordDecl>(CurContext))); 6141 } 6142 6143 LookupQualifiedName(R, LookupContext); 6144 6145 if (R.empty()) { 6146 Diag(IdentLoc, diag::err_no_member) 6147 << NameInfo.getName() << LookupContext << SS.getRange(); 6148 UD->setInvalidDecl(); 6149 return UD; 6150 } 6151 6152 if (R.isAmbiguous()) { 6153 UD->setInvalidDecl(); 6154 return UD; 6155 } 6156 6157 if (IsTypeName) { 6158 // If we asked for a typename and got a non-type decl, error out. 6159 if (!R.getAsSingle<TypeDecl>()) { 6160 Diag(IdentLoc, diag::err_using_typename_non_type); 6161 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 6162 Diag((*I)->getUnderlyingDecl()->getLocation(), 6163 diag::note_using_decl_target); 6164 UD->setInvalidDecl(); 6165 return UD; 6166 } 6167 } else { 6168 // If we asked for a non-typename and we got a type, error out, 6169 // but only if this is an instantiation of an unresolved using 6170 // decl. Otherwise just silently find the type name. 6171 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 6172 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 6173 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 6174 UD->setInvalidDecl(); 6175 return UD; 6176 } 6177 } 6178 6179 // C++0x N2914 [namespace.udecl]p6: 6180 // A using-declaration shall not name a namespace. 6181 if (R.getAsSingle<NamespaceDecl>()) { 6182 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 6183 << SS.getRange(); 6184 UD->setInvalidDecl(); 6185 return UD; 6186 } 6187 6188 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 6189 if (!CheckUsingShadowDecl(UD, *I, Previous)) 6190 BuildUsingShadowDecl(S, UD, *I); 6191 } 6192 6193 return UD; 6194} 6195 6196/// Additional checks for a using declaration referring to a constructor name. 6197bool Sema::CheckInheritingConstructorUsingDecl(UsingDecl *UD) { 6198 assert(!UD->isTypeName() && "expecting a constructor name"); 6199 6200 const Type *SourceType = UD->getQualifier()->getAsType(); 6201 assert(SourceType && 6202 "Using decl naming constructor doesn't have type in scope spec."); 6203 CXXRecordDecl *TargetClass = cast<CXXRecordDecl>(CurContext); 6204 6205 // Check whether the named type is a direct base class. 6206 CanQualType CanonicalSourceType = SourceType->getCanonicalTypeUnqualified(); 6207 CXXRecordDecl::base_class_iterator BaseIt, BaseE; 6208 for (BaseIt = TargetClass->bases_begin(), BaseE = TargetClass->bases_end(); 6209 BaseIt != BaseE; ++BaseIt) { 6210 CanQualType BaseType = BaseIt->getType()->getCanonicalTypeUnqualified(); 6211 if (CanonicalSourceType == BaseType) 6212 break; 6213 if (BaseIt->getType()->isDependentType()) 6214 break; 6215 } 6216 6217 if (BaseIt == BaseE) { 6218 // Did not find SourceType in the bases. 6219 Diag(UD->getUsingLocation(), 6220 diag::err_using_decl_constructor_not_in_direct_base) 6221 << UD->getNameInfo().getSourceRange() 6222 << QualType(SourceType, 0) << TargetClass; 6223 return true; 6224 } 6225 6226 if (!CurContext->isDependentContext()) 6227 BaseIt->setInheritConstructors(); 6228 6229 return false; 6230} 6231 6232/// Checks that the given using declaration is not an invalid 6233/// redeclaration. Note that this is checking only for the using decl 6234/// itself, not for any ill-formedness among the UsingShadowDecls. 6235bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 6236 bool isTypeName, 6237 const CXXScopeSpec &SS, 6238 SourceLocation NameLoc, 6239 const LookupResult &Prev) { 6240 // C++03 [namespace.udecl]p8: 6241 // C++0x [namespace.udecl]p10: 6242 // A using-declaration is a declaration and can therefore be used 6243 // repeatedly where (and only where) multiple declarations are 6244 // allowed. 6245 // 6246 // That's in non-member contexts. 6247 if (!CurContext->getRedeclContext()->isRecord()) 6248 return false; 6249 6250 NestedNameSpecifier *Qual 6251 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 6252 6253 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 6254 NamedDecl *D = *I; 6255 6256 bool DTypename; 6257 NestedNameSpecifier *DQual; 6258 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 6259 DTypename = UD->isTypeName(); 6260 DQual = UD->getQualifier(); 6261 } else if (UnresolvedUsingValueDecl *UD 6262 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 6263 DTypename = false; 6264 DQual = UD->getQualifier(); 6265 } else if (UnresolvedUsingTypenameDecl *UD 6266 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 6267 DTypename = true; 6268 DQual = UD->getQualifier(); 6269 } else continue; 6270 6271 // using decls differ if one says 'typename' and the other doesn't. 6272 // FIXME: non-dependent using decls? 6273 if (isTypeName != DTypename) continue; 6274 6275 // using decls differ if they name different scopes (but note that 6276 // template instantiation can cause this check to trigger when it 6277 // didn't before instantiation). 6278 if (Context.getCanonicalNestedNameSpecifier(Qual) != 6279 Context.getCanonicalNestedNameSpecifier(DQual)) 6280 continue; 6281 6282 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 6283 Diag(D->getLocation(), diag::note_using_decl) << 1; 6284 return true; 6285 } 6286 6287 return false; 6288} 6289 6290 6291/// Checks that the given nested-name qualifier used in a using decl 6292/// in the current context is appropriately related to the current 6293/// scope. If an error is found, diagnoses it and returns true. 6294bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 6295 const CXXScopeSpec &SS, 6296 SourceLocation NameLoc) { 6297 DeclContext *NamedContext = computeDeclContext(SS); 6298 6299 if (!CurContext->isRecord()) { 6300 // C++03 [namespace.udecl]p3: 6301 // C++0x [namespace.udecl]p8: 6302 // A using-declaration for a class member shall be a member-declaration. 6303 6304 // If we weren't able to compute a valid scope, it must be a 6305 // dependent class scope. 6306 if (!NamedContext || NamedContext->isRecord()) { 6307 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 6308 << SS.getRange(); 6309 return true; 6310 } 6311 6312 // Otherwise, everything is known to be fine. 6313 return false; 6314 } 6315 6316 // The current scope is a record. 6317 6318 // If the named context is dependent, we can't decide much. 6319 if (!NamedContext) { 6320 // FIXME: in C++0x, we can diagnose if we can prove that the 6321 // nested-name-specifier does not refer to a base class, which is 6322 // still possible in some cases. 6323 6324 // Otherwise we have to conservatively report that things might be 6325 // okay. 6326 return false; 6327 } 6328 6329 if (!NamedContext->isRecord()) { 6330 // Ideally this would point at the last name in the specifier, 6331 // but we don't have that level of source info. 6332 Diag(SS.getRange().getBegin(), 6333 diag::err_using_decl_nested_name_specifier_is_not_class) 6334 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 6335 return true; 6336 } 6337 6338 if (!NamedContext->isDependentContext() && 6339 RequireCompleteDeclContext(const_cast<CXXScopeSpec&>(SS), NamedContext)) 6340 return true; 6341 6342 if (getLangOpts().CPlusPlus0x) { 6343 // C++0x [namespace.udecl]p3: 6344 // In a using-declaration used as a member-declaration, the 6345 // nested-name-specifier shall name a base class of the class 6346 // being defined. 6347 6348 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 6349 cast<CXXRecordDecl>(NamedContext))) { 6350 if (CurContext == NamedContext) { 6351 Diag(NameLoc, 6352 diag::err_using_decl_nested_name_specifier_is_current_class) 6353 << SS.getRange(); 6354 return true; 6355 } 6356 6357 Diag(SS.getRange().getBegin(), 6358 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6359 << (NestedNameSpecifier*) SS.getScopeRep() 6360 << cast<CXXRecordDecl>(CurContext) 6361 << SS.getRange(); 6362 return true; 6363 } 6364 6365 return false; 6366 } 6367 6368 // C++03 [namespace.udecl]p4: 6369 // A using-declaration used as a member-declaration shall refer 6370 // to a member of a base class of the class being defined [etc.]. 6371 6372 // Salient point: SS doesn't have to name a base class as long as 6373 // lookup only finds members from base classes. Therefore we can 6374 // diagnose here only if we can prove that that can't happen, 6375 // i.e. if the class hierarchies provably don't intersect. 6376 6377 // TODO: it would be nice if "definitely valid" results were cached 6378 // in the UsingDecl and UsingShadowDecl so that these checks didn't 6379 // need to be repeated. 6380 6381 struct UserData { 6382 llvm::SmallPtrSet<const CXXRecordDecl*, 4> Bases; 6383 6384 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 6385 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 6386 Data->Bases.insert(Base); 6387 return true; 6388 } 6389 6390 bool hasDependentBases(const CXXRecordDecl *Class) { 6391 return !Class->forallBases(collect, this); 6392 } 6393 6394 /// Returns true if the base is dependent or is one of the 6395 /// accumulated base classes. 6396 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 6397 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 6398 return !Data->Bases.count(Base); 6399 } 6400 6401 bool mightShareBases(const CXXRecordDecl *Class) { 6402 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 6403 } 6404 }; 6405 6406 UserData Data; 6407 6408 // Returns false if we find a dependent base. 6409 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 6410 return false; 6411 6412 // Returns false if the class has a dependent base or if it or one 6413 // of its bases is present in the base set of the current context. 6414 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 6415 return false; 6416 6417 Diag(SS.getRange().getBegin(), 6418 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6419 << (NestedNameSpecifier*) SS.getScopeRep() 6420 << cast<CXXRecordDecl>(CurContext) 6421 << SS.getRange(); 6422 6423 return true; 6424} 6425 6426Decl *Sema::ActOnAliasDeclaration(Scope *S, 6427 AccessSpecifier AS, 6428 MultiTemplateParamsArg TemplateParamLists, 6429 SourceLocation UsingLoc, 6430 UnqualifiedId &Name, 6431 TypeResult Type) { 6432 // Skip up to the relevant declaration scope. 6433 while (S->getFlags() & Scope::TemplateParamScope) 6434 S = S->getParent(); 6435 assert((S->getFlags() & Scope::DeclScope) && 6436 "got alias-declaration outside of declaration scope"); 6437 6438 if (Type.isInvalid()) 6439 return 0; 6440 6441 bool Invalid = false; 6442 DeclarationNameInfo NameInfo = GetNameFromUnqualifiedId(Name); 6443 TypeSourceInfo *TInfo = 0; 6444 GetTypeFromParser(Type.get(), &TInfo); 6445 6446 if (DiagnoseClassNameShadow(CurContext, NameInfo)) 6447 return 0; 6448 6449 if (DiagnoseUnexpandedParameterPack(Name.StartLocation, TInfo, 6450 UPPC_DeclarationType)) { 6451 Invalid = true; 6452 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 6453 TInfo->getTypeLoc().getBeginLoc()); 6454 } 6455 6456 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, ForRedeclaration); 6457 LookupName(Previous, S); 6458 6459 // Warn about shadowing the name of a template parameter. 6460 if (Previous.isSingleResult() && 6461 Previous.getFoundDecl()->isTemplateParameter()) { 6462 DiagnoseTemplateParameterShadow(Name.StartLocation,Previous.getFoundDecl()); 6463 Previous.clear(); 6464 } 6465 6466 assert(Name.Kind == UnqualifiedId::IK_Identifier && 6467 "name in alias declaration must be an identifier"); 6468 TypeAliasDecl *NewTD = TypeAliasDecl::Create(Context, CurContext, UsingLoc, 6469 Name.StartLocation, 6470 Name.Identifier, TInfo); 6471 6472 NewTD->setAccess(AS); 6473 6474 if (Invalid) 6475 NewTD->setInvalidDecl(); 6476 6477 CheckTypedefForVariablyModifiedType(S, NewTD); 6478 Invalid |= NewTD->isInvalidDecl(); 6479 6480 bool Redeclaration = false; 6481 6482 NamedDecl *NewND; 6483 if (TemplateParamLists.size()) { 6484 TypeAliasTemplateDecl *OldDecl = 0; 6485 TemplateParameterList *OldTemplateParams = 0; 6486 6487 if (TemplateParamLists.size() != 1) { 6488 Diag(UsingLoc, diag::err_alias_template_extra_headers) 6489 << SourceRange(TemplateParamLists.get()[1]->getTemplateLoc(), 6490 TemplateParamLists.get()[TemplateParamLists.size()-1]->getRAngleLoc()); 6491 } 6492 TemplateParameterList *TemplateParams = TemplateParamLists.get()[0]; 6493 6494 // Only consider previous declarations in the same scope. 6495 FilterLookupForScope(Previous, CurContext, S, /*ConsiderLinkage*/false, 6496 /*ExplicitInstantiationOrSpecialization*/false); 6497 if (!Previous.empty()) { 6498 Redeclaration = true; 6499 6500 OldDecl = Previous.getAsSingle<TypeAliasTemplateDecl>(); 6501 if (!OldDecl && !Invalid) { 6502 Diag(UsingLoc, diag::err_redefinition_different_kind) 6503 << Name.Identifier; 6504 6505 NamedDecl *OldD = Previous.getRepresentativeDecl(); 6506 if (OldD->getLocation().isValid()) 6507 Diag(OldD->getLocation(), diag::note_previous_definition); 6508 6509 Invalid = true; 6510 } 6511 6512 if (!Invalid && OldDecl && !OldDecl->isInvalidDecl()) { 6513 if (TemplateParameterListsAreEqual(TemplateParams, 6514 OldDecl->getTemplateParameters(), 6515 /*Complain=*/true, 6516 TPL_TemplateMatch)) 6517 OldTemplateParams = OldDecl->getTemplateParameters(); 6518 else 6519 Invalid = true; 6520 6521 TypeAliasDecl *OldTD = OldDecl->getTemplatedDecl(); 6522 if (!Invalid && 6523 !Context.hasSameType(OldTD->getUnderlyingType(), 6524 NewTD->getUnderlyingType())) { 6525 // FIXME: The C++0x standard does not clearly say this is ill-formed, 6526 // but we can't reasonably accept it. 6527 Diag(NewTD->getLocation(), diag::err_redefinition_different_typedef) 6528 << 2 << NewTD->getUnderlyingType() << OldTD->getUnderlyingType(); 6529 if (OldTD->getLocation().isValid()) 6530 Diag(OldTD->getLocation(), diag::note_previous_definition); 6531 Invalid = true; 6532 } 6533 } 6534 } 6535 6536 // Merge any previous default template arguments into our parameters, 6537 // and check the parameter list. 6538 if (CheckTemplateParameterList(TemplateParams, OldTemplateParams, 6539 TPC_TypeAliasTemplate)) 6540 return 0; 6541 6542 TypeAliasTemplateDecl *NewDecl = 6543 TypeAliasTemplateDecl::Create(Context, CurContext, UsingLoc, 6544 Name.Identifier, TemplateParams, 6545 NewTD); 6546 6547 NewDecl->setAccess(AS); 6548 6549 if (Invalid) 6550 NewDecl->setInvalidDecl(); 6551 else if (OldDecl) 6552 NewDecl->setPreviousDeclaration(OldDecl); 6553 6554 NewND = NewDecl; 6555 } else { 6556 ActOnTypedefNameDecl(S, CurContext, NewTD, Previous, Redeclaration); 6557 NewND = NewTD; 6558 } 6559 6560 if (!Redeclaration) 6561 PushOnScopeChains(NewND, S); 6562 6563 return NewND; 6564} 6565 6566Decl *Sema::ActOnNamespaceAliasDef(Scope *S, 6567 SourceLocation NamespaceLoc, 6568 SourceLocation AliasLoc, 6569 IdentifierInfo *Alias, 6570 CXXScopeSpec &SS, 6571 SourceLocation IdentLoc, 6572 IdentifierInfo *Ident) { 6573 6574 // Lookup the namespace name. 6575 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 6576 LookupParsedName(R, S, &SS); 6577 6578 // Check if we have a previous declaration with the same name. 6579 NamedDecl *PrevDecl 6580 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 6581 ForRedeclaration); 6582 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 6583 PrevDecl = 0; 6584 6585 if (PrevDecl) { 6586 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 6587 // We already have an alias with the same name that points to the same 6588 // namespace, so don't create a new one. 6589 // FIXME: At some point, we'll want to create the (redundant) 6590 // declaration to maintain better source information. 6591 if (!R.isAmbiguous() && !R.empty() && 6592 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 6593 return 0; 6594 } 6595 6596 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 6597 diag::err_redefinition_different_kind; 6598 Diag(AliasLoc, DiagID) << Alias; 6599 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 6600 return 0; 6601 } 6602 6603 if (R.isAmbiguous()) 6604 return 0; 6605 6606 if (R.empty()) { 6607 if (!TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, Ident)) { 6608 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 6609 return 0; 6610 } 6611 } 6612 6613 NamespaceAliasDecl *AliasDecl = 6614 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 6615 Alias, SS.getWithLocInContext(Context), 6616 IdentLoc, R.getFoundDecl()); 6617 6618 PushOnScopeChains(AliasDecl, S); 6619 return AliasDecl; 6620} 6621 6622namespace { 6623 /// \brief Scoped object used to handle the state changes required in Sema 6624 /// to implicitly define the body of a C++ member function; 6625 class ImplicitlyDefinedFunctionScope { 6626 Sema &S; 6627 Sema::ContextRAII SavedContext; 6628 6629 public: 6630 ImplicitlyDefinedFunctionScope(Sema &S, CXXMethodDecl *Method) 6631 : S(S), SavedContext(S, Method) 6632 { 6633 S.PushFunctionScope(); 6634 S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated); 6635 } 6636 6637 ~ImplicitlyDefinedFunctionScope() { 6638 S.PopExpressionEvaluationContext(); 6639 S.PopFunctionScopeInfo(); 6640 } 6641 }; 6642} 6643 6644Sema::ImplicitExceptionSpecification 6645Sema::ComputeDefaultedDefaultCtorExceptionSpec(CXXRecordDecl *ClassDecl) { 6646 // C++ [except.spec]p14: 6647 // An implicitly declared special member function (Clause 12) shall have an 6648 // exception-specification. [...] 6649 ImplicitExceptionSpecification ExceptSpec(*this); 6650 if (ClassDecl->isInvalidDecl()) 6651 return ExceptSpec; 6652 6653 // Direct base-class constructors. 6654 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 6655 BEnd = ClassDecl->bases_end(); 6656 B != BEnd; ++B) { 6657 if (B->isVirtual()) // Handled below. 6658 continue; 6659 6660 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 6661 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 6662 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 6663 // If this is a deleted function, add it anyway. This might be conformant 6664 // with the standard. This might not. I'm not sure. It might not matter. 6665 if (Constructor) 6666 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 6667 } 6668 } 6669 6670 // Virtual base-class constructors. 6671 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 6672 BEnd = ClassDecl->vbases_end(); 6673 B != BEnd; ++B) { 6674 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 6675 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 6676 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 6677 // If this is a deleted function, add it anyway. This might be conformant 6678 // with the standard. This might not. I'm not sure. It might not matter. 6679 if (Constructor) 6680 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 6681 } 6682 } 6683 6684 // Field constructors. 6685 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 6686 FEnd = ClassDecl->field_end(); 6687 F != FEnd; ++F) { 6688 if (F->hasInClassInitializer()) { 6689 if (Expr *E = F->getInClassInitializer()) 6690 ExceptSpec.CalledExpr(E); 6691 else if (!F->isInvalidDecl()) 6692 ExceptSpec.SetDelayed(); 6693 } else if (const RecordType *RecordTy 6694 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 6695 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 6696 CXXConstructorDecl *Constructor = LookupDefaultConstructor(FieldRecDecl); 6697 // If this is a deleted function, add it anyway. This might be conformant 6698 // with the standard. This might not. I'm not sure. It might not matter. 6699 // In particular, the problem is that this function never gets called. It 6700 // might just be ill-formed because this function attempts to refer to 6701 // a deleted function here. 6702 if (Constructor) 6703 ExceptSpec.CalledDecl(F->getLocation(), Constructor); 6704 } 6705 } 6706 6707 return ExceptSpec; 6708} 6709 6710CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( 6711 CXXRecordDecl *ClassDecl) { 6712 // C++ [class.ctor]p5: 6713 // A default constructor for a class X is a constructor of class X 6714 // that can be called without an argument. If there is no 6715 // user-declared constructor for class X, a default constructor is 6716 // implicitly declared. An implicitly-declared default constructor 6717 // is an inline public member of its class. 6718 assert(!ClassDecl->hasUserDeclaredConstructor() && 6719 "Should not build implicit default constructor!"); 6720 6721 ImplicitExceptionSpecification Spec = 6722 ComputeDefaultedDefaultCtorExceptionSpec(ClassDecl); 6723 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 6724 6725 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, 6726 CXXDefaultConstructor, 6727 false); 6728 6729 // Create the actual constructor declaration. 6730 CanQualType ClassType 6731 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 6732 SourceLocation ClassLoc = ClassDecl->getLocation(); 6733 DeclarationName Name 6734 = Context.DeclarationNames.getCXXConstructorName(ClassType); 6735 DeclarationNameInfo NameInfo(Name, ClassLoc); 6736 CXXConstructorDecl *DefaultCon = CXXConstructorDecl::Create( 6737 Context, ClassDecl, ClassLoc, NameInfo, 6738 Context.getFunctionType(Context.VoidTy, 0, 0, EPI), /*TInfo=*/0, 6739 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 6740 Constexpr); 6741 DefaultCon->setAccess(AS_public); 6742 DefaultCon->setDefaulted(); 6743 DefaultCon->setImplicit(); 6744 DefaultCon->setTrivial(ClassDecl->hasTrivialDefaultConstructor()); 6745 6746 // Note that we have declared this constructor. 6747 ++ASTContext::NumImplicitDefaultConstructorsDeclared; 6748 6749 if (Scope *S = getScopeForContext(ClassDecl)) 6750 PushOnScopeChains(DefaultCon, S, false); 6751 ClassDecl->addDecl(DefaultCon); 6752 6753 if (ShouldDeleteSpecialMember(DefaultCon, CXXDefaultConstructor)) 6754 DefaultCon->setDeletedAsWritten(); 6755 6756 return DefaultCon; 6757} 6758 6759void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 6760 CXXConstructorDecl *Constructor) { 6761 assert((Constructor->isDefaulted() && Constructor->isDefaultConstructor() && 6762 !Constructor->doesThisDeclarationHaveABody() && 6763 !Constructor->isDeleted()) && 6764 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 6765 6766 CXXRecordDecl *ClassDecl = Constructor->getParent(); 6767 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 6768 6769 ImplicitlyDefinedFunctionScope Scope(*this, Constructor); 6770 DiagnosticErrorTrap Trap(Diags); 6771 if (SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false) || 6772 Trap.hasErrorOccurred()) { 6773 Diag(CurrentLocation, diag::note_member_synthesized_at) 6774 << CXXDefaultConstructor << Context.getTagDeclType(ClassDecl); 6775 Constructor->setInvalidDecl(); 6776 return; 6777 } 6778 6779 SourceLocation Loc = Constructor->getLocation(); 6780 Constructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 6781 6782 Constructor->setUsed(); 6783 MarkVTableUsed(CurrentLocation, ClassDecl); 6784 6785 if (ASTMutationListener *L = getASTMutationListener()) { 6786 L->CompletedImplicitDefinition(Constructor); 6787 } 6788} 6789 6790/// Get any existing defaulted default constructor for the given class. Do not 6791/// implicitly define one if it does not exist. 6792static CXXConstructorDecl *getDefaultedDefaultConstructorUnsafe(Sema &Self, 6793 CXXRecordDecl *D) { 6794 ASTContext &Context = Self.Context; 6795 QualType ClassType = Context.getTypeDeclType(D); 6796 DeclarationName ConstructorName 6797 = Context.DeclarationNames.getCXXConstructorName( 6798 Context.getCanonicalType(ClassType.getUnqualifiedType())); 6799 6800 DeclContext::lookup_const_iterator Con, ConEnd; 6801 for (llvm::tie(Con, ConEnd) = D->lookup(ConstructorName); 6802 Con != ConEnd; ++Con) { 6803 // A function template cannot be defaulted. 6804 if (isa<FunctionTemplateDecl>(*Con)) 6805 continue; 6806 6807 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 6808 if (Constructor->isDefaultConstructor()) 6809 return Constructor->isDefaulted() ? Constructor : 0; 6810 } 6811 return 0; 6812} 6813 6814void Sema::ActOnFinishDelayedMemberInitializers(Decl *D) { 6815 if (!D) return; 6816 AdjustDeclIfTemplate(D); 6817 6818 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(D); 6819 CXXConstructorDecl *CtorDecl 6820 = getDefaultedDefaultConstructorUnsafe(*this, ClassDecl); 6821 6822 if (!CtorDecl) return; 6823 6824 // Compute the exception specification for the default constructor. 