SemaDeclCXX.cpp revision 7756afa6273cf708b5e3fbd6a6478eb2cada27e2
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 case Sema::CXXCopyConstructor: 3901 case Sema::CXXMoveConstructor: 3902 break; 3903 3904 case Sema::CXXCopyAssignment: 3905 case Sema::CXXMoveAssignment: 3906 case Sema::CXXDestructor: 3907 case Sema::CXXInvalid: 3908 return false; 3909 } 3910 3911 // -- if the class is a non-empty union, or for each non-empty anonymous 3912 // union member of a non-union class, exactly one non-static data member 3913 // shall be initialized; [DR1359] 3914 if (ClassDecl->isUnion()) 3915 // FIXME: In the default constructor case, we should check that the 3916 // in-class initializer is actually a constant expression. 3917 return CSM != Sema::CXXDefaultConstructor || 3918 ClassDecl->hasInClassInitializer(); 3919 3920 // -- the class shall not have any virtual base classes; 3921 if (ClassDecl->getNumVBases()) 3922 return false; 3923 3924 // -- every constructor involved in initializing [...] base class 3925 // sub-objects shall be a constexpr constructor; 3926 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 3927 BEnd = ClassDecl->bases_end(); 3928 B != BEnd; ++B) { 3929 const RecordType *BaseType = B->getType()->getAs<RecordType>(); 3930 if (!BaseType) continue; 3931 3932 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 3933 if (!specialMemberIsConstexpr(S, BaseClassDecl, CSM, ConstArg)) 3934 return false; 3935 } 3936 3937 // -- every constructor involved in initializing non-static data members 3938 // [...] shall be a constexpr constructor; 3939 // -- every non-static data member and base class sub-object shall be 3940 // initialized 3941 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 3942 FEnd = ClassDecl->field_end(); 3943 F != FEnd; ++F) { 3944 if (F->isInvalidDecl()) 3945 continue; 3946 if (CSM == Sema::CXXDefaultConstructor && F->hasInClassInitializer()) { 3947 // -- every assignment-expression that is an initializer-clause appearing 3948 // directly or indirectly within a brace-or-equal-initializer for a 3949 // non-static data member [...] shall be a constant expression; 3950 // 3951 // We consider this bullet to be a defect, since it results in this type 3952 // having a non-constexpr default constructor: 3953 // struct S { 3954 // int a = 0; 3955 // int b = a; 3956 // }; 3957 // FIXME: We should still check that the constructor selected for this 3958 // initialization (if any) is constexpr. 3959 } else if (const RecordType *RecordTy = 3960 S.Context.getBaseElementType(F->getType())-> 3961 getAs<RecordType>()) { 3962 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 3963 if (!specialMemberIsConstexpr(S, FieldRecDecl, CSM, ConstArg)) 3964 return false; 3965 } else if (CSM == Sema::CXXDefaultConstructor) { 3966 // No in-class initializer, and not a class type. This member isn't going 3967 // to be initialized. 3968 return false; 3969 } 3970 } 3971 3972 // All OK, it's constexpr! 3973 return true; 3974} 3975 3976void Sema::CheckExplicitlyDefaultedSpecialMember(CXXMethodDecl *MD) { 3977 CXXRecordDecl *RD = MD->getParent(); 3978 CXXSpecialMember CSM = getSpecialMember(MD); 3979 3980 assert(MD->isExplicitlyDefaulted() && CSM != CXXInvalid && 3981 "not an explicitly-defaulted special member"); 3982 3983 // Whether this was the first-declared instance of the constructor. 3984 // This affects whether we implicitly add an exception spec and constexpr. 3985 bool First = MD == MD->getCanonicalDecl(); 3986 3987 bool HadError = false; 3988 3989 // C++11 [dcl.fct.def.default]p1: 3990 // A function that is explicitly defaulted shall 3991 // -- be a special member function (checked elsewhere), 3992 // -- have the same type (except for ref-qualifiers, and except that a 3993 // copy operation can take a non-const reference) as an implicit 3994 // declaration, and 3995 // -- not have default arguments. 3996 unsigned ExpectedParams = 1; 3997 if (CSM == CXXDefaultConstructor || CSM == CXXDestructor) 3998 ExpectedParams = 0; 3999 if (MD->getNumParams() != ExpectedParams) { 4000 // This also checks for default arguments: a copy or move constructor with a 4001 // default argument is classified as a default constructor, and assignment 4002 // operations and destructors can't have default arguments. 4003 Diag(MD->getLocation(), diag::err_defaulted_special_member_params) 4004 << CSM << MD->getSourceRange(); 4005 HadError = true; 4006 } 4007 4008 const FunctionProtoType *Type = MD->getType()->getAs<FunctionProtoType>(); 4009 4010 // Compute implicit exception specification, argument constness, constexpr 4011 // and triviality. 4012 ImplicitExceptionSpecification Spec(*this); 4013 bool CanHaveConstParam = false; 4014 bool Trivial; 4015 switch (CSM) { 4016 case CXXDefaultConstructor: 4017 Spec = ComputeDefaultedDefaultCtorExceptionSpec(RD); 4018 if (Spec.isDelayed()) 4019 // Exception specification depends on some deferred part of the class. 4020 // We'll try again when the class's definition has been fully processed. 4021 return; 4022 Trivial = RD->hasTrivialDefaultConstructor(); 4023 break; 4024 case CXXCopyConstructor: 4025 llvm::tie(Spec, CanHaveConstParam) = 4026 ComputeDefaultedCopyCtorExceptionSpecAndConst(RD); 4027 Trivial = RD->hasTrivialCopyConstructor(); 4028 break; 4029 case CXXCopyAssignment: 4030 llvm::tie(Spec, CanHaveConstParam) = 4031 ComputeDefaultedCopyAssignmentExceptionSpecAndConst(RD); 4032 Trivial = RD->hasTrivialCopyAssignment(); 4033 break; 4034 case CXXMoveConstructor: 4035 Spec = ComputeDefaultedMoveCtorExceptionSpec(RD); 4036 Trivial = RD->hasTrivialMoveConstructor(); 4037 break; 4038 case CXXMoveAssignment: 4039 Spec = ComputeDefaultedMoveAssignmentExceptionSpec(RD); 4040 Trivial = RD->hasTrivialMoveAssignment(); 4041 break; 4042 case CXXDestructor: 4043 Spec = ComputeDefaultedDtorExceptionSpec(RD); 4044 Trivial = RD->hasTrivialDestructor(); 4045 break; 4046 case CXXInvalid: 4047 llvm_unreachable("non-special member explicitly defaulted!"); 4048 } 4049 4050 QualType ReturnType = Context.VoidTy; 4051 if (CSM == CXXCopyAssignment || CSM == CXXMoveAssignment) { 4052 // Check for return type matching. 4053 ReturnType = Type->getResultType(); 4054 QualType ExpectedReturnType = 4055 Context.getLValueReferenceType(Context.getTypeDeclType(RD)); 4056 if (!Context.hasSameType(ReturnType, ExpectedReturnType)) { 4057 Diag(MD->getLocation(), diag::err_defaulted_special_member_return_type) 4058 << (CSM == CXXMoveAssignment) << ExpectedReturnType; 4059 HadError = true; 4060 } 4061 4062 // A defaulted special member cannot have cv-qualifiers. 4063 if (Type->getTypeQuals()) { 4064 Diag(MD->getLocation(), diag::err_defaulted_special_member_quals) 4065 << (CSM == CXXMoveAssignment); 4066 HadError = true; 4067 } 4068 } 4069 4070 // Check for parameter type matching. 4071 QualType ArgType = ExpectedParams ? Type->getArgType(0) : QualType(); 4072 bool HasConstParam = false; 4073 if (ExpectedParams && ArgType->isReferenceType()) { 4074 // Argument must be reference to possibly-const T. 4075 QualType ReferentType = ArgType->getPointeeType(); 4076 HasConstParam = ReferentType.isConstQualified(); 4077 4078 if (ReferentType.isVolatileQualified()) { 4079 Diag(MD->getLocation(), 4080 diag::err_defaulted_special_member_volatile_param) << CSM; 4081 HadError = true; 4082 } 4083 4084 if (HasConstParam && !CanHaveConstParam) { 4085 if (CSM == CXXCopyConstructor || CSM == CXXCopyAssignment) { 4086 Diag(MD->getLocation(), 4087 diag::err_defaulted_special_member_copy_const_param) 4088 << (CSM == CXXCopyAssignment); 4089 // FIXME: Explain why this special member can't be const. 4090 } else { 4091 Diag(MD->getLocation(), 4092 diag::err_defaulted_special_member_move_const_param) 4093 << (CSM == CXXMoveAssignment); 4094 } 4095 HadError = true; 4096 } 4097 4098 // If a function is explicitly defaulted on its first declaration, it shall 4099 // have the same parameter type as if it had been implicitly declared. 4100 // (Presumably this is to prevent it from being trivial?) 4101 if (!HasConstParam && CanHaveConstParam && First) 4102 Diag(MD->getLocation(), 4103 diag::err_defaulted_special_member_copy_non_const_param) 4104 << (CSM == CXXCopyAssignment); 4105 } else if (ExpectedParams) { 4106 // A copy assignment operator can take its argument by value, but a 4107 // defaulted one cannot. 4108 assert(CSM == CXXCopyAssignment && "unexpected non-ref argument"); 4109 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_not_ref); 4110 HadError = true; 4111 } 4112 4113 // Rebuild the type with the implicit exception specification added. 4114 FunctionProtoType::ExtProtoInfo EPI = Type->getExtProtoInfo(); 4115 Spec.getEPI(EPI); 4116 const FunctionProtoType *ImplicitType = cast<FunctionProtoType>( 4117 Context.getFunctionType(ReturnType, &ArgType, ExpectedParams, EPI)); 4118 4119 // C++11 [dcl.fct.def.default]p2: 4120 // An explicitly-defaulted function may be declared constexpr only if it 4121 // would have been implicitly declared as constexpr, 4122 // Do not apply this rule to members of class templates, since core issue 1358 4123 // makes such functions always instantiate to constexpr functions. For 4124 // non-constructors, this is checked elsewhere. 4125 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, RD, CSM, 4126 HasConstParam); 4127 if (isa<CXXConstructorDecl>(MD) && MD->isConstexpr() && !Constexpr && 4128 MD->getTemplatedKind() == FunctionDecl::TK_NonTemplate) { 4129 Diag(MD->getLocStart(), diag::err_incorrect_defaulted_constexpr) << CSM; 4130 // FIXME: Explain why the constructor can't be constexpr. 4131 HadError = true; 4132 } 4133 // and may have an explicit exception-specification only if it is compatible 4134 // with the exception-specification on the implicit declaration. 4135 if (Type->hasExceptionSpec() && 4136 CheckEquivalentExceptionSpec( 4137 PDiag(diag::err_incorrect_defaulted_exception_spec) << CSM, 4138 PDiag(), ImplicitType, SourceLocation(), Type, MD->getLocation())) 4139 HadError = true; 4140 4141 // If a function is explicitly defaulted on its first declaration, 4142 if (First) { 4143 // -- it is implicitly considered to be constexpr if the implicit 4144 // definition would be, 4145 MD->setConstexpr(Constexpr); 4146 4147 // -- it is implicitly considered to have the same exception-specification 4148 // as if it had been implicitly declared, 4149 MD->setType(QualType(ImplicitType, 0)); 4150 4151 // Such a function is also trivial if the implicitly-declared function 4152 // would have been. 4153 MD->setTrivial(Trivial); 4154 } 4155 4156 if (ShouldDeleteSpecialMember(MD, CSM)) { 4157 if (First) { 4158 MD->setDeletedAsWritten(); 4159 } else { 4160 // C++11 [dcl.fct.def.default]p4: 4161 // [For a] user-provided explicitly-defaulted function [...] if such a 4162 // function is implicitly defined as deleted, the program is ill-formed. 4163 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) << CSM; 4164 HadError = true; 4165 } 4166 } 4167 4168 if (HadError) 4169 MD->setInvalidDecl(); 4170} 4171 4172namespace { 4173struct SpecialMemberDeletionInfo { 4174 Sema &S; 4175 CXXMethodDecl *MD; 4176 Sema::CXXSpecialMember CSM; 4177 bool Diagnose; 4178 4179 // Properties of the special member, computed for convenience. 4180 bool IsConstructor, IsAssignment, IsMove, ConstArg, VolatileArg; 4181 SourceLocation Loc; 4182 4183 bool AllFieldsAreConst; 4184 4185 SpecialMemberDeletionInfo(Sema &S, CXXMethodDecl *MD, 4186 Sema::CXXSpecialMember CSM, bool Diagnose) 4187 : S(S), MD(MD), CSM(CSM), Diagnose(Diagnose), 4188 IsConstructor(false), IsAssignment(false), IsMove(false), 4189 ConstArg(false), VolatileArg(false), Loc(MD->getLocation()), 4190 AllFieldsAreConst(true) { 4191 switch (CSM) { 4192 case Sema::CXXDefaultConstructor: 4193 case Sema::CXXCopyConstructor: 4194 IsConstructor = true; 4195 break; 4196 case Sema::CXXMoveConstructor: 4197 IsConstructor = true; 4198 IsMove = true; 4199 break; 4200 case Sema::CXXCopyAssignment: 4201 IsAssignment = true; 4202 break; 4203 case Sema::CXXMoveAssignment: 4204 IsAssignment = true; 4205 IsMove = true; 4206 break; 4207 case Sema::CXXDestructor: 4208 break; 4209 case Sema::CXXInvalid: 4210 llvm_unreachable("invalid special member kind"); 4211 } 4212 4213 if (MD->getNumParams()) { 4214 ConstArg = MD->getParamDecl(0)->getType().isConstQualified(); 4215 VolatileArg = MD->getParamDecl(0)->getType().isVolatileQualified(); 4216 } 4217 } 4218 4219 bool inUnion() const { return MD->getParent()->isUnion(); } 4220 4221 /// Look up the corresponding special member in the given class. 4222 Sema::SpecialMemberOverloadResult *lookupIn(CXXRecordDecl *Class) { 4223 unsigned TQ = MD->getTypeQualifiers(); 4224 return S.LookupSpecialMember(Class, CSM, ConstArg, VolatileArg, 4225 MD->getRefQualifier() == RQ_RValue, 4226 TQ & Qualifiers::Const, 4227 TQ & Qualifiers::Volatile); 4228 } 4229 4230 typedef llvm::PointerUnion<CXXBaseSpecifier*, FieldDecl*> Subobject; 4231 4232 bool shouldDeleteForBase(CXXBaseSpecifier *Base); 4233 bool shouldDeleteForField(FieldDecl *FD); 4234 bool shouldDeleteForAllConstMembers(); 4235 4236 bool shouldDeleteForClassSubobject(CXXRecordDecl *Class, Subobject Subobj); 4237 bool shouldDeleteForSubobjectCall(Subobject Subobj, 4238 Sema::SpecialMemberOverloadResult *SMOR, 4239 bool IsDtorCallInCtor); 4240 4241 bool isAccessible(Subobject Subobj, CXXMethodDecl *D); 4242}; 4243} 4244 4245/// Is the given special member inaccessible when used on the given 4246/// sub-object. 4247bool SpecialMemberDeletionInfo::isAccessible(Subobject Subobj, 4248 CXXMethodDecl *target) { 4249 /// If we're operating on a base class, the object type is the 4250 /// type of this special member. 4251 QualType objectTy; 4252 AccessSpecifier access = target->getAccess();; 4253 if (CXXBaseSpecifier *base = Subobj.dyn_cast<CXXBaseSpecifier*>()) { 4254 objectTy = S.Context.getTypeDeclType(MD->getParent()); 4255 access = CXXRecordDecl::MergeAccess(base->getAccessSpecifier(), access); 4256 4257 // If we're operating on a field, the object type is the type of the field. 4258 } else { 4259 objectTy = S.Context.getTypeDeclType(target->getParent()); 4260 } 4261 4262 return S.isSpecialMemberAccessibleForDeletion(target, access, objectTy); 4263} 4264 4265/// Check whether we should delete a special member due to the implicit 4266/// definition containing a call to a special member of a subobject. 4267bool SpecialMemberDeletionInfo::shouldDeleteForSubobjectCall( 4268 Subobject Subobj, Sema::SpecialMemberOverloadResult *SMOR, 4269 bool IsDtorCallInCtor) { 4270 CXXMethodDecl *Decl = SMOR->getMethod(); 4271 FieldDecl *Field = Subobj.dyn_cast<FieldDecl*>(); 4272 4273 int DiagKind = -1; 4274 4275 if (SMOR->getKind() == Sema::SpecialMemberOverloadResult::NoMemberOrDeleted) 4276 DiagKind = !Decl ? 0 : 1; 4277 else if (SMOR->getKind() == Sema::SpecialMemberOverloadResult::Ambiguous) 4278 DiagKind = 2; 4279 else if (!isAccessible(Subobj, Decl)) 4280 DiagKind = 3; 4281 else if (!IsDtorCallInCtor && Field && Field->getParent()->isUnion() && 4282 !Decl->isTrivial()) { 4283 // A member of a union must have a trivial corresponding special member. 4284 // As a weird special case, a destructor call from a union's constructor 4285 // must be accessible and non-deleted, but need not be trivial. Such a 4286 // destructor is never actually called, but is semantically checked as 4287 // if it were. 4288 DiagKind = 4; 4289 } 4290 4291 if (DiagKind == -1) 4292 return false; 4293 4294 if (Diagnose) { 4295 if (Field) { 4296 S.Diag(Field->getLocation(), 4297 diag::note_deleted_special_member_class_subobject) 4298 << CSM << MD->getParent() << /*IsField*/true 4299 << Field << DiagKind << IsDtorCallInCtor; 4300 } else { 4301 CXXBaseSpecifier *Base = Subobj.get<CXXBaseSpecifier*>(); 4302 S.Diag(Base->getLocStart(), 4303 diag::note_deleted_special_member_class_subobject) 4304 << CSM << MD->getParent() << /*IsField*/false 4305 << Base->getType() << DiagKind << IsDtorCallInCtor; 4306 } 4307 4308 if (DiagKind == 1) 4309 S.NoteDeletedFunction(Decl); 4310 // FIXME: Explain inaccessibility if DiagKind == 3. 4311 } 4312 4313 return true; 4314} 4315 4316/// Check whether we should delete a special member function due to having a 4317/// direct or virtual base class or static data member of class type M. 4318bool SpecialMemberDeletionInfo::shouldDeleteForClassSubobject( 4319 CXXRecordDecl *Class, Subobject Subobj) { 4320 FieldDecl *Field = Subobj.dyn_cast<FieldDecl*>(); 4321 4322 // C++11 [class.ctor]p5: 4323 // -- any direct or virtual base class, or non-static data member with no 4324 // brace-or-equal-initializer, has class type M (or array thereof) and 4325 // either M has no default constructor or overload resolution as applied 4326 // to M's default constructor results in an ambiguity or in a function 4327 // that is deleted or inaccessible 4328 // C++11 [class.copy]p11, C++11 [class.copy]p23: 4329 // -- a direct or virtual base class B that cannot be copied/moved because 4330 // overload resolution, as applied to B's corresponding special member, 4331 // results in an ambiguity or a function that is deleted or inaccessible 4332 // from the defaulted special member 4333 // C++11 [class.dtor]p5: 4334 // -- any direct or virtual base class [...] has a type with a destructor 4335 // that is deleted or inaccessible 4336 if (!(CSM == Sema::CXXDefaultConstructor && 4337 Field && Field->hasInClassInitializer()) && 4338 shouldDeleteForSubobjectCall(Subobj, lookupIn(Class), false)) 4339 return true; 4340 4341 // C++11 [class.ctor]p5, C++11 [class.copy]p11: 4342 // -- any direct or virtual base class or non-static data member has a 4343 // type with a destructor that is deleted or inaccessible 4344 if (IsConstructor) { 4345 Sema::SpecialMemberOverloadResult *SMOR = 4346 S.LookupSpecialMember(Class, Sema::CXXDestructor, 4347 false, false, false, false, false); 4348 if (shouldDeleteForSubobjectCall(Subobj, SMOR, true)) 4349 return true; 4350 } 4351 4352 return false; 4353} 4354 4355/// Check whether we should delete a special member function due to the class 4356/// having a particular direct or virtual base class. 4357bool SpecialMemberDeletionInfo::shouldDeleteForBase(CXXBaseSpecifier *Base) { 4358 CXXRecordDecl *BaseClass = Base->getType()->getAsCXXRecordDecl(); 4359 return shouldDeleteForClassSubobject(BaseClass, Base); 4360} 4361 4362/// Check whether we should delete a special member function due to the class 4363/// having a particular non-static data member. 4364bool SpecialMemberDeletionInfo::shouldDeleteForField(FieldDecl *FD) { 4365 QualType FieldType = S.Context.getBaseElementType(FD->getType()); 4366 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4367 4368 if (CSM == Sema::CXXDefaultConstructor) { 4369 // For a default constructor, all references must be initialized in-class 4370 // and, if a union, it must have a non-const member. 4371 if (FieldType->isReferenceType() && !FD->hasInClassInitializer()) { 4372 if (Diagnose) 4373 S.Diag(FD->getLocation(), diag::note_deleted_default_ctor_uninit_field) 4374 << MD->getParent() << FD << FieldType << /*Reference*/0; 4375 return true; 4376 } 4377 // C++11 [class.ctor]p5: any non-variant non-static data member of 4378 // const-qualified type (or array thereof) with no 4379 // brace-or-equal-initializer does not have a user-provided default 4380 // constructor. 4381 if (!inUnion() && FieldType.isConstQualified() && 4382 !FD->hasInClassInitializer() && 4383 (!FieldRecord || !FieldRecord->hasUserProvidedDefaultConstructor())) { 4384 if (Diagnose) 4385 S.Diag(FD->getLocation(), diag::note_deleted_default_ctor_uninit_field) 4386 << MD->getParent() << FD << FD->getType() << /*Const*/1; 4387 return true; 4388 } 4389 4390 if (inUnion() && !FieldType.isConstQualified()) 4391 AllFieldsAreConst = false; 4392 } else if (CSM == Sema::CXXCopyConstructor) { 4393 // For a copy constructor, data members must not be of rvalue reference 4394 // type. 4395 if (FieldType->isRValueReferenceType()) { 4396 if (Diagnose) 4397 S.Diag(FD->getLocation(), diag::note_deleted_copy_ctor_rvalue_reference) 4398 << MD->getParent() << FD << FieldType; 4399 return true; 4400 } 4401 } else if (IsAssignment) { 4402 // For an assignment operator, data members must not be of reference type. 4403 if (FieldType->isReferenceType()) { 4404 if (Diagnose) 4405 S.Diag(FD->getLocation(), diag::note_deleted_assign_field) 4406 << IsMove << MD->getParent() << FD << FieldType << /*Reference*/0; 4407 return true; 4408 } 4409 if (!FieldRecord && FieldType.isConstQualified()) { 4410 // C++11 [class.copy]p23: 4411 // -- a non-static data member of const non-class type (or array thereof) 4412 if (Diagnose) 4413 S.Diag(FD->getLocation(), diag::note_deleted_assign_field) 4414 << IsMove << MD->getParent() << FD << FD->getType() << /*Const*/1; 4415 return true; 4416 } 4417 } 4418 4419 if (FieldRecord) { 4420 // Some additional restrictions exist on the variant members. 4421 if (!inUnion() && FieldRecord->isUnion() && 4422 FieldRecord->isAnonymousStructOrUnion()) { 4423 bool AllVariantFieldsAreConst = true; 4424 4425 // FIXME: Handle anonymous unions declared within anonymous unions. 4426 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4427 UE = FieldRecord->field_end(); 4428 UI != UE; ++UI) { 4429 QualType UnionFieldType = S.Context.getBaseElementType(UI->getType()); 4430 4431 if (!UnionFieldType.isConstQualified()) 4432 AllVariantFieldsAreConst = false; 4433 4434 CXXRecordDecl *UnionFieldRecord = UnionFieldType->getAsCXXRecordDecl(); 4435 if (UnionFieldRecord && 4436 shouldDeleteForClassSubobject(UnionFieldRecord, *UI)) 4437 return true; 4438 } 4439 4440 // At least one member in each anonymous union must be non-const 4441 if (CSM == Sema::CXXDefaultConstructor && AllVariantFieldsAreConst && 4442 FieldRecord->field_begin() != FieldRecord->field_end()) { 4443 if (Diagnose) 4444 S.Diag(FieldRecord->getLocation(), 4445 diag::note_deleted_default_ctor_all_const) 4446 << MD->getParent() << /*anonymous union*/1; 4447 return true; 4448 } 4449 4450 // Don't check the implicit member of the anonymous union type. 4451 // This is technically non-conformant, but sanity demands it. 4452 return false; 4453 } 4454 4455 if (shouldDeleteForClassSubobject(FieldRecord, FD)) 4456 return true; 4457 } 4458 4459 return false; 4460} 4461 4462/// C++11 [class.ctor] p5: 4463/// A defaulted default constructor for a class X is defined as deleted if 4464/// X is a union and all of its variant members are of const-qualified type. 4465bool SpecialMemberDeletionInfo::shouldDeleteForAllConstMembers() { 4466 // This is a silly definition, because it gives an empty union a deleted 4467 // default constructor. Don't do that. 4468 if (CSM == Sema::CXXDefaultConstructor && inUnion() && AllFieldsAreConst && 4469 (MD->getParent()->field_begin() != MD->getParent()->field_end())) { 4470 if (Diagnose) 4471 S.Diag(MD->getParent()->getLocation(), 4472 diag::note_deleted_default_ctor_all_const) 4473 << MD->getParent() << /*not anonymous union*/0; 4474 return true; 4475 } 4476 return false; 4477} 4478 4479/// Determine whether a defaulted special member function should be defined as 4480/// deleted, as specified in C++11 [class.ctor]p5, C++11 [class.copy]p11, 4481/// C++11 [class.copy]p23, and C++11 [class.dtor]p5. 4482bool Sema::ShouldDeleteSpecialMember(CXXMethodDecl *MD, CXXSpecialMember CSM, 4483 bool Diagnose) { 4484 assert(!MD->isInvalidDecl()); 4485 CXXRecordDecl *RD = MD->getParent(); 4486 assert(!RD->isDependentType() && "do deletion after instantiation"); 4487 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4488 return false; 4489 4490 // C++11 [expr.lambda.prim]p19: 4491 // The closure type associated with a lambda-expression has a 4492 // deleted (8.4.3) default constructor and a deleted copy 4493 // assignment operator. 4494 if (RD->isLambda() && 4495 (CSM == CXXDefaultConstructor || CSM == CXXCopyAssignment)) { 4496 if (Diagnose) 4497 Diag(RD->getLocation(), diag::note_lambda_decl); 4498 return true; 4499 } 4500 4501 // For an anonymous struct or union, the copy and assignment special members 4502 // will never be used, so skip the check. For an anonymous union declared at 4503 // namespace scope, the constructor and destructor are used. 4504 if (CSM != CXXDefaultConstructor && CSM != CXXDestructor && 4505 RD->isAnonymousStructOrUnion()) 4506 return false; 4507 4508 // C++11 [class.copy]p7, p18: 4509 // If the class definition declares a move constructor or move assignment 4510 // operator, an implicitly declared copy constructor or copy assignment 4511 // operator is defined as deleted. 4512 if (MD->isImplicit() && 4513 (CSM == CXXCopyConstructor || CSM == CXXCopyAssignment)) { 4514 CXXMethodDecl *UserDeclaredMove = 0; 4515 4516 // In Microsoft mode, a user-declared move only causes the deletion of the 4517 // corresponding copy operation, not both copy operations. 4518 if (RD->hasUserDeclaredMoveConstructor() && 4519 (!getLangOpts().MicrosoftMode || CSM == CXXCopyConstructor)) { 4520 if (!Diagnose) return true; 4521 UserDeclaredMove = RD->getMoveConstructor(); 4522 assert(UserDeclaredMove); 4523 } else if (RD->hasUserDeclaredMoveAssignment() && 4524 (!getLangOpts().MicrosoftMode || CSM == CXXCopyAssignment)) { 4525 if (!Diagnose) return true; 4526 UserDeclaredMove = RD->getMoveAssignmentOperator(); 4527 assert(UserDeclaredMove); 4528 } 4529 4530 if (UserDeclaredMove) { 4531 Diag(UserDeclaredMove->getLocation(), 4532 diag::note_deleted_copy_user_declared_move) 4533 << (CSM == CXXCopyAssignment) << RD 4534 << UserDeclaredMove->isMoveAssignmentOperator(); 4535 return true; 4536 } 4537 } 4538 4539 // Do access control from the special member function 4540 ContextRAII MethodContext(*this, MD); 4541 4542 // C++11 [class.dtor]p5: 4543 // -- for a virtual destructor, lookup of the non-array deallocation function 4544 // results in an ambiguity or in a function that is deleted or inaccessible 4545 if (CSM == CXXDestructor && MD->isVirtual()) { 4546 FunctionDecl *OperatorDelete = 0; 4547 DeclarationName Name = 4548 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 4549 if (FindDeallocationFunction(MD->getLocation(), MD->getParent(), Name, 4550 OperatorDelete, false)) { 4551 if (Diagnose) 4552 Diag(RD->getLocation(), diag::note_deleted_dtor_no_operator_delete); 4553 return true; 4554 } 4555 } 4556 4557 SpecialMemberDeletionInfo SMI(*this, MD, CSM, Diagnose); 4558 4559 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4560 BE = RD->bases_end(); BI != BE; ++BI) 4561 if (!BI->isVirtual() && 4562 SMI.shouldDeleteForBase(BI)) 4563 return true; 4564 4565 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 4566 BE = RD->vbases_end(); BI != BE; ++BI) 4567 if (SMI.shouldDeleteForBase(BI)) 4568 return true; 4569 4570 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4571 FE = RD->field_end(); FI != FE; ++FI) 4572 if (!FI->isInvalidDecl() && !FI->isUnnamedBitfield() && 4573 SMI.shouldDeleteForField(*FI)) 4574 return true; 4575 4576 if (SMI.shouldDeleteForAllConstMembers()) 4577 return true; 4578 4579 return false; 4580} 4581 4582/// \brief Data used with FindHiddenVirtualMethod 4583namespace { 4584 struct FindHiddenVirtualMethodData { 4585 Sema *S; 4586 CXXMethodDecl *Method; 4587 llvm::SmallPtrSet<const CXXMethodDecl *, 8> OverridenAndUsingBaseMethods; 4588 SmallVector<CXXMethodDecl *, 8> OverloadedMethods; 4589 }; 4590} 4591 4592/// \brief Member lookup function that determines whether a given C++ 4593/// method overloads virtual methods in a base class without overriding any, 4594/// to be used with CXXRecordDecl::lookupInBases(). 4595static bool FindHiddenVirtualMethod(const CXXBaseSpecifier *Specifier, 4596 CXXBasePath &Path, 4597 void *UserData) { 4598 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 4599 4600 FindHiddenVirtualMethodData &Data 4601 = *static_cast<FindHiddenVirtualMethodData*>(UserData); 4602 4603 DeclarationName Name = Data.Method->getDeclName(); 4604 assert(Name.getNameKind() == DeclarationName::Identifier); 4605 4606 bool foundSameNameMethod = false; 4607 SmallVector<CXXMethodDecl *, 8> overloadedMethods; 4608 for (Path.Decls = BaseRecord->lookup(Name); 4609 Path.Decls.first != Path.Decls.second; 4610 ++Path.Decls.first) { 4611 NamedDecl *D = *Path.Decls.first; 4612 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 4613 MD = MD->getCanonicalDecl(); 4614 foundSameNameMethod = true; 4615 // Interested only in hidden virtual methods. 