6825 const FunctionProtoType *CtorTy = 6826 CtorDecl->getType()->castAs<FunctionProtoType>(); 6827 if (CtorTy->getExceptionSpecType() == EST_Delayed) { 6828 // FIXME: Don't do this unless the exception spec is needed. 6829 ImplicitExceptionSpecification Spec = 6830 ComputeDefaultedDefaultCtorExceptionSpec(ClassDecl); 6831 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 6832 assert(EPI.ExceptionSpecType != EST_Delayed); 6833 6834 CtorDecl->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 6835 } 6836 6837 // If the default constructor is explicitly defaulted, checking the exception 6838 // specification is deferred until now. 6839 if (!CtorDecl->isInvalidDecl() && CtorDecl->isExplicitlyDefaulted() && 6840 !ClassDecl->isDependentType()) 6841 CheckExplicitlyDefaultedSpecialMember(CtorDecl); 6842} 6843 6844void Sema::DeclareInheritedConstructors(CXXRecordDecl *ClassDecl) { 6845 // We start with an initial pass over the base classes to collect those that 6846 // inherit constructors from. If there are none, we can forgo all further 6847 // processing. 6848 typedef SmallVector<const RecordType *, 4> BasesVector; 6849 BasesVector BasesToInheritFrom; 6850 for (CXXRecordDecl::base_class_iterator BaseIt = ClassDecl->bases_begin(), 6851 BaseE = ClassDecl->bases_end(); 6852 BaseIt != BaseE; ++BaseIt) { 6853 if (BaseIt->getInheritConstructors()) { 6854 QualType Base = BaseIt->getType(); 6855 if (Base->isDependentType()) { 6856 // If we inherit constructors from anything that is dependent, just 6857 // abort processing altogether. We'll get another chance for the 6858 // instantiations. 6859 return; 6860 } 6861 BasesToInheritFrom.push_back(Base->castAs<RecordType>()); 6862 } 6863 } 6864 if (BasesToInheritFrom.empty()) 6865 return; 6866 6867 // Now collect the constructors that we already have in the current class. 6868 // Those take precedence over inherited constructors. 6869 // C++0x [class.inhctor]p3: [...] a constructor is implicitly declared [...] 6870 // unless there is a user-declared constructor with the same signature in 6871 // the class where the using-declaration appears. 6872 llvm::SmallSet<const Type *, 8> ExistingConstructors; 6873 for (CXXRecordDecl::ctor_iterator CtorIt = ClassDecl->ctor_begin(), 6874 CtorE = ClassDecl->ctor_end(); 6875 CtorIt != CtorE; ++CtorIt) { 6876 ExistingConstructors.insert( 6877 Context.getCanonicalType(CtorIt->getType()).getTypePtr()); 6878 } 6879 6880 DeclarationName CreatedCtorName = 6881 Context.DeclarationNames.getCXXConstructorName( 6882 ClassDecl->getTypeForDecl()->getCanonicalTypeUnqualified()); 6883 6884 // Now comes the true work. 6885 // First, we keep a map from constructor types to the base that introduced 6886 // them. Needed for finding conflicting constructors. We also keep the 6887 // actually inserted declarations in there, for pretty diagnostics. 6888 typedef std::pair<CanQualType, CXXConstructorDecl *> ConstructorInfo; 6889 typedef llvm::DenseMap<const Type *, ConstructorInfo> ConstructorToSourceMap; 6890 ConstructorToSourceMap InheritedConstructors; 6891 for (BasesVector::iterator BaseIt = BasesToInheritFrom.begin(), 6892 BaseE = BasesToInheritFrom.end(); 6893 BaseIt != BaseE; ++BaseIt) { 6894 const RecordType *Base = *BaseIt; 6895 CanQualType CanonicalBase = Base->getCanonicalTypeUnqualified(); 6896 CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(Base->getDecl()); 6897 for (CXXRecordDecl::ctor_iterator CtorIt = BaseDecl->ctor_begin(), 6898 CtorE = BaseDecl->ctor_end(); 6899 CtorIt != CtorE; ++CtorIt) { 6900 // Find the using declaration for inheriting this base's constructors. 6901 // FIXME: Don't perform name lookup just to obtain a source location! 6902 DeclarationName Name = 6903 Context.DeclarationNames.getCXXConstructorName(CanonicalBase); 6904 LookupResult Result(*this, Name, SourceLocation(), LookupUsingDeclName); 6905 LookupQualifiedName(Result, CurContext); 6906 UsingDecl *UD = Result.getAsSingle<UsingDecl>(); 6907 SourceLocation UsingLoc = UD ? UD->getLocation() : 6908 ClassDecl->getLocation(); 6909 6910 // C++0x [class.inhctor]p1: The candidate set of inherited constructors 6911 // from the class X named in the using-declaration consists of actual 6912 // constructors and notional constructors that result from the 6913 // transformation of defaulted parameters as follows: 6914 // - all non-template default constructors of X, and 6915 // - for each non-template constructor of X that has at least one 6916 // parameter with a default argument, the set of constructors that 6917 // results from omitting any ellipsis parameter specification and 6918 // successively omitting parameters with a default argument from the 6919 // end of the parameter-type-list. 6920 CXXConstructorDecl *BaseCtor = *CtorIt; 6921 bool CanBeCopyOrMove = BaseCtor->isCopyOrMoveConstructor(); 6922 const FunctionProtoType *BaseCtorType = 6923 BaseCtor->getType()->getAs<FunctionProtoType>(); 6924 6925 for (unsigned params = BaseCtor->getMinRequiredArguments(), 6926 maxParams = BaseCtor->getNumParams(); 6927 params <= maxParams; ++params) { 6928 // Skip default constructors. They're never inherited. 6929 if (params == 0) 6930 continue; 6931 // Skip copy and move constructors for the same reason. 6932 if (CanBeCopyOrMove && params == 1) 6933 continue; 6934 6935 // Build up a function type for this particular constructor. 6936 // FIXME: The working paper does not consider that the exception spec 6937 // for the inheriting constructor might be larger than that of the 6938 // source. This code doesn't yet, either. When it does, this code will 6939 // need to be delayed until after exception specifications and in-class 6940 // member initializers are attached. 6941 const Type *NewCtorType; 6942 if (params == maxParams) 6943 NewCtorType = BaseCtorType; 6944 else { 6945 SmallVector<QualType, 16> Args; 6946 for (unsigned i = 0; i < params; ++i) { 6947 Args.push_back(BaseCtorType->getArgType(i)); 6948 } 6949 FunctionProtoType::ExtProtoInfo ExtInfo = 6950 BaseCtorType->getExtProtoInfo(); 6951 ExtInfo.Variadic = false; 6952 NewCtorType = Context.getFunctionType(BaseCtorType->getResultType(), 6953 Args.data(), params, ExtInfo) 6954 .getTypePtr(); 6955 } 6956 const Type *CanonicalNewCtorType = 6957 Context.getCanonicalType(NewCtorType); 6958 6959 // Now that we have the type, first check if the class already has a 6960 // constructor with this signature. 6961 if (ExistingConstructors.count(CanonicalNewCtorType)) 6962 continue; 6963 6964 // Then we check if we have already declared an inherited constructor 6965 // with this signature. 6966 std::pair<ConstructorToSourceMap::iterator, bool> result = 6967 InheritedConstructors.insert(std::make_pair( 6968 CanonicalNewCtorType, 6969 std::make_pair(CanonicalBase, (CXXConstructorDecl*)0))); 6970 if (!result.second) { 6971 // Already in the map. If it came from a different class, that's an 6972 // error. Not if it's from the same. 6973 CanQualType PreviousBase = result.first->second.first; 6974 if (CanonicalBase != PreviousBase) { 6975 const CXXConstructorDecl *PrevCtor = result.first->second.second; 6976 const CXXConstructorDecl *PrevBaseCtor = 6977 PrevCtor->getInheritedConstructor(); 6978 assert(PrevBaseCtor && "Conflicting constructor was not inherited"); 6979 6980 Diag(UsingLoc, diag::err_using_decl_constructor_conflict); 6981 Diag(BaseCtor->getLocation(), 6982 diag::note_using_decl_constructor_conflict_current_ctor); 6983 Diag(PrevBaseCtor->getLocation(), 6984 diag::note_using_decl_constructor_conflict_previous_ctor); 6985 Diag(PrevCtor->getLocation(), 6986 diag::note_using_decl_constructor_conflict_previous_using); 6987 } 6988 continue; 6989 } 6990 6991 // OK, we're there, now add the constructor. 6992 // C++0x [class.inhctor]p8: [...] that would be performed by a 6993 // user-written inline constructor [...] 6994 DeclarationNameInfo DNI(CreatedCtorName, UsingLoc); 6995 CXXConstructorDecl *NewCtor = CXXConstructorDecl::Create( 6996 Context, ClassDecl, UsingLoc, DNI, QualType(NewCtorType, 0), 6997 /*TInfo=*/0, BaseCtor->isExplicit(), /*Inline=*/true, 6998 /*ImplicitlyDeclared=*/true, 6999 // FIXME: Due to a defect in the standard, we treat inherited 7000 // constructors as constexpr even if that makes them ill-formed. 7001 /*Constexpr=*/BaseCtor->isConstexpr()); 7002 NewCtor->setAccess(BaseCtor->getAccess()); 7003 7004 // Build up the parameter decls and add them. 7005 SmallVector<ParmVarDecl *, 16> ParamDecls; 7006 for (unsigned i = 0; i < params; ++i) { 7007 ParamDecls.push_back(ParmVarDecl::Create(Context, NewCtor, 7008 UsingLoc, UsingLoc, 7009 /*IdentifierInfo=*/0, 7010 BaseCtorType->getArgType(i), 7011 /*TInfo=*/0, SC_None, 7012 SC_None, /*DefaultArg=*/0)); 7013 } 7014 NewCtor->setParams(ParamDecls); 7015 NewCtor->setInheritedConstructor(BaseCtor); 7016 7017 ClassDecl->addDecl(NewCtor); 7018 result.first->second.second = NewCtor; 7019 } 7020 } 7021 } 7022} 7023 7024Sema::ImplicitExceptionSpecification 7025Sema::ComputeDefaultedDtorExceptionSpec(CXXRecordDecl *ClassDecl) { 7026 // C++ [except.spec]p14: 7027 // An implicitly declared special member function (Clause 12) shall have 7028 // an exception-specification. 7029 ImplicitExceptionSpecification ExceptSpec(*this); 7030 if (ClassDecl->isInvalidDecl()) 7031 return ExceptSpec; 7032 7033 // Direct base-class destructors. 7034 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 7035 BEnd = ClassDecl->bases_end(); 7036 B != BEnd; ++B) { 7037 if (B->isVirtual()) // Handled below. 7038 continue; 7039 7040 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 7041 ExceptSpec.CalledDecl(B->getLocStart(), 7042 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 7043 } 7044 7045 // Virtual base-class destructors. 7046 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 7047 BEnd = ClassDecl->vbases_end(); 7048 B != BEnd; ++B) { 7049 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 7050 ExceptSpec.CalledDecl(B->getLocStart(), 7051 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 7052 } 7053 7054 // Field destructors. 7055 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 7056 FEnd = ClassDecl->field_end(); 7057 F != FEnd; ++F) { 7058 if (const RecordType *RecordTy 7059 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 7060 ExceptSpec.CalledDecl(F->getLocation(), 7061 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl()))); 7062 } 7063 7064 return ExceptSpec; 7065} 7066 7067CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { 7068 // C++ [class.dtor]p2: 7069 // If a class has no user-declared destructor, a destructor is 7070 // declared implicitly. An implicitly-declared destructor is an 7071 // inline public member of its class. 7072 7073 ImplicitExceptionSpecification Spec = 7074 ComputeDefaultedDtorExceptionSpec(ClassDecl); 7075 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 7076 7077 // Create the actual destructor declaration. 7078 QualType Ty = Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 7079 7080 CanQualType ClassType 7081 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 7082 SourceLocation ClassLoc = ClassDecl->getLocation(); 7083 DeclarationName Name 7084 = Context.DeclarationNames.getCXXDestructorName(ClassType); 7085 DeclarationNameInfo NameInfo(Name, ClassLoc); 7086 CXXDestructorDecl *Destructor 7087 = CXXDestructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, Ty, 0, 7088 /*isInline=*/true, 7089 /*isImplicitlyDeclared=*/true); 7090 Destructor->setAccess(AS_public); 7091 Destructor->setDefaulted(); 7092 Destructor->setImplicit(); 7093 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 7094 7095 // Note that we have declared this destructor. 7096 ++ASTContext::NumImplicitDestructorsDeclared; 7097 7098 // Introduce this destructor into its scope. 7099 if (Scope *S = getScopeForContext(ClassDecl)) 7100 PushOnScopeChains(Destructor, S, false); 7101 ClassDecl->addDecl(Destructor); 7102 7103 // This could be uniqued if it ever proves significant. 7104 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 7105 7106 AddOverriddenMethods(ClassDecl, Destructor); 7107 7108 if (ShouldDeleteSpecialMember(Destructor, CXXDestructor)) 7109 Destructor->setDeletedAsWritten(); 7110 7111 return Destructor; 7112} 7113 7114void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 7115 CXXDestructorDecl *Destructor) { 7116 assert((Destructor->isDefaulted() && 7117 !Destructor->doesThisDeclarationHaveABody() && 7118 !Destructor->isDeleted()) && 7119 "DefineImplicitDestructor - call it for implicit default dtor"); 7120 CXXRecordDecl *ClassDecl = Destructor->getParent(); 7121 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 7122 7123 if (Destructor->isInvalidDecl()) 7124 return; 7125 7126 ImplicitlyDefinedFunctionScope Scope(*this, Destructor); 7127 7128 DiagnosticErrorTrap Trap(Diags); 7129 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 7130 Destructor->getParent()); 7131 7132 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 7133 Diag(CurrentLocation, diag::note_member_synthesized_at) 7134 << CXXDestructor << Context.getTagDeclType(ClassDecl); 7135 7136 Destructor->setInvalidDecl(); 7137 return; 7138 } 7139 7140 SourceLocation Loc = Destructor->getLocation(); 7141 Destructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 7142 Destructor->setImplicitlyDefined(true); 7143 Destructor->setUsed(); 7144 MarkVTableUsed(CurrentLocation, ClassDecl); 7145 7146 if (ASTMutationListener *L = getASTMutationListener()) { 7147 L->CompletedImplicitDefinition(Destructor); 7148 } 7149} 7150 7151/// \brief Perform any semantic analysis which needs to be delayed until all 7152/// pending class member declarations have been parsed. 7153void Sema::ActOnFinishCXXMemberDecls() { 7154 // Now we have parsed all exception specifications, determine the implicit 7155 // exception specifications for destructors. 7156 for (unsigned i = 0, e = DelayedDestructorExceptionSpecs.size(); 7157 i != e; ++i) { 7158 CXXDestructorDecl *Dtor = DelayedDestructorExceptionSpecs[i]; 7159 AdjustDestructorExceptionSpec(Dtor->getParent(), Dtor, true); 7160 } 7161 DelayedDestructorExceptionSpecs.clear(); 7162 7163 // Perform any deferred checking of exception specifications for virtual 7164 // destructors. 7165 for (unsigned i = 0, e = DelayedDestructorExceptionSpecChecks.size(); 7166 i != e; ++i) { 7167 const CXXDestructorDecl *Dtor = 7168 DelayedDestructorExceptionSpecChecks[i].first; 7169 assert(!Dtor->getParent()->isDependentType() && 7170 "Should not ever add destructors of templates into the list."); 7171 CheckOverridingFunctionExceptionSpec(Dtor, 7172 DelayedDestructorExceptionSpecChecks[i].second); 7173 } 7174 DelayedDestructorExceptionSpecChecks.clear(); 7175} 7176 7177void Sema::AdjustDestructorExceptionSpec(CXXRecordDecl *classDecl, 7178 CXXDestructorDecl *destructor, 7179 bool WasDelayed) { 7180 // C++11 [class.dtor]p3: 7181 // A declaration of a destructor that does not have an exception- 7182 // specification is implicitly considered to have the same exception- 7183 // specification as an implicit declaration. 7184 const FunctionProtoType *dtorType = destructor->getType()-> 7185 getAs<FunctionProtoType>(); 7186 if (!WasDelayed && dtorType->hasExceptionSpec()) 7187 return; 7188 7189 ImplicitExceptionSpecification exceptSpec = 7190 ComputeDefaultedDtorExceptionSpec(classDecl); 7191 7192 // Replace the destructor's type, building off the existing one. Fortunately, 7193 // the only thing of interest in the destructor type is its extended info. 7194 // The return and arguments are fixed. 7195 FunctionProtoType::ExtProtoInfo epi = dtorType->getExtProtoInfo(); 7196 epi.ExceptionSpecType = exceptSpec.getExceptionSpecType(); 7197 epi.NumExceptions = exceptSpec.size(); 7198 epi.Exceptions = exceptSpec.data(); 7199 QualType ty = Context.getFunctionType(Context.VoidTy, 0, 0, epi); 7200 7201 destructor->setType(ty); 7202 7203 // If we can't compute the exception specification for this destructor yet 7204 // (because it depends on an exception specification which we have not parsed 7205 // yet), make a note that we need to try again when the class is complete. 7206 if (epi.ExceptionSpecType == EST_Delayed) { 7207 assert(!WasDelayed && "couldn't compute destructor exception spec"); 7208 DelayedDestructorExceptionSpecs.push_back(destructor); 7209 } 7210 7211 // FIXME: If the destructor has a body that could throw, and the newly created 7212 // spec doesn't allow exceptions, we should emit a warning, because this 7213 // change in behavior can break conforming C++03 programs at runtime. 7214 // However, we don't have a body yet, so it needs to be done somewhere else. 7215} 7216 7217/// \brief Builds a statement that copies/moves the given entity from \p From to 7218/// \c To. 7219/// 7220/// This routine is used to copy/move the members of a class with an 7221/// implicitly-declared copy/move assignment operator. When the entities being 7222/// copied are arrays, this routine builds for loops to copy them. 7223/// 7224/// \param S The Sema object used for type-checking. 7225/// 7226/// \param Loc The location where the implicit copy/move is being generated. 7227/// 7228/// \param T The type of the expressions being copied/moved. Both expressions 7229/// must have this type. 7230/// 7231/// \param To The expression we are copying/moving to. 7232/// 7233/// \param From The expression we are copying/moving from. 7234/// 7235/// \param CopyingBaseSubobject Whether we're copying/moving a base subobject. 7236/// Otherwise, it's a non-static member subobject. 7237/// 7238/// \param Copying Whether we're copying or moving. 7239/// 7240/// \param Depth Internal parameter recording the depth of the recursion. 7241/// 7242/// \returns A statement or a loop that copies the expressions. 7243static StmtResult 7244BuildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 7245 Expr *To, Expr *From, 7246 bool CopyingBaseSubobject, bool Copying, 7247 unsigned Depth = 0) { 7248 // C++0x [class.copy]p28: 7249 // Each subobject is assigned in the manner appropriate to its type: 7250 // 7251 // - if the subobject is of class type, as if by a call to operator= with 7252 // the subobject as the object expression and the corresponding 7253 // subobject of x as a single function argument (as if by explicit 7254 // qualification; that is, ignoring any possible virtual overriding 7255 // functions in more derived classes); 7256 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 7257 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 7258 7259 // Look for operator=. 7260 DeclarationName Name 7261 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 7262 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 7263 S.LookupQualifiedName(OpLookup, ClassDecl, false); 7264 7265 // Filter out any result that isn't a copy/move-assignment operator. 7266 LookupResult::Filter F = OpLookup.makeFilter(); 7267 while (F.hasNext()) { 7268 NamedDecl *D = F.next(); 7269 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 7270 if (Method->isCopyAssignmentOperator() || 7271 (!Copying && Method->isMoveAssignmentOperator())) 7272 continue; 7273 7274 F.erase(); 7275 } 7276 F.done(); 7277 7278 // Suppress the protected check (C++ [class.protected]) for each of the 7279 // assignment operators we found. This strange dance is required when 7280 // we're assigning via a base classes's copy-assignment operator. To 7281 // ensure that we're getting the right base class subobject (without 7282 // ambiguities), we need to cast "this" to that subobject type; to 7283 // ensure that we don't go through the virtual call mechanism, we need 7284 // to qualify the operator= name with the base class (see below). However, 7285 // this means that if the base class has a protected copy assignment 7286 // operator, the protected member access check will fail. So, we 7287 // rewrite "protected" access to "public" access in this case, since we 7288 // know by construction that we're calling from a derived class. 7289 if (CopyingBaseSubobject) { 7290 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 7291 L != LEnd; ++L) { 7292 if (L.getAccess() == AS_protected) 7293 L.setAccess(AS_public); 7294 } 7295 } 7296 7297 // Create the nested-name-specifier that will be used to qualify the 7298 // reference to operator=; this is required to suppress the virtual 7299 // call mechanism. 7300 CXXScopeSpec SS; 7301 const Type *CanonicalT = S.Context.getCanonicalType(T.getTypePtr()); 7302 SS.MakeTrivial(S.Context, 7303 NestedNameSpecifier::Create(S.Context, 0, false, 7304 CanonicalT), 7305 Loc); 7306 7307 // Create the reference to operator=. 7308 ExprResult OpEqualRef 7309 = S.BuildMemberReferenceExpr(To, T, Loc, /*isArrow=*/false, SS, 7310 /*TemplateKWLoc=*/SourceLocation(), 7311 /*FirstQualifierInScope=*/0, 7312 OpLookup, 7313 /*TemplateArgs=*/0, 7314 /*SuppressQualifierCheck=*/true); 7315 if (OpEqualRef.isInvalid()) 7316 return StmtError(); 7317 7318 // Build the call to the assignment operator. 7319 7320 ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 7321 OpEqualRef.takeAs<Expr>(), 7322 Loc, &From, 1, Loc); 7323 if (Call.isInvalid()) 7324 return StmtError(); 7325 7326 return S.Owned(Call.takeAs<Stmt>()); 7327 } 7328 7329 // - if the subobject is of scalar type, the built-in assignment 7330 // operator is used. 7331 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 7332 if (!ArrayTy) { 7333 ExprResult Assignment = S.CreateBuiltinBinOp(Loc, BO_Assign, To, From); 7334 if (Assignment.isInvalid()) 7335 return StmtError(); 7336 7337 return S.Owned(Assignment.takeAs<Stmt>()); 7338 } 7339 7340 // - if the subobject is an array, each element is assigned, in the 7341 // manner appropriate to the element type; 7342 7343 // Construct a loop over the array bounds, e.g., 7344 // 7345 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 7346 // 7347 // that will copy each of the array elements. 7348 QualType SizeType = S.Context.getSizeType(); 7349 7350 // Create the iteration variable. 7351 IdentifierInfo *IterationVarName = 0; 7352 { 7353 SmallString<8> Str; 7354 llvm::raw_svector_ostream OS(Str); 7355 OS << "__i" << Depth; 7356 IterationVarName = &S.Context.Idents.get(OS.str()); 7357 } 7358 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, Loc, 7359 IterationVarName, SizeType, 7360 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 7361 SC_None, SC_None); 7362 7363 // Initialize the iteration variable to zero. 7364 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 7365 IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc)); 7366 7367 // Create a reference to the iteration variable; we'll use this several 7368 // times throughout. 7369 Expr *IterationVarRef 7370 = S.BuildDeclRefExpr(IterationVar, SizeType, VK_LValue, Loc).take(); 7371 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 7372 Expr *IterationVarRefRVal = S.DefaultLvalueConversion(IterationVarRef).take(); 7373 assert(IterationVarRefRVal && "Conversion of invented variable cannot fail!"); 7374 7375 // Create the DeclStmt that holds the iteration variable. 7376 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 7377 7378 // Create the comparison against the array bound. 7379 llvm::APInt Upper 7380 = ArrayTy->getSize().zextOrTrunc(S.Context.getTypeSize(SizeType)); 7381 Expr *Comparison 7382 = new (S.Context) BinaryOperator(IterationVarRefRVal, 7383 IntegerLiteral::Create(S.Context, Upper, SizeType, Loc), 7384 BO_NE, S.Context.BoolTy, 7385 VK_RValue, OK_Ordinary, Loc); 7386 7387 // Create the pre-increment of the iteration variable. 