4616 if (!MD->isVirtual()) 4617 continue; 4618 // If the method we are checking overrides a method from its base 4619 // don't warn about the other overloaded methods. 4620 if (!Data.S->IsOverload(Data.Method, MD, false)) 4621 return true; 4622 // Collect the overload only if its hidden. 4623 if (!Data.OverridenAndUsingBaseMethods.count(MD)) 4624 overloadedMethods.push_back(MD); 4625 } 4626 } 4627 4628 if (foundSameNameMethod) 4629 Data.OverloadedMethods.append(overloadedMethods.begin(), 4630 overloadedMethods.end()); 4631 return foundSameNameMethod; 4632} 4633 4634/// \brief See if a method overloads virtual methods in a base class without 4635/// overriding any. 4636void Sema::DiagnoseHiddenVirtualMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 4637 if (Diags.getDiagnosticLevel(diag::warn_overloaded_virtual, 4638 MD->getLocation()) == DiagnosticsEngine::Ignored) 4639 return; 4640 if (!MD->getDeclName().isIdentifier()) 4641 return; 4642 4643 CXXBasePaths Paths(/*FindAmbiguities=*/true, // true to look in all bases. 4644 /*bool RecordPaths=*/false, 4645 /*bool DetectVirtual=*/false); 4646 FindHiddenVirtualMethodData Data; 4647 Data.Method = MD; 4648 Data.S = this; 4649 4650 // Keep the base methods that were overriden or introduced in the subclass 4651 // by 'using' in a set. A base method not in this set is hidden. 4652 for (DeclContext::lookup_result res = DC->lookup(MD->getDeclName()); 4653 res.first != res.second; ++res.first) { 4654 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*res.first)) 4655 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 4656 E = MD->end_overridden_methods(); 4657 I != E; ++I) 4658 Data.OverridenAndUsingBaseMethods.insert((*I)->getCanonicalDecl()); 4659 if (UsingShadowDecl *shad = dyn_cast<UsingShadowDecl>(*res.first)) 4660 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(shad->getTargetDecl())) 4661 Data.OverridenAndUsingBaseMethods.insert(MD->getCanonicalDecl()); 4662 } 4663 4664 if (DC->lookupInBases(&FindHiddenVirtualMethod, &Data, Paths) && 4665 !Data.OverloadedMethods.empty()) { 4666 Diag(MD->getLocation(), diag::warn_overloaded_virtual) 4667 << MD << (Data.OverloadedMethods.size() > 1); 4668 4669 for (unsigned i = 0, e = Data.OverloadedMethods.size(); i != e; ++i) { 4670 CXXMethodDecl *overloadedMD = Data.OverloadedMethods[i]; 4671 Diag(overloadedMD->getLocation(), 4672 diag::note_hidden_overloaded_virtual_declared_here) << overloadedMD; 4673 } 4674 } 4675} 4676 4677void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 4678 Decl *TagDecl, 4679 SourceLocation LBrac, 4680 SourceLocation RBrac, 4681 AttributeList *AttrList) { 4682 if (!TagDecl) 4683 return; 4684 4685 AdjustDeclIfTemplate(TagDecl); 4686 4687 ActOnFields(S, RLoc, TagDecl, llvm::makeArrayRef( 4688 // strict aliasing violation! 4689 reinterpret_cast<Decl**>(FieldCollector->getCurFields()), 4690 FieldCollector->getCurNumFields()), LBrac, RBrac, AttrList); 4691 4692 CheckCompletedCXXClass( 4693 dyn_cast_or_null<CXXRecordDecl>(TagDecl)); 4694} 4695 4696/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 4697/// special functions, such as the default constructor, copy 4698/// constructor, or destructor, to the given C++ class (C++ 4699/// [special]p1). This routine can only be executed just before the 4700/// definition of the class is complete. 4701void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 4702 if (!ClassDecl->hasUserDeclaredConstructor()) 4703 ++ASTContext::NumImplicitDefaultConstructors; 4704 4705 if (!ClassDecl->hasUserDeclaredCopyConstructor()) 4706 ++ASTContext::NumImplicitCopyConstructors; 4707 4708 if (getLangOpts().CPlusPlus0x && ClassDecl->needsImplicitMoveConstructor()) 4709 ++ASTContext::NumImplicitMoveConstructors; 4710 4711 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 4712 ++ASTContext::NumImplicitCopyAssignmentOperators; 4713 4714 // If we have a dynamic class, then the copy assignment operator may be 4715 // virtual, so we have to declare it immediately. This ensures that, e.g., 4716 // it shows up in the right place in the vtable and that we diagnose 4717 // problems with the implicit exception specification. 4718 if (ClassDecl->isDynamicClass()) 4719 DeclareImplicitCopyAssignment(ClassDecl); 4720 } 4721 4722 if (getLangOpts().CPlusPlus0x && ClassDecl->needsImplicitMoveAssignment()) { 4723 ++ASTContext::NumImplicitMoveAssignmentOperators; 4724 4725 // Likewise for the move assignment operator. 4726 if (ClassDecl->isDynamicClass()) 4727 DeclareImplicitMoveAssignment(ClassDecl); 4728 } 4729 4730 if (!ClassDecl->hasUserDeclaredDestructor()) { 4731 ++ASTContext::NumImplicitDestructors; 4732 4733 // If we have a dynamic class, then the destructor may be virtual, so we 4734 // have to declare the destructor immediately. This ensures that, e.g., it 4735 // shows up in the right place in the vtable and that we diagnose problems 4736 // with the implicit exception specification. 4737 if (ClassDecl->isDynamicClass()) 4738 DeclareImplicitDestructor(ClassDecl); 4739 } 4740} 4741 4742void Sema::ActOnReenterDeclaratorTemplateScope(Scope *S, DeclaratorDecl *D) { 4743 if (!D) 4744 return; 4745 4746 int NumParamList = D->getNumTemplateParameterLists(); 4747 for (int i = 0; i < NumParamList; i++) { 4748 TemplateParameterList* Params = D->getTemplateParameterList(i); 4749 for (TemplateParameterList::iterator Param = Params->begin(), 4750 ParamEnd = Params->end(); 4751 Param != ParamEnd; ++Param) { 4752 NamedDecl *Named = cast<NamedDecl>(*Param); 4753 if (Named->getDeclName()) { 4754 S->AddDecl(Named); 4755 IdResolver.AddDecl(Named); 4756 } 4757 } 4758 } 4759} 4760 4761void Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) { 4762 if (!D) 4763 return; 4764 4765 TemplateParameterList *Params = 0; 4766 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 4767 Params = Template->getTemplateParameters(); 4768 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 4769 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 4770 Params = PartialSpec->getTemplateParameters(); 4771 else 4772 return; 4773 4774 for (TemplateParameterList::iterator Param = Params->begin(), 4775 ParamEnd = Params->end(); 4776 Param != ParamEnd; ++Param) { 4777 NamedDecl *Named = cast<NamedDecl>(*Param); 4778 if (Named->getDeclName()) { 4779 S->AddDecl(Named); 4780 IdResolver.AddDecl(Named); 4781 } 4782 } 4783} 4784 4785void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 4786 if (!RecordD) return; 4787 AdjustDeclIfTemplate(RecordD); 4788 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD); 4789 PushDeclContext(S, Record); 4790} 4791 4792void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 4793 if (!RecordD) return; 4794 PopDeclContext(); 4795} 4796 4797/// ActOnStartDelayedCXXMethodDeclaration - We have completed 4798/// parsing a top-level (non-nested) C++ class, and we are now 4799/// parsing those parts of the given Method declaration that could 4800/// not be parsed earlier (C++ [class.mem]p2), such as default 4801/// arguments. This action should enter the scope of the given 4802/// Method declaration as if we had just parsed the qualified method 4803/// name. However, it should not bring the parameters into scope; 4804/// that will be performed by ActOnDelayedCXXMethodParameter. 4805void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 4806} 4807 4808/// ActOnDelayedCXXMethodParameter - We've already started a delayed 4809/// C++ method declaration. We're (re-)introducing the given 4810/// function parameter into scope for use in parsing later parts of 4811/// the method declaration. For example, we could see an 4812/// ActOnParamDefaultArgument event for this parameter. 4813void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) { 4814 if (!ParamD) 4815 return; 4816 4817 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD); 4818 4819 // If this parameter has an unparsed default argument, clear it out 4820 // to make way for the parsed default argument. 4821 if (Param->hasUnparsedDefaultArg()) 4822 Param->setDefaultArg(0); 4823 4824 S->AddDecl(Param); 4825 if (Param->getDeclName()) 4826 IdResolver.AddDecl(Param); 4827} 4828 4829/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 4830/// processing the delayed method declaration for Method. The method 4831/// declaration is now considered finished. There may be a separate 4832/// ActOnStartOfFunctionDef action later (not necessarily 4833/// immediately!) for this method, if it was also defined inside the 4834/// class body. 4835void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 4836 if (!MethodD) 4837 return; 4838 4839 AdjustDeclIfTemplate(MethodD); 4840 4841 FunctionDecl *Method = cast<FunctionDecl>(MethodD); 4842 4843 // Now that we have our default arguments, check the constructor 4844 // again. It could produce additional diagnostics or affect whether 4845 // the class has implicitly-declared destructors, among other 4846 // things. 4847 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 4848 CheckConstructor(Constructor); 4849 4850 // Check the default arguments, which we may have added. 4851 if (!Method->isInvalidDecl()) 4852 CheckCXXDefaultArguments(Method); 4853} 4854 4855/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 4856/// the well-formedness of the constructor declarator @p D with type @p 4857/// R. If there are any errors in the declarator, this routine will 4858/// emit diagnostics and set the invalid bit to true. In any case, the type 4859/// will be updated to reflect a well-formed type for the constructor and 4860/// returned. 4861QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 4862 StorageClass &SC) { 4863 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 4864 4865 // C++ [class.ctor]p3: 4866 // A constructor shall not be virtual (10.3) or static (9.4). A 4867 // constructor can be invoked for a const, volatile or const 4868 // volatile object. A constructor shall not be declared const, 4869 // volatile, or const volatile (9.3.2). 4870 if (isVirtual) { 4871 if (!D.isInvalidType()) 4872 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 4873 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 4874 << SourceRange(D.getIdentifierLoc()); 4875 D.setInvalidType(); 4876 } 4877 if (SC == SC_Static) { 4878 if (!D.isInvalidType()) 4879 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 4880 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 4881 << SourceRange(D.getIdentifierLoc()); 4882 D.setInvalidType(); 4883 SC = SC_None; 4884 } 4885 4886 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 4887 if (FTI.TypeQuals != 0) { 4888 if (FTI.TypeQuals & Qualifiers::Const) 4889 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 4890 << "const" << SourceRange(D.getIdentifierLoc()); 4891 if (FTI.TypeQuals & Qualifiers::Volatile) 4892 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 4893 << "volatile" << SourceRange(D.getIdentifierLoc()); 4894 if (FTI.TypeQuals & Qualifiers::Restrict) 4895 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 4896 << "restrict" << SourceRange(D.getIdentifierLoc()); 4897 D.setInvalidType(); 4898 } 4899 4900 // C++0x [class.ctor]p4: 4901 // A constructor shall not be declared with a ref-qualifier. 4902 if (FTI.hasRefQualifier()) { 4903 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_constructor) 4904 << FTI.RefQualifierIsLValueRef 4905 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 4906 D.setInvalidType(); 4907 } 4908 4909 // Rebuild the function type "R" without any type qualifiers (in 4910 // case any of the errors above fired) and with "void" as the 4911 // return type, since constructors don't have return types. 4912 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 4913 if (Proto->getResultType() == Context.VoidTy && !D.isInvalidType()) 4914 return R; 4915 4916 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 4917 EPI.TypeQuals = 0; 4918 EPI.RefQualifier = RQ_None; 4919 4920 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 4921 Proto->getNumArgs(), EPI); 4922} 4923 4924/// CheckConstructor - Checks a fully-formed constructor for 4925/// well-formedness, issuing any diagnostics required. Returns true if 4926/// the constructor declarator is invalid. 4927void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 4928 CXXRecordDecl *ClassDecl 4929 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 4930 if (!ClassDecl) 4931 return Constructor->setInvalidDecl(); 4932 4933 // C++ [class.copy]p3: 4934 // A declaration of a constructor for a class X is ill-formed if 4935 // its first parameter is of type (optionally cv-qualified) X and 4936 // either there are no other parameters or else all other 4937 // parameters have default arguments. 4938 if (!Constructor->isInvalidDecl() && 4939 ((Constructor->getNumParams() == 1) || 4940 (Constructor->getNumParams() > 1 && 4941 Constructor->getParamDecl(1)->hasDefaultArg())) && 4942 Constructor->getTemplateSpecializationKind() 4943 != TSK_ImplicitInstantiation) { 4944 QualType ParamType = Constructor->getParamDecl(0)->getType(); 4945 QualType ClassTy = Context.getTagDeclType(ClassDecl); 4946 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 4947 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 4948 const char *ConstRef 4949 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 4950 : " const &"; 4951 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 4952 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 4953 4954 // FIXME: Rather that making the constructor invalid, we should endeavor 4955 // to fix the type. 4956 Constructor->setInvalidDecl(); 4957 } 4958 } 4959} 4960 4961/// CheckDestructor - Checks a fully-formed destructor definition for 4962/// well-formedness, issuing any diagnostics required. Returns true 4963/// on error. 4964bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 4965 CXXRecordDecl *RD = Destructor->getParent(); 4966 4967 if (Destructor->isVirtual()) { 4968 SourceLocation Loc; 4969 4970 if (!Destructor->isImplicit()) 4971 Loc = Destructor->getLocation(); 4972 else 4973 Loc = RD->getLocation(); 4974 4975 // If we have a virtual destructor, look up the deallocation function 4976 FunctionDecl *OperatorDelete = 0; 4977 DeclarationName Name = 4978 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 4979 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 4980 return true; 4981 4982 MarkFunctionReferenced(Loc, OperatorDelete); 4983 4984 Destructor->setOperatorDelete(OperatorDelete); 4985 } 4986 4987 return false; 4988} 4989 4990static inline bool 4991FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 4992 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 4993 FTI.ArgInfo[0].Param && 4994 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()); 4995} 4996 4997/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 4998/// the well-formednes of the destructor declarator @p D with type @p 4999/// R. If there are any errors in the declarator, this routine will 5000/// emit diagnostics and set the declarator to invalid. Even if this happens, 5001/// will be updated to reflect a well-formed type for the destructor and 5002/// returned. 5003QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, 5004 StorageClass& SC) { 5005 // C++ [class.dtor]p1: 5006 // [...] A typedef-name that names a class is a class-name 5007 // (7.1.3); however, a typedef-name that names a class shall not 5008 // be used as the identifier in the declarator for a destructor 5009 // declaration. 5010 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 5011 if (const TypedefType *TT = DeclaratorType->getAs<TypedefType>()) 5012 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 5013 << DeclaratorType << isa<TypeAliasDecl>(TT->getDecl()); 5014 else if (const TemplateSpecializationType *TST = 5015 DeclaratorType->getAs<TemplateSpecializationType>()) 5016 if (TST->isTypeAlias()) 5017 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 5018 << DeclaratorType << 1; 5019 5020 // C++ [class.dtor]p2: 5021 // A destructor is used to destroy objects of its class type. A 5022 // destructor takes no parameters, and no return type can be 5023 // specified for it (not even void). The address of a destructor 5024 // shall not be taken. A destructor shall not be static. A 5025 // destructor can be invoked for a const, volatile or const 5026 // volatile object. A destructor shall not be declared const, 5027 // volatile or const volatile (9.3.2). 5028 if (SC == SC_Static) { 5029 if (!D.isInvalidType()) 5030 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 5031 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5032 << SourceRange(D.getIdentifierLoc()) 5033 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 5034 5035 SC = SC_None; 5036 } 5037 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 5038 // Destructors don't have return types, but the parser will 5039 // happily parse something like: 5040 // 5041 // class X { 5042 // float ~X(); 5043 // }; 5044 // 5045 // The return type will be eliminated later. 5046 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 5047 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 5048 << SourceRange(D.getIdentifierLoc()); 5049 } 5050 5051 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5052 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 5053 if (FTI.TypeQuals & Qualifiers::Const) 5054 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5055 << "const" << SourceRange(D.getIdentifierLoc()); 5056 if (FTI.TypeQuals & Qualifiers::Volatile) 5057 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5058 << "volatile" << SourceRange(D.getIdentifierLoc()); 5059 if (FTI.TypeQuals & Qualifiers::Restrict) 5060 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5061 << "restrict" << SourceRange(D.getIdentifierLoc()); 5062 D.setInvalidType(); 5063 } 5064 5065 // C++0x [class.dtor]p2: 5066 // A destructor shall not be declared with a ref-qualifier. 5067 if (FTI.hasRefQualifier()) { 5068 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_destructor) 5069 << FTI.RefQualifierIsLValueRef 5070 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 5071 D.setInvalidType(); 5072 } 5073 5074 // Make sure we don't have any parameters. 5075 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 5076 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 5077 5078 // Delete the parameters. 5079 FTI.freeArgs(); 5080 D.setInvalidType(); 5081 } 5082 5083 // Make sure the destructor isn't variadic. 5084 if (FTI.isVariadic) { 5085 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 5086 D.setInvalidType(); 5087 } 5088 5089 // Rebuild the function type "R" without any type qualifiers or 5090 // parameters (in case any of the errors above fired) and with 5091 // "void" as the return type, since destructors don't have return 5092 // types. 5093 if (!D.isInvalidType()) 5094 return R; 5095 5096 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5097 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 5098 EPI.Variadic = false; 5099 EPI.TypeQuals = 0; 5100 EPI.RefQualifier = RQ_None; 5101 return Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 5102} 5103 5104/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 5105/// well-formednes of the conversion function declarator @p D with 5106/// type @p R. If there are any errors in the declarator, this routine 5107/// will emit diagnostics and return true. Otherwise, it will return 5108/// false. Either way, the type @p R will be updated to reflect a 5109/// well-formed type for the conversion operator. 5110void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 5111 StorageClass& SC) { 5112 // C++ [class.conv.fct]p1: 5113 // Neither parameter types nor return type can be specified. The 5114 // type of a conversion function (8.3.5) is "function taking no 5115 // parameter returning conversion-type-id." 5116 if (SC == SC_Static) { 5117 if (!D.isInvalidType()) 5118 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 5119 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5120 << SourceRange(D.getIdentifierLoc()); 5121 D.setInvalidType(); 5122 SC = SC_None; 5123 } 5124 5125 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 5126 5127 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 5128 // Conversion functions don't have return types, but the parser will 5129 // happily parse something like: 5130 // 5131 // class X { 5132 // float operator bool(); 5133 // }; 5134 // 5135 // The return type will be changed later anyway. 5136 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 5137 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 5138 << SourceRange(D.getIdentifierLoc()); 5139 D.setInvalidType(); 5140 } 5141 5142 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5143 5144 // Make sure we don't have any parameters. 5145 if (Proto->getNumArgs() > 0) { 5146 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 5147 5148 // Delete the parameters. 5149 D.getFunctionTypeInfo().freeArgs(); 5150 D.setInvalidType(); 5151 } else if (Proto->isVariadic()) { 5152 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 5153 D.setInvalidType(); 5154 } 5155 5156 // Diagnose "&operator bool()" and other such nonsense. This 5157 // is actually a gcc extension which we don't support. 5158 if (Proto->getResultType() != ConvType) { 5159 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 5160 << Proto->getResultType(); 5161 D.setInvalidType(); 5162 ConvType = Proto->getResultType(); 5163 } 5164 5165 // C++ [class.conv.fct]p4: 5166 // The conversion-type-id shall not represent a function type nor 5167 // an array type. 5168 if (ConvType->isArrayType()) { 5169 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 5170 ConvType = Context.getPointerType(ConvType); 5171 D.setInvalidType(); 5172 } else if (ConvType->isFunctionType()) { 5173 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 5174 ConvType = Context.getPointerType(ConvType); 5175 D.setInvalidType(); 5176 } 5177 5178 // Rebuild the function type "R" without any parameters (in case any 5179 // of the errors above fired) and with the conversion type as the 5180 // return type. 5181 if (D.isInvalidType()) 5182 R = Context.getFunctionType(ConvType, 0, 0, Proto->getExtProtoInfo()); 5183 5184 // C++0x explicit conversion operators. 5185 if (D.getDeclSpec().isExplicitSpecified()) 5186 Diag(D.getDeclSpec().getExplicitSpecLoc(), 5187 getLangOpts().CPlusPlus0x ? 5188 diag::warn_cxx98_compat_explicit_conversion_functions : 5189 diag::ext_explicit_conversion_functions) 5190 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 5191} 5192 5193/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 5194/// the declaration of the given C++ conversion function. This routine 5195/// is responsible for recording the conversion function in the C++ 5196/// class, if possible. 5197Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 5198 assert(Conversion && "Expected to receive a conversion function declaration"); 5199 5200 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 5201 5202 // Make sure we aren't redeclaring the conversion function. 5203 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 5204 5205 // C++ [class.conv.fct]p1: 5206 // [...] A conversion function is never used to convert a 5207 // (possibly cv-qualified) object to the (possibly cv-qualified) 5208 // same object type (or a reference to it), to a (possibly 5209 // cv-qualified) base class of that type (or a reference to it), 5210 // or to (possibly cv-qualified) void. 5211 // FIXME: Suppress this warning if the conversion function ends up being a 5212 // virtual function that overrides a virtual function in a base class. 5213 QualType ClassType 5214 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 5215 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 5216 ConvType = ConvTypeRef->getPointeeType(); 5217 if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared && 5218 Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) 5219 /* Suppress diagnostics for instantiations. */; 5220 else if (ConvType->isRecordType()) { 5221 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 5222 if (ConvType == ClassType) 5223 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 5224 << ClassType; 5225 else if (IsDerivedFrom(ClassType, ConvType)) 5226 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 5227 << ClassType << ConvType; 5228 } else if (ConvType->isVoidType()) { 5229 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 5230 << ClassType << ConvType; 5231 } 5232 5233 if (FunctionTemplateDecl *ConversionTemplate 5234 = Conversion->getDescribedFunctionTemplate()) 5235 return ConversionTemplate; 5236 5237 return Conversion; 5238} 5239 5240//===----------------------------------------------------------------------===// 5241// Namespace Handling 5242//===----------------------------------------------------------------------===// 5243 5244 5245 5246/// ActOnStartNamespaceDef - This is called at the start of a namespace 5247/// definition. 5248Decl *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 5249 SourceLocation InlineLoc, 5250 SourceLocation NamespaceLoc, 5251 SourceLocation IdentLoc, 5252 IdentifierInfo *II, 5253 SourceLocation LBrace, 5254 AttributeList *AttrList) { 5255 SourceLocation StartLoc = InlineLoc.isValid() ? InlineLoc : NamespaceLoc; 5256 // For anonymous namespace, take the location of the left brace. 5257 SourceLocation Loc = II ? IdentLoc : LBrace; 5258 bool IsInline = InlineLoc.isValid(); 5259 bool IsInvalid = false; 5260 bool IsStd = false; 5261 bool AddToKnown = false; 5262 Scope *DeclRegionScope = NamespcScope->getParent(); 5263 5264 NamespaceDecl *PrevNS = 0; 5265 if (II) { 5266 // C++ [namespace.def]p2: 5267 // The identifier in an original-namespace-definition shall not 5268 // have been previously defined in the declarative region in 5269 // which the original-namespace-definition appears. The 5270 // identifier in an original-namespace-definition is the name of 5271 // the namespace. Subsequently in that declarative region, it is 5272 // treated as an original-namespace-name. 5273 // 5274 // Since namespace names are unique in their scope, and we don't 5275 // look through using directives, just look for any ordinary names. 5276 5277 const unsigned IDNS = Decl::IDNS_Ordinary | Decl::IDNS_Member | 5278 Decl::IDNS_Type | Decl::IDNS_Using | Decl::IDNS_Tag | 5279 Decl::IDNS_Namespace; 5280 NamedDecl *PrevDecl = 0; 5281 for (DeclContext::lookup_result R 5282 = CurContext->getRedeclContext()->lookup(II); 5283 R.first != R.second; ++R.first) { 5284 if ((*R.first)->getIdentifierNamespace() & IDNS) { 5285 PrevDecl = *R.first; 5286 break; 5287 } 5288 } 5289 5290 PrevNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl); 5291 5292 if (PrevNS) { 5293 // This is an extended namespace definition. 5294 if (IsInline != PrevNS->isInline()) { 5295 // inline-ness must match 5296 if (PrevNS->isInline()) { 5297 // The user probably just forgot the 'inline', so suggest that it 5298 // be added back. 5299 Diag(Loc, diag::warn_inline_namespace_reopened_noninline) 5300 << FixItHint::CreateInsertion(NamespaceLoc, "inline "); 5301 } else { 5302 Diag(Loc, diag::err_inline_namespace_mismatch) 5303 << IsInline; 5304 } 5305 Diag(PrevNS->getLocation(), diag::note_previous_definition); 5306 5307 IsInline = PrevNS->isInline(); 5308 } 5309 } else if (PrevDecl) { 5310 // This is an invalid name redefinition. 5311 Diag(Loc, diag::err_redefinition_different_kind) 5312 << II; 5313 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 5314 IsInvalid = true; 5315 // Continue on to push Namespc as current DeclContext and return it. 5316 } else if (II->isStr("std") && 5317 CurContext->getRedeclContext()->isTranslationUnit()) { 5318 // This is the first "real" definition of the namespace "std", so update 5319 // our cache of the "std" namespace to point at this definition. 5320 PrevNS = getStdNamespace(); 5321 IsStd = true; 5322 AddToKnown = !IsInline; 5323 } else { 5324 // We've seen this namespace for the first time. 5325 AddToKnown = !IsInline; 5326 } 5327 } else { 5328 // Anonymous namespaces. 