7388 Expr *Increment 7389 = new (S.Context) UnaryOperator(IterationVarRef, UO_PreInc, SizeType, 7390 VK_LValue, OK_Ordinary, Loc); 7391 7392 // Subscript the "from" and "to" expressions with the iteration variable. 7393 From = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(From, Loc, 7394 IterationVarRefRVal, 7395 Loc)); 7396 To = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(To, Loc, 7397 IterationVarRefRVal, 7398 Loc)); 7399 if (!Copying) // Cast to rvalue 7400 From = CastForMoving(S, From); 7401 7402 // Build the copy/move for an individual element of the array. 7403 StmtResult Copy = BuildSingleCopyAssign(S, Loc, ArrayTy->getElementType(), 7404 To, From, CopyingBaseSubobject, 7405 Copying, Depth + 1); 7406 if (Copy.isInvalid()) 7407 return StmtError(); 7408 7409 // Construct the loop that copies all elements of this array. 7410 return S.ActOnForStmt(Loc, Loc, InitStmt, 7411 S.MakeFullExpr(Comparison), 7412 0, S.MakeFullExpr(Increment), 7413 Loc, Copy.take()); 7414} 7415 7416std::pair<Sema::ImplicitExceptionSpecification, bool> 7417Sema::ComputeDefaultedCopyAssignmentExceptionSpecAndConst( 7418 CXXRecordDecl *ClassDecl) { 7419 if (ClassDecl->isInvalidDecl()) 7420 return std::make_pair(ImplicitExceptionSpecification(*this), true); 7421 7422 // C++ [class.copy]p10: 7423 // If the class definition does not explicitly declare a copy 7424 // assignment operator, one is declared implicitly. 7425 // The implicitly-defined copy assignment operator for a class X 7426 // will have the form 7427 // 7428 // X& X::operator=(const X&) 7429 // 7430 // if 7431 bool HasConstCopyAssignment = true; 7432 7433 // -- each direct base class B of X has a copy assignment operator 7434 // whose parameter is of type const B&, const volatile B& or B, 7435 // and 7436 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7437 BaseEnd = ClassDecl->bases_end(); 7438 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 7439 // We'll handle this below 7440 if (LangOpts.CPlusPlus0x && Base->isVirtual()) 7441 continue; 7442 7443 assert(!Base->getType()->isDependentType() && 7444 "Cannot generate implicit members for class with dependent bases."); 7445 CXXRecordDecl *BaseClassDecl = Base->getType()->getAsCXXRecordDecl(); 7446 HasConstCopyAssignment &= 7447 (bool)LookupCopyingAssignment(BaseClassDecl, Qualifiers::Const, 7448 false, 0); 7449 } 7450 7451 // In C++11, the above citation has "or virtual" added 7452 if (LangOpts.CPlusPlus0x) { 7453 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7454 BaseEnd = ClassDecl->vbases_end(); 7455 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 7456 assert(!Base->getType()->isDependentType() && 7457 "Cannot generate implicit members for class with dependent bases."); 7458 CXXRecordDecl *BaseClassDecl = Base->getType()->getAsCXXRecordDecl(); 7459 HasConstCopyAssignment &= 7460 (bool)LookupCopyingAssignment(BaseClassDecl, Qualifiers::Const, 7461 false, 0); 7462 } 7463 } 7464 7465 // -- for all the nonstatic data members of X that are of a class 7466 // type M (or array thereof), each such class type has a copy 7467 // assignment operator whose parameter is of type const M&, 7468 // const volatile M& or M. 7469 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7470 FieldEnd = ClassDecl->field_end(); 7471 HasConstCopyAssignment && Field != FieldEnd; 7472 ++Field) { 7473 QualType FieldType = Context.getBaseElementType(Field->getType()); 7474 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7475 HasConstCopyAssignment &= 7476 (bool)LookupCopyingAssignment(FieldClassDecl, Qualifiers::Const, 7477 false, 0); 7478 } 7479 } 7480 7481 // Otherwise, the implicitly declared copy assignment operator will 7482 // have the form 7483 // 7484 // X& X::operator=(X&) 7485 7486 // C++ [except.spec]p14: 7487 // An implicitly declared special member function (Clause 12) shall have an 7488 // exception-specification. [...] 7489 7490 // It is unspecified whether or not an implicit copy assignment operator 7491 // attempts to deduplicate calls to assignment operators of virtual bases are 7492 // made. As such, this exception specification is effectively unspecified. 7493 // Based on a similar decision made for constness in C++0x, we're erring on 7494 // the side of assuming such calls to be made regardless of whether they 7495 // actually happen. 7496 ImplicitExceptionSpecification ExceptSpec(*this); 7497 unsigned ArgQuals = HasConstCopyAssignment ? Qualifiers::Const : 0; 7498 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7499 BaseEnd = ClassDecl->bases_end(); 7500 Base != BaseEnd; ++Base) { 7501 if (Base->isVirtual()) 7502 continue; 7503 7504 CXXRecordDecl *BaseClassDecl 7505 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7506 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 7507 ArgQuals, false, 0)) 7508 ExceptSpec.CalledDecl(Base->getLocStart(), CopyAssign); 7509 } 7510 7511 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7512 BaseEnd = ClassDecl->vbases_end(); 7513 Base != BaseEnd; ++Base) { 7514 CXXRecordDecl *BaseClassDecl 7515 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7516 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 7517 ArgQuals, false, 0)) 7518 ExceptSpec.CalledDecl(Base->getLocStart(), CopyAssign); 7519 } 7520 7521 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7522 FieldEnd = ClassDecl->field_end(); 7523 Field != FieldEnd; 7524 ++Field) { 7525 QualType FieldType = Context.getBaseElementType(Field->getType()); 7526 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7527 if (CXXMethodDecl *CopyAssign = 7528 LookupCopyingAssignment(FieldClassDecl, ArgQuals, false, 0)) 7529 ExceptSpec.CalledDecl(Field->getLocation(), CopyAssign); 7530 } 7531 } 7532 7533 return std::make_pair(ExceptSpec, HasConstCopyAssignment); 7534} 7535 7536CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 7537 // Note: The following rules are largely analoguous to the copy 7538 // constructor rules. Note that virtual bases are not taken into account 7539 // for determining the argument type of the operator. Note also that 7540 // operators taking an object instead of a reference are allowed. 7541 7542 ImplicitExceptionSpecification Spec(*this); 7543 bool Const; 7544 llvm::tie(Spec, Const) = 7545 ComputeDefaultedCopyAssignmentExceptionSpecAndConst(ClassDecl); 7546 7547 QualType ArgType = Context.getTypeDeclType(ClassDecl); 7548 QualType RetType = Context.getLValueReferenceType(ArgType); 7549 if (Const) 7550 ArgType = ArgType.withConst(); 7551 ArgType = Context.getLValueReferenceType(ArgType); 7552 7553 // An implicitly-declared copy assignment operator is an inline public 7554 // member of its class. 7555 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 7556 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 7557 SourceLocation ClassLoc = ClassDecl->getLocation(); 7558 DeclarationNameInfo NameInfo(Name, ClassLoc); 7559 CXXMethodDecl *CopyAssignment 7560 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 7561 Context.getFunctionType(RetType, &ArgType, 1, EPI), 7562 /*TInfo=*/0, /*isStatic=*/false, 7563 /*StorageClassAsWritten=*/SC_None, 7564 /*isInline=*/true, /*isConstexpr=*/false, 7565 SourceLocation()); 7566 CopyAssignment->setAccess(AS_public); 7567 CopyAssignment->setDefaulted(); 7568 CopyAssignment->setImplicit(); 7569 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 7570 7571 // Add the parameter to the operator. 7572 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 7573 ClassLoc, ClassLoc, /*Id=*/0, 7574 ArgType, /*TInfo=*/0, 7575 SC_None, 7576 SC_None, 0); 7577 CopyAssignment->setParams(FromParam); 7578 7579 // Note that we have added this copy-assignment operator. 7580 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 7581 7582 if (Scope *S = getScopeForContext(ClassDecl)) 7583 PushOnScopeChains(CopyAssignment, S, false); 7584 ClassDecl->addDecl(CopyAssignment); 7585 7586 // C++0x [class.copy]p19: 7587 // .... If the class definition does not explicitly declare a copy 7588 // assignment operator, there is no user-declared move constructor, and 7589 // there is no user-declared move assignment operator, a copy assignment 7590 // operator is implicitly declared as defaulted. 7591 if (ShouldDeleteSpecialMember(CopyAssignment, CXXCopyAssignment)) 7592 CopyAssignment->setDeletedAsWritten(); 7593 7594 AddOverriddenMethods(ClassDecl, CopyAssignment); 7595 return CopyAssignment; 7596} 7597 7598void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 7599 CXXMethodDecl *CopyAssignOperator) { 7600 assert((CopyAssignOperator->isDefaulted() && 7601 CopyAssignOperator->isOverloadedOperator() && 7602 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 7603 !CopyAssignOperator->doesThisDeclarationHaveABody() && 7604 !CopyAssignOperator->isDeleted()) && 7605 "DefineImplicitCopyAssignment called for wrong function"); 7606 7607 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 7608 7609 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 7610 CopyAssignOperator->setInvalidDecl(); 7611 return; 7612 } 7613 7614 CopyAssignOperator->setUsed(); 7615 7616 ImplicitlyDefinedFunctionScope Scope(*this, CopyAssignOperator); 7617 DiagnosticErrorTrap Trap(Diags); 7618 7619 // C++0x [class.copy]p30: 7620 // The implicitly-defined or explicitly-defaulted copy assignment operator 7621 // for a non-union class X performs memberwise copy assignment of its 7622 // subobjects. The direct base classes of X are assigned first, in the 7623 // order of their declaration in the base-specifier-list, and then the 7624 // immediate non-static data members of X are assigned, in the order in 7625 // which they were declared in the class definition. 7626 7627 // The statements that form the synthesized function body. 7628 ASTOwningVector<Stmt*> Statements(*this); 7629 7630 // The parameter for the "other" object, which we are copying from. 7631 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 7632 Qualifiers OtherQuals = Other->getType().getQualifiers(); 7633 QualType OtherRefType = Other->getType(); 7634 if (const LValueReferenceType *OtherRef 7635 = OtherRefType->getAs<LValueReferenceType>()) { 7636 OtherRefType = OtherRef->getPointeeType(); 7637 OtherQuals = OtherRefType.getQualifiers(); 7638 } 7639 7640 // Our location for everything implicitly-generated. 7641 SourceLocation Loc = CopyAssignOperator->getLocation(); 7642 7643 // Construct a reference to the "other" object. We'll be using this 7644 // throughout the generated ASTs. 7645 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 7646 assert(OtherRef && "Reference to parameter cannot fail!"); 7647 7648 // Construct the "this" pointer. We'll be using this throughout the generated 7649 // ASTs. 7650 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 7651 assert(This && "Reference to this cannot fail!"); 7652 7653 // Assign base classes. 7654 bool Invalid = false; 7655 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7656 E = ClassDecl->bases_end(); Base != E; ++Base) { 7657 // Form the assignment: 7658 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 7659 QualType BaseType = Base->getType().getUnqualifiedType(); 7660 if (!BaseType->isRecordType()) { 7661 Invalid = true; 7662 continue; 7663 } 7664 7665 CXXCastPath BasePath; 7666 BasePath.push_back(Base); 7667 7668 // Construct the "from" expression, which is an implicit cast to the 7669 // appropriately-qualified base type. 7670 Expr *From = OtherRef; 7671 From = ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 7672 CK_UncheckedDerivedToBase, 7673 VK_LValue, &BasePath).take(); 7674 7675 // Dereference "this". 7676 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 7677 7678 // Implicitly cast "this" to the appropriately-qualified base type. 7679 To = ImpCastExprToType(To.take(), 7680 Context.getCVRQualifiedType(BaseType, 7681 CopyAssignOperator->getTypeQualifiers()), 7682 CK_UncheckedDerivedToBase, 7683 VK_LValue, &BasePath); 7684 7685 // Build the copy. 7686 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, BaseType, 7687 To.get(), From, 7688 /*CopyingBaseSubobject=*/true, 7689 /*Copying=*/true); 7690 if (Copy.isInvalid()) { 7691 Diag(CurrentLocation, diag::note_member_synthesized_at) 7692 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7693 CopyAssignOperator->setInvalidDecl(); 7694 return; 7695 } 7696 7697 // Success! Record the copy. 7698 Statements.push_back(Copy.takeAs<Expr>()); 7699 } 7700 7701 // \brief Reference to the __builtin_memcpy function. 7702 Expr *BuiltinMemCpyRef = 0; 7703 // \brief Reference to the __builtin_objc_memmove_collectable function. 7704 Expr *CollectableMemCpyRef = 0; 7705 7706 // Assign non-static members. 7707 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7708 FieldEnd = ClassDecl->field_end(); 7709 Field != FieldEnd; ++Field) { 7710 if (Field->isUnnamedBitfield()) 7711 continue; 7712 7713 // Check for members of reference type; we can't copy those. 7714 if (Field->getType()->isReferenceType()) { 7715 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 7716 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 7717 Diag(Field->getLocation(), diag::note_declared_at); 7718 Diag(CurrentLocation, diag::note_member_synthesized_at) 7719 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7720 Invalid = true; 7721 continue; 7722 } 7723 7724 // Check for members of const-qualified, non-class type. 7725 QualType BaseType = Context.getBaseElementType(Field->getType()); 7726 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 7727 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 7728 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 7729 Diag(Field->getLocation(), diag::note_declared_at); 7730 Diag(CurrentLocation, diag::note_member_synthesized_at) 7731 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7732 Invalid = true; 7733 continue; 7734 } 7735 7736 // Suppress assigning zero-width bitfields. 7737 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0) 7738 continue; 7739 7740 QualType FieldType = Field->getType().getNonReferenceType(); 7741 if (FieldType->isIncompleteArrayType()) { 7742 assert(ClassDecl->hasFlexibleArrayMember() && 7743 "Incomplete array type is not valid"); 7744 continue; 7745 } 7746 7747 // Build references to the field in the object we're copying from and to. 7748 CXXScopeSpec SS; // Intentionally empty 7749 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 7750 LookupMemberName); 7751 MemberLookup.addDecl(*Field); 7752 MemberLookup.resolveKind(); 7753 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 7754 Loc, /*IsArrow=*/false, 7755 SS, SourceLocation(), 0, 7756 MemberLookup, 0); 7757 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 7758 Loc, /*IsArrow=*/true, 7759 SS, SourceLocation(), 0, 7760 MemberLookup, 0); 7761 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 7762 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 7763 7764 // If the field should be copied with __builtin_memcpy rather than via 7765 // explicit assignments, do so. This optimization only applies for arrays 7766 // of scalars and arrays of class type with trivial copy-assignment 7767 // operators. 7768 if (FieldType->isArrayType() && !FieldType.isVolatileQualified() 7769 && BaseType.hasTrivialAssignment(Context, /*Copying=*/true)) { 7770 // Compute the size of the memory buffer to be copied. 7771 QualType SizeType = Context.getSizeType(); 7772 llvm::APInt Size(Context.getTypeSize(SizeType), 7773 Context.getTypeSizeInChars(BaseType).getQuantity()); 7774 for (const ConstantArrayType *Array 7775 = Context.getAsConstantArrayType(FieldType); 7776 Array; 7777 Array = Context.getAsConstantArrayType(Array->getElementType())) { 7778 llvm::APInt ArraySize 7779 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 7780 Size *= ArraySize; 7781 } 7782 7783 // Take the address of the field references for "from" and "to". 7784 From = CreateBuiltinUnaryOp(Loc, UO_AddrOf, From.get()); 7785 To = CreateBuiltinUnaryOp(Loc, UO_AddrOf, To.get()); 7786 7787 bool NeedsCollectableMemCpy = 7788 (BaseType->isRecordType() && 7789 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 7790 7791 if (NeedsCollectableMemCpy) { 7792 if (!CollectableMemCpyRef) { 7793 // Create a reference to the __builtin_objc_memmove_collectable function. 7794 LookupResult R(*this, 7795 &Context.Idents.get("__builtin_objc_memmove_collectable"), 7796 Loc, LookupOrdinaryName); 7797 LookupName(R, TUScope, true); 7798 7799 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 7800 if (!CollectableMemCpy) { 7801 // Something went horribly wrong earlier, and we will have 7802 // complained about it. 7803 Invalid = true; 7804 continue; 7805 } 7806 7807 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 7808 CollectableMemCpy->getType(), 7809 VK_LValue, Loc, 0).take(); 7810 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 7811 } 7812 } 7813 // Create a reference to the __builtin_memcpy builtin function. 7814 else if (!BuiltinMemCpyRef) { 7815 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 7816 LookupOrdinaryName); 7817 LookupName(R, TUScope, true); 7818 7819 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 7820 if (!BuiltinMemCpy) { 7821 // Something went horribly wrong earlier, and we will have complained 7822 // about it. 7823 Invalid = true; 7824 continue; 7825 } 7826 7827 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 7828 BuiltinMemCpy->getType(), 7829 VK_LValue, Loc, 0).take(); 7830 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 7831 } 7832 7833 ASTOwningVector<Expr*> CallArgs(*this); 7834 CallArgs.push_back(To.takeAs<Expr>()); 7835 CallArgs.push_back(From.takeAs<Expr>()); 7836 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 7837 ExprResult Call = ExprError(); 7838 if (NeedsCollectableMemCpy) 7839 Call = ActOnCallExpr(/*Scope=*/0, 7840 CollectableMemCpyRef, 7841 Loc, move_arg(CallArgs), 7842 Loc); 7843 else 7844 Call = ActOnCallExpr(/*Scope=*/0, 7845 BuiltinMemCpyRef, 7846 Loc, move_arg(CallArgs), 7847 Loc); 7848 7849 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 7850 Statements.push_back(Call.takeAs<Expr>()); 7851 continue; 7852 } 7853 7854 // Build the copy of this field. 7855 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, FieldType, 7856 To.get(), From.get(), 7857 /*CopyingBaseSubobject=*/false, 7858 /*Copying=*/true); 7859 if (Copy.isInvalid()) { 7860 Diag(CurrentLocation, diag::note_member_synthesized_at) 7861 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7862 CopyAssignOperator->setInvalidDecl(); 7863 return; 7864 } 7865 7866 // Success! Record the copy. 7867 Statements.push_back(Copy.takeAs<Stmt>()); 7868 } 7869 7870 if (!Invalid) { 7871 // Add a "return *this;" 7872 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 7873 7874 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 7875 if (Return.isInvalid()) 7876 Invalid = true; 7877 else { 7878 Statements.push_back(Return.takeAs<Stmt>()); 7879 7880 if (Trap.hasErrorOccurred()) { 7881 Diag(CurrentLocation, diag::note_member_synthesized_at) 7882 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7883 Invalid = true; 7884 } 7885 } 7886 } 7887 7888 if (Invalid) { 7889 CopyAssignOperator->setInvalidDecl(); 7890 return; 7891 } 7892 7893 StmtResult Body; 7894 { 7895 CompoundScopeRAII CompoundScope(*this); 7896 Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 7897 /*isStmtExpr=*/false); 7898 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 7899 } 7900 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 7901 7902 if (ASTMutationListener *L = getASTMutationListener()) { 7903 L->CompletedImplicitDefinition(CopyAssignOperator); 7904 } 7905} 7906 7907Sema::ImplicitExceptionSpecification 7908Sema::ComputeDefaultedMoveAssignmentExceptionSpec(CXXRecordDecl *ClassDecl) { 7909 ImplicitExceptionSpecification ExceptSpec(*this); 7910 7911 if (ClassDecl->isInvalidDecl()) 7912 return ExceptSpec; 7913 7914 // C++0x [except.spec]p14: 7915 // An implicitly declared special member function (Clause 12) shall have an 7916 // exception-specification. [...] 7917 7918 // It is unspecified whether or not an implicit move assignment operator 7919 // attempts to deduplicate calls to assignment operators of virtual bases are 7920 // made. As such, this exception specification is effectively unspecified. 7921 // Based on a similar decision made for constness in C++0x, we're erring on 7922 // the side of assuming such calls to be made regardless of whether they 7923 // actually happen. 7924 // Note that a move constructor is not implicitly declared when there are 7925 // virtual bases, but it can still be user-declared and explicitly defaulted. 7926 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7927 BaseEnd = ClassDecl->bases_end(); 7928 Base != BaseEnd; ++Base) { 7929 if (Base->isVirtual()) 7930 continue; 7931 7932 CXXRecordDecl *BaseClassDecl 7933 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7934 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 7935 false, 0)) 7936 ExceptSpec.CalledDecl(Base->getLocStart(), MoveAssign); 7937 } 7938 7939 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7940 BaseEnd = ClassDecl->vbases_end(); 7941 Base != BaseEnd; ++Base) { 7942 CXXRecordDecl *BaseClassDecl 7943 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7944 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 7945 false, 0)) 7946 ExceptSpec.CalledDecl(Base->getLocStart(), MoveAssign); 7947 } 7948 7949 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7950 FieldEnd = ClassDecl->field_end(); 7951 Field != FieldEnd; 7952 ++Field) { 7953 QualType FieldType = Context.getBaseElementType(Field->getType()); 7954 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7955 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(FieldClassDecl, 7956 false, 0)) 7957 ExceptSpec.CalledDecl(Field->getLocation(), MoveAssign); 7958 } 7959 } 7960 7961 return ExceptSpec; 7962} 7963 7964/// Determine whether the class type has any direct or indirect virtual base 7965/// classes which have a non-trivial move assignment operator. 7966static bool 7967hasVirtualBaseWithNonTrivialMoveAssignment(Sema &S, CXXRecordDecl *ClassDecl) { 7968 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7969 BaseEnd = ClassDecl->vbases_end(); 7970 Base != BaseEnd; ++Base) { 7971 CXXRecordDecl *BaseClass = 7972 cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7973 7974 // Try to declare the move assignment. If it would be deleted, then the 7975 // class does not have a non-trivial move assignment. 7976 if (BaseClass->needsImplicitMoveAssignment()) 7977 S.DeclareImplicitMoveAssignment(BaseClass); 7978 7979 // If the class has both a trivial move assignment and a non-trivial move 7980 // assignment, hasTrivialMoveAssignment() is false. 7981 if (BaseClass->hasDeclaredMoveAssignment() && 7982 !BaseClass->hasTrivialMoveAssignment()) 7983 return true; 7984 } 7985 7986 return false; 7987} 7988 7989/// Determine whether the given type either has a move constructor or is 7990/// trivially copyable. 7991static bool 7992hasMoveOrIsTriviallyCopyable(Sema &S, QualType Type, bool IsConstructor) { 7993 Type = S.Context.getBaseElementType(Type); 7994 7995 // FIXME: Technically, non-trivially-copyable non-class types, such as 7996 // reference types, are supposed to return false here, but that appears 7997 // to be a standard defect. 7998 CXXRecordDecl *ClassDecl = Type->getAsCXXRecordDecl(); 7999 if (!ClassDecl || !ClassDecl->getDefinition()) 8000 return true; 8001 8002 if (Type.isTriviallyCopyableType(S.Context)) 8003 return true; 8004 8005 if (IsConstructor) { 8006 if (ClassDecl->needsImplicitMoveConstructor()) 8007 S.DeclareImplicitMoveConstructor(ClassDecl); 8008 return ClassDecl->hasDeclaredMoveConstructor(); 8009 } 8010 8011 if (ClassDecl->needsImplicitMoveAssignment()) 8012 S.DeclareImplicitMoveAssignment(ClassDecl); 8013 return ClassDecl->hasDeclaredMoveAssignment(); 8014} 8015 8016/// Determine whether all non-static data members and direct or virtual bases 8017/// of class \p ClassDecl have either a move operation, or are trivially 8018/// copyable. 