5329 5330 // Determine whether the parent already has an anonymous namespace. 5331 DeclContext *Parent = CurContext->getRedeclContext(); 5332 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 5333 PrevNS = TU->getAnonymousNamespace(); 5334 } else { 5335 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 5336 PrevNS = ND->getAnonymousNamespace(); 5337 } 5338 5339 if (PrevNS && IsInline != PrevNS->isInline()) { 5340 // inline-ness must match 5341 Diag(Loc, diag::err_inline_namespace_mismatch) 5342 << IsInline; 5343 Diag(PrevNS->getLocation(), diag::note_previous_definition); 5344 5345 // Recover by ignoring the new namespace's inline status. 5346 IsInline = PrevNS->isInline(); 5347 } 5348 } 5349 5350 NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, IsInline, 5351 StartLoc, Loc, II, PrevNS); 5352 if (IsInvalid) 5353 Namespc->setInvalidDecl(); 5354 5355 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 5356 5357 // FIXME: Should we be merging attributes? 5358 if (const VisibilityAttr *Attr = Namespc->getAttr<VisibilityAttr>()) 5359 PushNamespaceVisibilityAttr(Attr, Loc); 5360 5361 if (IsStd) 5362 StdNamespace = Namespc; 5363 if (AddToKnown) 5364 KnownNamespaces[Namespc] = false; 5365 5366 if (II) { 5367 PushOnScopeChains(Namespc, DeclRegionScope); 5368 } else { 5369 // Link the anonymous namespace into its parent. 5370 DeclContext *Parent = CurContext->getRedeclContext(); 5371 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 5372 TU->setAnonymousNamespace(Namespc); 5373 } else { 5374 cast<NamespaceDecl>(Parent)->setAnonymousNamespace(Namespc); 5375 } 5376 5377 CurContext->addDecl(Namespc); 5378 5379 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 5380 // behaves as if it were replaced by 5381 // namespace unique { /* empty body */ } 5382 // using namespace unique; 5383 // namespace unique { namespace-body } 5384 // where all occurrences of 'unique' in a translation unit are 5385 // replaced by the same identifier and this identifier differs 5386 // from all other identifiers in the entire program. 5387 5388 // We just create the namespace with an empty name and then add an 5389 // implicit using declaration, just like the standard suggests. 5390 // 5391 // CodeGen enforces the "universally unique" aspect by giving all 5392 // declarations semantically contained within an anonymous 5393 // namespace internal linkage. 5394 5395 if (!PrevNS) { 5396 UsingDirectiveDecl* UD 5397 = UsingDirectiveDecl::Create(Context, CurContext, 5398 /* 'using' */ LBrace, 5399 /* 'namespace' */ SourceLocation(), 5400 /* qualifier */ NestedNameSpecifierLoc(), 5401 /* identifier */ SourceLocation(), 5402 Namespc, 5403 /* Ancestor */ CurContext); 5404 UD->setImplicit(); 5405 CurContext->addDecl(UD); 5406 } 5407 } 5408 5409 // Although we could have an invalid decl (i.e. the namespace name is a 5410 // redefinition), push it as current DeclContext and try to continue parsing. 5411 // FIXME: We should be able to push Namespc here, so that the each DeclContext 5412 // for the namespace has the declarations that showed up in that particular 5413 // namespace definition. 5414 PushDeclContext(NamespcScope, Namespc); 5415 return Namespc; 5416} 5417 5418/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 5419/// is a namespace alias, returns the namespace it points to. 5420static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 5421 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 5422 return AD->getNamespace(); 5423 return dyn_cast_or_null<NamespaceDecl>(D); 5424} 5425 5426/// ActOnFinishNamespaceDef - This callback is called after a namespace is 5427/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 5428void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) { 5429 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 5430 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 5431 Namespc->setRBraceLoc(RBrace); 5432 PopDeclContext(); 5433 if (Namespc->hasAttr<VisibilityAttr>()) 5434 PopPragmaVisibility(true, RBrace); 5435} 5436 5437CXXRecordDecl *Sema::getStdBadAlloc() const { 5438 return cast_or_null<CXXRecordDecl>( 5439 StdBadAlloc.get(Context.getExternalSource())); 5440} 5441 5442NamespaceDecl *Sema::getStdNamespace() const { 5443 return cast_or_null<NamespaceDecl>( 5444 StdNamespace.get(Context.getExternalSource())); 5445} 5446 5447/// \brief Retrieve the special "std" namespace, which may require us to 5448/// implicitly define the namespace. 5449NamespaceDecl *Sema::getOrCreateStdNamespace() { 5450 if (!StdNamespace) { 5451 // The "std" namespace has not yet been defined, so build one implicitly. 5452 StdNamespace = NamespaceDecl::Create(Context, 5453 Context.getTranslationUnitDecl(), 5454 /*Inline=*/false, 5455 SourceLocation(), SourceLocation(), 5456 &PP.getIdentifierTable().get("std"), 5457 /*PrevDecl=*/0); 5458 getStdNamespace()->setImplicit(true); 5459 } 5460 5461 return getStdNamespace(); 5462} 5463 5464bool Sema::isStdInitializerList(QualType Ty, QualType *Element) { 5465 assert(getLangOpts().CPlusPlus && 5466 "Looking for std::initializer_list outside of C++."); 5467 5468 // We're looking for implicit instantiations of 5469 // template <typename E> class std::initializer_list. 5470 5471 if (!StdNamespace) // If we haven't seen namespace std yet, this can't be it. 5472 return false; 5473 5474 ClassTemplateDecl *Template = 0; 5475 const TemplateArgument *Arguments = 0; 5476 5477 if (const RecordType *RT = Ty->getAs<RecordType>()) { 5478 5479 ClassTemplateSpecializationDecl *Specialization = 5480 dyn_cast<ClassTemplateSpecializationDecl>(RT->getDecl()); 5481 if (!Specialization) 5482 return false; 5483 5484 Template = Specialization->getSpecializedTemplate(); 5485 Arguments = Specialization->getTemplateArgs().data(); 5486 } else if (const TemplateSpecializationType *TST = 5487 Ty->getAs<TemplateSpecializationType>()) { 5488 Template = dyn_cast_or_null<ClassTemplateDecl>( 5489 TST->getTemplateName().getAsTemplateDecl()); 5490 Arguments = TST->getArgs(); 5491 } 5492 if (!Template) 5493 return false; 5494 5495 if (!StdInitializerList) { 5496 // Haven't recognized std::initializer_list yet, maybe this is it. 5497 CXXRecordDecl *TemplateClass = Template->getTemplatedDecl(); 5498 if (TemplateClass->getIdentifier() != 5499 &PP.getIdentifierTable().get("initializer_list") || 5500 !getStdNamespace()->InEnclosingNamespaceSetOf( 5501 TemplateClass->getDeclContext())) 5502 return false; 5503 // This is a template called std::initializer_list, but is it the right 5504 // template? 5505 TemplateParameterList *Params = Template->getTemplateParameters(); 5506 if (Params->getMinRequiredArguments() != 1) 5507 return false; 5508 if (!isa<TemplateTypeParmDecl>(Params->getParam(0))) 5509 return false; 5510 5511 // It's the right template. 5512 StdInitializerList = Template; 5513 } 5514 5515 if (Template != StdInitializerList) 5516 return false; 5517 5518 // This is an instance of std::initializer_list. Find the argument type. 5519 if (Element) 5520 *Element = Arguments[0].getAsType(); 5521 return true; 5522} 5523 5524static ClassTemplateDecl *LookupStdInitializerList(Sema &S, SourceLocation Loc){ 5525 NamespaceDecl *Std = S.getStdNamespace(); 5526 if (!Std) { 5527 S.Diag(Loc, diag::err_implied_std_initializer_list_not_found); 5528 return 0; 5529 } 5530 5531 LookupResult Result(S, &S.PP.getIdentifierTable().get("initializer_list"), 5532 Loc, Sema::LookupOrdinaryName); 5533 if (!S.LookupQualifiedName(Result, Std)) { 5534 S.Diag(Loc, diag::err_implied_std_initializer_list_not_found); 5535 return 0; 5536 } 5537 ClassTemplateDecl *Template = Result.getAsSingle<ClassTemplateDecl>(); 5538 if (!Template) { 5539 Result.suppressDiagnostics(); 5540 // We found something weird. Complain about the first thing we found. 5541 NamedDecl *Found = *Result.begin(); 5542 S.Diag(Found->getLocation(), diag::err_malformed_std_initializer_list); 5543 return 0; 5544 } 5545 5546 // We found some template called std::initializer_list. Now verify that it's 5547 // correct. 5548 TemplateParameterList *Params = Template->getTemplateParameters(); 5549 if (Params->getMinRequiredArguments() != 1 || 5550 !isa<TemplateTypeParmDecl>(Params->getParam(0))) { 5551 S.Diag(Template->getLocation(), diag::err_malformed_std_initializer_list); 5552 return 0; 5553 } 5554 5555 return Template; 5556} 5557 5558QualType Sema::BuildStdInitializerList(QualType Element, SourceLocation Loc) { 5559 if (!StdInitializerList) { 5560 StdInitializerList = LookupStdInitializerList(*this, Loc); 5561 if (!StdInitializerList) 5562 return QualType(); 5563 } 5564 5565 TemplateArgumentListInfo Args(Loc, Loc); 5566 Args.addArgument(TemplateArgumentLoc(TemplateArgument(Element), 5567 Context.getTrivialTypeSourceInfo(Element, 5568 Loc))); 5569 return Context.getCanonicalType( 5570 CheckTemplateIdType(TemplateName(StdInitializerList), Loc, Args)); 5571} 5572 5573bool Sema::isInitListConstructor(const CXXConstructorDecl* Ctor) { 5574 // C++ [dcl.init.list]p2: 5575 // A constructor is an initializer-list constructor if its first parameter 5576 // is of type std::initializer_list<E> or reference to possibly cv-qualified 5577 // std::initializer_list<E> for some type E, and either there are no other 5578 // parameters or else all other parameters have default arguments. 5579 if (Ctor->getNumParams() < 1 || 5580 (Ctor->getNumParams() > 1 && !Ctor->getParamDecl(1)->hasDefaultArg())) 5581 return false; 5582 5583 QualType ArgType = Ctor->getParamDecl(0)->getType(); 5584 if (const ReferenceType *RT = ArgType->getAs<ReferenceType>()) 5585 ArgType = RT->getPointeeType().getUnqualifiedType(); 5586 5587 return isStdInitializerList(ArgType, 0); 5588} 5589 5590/// \brief Determine whether a using statement is in a context where it will be 5591/// apply in all contexts. 5592static bool IsUsingDirectiveInToplevelContext(DeclContext *CurContext) { 5593 switch (CurContext->getDeclKind()) { 5594 case Decl::TranslationUnit: 5595 return true; 5596 case Decl::LinkageSpec: 5597 return IsUsingDirectiveInToplevelContext(CurContext->getParent()); 5598 default: 5599 return false; 5600 } 5601} 5602 5603namespace { 5604 5605// Callback to only accept typo corrections that are namespaces. 5606class NamespaceValidatorCCC : public CorrectionCandidateCallback { 5607 public: 5608 virtual bool ValidateCandidate(const TypoCorrection &candidate) { 5609 if (NamedDecl *ND = candidate.getCorrectionDecl()) { 5610 return isa<NamespaceDecl>(ND) || isa<NamespaceAliasDecl>(ND); 5611 } 5612 return false; 5613 } 5614}; 5615 5616} 5617 5618static bool TryNamespaceTypoCorrection(Sema &S, LookupResult &R, Scope *Sc, 5619 CXXScopeSpec &SS, 5620 SourceLocation IdentLoc, 5621 IdentifierInfo *Ident) { 5622 NamespaceValidatorCCC Validator; 5623 R.clear(); 5624 if (TypoCorrection Corrected = S.CorrectTypo(R.getLookupNameInfo(), 5625 R.getLookupKind(), Sc, &SS, 5626 Validator)) { 5627 std::string CorrectedStr(Corrected.getAsString(S.getLangOpts())); 5628 std::string CorrectedQuotedStr(Corrected.getQuoted(S.getLangOpts())); 5629 if (DeclContext *DC = S.computeDeclContext(SS, false)) 5630 S.Diag(IdentLoc, diag::err_using_directive_member_suggest) 5631 << Ident << DC << CorrectedQuotedStr << SS.getRange() 5632 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr); 5633 else 5634 S.Diag(IdentLoc, diag::err_using_directive_suggest) 5635 << Ident << CorrectedQuotedStr 5636 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr); 5637 5638 S.Diag(Corrected.getCorrectionDecl()->getLocation(), 5639 diag::note_namespace_defined_here) << CorrectedQuotedStr; 5640 5641 R.addDecl(Corrected.getCorrectionDecl()); 5642 return true; 5643 } 5644 return false; 5645} 5646 5647Decl *Sema::ActOnUsingDirective(Scope *S, 5648 SourceLocation UsingLoc, 5649 SourceLocation NamespcLoc, 5650 CXXScopeSpec &SS, 5651 SourceLocation IdentLoc, 5652 IdentifierInfo *NamespcName, 5653 AttributeList *AttrList) { 5654 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 5655 assert(NamespcName && "Invalid NamespcName."); 5656 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 5657 5658 // This can only happen along a recovery path. 5659 while (S->getFlags() & Scope::TemplateParamScope) 5660 S = S->getParent(); 5661 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 5662 5663 UsingDirectiveDecl *UDir = 0; 5664 NestedNameSpecifier *Qualifier = 0; 5665 if (SS.isSet()) 5666 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 5667 5668 // Lookup namespace name. 5669 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 5670 LookupParsedName(R, S, &SS); 5671 if (R.isAmbiguous()) 5672 return 0; 5673 5674 if (R.empty()) { 5675 R.clear(); 5676 // Allow "using namespace std;" or "using namespace ::std;" even if 5677 // "std" hasn't been defined yet, for GCC compatibility. 5678 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 5679 NamespcName->isStr("std")) { 5680 Diag(IdentLoc, diag::ext_using_undefined_std); 5681 R.addDecl(getOrCreateStdNamespace()); 5682 R.resolveKind(); 5683 } 5684 // Otherwise, attempt typo correction. 5685 else TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, NamespcName); 5686 } 5687 5688 if (!R.empty()) { 5689 NamedDecl *Named = R.getFoundDecl(); 5690 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 5691 && "expected namespace decl"); 5692 // C++ [namespace.udir]p1: 5693 // A using-directive specifies that the names in the nominated 5694 // namespace can be used in the scope in which the 5695 // using-directive appears after the using-directive. During 5696 // unqualified name lookup (3.4.1), the names appear as if they 5697 // were declared in the nearest enclosing namespace which 5698 // contains both the using-directive and the nominated 5699 // namespace. [Note: in this context, "contains" means "contains 5700 // directly or indirectly". ] 5701 5702 // Find enclosing context containing both using-directive and 5703 // nominated namespace. 5704 NamespaceDecl *NS = getNamespaceDecl(Named); 5705 DeclContext *CommonAncestor = cast<DeclContext>(NS); 5706 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 5707 CommonAncestor = CommonAncestor->getParent(); 5708 5709 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 5710 SS.getWithLocInContext(Context), 5711 IdentLoc, Named, CommonAncestor); 5712 5713 if (IsUsingDirectiveInToplevelContext(CurContext) && 5714 !SourceMgr.isFromMainFile(SourceMgr.getExpansionLoc(IdentLoc))) { 5715 Diag(IdentLoc, diag::warn_using_directive_in_header); 5716 } 5717 5718 PushUsingDirective(S, UDir); 5719 } else { 5720 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 5721 } 5722 5723 // FIXME: We ignore attributes for now. 5724 return UDir; 5725} 5726 5727void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 5728 // If the scope has an associated entity and the using directive is at 5729 // namespace or translation unit scope, add the UsingDirectiveDecl into 5730 // its lookup structure so qualified name lookup can find it. 5731 DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity()); 5732 if (Ctx && !Ctx->isFunctionOrMethod()) 5733 Ctx->addDecl(UDir); 5734 else 5735 // Otherwise, it is at block sope. The using-directives will affect lookup 5736 // only to the end of the scope. 5737 S->PushUsingDirective(UDir); 5738} 5739 5740 5741Decl *Sema::ActOnUsingDeclaration(Scope *S, 5742 AccessSpecifier AS, 5743 bool HasUsingKeyword, 5744 SourceLocation UsingLoc, 5745 CXXScopeSpec &SS, 5746 UnqualifiedId &Name, 5747 AttributeList *AttrList, 5748 bool IsTypeName, 5749 SourceLocation TypenameLoc) { 5750 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 5751 5752 switch (Name.getKind()) { 5753 case UnqualifiedId::IK_ImplicitSelfParam: 5754 case UnqualifiedId::IK_Identifier: 5755 case UnqualifiedId::IK_OperatorFunctionId: 5756 case UnqualifiedId::IK_LiteralOperatorId: 5757 case UnqualifiedId::IK_ConversionFunctionId: 5758 break; 5759 5760 case UnqualifiedId::IK_ConstructorName: 5761 case UnqualifiedId::IK_ConstructorTemplateId: 5762 // C++11 inheriting constructors. 5763 Diag(Name.getLocStart(), 5764 getLangOpts().CPlusPlus0x ? 5765 // FIXME: Produce warn_cxx98_compat_using_decl_constructor 5766 // instead once inheriting constructors work. 5767 diag::err_using_decl_constructor_unsupported : 5768 diag::err_using_decl_constructor) 5769 << SS.getRange(); 5770 5771 if (getLangOpts().CPlusPlus0x) break; 5772 5773 return 0; 5774 5775 case UnqualifiedId::IK_DestructorName: 5776 Diag(Name.getLocStart(), diag::err_using_decl_destructor) 5777 << SS.getRange(); 5778 return 0; 5779 5780 case UnqualifiedId::IK_TemplateId: 5781 Diag(Name.getLocStart(), diag::err_using_decl_template_id) 5782 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 5783 return 0; 5784 } 5785 5786 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name); 5787 DeclarationName TargetName = TargetNameInfo.getName(); 5788 if (!TargetName) 5789 return 0; 5790 5791 // Warn about using declarations. 5792 // TODO: store that the declaration was written without 'using' and 5793 // talk about access decls instead of using decls in the 5794 // diagnostics. 5795 if (!HasUsingKeyword) { 5796 UsingLoc = Name.getLocStart(); 5797 5798 Diag(UsingLoc, diag::warn_access_decl_deprecated) 5799 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 5800 } 5801 5802 if (DiagnoseUnexpandedParameterPack(SS, UPPC_UsingDeclaration) || 5803 DiagnoseUnexpandedParameterPack(TargetNameInfo, UPPC_UsingDeclaration)) 5804 return 0; 5805 5806 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 5807 TargetNameInfo, AttrList, 5808 /* IsInstantiation */ false, 5809 IsTypeName, TypenameLoc); 5810 if (UD) 5811 PushOnScopeChains(UD, S, /*AddToContext*/ false); 5812 5813 return UD; 5814} 5815 5816/// \brief Determine whether a using declaration considers the given 5817/// declarations as "equivalent", e.g., if they are redeclarations of 5818/// the same entity or are both typedefs of the same type. 5819static bool 5820IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2, 5821 bool &SuppressRedeclaration) { 5822 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) { 5823 SuppressRedeclaration = false; 5824 return true; 5825 } 5826 5827 if (TypedefNameDecl *TD1 = dyn_cast<TypedefNameDecl>(D1)) 5828 if (TypedefNameDecl *TD2 = dyn_cast<TypedefNameDecl>(D2)) { 5829 SuppressRedeclaration = true; 5830 return Context.hasSameType(TD1->getUnderlyingType(), 5831 TD2->getUnderlyingType()); 5832 } 5833 5834 return false; 5835} 5836 5837 5838/// Determines whether to create a using shadow decl for a particular 5839/// decl, given the set of decls existing prior to this using lookup. 5840bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 5841 const LookupResult &Previous) { 5842 // Diagnose finding a decl which is not from a base class of the 5843 // current class. We do this now because there are cases where this 5844 // function will silently decide not to build a shadow decl, which 5845 // will pre-empt further diagnostics. 5846 // 5847 // We don't need to do this in C++0x because we do the check once on 5848 // the qualifier. 5849 // 5850 // FIXME: diagnose the following if we care enough: 5851 // struct A { int foo; }; 5852 // struct B : A { using A::foo; }; 5853 // template <class T> struct C : A {}; 5854 // template <class T> struct D : C<T> { using B::foo; } // <--- 5855 // This is invalid (during instantiation) in C++03 because B::foo 5856 // resolves to the using decl in B, which is not a base class of D<T>. 5857 // We can't diagnose it immediately because C<T> is an unknown 5858 // specialization. The UsingShadowDecl in D<T> then points directly 5859 // to A::foo, which will look well-formed when we instantiate. 5860 // The right solution is to not collapse the shadow-decl chain. 5861 if (!getLangOpts().CPlusPlus0x && CurContext->isRecord()) { 5862 DeclContext *OrigDC = Orig->getDeclContext(); 5863 5864 // Handle enums and anonymous structs. 5865 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 5866 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 5867 while (OrigRec->isAnonymousStructOrUnion()) 5868 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 5869 5870 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 5871 if (OrigDC == CurContext) { 5872 Diag(Using->getLocation(), 5873 diag::err_using_decl_nested_name_specifier_is_current_class) 5874 << Using->getQualifierLoc().getSourceRange(); 5875 Diag(Orig->getLocation(), diag::note_using_decl_target); 5876 return true; 5877 } 5878 5879 Diag(Using->getQualifierLoc().getBeginLoc(), 5880 diag::err_using_decl_nested_name_specifier_is_not_base_class) 5881 << Using->getQualifier() 5882 << cast<CXXRecordDecl>(CurContext) 5883 << Using->getQualifierLoc().getSourceRange(); 5884 Diag(Orig->getLocation(), diag::note_using_decl_target); 5885 return true; 5886 } 5887 } 5888 5889 if (Previous.empty()) return false; 5890 5891 NamedDecl *Target = Orig; 5892 if (isa<UsingShadowDecl>(Target)) 5893 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 5894 5895 // If the target happens to be one of the previous declarations, we 5896 // don't have a conflict. 5897 // 5898 // FIXME: but we might be increasing its access, in which case we 5899 // should redeclare it. 5900 NamedDecl *NonTag = 0, *Tag = 0; 5901 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 5902 I != E; ++I) { 5903 NamedDecl *D = (*I)->getUnderlyingDecl(); 5904 bool Result; 5905 if (IsEquivalentForUsingDecl(Context, D, Target, Result)) 5906 return Result; 5907 5908 (isa<TagDecl>(D) ? Tag : NonTag) = D; 5909 } 5910 5911 if (Target->isFunctionOrFunctionTemplate()) { 5912 FunctionDecl *FD; 5913 if (isa<FunctionTemplateDecl>(Target)) 5914 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 5915 else 5916 FD = cast<FunctionDecl>(Target); 5917 5918 NamedDecl *OldDecl = 0; 5919 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 5920 case Ovl_Overload: 5921 return false; 5922 5923 case Ovl_NonFunction: 5924 Diag(Using->getLocation(), diag::err_using_decl_conflict); 5925 break; 5926 5927 // We found a decl with the exact signature. 5928 case Ovl_Match: 5929 // If we're in a record, we want to hide the target, so we 5930 // return true (without a diagnostic) to tell the caller not to 5931 // build a shadow decl. 5932 if (CurContext->isRecord()) 5933 return true; 5934 5935 // If we're not in a record, this is an error. 5936 Diag(Using->getLocation(), diag::err_using_decl_conflict); 5937 break; 5938 } 5939 5940 Diag(Target->getLocation(), diag::note_using_decl_target); 5941 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 5942 return true; 5943 } 5944 5945 // Target is not a function. 5946 5947 if (isa<TagDecl>(Target)) { 5948 // No conflict between a tag and a non-tag. 5949 if (!Tag) return false; 5950 5951 Diag(Using->getLocation(), diag::err_using_decl_conflict); 5952 Diag(Target->getLocation(), diag::note_using_decl_target); 5953 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 5954 return true; 5955 } 5956 5957 // No conflict between a tag and a non-tag. 5958 if (!NonTag) return false; 5959 5960 Diag(Using->getLocation(), diag::err_using_decl_conflict); 5961 Diag(Target->getLocation(), diag::note_using_decl_target); 5962 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 5963 return true; 5964} 5965 5966/// Builds a shadow declaration corresponding to a 'using' declaration. 5967UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 5968 UsingDecl *UD, 5969 NamedDecl *Orig) { 5970 5971 // If we resolved to another shadow declaration, just coalesce them. 5972 NamedDecl *Target = Orig; 5973 if (isa<UsingShadowDecl>(Target)) { 5974 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 5975 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 5976 } 5977 5978 UsingShadowDecl *Shadow 5979 = UsingShadowDecl::Create(Context, CurContext, 5980 UD->getLocation(), UD, Target); 5981 UD->addShadowDecl(Shadow); 5982 5983 Shadow->setAccess(UD->getAccess()); 5984 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 5985 Shadow->setInvalidDecl(); 5986 5987 if (S) 5988 PushOnScopeChains(Shadow, S); 5989 else 5990 CurContext->addDecl(Shadow); 5991 5992 5993 return Shadow; 5994} 5995 5996/// Hides a using shadow declaration. This is required by the current 5997/// using-decl implementation when a resolvable using declaration in a 5998/// class is followed by a declaration which would hide or override 5999/// one or more of the using decl's targets; for example: 6000/// 6001/// struct Base { void foo(int); }; 6002/// struct Derived : Base { 6003/// using Base::foo; 6004/// void foo(int); 6005/// }; 6006/// 6007/// The governing language is C++03 [namespace.udecl]p12: 6008/// 6009/// When a using-declaration brings names from a base class into a 6010/// derived class scope, member functions in the derived class 6011/// override and/or hide member functions with the same name and 6012/// parameter types in a base class (rather than conflicting). 6013/// 6014/// There are two ways to implement this: 6015/// (1) optimistically create shadow decls when they're not hidden 6016/// by existing declarations, or 6017/// (2) don't create any shadow decls (or at least don't make them 6018/// visible) until we've fully parsed/instantiated the class. 6019/// The problem with (1) is that we might have to retroactively remove 6020/// a shadow decl, which requires several O(n) operations because the 6021/// decl structures are (very reasonably) not designed for removal. 6022/// (2) avoids this but is very fiddly and phase-dependent. 6023void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 6024 if (Shadow->getDeclName().getNameKind() == 6025 DeclarationName::CXXConversionFunctionName) 6026 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 6027 6028 // Remove it from the DeclContext... 6029 Shadow->getDeclContext()->removeDecl(Shadow); 6030 6031 // ...and the scope, if applicable... 6032 if (S) { 6033 S->RemoveDecl(Shadow); 6034 IdResolver.RemoveDecl(Shadow); 6035 } 6036 6037 // ...and the using decl. 6038 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 6039 6040 // TODO: complain somehow if Shadow was used. It shouldn't 6041 // be possible for this to happen, because...? 6042} 6043 6044/// Builds a using declaration. 6045/// 6046/// \param IsInstantiation - Whether this call arises from an 6047/// instantiation of an unresolved using declaration. We treat 6048/// the lookup differently for these declarations. 6049NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 6050 SourceLocation UsingLoc, 6051 CXXScopeSpec &SS, 6052 const DeclarationNameInfo &NameInfo, 6053 AttributeList *AttrList, 6054 bool IsInstantiation, 6055 bool IsTypeName, 6056 SourceLocation TypenameLoc) { 6057 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 6058 SourceLocation IdentLoc = NameInfo.getLoc(); 6059 assert(IdentLoc.isValid() && "Invalid TargetName location."); 6060 6061 // FIXME: We ignore attributes for now. 6062 6063 if (SS.isEmpty()) { 6064 Diag(IdentLoc, diag::err_using_requires_qualname); 6065 return 0; 6066 } 6067 6068 // Do the redeclaration lookup in the current scope. 6069 LookupResult Previous(*this, NameInfo, LookupUsingDeclName, 6070 ForRedeclaration); 6071 Previous.setHideTags(false); 6072 if (S) { 6073 LookupName(Previous, S); 6074 6075 // It is really dumb that we have to do this. 6076 LookupResult::Filter F = Previous.makeFilter(); 6077 while (F.hasNext()) { 6078 NamedDecl *D = F.next(); 6079 if (!isDeclInScope(D, CurContext, S)) 6080 F.erase(); 6081 } 6082 F.done(); 6083 } else { 6084 assert(IsInstantiation && "no scope in non-instantiation"); 6085 assert(CurContext->isRecord() && "scope not record in instantiation"); 6086 LookupQualifiedName(Previous, CurContext); 6087 } 6088 6089 // Check for invalid redeclarations. 6090 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 6091 return 0; 6092 6093 // Check for bad qualifiers. 