8019static bool subobjectsHaveMoveOrTrivialCopy(Sema &S, CXXRecordDecl *ClassDecl, 8020 bool IsConstructor) { 8021 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8022 BaseEnd = ClassDecl->bases_end(); 8023 Base != BaseEnd; ++Base) { 8024 if (Base->isVirtual()) 8025 continue; 8026 8027 if (!hasMoveOrIsTriviallyCopyable(S, Base->getType(), IsConstructor)) 8028 return false; 8029 } 8030 8031 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8032 BaseEnd = ClassDecl->vbases_end(); 8033 Base != BaseEnd; ++Base) { 8034 if (!hasMoveOrIsTriviallyCopyable(S, Base->getType(), IsConstructor)) 8035 return false; 8036 } 8037 8038 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8039 FieldEnd = ClassDecl->field_end(); 8040 Field != FieldEnd; ++Field) { 8041 if (!hasMoveOrIsTriviallyCopyable(S, Field->getType(), IsConstructor)) 8042 return false; 8043 } 8044 8045 return true; 8046} 8047 8048CXXMethodDecl *Sema::DeclareImplicitMoveAssignment(CXXRecordDecl *ClassDecl) { 8049 // C++11 [class.copy]p20: 8050 // If the definition of a class X does not explicitly declare a move 8051 // assignment operator, one will be implicitly declared as defaulted 8052 // if and only if: 8053 // 8054 // - [first 4 bullets] 8055 assert(ClassDecl->needsImplicitMoveAssignment()); 8056 8057 // [Checked after we build the declaration] 8058 // - the move assignment operator would not be implicitly defined as 8059 // deleted, 8060 8061 // [DR1402]: 8062 // - X has no direct or indirect virtual base class with a non-trivial 8063 // move assignment operator, and 8064 // - each of X's non-static data members and direct or virtual base classes 8065 // has a type that either has a move assignment operator or is trivially 8066 // copyable. 8067 if (hasVirtualBaseWithNonTrivialMoveAssignment(*this, ClassDecl) || 8068 !subobjectsHaveMoveOrTrivialCopy(*this, ClassDecl,/*Constructor*/false)) { 8069 ClassDecl->setFailedImplicitMoveAssignment(); 8070 return 0; 8071 } 8072 8073 // Note: The following rules are largely analoguous to the move 8074 // constructor rules. 8075 8076 ImplicitExceptionSpecification Spec( 8077 ComputeDefaultedMoveAssignmentExceptionSpec(ClassDecl)); 8078 8079 QualType ArgType = Context.getTypeDeclType(ClassDecl); 8080 QualType RetType = Context.getLValueReferenceType(ArgType); 8081 ArgType = Context.getRValueReferenceType(ArgType); 8082 8083 // An implicitly-declared move assignment operator is an inline public 8084 // member of its class. 8085 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 8086 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 8087 SourceLocation ClassLoc = ClassDecl->getLocation(); 8088 DeclarationNameInfo NameInfo(Name, ClassLoc); 8089 CXXMethodDecl *MoveAssignment 8090 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 8091 Context.getFunctionType(RetType, &ArgType, 1, EPI), 8092 /*TInfo=*/0, /*isStatic=*/false, 8093 /*StorageClassAsWritten=*/SC_None, 8094 /*isInline=*/true, 8095 /*isConstexpr=*/false, 8096 SourceLocation()); 8097 MoveAssignment->setAccess(AS_public); 8098 MoveAssignment->setDefaulted(); 8099 MoveAssignment->setImplicit(); 8100 MoveAssignment->setTrivial(ClassDecl->hasTrivialMoveAssignment()); 8101 8102 // Add the parameter to the operator. 8103 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveAssignment, 8104 ClassLoc, ClassLoc, /*Id=*/0, 8105 ArgType, /*TInfo=*/0, 8106 SC_None, 8107 SC_None, 0); 8108 MoveAssignment->setParams(FromParam); 8109 8110 // Note that we have added this copy-assignment operator. 8111 ++ASTContext::NumImplicitMoveAssignmentOperatorsDeclared; 8112 8113 // C++0x [class.copy]p9: 8114 // If the definition of a class X does not explicitly declare a move 8115 // assignment operator, one will be implicitly declared as defaulted if and 8116 // only if: 8117 // [...] 8118 // - the move assignment operator would not be implicitly defined as 8119 // deleted. 8120 if (ShouldDeleteSpecialMember(MoveAssignment, CXXMoveAssignment)) { 8121 // Cache this result so that we don't try to generate this over and over 8122 // on every lookup, leaking memory and wasting time. 8123 ClassDecl->setFailedImplicitMoveAssignment(); 8124 return 0; 8125 } 8126 8127 if (Scope *S = getScopeForContext(ClassDecl)) 8128 PushOnScopeChains(MoveAssignment, S, false); 8129 ClassDecl->addDecl(MoveAssignment); 8130 8131 AddOverriddenMethods(ClassDecl, MoveAssignment); 8132 return MoveAssignment; 8133} 8134 8135void Sema::DefineImplicitMoveAssignment(SourceLocation CurrentLocation, 8136 CXXMethodDecl *MoveAssignOperator) { 8137 assert((MoveAssignOperator->isDefaulted() && 8138 MoveAssignOperator->isOverloadedOperator() && 8139 MoveAssignOperator->getOverloadedOperator() == OO_Equal && 8140 !MoveAssignOperator->doesThisDeclarationHaveABody() && 8141 !MoveAssignOperator->isDeleted()) && 8142 "DefineImplicitMoveAssignment called for wrong function"); 8143 8144 CXXRecordDecl *ClassDecl = MoveAssignOperator->getParent(); 8145 8146 if (ClassDecl->isInvalidDecl() || MoveAssignOperator->isInvalidDecl()) { 8147 MoveAssignOperator->setInvalidDecl(); 8148 return; 8149 } 8150 8151 MoveAssignOperator->setUsed(); 8152 8153 ImplicitlyDefinedFunctionScope Scope(*this, MoveAssignOperator); 8154 DiagnosticErrorTrap Trap(Diags); 8155 8156 // C++0x [class.copy]p28: 8157 // The implicitly-defined or move assignment operator for a non-union class 8158 // X performs memberwise move assignment of its subobjects. The direct base 8159 // classes of X are assigned first, in the order of their declaration in the 8160 // base-specifier-list, and then the immediate non-static data members of X 8161 // are assigned, in the order in which they were declared in the class 8162 // definition. 8163 8164 // The statements that form the synthesized function body. 8165 ASTOwningVector<Stmt*> Statements(*this); 8166 8167 // The parameter for the "other" object, which we are move from. 8168 ParmVarDecl *Other = MoveAssignOperator->getParamDecl(0); 8169 QualType OtherRefType = Other->getType()-> 8170 getAs<RValueReferenceType>()->getPointeeType(); 8171 assert(OtherRefType.getQualifiers() == 0 && 8172 "Bad argument type of defaulted move assignment"); 8173 8174 // Our location for everything implicitly-generated. 8175 SourceLocation Loc = MoveAssignOperator->getLocation(); 8176 8177 // Construct a reference to the "other" object. We'll be using this 8178 // throughout the generated ASTs. 8179 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 8180 assert(OtherRef && "Reference to parameter cannot fail!"); 8181 // Cast to rvalue. 8182 OtherRef = CastForMoving(*this, OtherRef); 8183 8184 // Construct the "this" pointer. We'll be using this throughout the generated 8185 // ASTs. 8186 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 8187 assert(This && "Reference to this cannot fail!"); 8188 8189 // Assign base classes. 8190 bool Invalid = false; 8191 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8192 E = ClassDecl->bases_end(); Base != E; ++Base) { 8193 // Form the assignment: 8194 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&&>(other)); 8195 QualType BaseType = Base->getType().getUnqualifiedType(); 8196 if (!BaseType->isRecordType()) { 8197 Invalid = true; 8198 continue; 8199 } 8200 8201 CXXCastPath BasePath; 8202 BasePath.push_back(Base); 8203 8204 // Construct the "from" expression, which is an implicit cast to the 8205 // appropriately-qualified base type. 8206 Expr *From = OtherRef; 8207 From = ImpCastExprToType(From, BaseType, CK_UncheckedDerivedToBase, 8208 VK_XValue, &BasePath).take(); 8209 8210 // Dereference "this". 8211 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8212 8213 // Implicitly cast "this" to the appropriately-qualified base type. 8214 To = ImpCastExprToType(To.take(), 8215 Context.getCVRQualifiedType(BaseType, 8216 MoveAssignOperator->getTypeQualifiers()), 8217 CK_UncheckedDerivedToBase, 8218 VK_LValue, &BasePath); 8219 8220 // Build the move. 8221 StmtResult Move = BuildSingleCopyAssign(*this, Loc, BaseType, 8222 To.get(), From, 8223 /*CopyingBaseSubobject=*/true, 8224 /*Copying=*/false); 8225 if (Move.isInvalid()) { 8226 Diag(CurrentLocation, diag::note_member_synthesized_at) 8227 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8228 MoveAssignOperator->setInvalidDecl(); 8229 return; 8230 } 8231 8232 // Success! Record the move. 8233 Statements.push_back(Move.takeAs<Expr>()); 8234 } 8235 8236 // \brief Reference to the __builtin_memcpy function. 8237 Expr *BuiltinMemCpyRef = 0; 8238 // \brief Reference to the __builtin_objc_memmove_collectable function. 8239 Expr *CollectableMemCpyRef = 0; 8240 8241 // Assign non-static members. 8242 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8243 FieldEnd = ClassDecl->field_end(); 8244 Field != FieldEnd; ++Field) { 8245 if (Field->isUnnamedBitfield()) 8246 continue; 8247 8248 // Check for members of reference type; we can't move those. 8249 if (Field->getType()->isReferenceType()) { 8250 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8251 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 8252 Diag(Field->getLocation(), diag::note_declared_at); 8253 Diag(CurrentLocation, diag::note_member_synthesized_at) 8254 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8255 Invalid = true; 8256 continue; 8257 } 8258 8259 // Check for members of const-qualified, non-class type. 8260 QualType BaseType = Context.getBaseElementType(Field->getType()); 8261 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 8262 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8263 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 8264 Diag(Field->getLocation(), diag::note_declared_at); 8265 Diag(CurrentLocation, diag::note_member_synthesized_at) 8266 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8267 Invalid = true; 8268 continue; 8269 } 8270 8271 // Suppress assigning zero-width bitfields. 8272 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0) 8273 continue; 8274 8275 QualType FieldType = Field->getType().getNonReferenceType(); 8276 if (FieldType->isIncompleteArrayType()) { 8277 assert(ClassDecl->hasFlexibleArrayMember() && 8278 "Incomplete array type is not valid"); 8279 continue; 8280 } 8281 8282 // Build references to the field in the object we're copying from and to. 8283 CXXScopeSpec SS; // Intentionally empty 8284 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 8285 LookupMemberName); 8286 MemberLookup.addDecl(*Field); 8287 MemberLookup.resolveKind(); 8288 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 8289 Loc, /*IsArrow=*/false, 8290 SS, SourceLocation(), 0, 8291 MemberLookup, 0); 8292 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 8293 Loc, /*IsArrow=*/true, 8294 SS, SourceLocation(), 0, 8295 MemberLookup, 0); 8296 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 8297 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 8298 8299 assert(!From.get()->isLValue() && // could be xvalue or prvalue 8300 "Member reference with rvalue base must be rvalue except for reference " 8301 "members, which aren't allowed for move assignment."); 8302 8303 // If the field should be copied with __builtin_memcpy rather than via 8304 // explicit assignments, do so. This optimization only applies for arrays 8305 // of scalars and arrays of class type with trivial move-assignment 8306 // operators. 8307 if (FieldType->isArrayType() && !FieldType.isVolatileQualified() 8308 && BaseType.hasTrivialAssignment(Context, /*Copying=*/false)) { 8309 // Compute the size of the memory buffer to be copied. 8310 QualType SizeType = Context.getSizeType(); 8311 llvm::APInt Size(Context.getTypeSize(SizeType), 8312 Context.getTypeSizeInChars(BaseType).getQuantity()); 8313 for (const ConstantArrayType *Array 8314 = Context.getAsConstantArrayType(FieldType); 8315 Array; 8316 Array = Context.getAsConstantArrayType(Array->getElementType())) { 8317 llvm::APInt ArraySize 8318 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 8319 Size *= ArraySize; 8320 } 8321 8322 // Take the address of the field references for "from" and "to". We 8323 // directly construct UnaryOperators here because semantic analysis 8324 // does not permit us to take the address of an xvalue. 8325 From = new (Context) UnaryOperator(From.get(), UO_AddrOf, 8326 Context.getPointerType(From.get()->getType()), 8327 VK_RValue, OK_Ordinary, Loc); 8328 To = new (Context) UnaryOperator(To.get(), UO_AddrOf, 8329 Context.getPointerType(To.get()->getType()), 8330 VK_RValue, OK_Ordinary, Loc); 8331 8332 bool NeedsCollectableMemCpy = 8333 (BaseType->isRecordType() && 8334 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 8335 8336 if (NeedsCollectableMemCpy) { 8337 if (!CollectableMemCpyRef) { 8338 // Create a reference to the __builtin_objc_memmove_collectable function. 8339 LookupResult R(*this, 8340 &Context.Idents.get("__builtin_objc_memmove_collectable"), 8341 Loc, LookupOrdinaryName); 8342 LookupName(R, TUScope, true); 8343 8344 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 8345 if (!CollectableMemCpy) { 8346 // Something went horribly wrong earlier, and we will have 8347 // complained about it. 8348 Invalid = true; 8349 continue; 8350 } 8351 8352 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 8353 CollectableMemCpy->getType(), 8354 VK_LValue, Loc, 0).take(); 8355 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 8356 } 8357 } 8358 // Create a reference to the __builtin_memcpy builtin function. 8359 else if (!BuiltinMemCpyRef) { 8360 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 8361 LookupOrdinaryName); 8362 LookupName(R, TUScope, true); 8363 8364 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 8365 if (!BuiltinMemCpy) { 8366 // Something went horribly wrong earlier, and we will have complained 8367 // about it. 8368 Invalid = true; 8369 continue; 8370 } 8371 8372 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 8373 BuiltinMemCpy->getType(), 8374 VK_LValue, Loc, 0).take(); 8375 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 8376 } 8377 8378 ASTOwningVector<Expr*> CallArgs(*this); 8379 CallArgs.push_back(To.takeAs<Expr>()); 8380 CallArgs.push_back(From.takeAs<Expr>()); 8381 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 8382 ExprResult Call = ExprError(); 8383 if (NeedsCollectableMemCpy) 8384 Call = ActOnCallExpr(/*Scope=*/0, 8385 CollectableMemCpyRef, 8386 Loc, move_arg(CallArgs), 8387 Loc); 8388 else 8389 Call = ActOnCallExpr(/*Scope=*/0, 8390 BuiltinMemCpyRef, 8391 Loc, move_arg(CallArgs), 8392 Loc); 8393 8394 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 8395 Statements.push_back(Call.takeAs<Expr>()); 8396 continue; 8397 } 8398 8399 // Build the move of this field. 8400 StmtResult Move = BuildSingleCopyAssign(*this, Loc, FieldType, 8401 To.get(), From.get(), 8402 /*CopyingBaseSubobject=*/false, 8403 /*Copying=*/false); 8404 if (Move.isInvalid()) { 8405 Diag(CurrentLocation, diag::note_member_synthesized_at) 8406 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8407 MoveAssignOperator->setInvalidDecl(); 8408 return; 8409 } 8410 8411 // Success! Record the copy. 8412 Statements.push_back(Move.takeAs<Stmt>()); 8413 } 8414 8415 if (!Invalid) { 8416 // Add a "return *this;" 8417 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8418 8419 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 8420 if (Return.isInvalid()) 8421 Invalid = true; 8422 else { 8423 Statements.push_back(Return.takeAs<Stmt>()); 8424 8425 if (Trap.hasErrorOccurred()) { 8426 Diag(CurrentLocation, diag::note_member_synthesized_at) 8427 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8428 Invalid = true; 8429 } 8430 } 8431 } 8432 8433 if (Invalid) { 8434 MoveAssignOperator->setInvalidDecl(); 8435 return; 8436 } 8437 8438 StmtResult Body; 8439 { 8440 CompoundScopeRAII CompoundScope(*this); 8441 Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 8442 /*isStmtExpr=*/false); 8443 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 8444 } 8445 MoveAssignOperator->setBody(Body.takeAs<Stmt>()); 8446 8447 if (ASTMutationListener *L = getASTMutationListener()) { 8448 L->CompletedImplicitDefinition(MoveAssignOperator); 8449 } 8450} 8451 8452std::pair<Sema::ImplicitExceptionSpecification, bool> 8453Sema::ComputeDefaultedCopyCtorExceptionSpecAndConst(CXXRecordDecl *ClassDecl) { 8454 if (ClassDecl->isInvalidDecl()) 8455 return std::make_pair(ImplicitExceptionSpecification(*this), true); 8456 8457 // C++ [class.copy]p5: 8458 // The implicitly-declared copy constructor for a class X will 8459 // have the form 8460 // 8461 // X::X(const X&) 8462 // 8463 // if 8464 // FIXME: It ought to be possible to store this on the record. 8465 bool HasConstCopyConstructor = true; 8466 8467 // -- each direct or virtual base class B of X has a copy 8468 // constructor whose first parameter is of type const B& or 8469 // const volatile B&, and 8470 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8471 BaseEnd = ClassDecl->bases_end(); 8472 HasConstCopyConstructor && Base != BaseEnd; 8473 ++Base) { 8474 // Virtual bases are handled below. 8475 if (Base->isVirtual()) 8476 continue; 8477 8478 CXXRecordDecl *BaseClassDecl 8479 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8480 HasConstCopyConstructor &= 8481 (bool)LookupCopyingConstructor(BaseClassDecl, Qualifiers::Const); 8482 } 8483 8484 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8485 BaseEnd = ClassDecl->vbases_end(); 8486 HasConstCopyConstructor && Base != BaseEnd; 8487 ++Base) { 8488 CXXRecordDecl *BaseClassDecl 8489 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8490 HasConstCopyConstructor &= 8491 (bool)LookupCopyingConstructor(BaseClassDecl, Qualifiers::Const); 8492 } 8493 8494 // -- for all the nonstatic data members of X that are of a 8495 // class type M (or array thereof), each such class type 8496 // has a copy constructor whose first parameter is of type 8497 // const M& or const volatile M&. 8498 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8499 FieldEnd = ClassDecl->field_end(); 8500 HasConstCopyConstructor && Field != FieldEnd; 8501 ++Field) { 8502 QualType FieldType = Context.getBaseElementType(Field->getType()); 8503 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8504 HasConstCopyConstructor &= 8505 (bool)LookupCopyingConstructor(FieldClassDecl, Qualifiers::Const); 8506 } 8507 } 8508 // Otherwise, the implicitly declared copy constructor will have 8509 // the form 8510 // 8511 // X::X(X&) 8512 8513 // C++ [except.spec]p14: 8514 // An implicitly declared special member function (Clause 12) shall have an 8515 // exception-specification. [...] 8516 ImplicitExceptionSpecification ExceptSpec(*this); 8517 unsigned Quals = HasConstCopyConstructor? Qualifiers::Const : 0; 8518 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8519 BaseEnd = ClassDecl->bases_end(); 8520 Base != BaseEnd; 8521 ++Base) { 8522 // Virtual bases are handled below. 8523 if (Base->isVirtual()) 8524 continue; 8525 8526 CXXRecordDecl *BaseClassDecl 8527 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8528 if (CXXConstructorDecl *CopyConstructor = 8529 LookupCopyingConstructor(BaseClassDecl, Quals)) 8530 ExceptSpec.CalledDecl(Base->getLocStart(), CopyConstructor); 8531 } 8532 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8533 BaseEnd = ClassDecl->vbases_end(); 8534 Base != BaseEnd; 8535 ++Base) { 8536 CXXRecordDecl *BaseClassDecl 8537 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8538 if (CXXConstructorDecl *CopyConstructor = 8539 LookupCopyingConstructor(BaseClassDecl, Quals)) 8540 ExceptSpec.CalledDecl(Base->getLocStart(), CopyConstructor); 8541 } 8542 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8543 FieldEnd = ClassDecl->field_end(); 8544 Field != FieldEnd; 8545 ++Field) { 8546 QualType FieldType = Context.getBaseElementType(Field->getType()); 8547 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8548 if (CXXConstructorDecl *CopyConstructor = 8549 LookupCopyingConstructor(FieldClassDecl, Quals)) 8550 ExceptSpec.CalledDecl(Field->getLocation(), CopyConstructor); 8551 } 8552 } 8553 8554 return std::make_pair(ExceptSpec, HasConstCopyConstructor); 8555} 8556 8557CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 8558 CXXRecordDecl *ClassDecl) { 8559 // C++ [class.copy]p4: 8560 // If the class definition does not explicitly declare a copy 8561 // constructor, one is declared implicitly. 8562 8563 ImplicitExceptionSpecification Spec(*this); 8564 bool Const; 8565 llvm::tie(Spec, Const) = 8566 ComputeDefaultedCopyCtorExceptionSpecAndConst(ClassDecl); 8567 8568 QualType ClassType = Context.getTypeDeclType(ClassDecl); 8569 QualType ArgType = ClassType; 8570 if (Const) 8571 ArgType = ArgType.withConst(); 8572 ArgType = Context.getLValueReferenceType(ArgType); 8573 8574 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 8575 8576 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, 8577 CXXCopyConstructor, 8578 Const); 8579 8580 DeclarationName Name 8581 = Context.DeclarationNames.getCXXConstructorName( 8582 Context.getCanonicalType(ClassType)); 8583 SourceLocation ClassLoc = ClassDecl->getLocation(); 8584 DeclarationNameInfo NameInfo(Name, ClassLoc); 8585 8586 // An implicitly-declared copy constructor is an inline public 8587 // member of its class. 8588 CXXConstructorDecl *CopyConstructor = CXXConstructorDecl::Create( 8589 Context, ClassDecl, ClassLoc, NameInfo, 8590 Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI), /*TInfo=*/0, 8591 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 8592 Constexpr); 8593 CopyConstructor->setAccess(AS_public); 8594 CopyConstructor->setDefaulted(); 8595 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 8596 8597 // Note that we have declared this constructor. 8598 ++ASTContext::NumImplicitCopyConstructorsDeclared; 8599 8600 // Add the parameter to the constructor. 8601 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 8602 ClassLoc, ClassLoc, 8603 /*IdentifierInfo=*/0, 8604 ArgType, /*TInfo=*/0, 8605 SC_None, 8606 SC_None, 0); 8607 CopyConstructor->setParams(FromParam); 8608 8609 if (Scope *S = getScopeForContext(ClassDecl)) 8610 PushOnScopeChains(CopyConstructor, S, false); 8611 ClassDecl->addDecl(CopyConstructor); 8612 8613 // C++11 [class.copy]p8: 8614 // ... If the class definition does not explicitly declare a copy 8615 // constructor, there is no user-declared move constructor, and there is no 8616 // user-declared move assignment operator, a copy constructor is implicitly 8617 // declared as defaulted. 8618 if (ShouldDeleteSpecialMember(CopyConstructor, CXXCopyConstructor)) 8619 CopyConstructor->setDeletedAsWritten(); 8620 8621 return CopyConstructor; 8622} 8623 8624void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 8625 CXXConstructorDecl *CopyConstructor) { 8626 assert((CopyConstructor->isDefaulted() && 8627 CopyConstructor->isCopyConstructor() && 8628 !CopyConstructor->doesThisDeclarationHaveABody() && 8629 !CopyConstructor->isDeleted()) && 8630 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 8631 8632 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 8633 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 8634 8635 ImplicitlyDefinedFunctionScope Scope(*this, CopyConstructor); 8636 DiagnosticErrorTrap Trap(Diags); 8637 8638 if (SetCtorInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) || 8639 Trap.hasErrorOccurred()) { 8640 Diag(CurrentLocation, diag::note_member_synthesized_at) 8641 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 8642 CopyConstructor->setInvalidDecl(); 8643 } else { 8644 Sema::CompoundScopeRAII CompoundScope(*this); 8645 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 8646 CopyConstructor->getLocation(), 8647 MultiStmtArg(*this, 0, 0), 8648 /*isStmtExpr=*/false) 8649 .takeAs<Stmt>()); 8650 CopyConstructor->setImplicitlyDefined(true); 8651 } 8652 8653 CopyConstructor->setUsed(); 8654 if (ASTMutationListener *L = getASTMutationListener()) { 8655 L->CompletedImplicitDefinition(CopyConstructor); 8656 } 8657} 8658 8659Sema::ImplicitExceptionSpecification 8660Sema::ComputeDefaultedMoveCtorExceptionSpec(CXXRecordDecl *ClassDecl) { 8661 // C++ [except.spec]p14: 8662 // An implicitly declared special member function (Clause 12) shall have an 8663 // exception-specification. [...] 