6094 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 6095 return 0; 6096 6097 DeclContext *LookupContext = computeDeclContext(SS); 6098 NamedDecl *D; 6099 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 6100 if (!LookupContext) { 6101 if (IsTypeName) { 6102 // FIXME: not all declaration name kinds are legal here 6103 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 6104 UsingLoc, TypenameLoc, 6105 QualifierLoc, 6106 IdentLoc, NameInfo.getName()); 6107 } else { 6108 D = UnresolvedUsingValueDecl::Create(Context, CurContext, UsingLoc, 6109 QualifierLoc, NameInfo); 6110 } 6111 } else { 6112 D = UsingDecl::Create(Context, CurContext, UsingLoc, QualifierLoc, 6113 NameInfo, IsTypeName); 6114 } 6115 D->setAccess(AS); 6116 CurContext->addDecl(D); 6117 6118 if (!LookupContext) return D; 6119 UsingDecl *UD = cast<UsingDecl>(D); 6120 6121 if (RequireCompleteDeclContext(SS, LookupContext)) { 6122 UD->setInvalidDecl(); 6123 return UD; 6124 } 6125 6126 // The normal rules do not apply to inheriting constructor declarations. 6127 if (NameInfo.getName().getNameKind() == DeclarationName::CXXConstructorName) { 6128 if (CheckInheritingConstructorUsingDecl(UD)) 6129 UD->setInvalidDecl(); 6130 return UD; 6131 } 6132 6133 // Otherwise, look up the target name. 6134 6135 LookupResult R(*this, NameInfo, LookupOrdinaryName); 6136 6137 // Unlike most lookups, we don't always want to hide tag 6138 // declarations: tag names are visible through the using declaration 6139 // even if hidden by ordinary names, *except* in a dependent context 6140 // where it's important for the sanity of two-phase lookup. 6141 if (!IsInstantiation) 6142 R.setHideTags(false); 6143 6144 // For the purposes of this lookup, we have a base object type 6145 // equal to that of the current context. 6146 if (CurContext->isRecord()) { 6147 R.setBaseObjectType( 6148 Context.getTypeDeclType(cast<CXXRecordDecl>(CurContext))); 6149 } 6150 6151 LookupQualifiedName(R, LookupContext); 6152 6153 if (R.empty()) { 6154 Diag(IdentLoc, diag::err_no_member) 6155 << NameInfo.getName() << LookupContext << SS.getRange(); 6156 UD->setInvalidDecl(); 6157 return UD; 6158 } 6159 6160 if (R.isAmbiguous()) { 6161 UD->setInvalidDecl(); 6162 return UD; 6163 } 6164 6165 if (IsTypeName) { 6166 // If we asked for a typename and got a non-type decl, error out. 6167 if (!R.getAsSingle<TypeDecl>()) { 6168 Diag(IdentLoc, diag::err_using_typename_non_type); 6169 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 6170 Diag((*I)->getUnderlyingDecl()->getLocation(), 6171 diag::note_using_decl_target); 6172 UD->setInvalidDecl(); 6173 return UD; 6174 } 6175 } else { 6176 // If we asked for a non-typename and we got a type, error out, 6177 // but only if this is an instantiation of an unresolved using 6178 // decl. Otherwise just silently find the type name. 6179 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 6180 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 6181 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 6182 UD->setInvalidDecl(); 6183 return UD; 6184 } 6185 } 6186 6187 // C++0x N2914 [namespace.udecl]p6: 6188 // A using-declaration shall not name a namespace. 6189 if (R.getAsSingle<NamespaceDecl>()) { 6190 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 6191 << SS.getRange(); 6192 UD->setInvalidDecl(); 6193 return UD; 6194 } 6195 6196 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 6197 if (!CheckUsingShadowDecl(UD, *I, Previous)) 6198 BuildUsingShadowDecl(S, UD, *I); 6199 } 6200 6201 return UD; 6202} 6203 6204/// Additional checks for a using declaration referring to a constructor name. 6205bool Sema::CheckInheritingConstructorUsingDecl(UsingDecl *UD) { 6206 assert(!UD->isTypeName() && "expecting a constructor name"); 6207 6208 const Type *SourceType = UD->getQualifier()->getAsType(); 6209 assert(SourceType && 6210 "Using decl naming constructor doesn't have type in scope spec."); 6211 CXXRecordDecl *TargetClass = cast<CXXRecordDecl>(CurContext); 6212 6213 // Check whether the named type is a direct base class. 6214 CanQualType CanonicalSourceType = SourceType->getCanonicalTypeUnqualified(); 6215 CXXRecordDecl::base_class_iterator BaseIt, BaseE; 6216 for (BaseIt = TargetClass->bases_begin(), BaseE = TargetClass->bases_end(); 6217 BaseIt != BaseE; ++BaseIt) { 6218 CanQualType BaseType = BaseIt->getType()->getCanonicalTypeUnqualified(); 6219 if (CanonicalSourceType == BaseType) 6220 break; 6221 if (BaseIt->getType()->isDependentType()) 6222 break; 6223 } 6224 6225 if (BaseIt == BaseE) { 6226 // Did not find SourceType in the bases. 6227 Diag(UD->getUsingLocation(), 6228 diag::err_using_decl_constructor_not_in_direct_base) 6229 << UD->getNameInfo().getSourceRange() 6230 << QualType(SourceType, 0) << TargetClass; 6231 return true; 6232 } 6233 6234 if (!CurContext->isDependentContext()) 6235 BaseIt->setInheritConstructors(); 6236 6237 return false; 6238} 6239 6240/// Checks that the given using declaration is not an invalid 6241/// redeclaration. Note that this is checking only for the using decl 6242/// itself, not for any ill-formedness among the UsingShadowDecls. 6243bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 6244 bool isTypeName, 6245 const CXXScopeSpec &SS, 6246 SourceLocation NameLoc, 6247 const LookupResult &Prev) { 6248 // C++03 [namespace.udecl]p8: 6249 // C++0x [namespace.udecl]p10: 6250 // A using-declaration is a declaration and can therefore be used 6251 // repeatedly where (and only where) multiple declarations are 6252 // allowed. 6253 // 6254 // That's in non-member contexts. 6255 if (!CurContext->getRedeclContext()->isRecord()) 6256 return false; 6257 6258 NestedNameSpecifier *Qual 6259 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 6260 6261 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 6262 NamedDecl *D = *I; 6263 6264 bool DTypename; 6265 NestedNameSpecifier *DQual; 6266 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 6267 DTypename = UD->isTypeName(); 6268 DQual = UD->getQualifier(); 6269 } else if (UnresolvedUsingValueDecl *UD 6270 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 6271 DTypename = false; 6272 DQual = UD->getQualifier(); 6273 } else if (UnresolvedUsingTypenameDecl *UD 6274 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 6275 DTypename = true; 6276 DQual = UD->getQualifier(); 6277 } else continue; 6278 6279 // using decls differ if one says 'typename' and the other doesn't. 6280 // FIXME: non-dependent using decls? 6281 if (isTypeName != DTypename) continue; 6282 6283 // using decls differ if they name different scopes (but note that 6284 // template instantiation can cause this check to trigger when it 6285 // didn't before instantiation). 6286 if (Context.getCanonicalNestedNameSpecifier(Qual) != 6287 Context.getCanonicalNestedNameSpecifier(DQual)) 6288 continue; 6289 6290 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 6291 Diag(D->getLocation(), diag::note_using_decl) << 1; 6292 return true; 6293 } 6294 6295 return false; 6296} 6297 6298 6299/// Checks that the given nested-name qualifier used in a using decl 6300/// in the current context is appropriately related to the current 6301/// scope. If an error is found, diagnoses it and returns true. 6302bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 6303 const CXXScopeSpec &SS, 6304 SourceLocation NameLoc) { 6305 DeclContext *NamedContext = computeDeclContext(SS); 6306 6307 if (!CurContext->isRecord()) { 6308 // C++03 [namespace.udecl]p3: 6309 // C++0x [namespace.udecl]p8: 6310 // A using-declaration for a class member shall be a member-declaration. 6311 6312 // If we weren't able to compute a valid scope, it must be a 6313 // dependent class scope. 6314 if (!NamedContext || NamedContext->isRecord()) { 6315 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 6316 << SS.getRange(); 6317 return true; 6318 } 6319 6320 // Otherwise, everything is known to be fine. 6321 return false; 6322 } 6323 6324 // The current scope is a record. 6325 6326 // If the named context is dependent, we can't decide much. 6327 if (!NamedContext) { 6328 // FIXME: in C++0x, we can diagnose if we can prove that the 6329 // nested-name-specifier does not refer to a base class, which is 6330 // still possible in some cases. 6331 6332 // Otherwise we have to conservatively report that things might be 6333 // okay. 6334 return false; 6335 } 6336 6337 if (!NamedContext->isRecord()) { 6338 // Ideally this would point at the last name in the specifier, 6339 // but we don't have that level of source info. 6340 Diag(SS.getRange().getBegin(), 6341 diag::err_using_decl_nested_name_specifier_is_not_class) 6342 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 6343 return true; 6344 } 6345 6346 if (!NamedContext->isDependentContext() && 6347 RequireCompleteDeclContext(const_cast<CXXScopeSpec&>(SS), NamedContext)) 6348 return true; 6349 6350 if (getLangOpts().CPlusPlus0x) { 6351 // C++0x [namespace.udecl]p3: 6352 // In a using-declaration used as a member-declaration, the 6353 // nested-name-specifier shall name a base class of the class 6354 // being defined. 6355 6356 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 6357 cast<CXXRecordDecl>(NamedContext))) { 6358 if (CurContext == NamedContext) { 6359 Diag(NameLoc, 6360 diag::err_using_decl_nested_name_specifier_is_current_class) 6361 << SS.getRange(); 6362 return true; 6363 } 6364 6365 Diag(SS.getRange().getBegin(), 6366 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6367 << (NestedNameSpecifier*) SS.getScopeRep() 6368 << cast<CXXRecordDecl>(CurContext) 6369 << SS.getRange(); 6370 return true; 6371 } 6372 6373 return false; 6374 } 6375 6376 // C++03 [namespace.udecl]p4: 6377 // A using-declaration used as a member-declaration shall refer 6378 // to a member of a base class of the class being defined [etc.]. 6379 6380 // Salient point: SS doesn't have to name a base class as long as 6381 // lookup only finds members from base classes. Therefore we can 6382 // diagnose here only if we can prove that that can't happen, 6383 // i.e. if the class hierarchies provably don't intersect. 6384 6385 // TODO: it would be nice if "definitely valid" results were cached 6386 // in the UsingDecl and UsingShadowDecl so that these checks didn't 6387 // need to be repeated. 6388 6389 struct UserData { 6390 llvm::SmallPtrSet<const CXXRecordDecl*, 4> Bases; 6391 6392 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 6393 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 6394 Data->Bases.insert(Base); 6395 return true; 6396 } 6397 6398 bool hasDependentBases(const CXXRecordDecl *Class) { 6399 return !Class->forallBases(collect, this); 6400 } 6401 6402 /// Returns true if the base is dependent or is one of the 6403 /// accumulated base classes. 6404 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 6405 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 6406 return !Data->Bases.count(Base); 6407 } 6408 6409 bool mightShareBases(const CXXRecordDecl *Class) { 6410 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 6411 } 6412 }; 6413 6414 UserData Data; 6415 6416 // Returns false if we find a dependent base. 6417 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 6418 return false; 6419 6420 // Returns false if the class has a dependent base or if it or one 6421 // of its bases is present in the base set of the current context. 6422 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 6423 return false; 6424 6425 Diag(SS.getRange().getBegin(), 6426 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6427 << (NestedNameSpecifier*) SS.getScopeRep() 6428 << cast<CXXRecordDecl>(CurContext) 6429 << SS.getRange(); 6430 6431 return true; 6432} 6433 6434Decl *Sema::ActOnAliasDeclaration(Scope *S, 6435 AccessSpecifier AS, 6436 MultiTemplateParamsArg TemplateParamLists, 6437 SourceLocation UsingLoc, 6438 UnqualifiedId &Name, 6439 TypeResult Type) { 6440 // Skip up to the relevant declaration scope. 6441 while (S->getFlags() & Scope::TemplateParamScope) 6442 S = S->getParent(); 6443 assert((S->getFlags() & Scope::DeclScope) && 6444 "got alias-declaration outside of declaration scope"); 6445 6446 if (Type.isInvalid()) 6447 return 0; 6448 6449 bool Invalid = false; 6450 DeclarationNameInfo NameInfo = GetNameFromUnqualifiedId(Name); 6451 TypeSourceInfo *TInfo = 0; 6452 GetTypeFromParser(Type.get(), &TInfo); 6453 6454 if (DiagnoseClassNameShadow(CurContext, NameInfo)) 6455 return 0; 6456 6457 if (DiagnoseUnexpandedParameterPack(Name.StartLocation, TInfo, 6458 UPPC_DeclarationType)) { 6459 Invalid = true; 6460 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 6461 TInfo->getTypeLoc().getBeginLoc()); 6462 } 6463 6464 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, ForRedeclaration); 6465 LookupName(Previous, S); 6466 6467 // Warn about shadowing the name of a template parameter. 6468 if (Previous.isSingleResult() && 6469 Previous.getFoundDecl()->isTemplateParameter()) { 6470 DiagnoseTemplateParameterShadow(Name.StartLocation,Previous.getFoundDecl()); 6471 Previous.clear(); 6472 } 6473 6474 assert(Name.Kind == UnqualifiedId::IK_Identifier && 6475 "name in alias declaration must be an identifier"); 6476 TypeAliasDecl *NewTD = TypeAliasDecl::Create(Context, CurContext, UsingLoc, 6477 Name.StartLocation, 6478 Name.Identifier, TInfo); 6479 6480 NewTD->setAccess(AS); 6481 6482 if (Invalid) 6483 NewTD->setInvalidDecl(); 6484 6485 CheckTypedefForVariablyModifiedType(S, NewTD); 6486 Invalid |= NewTD->isInvalidDecl(); 6487 6488 bool Redeclaration = false; 6489 6490 NamedDecl *NewND; 6491 if (TemplateParamLists.size()) { 6492 TypeAliasTemplateDecl *OldDecl = 0; 6493 TemplateParameterList *OldTemplateParams = 0; 6494 6495 if (TemplateParamLists.size() != 1) { 6496 Diag(UsingLoc, diag::err_alias_template_extra_headers) 6497 << SourceRange(TemplateParamLists.get()[1]->getTemplateLoc(), 6498 TemplateParamLists.get()[TemplateParamLists.size()-1]->getRAngleLoc()); 6499 } 6500 TemplateParameterList *TemplateParams = TemplateParamLists.get()[0]; 6501 6502 // Only consider previous declarations in the same scope. 6503 FilterLookupForScope(Previous, CurContext, S, /*ConsiderLinkage*/false, 6504 /*ExplicitInstantiationOrSpecialization*/false); 6505 if (!Previous.empty()) { 6506 Redeclaration = true; 6507 6508 OldDecl = Previous.getAsSingle<TypeAliasTemplateDecl>(); 6509 if (!OldDecl && !Invalid) { 6510 Diag(UsingLoc, diag::err_redefinition_different_kind) 6511 << Name.Identifier; 6512 6513 NamedDecl *OldD = Previous.getRepresentativeDecl(); 6514 if (OldD->getLocation().isValid()) 6515 Diag(OldD->getLocation(), diag::note_previous_definition); 6516 6517 Invalid = true; 6518 } 6519 6520 if (!Invalid && OldDecl && !OldDecl->isInvalidDecl()) { 6521 if (TemplateParameterListsAreEqual(TemplateParams, 6522 OldDecl->getTemplateParameters(), 6523 /*Complain=*/true, 6524 TPL_TemplateMatch)) 6525 OldTemplateParams = OldDecl->getTemplateParameters(); 6526 else 6527 Invalid = true; 6528 6529 TypeAliasDecl *OldTD = OldDecl->getTemplatedDecl(); 6530 if (!Invalid && 6531 !Context.hasSameType(OldTD->getUnderlyingType(), 6532 NewTD->getUnderlyingType())) { 6533 // FIXME: The C++0x standard does not clearly say this is ill-formed, 6534 // but we can't reasonably accept it. 6535 Diag(NewTD->getLocation(), diag::err_redefinition_different_typedef) 6536 << 2 << NewTD->getUnderlyingType() << OldTD->getUnderlyingType(); 6537 if (OldTD->getLocation().isValid()) 6538 Diag(OldTD->getLocation(), diag::note_previous_definition); 6539 Invalid = true; 6540 } 6541 } 6542 } 6543 6544 // Merge any previous default template arguments into our parameters, 6545 // and check the parameter list. 6546 if (CheckTemplateParameterList(TemplateParams, OldTemplateParams, 6547 TPC_TypeAliasTemplate)) 6548 return 0; 6549 6550 TypeAliasTemplateDecl *NewDecl = 6551 TypeAliasTemplateDecl::Create(Context, CurContext, UsingLoc, 6552 Name.Identifier, TemplateParams, 6553 NewTD); 6554 6555 NewDecl->setAccess(AS); 6556 6557 if (Invalid) 6558 NewDecl->setInvalidDecl(); 6559 else if (OldDecl) 6560 NewDecl->setPreviousDeclaration(OldDecl); 6561 6562 NewND = NewDecl; 6563 } else { 6564 ActOnTypedefNameDecl(S, CurContext, NewTD, Previous, Redeclaration); 6565 NewND = NewTD; 6566 } 6567 6568 if (!Redeclaration) 6569 PushOnScopeChains(NewND, S); 6570 6571 return NewND; 6572} 6573 6574Decl *Sema::ActOnNamespaceAliasDef(Scope *S, 6575 SourceLocation NamespaceLoc, 6576 SourceLocation AliasLoc, 6577 IdentifierInfo *Alias, 6578 CXXScopeSpec &SS, 6579 SourceLocation IdentLoc, 6580 IdentifierInfo *Ident) { 6581 6582 // Lookup the namespace name. 6583 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 6584 LookupParsedName(R, S, &SS); 6585 6586 // Check if we have a previous declaration with the same name. 6587 NamedDecl *PrevDecl 6588 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 6589 ForRedeclaration); 6590 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 6591 PrevDecl = 0; 6592 6593 if (PrevDecl) { 6594 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 6595 // We already have an alias with the same name that points to the same 6596 // namespace, so don't create a new one. 6597 // FIXME: At some point, we'll want to create the (redundant) 6598 // declaration to maintain better source information. 6599 if (!R.isAmbiguous() && !R.empty() && 6600 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 6601 return 0; 6602 } 6603 6604 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 6605 diag::err_redefinition_different_kind; 6606 Diag(AliasLoc, DiagID) << Alias; 6607 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 6608 return 0; 6609 } 6610 6611 if (R.isAmbiguous()) 6612 return 0; 6613 6614 if (R.empty()) { 6615 if (!TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, Ident)) { 6616 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 6617 return 0; 6618 } 6619 } 6620 6621 NamespaceAliasDecl *AliasDecl = 6622 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 6623 Alias, SS.getWithLocInContext(Context), 6624 IdentLoc, R.getFoundDecl()); 6625 6626 PushOnScopeChains(AliasDecl, S); 6627 return AliasDecl; 6628} 6629 6630namespace { 6631 /// \brief Scoped object used to handle the state changes required in Sema 6632 /// to implicitly define the body of a C++ member function; 6633 class ImplicitlyDefinedFunctionScope { 6634 Sema &S; 6635 Sema::ContextRAII SavedContext; 6636 6637 public: 6638 ImplicitlyDefinedFunctionScope(Sema &S, CXXMethodDecl *Method) 6639 : S(S), SavedContext(S, Method) 6640 { 6641 S.PushFunctionScope(); 6642 S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated); 6643 } 6644 6645 ~ImplicitlyDefinedFunctionScope() { 6646 S.PopExpressionEvaluationContext(); 6647 S.PopFunctionScopeInfo(); 6648 } 6649 }; 6650} 6651 6652Sema::ImplicitExceptionSpecification 6653Sema::ComputeDefaultedDefaultCtorExceptionSpec(CXXRecordDecl *ClassDecl) { 6654 // C++ [except.spec]p14: 6655 // An implicitly declared special member function (Clause 12) shall have an 6656 // exception-specification. [...] 6657 ImplicitExceptionSpecification ExceptSpec(*this); 6658 if (ClassDecl->isInvalidDecl()) 6659 return ExceptSpec; 6660 6661 // Direct base-class constructors. 6662 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 6663 BEnd = ClassDecl->bases_end(); 6664 B != BEnd; ++B) { 6665 if (B->isVirtual()) // Handled below. 6666 continue; 6667 6668 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 6669 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 6670 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 6671 // If this is a deleted function, add it anyway. This might be conformant 6672 // with the standard. This might not. I'm not sure. It might not matter. 6673 if (Constructor) 6674 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 6675 } 6676 } 6677 6678 // Virtual base-class constructors. 6679 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 6680 BEnd = ClassDecl->vbases_end(); 6681 B != BEnd; ++B) { 6682 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 6683 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 6684 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 6685 // If this is a deleted function, add it anyway. This might be conformant 6686 // with the standard. This might not. I'm not sure. It might not matter. 6687 if (Constructor) 6688 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 6689 } 6690 } 6691 6692 // Field constructors. 6693 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 6694 FEnd = ClassDecl->field_end(); 6695 F != FEnd; ++F) { 6696 if (F->hasInClassInitializer()) { 6697 if (Expr *E = F->getInClassInitializer()) 6698 ExceptSpec.CalledExpr(E); 6699 else if (!F->isInvalidDecl()) 6700 ExceptSpec.SetDelayed(); 6701 } else if (const RecordType *RecordTy 6702 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 6703 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 6704 CXXConstructorDecl *Constructor = LookupDefaultConstructor(FieldRecDecl); 6705 // If this is a deleted function, add it anyway. This might be conformant 6706 // with the standard. This might not. I'm not sure. It might not matter. 6707 // In particular, the problem is that this function never gets called. It 6708 // might just be ill-formed because this function attempts to refer to 6709 // a deleted function here. 6710 if (Constructor) 6711 ExceptSpec.CalledDecl(F->getLocation(), Constructor); 6712 } 6713 } 6714 6715 return ExceptSpec; 6716} 6717 6718CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( 6719 CXXRecordDecl *ClassDecl) { 6720 // C++ [class.ctor]p5: 6721 // A default constructor for a class X is a constructor of class X 6722 // that can be called without an argument. If there is no 6723 // user-declared constructor for class X, a default constructor is 6724 // implicitly declared. An implicitly-declared default constructor 6725 // is an inline public member of its class. 6726 assert(!ClassDecl->hasUserDeclaredConstructor() && 6727 "Should not build implicit default constructor!"); 6728 6729 ImplicitExceptionSpecification Spec = 6730 ComputeDefaultedDefaultCtorExceptionSpec(ClassDecl); 6731 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 6732 6733 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, 6734 CXXDefaultConstructor, 6735 false); 6736 6737 // Create the actual constructor declaration. 6738 CanQualType ClassType 6739 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 6740 SourceLocation ClassLoc = ClassDecl->getLocation(); 6741 DeclarationName Name 6742 = Context.DeclarationNames.getCXXConstructorName(ClassType); 6743 DeclarationNameInfo NameInfo(Name, ClassLoc); 6744 CXXConstructorDecl *DefaultCon = CXXConstructorDecl::Create( 6745 Context, ClassDecl, ClassLoc, NameInfo, 6746 Context.getFunctionType(Context.VoidTy, 0, 0, EPI), /*TInfo=*/0, 6747 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 6748 Constexpr); 6749 DefaultCon->setAccess(AS_public); 6750 DefaultCon->setDefaulted(); 6751 DefaultCon->setImplicit(); 6752 DefaultCon->setTrivial(ClassDecl->hasTrivialDefaultConstructor()); 6753 6754 // Note that we have declared this constructor. 6755 ++ASTContext::NumImplicitDefaultConstructorsDeclared; 6756 6757 if (Scope *S = getScopeForContext(ClassDecl)) 6758 PushOnScopeChains(DefaultCon, S, false); 6759 ClassDecl->addDecl(DefaultCon); 6760 6761 if (ShouldDeleteSpecialMember(DefaultCon, CXXDefaultConstructor)) 6762 DefaultCon->setDeletedAsWritten(); 6763 6764 return DefaultCon; 6765} 6766 6767void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 6768 CXXConstructorDecl *Constructor) { 6769 assert((Constructor->isDefaulted() && Constructor->isDefaultConstructor() && 6770 !Constructor->doesThisDeclarationHaveABody() && 6771 !Constructor->isDeleted()) && 6772 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 6773 6774 CXXRecordDecl *ClassDecl = Constructor->getParent(); 6775 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 6776 6777 ImplicitlyDefinedFunctionScope Scope(*this, Constructor); 6778 DiagnosticErrorTrap Trap(Diags); 6779 if (SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false) || 6780 Trap.hasErrorOccurred()) { 6781 Diag(CurrentLocation, diag::note_member_synthesized_at) 6782 << CXXDefaultConstructor << Context.getTagDeclType(ClassDecl); 6783 Constructor->setInvalidDecl(); 6784 return; 6785 } 6786 6787 SourceLocation Loc = Constructor->getLocation(); 6788 Constructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 6789 6790 Constructor->setUsed(); 6791 MarkVTableUsed(CurrentLocation, ClassDecl); 6792 6793 if (ASTMutationListener *L = getASTMutationListener()) { 6794 L->CompletedImplicitDefinition(Constructor); 6795 } 6796} 6797 6798/// Get any existing defaulted default constructor for the given class. Do not 6799/// implicitly define one if it does not exist. 6800static CXXConstructorDecl *getDefaultedDefaultConstructorUnsafe(Sema &Self, 6801 CXXRecordDecl *D) { 6802 ASTContext &Context = Self.Context; 6803 QualType ClassType = Context.getTypeDeclType(D); 6804 DeclarationName ConstructorName 6805 = Context.DeclarationNames.getCXXConstructorName( 6806 Context.getCanonicalType(ClassType.getUnqualifiedType())); 6807 6808 DeclContext::lookup_const_iterator Con, ConEnd; 6809 for (llvm::tie(Con, ConEnd) = D->lookup(ConstructorName); 6810 Con != ConEnd; ++Con) { 6811 // A function template cannot be defaulted. 6812 if (isa<FunctionTemplateDecl>(*Con)) 6813 continue; 6814 6815 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 6816 if (Constructor->isDefaultConstructor()) 6817 return Constructor->isDefaulted() ? Constructor : 0; 6818 } 6819 return 0; 6820} 6821 6822void Sema::ActOnFinishDelayedMemberInitializers(Decl *D) { 6823 if (!D) return; 6824 AdjustDeclIfTemplate(D); 6825 6826 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(D); 6827 CXXConstructorDecl *CtorDecl 6828 = getDefaultedDefaultConstructorUnsafe(*this, ClassDecl); 6829 6830 if (!CtorDecl) return; 6831 6832 // Compute the exception specification for the default constructor. 6833 const FunctionProtoType *CtorTy = 6834 CtorDecl->getType()->castAs<FunctionProtoType>(); 6835 if (CtorTy->getExceptionSpecType() == EST_Delayed) { 6836 // FIXME: Don't do this unless the exception spec is needed. 6837 ImplicitExceptionSpecification Spec = 6838 ComputeDefaultedDefaultCtorExceptionSpec(ClassDecl); 6839 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 6840 assert(EPI.ExceptionSpecType != EST_Delayed); 6841 6842 CtorDecl->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 6843 } 6844 6845 // If the default constructor is explicitly defaulted, checking the exception 6846 // specification is deferred until now. 6847 if (!CtorDecl->isInvalidDecl() && CtorDecl->isExplicitlyDefaulted() && 6848 !ClassDecl->isDependentType()) 6849 CheckExplicitlyDefaultedSpecialMember(CtorDecl); 6850} 6851 6852void Sema::DeclareInheritedConstructors(CXXRecordDecl *ClassDecl) { 6853 // We start with an initial pass over the base classes to collect those that 6854 // inherit constructors from. If there are none, we can forgo all further 6855 // processing. 6856 typedef SmallVector<const RecordType *, 4> BasesVector; 6857 BasesVector BasesToInheritFrom; 6858 for (CXXRecordDecl::base_class_iterator BaseIt = ClassDecl->bases_begin(), 6859 BaseE = ClassDecl->bases_end(); 6860 BaseIt != BaseE; ++BaseIt) { 6861 if (BaseIt->getInheritConstructors()) { 6862 QualType Base = BaseIt->getType(); 6863 if (Base->isDependentType()) { 6864 // If we inherit constructors from anything that is dependent, just 6865 // abort processing altogether. We'll get another chance for the 6866 // instantiations. 6867 return; 6868 } 6869 BasesToInheritFrom.push_back(Base->castAs<RecordType>()); 6870 } 6871 } 6872 if (BasesToInheritFrom.empty()) 6873 return; 6874 6875 // Now collect the constructors that we already have in the current class. 6876 // Those take precedence over inherited constructors. 6877 // C++0x [class.inhctor]p3: [...] a constructor is implicitly declared [...] 6878 // unless there is a user-declared constructor with the same signature in 6879 // the class where the using-declaration appears. 6880 llvm::SmallSet<const Type *, 8> ExistingConstructors; 6881 for (CXXRecordDecl::ctor_iterator CtorIt = ClassDecl->ctor_begin(), 6882 CtorE = ClassDecl->ctor_end(); 6883 CtorIt != CtorE; ++CtorIt) { 6884 ExistingConstructors.insert( 6885 Context.getCanonicalType(CtorIt->getType()).getTypePtr()); 6886 } 6887 6888 DeclarationName CreatedCtorName = 6889 Context.DeclarationNames.getCXXConstructorName( 6890 ClassDecl->getTypeForDecl()->getCanonicalTypeUnqualified()); 6891 6892 // Now comes the true work. 6893 // First, we keep a map from constructor types to the base that introduced 6894 // them. Needed for finding conflicting constructors. We also keep the 6895 // actually inserted declarations in there, for pretty diagnostics. 