8664 ImplicitExceptionSpecification ExceptSpec(*this); 8665 if (ClassDecl->isInvalidDecl()) 8666 return ExceptSpec; 8667 8668 // Direct base-class constructors. 8669 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 8670 BEnd = ClassDecl->bases_end(); 8671 B != BEnd; ++B) { 8672 if (B->isVirtual()) // Handled below. 8673 continue; 8674 8675 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 8676 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 8677 CXXConstructorDecl *Constructor = LookupMovingConstructor(BaseClassDecl); 8678 // If this is a deleted function, add it anyway. This might be conformant 8679 // with the standard. This might not. I'm not sure. It might not matter. 8680 if (Constructor) 8681 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 8682 } 8683 } 8684 8685 // Virtual base-class constructors. 8686 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 8687 BEnd = ClassDecl->vbases_end(); 8688 B != BEnd; ++B) { 8689 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 8690 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 8691 CXXConstructorDecl *Constructor = LookupMovingConstructor(BaseClassDecl); 8692 // If this is a deleted function, add it anyway. This might be conformant 8693 // with the standard. This might not. I'm not sure. It might not matter. 8694 if (Constructor) 8695 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 8696 } 8697 } 8698 8699 // Field constructors. 8700 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 8701 FEnd = ClassDecl->field_end(); 8702 F != FEnd; ++F) { 8703 if (const RecordType *RecordTy 8704 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 8705 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 8706 CXXConstructorDecl *Constructor = LookupMovingConstructor(FieldRecDecl); 8707 // If this is a deleted function, add it anyway. This might be conformant 8708 // with the standard. This might not. I'm not sure. It might not matter. 8709 // In particular, the problem is that this function never gets called. It 8710 // might just be ill-formed because this function attempts to refer to 8711 // a deleted function here. 8712 if (Constructor) 8713 ExceptSpec.CalledDecl(F->getLocation(), Constructor); 8714 } 8715 } 8716 8717 return ExceptSpec; 8718} 8719 8720CXXConstructorDecl *Sema::DeclareImplicitMoveConstructor( 8721 CXXRecordDecl *ClassDecl) { 8722 // C++11 [class.copy]p9: 8723 // If the definition of a class X does not explicitly declare a move 8724 // constructor, one will be implicitly declared as defaulted if and only if: 8725 // 8726 // - [first 4 bullets] 8727 assert(ClassDecl->needsImplicitMoveConstructor()); 8728 8729 // [Checked after we build the declaration] 8730 // - the move assignment operator would not be implicitly defined as 8731 // deleted, 8732 8733 // [DR1402]: 8734 // - each of X's non-static data members and direct or virtual base classes 8735 // has a type that either has a move constructor or is trivially copyable. 8736 if (!subobjectsHaveMoveOrTrivialCopy(*this, ClassDecl, /*Constructor*/true)) { 8737 ClassDecl->setFailedImplicitMoveConstructor(); 8738 return 0; 8739 } 8740 8741 ImplicitExceptionSpecification Spec( 8742 ComputeDefaultedMoveCtorExceptionSpec(ClassDecl)); 8743 8744 QualType ClassType = Context.getTypeDeclType(ClassDecl); 8745 QualType ArgType = Context.getRValueReferenceType(ClassType); 8746 8747 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 8748 8749 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, 8750 CXXMoveConstructor, 8751 false); 8752 8753 DeclarationName Name 8754 = Context.DeclarationNames.getCXXConstructorName( 8755 Context.getCanonicalType(ClassType)); 8756 SourceLocation ClassLoc = ClassDecl->getLocation(); 8757 DeclarationNameInfo NameInfo(Name, ClassLoc); 8758 8759 // C++0x [class.copy]p11: 8760 // An implicitly-declared copy/move constructor is an inline public 8761 // member of its class. 8762 CXXConstructorDecl *MoveConstructor = CXXConstructorDecl::Create( 8763 Context, ClassDecl, ClassLoc, NameInfo, 8764 Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI), /*TInfo=*/0, 8765 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 8766 Constexpr); 8767 MoveConstructor->setAccess(AS_public); 8768 MoveConstructor->setDefaulted(); 8769 MoveConstructor->setTrivial(ClassDecl->hasTrivialMoveConstructor()); 8770 8771 // Add the parameter to the constructor. 8772 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveConstructor, 8773 ClassLoc, ClassLoc, 8774 /*IdentifierInfo=*/0, 8775 ArgType, /*TInfo=*/0, 8776 SC_None, 8777 SC_None, 0); 8778 MoveConstructor->setParams(FromParam); 8779 8780 // C++0x [class.copy]p9: 8781 // If the definition of a class X does not explicitly declare a move 8782 // constructor, one will be implicitly declared as defaulted if and only if: 8783 // [...] 8784 // - the move constructor would not be implicitly defined as deleted. 8785 if (ShouldDeleteSpecialMember(MoveConstructor, CXXMoveConstructor)) { 8786 // Cache this result so that we don't try to generate this over and over 8787 // on every lookup, leaking memory and wasting time. 8788 ClassDecl->setFailedImplicitMoveConstructor(); 8789 return 0; 8790 } 8791 8792 // Note that we have declared this constructor. 8793 ++ASTContext::NumImplicitMoveConstructorsDeclared; 8794 8795 if (Scope *S = getScopeForContext(ClassDecl)) 8796 PushOnScopeChains(MoveConstructor, S, false); 8797 ClassDecl->addDecl(MoveConstructor); 8798 8799 return MoveConstructor; 8800} 8801 8802void Sema::DefineImplicitMoveConstructor(SourceLocation CurrentLocation, 8803 CXXConstructorDecl *MoveConstructor) { 8804 assert((MoveConstructor->isDefaulted() && 8805 MoveConstructor->isMoveConstructor() && 8806 !MoveConstructor->doesThisDeclarationHaveABody() && 8807 !MoveConstructor->isDeleted()) && 8808 "DefineImplicitMoveConstructor - call it for implicit move ctor"); 8809 8810 CXXRecordDecl *ClassDecl = MoveConstructor->getParent(); 8811 assert(ClassDecl && "DefineImplicitMoveConstructor - invalid constructor"); 8812 8813 ImplicitlyDefinedFunctionScope Scope(*this, MoveConstructor); 8814 DiagnosticErrorTrap Trap(Diags); 8815 8816 if (SetCtorInitializers(MoveConstructor, 0, 0, /*AnyErrors=*/false) || 8817 Trap.hasErrorOccurred()) { 8818 Diag(CurrentLocation, diag::note_member_synthesized_at) 8819 << CXXMoveConstructor << Context.getTagDeclType(ClassDecl); 8820 MoveConstructor->setInvalidDecl(); 8821 } else { 8822 Sema::CompoundScopeRAII CompoundScope(*this); 8823 MoveConstructor->setBody(ActOnCompoundStmt(MoveConstructor->getLocation(), 8824 MoveConstructor->getLocation(), 8825 MultiStmtArg(*this, 0, 0), 8826 /*isStmtExpr=*/false) 8827 .takeAs<Stmt>()); 8828 MoveConstructor->setImplicitlyDefined(true); 8829 } 8830 8831 MoveConstructor->setUsed(); 8832 8833 if (ASTMutationListener *L = getASTMutationListener()) { 8834 L->CompletedImplicitDefinition(MoveConstructor); 8835 } 8836} 8837 8838bool Sema::isImplicitlyDeleted(FunctionDecl *FD) { 8839 return FD->isDeleted() && 8840 (FD->isDefaulted() || FD->isImplicit()) && 8841 isa<CXXMethodDecl>(FD); 8842} 8843 8844/// \brief Mark the call operator of the given lambda closure type as "used". 8845static void markLambdaCallOperatorUsed(Sema &S, CXXRecordDecl *Lambda) { 8846 CXXMethodDecl *CallOperator 8847 = cast<CXXMethodDecl>( 8848 *Lambda->lookup( 8849 S.Context.DeclarationNames.getCXXOperatorName(OO_Call)).first); 8850 CallOperator->setReferenced(); 8851 CallOperator->setUsed(); 8852} 8853 8854void Sema::DefineImplicitLambdaToFunctionPointerConversion( 8855 SourceLocation CurrentLocation, 8856 CXXConversionDecl *Conv) 8857{ 8858 CXXRecordDecl *Lambda = Conv->getParent(); 8859 8860 // Make sure that the lambda call operator is marked used. 8861 markLambdaCallOperatorUsed(*this, Lambda); 8862 8863 Conv->setUsed(); 8864 8865 ImplicitlyDefinedFunctionScope Scope(*this, Conv); 8866 DiagnosticErrorTrap Trap(Diags); 8867 8868 // Return the address of the __invoke function. 8869 DeclarationName InvokeName = &Context.Idents.get("__invoke"); 8870 CXXMethodDecl *Invoke 8871 = cast<CXXMethodDecl>(*Lambda->lookup(InvokeName).first); 8872 Expr *FunctionRef = BuildDeclRefExpr(Invoke, Invoke->getType(), 8873 VK_LValue, Conv->getLocation()).take(); 8874 assert(FunctionRef && "Can't refer to __invoke function?"); 8875 Stmt *Return = ActOnReturnStmt(Conv->getLocation(), FunctionRef).take(); 8876 Conv->setBody(new (Context) CompoundStmt(Context, &Return, 1, 8877 Conv->getLocation(), 8878 Conv->getLocation())); 8879 8880 // Fill in the __invoke function with a dummy implementation. IR generation 8881 // will fill in the actual details. 8882 Invoke->setUsed(); 8883 Invoke->setReferenced(); 8884 Invoke->setBody(new (Context) CompoundStmt(Context, 0, 0, Conv->getLocation(), 8885 Conv->getLocation())); 8886 8887 if (ASTMutationListener *L = getASTMutationListener()) { 8888 L->CompletedImplicitDefinition(Conv); 8889 L->CompletedImplicitDefinition(Invoke); 8890 } 8891} 8892 8893void Sema::DefineImplicitLambdaToBlockPointerConversion( 8894 SourceLocation CurrentLocation, 8895 CXXConversionDecl *Conv) 8896{ 8897 Conv->setUsed(); 8898 8899 ImplicitlyDefinedFunctionScope Scope(*this, Conv); 8900 DiagnosticErrorTrap Trap(Diags); 8901 8902 // Copy-initialize the lambda object as needed to capture it. 8903 Expr *This = ActOnCXXThis(CurrentLocation).take(); 8904 Expr *DerefThis =CreateBuiltinUnaryOp(CurrentLocation, UO_Deref, This).take(); 8905 8906 ExprResult BuildBlock = BuildBlockForLambdaConversion(CurrentLocation, 8907 Conv->getLocation(), 8908 Conv, DerefThis); 8909 8910 // If we're not under ARC, make sure we still get the _Block_copy/autorelease 8911 // behavior. Note that only the general conversion function does this 8912 // (since it's unusable otherwise); in the case where we inline the 8913 // block literal, it has block literal lifetime semantics. 8914 if (!BuildBlock.isInvalid() && !getLangOpts().ObjCAutoRefCount) 8915 BuildBlock = ImplicitCastExpr::Create(Context, BuildBlock.get()->getType(), 8916 CK_CopyAndAutoreleaseBlockObject, 8917 BuildBlock.get(), 0, VK_RValue); 8918 8919 if (BuildBlock.isInvalid()) { 8920 Diag(CurrentLocation, diag::note_lambda_to_block_conv); 8921 Conv->setInvalidDecl(); 8922 return; 8923 } 8924 8925 // Create the return statement that returns the block from the conversion 8926 // function. 8927 StmtResult Return = ActOnReturnStmt(Conv->getLocation(), BuildBlock.get()); 8928 if (Return.isInvalid()) { 8929 Diag(CurrentLocation, diag::note_lambda_to_block_conv); 8930 Conv->setInvalidDecl(); 8931 return; 8932 } 8933 8934 // Set the body of the conversion function. 8935 Stmt *ReturnS = Return.take(); 8936 Conv->setBody(new (Context) CompoundStmt(Context, &ReturnS, 1, 8937 Conv->getLocation(), 8938 Conv->getLocation())); 8939 8940 // We're done; notify the mutation listener, if any. 8941 if (ASTMutationListener *L = getASTMutationListener()) { 8942 L->CompletedImplicitDefinition(Conv); 8943 } 8944} 8945 8946/// \brief Determine whether the given list arguments contains exactly one 8947/// "real" (non-default) argument. 8948static bool hasOneRealArgument(MultiExprArg Args) { 8949 switch (Args.size()) { 8950 case 0: 8951 return false; 8952 8953 default: 8954 if (!Args.get()[1]->isDefaultArgument()) 8955 return false; 8956 8957 // fall through 8958 case 1: 8959 return !Args.get()[0]->isDefaultArgument(); 8960 } 8961 8962 return false; 8963} 8964 8965ExprResult 8966Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 8967 CXXConstructorDecl *Constructor, 8968 MultiExprArg ExprArgs, 8969 bool HadMultipleCandidates, 8970 bool RequiresZeroInit, 8971 unsigned ConstructKind, 8972 SourceRange ParenRange) { 8973 bool Elidable = false; 8974 8975 // C++0x [class.copy]p34: 8976 // When certain criteria are met, an implementation is allowed to 8977 // omit the copy/move construction of a class object, even if the 8978 // copy/move constructor and/or destructor for the object have 8979 // side effects. [...] 8980 // - when a temporary class object that has not been bound to a 8981 // reference (12.2) would be copied/moved to a class object 8982 // with the same cv-unqualified type, the copy/move operation 8983 // can be omitted by constructing the temporary object 8984 // directly into the target of the omitted copy/move 8985 if (ConstructKind == CXXConstructExpr::CK_Complete && 8986 Constructor->isCopyOrMoveConstructor() && hasOneRealArgument(ExprArgs)) { 8987 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 8988 Elidable = SubExpr->isTemporaryObject(Context, Constructor->getParent()); 8989 } 8990 8991 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 8992 Elidable, move(ExprArgs), HadMultipleCandidates, 8993 RequiresZeroInit, ConstructKind, ParenRange); 8994} 8995 8996/// BuildCXXConstructExpr - Creates a complete call to a constructor, 8997/// including handling of its default argument expressions. 8998ExprResult 8999Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 9000 CXXConstructorDecl *Constructor, bool Elidable, 9001 MultiExprArg ExprArgs, 9002 bool HadMultipleCandidates, 9003 bool RequiresZeroInit, 9004 unsigned ConstructKind, 9005 SourceRange ParenRange) { 9006 unsigned NumExprs = ExprArgs.size(); 9007 Expr **Exprs = (Expr **)ExprArgs.release(); 9008 9009 for (specific_attr_iterator<NonNullAttr> 9010 i = Constructor->specific_attr_begin<NonNullAttr>(), 9011 e = Constructor->specific_attr_end<NonNullAttr>(); i != e; ++i) { 9012 const NonNullAttr *NonNull = *i; 9013 CheckNonNullArguments(NonNull, ExprArgs.get(), ConstructLoc); 9014 } 9015 9016 MarkFunctionReferenced(ConstructLoc, Constructor); 9017 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 9018 Constructor, Elidable, Exprs, NumExprs, 9019 HadMultipleCandidates, /*FIXME*/false, 9020 RequiresZeroInit, 9021 static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind), 9022 ParenRange)); 9023} 9024 9025bool Sema::InitializeVarWithConstructor(VarDecl *VD, 9026 CXXConstructorDecl *Constructor, 9027 MultiExprArg Exprs, 9028 bool HadMultipleCandidates) { 9029 // FIXME: Provide the correct paren SourceRange when available. 9030 ExprResult TempResult = 9031 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 9032 move(Exprs), HadMultipleCandidates, false, 9033 CXXConstructExpr::CK_Complete, SourceRange()); 9034 if (TempResult.isInvalid()) 9035 return true; 9036 9037 Expr *Temp = TempResult.takeAs<Expr>(); 9038 CheckImplicitConversions(Temp, VD->getLocation()); 9039 MarkFunctionReferenced(VD->getLocation(), Constructor); 9040 Temp = MaybeCreateExprWithCleanups(Temp); 9041 VD->setInit(Temp); 9042 9043 return false; 9044} 9045 9046void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 9047 if (VD->isInvalidDecl()) return; 9048 9049 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 9050 if (ClassDecl->isInvalidDecl()) return; 9051 if (ClassDecl->hasIrrelevantDestructor()) return; 9052 if (ClassDecl->isDependentContext()) return; 9053 9054 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 9055 MarkFunctionReferenced(VD->getLocation(), Destructor); 9056 CheckDestructorAccess(VD->getLocation(), Destructor, 9057 PDiag(diag::err_access_dtor_var) 9058 << VD->getDeclName() 9059 << VD->getType()); 9060 DiagnoseUseOfDecl(Destructor, VD->getLocation()); 9061 9062 if (!VD->hasGlobalStorage()) return; 9063 9064 // Emit warning for non-trivial dtor in global scope (a real global, 9065 // class-static, function-static). 9066 Diag(VD->getLocation(), diag::warn_exit_time_destructor); 9067 9068 // TODO: this should be re-enabled for static locals by !CXAAtExit 9069 if (!VD->isStaticLocal()) 9070 Diag(VD->getLocation(), diag::warn_global_destructor); 9071} 9072 9073/// \brief Given a constructor and the set of arguments provided for the 9074/// constructor, convert the arguments and add any required default arguments 9075/// to form a proper call to this constructor. 9076/// 9077/// \returns true if an error occurred, false otherwise. 9078bool 9079Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 9080 MultiExprArg ArgsPtr, 9081 SourceLocation Loc, 9082 ASTOwningVector<Expr*> &ConvertedArgs, 9083 bool AllowExplicit) { 9084 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 9085 unsigned NumArgs = ArgsPtr.size(); 9086 Expr **Args = (Expr **)ArgsPtr.get(); 9087 9088 const FunctionProtoType *Proto 9089 = Constructor->getType()->getAs<FunctionProtoType>(); 9090 assert(Proto && "Constructor without a prototype?"); 9091 unsigned NumArgsInProto = Proto->getNumArgs(); 9092 9093 // If too few arguments are available, we'll fill in the rest with defaults. 9094 if (NumArgs < NumArgsInProto) 9095 ConvertedArgs.reserve(NumArgsInProto); 9096 else 9097 ConvertedArgs.reserve(NumArgs); 9098 9099 VariadicCallType CallType = 9100 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 9101 SmallVector<Expr *, 8> AllArgs; 9102 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 9103 Proto, 0, Args, NumArgs, AllArgs, 9104 CallType, AllowExplicit); 9105 ConvertedArgs.append(AllArgs.begin(), AllArgs.end()); 9106 9107 DiagnoseSentinelCalls(Constructor, Loc, AllArgs.data(), AllArgs.size()); 9108 9109 // FIXME: Missing call to CheckFunctionCall or equivalent 9110 9111 return Invalid; 9112} 9113 9114static inline bool 9115CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 9116 const FunctionDecl *FnDecl) { 9117 const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext(); 9118 if (isa<NamespaceDecl>(DC)) { 9119 return SemaRef.Diag(FnDecl->getLocation(), 9120 diag::err_operator_new_delete_declared_in_namespace) 9121 << FnDecl->getDeclName(); 9122 } 9123 9124 if (isa<TranslationUnitDecl>(DC) && 9125 FnDecl->getStorageClass() == SC_Static) { 9126 return SemaRef.Diag(FnDecl->getLocation(), 9127 diag::err_operator_new_delete_declared_static) 9128 << FnDecl->getDeclName(); 9129 } 9130 9131 return false; 9132} 9133 9134static inline bool 9135CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 9136 CanQualType ExpectedResultType, 9137 CanQualType ExpectedFirstParamType, 9138 unsigned DependentParamTypeDiag, 9139 unsigned InvalidParamTypeDiag) { 9140 QualType ResultType = 9141 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 9142 9143 // Check that the result type is not dependent. 9144 if (ResultType->isDependentType()) 9145 return SemaRef.Diag(FnDecl->getLocation(), 9146 diag::err_operator_new_delete_dependent_result_type) 9147 << FnDecl->getDeclName() << ExpectedResultType; 9148 9149 // Check that the result type is what we expect. 9150 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 9151 return SemaRef.Diag(FnDecl->getLocation(), 9152 diag::err_operator_new_delete_invalid_result_type) 9153 << FnDecl->getDeclName() << ExpectedResultType; 9154 9155 // A function template must have at least 2 parameters. 9156 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 9157 return SemaRef.Diag(FnDecl->getLocation(), 9158 diag::err_operator_new_delete_template_too_few_parameters) 9159 << FnDecl->getDeclName(); 9160 9161 // The function decl must have at least 1 parameter. 9162 if (FnDecl->getNumParams() == 0) 9163 return SemaRef.Diag(FnDecl->getLocation(), 9164 diag::err_operator_new_delete_too_few_parameters) 9165 << FnDecl->getDeclName(); 9166 9167 // Check the the first parameter type is not dependent. 9168 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 9169 if (FirstParamType->isDependentType()) 9170 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 9171 << FnDecl->getDeclName() << ExpectedFirstParamType; 9172 9173 // Check that the first parameter type is what we expect. 9174 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 9175 ExpectedFirstParamType) 9176 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 9177 << FnDecl->getDeclName() << ExpectedFirstParamType; 9178 9179 return false; 9180} 9181 9182static bool 9183CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 9184 // C++ [basic.stc.dynamic.allocation]p1: 9185 // A program is ill-formed if an allocation function is declared in a 9186 // namespace scope other than global scope or declared static in global 9187 // scope. 9188 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 9189 return true; 9190 9191 CanQualType SizeTy = 9192 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 9193 9194 // C++ [basic.stc.dynamic.allocation]p1: 9195 // The return type shall be void*. The first parameter shall have type 9196 // std::size_t. 9197 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 9198 SizeTy, 9199 diag::err_operator_new_dependent_param_type, 9200 diag::err_operator_new_param_type)) 9201 return true; 9202 9203 // C++ [basic.stc.dynamic.allocation]p1: 9204 // The first parameter shall not have an associated default argument. 9205 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 9206 return SemaRef.Diag(FnDecl->getLocation(), 9207 diag::err_operator_new_default_arg) 9208 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 9209 9210 return false; 9211} 9212 9213static bool 9214CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 9215 // C++ [basic.stc.dynamic.deallocation]p1: 9216 // A program is ill-formed if deallocation functions are declared in a 9217 // namespace scope other than global scope or declared static in global 9218 // scope. 9219 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 9220 return true; 9221 9222 // C++ [basic.stc.dynamic.deallocation]p2: 9223 // Each deallocation function shall return void and its first parameter 9224 // shall be void*. 9225 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 9226 SemaRef.Context.VoidPtrTy, 9227 diag::err_operator_delete_dependent_param_type, 9228 diag::err_operator_delete_param_type)) 9229 return true; 9230 9231 return false; 9232} 9233 9234/// CheckOverloadedOperatorDeclaration - Check whether the declaration 9235/// of this overloaded operator is well-formed. If so, returns false; 9236/// otherwise, emits appropriate diagnostics and returns true. 9237bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 9238 assert(FnDecl && FnDecl->isOverloadedOperator() && 9239 "Expected an overloaded operator declaration"); 9240 9241 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 9242 9243 // C++ [over.oper]p5: 9244 // The allocation and deallocation functions, operator new, 9245 // operator new[], operator delete and operator delete[], are 9246 // described completely in 3.7.3. The attributes and restrictions 9247 // found in the rest of this subclause do not apply to them unless 9248 // explicitly stated in 3.7.3. 9249 if (Op == OO_Delete || Op == OO_Array_Delete) 9250 return CheckOperatorDeleteDeclaration(*this, FnDecl); 9251 9252 if (Op == OO_New || Op == OO_Array_New) 9253 return CheckOperatorNewDeclaration(*this, FnDecl); 9254 9255 // C++ [over.oper]p6: 9256 // An operator function shall either be a non-static member 9257 // function or be a non-member function and have at least one 9258 // parameter whose type is a class, a reference to a class, an 9259 // enumeration, or a reference to an enumeration. 