6896 typedef std::pair<CanQualType, CXXConstructorDecl *> ConstructorInfo; 6897 typedef llvm::DenseMap<const Type *, ConstructorInfo> ConstructorToSourceMap; 6898 ConstructorToSourceMap InheritedConstructors; 6899 for (BasesVector::iterator BaseIt = BasesToInheritFrom.begin(), 6900 BaseE = BasesToInheritFrom.end(); 6901 BaseIt != BaseE; ++BaseIt) { 6902 const RecordType *Base = *BaseIt; 6903 CanQualType CanonicalBase = Base->getCanonicalTypeUnqualified(); 6904 CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(Base->getDecl()); 6905 for (CXXRecordDecl::ctor_iterator CtorIt = BaseDecl->ctor_begin(), 6906 CtorE = BaseDecl->ctor_end(); 6907 CtorIt != CtorE; ++CtorIt) { 6908 // Find the using declaration for inheriting this base's constructors. 6909 // FIXME: Don't perform name lookup just to obtain a source location! 6910 DeclarationName Name = 6911 Context.DeclarationNames.getCXXConstructorName(CanonicalBase); 6912 LookupResult Result(*this, Name, SourceLocation(), LookupUsingDeclName); 6913 LookupQualifiedName(Result, CurContext); 6914 UsingDecl *UD = Result.getAsSingle<UsingDecl>(); 6915 SourceLocation UsingLoc = UD ? UD->getLocation() : 6916 ClassDecl->getLocation(); 6917 6918 // C++0x [class.inhctor]p1: The candidate set of inherited constructors 6919 // from the class X named in the using-declaration consists of actual 6920 // constructors and notional constructors that result from the 6921 // transformation of defaulted parameters as follows: 6922 // - all non-template default constructors of X, and 6923 // - for each non-template constructor of X that has at least one 6924 // parameter with a default argument, the set of constructors that 6925 // results from omitting any ellipsis parameter specification and 6926 // successively omitting parameters with a default argument from the 6927 // end of the parameter-type-list. 6928 CXXConstructorDecl *BaseCtor = *CtorIt; 6929 bool CanBeCopyOrMove = BaseCtor->isCopyOrMoveConstructor(); 6930 const FunctionProtoType *BaseCtorType = 6931 BaseCtor->getType()->getAs<FunctionProtoType>(); 6932 6933 for (unsigned params = BaseCtor->getMinRequiredArguments(), 6934 maxParams = BaseCtor->getNumParams(); 6935 params <= maxParams; ++params) { 6936 // Skip default constructors. They're never inherited. 6937 if (params == 0) 6938 continue; 6939 // Skip copy and move constructors for the same reason. 6940 if (CanBeCopyOrMove && params == 1) 6941 continue; 6942 6943 // Build up a function type for this particular constructor. 6944 // FIXME: The working paper does not consider that the exception spec 6945 // for the inheriting constructor might be larger than that of the 6946 // source. This code doesn't yet, either. When it does, this code will 6947 // need to be delayed until after exception specifications and in-class 6948 // member initializers are attached. 6949 const Type *NewCtorType; 6950 if (params == maxParams) 6951 NewCtorType = BaseCtorType; 6952 else { 6953 SmallVector<QualType, 16> Args; 6954 for (unsigned i = 0; i < params; ++i) { 6955 Args.push_back(BaseCtorType->getArgType(i)); 6956 } 6957 FunctionProtoType::ExtProtoInfo ExtInfo = 6958 BaseCtorType->getExtProtoInfo(); 6959 ExtInfo.Variadic = false; 6960 NewCtorType = Context.getFunctionType(BaseCtorType->getResultType(), 6961 Args.data(), params, ExtInfo) 6962 .getTypePtr(); 6963 } 6964 const Type *CanonicalNewCtorType = 6965 Context.getCanonicalType(NewCtorType); 6966 6967 // Now that we have the type, first check if the class already has a 6968 // constructor with this signature. 6969 if (ExistingConstructors.count(CanonicalNewCtorType)) 6970 continue; 6971 6972 // Then we check if we have already declared an inherited constructor 6973 // with this signature. 6974 std::pair<ConstructorToSourceMap::iterator, bool> result = 6975 InheritedConstructors.insert(std::make_pair( 6976 CanonicalNewCtorType, 6977 std::make_pair(CanonicalBase, (CXXConstructorDecl*)0))); 6978 if (!result.second) { 6979 // Already in the map. If it came from a different class, that's an 6980 // error. Not if it's from the same. 6981 CanQualType PreviousBase = result.first->second.first; 6982 if (CanonicalBase != PreviousBase) { 6983 const CXXConstructorDecl *PrevCtor = result.first->second.second; 6984 const CXXConstructorDecl *PrevBaseCtor = 6985 PrevCtor->getInheritedConstructor(); 6986 assert(PrevBaseCtor && "Conflicting constructor was not inherited"); 6987 6988 Diag(UsingLoc, diag::err_using_decl_constructor_conflict); 6989 Diag(BaseCtor->getLocation(), 6990 diag::note_using_decl_constructor_conflict_current_ctor); 6991 Diag(PrevBaseCtor->getLocation(), 6992 diag::note_using_decl_constructor_conflict_previous_ctor); 6993 Diag(PrevCtor->getLocation(), 6994 diag::note_using_decl_constructor_conflict_previous_using); 6995 } 6996 continue; 6997 } 6998 6999 // OK, we're there, now add the constructor. 7000 // C++0x [class.inhctor]p8: [...] that would be performed by a 7001 // user-written inline constructor [...] 7002 DeclarationNameInfo DNI(CreatedCtorName, UsingLoc); 7003 CXXConstructorDecl *NewCtor = CXXConstructorDecl::Create( 7004 Context, ClassDecl, UsingLoc, DNI, QualType(NewCtorType, 0), 7005 /*TInfo=*/0, BaseCtor->isExplicit(), /*Inline=*/true, 7006 /*ImplicitlyDeclared=*/true, 7007 // FIXME: Due to a defect in the standard, we treat inherited 7008 // constructors as constexpr even if that makes them ill-formed. 7009 /*Constexpr=*/BaseCtor->isConstexpr()); 7010 NewCtor->setAccess(BaseCtor->getAccess()); 7011 7012 // Build up the parameter decls and add them. 7013 SmallVector<ParmVarDecl *, 16> ParamDecls; 7014 for (unsigned i = 0; i < params; ++i) { 7015 ParamDecls.push_back(ParmVarDecl::Create(Context, NewCtor, 7016 UsingLoc, UsingLoc, 7017 /*IdentifierInfo=*/0, 7018 BaseCtorType->getArgType(i), 7019 /*TInfo=*/0, SC_None, 7020 SC_None, /*DefaultArg=*/0)); 7021 } 7022 NewCtor->setParams(ParamDecls); 7023 NewCtor->setInheritedConstructor(BaseCtor); 7024 7025 ClassDecl->addDecl(NewCtor); 7026 result.first->second.second = NewCtor; 7027 } 7028 } 7029 } 7030} 7031 7032Sema::ImplicitExceptionSpecification 7033Sema::ComputeDefaultedDtorExceptionSpec(CXXRecordDecl *ClassDecl) { 7034 // C++ [except.spec]p14: 7035 // An implicitly declared special member function (Clause 12) shall have 7036 // an exception-specification. 7037 ImplicitExceptionSpecification ExceptSpec(*this); 7038 if (ClassDecl->isInvalidDecl()) 7039 return ExceptSpec; 7040 7041 // Direct base-class destructors. 7042 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 7043 BEnd = ClassDecl->bases_end(); 7044 B != BEnd; ++B) { 7045 if (B->isVirtual()) // Handled below. 7046 continue; 7047 7048 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 7049 ExceptSpec.CalledDecl(B->getLocStart(), 7050 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 7051 } 7052 7053 // Virtual base-class destructors. 7054 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 7055 BEnd = ClassDecl->vbases_end(); 7056 B != BEnd; ++B) { 7057 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 7058 ExceptSpec.CalledDecl(B->getLocStart(), 7059 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 7060 } 7061 7062 // Field destructors. 7063 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 7064 FEnd = ClassDecl->field_end(); 7065 F != FEnd; ++F) { 7066 if (const RecordType *RecordTy 7067 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 7068 ExceptSpec.CalledDecl(F->getLocation(), 7069 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl()))); 7070 } 7071 7072 return ExceptSpec; 7073} 7074 7075CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { 7076 // C++ [class.dtor]p2: 7077 // If a class has no user-declared destructor, a destructor is 7078 // declared implicitly. An implicitly-declared destructor is an 7079 // inline public member of its class. 7080 7081 ImplicitExceptionSpecification Spec = 7082 ComputeDefaultedDtorExceptionSpec(ClassDecl); 7083 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 7084 7085 // Create the actual destructor declaration. 7086 QualType Ty = Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 7087 7088 CanQualType ClassType 7089 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 7090 SourceLocation ClassLoc = ClassDecl->getLocation(); 7091 DeclarationName Name 7092 = Context.DeclarationNames.getCXXDestructorName(ClassType); 7093 DeclarationNameInfo NameInfo(Name, ClassLoc); 7094 CXXDestructorDecl *Destructor 7095 = CXXDestructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, Ty, 0, 7096 /*isInline=*/true, 7097 /*isImplicitlyDeclared=*/true); 7098 Destructor->setAccess(AS_public); 7099 Destructor->setDefaulted(); 7100 Destructor->setImplicit(); 7101 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 7102 7103 // Note that we have declared this destructor. 7104 ++ASTContext::NumImplicitDestructorsDeclared; 7105 7106 // Introduce this destructor into its scope. 7107 if (Scope *S = getScopeForContext(ClassDecl)) 7108 PushOnScopeChains(Destructor, S, false); 7109 ClassDecl->addDecl(Destructor); 7110 7111 // This could be uniqued if it ever proves significant. 7112 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 7113 7114 AddOverriddenMethods(ClassDecl, Destructor); 7115 7116 if (ShouldDeleteSpecialMember(Destructor, CXXDestructor)) 7117 Destructor->setDeletedAsWritten(); 7118 7119 return Destructor; 7120} 7121 7122void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 7123 CXXDestructorDecl *Destructor) { 7124 assert((Destructor->isDefaulted() && 7125 !Destructor->doesThisDeclarationHaveABody() && 7126 !Destructor->isDeleted()) && 7127 "DefineImplicitDestructor - call it for implicit default dtor"); 7128 CXXRecordDecl *ClassDecl = Destructor->getParent(); 7129 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 7130 7131 if (Destructor->isInvalidDecl()) 7132 return; 7133 7134 ImplicitlyDefinedFunctionScope Scope(*this, Destructor); 7135 7136 DiagnosticErrorTrap Trap(Diags); 7137 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 7138 Destructor->getParent()); 7139 7140 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 7141 Diag(CurrentLocation, diag::note_member_synthesized_at) 7142 << CXXDestructor << Context.getTagDeclType(ClassDecl); 7143 7144 Destructor->setInvalidDecl(); 7145 return; 7146 } 7147 7148 SourceLocation Loc = Destructor->getLocation(); 7149 Destructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 7150 Destructor->setImplicitlyDefined(true); 7151 Destructor->setUsed(); 7152 MarkVTableUsed(CurrentLocation, ClassDecl); 7153 7154 if (ASTMutationListener *L = getASTMutationListener()) { 7155 L->CompletedImplicitDefinition(Destructor); 7156 } 7157} 7158 7159/// \brief Perform any semantic analysis which needs to be delayed until all 7160/// pending class member declarations have been parsed. 7161void Sema::ActOnFinishCXXMemberDecls() { 7162 // Now we have parsed all exception specifications, determine the implicit 7163 // exception specifications for destructors. 7164 for (unsigned i = 0, e = DelayedDestructorExceptionSpecs.size(); 7165 i != e; ++i) { 7166 CXXDestructorDecl *Dtor = DelayedDestructorExceptionSpecs[i]; 7167 AdjustDestructorExceptionSpec(Dtor->getParent(), Dtor, true); 7168 } 7169 DelayedDestructorExceptionSpecs.clear(); 7170 7171 // Perform any deferred checking of exception specifications for virtual 7172 // destructors. 7173 for (unsigned i = 0, e = DelayedDestructorExceptionSpecChecks.size(); 7174 i != e; ++i) { 7175 const CXXDestructorDecl *Dtor = 7176 DelayedDestructorExceptionSpecChecks[i].first; 7177 assert(!Dtor->getParent()->isDependentType() && 7178 "Should not ever add destructors of templates into the list."); 7179 CheckOverridingFunctionExceptionSpec(Dtor, 7180 DelayedDestructorExceptionSpecChecks[i].second); 7181 } 7182 DelayedDestructorExceptionSpecChecks.clear(); 7183} 7184 7185void Sema::AdjustDestructorExceptionSpec(CXXRecordDecl *classDecl, 7186 CXXDestructorDecl *destructor, 7187 bool WasDelayed) { 7188 // C++11 [class.dtor]p3: 7189 // A declaration of a destructor that does not have an exception- 7190 // specification is implicitly considered to have the same exception- 7191 // specification as an implicit declaration. 7192 const FunctionProtoType *dtorType = destructor->getType()-> 7193 getAs<FunctionProtoType>(); 7194 if (!WasDelayed && dtorType->hasExceptionSpec()) 7195 return; 7196 7197 ImplicitExceptionSpecification exceptSpec = 7198 ComputeDefaultedDtorExceptionSpec(classDecl); 7199 7200 // Replace the destructor's type, building off the existing one. Fortunately, 7201 // the only thing of interest in the destructor type is its extended info. 7202 // The return and arguments are fixed. 7203 FunctionProtoType::ExtProtoInfo epi = dtorType->getExtProtoInfo(); 7204 epi.ExceptionSpecType = exceptSpec.getExceptionSpecType(); 7205 epi.NumExceptions = exceptSpec.size(); 7206 epi.Exceptions = exceptSpec.data(); 7207 QualType ty = Context.getFunctionType(Context.VoidTy, 0, 0, epi); 7208 7209 destructor->setType(ty); 7210 7211 // If we can't compute the exception specification for this destructor yet 7212 // (because it depends on an exception specification which we have not parsed 7213 // yet), make a note that we need to try again when the class is complete. 7214 if (epi.ExceptionSpecType == EST_Delayed) { 7215 assert(!WasDelayed && "couldn't compute destructor exception spec"); 7216 DelayedDestructorExceptionSpecs.push_back(destructor); 7217 } 7218 7219 // FIXME: If the destructor has a body that could throw, and the newly created 7220 // spec doesn't allow exceptions, we should emit a warning, because this 7221 // change in behavior can break conforming C++03 programs at runtime. 7222 // However, we don't have a body yet, so it needs to be done somewhere else. 7223} 7224 7225/// \brief Builds a statement that copies/moves the given entity from \p From to 7226/// \c To. 7227/// 7228/// This routine is used to copy/move the members of a class with an 7229/// implicitly-declared copy/move assignment operator. When the entities being 7230/// copied are arrays, this routine builds for loops to copy them. 7231/// 7232/// \param S The Sema object used for type-checking. 7233/// 7234/// \param Loc The location where the implicit copy/move is being generated. 7235/// 7236/// \param T The type of the expressions being copied/moved. Both expressions 7237/// must have this type. 7238/// 7239/// \param To The expression we are copying/moving to. 7240/// 7241/// \param From The expression we are copying/moving from. 7242/// 7243/// \param CopyingBaseSubobject Whether we're copying/moving a base subobject. 7244/// Otherwise, it's a non-static member subobject. 7245/// 7246/// \param Copying Whether we're copying or moving. 7247/// 7248/// \param Depth Internal parameter recording the depth of the recursion. 7249/// 7250/// \returns A statement or a loop that copies the expressions. 7251static StmtResult 7252BuildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 7253 Expr *To, Expr *From, 7254 bool CopyingBaseSubobject, bool Copying, 7255 unsigned Depth = 0) { 7256 // C++0x [class.copy]p28: 7257 // Each subobject is assigned in the manner appropriate to its type: 7258 // 7259 // - if the subobject is of class type, as if by a call to operator= with 7260 // the subobject as the object expression and the corresponding 7261 // subobject of x as a single function argument (as if by explicit 7262 // qualification; that is, ignoring any possible virtual overriding 7263 // functions in more derived classes); 7264 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 7265 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 7266 7267 // Look for operator=. 7268 DeclarationName Name 7269 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 7270 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 7271 S.LookupQualifiedName(OpLookup, ClassDecl, false); 7272 7273 // Filter out any result that isn't a copy/move-assignment operator. 7274 LookupResult::Filter F = OpLookup.makeFilter(); 7275 while (F.hasNext()) { 7276 NamedDecl *D = F.next(); 7277 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 7278 if (Method->isCopyAssignmentOperator() || 7279 (!Copying && Method->isMoveAssignmentOperator())) 7280 continue; 7281 7282 F.erase(); 7283 } 7284 F.done(); 7285 7286 // Suppress the protected check (C++ [class.protected]) for each of the 7287 // assignment operators we found. This strange dance is required when 7288 // we're assigning via a base classes's copy-assignment operator. To 7289 // ensure that we're getting the right base class subobject (without 7290 // ambiguities), we need to cast "this" to that subobject type; to 7291 // ensure that we don't go through the virtual call mechanism, we need 7292 // to qualify the operator= name with the base class (see below). However, 7293 // this means that if the base class has a protected copy assignment 7294 // operator, the protected member access check will fail. So, we 7295 // rewrite "protected" access to "public" access in this case, since we 7296 // know by construction that we're calling from a derived class. 7297 if (CopyingBaseSubobject) { 7298 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 7299 L != LEnd; ++L) { 7300 if (L.getAccess() == AS_protected) 7301 L.setAccess(AS_public); 7302 } 7303 } 7304 7305 // Create the nested-name-specifier that will be used to qualify the 7306 // reference to operator=; this is required to suppress the virtual 7307 // call mechanism. 7308 CXXScopeSpec SS; 7309 const Type *CanonicalT = S.Context.getCanonicalType(T.getTypePtr()); 7310 SS.MakeTrivial(S.Context, 7311 NestedNameSpecifier::Create(S.Context, 0, false, 7312 CanonicalT), 7313 Loc); 7314 7315 // Create the reference to operator=. 7316 ExprResult OpEqualRef 7317 = S.BuildMemberReferenceExpr(To, T, Loc, /*isArrow=*/false, SS, 7318 /*TemplateKWLoc=*/SourceLocation(), 7319 /*FirstQualifierInScope=*/0, 7320 OpLookup, 7321 /*TemplateArgs=*/0, 7322 /*SuppressQualifierCheck=*/true); 7323 if (OpEqualRef.isInvalid()) 7324 return StmtError(); 7325 7326 // Build the call to the assignment operator. 7327 7328 ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 7329 OpEqualRef.takeAs<Expr>(), 7330 Loc, &From, 1, Loc); 7331 if (Call.isInvalid()) 7332 return StmtError(); 7333 7334 return S.Owned(Call.takeAs<Stmt>()); 7335 } 7336 7337 // - if the subobject is of scalar type, the built-in assignment 7338 // operator is used. 7339 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 7340 if (!ArrayTy) { 7341 ExprResult Assignment = S.CreateBuiltinBinOp(Loc, BO_Assign, To, From); 7342 if (Assignment.isInvalid()) 7343 return StmtError(); 7344 7345 return S.Owned(Assignment.takeAs<Stmt>()); 7346 } 7347 7348 // - if the subobject is an array, each element is assigned, in the 7349 // manner appropriate to the element type; 7350 7351 // Construct a loop over the array bounds, e.g., 7352 // 7353 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 7354 // 7355 // that will copy each of the array elements. 7356 QualType SizeType = S.Context.getSizeType(); 7357 7358 // Create the iteration variable. 7359 IdentifierInfo *IterationVarName = 0; 7360 { 7361 SmallString<8> Str; 7362 llvm::raw_svector_ostream OS(Str); 7363 OS << "__i" << Depth; 7364 IterationVarName = &S.Context.Idents.get(OS.str()); 7365 } 7366 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, Loc, 7367 IterationVarName, SizeType, 7368 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 7369 SC_None, SC_None); 7370 7371 // Initialize the iteration variable to zero. 7372 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 7373 IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc)); 7374 7375 // Create a reference to the iteration variable; we'll use this several 7376 // times throughout. 7377 Expr *IterationVarRef 7378 = S.BuildDeclRefExpr(IterationVar, SizeType, VK_LValue, Loc).take(); 7379 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 7380 Expr *IterationVarRefRVal = S.DefaultLvalueConversion(IterationVarRef).take(); 7381 assert(IterationVarRefRVal && "Conversion of invented variable cannot fail!"); 7382 7383 // Create the DeclStmt that holds the iteration variable. 7384 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 7385 7386 // Create the comparison against the array bound. 7387 llvm::APInt Upper 7388 = ArrayTy->getSize().zextOrTrunc(S.Context.getTypeSize(SizeType)); 7389 Expr *Comparison 7390 = new (S.Context) BinaryOperator(IterationVarRefRVal, 7391 IntegerLiteral::Create(S.Context, Upper, SizeType, Loc), 7392 BO_NE, S.Context.BoolTy, 7393 VK_RValue, OK_Ordinary, Loc); 7394 7395 // Create the pre-increment of the iteration variable. 7396 Expr *Increment 7397 = new (S.Context) UnaryOperator(IterationVarRef, UO_PreInc, SizeType, 7398 VK_LValue, OK_Ordinary, Loc); 7399 7400 // Subscript the "from" and "to" expressions with the iteration variable. 7401 From = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(From, Loc, 7402 IterationVarRefRVal, 7403 Loc)); 7404 To = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(To, Loc, 7405 IterationVarRefRVal, 7406 Loc)); 7407 if (!Copying) // Cast to rvalue 7408 From = CastForMoving(S, From); 7409 7410 // Build the copy/move for an individual element of the array. 7411 StmtResult Copy = BuildSingleCopyAssign(S, Loc, ArrayTy->getElementType(), 7412 To, From, CopyingBaseSubobject, 7413 Copying, Depth + 1); 7414 if (Copy.isInvalid()) 7415 return StmtError(); 7416 7417 // Construct the loop that copies all elements of this array. 7418 return S.ActOnForStmt(Loc, Loc, InitStmt, 7419 S.MakeFullExpr(Comparison), 7420 0, S.MakeFullExpr(Increment), 7421 Loc, Copy.take()); 7422} 7423 7424std::pair<Sema::ImplicitExceptionSpecification, bool> 7425Sema::ComputeDefaultedCopyAssignmentExceptionSpecAndConst( 7426 CXXRecordDecl *ClassDecl) { 7427 if (ClassDecl->isInvalidDecl()) 7428 return std::make_pair(ImplicitExceptionSpecification(*this), true); 7429 7430 // C++ [class.copy]p10: 7431 // If the class definition does not explicitly declare a copy 7432 // assignment operator, one is declared implicitly. 7433 // The implicitly-defined copy assignment operator for a class X 7434 // will have the form 7435 // 7436 // X& X::operator=(const X&) 7437 // 7438 // if 7439 bool HasConstCopyAssignment = true; 7440 7441 // -- each direct base class B of X has a copy assignment operator 7442 // whose parameter is of type const B&, const volatile B& or B, 7443 // and 7444 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7445 BaseEnd = ClassDecl->bases_end(); 7446 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 7447 // We'll handle this below 7448 if (LangOpts.CPlusPlus0x && Base->isVirtual()) 7449 continue; 7450 7451 assert(!Base->getType()->isDependentType() && 7452 "Cannot generate implicit members for class with dependent bases."); 7453 CXXRecordDecl *BaseClassDecl = Base->getType()->getAsCXXRecordDecl(); 7454 HasConstCopyAssignment &= 7455 (bool)LookupCopyingAssignment(BaseClassDecl, Qualifiers::Const, 7456 false, 0); 7457 } 7458 7459 // In C++11, the above citation has "or virtual" added 7460 if (LangOpts.CPlusPlus0x) { 7461 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7462 BaseEnd = ClassDecl->vbases_end(); 7463 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 7464 assert(!Base->getType()->isDependentType() && 7465 "Cannot generate implicit members for class with dependent bases."); 7466 CXXRecordDecl *BaseClassDecl = Base->getType()->getAsCXXRecordDecl(); 7467 HasConstCopyAssignment &= 7468 (bool)LookupCopyingAssignment(BaseClassDecl, Qualifiers::Const, 7469 false, 0); 7470 } 7471 } 7472 7473 // -- for all the nonstatic data members of X that are of a class 7474 // type M (or array thereof), each such class type has a copy 7475 // assignment operator whose parameter is of type const M&, 7476 // const volatile M& or M. 7477 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7478 FieldEnd = ClassDecl->field_end(); 7479 HasConstCopyAssignment && Field != FieldEnd; 7480 ++Field) { 7481 QualType FieldType = Context.getBaseElementType(Field->getType()); 7482 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7483 HasConstCopyAssignment &= 7484 (bool)LookupCopyingAssignment(FieldClassDecl, Qualifiers::Const, 7485 false, 0); 7486 } 7487 } 7488 7489 // Otherwise, the implicitly declared copy assignment operator will 7490 // have the form 7491 // 7492 // X& X::operator=(X&) 7493 7494 // C++ [except.spec]p14: 7495 // An implicitly declared special member function (Clause 12) shall have an 7496 // exception-specification. [...] 7497 7498 // It is unspecified whether or not an implicit copy assignment operator 7499 // attempts to deduplicate calls to assignment operators of virtual bases are 7500 // made. As such, this exception specification is effectively unspecified. 7501 // Based on a similar decision made for constness in C++0x, we're erring on 7502 // the side of assuming such calls to be made regardless of whether they 7503 // actually happen. 7504 ImplicitExceptionSpecification ExceptSpec(*this); 7505 unsigned ArgQuals = HasConstCopyAssignment ? Qualifiers::Const : 0; 7506 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7507 BaseEnd = ClassDecl->bases_end(); 7508 Base != BaseEnd; ++Base) { 7509 if (Base->isVirtual()) 7510 continue; 7511 7512 CXXRecordDecl *BaseClassDecl 7513 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7514 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 7515 ArgQuals, false, 0)) 7516 ExceptSpec.CalledDecl(Base->getLocStart(), CopyAssign); 7517 } 7518 7519 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7520 BaseEnd = ClassDecl->vbases_end(); 7521 Base != BaseEnd; ++Base) { 7522 CXXRecordDecl *BaseClassDecl 7523 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7524 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 7525 ArgQuals, false, 0)) 7526 ExceptSpec.CalledDecl(Base->getLocStart(), CopyAssign); 7527 } 7528 7529 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7530 FieldEnd = ClassDecl->field_end(); 7531 Field != FieldEnd; 7532 ++Field) { 7533 QualType FieldType = Context.getBaseElementType(Field->getType()); 7534 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7535 if (CXXMethodDecl *CopyAssign = 7536 LookupCopyingAssignment(FieldClassDecl, ArgQuals, false, 0)) 7537 ExceptSpec.CalledDecl(Field->getLocation(), CopyAssign); 7538 } 7539 } 7540 7541 return std::make_pair(ExceptSpec, HasConstCopyAssignment); 7542} 7543 7544CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 7545 // Note: The following rules are largely analoguous to the copy 7546 // constructor rules. Note that virtual bases are not taken into account 7547 // for determining the argument type of the operator. Note also that 7548 // operators taking an object instead of a reference are allowed. 7549 7550 ImplicitExceptionSpecification Spec(*this); 7551 bool Const; 7552 llvm::tie(Spec, Const) = 7553 ComputeDefaultedCopyAssignmentExceptionSpecAndConst(ClassDecl); 7554 7555 QualType ArgType = Context.getTypeDeclType(ClassDecl); 7556 QualType RetType = Context.getLValueReferenceType(ArgType); 7557 if (Const) 7558 ArgType = ArgType.withConst(); 7559 ArgType = Context.getLValueReferenceType(ArgType); 7560 7561 // An implicitly-declared copy assignment operator is an inline public 7562 // member of its class. 7563 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 7564 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 7565 SourceLocation ClassLoc = ClassDecl->getLocation(); 7566 DeclarationNameInfo NameInfo(Name, ClassLoc); 7567 CXXMethodDecl *CopyAssignment 7568 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 7569 Context.getFunctionType(RetType, &ArgType, 1, EPI), 7570 /*TInfo=*/0, /*isStatic=*/false, 7571 /*StorageClassAsWritten=*/SC_None, 7572 /*isInline=*/true, /*isConstexpr=*/false, 7573 SourceLocation()); 7574 CopyAssignment->setAccess(AS_public); 7575 CopyAssignment->setDefaulted(); 7576 CopyAssignment->setImplicit(); 7577 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 7578 7579 // Add the parameter to the operator. 7580 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 7581 ClassLoc, ClassLoc, /*Id=*/0, 7582 ArgType, /*TInfo=*/0, 7583 SC_None, 7584 SC_None, 0); 7585 CopyAssignment->setParams(FromParam); 7586 7587 // Note that we have added this copy-assignment operator. 7588 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 7589 7590 if (Scope *S = getScopeForContext(ClassDecl)) 7591 PushOnScopeChains(CopyAssignment, S, false); 7592 ClassDecl->addDecl(CopyAssignment); 7593 7594 // C++0x [class.copy]p19: 7595 // .... If the class definition does not explicitly declare a copy 7596 // assignment operator, there is no user-declared move constructor, and 7597 // there is no user-declared move assignment operator, a copy assignment 7598 // operator is implicitly declared as defaulted. 7599 if (ShouldDeleteSpecialMember(CopyAssignment, CXXCopyAssignment)) 7600 CopyAssignment->setDeletedAsWritten(); 7601 7602 AddOverriddenMethods(ClassDecl, CopyAssignment); 7603 return CopyAssignment; 7604} 7605 7606void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 7607 CXXMethodDecl *CopyAssignOperator) { 7608 assert((CopyAssignOperator->isDefaulted() && 7609 CopyAssignOperator->isOverloadedOperator() && 7610 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 7611 !CopyAssignOperator->doesThisDeclarationHaveABody() && 7612 !CopyAssignOperator->isDeleted()) && 7613 "DefineImplicitCopyAssignment called for wrong function"); 7614 7615 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 7616 7617 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 7618 CopyAssignOperator->setInvalidDecl(); 7619 return; 7620 } 7621 7622 CopyAssignOperator->setUsed(); 7623 7624 ImplicitlyDefinedFunctionScope Scope(*this, CopyAssignOperator); 7625 DiagnosticErrorTrap Trap(Diags); 7626 7627 // C++0x [class.copy]p30: 7628 // The implicitly-defined or explicitly-defaulted copy assignment operator 7629 // for a non-union class X performs memberwise copy assignment of its 7630 // subobjects. The direct base classes of X are assigned first, in the 7631 // order of their declaration in the base-specifier-list, and then the 7632 // immediate non-static data members of X are assigned, in the order in 7633 // which they were declared in the class definition. 7634 7635 // The statements that form the synthesized function body. 7636 ASTOwningVector<Stmt*> Statements(*this); 7637 7638 // The parameter for the "other" object, which we are copying from. 7639 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 7640 Qualifiers OtherQuals = Other->getType().getQualifiers(); 7641 QualType OtherRefType = Other->getType(); 7642 if (const LValueReferenceType *OtherRef 7643 = OtherRefType->getAs<LValueReferenceType>()) { 7644 OtherRefType = OtherRef->getPointeeType(); 7645 OtherQuals = OtherRefType.getQualifiers(); 7646 } 7647 7648 // Our location for everything implicitly-generated. 7649 SourceLocation Loc = CopyAssignOperator->getLocation(); 7650 7651 // Construct a reference to the "other" object. We'll be using this 7652 // throughout the generated ASTs. 7653 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 7654 assert(OtherRef && "Reference to parameter cannot fail!"); 7655 7656 // Construct the "this" pointer. We'll be using this throughout the generated 7657 // ASTs. 7658 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 7659 assert(This && "Reference to this cannot fail!"); 7660 7661 // Assign base classes. 7662 bool Invalid = false; 7663 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7664 E = ClassDecl->bases_end(); Base != E; ++Base) { 7665 // Form the assignment: 7666 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 7667 QualType BaseType = Base->getType().getUnqualifiedType(); 7668 if (!BaseType->isRecordType()) { 7669 Invalid = true; 7670 continue; 7671 } 7672 7673 CXXCastPath BasePath; 7674 BasePath.push_back(Base); 7675 7676 // Construct the "from" expression, which is an implicit cast to the 7677 // appropriately-qualified base type. 7678 Expr *From = OtherRef; 7679 From = ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 7680 CK_UncheckedDerivedToBase, 7681 VK_LValue, &BasePath).take(); 7682 7683 // Dereference "this". 7684 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 7685 7686 // Implicitly cast "this" to the appropriately-qualified base type. 7687 To = ImpCastExprToType(To.take(), 7688 Context.getCVRQualifiedType(BaseType, 7689 CopyAssignOperator->getTypeQualifiers()), 7690 CK_UncheckedDerivedToBase, 7691 VK_LValue, &BasePath); 7692 7693 // Build the copy. 7694 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, BaseType, 7695 To.get(), From, 7696 /*CopyingBaseSubobject=*/true, 7697 /*Copying=*/true); 7698 if (Copy.isInvalid()) { 7699 Diag(CurrentLocation, diag::note_member_synthesized_at) 7700 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7701 CopyAssignOperator->setInvalidDecl(); 7702 return; 7703 } 7704 7705 // Success! Record the copy. 7706 Statements.push_back(Copy.takeAs<Expr>()); 7707 } 7708 7709 // \brief Reference to the __builtin_memcpy function. 7710 Expr *BuiltinMemCpyRef = 0; 7711 // \brief Reference to the __builtin_objc_memmove_collectable function. 7712 Expr *CollectableMemCpyRef = 0; 7713 7714 // Assign non-static members. 7715 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7716 FieldEnd = ClassDecl->field_end(); 7717 Field != FieldEnd; ++Field) { 7718 if (Field->isUnnamedBitfield()) 7719 continue; 7720 7721 // Check for members of reference type; we can't copy those. 7722 if (Field->getType()->isReferenceType()) { 7723 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 7724 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 7725 Diag(Field->getLocation(), diag::note_declared_at); 7726 Diag(CurrentLocation, diag::note_member_synthesized_at) 7727 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7728 Invalid = true; 7729 continue; 7730 } 7731 7732 // Check for members of const-qualified, non-class type. 7733 QualType BaseType = Context.getBaseElementType(Field->getType()); 7734 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 7735 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 7736 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 7737 Diag(Field->getLocation(), diag::note_declared_at); 7738 Diag(CurrentLocation, diag::note_member_synthesized_at) 7739 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7740 Invalid = true; 7741 continue; 7742 } 7743 7744 // Suppress assigning zero-width bitfields. 7745 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0) 7746 continue; 7747 7748 QualType FieldType = Field->getType().getNonReferenceType(); 7749 if (FieldType->isIncompleteArrayType()) { 7750 assert(ClassDecl->hasFlexibleArrayMember() && 7751 "Incomplete array type is not valid"); 7752 continue; 7753 } 7754 7755 // Build references to the field in the object we're copying from and to. 7756 CXXScopeSpec SS; // Intentionally empty 7757 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 7758 LookupMemberName); 7759 MemberLookup.addDecl(*Field); 7760 MemberLookup.resolveKind(); 7761 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 7762 Loc, /*IsArrow=*/false, 7763 SS, SourceLocation(), 0, 7764 MemberLookup, 0); 7765 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 7766 Loc, /*IsArrow=*/true, 7767 SS, SourceLocation(), 0, 7768 MemberLookup, 0); 7769 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 7770 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 7771 7772 // If the field should be copied with __builtin_memcpy rather than via 7773 // explicit assignments, do so. This optimization only applies for arrays 7774 // of scalars and arrays of class type with trivial copy-assignment 7775 // operators. 7776 if (FieldType->isArrayType() && !FieldType.isVolatileQualified() 7777 && BaseType.hasTrivialAssignment(Context, /*Copying=*/true)) { 7778 // Compute the size of the memory buffer to be copied. 7779 QualType SizeType = Context.getSizeType(); 7780 llvm::APInt Size(Context.getTypeSize(SizeType), 7781 Context.getTypeSizeInChars(BaseType).getQuantity()); 7782 for (const ConstantArrayType *Array 7783 = Context.getAsConstantArrayType(FieldType); 7784 Array; 7785 Array = Context.getAsConstantArrayType(Array->getElementType())) { 7786 llvm::APInt ArraySize 7787 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 7788 Size *= ArraySize; 7789 } 7790 7791 // Take the address of the field references for "from" and "to". 7792 From = CreateBuiltinUnaryOp(Loc, UO_AddrOf, From.get()); 7793 To = CreateBuiltinUnaryOp(Loc, UO_AddrOf, To.get()); 7794 7795 bool NeedsCollectableMemCpy = 7796 (BaseType->isRecordType() && 7797 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 7798 7799 if (NeedsCollectableMemCpy) { 7800 if (!CollectableMemCpyRef) { 7801 // Create a reference to the __builtin_objc_memmove_collectable function. 7802 LookupResult R(*this, 7803 &Context.Idents.get("__builtin_objc_memmove_collectable"), 7804 Loc, LookupOrdinaryName); 7805 LookupName(R, TUScope, true); 7806 7807 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 7808 if (!CollectableMemCpy) { 7809 // Something went horribly wrong earlier, and we will have 7810 // complained about it. 7811 Invalid = true; 7812 continue; 7813 } 7814 7815 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 7816 CollectableMemCpy->getType(), 7817 VK_LValue, Loc, 0).take(); 7818 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 7819 } 7820 } 7821 // Create a reference to the __builtin_memcpy builtin function. 7822 else if (!BuiltinMemCpyRef) { 7823 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 7824 LookupOrdinaryName); 7825 LookupName(R, TUScope, true); 7826 7827 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 7828 if (!BuiltinMemCpy) { 7829 // Something went horribly wrong earlier, and we will have complained 7830 // about it. 7831 Invalid = true; 7832 continue; 7833 } 7834 7835 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 7836 BuiltinMemCpy->getType(), 7837 VK_LValue, Loc, 0).take(); 7838 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 7839 } 7840 7841 ASTOwningVector<Expr*> CallArgs(*this); 7842 CallArgs.push_back(To.takeAs<Expr>()); 7843 CallArgs.push_back(From.takeAs<Expr>()); 7844 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 7845 ExprResult Call = ExprError(); 7846 if (NeedsCollectableMemCpy) 7847 Call = ActOnCallExpr(/*Scope=*/0, 7848 CollectableMemCpyRef, 7849 Loc, move_arg(CallArgs), 7850 Loc); 7851 else 7852 Call = ActOnCallExpr(/*Scope=*/0, 7853 BuiltinMemCpyRef, 7854 Loc, move_arg(CallArgs), 7855 Loc); 7856 7857 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 7858 Statements.push_back(Call.takeAs<Expr>()); 7859 continue; 7860 } 7861 7862 // Build the copy of this field. 7863 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, FieldType, 7864 To.get(), From.get(), 7865 /*CopyingBaseSubobject=*/false, 7866 /*Copying=*/true); 7867 if (Copy.isInvalid()) { 7868 Diag(CurrentLocation, diag::note_member_synthesized_at) 7869 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7870 CopyAssignOperator->setInvalidDecl(); 7871 return; 7872 } 7873 7874 // Success! Record the copy. 7875 Statements.push_back(Copy.takeAs<Stmt>()); 7876 } 7877 7878 if (!Invalid) { 7879 // Add a "return *this;" 7880 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 7881 7882 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 7883 if (Return.isInvalid()) 7884 Invalid = true; 7885 else { 7886 Statements.push_back(Return.takeAs<Stmt>()); 7887 7888 if (Trap.hasErrorOccurred()) { 7889 Diag(CurrentLocation, diag::note_member_synthesized_at) 7890 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7891 Invalid = true; 7892 } 7893 } 7894 } 7895 7896 if (Invalid) { 7897 CopyAssignOperator->setInvalidDecl(); 7898 return; 7899 } 7900 7901 StmtResult Body; 7902 { 7903 CompoundScopeRAII CompoundScope(*this); 7904 Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 7905 /*isStmtExpr=*/false); 7906 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 7907 } 7908 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 7909 7910 if (ASTMutationListener *L = getASTMutationListener()) { 7911 L->CompletedImplicitDefinition(CopyAssignOperator); 7912 } 7913} 7914 7915Sema::ImplicitExceptionSpecification 7916Sema::ComputeDefaultedMoveAssignmentExceptionSpec(CXXRecordDecl *ClassDecl) { 7917 ImplicitExceptionSpecification ExceptSpec(*this); 7918 7919 if (ClassDecl->isInvalidDecl()) 7920 return ExceptSpec; 7921 7922 // C++0x [except.spec]p14: 7923 // An implicitly declared special member function (Clause 12) shall have an 7924 // exception-specification. [...] 7925 7926 // It is unspecified whether or not an implicit move assignment operator 7927 // attempts to deduplicate calls to assignment operators of virtual bases are 7928 // made. As such, this exception specification is effectively unspecified. 7929 // Based on a similar decision made for constness in C++0x, we're erring on 7930 // the side of assuming such calls to be made regardless of whether they 7931 // actually happen. 7932 // Note that a move constructor is not implicitly declared when there are 7933 // virtual bases, but it can still be user-declared and explicitly defaulted. 7934 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7935 BaseEnd = ClassDecl->bases_end(); 7936 Base != BaseEnd; ++Base) { 7937 if (Base->isVirtual()) 7938 continue; 7939 7940 CXXRecordDecl *BaseClassDecl 7941 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7942 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 7943 false, 0)) 7944 ExceptSpec.CalledDecl(Base->getLocStart(), MoveAssign); 7945 } 7946 7947 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7948 BaseEnd = ClassDecl->vbases_end(); 7949 Base != BaseEnd; ++Base) { 7950 CXXRecordDecl *BaseClassDecl 7951 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7952 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 7953 false, 0)) 7954 ExceptSpec.CalledDecl(Base->getLocStart(), MoveAssign); 7955 } 7956 7957 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7958 FieldEnd = ClassDecl->field_end(); 7959 Field != FieldEnd; 7960 ++Field) { 7961 QualType FieldType = Context.getBaseElementType(Field->getType()); 7962 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7963 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(FieldClassDecl, 7964 false, 0)) 7965 ExceptSpec.CalledDecl(Field->getLocation(), MoveAssign); 7966 } 7967 } 7968 7969 return ExceptSpec; 7970} 7971 7972/// Determine whether the class type has any direct or indirect virtual base 7973/// classes which have a non-trivial move assignment operator. 7974static bool 7975hasVirtualBaseWithNonTrivialMoveAssignment(Sema &S, CXXRecordDecl *ClassDecl) { 7976 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7977 BaseEnd = ClassDecl->vbases_end(); 7978 Base != BaseEnd; ++Base) { 7979 CXXRecordDecl *BaseClass = 7980 cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7981 7982 // Try to declare the move assignment. If it would be deleted, then the 7983 // class does not have a non-trivial move assignment. 7984 if (BaseClass->needsImplicitMoveAssignment()) 7985 S.DeclareImplicitMoveAssignment(BaseClass); 7986 7987 // If the class has both a trivial move assignment and a non-trivial move 7988 // assignment, hasTrivialMoveAssignment() is false. 7989 if (BaseClass->hasDeclaredMoveAssignment() && 7990 !BaseClass->hasTrivialMoveAssignment()) 7991 return true; 7992 } 7993 7994 return false; 7995} 7996 7997/// Determine whether the given type either has a move constructor or is 7998/// trivially copyable. 7999static bool 8000hasMoveOrIsTriviallyCopyable(Sema &S, QualType Type, bool IsConstructor) { 8001 Type = S.Context.getBaseElementType(Type); 8002 8003 // FIXME: Technically, non-trivially-copyable non-class types, such as 8004 // reference types, are supposed to return false here, but that appears 8005 // to be a standard defect. 8006 CXXRecordDecl *ClassDecl = Type->getAsCXXRecordDecl(); 8007 if (!ClassDecl || !ClassDecl->getDefinition()) 8008 return true; 8009 8010 if (Type.isTriviallyCopyableType(S.Context)) 8011 return true; 8012 8013 if (IsConstructor) { 8014 if (ClassDecl->needsImplicitMoveConstructor()) 8015 S.DeclareImplicitMoveConstructor(ClassDecl); 8016 return ClassDecl->hasDeclaredMoveConstructor(); 8017 } 8018 8019 if (ClassDecl->needsImplicitMoveAssignment()) 8020 S.DeclareImplicitMoveAssignment(ClassDecl); 8021 return ClassDecl->hasDeclaredMoveAssignment(); 8022} 8023 8024/// Determine whether all non-static data members and direct or virtual bases 8025/// of class \p ClassDecl have either a move operation, or are trivially 8026/// copyable. 8027static bool subobjectsHaveMoveOrTrivialCopy(Sema &S, CXXRecordDecl *ClassDecl, 8028 bool IsConstructor) { 8029 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8030 BaseEnd = ClassDecl->bases_end(); 8031 Base != BaseEnd; ++Base) { 8032 if (Base->isVirtual()) 8033 continue; 8034 8035 if (!hasMoveOrIsTriviallyCopyable(S, Base->getType(), IsConstructor)) 8036 return false; 8037 } 8038 8039 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8040 BaseEnd = ClassDecl->vbases_end(); 8041 Base != BaseEnd; ++Base) { 8042 if (!hasMoveOrIsTriviallyCopyable(S, Base->getType(), IsConstructor)) 8043 return false; 8044 } 8045 8046 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8047 FieldEnd = ClassDecl->field_end(); 8048 Field != FieldEnd; ++Field) { 8049 if (!hasMoveOrIsTriviallyCopyable(S, Field->getType(), IsConstructor)) 8050 return false; 8051 } 8052 8053 return true; 8054} 8055 8056CXXMethodDecl *Sema::DeclareImplicitMoveAssignment(CXXRecordDecl *ClassDecl) { 8057 // C++11 [class.copy]p20: 8058 // If the definition of a class X does not explicitly declare a move 8059 // assignment operator, one will be implicitly declared as defaulted 8060 // if and only if: 8061 // 8062 // - [first 4 bullets] 8063 assert(ClassDecl->needsImplicitMoveAssignment()); 8064 8065 // [Checked after we build the declaration] 8066 // - the move assignment operator would not be implicitly defined as 8067 // deleted, 8068 8069 // [DR1402]: 8070 // - X has no direct or indirect virtual base class with a non-trivial 8071 // move assignment operator, and 8072 // - each of X's non-static data members and direct or virtual base classes 8073 // has a type that either has a move assignment operator or is trivially 8074 // copyable. 8075 if (hasVirtualBaseWithNonTrivialMoveAssignment(*this, ClassDecl) || 8076 !subobjectsHaveMoveOrTrivialCopy(*this, ClassDecl,/*Constructor*/false)) { 8077 ClassDecl->setFailedImplicitMoveAssignment(); 8078 return 0; 8079 } 8080 8081 // Note: The following rules are largely analoguous to the move 8082 // constructor rules. 8083 8084 ImplicitExceptionSpecification Spec( 8085 ComputeDefaultedMoveAssignmentExceptionSpec(ClassDecl)); 8086 8087 QualType ArgType = Context.getTypeDeclType(ClassDecl); 8088 QualType RetType = Context.getLValueReferenceType(ArgType); 8089 ArgType = Context.getRValueReferenceType(ArgType); 8090 8091 // An implicitly-declared move assignment operator is an inline public 8092 // member of its class. 8093 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 8094 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 8095 SourceLocation ClassLoc = ClassDecl->getLocation(); 8096 DeclarationNameInfo NameInfo(Name, ClassLoc); 8097 CXXMethodDecl *MoveAssignment 8098 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 8099 Context.getFunctionType(RetType, &ArgType, 1, EPI), 8100 /*TInfo=*/0, /*isStatic=*/false, 8101 /*StorageClassAsWritten=*/SC_None, 8102 /*isInline=*/true, 8103 /*isConstexpr=*/false, 8104 SourceLocation()); 8105 MoveAssignment->setAccess(AS_public); 8106 MoveAssignment->setDefaulted(); 8107 MoveAssignment->setImplicit(); 8108 MoveAssignment->setTrivial(ClassDecl->hasTrivialMoveAssignment()); 8109 8110 // Add the parameter to the operator. 8111 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveAssignment, 8112 ClassLoc, ClassLoc, /*Id=*/0, 8113 ArgType, /*TInfo=*/0, 8114 SC_None, 8115 SC_None, 0); 8116 MoveAssignment->setParams(FromParam); 8117 8118 // Note that we have added this copy-assignment operator. 8119 ++ASTContext::NumImplicitMoveAssignmentOperatorsDeclared; 8120 8121 // C++0x [class.copy]p9: 8122 // If the definition of a class X does not explicitly declare a move 8123 // assignment operator, one will be implicitly declared as defaulted if and 8124 // only if: 8125 // [...] 8126 // - the move assignment operator would not be implicitly defined as 8127 // deleted. 8128 if (ShouldDeleteSpecialMember(MoveAssignment, CXXMoveAssignment)) { 8129 // Cache this result so that we don't try to generate this over and over 8130 // on every lookup, leaking memory and wasting time. 8131 ClassDecl->setFailedImplicitMoveAssignment(); 8132 return 0; 8133 } 8134 8135 if (Scope *S = getScopeForContext(ClassDecl)) 8136 PushOnScopeChains(MoveAssignment, S, false); 8137 ClassDecl->addDecl(MoveAssignment); 8138 8139 AddOverriddenMethods(ClassDecl, MoveAssignment); 8140 return MoveAssignment; 8141} 8142 8143void Sema::DefineImplicitMoveAssignment(SourceLocation CurrentLocation, 8144 CXXMethodDecl *MoveAssignOperator) { 8145 assert((MoveAssignOperator->isDefaulted() && 8146 MoveAssignOperator->isOverloadedOperator() && 8147 MoveAssignOperator->getOverloadedOperator() == OO_Equal && 8148 !MoveAssignOperator->doesThisDeclarationHaveABody() && 8149 !MoveAssignOperator->isDeleted()) && 8150 "DefineImplicitMoveAssignment called for wrong function"); 8151 8152 CXXRecordDecl *ClassDecl = MoveAssignOperator->getParent(); 8153 8154 if (ClassDecl->isInvalidDecl() || MoveAssignOperator->isInvalidDecl()) { 8155 MoveAssignOperator->setInvalidDecl(); 8156 return; 8157 } 8158 8159 MoveAssignOperator->setUsed(); 8160 8161 ImplicitlyDefinedFunctionScope Scope(*this, MoveAssignOperator); 8162 DiagnosticErrorTrap Trap(Diags); 8163 8164 // C++0x [class.copy]p28: 8165 // The implicitly-defined or move assignment operator for a non-union class 8166 // X performs memberwise move assignment of its subobjects. The direct base 8167 // classes of X are assigned first, in the order of their declaration in the 8168 // base-specifier-list, and then the immediate non-static data members of X 8169 // are assigned, in the order in which they were declared in the class 8170 // definition. 8171 8172 // The statements that form the synthesized function body. 8173 ASTOwningVector<Stmt*> Statements(*this); 8174 8175 // The parameter for the "other" object, which we are move from. 8176 ParmVarDecl *Other = MoveAssignOperator->getParamDecl(0); 8177 QualType OtherRefType = Other->getType()-> 8178 getAs<RValueReferenceType>()->getPointeeType(); 8179 assert(OtherRefType.getQualifiers() == 0 && 8180 "Bad argument type of defaulted move assignment"); 8181 8182 // Our location for everything implicitly-generated. 8183 SourceLocation Loc = MoveAssignOperator->getLocation(); 8184 8185 // Construct a reference to the "other" object. We'll be using this 8186 // throughout the generated ASTs. 8187 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 8188 assert(OtherRef && "Reference to parameter cannot fail!"); 8189 // Cast to rvalue. 8190 OtherRef = CastForMoving(*this, OtherRef); 8191 8192 // Construct the "this" pointer. We'll be using this throughout the generated 8193 // ASTs. 8194 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 8195 assert(This && "Reference to this cannot fail!"); 8196 8197 // Assign base classes. 8198 bool Invalid = false; 8199 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8200 E = ClassDecl->bases_end(); Base != E; ++Base) { 8201 // Form the assignment: 8202 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&&>(other)); 8203 QualType BaseType = Base->getType().getUnqualifiedType(); 8204 if (!BaseType->isRecordType()) { 8205 Invalid = true; 8206 continue; 8207 } 8208 8209 CXXCastPath BasePath; 8210 BasePath.push_back(Base); 8211 8212 // Construct the "from" expression, which is an implicit cast to the 8213 // appropriately-qualified base type. 8214 Expr *From = OtherRef; 8215 From = ImpCastExprToType(From, BaseType, CK_UncheckedDerivedToBase, 8216 VK_XValue, &BasePath).take(); 8217 8218 // Dereference "this". 8219 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8220 8221 // Implicitly cast "this" to the appropriately-qualified base type. 8222 To = ImpCastExprToType(To.take(), 8223 Context.getCVRQualifiedType(BaseType, 8224 MoveAssignOperator->getTypeQualifiers()), 8225 CK_UncheckedDerivedToBase, 8226 VK_LValue, &BasePath); 8227 8228 // Build the move. 8229 StmtResult Move = BuildSingleCopyAssign(*this, Loc, BaseType, 8230 To.get(), From, 8231 /*CopyingBaseSubobject=*/true, 8232 /*Copying=*/false); 8233 if (Move.isInvalid()) { 8234 Diag(CurrentLocation, diag::note_member_synthesized_at) 8235 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8236 MoveAssignOperator->setInvalidDecl(); 8237 return; 8238 } 8239 8240 // Success! Record the move. 8241 Statements.push_back(Move.takeAs<Expr>()); 8242 } 8243 8244 // \brief Reference to the __builtin_memcpy function. 8245 Expr *BuiltinMemCpyRef = 0; 8246 // \brief Reference to the __builtin_objc_memmove_collectable function. 8247 Expr *CollectableMemCpyRef = 0; 8248 8249 // Assign non-static members. 8250 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8251 FieldEnd = ClassDecl->field_end(); 8252 Field != FieldEnd; ++Field) { 8253 if (Field->isUnnamedBitfield()) 8254 continue; 8255 8256 // Check for members of reference type; we can't move those. 8257 if (Field->getType()->isReferenceType()) { 8258 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8259 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 8260 Diag(Field->getLocation(), diag::note_declared_at); 8261 Diag(CurrentLocation, diag::note_member_synthesized_at) 8262 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8263 Invalid = true; 8264 continue; 8265 } 8266 8267 // Check for members of const-qualified, non-class type. 8268 QualType BaseType = Context.getBaseElementType(Field->getType()); 8269 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 8270 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8271 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 8272 Diag(Field->getLocation(), diag::note_declared_at); 8273 Diag(CurrentLocation, diag::note_member_synthesized_at) 8274 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8275 Invalid = true; 8276 continue; 8277 } 8278 8279 // Suppress assigning zero-width bitfields. 8280 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0) 8281 continue; 8282 8283 QualType FieldType = Field->getType().getNonReferenceType(); 8284 if (FieldType->isIncompleteArrayType()) { 8285 assert(ClassDecl->hasFlexibleArrayMember() && 8286 "Incomplete array type is not valid"); 8287 continue; 8288 } 8289 8290 // Build references to the field in the object we're copying from and to. 8291 CXXScopeSpec SS; // Intentionally empty 8292 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 8293 LookupMemberName); 8294 MemberLookup.addDecl(*Field); 8295 MemberLookup.resolveKind(); 8296 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 8297 Loc, /*IsArrow=*/false, 8298 SS, SourceLocation(), 0, 8299 MemberLookup, 0); 8300 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 8301 Loc, /*IsArrow=*/true, 8302 SS, SourceLocation(), 0, 8303 MemberLookup, 0); 8304 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 8305 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 8306 8307 assert(!From.get()->isLValue() && // could be xvalue or prvalue 8308 "Member reference with rvalue base must be rvalue except for reference " 8309 "members, which aren't allowed for move assignment."); 8310 8311 // If the field should be copied with __builtin_memcpy rather than via 8312 // explicit assignments, do so. This optimization only applies for arrays 8313 // of scalars and arrays of class type with trivial move-assignment 8314 // operators. 8315 if (FieldType->isArrayType() && !FieldType.isVolatileQualified() 8316 && BaseType.hasTrivialAssignment(Context, /*Copying=*/false)) { 8317 // Compute the size of the memory buffer to be copied. 