9260 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 9261 if (MethodDecl->isStatic()) 9262 return Diag(FnDecl->getLocation(), 9263 diag::err_operator_overload_static) << FnDecl->getDeclName(); 9264 } else { 9265 bool ClassOrEnumParam = false; 9266 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 9267 ParamEnd = FnDecl->param_end(); 9268 Param != ParamEnd; ++Param) { 9269 QualType ParamType = (*Param)->getType().getNonReferenceType(); 9270 if (ParamType->isDependentType() || ParamType->isRecordType() || 9271 ParamType->isEnumeralType()) { 9272 ClassOrEnumParam = true; 9273 break; 9274 } 9275 } 9276 9277 if (!ClassOrEnumParam) 9278 return Diag(FnDecl->getLocation(), 9279 diag::err_operator_overload_needs_class_or_enum) 9280 << FnDecl->getDeclName(); 9281 } 9282 9283 // C++ [over.oper]p8: 9284 // An operator function cannot have default arguments (8.3.6), 9285 // except where explicitly stated below. 9286 // 9287 // Only the function-call operator allows default arguments 9288 // (C++ [over.call]p1). 9289 if (Op != OO_Call) { 9290 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 9291 Param != FnDecl->param_end(); ++Param) { 9292 if ((*Param)->hasDefaultArg()) 9293 return Diag((*Param)->getLocation(), 9294 diag::err_operator_overload_default_arg) 9295 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 9296 } 9297 } 9298 9299 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 9300 { false, false, false } 9301#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 9302 , { Unary, Binary, MemberOnly } 9303#include "clang/Basic/OperatorKinds.def" 9304 }; 9305 9306 bool CanBeUnaryOperator = OperatorUses[Op][0]; 9307 bool CanBeBinaryOperator = OperatorUses[Op][1]; 9308 bool MustBeMemberOperator = OperatorUses[Op][2]; 9309 9310 // C++ [over.oper]p8: 9311 // [...] Operator functions cannot have more or fewer parameters 9312 // than the number required for the corresponding operator, as 9313 // described in the rest of this subclause. 9314 unsigned NumParams = FnDecl->getNumParams() 9315 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 9316 if (Op != OO_Call && 9317 ((NumParams == 1 && !CanBeUnaryOperator) || 9318 (NumParams == 2 && !CanBeBinaryOperator) || 9319 (NumParams < 1) || (NumParams > 2))) { 9320 // We have the wrong number of parameters. 9321 unsigned ErrorKind; 9322 if (CanBeUnaryOperator && CanBeBinaryOperator) { 9323 ErrorKind = 2; // 2 -> unary or binary. 9324 } else if (CanBeUnaryOperator) { 9325 ErrorKind = 0; // 0 -> unary 9326 } else { 9327 assert(CanBeBinaryOperator && 9328 "All non-call overloaded operators are unary or binary!"); 9329 ErrorKind = 1; // 1 -> binary 9330 } 9331 9332 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 9333 << FnDecl->getDeclName() << NumParams << ErrorKind; 9334 } 9335 9336 // Overloaded operators other than operator() cannot be variadic. 9337 if (Op != OO_Call && 9338 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 9339 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 9340 << FnDecl->getDeclName(); 9341 } 9342 9343 // Some operators must be non-static member functions. 9344 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 9345 return Diag(FnDecl->getLocation(), 9346 diag::err_operator_overload_must_be_member) 9347 << FnDecl->getDeclName(); 9348 } 9349 9350 // C++ [over.inc]p1: 9351 // The user-defined function called operator++ implements the 9352 // prefix and postfix ++ operator. If this function is a member 9353 // function with no parameters, or a non-member function with one 9354 // parameter of class or enumeration type, it defines the prefix 9355 // increment operator ++ for objects of that type. If the function 9356 // is a member function with one parameter (which shall be of type 9357 // int) or a non-member function with two parameters (the second 9358 // of which shall be of type int), it defines the postfix 9359 // increment operator ++ for objects of that type. 9360 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 9361 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 9362 bool ParamIsInt = false; 9363 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 9364 ParamIsInt = BT->getKind() == BuiltinType::Int; 9365 9366 if (!ParamIsInt) 9367 return Diag(LastParam->getLocation(), 9368 diag::err_operator_overload_post_incdec_must_be_int) 9369 << LastParam->getType() << (Op == OO_MinusMinus); 9370 } 9371 9372 return false; 9373} 9374 9375/// CheckLiteralOperatorDeclaration - Check whether the declaration 9376/// of this literal operator function is well-formed. If so, returns 9377/// false; otherwise, emits appropriate diagnostics and returns true. 9378bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 9379 if (isa<CXXMethodDecl>(FnDecl)) { 9380 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 9381 << FnDecl->getDeclName(); 9382 return true; 9383 } 9384 9385 if (FnDecl->isExternC()) { 9386 Diag(FnDecl->getLocation(), diag::err_literal_operator_extern_c); 9387 return true; 9388 } 9389 9390 bool Valid = false; 9391 9392 // This might be the definition of a literal operator template. 9393 FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate(); 9394 // This might be a specialization of a literal operator template. 9395 if (!TpDecl) 9396 TpDecl = FnDecl->getPrimaryTemplate(); 9397 9398 // template <char...> type operator "" name() is the only valid template 9399 // signature, and the only valid signature with no parameters. 9400 if (TpDecl) { 9401 if (FnDecl->param_size() == 0) { 9402 // Must have only one template parameter 9403 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 9404 if (Params->size() == 1) { 9405 NonTypeTemplateParmDecl *PmDecl = 9406 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 9407 9408 // The template parameter must be a char parameter pack. 9409 if (PmDecl && PmDecl->isTemplateParameterPack() && 9410 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 9411 Valid = true; 9412 } 9413 } 9414 } else if (FnDecl->param_size()) { 9415 // Check the first parameter 9416 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 9417 9418 QualType T = (*Param)->getType().getUnqualifiedType(); 9419 9420 // unsigned long long int, long double, and any character type are allowed 9421 // as the only parameters. 9422 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 9423 Context.hasSameType(T, Context.LongDoubleTy) || 9424 Context.hasSameType(T, Context.CharTy) || 9425 Context.hasSameType(T, Context.WCharTy) || 9426 Context.hasSameType(T, Context.Char16Ty) || 9427 Context.hasSameType(T, Context.Char32Ty)) { 9428 if (++Param == FnDecl->param_end()) 9429 Valid = true; 9430 goto FinishedParams; 9431 } 9432 9433 // Otherwise it must be a pointer to const; let's strip those qualifiers. 9434 const PointerType *PT = T->getAs<PointerType>(); 9435 if (!PT) 9436 goto FinishedParams; 9437 T = PT->getPointeeType(); 9438 if (!T.isConstQualified() || T.isVolatileQualified()) 9439 goto FinishedParams; 9440 T = T.getUnqualifiedType(); 9441 9442 // Move on to the second parameter; 9443 ++Param; 9444 9445 // If there is no second parameter, the first must be a const char * 9446 if (Param == FnDecl->param_end()) { 9447 if (Context.hasSameType(T, Context.CharTy)) 9448 Valid = true; 9449 goto FinishedParams; 9450 } 9451 9452 // const char *, const wchar_t*, const char16_t*, and const char32_t* 9453 // are allowed as the first parameter to a two-parameter function 9454 if (!(Context.hasSameType(T, Context.CharTy) || 9455 Context.hasSameType(T, Context.WCharTy) || 9456 Context.hasSameType(T, Context.Char16Ty) || 9457 Context.hasSameType(T, Context.Char32Ty))) 9458 goto FinishedParams; 9459 9460 // The second and final parameter must be an std::size_t 9461 T = (*Param)->getType().getUnqualifiedType(); 9462 if (Context.hasSameType(T, Context.getSizeType()) && 9463 ++Param == FnDecl->param_end()) 9464 Valid = true; 9465 } 9466 9467 // FIXME: This diagnostic is absolutely terrible. 9468FinishedParams: 9469 if (!Valid) { 9470 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 9471 << FnDecl->getDeclName(); 9472 return true; 9473 } 9474 9475 // A parameter-declaration-clause containing a default argument is not 9476 // equivalent to any of the permitted forms. 9477 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 9478 ParamEnd = FnDecl->param_end(); 9479 Param != ParamEnd; ++Param) { 9480 if ((*Param)->hasDefaultArg()) { 9481 Diag((*Param)->getDefaultArgRange().getBegin(), 9482 diag::err_literal_operator_default_argument) 9483 << (*Param)->getDefaultArgRange(); 9484 break; 9485 } 9486 } 9487 9488 StringRef LiteralName 9489 = FnDecl->getDeclName().getCXXLiteralIdentifier()->getName(); 9490 if (LiteralName[0] != '_') { 9491 // C++11 [usrlit.suffix]p1: 9492 // Literal suffix identifiers that do not start with an underscore 9493 // are reserved for future standardization. 9494 Diag(FnDecl->getLocation(), diag::warn_user_literal_reserved); 9495 } 9496 9497 return false; 9498} 9499 9500/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 9501/// linkage specification, including the language and (if present) 9502/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 9503/// the location of the language string literal, which is provided 9504/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 9505/// the '{' brace. Otherwise, this linkage specification does not 9506/// have any braces. 9507Decl *Sema::ActOnStartLinkageSpecification(Scope *S, SourceLocation ExternLoc, 9508 SourceLocation LangLoc, 9509 StringRef Lang, 9510 SourceLocation LBraceLoc) { 9511 LinkageSpecDecl::LanguageIDs Language; 9512 if (Lang == "\"C\"") 9513 Language = LinkageSpecDecl::lang_c; 9514 else if (Lang == "\"C++\"") 9515 Language = LinkageSpecDecl::lang_cxx; 9516 else { 9517 Diag(LangLoc, diag::err_bad_language); 9518 return 0; 9519 } 9520 9521 // FIXME: Add all the various semantics of linkage specifications 9522 9523 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 9524 ExternLoc, LangLoc, Language); 9525 CurContext->addDecl(D); 9526 PushDeclContext(S, D); 9527 return D; 9528} 9529 9530/// ActOnFinishLinkageSpecification - Complete the definition of 9531/// the C++ linkage specification LinkageSpec. If RBraceLoc is 9532/// valid, it's the position of the closing '}' brace in a linkage 9533/// specification that uses braces. 9534Decl *Sema::ActOnFinishLinkageSpecification(Scope *S, 9535 Decl *LinkageSpec, 9536 SourceLocation RBraceLoc) { 9537 if (LinkageSpec) { 9538 if (RBraceLoc.isValid()) { 9539 LinkageSpecDecl* LSDecl = cast<LinkageSpecDecl>(LinkageSpec); 9540 LSDecl->setRBraceLoc(RBraceLoc); 9541 } 9542 PopDeclContext(); 9543 } 9544 return LinkageSpec; 9545} 9546 9547/// \brief Perform semantic analysis for the variable declaration that 9548/// occurs within a C++ catch clause, returning the newly-created 9549/// variable. 9550VarDecl *Sema::BuildExceptionDeclaration(Scope *S, 9551 TypeSourceInfo *TInfo, 9552 SourceLocation StartLoc, 9553 SourceLocation Loc, 9554 IdentifierInfo *Name) { 9555 bool Invalid = false; 9556 QualType ExDeclType = TInfo->getType(); 9557 9558 // Arrays and functions decay. 9559 if (ExDeclType->isArrayType()) 9560 ExDeclType = Context.getArrayDecayedType(ExDeclType); 9561 else if (ExDeclType->isFunctionType()) 9562 ExDeclType = Context.getPointerType(ExDeclType); 9563 9564 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 9565 // The exception-declaration shall not denote a pointer or reference to an 9566 // incomplete type, other than [cv] void*. 9567 // N2844 forbids rvalue references. 9568 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 9569 Diag(Loc, diag::err_catch_rvalue_ref); 9570 Invalid = true; 9571 } 9572 9573 QualType BaseType = ExDeclType; 9574 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 9575 unsigned DK = diag::err_catch_incomplete; 9576 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 9577 BaseType = Ptr->getPointeeType(); 9578 Mode = 1; 9579 DK = diag::err_catch_incomplete_ptr; 9580 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 9581 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 9582 BaseType = Ref->getPointeeType(); 9583 Mode = 2; 9584 DK = diag::err_catch_incomplete_ref; 9585 } 9586 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 9587 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK)) 9588 Invalid = true; 9589 9590 if (!Invalid && !ExDeclType->isDependentType() && 9591 RequireNonAbstractType(Loc, ExDeclType, 9592 diag::err_abstract_type_in_decl, 9593 AbstractVariableType)) 9594 Invalid = true; 9595 9596 // Only the non-fragile NeXT runtime currently supports C++ catches 9597 // of ObjC types, and no runtime supports catching ObjC types by value. 9598 if (!Invalid && getLangOpts().ObjC1) { 9599 QualType T = ExDeclType; 9600 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 9601 T = RT->getPointeeType(); 9602 9603 if (T->isObjCObjectType()) { 9604 Diag(Loc, diag::err_objc_object_catch); 9605 Invalid = true; 9606 } else if (T->isObjCObjectPointerType()) { 9607 if (!getLangOpts().ObjCNonFragileABI) 9608 Diag(Loc, diag::warn_objc_pointer_cxx_catch_fragile); 9609 } 9610 } 9611 9612 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, StartLoc, Loc, Name, 9613 ExDeclType, TInfo, SC_None, SC_None); 9614 ExDecl->setExceptionVariable(true); 9615 9616 // In ARC, infer 'retaining' for variables of retainable type. 9617 if (getLangOpts().ObjCAutoRefCount && inferObjCARCLifetime(ExDecl)) 9618 Invalid = true; 9619 9620 if (!Invalid && !ExDeclType->isDependentType()) { 9621 if (const RecordType *recordType = ExDeclType->getAs<RecordType>()) { 9622 // C++ [except.handle]p16: 9623 // The object declared in an exception-declaration or, if the 9624 // exception-declaration does not specify a name, a temporary (12.2) is 9625 // copy-initialized (8.5) from the exception object. [...] 9626 // The object is destroyed when the handler exits, after the destruction 9627 // of any automatic objects initialized within the handler. 9628 // 9629 // We just pretend to initialize the object with itself, then make sure 9630 // it can be destroyed later. 9631 QualType initType = ExDeclType; 9632 9633 InitializedEntity entity = 9634 InitializedEntity::InitializeVariable(ExDecl); 9635 InitializationKind initKind = 9636 InitializationKind::CreateCopy(Loc, SourceLocation()); 9637 9638 Expr *opaqueValue = 9639 new (Context) OpaqueValueExpr(Loc, initType, VK_LValue, OK_Ordinary); 9640 InitializationSequence sequence(*this, entity, initKind, &opaqueValue, 1); 9641 ExprResult result = sequence.Perform(*this, entity, initKind, 9642 MultiExprArg(&opaqueValue, 1)); 9643 if (result.isInvalid()) 9644 Invalid = true; 9645 else { 9646 // If the constructor used was non-trivial, set this as the 9647 // "initializer". 9648 CXXConstructExpr *construct = cast<CXXConstructExpr>(result.take()); 9649 if (!construct->getConstructor()->isTrivial()) { 9650 Expr *init = MaybeCreateExprWithCleanups(construct); 9651 ExDecl->setInit(init); 9652 } 9653 9654 // And make sure it's destructable. 9655 FinalizeVarWithDestructor(ExDecl, recordType); 9656 } 9657 } 9658 } 9659 9660 if (Invalid) 9661 ExDecl->setInvalidDecl(); 9662 9663 return ExDecl; 9664} 9665 9666/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 9667/// handler. 9668Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 9669 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 9670 bool Invalid = D.isInvalidType(); 9671 9672 // Check for unexpanded parameter packs. 9673 if (TInfo && DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 9674 UPPC_ExceptionType)) { 9675 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 9676 D.getIdentifierLoc()); 9677 Invalid = true; 9678 } 9679 9680 IdentifierInfo *II = D.getIdentifier(); 9681 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 9682 LookupOrdinaryName, 9683 ForRedeclaration)) { 9684 // The scope should be freshly made just for us. There is just no way 9685 // it contains any previous declaration. 9686 assert(!S->isDeclScope(PrevDecl)); 9687 if (PrevDecl->isTemplateParameter()) { 9688 // Maybe we will complain about the shadowed template parameter. 9689 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 9690 PrevDecl = 0; 9691 } 9692 } 9693 9694 if (D.getCXXScopeSpec().isSet() && !Invalid) { 9695 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 9696 << D.getCXXScopeSpec().getRange(); 9697 Invalid = true; 9698 } 9699 9700 VarDecl *ExDecl = BuildExceptionDeclaration(S, TInfo, 9701 D.getLocStart(), 9702 D.getIdentifierLoc(), 9703 D.getIdentifier()); 9704 if (Invalid) 9705 ExDecl->setInvalidDecl(); 9706 9707 // Add the exception declaration into this scope. 9708 if (II) 9709 PushOnScopeChains(ExDecl, S); 9710 else 9711 CurContext->addDecl(ExDecl); 9712 9713 ProcessDeclAttributes(S, ExDecl, D); 9714 return ExDecl; 9715} 9716 9717Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation StaticAssertLoc, 9718 Expr *AssertExpr, 9719 Expr *AssertMessageExpr_, 9720 SourceLocation RParenLoc) { 9721 StringLiteral *AssertMessage = cast<StringLiteral>(AssertMessageExpr_); 9722 9723 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 9724 // In a static_assert-declaration, the constant-expression shall be a 9725 // constant expression that can be contextually converted to bool. 9726 ExprResult Converted = PerformContextuallyConvertToBool(AssertExpr); 9727 if (Converted.isInvalid()) 9728 return 0; 9729 9730 llvm::APSInt Cond; 9731 if (VerifyIntegerConstantExpression(Converted.get(), &Cond, 9732 diag::err_static_assert_expression_is_not_constant, 9733 /*AllowFold=*/false).isInvalid()) 9734 return 0; 9735 9736 if (!Cond) { 9737 llvm::SmallString<256> MsgBuffer; 9738 llvm::raw_svector_ostream Msg(MsgBuffer); 9739 AssertMessage->printPretty(Msg, Context, 0, getPrintingPolicy()); 9740 Diag(StaticAssertLoc, diag::err_static_assert_failed) 9741 << Msg.str() << AssertExpr->getSourceRange(); 9742 } 9743 } 9744 9745 if (DiagnoseUnexpandedParameterPack(AssertExpr, UPPC_StaticAssertExpression)) 9746 return 0; 9747 9748 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, StaticAssertLoc, 9749 AssertExpr, AssertMessage, RParenLoc); 9750 9751 CurContext->addDecl(Decl); 9752 return Decl; 9753} 9754 9755/// \brief Perform semantic analysis of the given friend type declaration. 9756/// 9757/// \returns A friend declaration that. 9758FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation Loc, 9759 SourceLocation FriendLoc, 9760 TypeSourceInfo *TSInfo) { 9761 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 9762 9763 QualType T = TSInfo->getType(); 9764 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 9765 9766 // C++03 [class.friend]p2: 9767 // An elaborated-type-specifier shall be used in a friend declaration 9768 // for a class.* 9769 // 9770 // * The class-key of the elaborated-type-specifier is required. 9771 if (!ActiveTemplateInstantiations.empty()) { 9772 // Do not complain about the form of friend template types during 9773 // template instantiation; we will already have complained when the 9774 // template was declared. 9775 } else if (!T->isElaboratedTypeSpecifier()) { 9776 // If we evaluated the type to a record type, suggest putting 9777 // a tag in front. 9778 if (const RecordType *RT = T->getAs<RecordType>()) { 9779 RecordDecl *RD = RT->getDecl(); 9780 9781 std::string InsertionText = std::string(" ") + RD->getKindName(); 9782 9783 Diag(TypeRange.getBegin(), 9784 getLangOpts().CPlusPlus0x ? 9785 diag::warn_cxx98_compat_unelaborated_friend_type : 9786 diag::ext_unelaborated_friend_type) 9787 << (unsigned) RD->getTagKind() 9788 << T 9789 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 9790 InsertionText); 9791 } else { 9792 Diag(FriendLoc, 9793 getLangOpts().CPlusPlus0x ? 9794 diag::warn_cxx98_compat_nonclass_type_friend : 9795 diag::ext_nonclass_type_friend) 9796 << T 9797 << SourceRange(FriendLoc, TypeRange.getEnd()); 9798 } 9799 } else if (T->getAs<EnumType>()) { 9800 Diag(FriendLoc, 9801 getLangOpts().CPlusPlus0x ? 9802 diag::warn_cxx98_compat_enum_friend : 9803 diag::ext_enum_friend) 9804 << T 9805 << SourceRange(FriendLoc, TypeRange.getEnd()); 9806 } 9807 9808 // C++0x [class.friend]p3: 9809 // If the type specifier in a friend declaration designates a (possibly 9810 // cv-qualified) class type, that class is declared as a friend; otherwise, 9811 // the friend declaration is ignored. 9812 9813 // FIXME: C++0x has some syntactic restrictions on friend type declarations 9814 // in [class.friend]p3 that we do not implement. 9815 9816 return FriendDecl::Create(Context, CurContext, Loc, TSInfo, FriendLoc); 9817} 9818 9819/// Handle a friend tag declaration where the scope specifier was 9820/// templated. 9821Decl *Sema::ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc, 9822 unsigned TagSpec, SourceLocation TagLoc, 9823 CXXScopeSpec &SS, 9824 IdentifierInfo *Name, SourceLocation NameLoc, 9825 AttributeList *Attr, 9826 MultiTemplateParamsArg TempParamLists) { 9827 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 9828 9829 bool isExplicitSpecialization = false; 9830 bool Invalid = false; 9831 9832 if (TemplateParameterList *TemplateParams 9833 = MatchTemplateParametersToScopeSpecifier(TagLoc, NameLoc, SS, 9834 TempParamLists.get(), 9835 TempParamLists.size(), 9836 /*friend*/ true, 9837 isExplicitSpecialization, 9838 Invalid)) { 9839 if (TemplateParams->size() > 0) { 9840 // This is a declaration of a class template. 9841 if (Invalid) 9842 return 0; 9843 9844 return CheckClassTemplate(S, TagSpec, TUK_Friend, TagLoc, 9845 SS, Name, NameLoc, Attr, 9846 TemplateParams, AS_public, 9847 /*ModulePrivateLoc=*/SourceLocation(), 9848 TempParamLists.size() - 1, 9849 (TemplateParameterList**) TempParamLists.release()).take(); 9850 } else { 9851 // The "template<>" header is extraneous. 9852 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 9853 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 9854 isExplicitSpecialization = true; 9855 } 9856 } 9857 9858 if (Invalid) return 0; 9859 9860 bool isAllExplicitSpecializations = true; 9861 for (unsigned I = TempParamLists.size(); I-- > 0; ) { 9862 if (TempParamLists.get()[I]->size()) { 9863 isAllExplicitSpecializations = false; 9864 break; 9865 } 9866 } 9867 9868 // FIXME: don't ignore attributes. 9869 9870 // If it's explicit specializations all the way down, just forget 9871 // about the template header and build an appropriate non-templated 9872 // friend. TODO: for source fidelity, remember the headers. 9873 if (isAllExplicitSpecializations) { 9874 if (SS.isEmpty()) { 9875 bool Owned = false; 9876 bool IsDependent = false; 9877 return ActOnTag(S, TagSpec, TUK_Friend, TagLoc, SS, Name, NameLoc, 9878 Attr, AS_public, 9879 /*ModulePrivateLoc=*/SourceLocation(), 9880 MultiTemplateParamsArg(), Owned, IsDependent, 9881 /*ScopedEnumKWLoc=*/SourceLocation(), 9882 /*ScopedEnumUsesClassTag=*/false, 9883 /*UnderlyingType=*/TypeResult()); 9884 } 9885 9886 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 9887 ElaboratedTypeKeyword Keyword 9888 = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 9889 QualType T = CheckTypenameType(Keyword, TagLoc, QualifierLoc, 9890 *Name, NameLoc); 9891 if (T.isNull()) 9892 return 0; 9893 9894 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 9895 if (isa<DependentNameType>(T)) { 9896 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 9897 TL.setElaboratedKeywordLoc(TagLoc); 9898 TL.setQualifierLoc(QualifierLoc); 9899 TL.setNameLoc(NameLoc); 9900 } else { 9901 ElaboratedTypeLoc TL = cast<ElaboratedTypeLoc>(TSI->getTypeLoc()); 9902 TL.setElaboratedKeywordLoc(TagLoc); 9903 TL.setQualifierLoc(QualifierLoc); 9904 cast<TypeSpecTypeLoc>(TL.getNamedTypeLoc()).setNameLoc(NameLoc); 9905 } 9906 9907 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 9908 TSI, FriendLoc); 9909 Friend->setAccess(AS_public); 9910 CurContext->addDecl(Friend); 9911 return Friend; 9912 } 9913 9914 assert(SS.isNotEmpty() && "valid templated tag with no SS and no direct?"); 9915 9916 9917 9918 // Handle the case of a templated-scope friend class. e.g. 9919 // template <class T> class A<T>::B; 9920 // FIXME: we don't support these right now. 9921 ElaboratedTypeKeyword ETK = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 9922 QualType T = Context.getDependentNameType(ETK, SS.getScopeRep(), Name); 9923 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 9924 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 9925 TL.setElaboratedKeywordLoc(TagLoc); 9926 TL.setQualifierLoc(SS.getWithLocInContext(Context)); 9927 TL.setNameLoc(NameLoc); 9928 9929 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 9930 TSI, FriendLoc); 9931 Friend->setAccess(AS_public); 9932 Friend->setUnsupportedFriend(true); 9933 CurContext->addDecl(Friend); 9934 return Friend; 9935} 9936 9937 9938/// Handle a friend type declaration. This works in tandem with 9939/// ActOnTag. 