8318 QualType SizeType = Context.getSizeType(); 8319 llvm::APInt Size(Context.getTypeSize(SizeType), 8320 Context.getTypeSizeInChars(BaseType).getQuantity()); 8321 for (const ConstantArrayType *Array 8322 = Context.getAsConstantArrayType(FieldType); 8323 Array; 8324 Array = Context.getAsConstantArrayType(Array->getElementType())) { 8325 llvm::APInt ArraySize 8326 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 8327 Size *= ArraySize; 8328 } 8329 8330 // Take the address of the field references for "from" and "to". We 8331 // directly construct UnaryOperators here because semantic analysis 8332 // does not permit us to take the address of an xvalue. 8333 From = new (Context) UnaryOperator(From.get(), UO_AddrOf, 8334 Context.getPointerType(From.get()->getType()), 8335 VK_RValue, OK_Ordinary, Loc); 8336 To = new (Context) UnaryOperator(To.get(), UO_AddrOf, 8337 Context.getPointerType(To.get()->getType()), 8338 VK_RValue, OK_Ordinary, Loc); 8339 8340 bool NeedsCollectableMemCpy = 8341 (BaseType->isRecordType() && 8342 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 8343 8344 if (NeedsCollectableMemCpy) { 8345 if (!CollectableMemCpyRef) { 8346 // Create a reference to the __builtin_objc_memmove_collectable function. 8347 LookupResult R(*this, 8348 &Context.Idents.get("__builtin_objc_memmove_collectable"), 8349 Loc, LookupOrdinaryName); 8350 LookupName(R, TUScope, true); 8351 8352 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 8353 if (!CollectableMemCpy) { 8354 // Something went horribly wrong earlier, and we will have 8355 // complained about it. 8356 Invalid = true; 8357 continue; 8358 } 8359 8360 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 8361 CollectableMemCpy->getType(), 8362 VK_LValue, Loc, 0).take(); 8363 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 8364 } 8365 } 8366 // Create a reference to the __builtin_memcpy builtin function. 8367 else if (!BuiltinMemCpyRef) { 8368 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 8369 LookupOrdinaryName); 8370 LookupName(R, TUScope, true); 8371 8372 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 8373 if (!BuiltinMemCpy) { 8374 // Something went horribly wrong earlier, and we will have complained 8375 // about it. 8376 Invalid = true; 8377 continue; 8378 } 8379 8380 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 8381 BuiltinMemCpy->getType(), 8382 VK_LValue, Loc, 0).take(); 8383 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 8384 } 8385 8386 ASTOwningVector<Expr*> CallArgs(*this); 8387 CallArgs.push_back(To.takeAs<Expr>()); 8388 CallArgs.push_back(From.takeAs<Expr>()); 8389 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 8390 ExprResult Call = ExprError(); 8391 if (NeedsCollectableMemCpy) 8392 Call = ActOnCallExpr(/*Scope=*/0, 8393 CollectableMemCpyRef, 8394 Loc, move_arg(CallArgs), 8395 Loc); 8396 else 8397 Call = ActOnCallExpr(/*Scope=*/0, 8398 BuiltinMemCpyRef, 8399 Loc, move_arg(CallArgs), 8400 Loc); 8401 8402 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 8403 Statements.push_back(Call.takeAs<Expr>()); 8404 continue; 8405 } 8406 8407 // Build the move of this field. 8408 StmtResult Move = BuildSingleCopyAssign(*this, Loc, FieldType, 8409 To.get(), From.get(), 8410 /*CopyingBaseSubobject=*/false, 8411 /*Copying=*/false); 8412 if (Move.isInvalid()) { 8413 Diag(CurrentLocation, diag::note_member_synthesized_at) 8414 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8415 MoveAssignOperator->setInvalidDecl(); 8416 return; 8417 } 8418 8419 // Success! Record the copy. 8420 Statements.push_back(Move.takeAs<Stmt>()); 8421 } 8422 8423 if (!Invalid) { 8424 // Add a "return *this;" 8425 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8426 8427 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 8428 if (Return.isInvalid()) 8429 Invalid = true; 8430 else { 8431 Statements.push_back(Return.takeAs<Stmt>()); 8432 8433 if (Trap.hasErrorOccurred()) { 8434 Diag(CurrentLocation, diag::note_member_synthesized_at) 8435 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8436 Invalid = true; 8437 } 8438 } 8439 } 8440 8441 if (Invalid) { 8442 MoveAssignOperator->setInvalidDecl(); 8443 return; 8444 } 8445 8446 StmtResult Body; 8447 { 8448 CompoundScopeRAII CompoundScope(*this); 8449 Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 8450 /*isStmtExpr=*/false); 8451 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 8452 } 8453 MoveAssignOperator->setBody(Body.takeAs<Stmt>()); 8454 8455 if (ASTMutationListener *L = getASTMutationListener()) { 8456 L->CompletedImplicitDefinition(MoveAssignOperator); 8457 } 8458} 8459 8460std::pair<Sema::ImplicitExceptionSpecification, bool> 8461Sema::ComputeDefaultedCopyCtorExceptionSpecAndConst(CXXRecordDecl *ClassDecl) { 8462 if (ClassDecl->isInvalidDecl()) 8463 return std::make_pair(ImplicitExceptionSpecification(*this), true); 8464 8465 // C++ [class.copy]p5: 8466 // The implicitly-declared copy constructor for a class X will 8467 // have the form 8468 // 8469 // X::X(const X&) 8470 // 8471 // if 8472 // FIXME: It ought to be possible to store this on the record. 8473 bool HasConstCopyConstructor = true; 8474 8475 // -- each direct or virtual base class B of X has a copy 8476 // constructor whose first parameter is of type const B& or 8477 // const volatile B&, and 8478 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8479 BaseEnd = ClassDecl->bases_end(); 8480 HasConstCopyConstructor && Base != BaseEnd; 8481 ++Base) { 8482 // Virtual bases are handled below. 8483 if (Base->isVirtual()) 8484 continue; 8485 8486 CXXRecordDecl *BaseClassDecl 8487 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8488 HasConstCopyConstructor &= 8489 (bool)LookupCopyingConstructor(BaseClassDecl, Qualifiers::Const); 8490 } 8491 8492 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8493 BaseEnd = ClassDecl->vbases_end(); 8494 HasConstCopyConstructor && Base != BaseEnd; 8495 ++Base) { 8496 CXXRecordDecl *BaseClassDecl 8497 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8498 HasConstCopyConstructor &= 8499 (bool)LookupCopyingConstructor(BaseClassDecl, Qualifiers::Const); 8500 } 8501 8502 // -- for all the nonstatic data members of X that are of a 8503 // class type M (or array thereof), each such class type 8504 // has a copy constructor whose first parameter is of type 8505 // const M& or const volatile M&. 8506 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8507 FieldEnd = ClassDecl->field_end(); 8508 HasConstCopyConstructor && Field != FieldEnd; 8509 ++Field) { 8510 QualType FieldType = Context.getBaseElementType(Field->getType()); 8511 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8512 HasConstCopyConstructor &= 8513 (bool)LookupCopyingConstructor(FieldClassDecl, Qualifiers::Const); 8514 } 8515 } 8516 // Otherwise, the implicitly declared copy constructor will have 8517 // the form 8518 // 8519 // X::X(X&) 8520 8521 // C++ [except.spec]p14: 8522 // An implicitly declared special member function (Clause 12) shall have an 8523 // exception-specification. [...] 8524 ImplicitExceptionSpecification ExceptSpec(*this); 8525 unsigned Quals = HasConstCopyConstructor? Qualifiers::Const : 0; 8526 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8527 BaseEnd = ClassDecl->bases_end(); 8528 Base != BaseEnd; 8529 ++Base) { 8530 // Virtual bases are handled below. 8531 if (Base->isVirtual()) 8532 continue; 8533 8534 CXXRecordDecl *BaseClassDecl 8535 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8536 if (CXXConstructorDecl *CopyConstructor = 8537 LookupCopyingConstructor(BaseClassDecl, Quals)) 8538 ExceptSpec.CalledDecl(Base->getLocStart(), CopyConstructor); 8539 } 8540 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8541 BaseEnd = ClassDecl->vbases_end(); 8542 Base != BaseEnd; 8543 ++Base) { 8544 CXXRecordDecl *BaseClassDecl 8545 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8546 if (CXXConstructorDecl *CopyConstructor = 8547 LookupCopyingConstructor(BaseClassDecl, Quals)) 8548 ExceptSpec.CalledDecl(Base->getLocStart(), CopyConstructor); 8549 } 8550 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8551 FieldEnd = ClassDecl->field_end(); 8552 Field != FieldEnd; 8553 ++Field) { 8554 QualType FieldType = Context.getBaseElementType(Field->getType()); 8555 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8556 if (CXXConstructorDecl *CopyConstructor = 8557 LookupCopyingConstructor(FieldClassDecl, Quals)) 8558 ExceptSpec.CalledDecl(Field->getLocation(), CopyConstructor); 8559 } 8560 } 8561 8562 return std::make_pair(ExceptSpec, HasConstCopyConstructor); 8563} 8564 8565CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 8566 CXXRecordDecl *ClassDecl) { 8567 // C++ [class.copy]p4: 8568 // If the class definition does not explicitly declare a copy 8569 // constructor, one is declared implicitly. 8570 8571 ImplicitExceptionSpecification Spec(*this); 8572 bool Const; 8573 llvm::tie(Spec, Const) = 8574 ComputeDefaultedCopyCtorExceptionSpecAndConst(ClassDecl); 8575 8576 QualType ClassType = Context.getTypeDeclType(ClassDecl); 8577 QualType ArgType = ClassType; 8578 if (Const) 8579 ArgType = ArgType.withConst(); 8580 ArgType = Context.getLValueReferenceType(ArgType); 8581 8582 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 8583 8584 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, 8585 CXXCopyConstructor, 8586 Const); 8587 8588 DeclarationName Name 8589 = Context.DeclarationNames.getCXXConstructorName( 8590 Context.getCanonicalType(ClassType)); 8591 SourceLocation ClassLoc = ClassDecl->getLocation(); 8592 DeclarationNameInfo NameInfo(Name, ClassLoc); 8593 8594 // An implicitly-declared copy constructor is an inline public 8595 // member of its class. 8596 CXXConstructorDecl *CopyConstructor = CXXConstructorDecl::Create( 8597 Context, ClassDecl, ClassLoc, NameInfo, 8598 Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI), /*TInfo=*/0, 8599 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 8600 Constexpr); 8601 CopyConstructor->setAccess(AS_public); 8602 CopyConstructor->setDefaulted(); 8603 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 8604 8605 // Note that we have declared this constructor. 8606 ++ASTContext::NumImplicitCopyConstructorsDeclared; 8607 8608 // Add the parameter to the constructor. 8609 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 8610 ClassLoc, ClassLoc, 8611 /*IdentifierInfo=*/0, 8612 ArgType, /*TInfo=*/0, 8613 SC_None, 8614 SC_None, 0); 8615 CopyConstructor->setParams(FromParam); 8616 8617 if (Scope *S = getScopeForContext(ClassDecl)) 8618 PushOnScopeChains(CopyConstructor, S, false); 8619 ClassDecl->addDecl(CopyConstructor); 8620 8621 // C++11 [class.copy]p8: 8622 // ... If the class definition does not explicitly declare a copy 8623 // constructor, there is no user-declared move constructor, and there is no 8624 // user-declared move assignment operator, a copy constructor is implicitly 8625 // declared as defaulted. 8626 if (ShouldDeleteSpecialMember(CopyConstructor, CXXCopyConstructor)) 8627 CopyConstructor->setDeletedAsWritten(); 8628 8629 return CopyConstructor; 8630} 8631 8632void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 8633 CXXConstructorDecl *CopyConstructor) { 8634 assert((CopyConstructor->isDefaulted() && 8635 CopyConstructor->isCopyConstructor() && 8636 !CopyConstructor->doesThisDeclarationHaveABody() && 8637 !CopyConstructor->isDeleted()) && 8638 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 8639 8640 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 8641 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 8642 8643 ImplicitlyDefinedFunctionScope Scope(*this, CopyConstructor); 8644 DiagnosticErrorTrap Trap(Diags); 8645 8646 if (SetCtorInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) || 8647 Trap.hasErrorOccurred()) { 8648 Diag(CurrentLocation, diag::note_member_synthesized_at) 8649 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 8650 CopyConstructor->setInvalidDecl(); 8651 } else { 8652 Sema::CompoundScopeRAII CompoundScope(*this); 8653 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 8654 CopyConstructor->getLocation(), 8655 MultiStmtArg(*this, 0, 0), 8656 /*isStmtExpr=*/false) 8657 .takeAs<Stmt>()); 8658 CopyConstructor->setImplicitlyDefined(true); 8659 } 8660 8661 CopyConstructor->setUsed(); 8662 if (ASTMutationListener *L = getASTMutationListener()) { 8663 L->CompletedImplicitDefinition(CopyConstructor); 8664 } 8665} 8666 8667Sema::ImplicitExceptionSpecification 8668Sema::ComputeDefaultedMoveCtorExceptionSpec(CXXRecordDecl *ClassDecl) { 8669 // C++ [except.spec]p14: 8670 // An implicitly declared special member function (Clause 12) shall have an 8671 // exception-specification. [...] 8672 ImplicitExceptionSpecification ExceptSpec(*this); 8673 if (ClassDecl->isInvalidDecl()) 8674 return ExceptSpec; 8675 8676 // Direct base-class constructors. 8677 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 8678 BEnd = ClassDecl->bases_end(); 8679 B != BEnd; ++B) { 8680 if (B->isVirtual()) // Handled below. 8681 continue; 8682 8683 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 8684 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 8685 CXXConstructorDecl *Constructor = LookupMovingConstructor(BaseClassDecl); 8686 // If this is a deleted function, add it anyway. This might be conformant 8687 // with the standard. This might not. I'm not sure. It might not matter. 8688 if (Constructor) 8689 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 8690 } 8691 } 8692 8693 // Virtual base-class constructors. 8694 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 8695 BEnd = ClassDecl->vbases_end(); 8696 B != BEnd; ++B) { 8697 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 8698 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 8699 CXXConstructorDecl *Constructor = LookupMovingConstructor(BaseClassDecl); 8700 // If this is a deleted function, add it anyway. This might be conformant 8701 // with the standard. This might not. I'm not sure. It might not matter. 8702 if (Constructor) 8703 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 8704 } 8705 } 8706 8707 // Field constructors. 8708 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 8709 FEnd = ClassDecl->field_end(); 8710 F != FEnd; ++F) { 8711 if (const RecordType *RecordTy 8712 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 8713 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 8714 CXXConstructorDecl *Constructor = LookupMovingConstructor(FieldRecDecl); 8715 // If this is a deleted function, add it anyway. This might be conformant 8716 // with the standard. This might not. I'm not sure. It might not matter. 8717 // In particular, the problem is that this function never gets called. It 8718 // might just be ill-formed because this function attempts to refer to 8719 // a deleted function here. 8720 if (Constructor) 8721 ExceptSpec.CalledDecl(F->getLocation(), Constructor); 8722 } 8723 } 8724 8725 return ExceptSpec; 8726} 8727 8728CXXConstructorDecl *Sema::DeclareImplicitMoveConstructor( 8729 CXXRecordDecl *ClassDecl) { 8730 // C++11 [class.copy]p9: 8731 // If the definition of a class X does not explicitly declare a move 8732 // constructor, one will be implicitly declared as defaulted if and only if: 8733 // 8734 // - [first 4 bullets] 8735 assert(ClassDecl->needsImplicitMoveConstructor()); 8736 8737 // [Checked after we build the declaration] 8738 // - the move assignment operator would not be implicitly defined as 8739 // deleted, 8740 8741 // [DR1402]: 8742 // - each of X's non-static data members and direct or virtual base classes 8743 // has a type that either has a move constructor or is trivially copyable. 8744 if (!subobjectsHaveMoveOrTrivialCopy(*this, ClassDecl, /*Constructor*/true)) { 8745 ClassDecl->setFailedImplicitMoveConstructor(); 8746 return 0; 8747 } 8748 8749 ImplicitExceptionSpecification Spec( 8750 ComputeDefaultedMoveCtorExceptionSpec(ClassDecl)); 8751 8752 QualType ClassType = Context.getTypeDeclType(ClassDecl); 8753 QualType ArgType = Context.getRValueReferenceType(ClassType); 8754 8755 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 8756 8757 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, 8758 CXXMoveConstructor, 8759 false); 8760 8761 DeclarationName Name 8762 = Context.DeclarationNames.getCXXConstructorName( 8763 Context.getCanonicalType(ClassType)); 8764 SourceLocation ClassLoc = ClassDecl->getLocation(); 8765 DeclarationNameInfo NameInfo(Name, ClassLoc); 8766 8767 // C++0x [class.copy]p11: 8768 // An implicitly-declared copy/move constructor is an inline public 8769 // member of its class. 8770 CXXConstructorDecl *MoveConstructor = CXXConstructorDecl::Create( 8771 Context, ClassDecl, ClassLoc, NameInfo, 8772 Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI), /*TInfo=*/0, 8773 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 8774 Constexpr); 8775 MoveConstructor->setAccess(AS_public); 8776 MoveConstructor->setDefaulted(); 8777 MoveConstructor->setTrivial(ClassDecl->hasTrivialMoveConstructor()); 8778 8779 // Add the parameter to the constructor. 8780 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveConstructor, 8781 ClassLoc, ClassLoc, 8782 /*IdentifierInfo=*/0, 8783 ArgType, /*TInfo=*/0, 8784 SC_None, 8785 SC_None, 0); 8786 MoveConstructor->setParams(FromParam); 8787 8788 // C++0x [class.copy]p9: 8789 // If the definition of a class X does not explicitly declare a move 8790 // constructor, one will be implicitly declared as defaulted if and only if: 8791 // [...] 8792 // - the move constructor would not be implicitly defined as deleted. 8793 if (ShouldDeleteSpecialMember(MoveConstructor, CXXMoveConstructor)) { 8794 // Cache this result so that we don't try to generate this over and over 8795 // on every lookup, leaking memory and wasting time. 8796 ClassDecl->setFailedImplicitMoveConstructor(); 8797 return 0; 8798 } 8799 8800 // Note that we have declared this constructor. 8801 ++ASTContext::NumImplicitMoveConstructorsDeclared; 8802 8803 if (Scope *S = getScopeForContext(ClassDecl)) 8804 PushOnScopeChains(MoveConstructor, S, false); 8805 ClassDecl->addDecl(MoveConstructor); 8806 8807 return MoveConstructor; 8808} 8809 8810void Sema::DefineImplicitMoveConstructor(SourceLocation CurrentLocation, 8811 CXXConstructorDecl *MoveConstructor) { 8812 assert((MoveConstructor->isDefaulted() && 8813 MoveConstructor->isMoveConstructor() && 8814 !MoveConstructor->doesThisDeclarationHaveABody() && 8815 !MoveConstructor->isDeleted()) && 8816 "DefineImplicitMoveConstructor - call it for implicit move ctor"); 8817 8818 CXXRecordDecl *ClassDecl = MoveConstructor->getParent(); 8819 assert(ClassDecl && "DefineImplicitMoveConstructor - invalid constructor"); 8820 8821 ImplicitlyDefinedFunctionScope Scope(*this, MoveConstructor); 8822 DiagnosticErrorTrap Trap(Diags); 8823 8824 if (SetCtorInitializers(MoveConstructor, 0, 0, /*AnyErrors=*/false) || 8825 Trap.hasErrorOccurred()) { 8826 Diag(CurrentLocation, diag::note_member_synthesized_at) 8827 << CXXMoveConstructor << Context.getTagDeclType(ClassDecl); 8828 MoveConstructor->setInvalidDecl(); 8829 } else { 8830 Sema::CompoundScopeRAII CompoundScope(*this); 8831 MoveConstructor->setBody(ActOnCompoundStmt(MoveConstructor->getLocation(), 8832 MoveConstructor->getLocation(), 8833 MultiStmtArg(*this, 0, 0), 8834 /*isStmtExpr=*/false) 8835 .takeAs<Stmt>()); 8836 MoveConstructor->setImplicitlyDefined(true); 8837 } 8838 8839 MoveConstructor->setUsed(); 8840 8841 if (ASTMutationListener *L = getASTMutationListener()) { 8842 L->CompletedImplicitDefinition(MoveConstructor); 8843 } 8844} 8845 8846bool Sema::isImplicitlyDeleted(FunctionDecl *FD) { 8847 return FD->isDeleted() && 8848 (FD->isDefaulted() || FD->isImplicit()) && 8849 isa<CXXMethodDecl>(FD); 8850} 8851 8852/// \brief Mark the call operator of the given lambda closure type as "used". 8853static void markLambdaCallOperatorUsed(Sema &S, CXXRecordDecl *Lambda) { 8854 CXXMethodDecl *CallOperator 8855 = cast<CXXMethodDecl>( 8856 *Lambda->lookup( 8857 S.Context.DeclarationNames.getCXXOperatorName(OO_Call)).first); 8858 CallOperator->setReferenced(); 8859 CallOperator->setUsed(); 8860} 8861 8862void Sema::DefineImplicitLambdaToFunctionPointerConversion( 8863 SourceLocation CurrentLocation, 8864 CXXConversionDecl *Conv) 8865{ 8866 CXXRecordDecl *Lambda = Conv->getParent(); 8867 8868 // Make sure that the lambda call operator is marked used. 8869 markLambdaCallOperatorUsed(*this, Lambda); 8870 8871 Conv->setUsed(); 8872 8873 ImplicitlyDefinedFunctionScope Scope(*this, Conv); 8874 DiagnosticErrorTrap Trap(Diags); 8875 8876 // Return the address of the __invoke function. 8877 DeclarationName InvokeName = &Context.Idents.get("__invoke"); 8878 CXXMethodDecl *Invoke 8879 = cast<CXXMethodDecl>(*Lambda->lookup(InvokeName).first); 8880 Expr *FunctionRef = BuildDeclRefExpr(Invoke, Invoke->getType(), 8881 VK_LValue, Conv->getLocation()).take(); 8882 assert(FunctionRef && "Can't refer to __invoke function?"); 8883 Stmt *Return = ActOnReturnStmt(Conv->getLocation(), FunctionRef).take(); 8884 Conv->setBody(new (Context) CompoundStmt(Context, &Return, 1, 8885 Conv->getLocation(), 8886 Conv->getLocation())); 8887 8888 // Fill in the __invoke function with a dummy implementation. IR generation 8889 // will fill in the actual details. 8890 Invoke->setUsed(); 8891 Invoke->setReferenced(); 8892 Invoke->setBody(new (Context) CompoundStmt(Context, 0, 0, Conv->getLocation(), 8893 Conv->getLocation())); 8894 8895 if (ASTMutationListener *L = getASTMutationListener()) { 8896 L->CompletedImplicitDefinition(Conv); 8897 L->CompletedImplicitDefinition(Invoke); 8898 } 8899} 8900 8901void Sema::DefineImplicitLambdaToBlockPointerConversion( 8902 SourceLocation CurrentLocation, 8903 CXXConversionDecl *Conv) 8904{ 8905 Conv->setUsed(); 8906 8907 ImplicitlyDefinedFunctionScope Scope(*this, Conv); 8908 DiagnosticErrorTrap Trap(Diags); 8909 8910 // Copy-initialize the lambda object as needed to capture it. 8911 Expr *This = ActOnCXXThis(CurrentLocation).take(); 8912 Expr *DerefThis =CreateBuiltinUnaryOp(CurrentLocation, UO_Deref, This).take(); 8913 8914 ExprResult BuildBlock = BuildBlockForLambdaConversion(CurrentLocation, 8915 Conv->getLocation(), 8916 Conv, DerefThis); 8917 8918 // If we're not under ARC, make sure we still get the _Block_copy/autorelease 8919 // behavior. Note that only the general conversion function does this 8920 // (since it's unusable otherwise); in the case where we inline the 8921 // block literal, it has block literal lifetime semantics. 8922 if (!BuildBlock.isInvalid() && !getLangOpts().ObjCAutoRefCount) 8923 BuildBlock = ImplicitCastExpr::Create(Context, BuildBlock.get()->getType(), 8924 CK_CopyAndAutoreleaseBlockObject, 8925 BuildBlock.get(), 0, VK_RValue); 8926 8927 if (BuildBlock.isInvalid()) { 8928 Diag(CurrentLocation, diag::note_lambda_to_block_conv); 8929 Conv->setInvalidDecl(); 8930 return; 8931 } 8932 8933 // Create the return statement that returns the block from the conversion 8934 // function. 8935 StmtResult Return = ActOnReturnStmt(Conv->getLocation(), BuildBlock.get()); 8936 if (Return.isInvalid()) { 8937 Diag(CurrentLocation, diag::note_lambda_to_block_conv); 8938 Conv->setInvalidDecl(); 8939 return; 8940 } 8941 8942 // Set the body of the conversion function. 8943 Stmt *ReturnS = Return.take(); 8944 Conv->setBody(new (Context) CompoundStmt(Context, &ReturnS, 1, 8945 Conv->getLocation(), 8946 Conv->getLocation())); 8947 8948 // We're done; notify the mutation listener, if any. 8949 if (ASTMutationListener *L = getASTMutationListener()) { 8950 L->CompletedImplicitDefinition(Conv); 8951 } 8952} 8953 8954/// \brief Determine whether the given list arguments contains exactly one 8955/// "real" (non-default) argument. 8956static bool hasOneRealArgument(MultiExprArg Args) { 8957 switch (Args.size()) { 8958 case 0: 8959 return false; 8960 8961 default: 8962 if (!Args.get()[1]->isDefaultArgument()) 8963 return false; 8964 8965 // fall through 8966 case 1: 8967 return !Args.get()[0]->isDefaultArgument(); 8968 } 8969 8970 return false; 8971} 8972 8973ExprResult 8974Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 8975 CXXConstructorDecl *Constructor, 8976 MultiExprArg ExprArgs, 8977 bool HadMultipleCandidates, 8978 bool RequiresZeroInit, 8979 unsigned ConstructKind, 8980 SourceRange ParenRange) { 8981 bool Elidable = false; 8982 8983 // C++0x [class.copy]p34: 8984 // When certain criteria are met, an implementation is allowed to 8985 // omit the copy/move construction of a class object, even if the 8986 // copy/move constructor and/or destructor for the object have 8987 // side effects. [...] 8988 // - when a temporary class object that has not been bound to a 8989 // reference (12.2) would be copied/moved to a class object 8990 // with the same cv-unqualified type, the copy/move operation 8991 // can be omitted by constructing the temporary object 8992 // directly into the target of the omitted copy/move 8993 if (ConstructKind == CXXConstructExpr::CK_Complete && 8994 Constructor->isCopyOrMoveConstructor() && hasOneRealArgument(ExprArgs)) { 8995 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 8996 Elidable = SubExpr->isTemporaryObject(Context, Constructor->getParent()); 8997 } 8998 8999 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 9000 Elidable, move(ExprArgs), HadMultipleCandidates, 9001 RequiresZeroInit, ConstructKind, ParenRange); 9002} 9003 9004/// BuildCXXConstructExpr - Creates a complete call to a constructor, 9005/// including handling of its default argument expressions. 9006ExprResult 9007Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 9008 CXXConstructorDecl *Constructor, bool Elidable, 9009 MultiExprArg ExprArgs, 9010 bool HadMultipleCandidates, 9011 bool RequiresZeroInit, 9012 unsigned ConstructKind, 9013 SourceRange ParenRange) { 9014 unsigned NumExprs = ExprArgs.size(); 9015 Expr **Exprs = (Expr **)ExprArgs.release(); 9016 9017 for (specific_attr_iterator<NonNullAttr> 9018 i = Constructor->specific_attr_begin<NonNullAttr>(), 9019 e = Constructor->specific_attr_end<NonNullAttr>(); i != e; ++i) { 9020 const NonNullAttr *NonNull = *i; 9021 CheckNonNullArguments(NonNull, ExprArgs.get(), ConstructLoc); 9022 } 9023 9024 MarkFunctionReferenced(ConstructLoc, Constructor); 9025 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 9026 Constructor, Elidable, Exprs, NumExprs, 9027 HadMultipleCandidates, /*FIXME*/false, 9028 RequiresZeroInit, 9029 static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind), 9030 ParenRange)); 9031} 9032 9033bool Sema::InitializeVarWithConstructor(VarDecl *VD, 9034 CXXConstructorDecl *Constructor, 9035 MultiExprArg Exprs, 9036 bool HadMultipleCandidates) { 9037 // FIXME: Provide the correct paren SourceRange when available. 9038 ExprResult TempResult = 9039 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 9040 move(Exprs), HadMultipleCandidates, false, 9041 CXXConstructExpr::CK_Complete, SourceRange()); 9042 if (TempResult.isInvalid()) 9043 return true; 9044 9045 Expr *Temp = TempResult.takeAs<Expr>(); 9046 CheckImplicitConversions(Temp, VD->getLocation()); 9047 MarkFunctionReferenced(VD->getLocation(), Constructor); 9048 Temp = MaybeCreateExprWithCleanups(Temp); 9049 VD->setInit(Temp); 9050 9051 return false; 9052} 9053 9054void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 9055 if (VD->isInvalidDecl()) return; 9056 9057 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 9058 if (ClassDecl->isInvalidDecl()) return; 9059 if (ClassDecl->hasIrrelevantDestructor()) return; 9060 if (ClassDecl->isDependentContext()) return; 9061 9062 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 9063 MarkFunctionReferenced(VD->getLocation(), Destructor); 9064 CheckDestructorAccess(VD->getLocation(), Destructor, 9065 PDiag(diag::err_access_dtor_var) 9066 << VD->getDeclName() 9067 << VD->getType()); 9068 DiagnoseUseOfDecl(Destructor, VD->getLocation()); 9069 9070 if (!VD->hasGlobalStorage()) return; 9071 9072 // Emit warning for non-trivial dtor in global scope (a real global, 9073 // class-static, function-static). 9074 Diag(VD->getLocation(), diag::warn_exit_time_destructor); 9075 9076 // TODO: this should be re-enabled for static locals by !CXAAtExit 9077 if (!VD->isStaticLocal()) 9078 Diag(VD->getLocation(), diag::warn_global_destructor); 9079} 9080 9081/// \brief Given a constructor and the set of arguments provided for the 9082/// constructor, convert the arguments and add any required default arguments 9083/// to form a proper call to this constructor. 