9940/// 9941/// Notes on friend class templates: 9942/// 9943/// We generally treat friend class declarations as if they were 9944/// declaring a class. So, for example, the elaborated type specifier 9945/// in a friend declaration is required to obey the restrictions of a 9946/// class-head (i.e. no typedefs in the scope chain), template 9947/// parameters are required to match up with simple template-ids, &c. 9948/// However, unlike when declaring a template specialization, it's 9949/// okay to refer to a template specialization without an empty 9950/// template parameter declaration, e.g. 9951/// friend class A<T>::B<unsigned>; 9952/// We permit this as a special case; if there are any template 9953/// parameters present at all, require proper matching, i.e. 9954/// template <> template <class T> friend class A<int>::B; 9955Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 9956 MultiTemplateParamsArg TempParams) { 9957 SourceLocation Loc = DS.getLocStart(); 9958 9959 assert(DS.isFriendSpecified()); 9960 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 9961 9962 // Try to convert the decl specifier to a type. This works for 9963 // friend templates because ActOnTag never produces a ClassTemplateDecl 9964 // for a TUK_Friend. 9965 Declarator TheDeclarator(DS, Declarator::MemberContext); 9966 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 9967 QualType T = TSI->getType(); 9968 if (TheDeclarator.isInvalidType()) 9969 return 0; 9970 9971 if (DiagnoseUnexpandedParameterPack(Loc, TSI, UPPC_FriendDeclaration)) 9972 return 0; 9973 9974 // This is definitely an error in C++98. It's probably meant to 9975 // be forbidden in C++0x, too, but the specification is just 9976 // poorly written. 9977 // 9978 // The problem is with declarations like the following: 9979 // template <T> friend A<T>::foo; 9980 // where deciding whether a class C is a friend or not now hinges 9981 // on whether there exists an instantiation of A that causes 9982 // 'foo' to equal C. There are restrictions on class-heads 9983 // (which we declare (by fiat) elaborated friend declarations to 9984 // be) that makes this tractable. 9985 // 9986 // FIXME: handle "template <> friend class A<T>;", which 9987 // is possibly well-formed? Who even knows? 9988 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 9989 Diag(Loc, diag::err_tagless_friend_type_template) 9990 << DS.getSourceRange(); 9991 return 0; 9992 } 9993 9994 // C++98 [class.friend]p1: A friend of a class is a function 9995 // or class that is not a member of the class . . . 9996 // This is fixed in DR77, which just barely didn't make the C++03 9997 // deadline. It's also a very silly restriction that seriously 9998 // affects inner classes and which nobody else seems to implement; 9999 // thus we never diagnose it, not even in -pedantic. 10000 // 10001 // But note that we could warn about it: it's always useless to 10002 // friend one of your own members (it's not, however, worthless to 10003 // friend a member of an arbitrary specialization of your template). 10004 10005 Decl *D; 10006 if (unsigned NumTempParamLists = TempParams.size()) 10007 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 10008 NumTempParamLists, 10009 TempParams.release(), 10010 TSI, 10011 DS.getFriendSpecLoc()); 10012 else 10013 D = CheckFriendTypeDecl(Loc, DS.getFriendSpecLoc(), TSI); 10014 10015 if (!D) 10016 return 0; 10017 10018 D->setAccess(AS_public); 10019 CurContext->addDecl(D); 10020 10021 return D; 10022} 10023 10024Decl *Sema::ActOnFriendFunctionDecl(Scope *S, Declarator &D, 10025 MultiTemplateParamsArg TemplateParams) { 10026 const DeclSpec &DS = D.getDeclSpec(); 10027 10028 assert(DS.isFriendSpecified()); 10029 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 10030 10031 SourceLocation Loc = D.getIdentifierLoc(); 10032 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 10033 10034 // C++ [class.friend]p1 10035 // A friend of a class is a function or class.... 10036 // Note that this sees through typedefs, which is intended. 10037 // It *doesn't* see through dependent types, which is correct 10038 // according to [temp.arg.type]p3: 10039 // If a declaration acquires a function type through a 10040 // type dependent on a template-parameter and this causes 10041 // a declaration that does not use the syntactic form of a 10042 // function declarator to have a function type, the program 10043 // is ill-formed. 10044 if (!TInfo->getType()->isFunctionType()) { 10045 Diag(Loc, diag::err_unexpected_friend); 10046 10047 // It might be worthwhile to try to recover by creating an 10048 // appropriate declaration. 10049 return 0; 10050 } 10051 10052 // C++ [namespace.memdef]p3 10053 // - If a friend declaration in a non-local class first declares a 10054 // class or function, the friend class or function is a member 10055 // of the innermost enclosing namespace. 10056 // - The name of the friend is not found by simple name lookup 10057 // until a matching declaration is provided in that namespace 10058 // scope (either before or after the class declaration granting 10059 // friendship). 10060 // - If a friend function is called, its name may be found by the 10061 // name lookup that considers functions from namespaces and 10062 // classes associated with the types of the function arguments. 10063 // - When looking for a prior declaration of a class or a function 10064 // declared as a friend, scopes outside the innermost enclosing 10065 // namespace scope are not considered. 10066 10067 CXXScopeSpec &SS = D.getCXXScopeSpec(); 10068 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 10069 DeclarationName Name = NameInfo.getName(); 10070 assert(Name); 10071 10072 // Check for unexpanded parameter packs. 10073 if (DiagnoseUnexpandedParameterPack(Loc, TInfo, UPPC_FriendDeclaration) || 10074 DiagnoseUnexpandedParameterPack(NameInfo, UPPC_FriendDeclaration) || 10075 DiagnoseUnexpandedParameterPack(SS, UPPC_FriendDeclaration)) 10076 return 0; 10077 10078 // The context we found the declaration in, or in which we should 10079 // create the declaration. 10080 DeclContext *DC; 10081 Scope *DCScope = S; 10082 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 10083 ForRedeclaration); 10084 10085 // FIXME: there are different rules in local classes 10086 10087 // There are four cases here. 10088 // - There's no scope specifier, in which case we just go to the 10089 // appropriate scope and look for a function or function template 10090 // there as appropriate. 10091 // Recover from invalid scope qualifiers as if they just weren't there. 10092 if (SS.isInvalid() || !SS.isSet()) { 10093 // C++0x [namespace.memdef]p3: 10094 // If the name in a friend declaration is neither qualified nor 10095 // a template-id and the declaration is a function or an 10096 // elaborated-type-specifier, the lookup to determine whether 10097 // the entity has been previously declared shall not consider 10098 // any scopes outside the innermost enclosing namespace. 10099 // C++0x [class.friend]p11: 10100 // If a friend declaration appears in a local class and the name 10101 // specified is an unqualified name, a prior declaration is 10102 // looked up without considering scopes that are outside the 10103 // innermost enclosing non-class scope. For a friend function 10104 // declaration, if there is no prior declaration, the program is 10105 // ill-formed. 10106 bool isLocal = cast<CXXRecordDecl>(CurContext)->isLocalClass(); 10107 bool isTemplateId = D.getName().getKind() == UnqualifiedId::IK_TemplateId; 10108 10109 // Find the appropriate context according to the above. 10110 DC = CurContext; 10111 while (true) { 10112 // Skip class contexts. If someone can cite chapter and verse 10113 // for this behavior, that would be nice --- it's what GCC and 10114 // EDG do, and it seems like a reasonable intent, but the spec 10115 // really only says that checks for unqualified existing 10116 // declarations should stop at the nearest enclosing namespace, 10117 // not that they should only consider the nearest enclosing 10118 // namespace. 10119 while (DC->isRecord() || DC->isTransparentContext()) 10120 DC = DC->getParent(); 10121 10122 LookupQualifiedName(Previous, DC); 10123 10124 // TODO: decide what we think about using declarations. 10125 if (isLocal || !Previous.empty()) 10126 break; 10127 10128 if (isTemplateId) { 10129 if (isa<TranslationUnitDecl>(DC)) break; 10130 } else { 10131 if (DC->isFileContext()) break; 10132 } 10133 DC = DC->getParent(); 10134 } 10135 10136 // C++ [class.friend]p1: A friend of a class is a function or 10137 // class that is not a member of the class . . . 10138 // C++11 changes this for both friend types and functions. 10139 // Most C++ 98 compilers do seem to give an error here, so 10140 // we do, too. 10141 if (!Previous.empty() && DC->Equals(CurContext)) 10142 Diag(DS.getFriendSpecLoc(), 10143 getLangOpts().CPlusPlus0x ? 10144 diag::warn_cxx98_compat_friend_is_member : 10145 diag::err_friend_is_member); 10146 10147 DCScope = getScopeForDeclContext(S, DC); 10148 10149 // C++ [class.friend]p6: 10150 // A function can be defined in a friend declaration of a class if and 10151 // only if the class is a non-local class (9.8), the function name is 10152 // unqualified, and the function has namespace scope. 10153 if (isLocal && D.isFunctionDefinition()) { 10154 Diag(NameInfo.getBeginLoc(), diag::err_friend_def_in_local_class); 10155 } 10156 10157 // - There's a non-dependent scope specifier, in which case we 10158 // compute it and do a previous lookup there for a function 10159 // or function template. 10160 } else if (!SS.getScopeRep()->isDependent()) { 10161 DC = computeDeclContext(SS); 10162 if (!DC) return 0; 10163 10164 if (RequireCompleteDeclContext(SS, DC)) return 0; 10165 10166 LookupQualifiedName(Previous, DC); 10167 10168 // Ignore things found implicitly in the wrong scope. 10169 // TODO: better diagnostics for this case. Suggesting the right 10170 // qualified scope would be nice... 10171 LookupResult::Filter F = Previous.makeFilter(); 10172 while (F.hasNext()) { 10173 NamedDecl *D = F.next(); 10174 if (!DC->InEnclosingNamespaceSetOf( 10175 D->getDeclContext()->getRedeclContext())) 10176 F.erase(); 10177 } 10178 F.done(); 10179 10180 if (Previous.empty()) { 10181 D.setInvalidType(); 10182 Diag(Loc, diag::err_qualified_friend_not_found) 10183 << Name << TInfo->getType(); 10184 return 0; 10185 } 10186 10187 // C++ [class.friend]p1: A friend of a class is a function or 10188 // class that is not a member of the class . . . 10189 if (DC->Equals(CurContext)) 10190 Diag(DS.getFriendSpecLoc(), 10191 getLangOpts().CPlusPlus0x ? 10192 diag::warn_cxx98_compat_friend_is_member : 10193 diag::err_friend_is_member); 10194 10195 if (D.isFunctionDefinition()) { 10196 // C++ [class.friend]p6: 10197 // A function can be defined in a friend declaration of a class if and 10198 // only if the class is a non-local class (9.8), the function name is 10199 // unqualified, and the function has namespace scope. 10200 SemaDiagnosticBuilder DB 10201 = Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def); 10202 10203 DB << SS.getScopeRep(); 10204 if (DC->isFileContext()) 10205 DB << FixItHint::CreateRemoval(SS.getRange()); 10206 SS.clear(); 10207 } 10208 10209 // - There's a scope specifier that does not match any template 10210 // parameter lists, in which case we use some arbitrary context, 10211 // create a method or method template, and wait for instantiation. 10212 // - There's a scope specifier that does match some template 10213 // parameter lists, which we don't handle right now. 10214 } else { 10215 if (D.isFunctionDefinition()) { 10216 // C++ [class.friend]p6: 10217 // A function can be defined in a friend declaration of a class if and 10218 // only if the class is a non-local class (9.8), the function name is 10219 // unqualified, and the function has namespace scope. 10220 Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def) 10221 << SS.getScopeRep(); 10222 } 10223 10224 DC = CurContext; 10225 assert(isa<CXXRecordDecl>(DC) && "friend declaration not in class?"); 10226 } 10227 10228 if (!DC->isRecord()) { 10229 // This implies that it has to be an operator or function. 10230 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 10231 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 10232 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 10233 Diag(Loc, diag::err_introducing_special_friend) << 10234 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 10235 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 10236 return 0; 10237 } 10238 } 10239 10240 // FIXME: This is an egregious hack to cope with cases where the scope stack 10241 // does not contain the declaration context, i.e., in an out-of-line 10242 // definition of a class. 10243 Scope FakeDCScope(S, Scope::DeclScope, Diags); 10244 if (!DCScope) { 10245 FakeDCScope.setEntity(DC); 10246 DCScope = &FakeDCScope; 10247 } 10248 10249 bool AddToScope = true; 10250 NamedDecl *ND = ActOnFunctionDeclarator(DCScope, D, DC, TInfo, Previous, 10251 move(TemplateParams), AddToScope); 10252 if (!ND) return 0; 10253 10254 assert(ND->getDeclContext() == DC); 10255 assert(ND->getLexicalDeclContext() == CurContext); 10256 10257 // Add the function declaration to the appropriate lookup tables, 10258 // adjusting the redeclarations list as necessary. We don't 10259 // want to do this yet if the friending class is dependent. 10260 // 10261 // Also update the scope-based lookup if the target context's 10262 // lookup context is in lexical scope. 10263 if (!CurContext->isDependentContext()) { 10264 DC = DC->getRedeclContext(); 10265 DC->makeDeclVisibleInContext(ND); 10266 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 10267 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 10268 } 10269 10270 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 10271 D.getIdentifierLoc(), ND, 10272 DS.getFriendSpecLoc()); 10273 FrD->setAccess(AS_public); 10274 CurContext->addDecl(FrD); 10275 10276 if (ND->isInvalidDecl()) 10277 FrD->setInvalidDecl(); 10278 else { 10279 FunctionDecl *FD; 10280 if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(ND)) 10281 FD = FTD->getTemplatedDecl(); 10282 else 10283 FD = cast<FunctionDecl>(ND); 10284 10285 // Mark templated-scope function declarations as unsupported. 10286 if (FD->getNumTemplateParameterLists()) 10287 FrD->setUnsupportedFriend(true); 10288 } 10289 10290 return ND; 10291} 10292 10293void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) { 10294 AdjustDeclIfTemplate(Dcl); 10295 10296 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 10297 if (!Fn) { 10298 Diag(DelLoc, diag::err_deleted_non_function); 10299 return; 10300 } 10301 if (const FunctionDecl *Prev = Fn->getPreviousDecl()) { 10302 Diag(DelLoc, diag::err_deleted_decl_not_first); 10303 Diag(Prev->getLocation(), diag::note_previous_declaration); 10304 // If the declaration wasn't the first, we delete the function anyway for 10305 // recovery. 10306 } 10307 Fn->setDeletedAsWritten(); 10308 10309 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Dcl); 10310 if (!MD) 10311 return; 10312 10313 // A deleted special member function is trivial if the corresponding 10314 // implicitly-declared function would have been. 10315 switch (getSpecialMember(MD)) { 10316 case CXXInvalid: 10317 break; 10318 case CXXDefaultConstructor: 10319 MD->setTrivial(MD->getParent()->hasTrivialDefaultConstructor()); 10320 break; 10321 case CXXCopyConstructor: 10322 MD->setTrivial(MD->getParent()->hasTrivialCopyConstructor()); 10323 break; 10324 case CXXMoveConstructor: 10325 MD->setTrivial(MD->getParent()->hasTrivialMoveConstructor()); 10326 break; 10327 case CXXCopyAssignment: 10328 MD->setTrivial(MD->getParent()->hasTrivialCopyAssignment()); 10329 break; 10330 case CXXMoveAssignment: 10331 MD->setTrivial(MD->getParent()->hasTrivialMoveAssignment()); 10332 break; 10333 case CXXDestructor: 10334 MD->setTrivial(MD->getParent()->hasTrivialDestructor()); 10335 break; 10336 } 10337} 10338 10339void Sema::SetDeclDefaulted(Decl *Dcl, SourceLocation DefaultLoc) { 10340 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Dcl); 10341 10342 if (MD) { 10343 if (MD->getParent()->isDependentType()) { 10344 MD->setDefaulted(); 10345 MD->setExplicitlyDefaulted(); 10346 return; 10347 } 10348 10349 CXXSpecialMember Member = getSpecialMember(MD); 10350 if (Member == CXXInvalid) { 10351 Diag(DefaultLoc, diag::err_default_special_members); 10352 return; 10353 } 10354 10355 MD->setDefaulted(); 10356 MD->setExplicitlyDefaulted(); 10357 10358 // If this definition appears within the record, do the checking when 10359 // the record is complete. 10360 const FunctionDecl *Primary = MD; 10361 if (MD->getTemplatedKind() != FunctionDecl::TK_NonTemplate) 10362 // Find the uninstantiated declaration that actually had the '= default' 10363 // on it. 10364 MD->getTemplateInstantiationPattern()->isDefined(Primary); 10365 10366 if (Primary == Primary->getCanonicalDecl()) 10367 return; 10368 10369 switch (Member) { 10370 case CXXDefaultConstructor: { 10371 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10372 CheckExplicitlyDefaultedSpecialMember(CD); 10373 if (!CD->isInvalidDecl()) 10374 DefineImplicitDefaultConstructor(DefaultLoc, CD); 10375 break; 10376 } 10377 10378 case CXXCopyConstructor: { 10379 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10380 CheckExplicitlyDefaultedSpecialMember(CD); 10381 if (!CD->isInvalidDecl()) 10382 DefineImplicitCopyConstructor(DefaultLoc, CD); 10383 break; 10384 } 10385 10386 case CXXCopyAssignment: { 10387 CheckExplicitlyDefaultedSpecialMember(MD); 10388 if (!MD->isInvalidDecl()) 10389 DefineImplicitCopyAssignment(DefaultLoc, MD); 10390 break; 10391 } 10392 10393 case CXXDestructor: { 10394 CXXDestructorDecl *DD = cast<CXXDestructorDecl>(MD); 10395 CheckExplicitlyDefaultedSpecialMember(DD); 10396 if (!DD->isInvalidDecl()) 10397 DefineImplicitDestructor(DefaultLoc, DD); 10398 break; 10399 } 10400 10401 case CXXMoveConstructor: { 10402 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10403 CheckExplicitlyDefaultedSpecialMember(CD); 10404 if (!CD->isInvalidDecl()) 10405 DefineImplicitMoveConstructor(DefaultLoc, CD); 10406 break; 10407 } 10408 10409 case CXXMoveAssignment: { 10410 CheckExplicitlyDefaultedSpecialMember(MD); 10411 if (!MD->isInvalidDecl()) 10412 DefineImplicitMoveAssignment(DefaultLoc, MD); 10413 break; 10414 } 10415 10416 case CXXInvalid: 10417 llvm_unreachable("Invalid special member."); 10418 } 10419 } else { 10420 Diag(DefaultLoc, diag::err_default_special_members); 10421 } 10422} 10423 10424static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 10425 for (Stmt::child_range CI = S->children(); CI; ++CI) { 10426 Stmt *SubStmt = *CI; 10427 if (!SubStmt) 10428 continue; 10429 if (isa<ReturnStmt>(SubStmt)) 10430 Self.Diag(SubStmt->getLocStart(), 10431 diag::err_return_in_constructor_handler); 10432 if (!isa<Expr>(SubStmt)) 10433 SearchForReturnInStmt(Self, SubStmt); 10434 } 10435} 10436 10437void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 10438 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 10439 CXXCatchStmt *Handler = TryBlock->getHandler(I); 10440 SearchForReturnInStmt(*this, Handler); 10441 } 10442} 10443 10444bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 10445 const CXXMethodDecl *Old) { 10446 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 10447 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 10448 10449 if (Context.hasSameType(NewTy, OldTy) || 10450 NewTy->isDependentType() || OldTy->isDependentType()) 10451 return false; 10452 10453 // Check if the return types are covariant 10454 QualType NewClassTy, OldClassTy; 10455 10456 /// Both types must be pointers or references to classes. 10457 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 10458 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 10459 NewClassTy = NewPT->getPointeeType(); 10460 OldClassTy = OldPT->getPointeeType(); 10461 } 10462 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 10463 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 10464 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 10465 NewClassTy = NewRT->getPointeeType(); 10466 OldClassTy = OldRT->getPointeeType(); 10467 } 10468 } 10469 } 10470 10471 // The return types aren't either both pointers or references to a class type. 10472 if (NewClassTy.isNull()) { 10473 Diag(New->getLocation(), 10474 diag::err_different_return_type_for_overriding_virtual_function) 10475 << New->getDeclName() << NewTy << OldTy; 10476 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10477 10478 return true; 10479 } 10480 10481 // C++ [class.virtual]p6: 10482 // If the return type of D::f differs from the return type of B::f, the 10483 // class type in the return type of D::f shall be complete at the point of 10484 // declaration of D::f or shall be the class type D. 10485 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 10486 if (!RT->isBeingDefined() && 10487 RequireCompleteType(New->getLocation(), NewClassTy, 10488 diag::err_covariant_return_incomplete, 10489 New->getDeclName())) 10490 return true; 10491 } 10492 10493 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 10494 // Check if the new class derives from the old class. 10495 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 10496 Diag(New->getLocation(), 10497 diag::err_covariant_return_not_derived) 10498 << New->getDeclName() << NewTy << OldTy; 10499 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10500 return true; 10501 } 10502 10503 // Check if we the conversion from derived to base is valid. 10504 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 10505 diag::err_covariant_return_inaccessible_base, 10506 diag::err_covariant_return_ambiguous_derived_to_base_conv, 10507 // FIXME: Should this point to the return type? 10508 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 10509 // FIXME: this note won't trigger for delayed access control 10510 // diagnostics, and it's impossible to get an undelayed error 10511 // here from access control during the original parse because 10512 // the ParsingDeclSpec/ParsingDeclarator are still in scope. 10513 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10514 return true; 10515 } 10516 } 10517 10518 // The qualifiers of the return types must be the same. 10519 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 10520 Diag(New->getLocation(), 10521 diag::err_covariant_return_type_different_qualifications) 10522 << New->getDeclName() << NewTy << OldTy; 10523 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10524 return true; 10525 }; 10526 10527 10528 // The new class type must have the same or less qualifiers as the old type. 10529 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 10530 Diag(New->getLocation(), 10531 diag::err_covariant_return_type_class_type_more_qualified) 10532 << New->getDeclName() << NewTy << OldTy; 10533 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10534 return true; 10535 }; 10536 10537 return false; 10538} 10539 10540/// \brief Mark the given method pure. 10541/// 10542/// \param Method the method to be marked pure. 10543/// 10544/// \param InitRange the source range that covers the "0" initializer. 10545bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 10546 SourceLocation EndLoc = InitRange.getEnd(); 10547 if (EndLoc.isValid()) 10548 Method->setRangeEnd(EndLoc); 10549 10550 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 10551 Method->setPure(); 10552 return false; 10553 } 10554 10555 if (!Method->isInvalidDecl()) 10556 Diag(Method->getLocation(), diag::err_non_virtual_pure) 10557 << Method->getDeclName() << InitRange; 10558 return true; 10559} 10560 10561/// \brief Determine whether the given declaration is a static data member. 10562static bool isStaticDataMember(Decl *D) { 10563 VarDecl *Var = dyn_cast_or_null<VarDecl>(D); 10564 if (!Var) 10565 return false; 10566 10567 return Var->isStaticDataMember(); 10568} 10569/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 10570/// an initializer for the out-of-line declaration 'Dcl'. The scope 10571/// is a fresh scope pushed for just this purpose. 10572/// 10573/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 10574/// static data member of class X, names should be looked up in the scope of 10575/// class X. 10576void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) { 10577 // If there is no declaration, there was an error parsing it. 10578 if (D == 0 || D->isInvalidDecl()) return; 10579 10580 // We should only get called for declarations with scope specifiers, like: 10581 // int foo::bar; 10582 assert(D->isOutOfLine()); 10583 EnterDeclaratorContext(S, D->getDeclContext()); 10584 10585 // If we are parsing the initializer for a static data member, push a 10586 // new expression evaluation context that is associated with this static 10587 // data member. 10588 if (isStaticDataMember(D)) 10589 PushExpressionEvaluationContext(PotentiallyEvaluated, D); 10590} 10591 10592/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 10593/// initializer for the out-of-line declaration 'D'. 10594void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) { 10595 // If there is no declaration, there was an error parsing it. 10596 if (D == 0 || D->isInvalidDecl()) return; 10597 10598 if (isStaticDataMember(D)) 10599 PopExpressionEvaluationContext(); 10600 10601 assert(D->isOutOfLine()); 10602 ExitDeclaratorContext(S); 10603} 10604 10605/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 10606/// C++ if/switch/while/for statement. 10607/// e.g: "if (int x = f()) {...}" 10608DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 10609 // C++ 6.4p2: 10610 // The declarator shall not specify a function or an array. 10611 // The type-specifier-seq shall not contain typedef and shall not declare a 10612 // new class or enumeration. 10613 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 10614 "Parser allowed 'typedef' as storage class of condition decl."); 10615 10616 Decl *Dcl = ActOnDeclarator(S, D); 10617 if (!Dcl) 10618 return true; 10619 10620 if (isa<FunctionDecl>(Dcl)) { // The declarator shall not specify a function. 10621 Diag(Dcl->getLocation(), diag::err_invalid_use_of_function_type) 10622 << D.getSourceRange(); 10623 return true; 10624 } 10625 10626 return Dcl; 10627} 10628 10629void Sema::LoadExternalVTableUses() { 10630 if (!ExternalSource) 10631 return; 10632 10633 SmallVector<ExternalVTableUse, 4> VTables; 10634 ExternalSource->ReadUsedVTables(VTables); 10635 SmallVector<VTableUse, 4> NewUses; 10636 for (unsigned I = 0, N = VTables.size(); I != N; ++I) { 10637 llvm::DenseMap<CXXRecordDecl *, bool>::iterator Pos 10638 = VTablesUsed.find(VTables[I].Record); 10639 // Even if a definition wasn't required before, it may be required now. 10640 if (Pos != VTablesUsed.end()) { 10641 if (!Pos->second && VTables[I].DefinitionRequired) 10642 Pos->second = true; 10643 continue; 10644 } 10645 10646 VTablesUsed[VTables[I].Record] = VTables[I].DefinitionRequired; 10647 NewUses.push_back(VTableUse(VTables[I].Record, VTables[I].Location)); 10648 } 10649 10650 VTableUses.insert(VTableUses.begin(), NewUses.begin(), NewUses.end()); 10651} 10652 10653void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 10654 bool DefinitionRequired) { 10655 // Ignore any vtable uses in unevaluated operands or for classes that do 10656 // not have a vtable. 10657 if (!Class->isDynamicClass() || Class->isDependentContext() || 10658 CurContext->isDependentContext() || 10659 ExprEvalContexts.back().Context == Unevaluated) 10660 return; 10661 10662 // Try to insert this class into the map. 10663 LoadExternalVTableUses(); 10664 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 10665 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 10666 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 10667 if (!Pos.second) { 10668 // If we already had an entry, check to see if we are promoting this vtable 10669 // to required a definition. If so, we need to reappend to the VTableUses 10670 // list, since we may have already processed the first entry. 10671 if (DefinitionRequired && !Pos.first->second) { 10672 Pos.first->second = true; 10673 } else { 10674 // Otherwise, we can early exit. 10675 return; 10676 } 10677 } 10678 10679 // Local classes need to have their virtual members marked 10680 // immediately. For all other classes, we mark their virtual members 10681 // at the end of the translation unit. 10682 if (Class->isLocalClass()) 10683 MarkVirtualMembersReferenced(Loc, Class); 10684 else 10685 VTableUses.push_back(std::make_pair(Class, Loc)); 10686} 10687 10688bool Sema::DefineUsedVTables() { 10689 LoadExternalVTableUses(); 10690 if (VTableUses.empty()) 10691 return false; 10692 10693 // Note: The VTableUses vector could grow as a result of marking 10694 // the members of a class as "used", so we check the size each 10695 // time through the loop and prefer indices (with are stable) to 10696 // iterators (which are not). 10697 bool DefinedAnything = false; 10698 for (unsigned I = 0; I != VTableUses.size(); ++I) { 10699 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 10700 if (!Class) 10701 continue; 10702 10703 SourceLocation Loc = VTableUses[I].second; 10704 10705 // If this class has a key function, but that key function is 10706 // defined in another translation unit, we don't need to emit the 10707 // vtable even though we're using it. 10708 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class); 10709 if (KeyFunction && !KeyFunction->hasBody()) { 10710 switch (KeyFunction->getTemplateSpecializationKind()) { 10711 case TSK_Undeclared: 10712 case TSK_ExplicitSpecialization: 10713 case TSK_ExplicitInstantiationDeclaration: 10714 // The key function is in another translation unit. 10715 continue; 10716 10717 case TSK_ExplicitInstantiationDefinition: 10718 case TSK_ImplicitInstantiation: 10719 // We will be instantiating the key function. 10720 break; 10721 } 10722 } else if (!KeyFunction) { 10723 // If we have a class with no key function that is the subject 10724 // of an explicit instantiation declaration, suppress the 10725 // vtable; it will live with the explicit instantiation 10726 // definition. 10727 bool IsExplicitInstantiationDeclaration 10728 = Class->getTemplateSpecializationKind() 10729 == TSK_ExplicitInstantiationDeclaration; 10730 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 10731 REnd = Class->redecls_end(); 10732 R != REnd; ++R) { 10733 TemplateSpecializationKind TSK 10734 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 10735 if (TSK == TSK_ExplicitInstantiationDeclaration) 10736 IsExplicitInstantiationDeclaration = true; 10737 else if (TSK == TSK_ExplicitInstantiationDefinition) { 10738 IsExplicitInstantiationDeclaration = false; 10739 break; 10740 } 10741 } 10742 10743 if (IsExplicitInstantiationDeclaration) 10744 continue; 10745 } 10746 10747 // Mark all of the virtual members of this class as referenced, so 10748 // that we can build a vtable. Then, tell the AST consumer that a 10749 // vtable for this class is required. 10750 DefinedAnything = true; 10751 MarkVirtualMembersReferenced(Loc, Class); 10752 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 10753 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 10754 10755 // Optionally warn if we're emitting a weak vtable. 10756 if (Class->getLinkage() == ExternalLinkage && 10757 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 10758 const FunctionDecl *KeyFunctionDef = 0; 10759 if (!KeyFunction || 10760 (KeyFunction->hasBody(KeyFunctionDef) && 10761 KeyFunctionDef->isInlined())) 10762 Diag(Class->getLocation(), Class->getTemplateSpecializationKind() == 10763 TSK_ExplicitInstantiationDefinition 10764 ? diag::warn_weak_template_vtable : diag::warn_weak_vtable) 10765 << Class; 10766 } 10767 } 10768 VTableUses.clear(); 10769 10770 return DefinedAnything; 10771} 10772 10773void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 10774 const CXXRecordDecl *RD) { 10775 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 10776 e = RD->method_end(); i != e; ++i) { 10777 CXXMethodDecl *MD = *i; 10778 10779 // C++ [basic.def.odr]p2: 10780 // [...] A virtual member function is used if it is not pure. [...] 10781 if (MD->isVirtual() && !MD->isPure()) 10782 MarkFunctionReferenced(Loc, MD); 10783 } 10784 10785 // Only classes that have virtual bases need a VTT. 10786 if (RD->getNumVBases() == 0) 10787 return; 10788 10789 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 10790 e = RD->bases_end(); i != e; ++i) { 10791 const CXXRecordDecl *Base = 10792 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 10793 if (Base->getNumVBases() == 0) 10794 continue; 10795 MarkVirtualMembersReferenced(Loc, Base); 10796 } 10797} 10798 10799/// SetIvarInitializers - This routine builds initialization ASTs for the 10800/// Objective-C implementation whose ivars need be initialized. 10801void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 10802 if (!getLangOpts().CPlusPlus) 10803 return; 10804 if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 10805 SmallVector<ObjCIvarDecl*, 8> ivars; 10806 CollectIvarsToConstructOrDestruct(OID, ivars); 10807 if (ivars.empty()) 10808 return; 10809 SmallVector<CXXCtorInitializer*, 32> AllToInit; 10810 for (unsigned i = 0; i < ivars.size(); i++) { 10811 FieldDecl *Field = ivars[i]; 10812 if (Field->isInvalidDecl()) 10813 continue; 10814 10815 CXXCtorInitializer *Member; 10816 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 10817 InitializationKind InitKind = 10818 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 10819 10820 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 10821 ExprResult MemberInit = 10822 InitSeq.Perform(*this, InitEntity, InitKind, MultiExprArg()); 10823 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 10824 // Note, MemberInit could actually come back empty if no initialization 10825 // is required (e.g., because it would call a trivial default constructor) 10826 if (!MemberInit.get() || MemberInit.isInvalid()) 10827 continue; 10828 10829 Member = 10830 new (Context) CXXCtorInitializer(Context, Field, SourceLocation(), 10831 SourceLocation(), 10832 MemberInit.takeAs<Expr>(), 10833 SourceLocation()); 10834 AllToInit.push_back(Member); 10835 10836 // Be sure that the destructor is accessible and is marked as referenced. 10837 if (const RecordType *RecordTy 10838 = Context.getBaseElementType(Field->getType()) 10839 ->getAs<RecordType>()) { 10840 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 10841 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 10842 MarkFunctionReferenced(Field->getLocation(), Destructor); 10843 CheckDestructorAccess(Field->getLocation(), Destructor, 10844 PDiag(diag::err_access_dtor_ivar) 10845 << Context.getBaseElementType(Field->getType())); 10846 } 10847 } 10848 } 10849 ObjCImplementation->setIvarInitializers(Context, 10850 AllToInit.data(), AllToInit.size()); 10851 } 10852} 10853 10854static 10855void DelegatingCycleHelper(CXXConstructorDecl* Ctor, 10856 llvm::SmallSet<CXXConstructorDecl*, 4> &Valid, 10857 llvm::SmallSet<CXXConstructorDecl*, 4> &Invalid, 10858 llvm::SmallSet<CXXConstructorDecl*, 4> &Current, 10859 Sema &S) { 10860 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 10861 CE = Current.end(); 10862 if (Ctor->isInvalidDecl()) 10863 return; 10864 10865 const FunctionDecl *FNTarget = 0; 10866 CXXConstructorDecl *Target; 10867 10868 // We ignore the result here since if we don't have a body, Target will be 10869 // null below. 10870 (void)Ctor->getTargetConstructor()->hasBody(FNTarget); 10871 Target 10872= const_cast<CXXConstructorDecl*>(cast_or_null<CXXConstructorDecl>(FNTarget)); 10873 10874 CXXConstructorDecl *Canonical = Ctor->getCanonicalDecl(), 10875 // Avoid dereferencing a null pointer here. 10876 *TCanonical = Target ? Target->getCanonicalDecl() : 0; 10877 10878 if (!Current.insert(Canonical)) 10879 return; 10880 10881 // We know that beyond here, we aren't chaining into a cycle. 10882 if (!Target || !Target->isDelegatingConstructor() || 10883 Target->isInvalidDecl() || Valid.count(TCanonical)) { 10884 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 10885 Valid.insert(*CI); 10886 Current.clear(); 10887 // We've hit a cycle. 10888 } else if (TCanonical == Canonical || Invalid.count(TCanonical) || 10889 Current.count(TCanonical)) { 10890 // If we haven't diagnosed this cycle yet, do so now. 10891 if (!Invalid.count(TCanonical)) { 10892 S.Diag((*Ctor->init_begin())->getSourceLocation(), 10893 diag::warn_delegating_ctor_cycle) 10894 << Ctor; 10895 10896 // Don't add a note for a function delegating directo to itself. 10897 if (TCanonical != Canonical) 10898 S.Diag(Target->getLocation(), diag::note_it_delegates_to); 10899 10900 CXXConstructorDecl *C = Target; 10901 while (C->getCanonicalDecl() != Canonical) { 10902 (void)C->getTargetConstructor()->hasBody(FNTarget); 10903 assert(FNTarget && "Ctor cycle through bodiless function"); 10904 10905 C 10906 = const_cast<CXXConstructorDecl*>(cast<CXXConstructorDecl>(FNTarget)); 10907 S.Diag(C->getLocation(), diag::note_which_delegates_to); 10908 } 10909 } 10910 10911 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 10912 Invalid.insert(*CI); 10913 Current.clear(); 10914 } else { 10915 DelegatingCycleHelper(Target, Valid, Invalid, Current, S); 10916 } 10917} 10918 10919 10920void Sema::CheckDelegatingCtorCycles() { 10921 llvm::SmallSet<CXXConstructorDecl*, 4> Valid, Invalid, Current; 10922 10923 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 10924 CE = Current.end(); 10925 10926 for (DelegatingCtorDeclsType::iterator 10927 I = DelegatingCtorDecls.begin(ExternalSource), 10928 E = DelegatingCtorDecls.end(); 10929 I != E; ++I) { 10930 DelegatingCycleHelper(*I, Valid, Invalid, Current, *this); 10931 } 10932 10933 for (CI = Invalid.begin(), CE = Invalid.end(); CI != CE; ++CI) 10934 (*CI)->setInvalidDecl(); 10935} 10936 10937namespace { 10938 /// \brief AST visitor that finds references to the 'this' expression. 10939 class FindCXXThisExpr : public RecursiveASTVisitor<FindCXXThisExpr> { 10940 Sema &S; 10941 10942 public: 10943 explicit FindCXXThisExpr(Sema &S) : S(S) { } 10944 10945 bool VisitCXXThisExpr(CXXThisExpr *E) { 10946 S.Diag(E->getLocation(), diag::err_this_static_member_func) 10947 << E->isImplicit(); 10948 return false; 10949 } 10950 }; 10951} 10952 10953bool Sema::checkThisInStaticMemberFunctionType(CXXMethodDecl *Method) { 10954 TypeSourceInfo *TSInfo = Method->getTypeSourceInfo(); 10955 if (!TSInfo) 10956 return false; 10957 10958 TypeLoc TL = TSInfo->getTypeLoc(); 10959 FunctionProtoTypeLoc *ProtoTL = dyn_cast<FunctionProtoTypeLoc>(&TL); 10960 if (!ProtoTL) 10961 return false; 10962 10963 // C++11 [expr.prim.general]p3: 10964 // [The expression this] shall not appear before the optional 10965 // cv-qualifier-seq and it shall not appear within the declaration of a 10966 // static member function (although its type and value category are defined 10967 // within a static member function as they are within a non-static member 10968 // function). [ Note: this is because declaration matching does not occur 10969 // until the complete declarator is known. - end note ] 10970 const FunctionProtoType *Proto = ProtoTL->getTypePtr(); 10971 FindCXXThisExpr Finder(*this); 10972 10973 // If the return type came after the cv-qualifier-seq, check it now. 10974 if (Proto->hasTrailingReturn() && 10975 !Finder.TraverseTypeLoc(ProtoTL->getResultLoc())) 10976 return true; 10977 10978 // Check the exception specification. 10979 if (checkThisInStaticMemberFunctionExceptionSpec(Method)) 10980 return true; 10981 10982 return checkThisInStaticMemberFunctionAttributes(Method); 10983} 10984 10985bool Sema::checkThisInStaticMemberFunctionExceptionSpec(CXXMethodDecl *Method) { 10986 TypeSourceInfo *TSInfo = Method->getTypeSourceInfo(); 10987 if (!TSInfo) 10988 return false; 10989 10990 TypeLoc TL = TSInfo->getTypeLoc(); 10991 FunctionProtoTypeLoc *ProtoTL = dyn_cast<FunctionProtoTypeLoc>(&TL); 10992 if (!ProtoTL) 10993 return false; 10994 10995 const FunctionProtoType *Proto = ProtoTL->getTypePtr(); 10996 FindCXXThisExpr Finder(*this); 10997 10998 switch (Proto->getExceptionSpecType()) { 10999 case EST_Uninstantiated: 11000 case EST_BasicNoexcept: 11001 case EST_Delayed: 11002 case EST_DynamicNone: 11003 case EST_MSAny: 11004 case EST_None: 11005 break; 11006 11007 case EST_ComputedNoexcept: 11008 if (!Finder.TraverseStmt(Proto->getNoexceptExpr())) 11009 return true; 11010 11011 case EST_Dynamic: 11012 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(), 11013 EEnd = Proto->exception_end(); 11014 E != EEnd; ++E) { 11015 if (!Finder.TraverseType(*E)) 11016 return true; 11017 } 11018 break; 11019 } 11020 11021 return false; 11022} 11023 11024bool Sema::checkThisInStaticMemberFunctionAttributes(CXXMethodDecl *Method) { 11025 FindCXXThisExpr Finder(*this); 11026 11027 // Check attributes. 11028 for (Decl::attr_iterator A = Method->attr_begin(), AEnd = Method->attr_end(); 11029 A != AEnd; ++A) { 11030 // FIXME: This should be emitted by tblgen. 11031 Expr *Arg = 0; 11032 ArrayRef<Expr *> Args; 11033 if (GuardedByAttr *G = dyn_cast<GuardedByAttr>(*A)) 11034 Arg = G->getArg(); 11035 else if (PtGuardedByAttr *G = dyn_cast<PtGuardedByAttr>(*A)) 11036 Arg = G->getArg(); 11037 else if (AcquiredAfterAttr *AA = dyn_cast<AcquiredAfterAttr>(*A)) 11038 Args = ArrayRef<Expr *>(AA->args_begin(), AA->args_size()); 11039 else if (AcquiredBeforeAttr *AB = dyn_cast<AcquiredBeforeAttr>(*A)) 11040 Args = ArrayRef<Expr *>(AB->args_begin(), AB->args_size()); 11041 else if (ExclusiveLockFunctionAttr *ELF 11042 = dyn_cast<ExclusiveLockFunctionAttr>(*A)) 11043 Args = ArrayRef<Expr *>(ELF->args_begin(), ELF->args_size()); 11044 else if (SharedLockFunctionAttr *SLF 11045 = dyn_cast<SharedLockFunctionAttr>(*A)) 11046 Args = ArrayRef<Expr *>(SLF->args_begin(), SLF->args_size()); 11047 else if (ExclusiveTrylockFunctionAttr *ETLF 11048 = dyn_cast<ExclusiveTrylockFunctionAttr>(*A)) { 11049 Arg = ETLF->getSuccessValue(); 11050 Args = ArrayRef<Expr *>(ETLF->args_begin(), ETLF->args_size()); 11051 } else if (SharedTrylockFunctionAttr *STLF 11052 = dyn_cast<SharedTrylockFunctionAttr>(*A)) { 11053 Arg = STLF->getSuccessValue(); 11054 Args = ArrayRef<Expr *>(STLF->args_begin(), STLF->args_size()); 11055 } else if (UnlockFunctionAttr *UF = dyn_cast<UnlockFunctionAttr>(*A)) 11056 Args = ArrayRef<Expr *>(UF->args_begin(), UF->args_size()); 11057 else if (LockReturnedAttr *LR = dyn_cast<LockReturnedAttr>(*A)) 11058 Arg = LR->getArg(); 11059 else if (LocksExcludedAttr *LE = dyn_cast<LocksExcludedAttr>(*A)) 11060 Args = ArrayRef<Expr *>(LE->args_begin(), LE->args_size()); 11061 else if (ExclusiveLocksRequiredAttr *ELR 11062 = dyn_cast<ExclusiveLocksRequiredAttr>(*A)) 11063 Args = ArrayRef<Expr *>(ELR->args_begin(), ELR->args_size()); 11064 else if (SharedLocksRequiredAttr *SLR 11065 = dyn_cast<SharedLocksRequiredAttr>(*A)) 11066 Args = ArrayRef<Expr *>(SLR->args_begin(), SLR->args_size()); 11067 11068 if (Arg && !Finder.TraverseStmt(Arg)) 11069 return true; 11070 11071 for (unsigned I = 0, N = Args.size(); I != N; ++I) { 11072 if (!Finder.TraverseStmt(Args[I])) 11073 return true; 11074 } 11075 } 11076 11077 return false; 11078} 11079 11080void 11081Sema::checkExceptionSpecification(ExceptionSpecificationType EST, 11082 ArrayRef<ParsedType> DynamicExceptions, 11083 ArrayRef<SourceRange> DynamicExceptionRanges, 11084 Expr *NoexceptExpr, 11085 llvm::SmallVectorImpl<QualType> &Exceptions, 11086 FunctionProtoType::ExtProtoInfo &EPI) { 11087 Exceptions.clear(); 11088 EPI.ExceptionSpecType = EST; 11089 if (EST == EST_Dynamic) { 11090 Exceptions.reserve(DynamicExceptions.size()); 11091 for (unsigned ei = 0, ee = DynamicExceptions.size(); ei != ee; ++ei) { 11092 // FIXME: Preserve type source info. 11093 QualType ET = GetTypeFromParser(DynamicExceptions[ei]); 11094 11095 SmallVector<UnexpandedParameterPack, 2> Unexpanded; 11096 collectUnexpandedParameterPacks(ET, Unexpanded); 11097 if (!Unexpanded.empty()) { 11098 DiagnoseUnexpandedParameterPacks(DynamicExceptionRanges[ei].getBegin(), 11099 UPPC_ExceptionType, 11100 Unexpanded); 11101 continue; 11102 } 11103 11104 // Check that the type is valid for an exception spec, and 11105 // drop it if not. 11106 if (!CheckSpecifiedExceptionType(ET, DynamicExceptionRanges[ei])) 11107 Exceptions.push_back(ET); 11108 } 11109 EPI.NumExceptions = Exceptions.size(); 11110 EPI.Exceptions = Exceptions.data(); 11111 return; 11112 } 11113 11114 if (EST == EST_ComputedNoexcept) { 11115 // If an error occurred, there's no expression here. 11116 if (NoexceptExpr) { 11117 assert((NoexceptExpr->isTypeDependent() || 11118 NoexceptExpr->getType()->getCanonicalTypeUnqualified() == 11119 Context.BoolTy) && 11120 "Parser should have made sure that the expression is boolean"); 11121 if (NoexceptExpr && DiagnoseUnexpandedParameterPack(NoexceptExpr)) { 11122 EPI.ExceptionSpecType = EST_BasicNoexcept; 11123 return; 11124 } 11125 11126 if (!NoexceptExpr->isValueDependent()) 11127 NoexceptExpr = VerifyIntegerConstantExpression(NoexceptExpr, 0, 11128 diag::err_noexcept_needs_constant_expression, 11129 /*AllowFold*/ false).take(); 11130 EPI.NoexceptExpr = NoexceptExpr; 11131 } 11132 return; 11133 } 11134} 11135 11136/// IdentifyCUDATarget - Determine the CUDA compilation target for this function 11137Sema::CUDAFunctionTarget Sema::IdentifyCUDATarget(const FunctionDecl *D) { 11138 // Implicitly declared functions (e.g. copy constructors) are 11139 // __host__ __device__ 11140 if (D->isImplicit()) 11141 return CFT_HostDevice; 11142 11143 if (D->hasAttr<CUDAGlobalAttr>()) 11144 return CFT_Global; 11145 11146 if (D->hasAttr<CUDADeviceAttr>()) { 11147 if (D->hasAttr<CUDAHostAttr>()) 11148 return CFT_HostDevice; 11149 else 11150 return CFT_Device; 11151 } 11152 11153 return CFT_Host; 11154} 11155 11156bool Sema::CheckCUDATarget(CUDAFunctionTarget CallerTarget, 11157 CUDAFunctionTarget CalleeTarget) { 11158 // CUDA B.1.1 "The __device__ qualifier declares a function that is... 11159 // Callable from the device only." 11160 if (CallerTarget == CFT_Host && CalleeTarget == CFT_Device) 11161 return true; 11162 11163 // CUDA B.1.2 "The __global__ qualifier declares a function that is... 11164 // Callable from the host only." 11165 // CUDA B.1.3 "The __host__ qualifier declares a function that is... 11166 // Callable from the host only." 11167 if ((CallerTarget == CFT_Device || CallerTarget == CFT_Global) && 11168 (CalleeTarget == CFT_Host || CalleeTarget == CFT_Global)) 11169 return true; 11170 11171 if (CallerTarget == CFT_HostDevice && CalleeTarget != CFT_HostDevice) 11172 return true; 11173 11174 return false; 11175} 11176