9084/// 9085/// \returns true if an error occurred, false otherwise. 9086bool 9087Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 9088 MultiExprArg ArgsPtr, 9089 SourceLocation Loc, 9090 ASTOwningVector<Expr*> &ConvertedArgs, 9091 bool AllowExplicit) { 9092 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 9093 unsigned NumArgs = ArgsPtr.size(); 9094 Expr **Args = (Expr **)ArgsPtr.get(); 9095 9096 const FunctionProtoType *Proto 9097 = Constructor->getType()->getAs<FunctionProtoType>(); 9098 assert(Proto && "Constructor without a prototype?"); 9099 unsigned NumArgsInProto = Proto->getNumArgs(); 9100 9101 // If too few arguments are available, we'll fill in the rest with defaults. 9102 if (NumArgs < NumArgsInProto) 9103 ConvertedArgs.reserve(NumArgsInProto); 9104 else 9105 ConvertedArgs.reserve(NumArgs); 9106 9107 VariadicCallType CallType = 9108 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 9109 SmallVector<Expr *, 8> AllArgs; 9110 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 9111 Proto, 0, Args, NumArgs, AllArgs, 9112 CallType, AllowExplicit); 9113 ConvertedArgs.append(AllArgs.begin(), AllArgs.end()); 9114 9115 DiagnoseSentinelCalls(Constructor, Loc, AllArgs.data(), AllArgs.size()); 9116 9117 // FIXME: Missing call to CheckFunctionCall or equivalent 9118 9119 return Invalid; 9120} 9121 9122static inline bool 9123CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 9124 const FunctionDecl *FnDecl) { 9125 const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext(); 9126 if (isa<NamespaceDecl>(DC)) { 9127 return SemaRef.Diag(FnDecl->getLocation(), 9128 diag::err_operator_new_delete_declared_in_namespace) 9129 << FnDecl->getDeclName(); 9130 } 9131 9132 if (isa<TranslationUnitDecl>(DC) && 9133 FnDecl->getStorageClass() == SC_Static) { 9134 return SemaRef.Diag(FnDecl->getLocation(), 9135 diag::err_operator_new_delete_declared_static) 9136 << FnDecl->getDeclName(); 9137 } 9138 9139 return false; 9140} 9141 9142static inline bool 9143CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 9144 CanQualType ExpectedResultType, 9145 CanQualType ExpectedFirstParamType, 9146 unsigned DependentParamTypeDiag, 9147 unsigned InvalidParamTypeDiag) { 9148 QualType ResultType = 9149 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 9150 9151 // Check that the result type is not dependent. 9152 if (ResultType->isDependentType()) 9153 return SemaRef.Diag(FnDecl->getLocation(), 9154 diag::err_operator_new_delete_dependent_result_type) 9155 << FnDecl->getDeclName() << ExpectedResultType; 9156 9157 // Check that the result type is what we expect. 9158 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 9159 return SemaRef.Diag(FnDecl->getLocation(), 9160 diag::err_operator_new_delete_invalid_result_type) 9161 << FnDecl->getDeclName() << ExpectedResultType; 9162 9163 // A function template must have at least 2 parameters. 9164 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 9165 return SemaRef.Diag(FnDecl->getLocation(), 9166 diag::err_operator_new_delete_template_too_few_parameters) 9167 << FnDecl->getDeclName(); 9168 9169 // The function decl must have at least 1 parameter. 9170 if (FnDecl->getNumParams() == 0) 9171 return SemaRef.Diag(FnDecl->getLocation(), 9172 diag::err_operator_new_delete_too_few_parameters) 9173 << FnDecl->getDeclName(); 9174 9175 // Check the the first parameter type is not dependent. 9176 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 9177 if (FirstParamType->isDependentType()) 9178 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 9179 << FnDecl->getDeclName() << ExpectedFirstParamType; 9180 9181 // Check that the first parameter type is what we expect. 9182 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 9183 ExpectedFirstParamType) 9184 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 9185 << FnDecl->getDeclName() << ExpectedFirstParamType; 9186 9187 return false; 9188} 9189 9190static bool 9191CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 9192 // C++ [basic.stc.dynamic.allocation]p1: 9193 // A program is ill-formed if an allocation function is declared in a 9194 // namespace scope other than global scope or declared static in global 9195 // scope. 9196 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 9197 return true; 9198 9199 CanQualType SizeTy = 9200 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 9201 9202 // C++ [basic.stc.dynamic.allocation]p1: 9203 // The return type shall be void*. The first parameter shall have type 9204 // std::size_t. 9205 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 9206 SizeTy, 9207 diag::err_operator_new_dependent_param_type, 9208 diag::err_operator_new_param_type)) 9209 return true; 9210 9211 // C++ [basic.stc.dynamic.allocation]p1: 9212 // The first parameter shall not have an associated default argument. 9213 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 9214 return SemaRef.Diag(FnDecl->getLocation(), 9215 diag::err_operator_new_default_arg) 9216 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 9217 9218 return false; 9219} 9220 9221static bool 9222CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 9223 // C++ [basic.stc.dynamic.deallocation]p1: 9224 // A program is ill-formed if deallocation functions are declared in a 9225 // namespace scope other than global scope or declared static in global 9226 // scope. 9227 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 9228 return true; 9229 9230 // C++ [basic.stc.dynamic.deallocation]p2: 9231 // Each deallocation function shall return void and its first parameter 9232 // shall be void*. 9233 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 9234 SemaRef.Context.VoidPtrTy, 9235 diag::err_operator_delete_dependent_param_type, 9236 diag::err_operator_delete_param_type)) 9237 return true; 9238 9239 return false; 9240} 9241 9242/// CheckOverloadedOperatorDeclaration - Check whether the declaration 9243/// of this overloaded operator is well-formed. If so, returns false; 9244/// otherwise, emits appropriate diagnostics and returns true. 9245bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 9246 assert(FnDecl && FnDecl->isOverloadedOperator() && 9247 "Expected an overloaded operator declaration"); 9248 9249 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 9250 9251 // C++ [over.oper]p5: 9252 // The allocation and deallocation functions, operator new, 9253 // operator new[], operator delete and operator delete[], are 9254 // described completely in 3.7.3. The attributes and restrictions 9255 // found in the rest of this subclause do not apply to them unless 9256 // explicitly stated in 3.7.3. 9257 if (Op == OO_Delete || Op == OO_Array_Delete) 9258 return CheckOperatorDeleteDeclaration(*this, FnDecl); 9259 9260 if (Op == OO_New || Op == OO_Array_New) 9261 return CheckOperatorNewDeclaration(*this, FnDecl); 9262 9263 // C++ [over.oper]p6: 9264 // An operator function shall either be a non-static member 9265 // function or be a non-member function and have at least one 9266 // parameter whose type is a class, a reference to a class, an 9267 // enumeration, or a reference to an enumeration. 9268 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 9269 if (MethodDecl->isStatic()) 9270 return Diag(FnDecl->getLocation(), 9271 diag::err_operator_overload_static) << FnDecl->getDeclName(); 9272 } else { 9273 bool ClassOrEnumParam = false; 9274 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 9275 ParamEnd = FnDecl->param_end(); 9276 Param != ParamEnd; ++Param) { 9277 QualType ParamType = (*Param)->getType().getNonReferenceType(); 9278 if (ParamType->isDependentType() || ParamType->isRecordType() || 9279 ParamType->isEnumeralType()) { 9280 ClassOrEnumParam = true; 9281 break; 9282 } 9283 } 9284 9285 if (!ClassOrEnumParam) 9286 return Diag(FnDecl->getLocation(), 9287 diag::err_operator_overload_needs_class_or_enum) 9288 << FnDecl->getDeclName(); 9289 } 9290 9291 // C++ [over.oper]p8: 9292 // An operator function cannot have default arguments (8.3.6), 9293 // except where explicitly stated below. 9294 // 9295 // Only the function-call operator allows default arguments 9296 // (C++ [over.call]p1). 9297 if (Op != OO_Call) { 9298 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 9299 Param != FnDecl->param_end(); ++Param) { 9300 if ((*Param)->hasDefaultArg()) 9301 return Diag((*Param)->getLocation(), 9302 diag::err_operator_overload_default_arg) 9303 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 9304 } 9305 } 9306 9307 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 9308 { false, false, false } 9309#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 9310 , { Unary, Binary, MemberOnly } 9311#include "clang/Basic/OperatorKinds.def" 9312 }; 9313 9314 bool CanBeUnaryOperator = OperatorUses[Op][0]; 9315 bool CanBeBinaryOperator = OperatorUses[Op][1]; 9316 bool MustBeMemberOperator = OperatorUses[Op][2]; 9317 9318 // C++ [over.oper]p8: 9319 // [...] Operator functions cannot have more or fewer parameters 9320 // than the number required for the corresponding operator, as 9321 // described in the rest of this subclause. 9322 unsigned NumParams = FnDecl->getNumParams() 9323 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 9324 if (Op != OO_Call && 9325 ((NumParams == 1 && !CanBeUnaryOperator) || 9326 (NumParams == 2 && !CanBeBinaryOperator) || 9327 (NumParams < 1) || (NumParams > 2))) { 9328 // We have the wrong number of parameters. 9329 unsigned ErrorKind; 9330 if (CanBeUnaryOperator && CanBeBinaryOperator) { 9331 ErrorKind = 2; // 2 -> unary or binary. 9332 } else if (CanBeUnaryOperator) { 9333 ErrorKind = 0; // 0 -> unary 9334 } else { 9335 assert(CanBeBinaryOperator && 9336 "All non-call overloaded operators are unary or binary!"); 9337 ErrorKind = 1; // 1 -> binary 9338 } 9339 9340 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 9341 << FnDecl->getDeclName() << NumParams << ErrorKind; 9342 } 9343 9344 // Overloaded operators other than operator() cannot be variadic. 9345 if (Op != OO_Call && 9346 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 9347 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 9348 << FnDecl->getDeclName(); 9349 } 9350 9351 // Some operators must be non-static member functions. 9352 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 9353 return Diag(FnDecl->getLocation(), 9354 diag::err_operator_overload_must_be_member) 9355 << FnDecl->getDeclName(); 9356 } 9357 9358 // C++ [over.inc]p1: 9359 // The user-defined function called operator++ implements the 9360 // prefix and postfix ++ operator. If this function is a member 9361 // function with no parameters, or a non-member function with one 9362 // parameter of class or enumeration type, it defines the prefix 9363 // increment operator ++ for objects of that type. If the function 9364 // is a member function with one parameter (which shall be of type 9365 // int) or a non-member function with two parameters (the second 9366 // of which shall be of type int), it defines the postfix 9367 // increment operator ++ for objects of that type. 9368 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 9369 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 9370 bool ParamIsInt = false; 9371 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 9372 ParamIsInt = BT->getKind() == BuiltinType::Int; 9373 9374 if (!ParamIsInt) 9375 return Diag(LastParam->getLocation(), 9376 diag::err_operator_overload_post_incdec_must_be_int) 9377 << LastParam->getType() << (Op == OO_MinusMinus); 9378 } 9379 9380 return false; 9381} 9382 9383/// CheckLiteralOperatorDeclaration - Check whether the declaration 9384/// of this literal operator function is well-formed. If so, returns 9385/// false; otherwise, emits appropriate diagnostics and returns true. 9386bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 9387 if (isa<CXXMethodDecl>(FnDecl)) { 9388 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 9389 << FnDecl->getDeclName(); 9390 return true; 9391 } 9392 9393 if (FnDecl->isExternC()) { 9394 Diag(FnDecl->getLocation(), diag::err_literal_operator_extern_c); 9395 return true; 9396 } 9397 9398 bool Valid = false; 9399 9400 // This might be the definition of a literal operator template. 9401 FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate(); 9402 // This might be a specialization of a literal operator template. 9403 if (!TpDecl) 9404 TpDecl = FnDecl->getPrimaryTemplate(); 9405 9406 // template <char...> type operator "" name() is the only valid template 9407 // signature, and the only valid signature with no parameters. 9408 if (TpDecl) { 9409 if (FnDecl->param_size() == 0) { 9410 // Must have only one template parameter 9411 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 9412 if (Params->size() == 1) { 9413 NonTypeTemplateParmDecl *PmDecl = 9414 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 9415 9416 // The template parameter must be a char parameter pack. 9417 if (PmDecl && PmDecl->isTemplateParameterPack() && 9418 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 9419 Valid = true; 9420 } 9421 } 9422 } else if (FnDecl->param_size()) { 9423 // Check the first parameter 9424 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 9425 9426 QualType T = (*Param)->getType().getUnqualifiedType(); 9427 9428 // unsigned long long int, long double, and any character type are allowed 9429 // as the only parameters. 9430 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 9431 Context.hasSameType(T, Context.LongDoubleTy) || 9432 Context.hasSameType(T, Context.CharTy) || 9433 Context.hasSameType(T, Context.WCharTy) || 9434 Context.hasSameType(T, Context.Char16Ty) || 9435 Context.hasSameType(T, Context.Char32Ty)) { 9436 if (++Param == FnDecl->param_end()) 9437 Valid = true; 9438 goto FinishedParams; 9439 } 9440 9441 // Otherwise it must be a pointer to const; let's strip those qualifiers. 9442 const PointerType *PT = T->getAs<PointerType>(); 9443 if (!PT) 9444 goto FinishedParams; 9445 T = PT->getPointeeType(); 9446 if (!T.isConstQualified() || T.isVolatileQualified()) 9447 goto FinishedParams; 9448 T = T.getUnqualifiedType(); 9449 9450 // Move on to the second parameter; 9451 ++Param; 9452 9453 // If there is no second parameter, the first must be a const char * 9454 if (Param == FnDecl->param_end()) { 9455 if (Context.hasSameType(T, Context.CharTy)) 9456 Valid = true; 9457 goto FinishedParams; 9458 } 9459 9460 // const char *, const wchar_t*, const char16_t*, and const char32_t* 9461 // are allowed as the first parameter to a two-parameter function 9462 if (!(Context.hasSameType(T, Context.CharTy) || 9463 Context.hasSameType(T, Context.WCharTy) || 9464 Context.hasSameType(T, Context.Char16Ty) || 9465 Context.hasSameType(T, Context.Char32Ty))) 9466 goto FinishedParams; 9467 9468 // The second and final parameter must be an std::size_t 9469 T = (*Param)->getType().getUnqualifiedType(); 9470 if (Context.hasSameType(T, Context.getSizeType()) && 9471 ++Param == FnDecl->param_end()) 9472 Valid = true; 9473 } 9474 9475 // FIXME: This diagnostic is absolutely terrible. 9476FinishedParams: 9477 if (!Valid) { 9478 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 9479 << FnDecl->getDeclName(); 9480 return true; 9481 } 9482 9483 // A parameter-declaration-clause containing a default argument is not 9484 // equivalent to any of the permitted forms. 9485 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 9486 ParamEnd = FnDecl->param_end(); 9487 Param != ParamEnd; ++Param) { 9488 if ((*Param)->hasDefaultArg()) { 9489 Diag((*Param)->getDefaultArgRange().getBegin(), 9490 diag::err_literal_operator_default_argument) 9491 << (*Param)->getDefaultArgRange(); 9492 break; 9493 } 9494 } 9495 9496 StringRef LiteralName 9497 = FnDecl->getDeclName().getCXXLiteralIdentifier()->getName(); 9498 if (LiteralName[0] != '_') { 9499 // C++11 [usrlit.suffix]p1: 9500 // Literal suffix identifiers that do not start with an underscore 9501 // are reserved for future standardization. 9502 Diag(FnDecl->getLocation(), diag::warn_user_literal_reserved); 9503 } 9504 9505 return false; 9506} 9507 9508/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 9509/// linkage specification, including the language and (if present) 9510/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 9511/// the location of the language string literal, which is provided 9512/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 9513/// the '{' brace. Otherwise, this linkage specification does not 9514/// have any braces. 9515Decl *Sema::ActOnStartLinkageSpecification(Scope *S, SourceLocation ExternLoc, 9516 SourceLocation LangLoc, 9517 StringRef Lang, 9518 SourceLocation LBraceLoc) { 9519 LinkageSpecDecl::LanguageIDs Language; 9520 if (Lang == "\"C\"") 9521 Language = LinkageSpecDecl::lang_c; 9522 else if (Lang == "\"C++\"") 9523 Language = LinkageSpecDecl::lang_cxx; 9524 else { 9525 Diag(LangLoc, diag::err_bad_language); 9526 return 0; 9527 } 9528 9529 // FIXME: Add all the various semantics of linkage specifications 9530 9531 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 9532 ExternLoc, LangLoc, Language); 9533 CurContext->addDecl(D); 9534 PushDeclContext(S, D); 9535 return D; 9536} 9537 9538/// ActOnFinishLinkageSpecification - Complete the definition of 9539/// the C++ linkage specification LinkageSpec. If RBraceLoc is 9540/// valid, it's the position of the closing '}' brace in a linkage 9541/// specification that uses braces. 9542Decl *Sema::ActOnFinishLinkageSpecification(Scope *S, 9543 Decl *LinkageSpec, 9544 SourceLocation RBraceLoc) { 9545 if (LinkageSpec) { 9546 if (RBraceLoc.isValid()) { 9547 LinkageSpecDecl* LSDecl = cast<LinkageSpecDecl>(LinkageSpec); 9548 LSDecl->setRBraceLoc(RBraceLoc); 9549 } 9550 PopDeclContext(); 9551 } 9552 return LinkageSpec; 9553} 9554 9555/// \brief Perform semantic analysis for the variable declaration that 9556/// occurs within a C++ catch clause, returning the newly-created 9557/// variable. 9558VarDecl *Sema::BuildExceptionDeclaration(Scope *S, 9559 TypeSourceInfo *TInfo, 9560 SourceLocation StartLoc, 9561 SourceLocation Loc, 9562 IdentifierInfo *Name) { 9563 bool Invalid = false; 9564 QualType ExDeclType = TInfo->getType(); 9565 9566 // Arrays and functions decay. 9567 if (ExDeclType->isArrayType()) 9568 ExDeclType = Context.getArrayDecayedType(ExDeclType); 9569 else if (ExDeclType->isFunctionType()) 9570 ExDeclType = Context.getPointerType(ExDeclType); 9571 9572 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 9573 // The exception-declaration shall not denote a pointer or reference to an 9574 // incomplete type, other than [cv] void*. 9575 // N2844 forbids rvalue references. 9576 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 9577 Diag(Loc, diag::err_catch_rvalue_ref); 9578 Invalid = true; 9579 } 9580 9581 QualType BaseType = ExDeclType; 9582 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 9583 unsigned DK = diag::err_catch_incomplete; 9584 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 9585 BaseType = Ptr->getPointeeType(); 9586 Mode = 1; 9587 DK = diag::err_catch_incomplete_ptr; 9588 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 9589 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 9590 BaseType = Ref->getPointeeType(); 9591 Mode = 2; 9592 DK = diag::err_catch_incomplete_ref; 9593 } 9594 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 9595 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK)) 9596 Invalid = true; 9597 9598 if (!Invalid && !ExDeclType->isDependentType() && 9599 RequireNonAbstractType(Loc, ExDeclType, 9600 diag::err_abstract_type_in_decl, 9601 AbstractVariableType)) 9602 Invalid = true; 9603 9604 // Only the non-fragile NeXT runtime currently supports C++ catches 9605 // of ObjC types, and no runtime supports catching ObjC types by value. 9606 if (!Invalid && getLangOpts().ObjC1) { 9607 QualType T = ExDeclType; 9608 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 9609 T = RT->getPointeeType(); 9610 9611 if (T->isObjCObjectType()) { 9612 Diag(Loc, diag::err_objc_object_catch); 9613 Invalid = true; 9614 } else if (T->isObjCObjectPointerType()) { 9615 if (!getLangOpts().ObjCNonFragileABI) 9616 Diag(Loc, diag::warn_objc_pointer_cxx_catch_fragile); 9617 } 9618 } 9619 9620 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, StartLoc, Loc, Name, 9621 ExDeclType, TInfo, SC_None, SC_None); 9622 ExDecl->setExceptionVariable(true); 9623 9624 // In ARC, infer 'retaining' for variables of retainable type. 9625 if (getLangOpts().ObjCAutoRefCount && inferObjCARCLifetime(ExDecl)) 9626 Invalid = true; 9627 9628 if (!Invalid && !ExDeclType->isDependentType()) { 9629 if (const RecordType *recordType = ExDeclType->getAs<RecordType>()) { 9630 // C++ [except.handle]p16: 9631 // The object declared in an exception-declaration or, if the 9632 // exception-declaration does not specify a name, a temporary (12.2) is 9633 // copy-initialized (8.5) from the exception object. [...] 9634 // The object is destroyed when the handler exits, after the destruction 9635 // of any automatic objects initialized within the handler. 9636 // 9637 // We just pretend to initialize the object with itself, then make sure 9638 // it can be destroyed later. 9639 QualType initType = ExDeclType; 9640 9641 InitializedEntity entity = 9642 InitializedEntity::InitializeVariable(ExDecl); 9643 InitializationKind initKind = 9644 InitializationKind::CreateCopy(Loc, SourceLocation()); 9645 9646 Expr *opaqueValue = 9647 new (Context) OpaqueValueExpr(Loc, initType, VK_LValue, OK_Ordinary); 9648 InitializationSequence sequence(*this, entity, initKind, &opaqueValue, 1); 9649 ExprResult result = sequence.Perform(*this, entity, initKind, 9650 MultiExprArg(&opaqueValue, 1)); 9651 if (result.isInvalid()) 9652 Invalid = true; 9653 else { 9654 // If the constructor used was non-trivial, set this as the 9655 // "initializer". 9656 CXXConstructExpr *construct = cast<CXXConstructExpr>(result.take()); 9657 if (!construct->getConstructor()->isTrivial()) { 9658 Expr *init = MaybeCreateExprWithCleanups(construct); 9659 ExDecl->setInit(init); 9660 } 9661 9662 // And make sure it's destructable. 9663 FinalizeVarWithDestructor(ExDecl, recordType); 9664 } 9665 } 9666 } 9667 9668 if (Invalid) 9669 ExDecl->setInvalidDecl(); 9670 9671 return ExDecl; 9672} 9673 9674/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 9675/// handler. 9676Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 9677 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 9678 bool Invalid = D.isInvalidType(); 9679 9680 // Check for unexpanded parameter packs. 9681 if (TInfo && DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 9682 UPPC_ExceptionType)) { 9683 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 9684 D.getIdentifierLoc()); 9685 Invalid = true; 9686 } 9687 9688 IdentifierInfo *II = D.getIdentifier(); 9689 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 9690 LookupOrdinaryName, 9691 ForRedeclaration)) { 9692 // The scope should be freshly made just for us. There is just no way 9693 // it contains any previous declaration. 9694 assert(!S->isDeclScope(PrevDecl)); 9695 if (PrevDecl->isTemplateParameter()) { 9696 // Maybe we will complain about the shadowed template parameter. 9697 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 9698 PrevDecl = 0; 9699 } 9700 } 9701 9702 if (D.getCXXScopeSpec().isSet() && !Invalid) { 9703 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 9704 << D.getCXXScopeSpec().getRange(); 9705 Invalid = true; 9706 } 9707 9708 VarDecl *ExDecl = BuildExceptionDeclaration(S, TInfo, 9709 D.getLocStart(), 9710 D.getIdentifierLoc(), 9711 D.getIdentifier()); 9712 if (Invalid) 9713 ExDecl->setInvalidDecl(); 9714 9715 // Add the exception declaration into this scope. 9716 if (II) 9717 PushOnScopeChains(ExDecl, S); 9718 else 9719 CurContext->addDecl(ExDecl); 9720 9721 ProcessDeclAttributes(S, ExDecl, D); 9722 return ExDecl; 9723} 9724 9725Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation StaticAssertLoc, 9726 Expr *AssertExpr, 9727 Expr *AssertMessageExpr_, 9728 SourceLocation RParenLoc) { 9729 StringLiteral *AssertMessage = cast<StringLiteral>(AssertMessageExpr_); 9730 9731 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 9732 // In a static_assert-declaration, the constant-expression shall be a 9733 // constant expression that can be contextually converted to bool. 9734 ExprResult Converted = PerformContextuallyConvertToBool(AssertExpr); 9735 if (Converted.isInvalid()) 9736 return 0; 9737 9738 llvm::APSInt Cond; 9739 if (VerifyIntegerConstantExpression(Converted.get(), &Cond, 9740 diag::err_static_assert_expression_is_not_constant, 9741 /*AllowFold=*/false).isInvalid()) 9742 return 0; 9743 9744 if (!Cond) { 9745 llvm::SmallString<256> MsgBuffer; 9746 llvm::raw_svector_ostream Msg(MsgBuffer); 9747 AssertMessage->printPretty(Msg, Context, 0, getPrintingPolicy()); 9748 Diag(StaticAssertLoc, diag::err_static_assert_failed) 9749 << Msg.str() << AssertExpr->getSourceRange(); 9750 } 9751 } 9752 9753 if (DiagnoseUnexpandedParameterPack(AssertExpr, UPPC_StaticAssertExpression)) 9754 return 0; 9755 9756 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, StaticAssertLoc, 9757 AssertExpr, AssertMessage, RParenLoc); 9758 9759 CurContext->addDecl(Decl); 9760 return Decl; 9761} 9762 9763/// \brief Perform semantic analysis of the given friend type declaration. 9764/// 9765/// \returns A friend declaration that. 9766FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation Loc, 9767 SourceLocation FriendLoc, 9768 TypeSourceInfo *TSInfo) { 9769 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 9770 9771 QualType T = TSInfo->getType(); 9772 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 9773 9774 // C++03 [class.friend]p2: 9775 // An elaborated-type-specifier shall be used in a friend declaration 9776 // for a class.* 9777 // 9778 // * The class-key of the elaborated-type-specifier is required. 9779 if (!ActiveTemplateInstantiations.empty()) { 9780 // Do not complain about the form of friend template types during 9781 // template instantiation; we will already have complained when the 9782 // template was declared. 9783 } else if (!T->isElaboratedTypeSpecifier()) { 9784 // If we evaluated the type to a record type, suggest putting 9785 // a tag in front. 9786 if (const RecordType *RT = T->getAs<RecordType>()) { 9787 RecordDecl *RD = RT->getDecl(); 9788 9789 std::string InsertionText = std::string(" ") + RD->getKindName(); 9790 9791 Diag(TypeRange.getBegin(), 9792 getLangOpts().CPlusPlus0x ? 9793 diag::warn_cxx98_compat_unelaborated_friend_type : 9794 diag::ext_unelaborated_friend_type) 9795 << (unsigned) RD->getTagKind() 9796 << T 9797 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 9798 InsertionText); 9799 } else { 9800 Diag(FriendLoc, 9801 getLangOpts().CPlusPlus0x ? 9802 diag::warn_cxx98_compat_nonclass_type_friend : 9803 diag::ext_nonclass_type_friend) 9804 << T 9805 << SourceRange(FriendLoc, TypeRange.getEnd()); 9806 } 9807 } else if (T->getAs<EnumType>()) { 9808 Diag(FriendLoc, 9809 getLangOpts().CPlusPlus0x ? 9810 diag::warn_cxx98_compat_enum_friend : 9811 diag::ext_enum_friend) 9812 << T 9813 << SourceRange(FriendLoc, TypeRange.getEnd()); 9814 } 9815 9816 // C++0x [class.friend]p3: 9817 // If the type specifier in a friend declaration designates a (possibly 9818 // cv-qualified) class type, that class is declared as a friend; otherwise, 9819 // the friend declaration is ignored. 9820 9821 // FIXME: C++0x has some syntactic restrictions on friend type declarations 9822 // in [class.friend]p3 that we do not implement. 9823 9824 return FriendDecl::Create(Context, CurContext, Loc, TSInfo, FriendLoc); 9825} 9826 9827/// Handle a friend tag declaration where the scope specifier was 9828/// templated. 9829Decl *Sema::ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc, 9830 unsigned TagSpec, SourceLocation TagLoc, 9831 CXXScopeSpec &SS, 9832 IdentifierInfo *Name, SourceLocation NameLoc, 9833 AttributeList *Attr, 9834 MultiTemplateParamsArg TempParamLists) { 9835 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 9836 9837 bool isExplicitSpecialization = false; 9838 bool Invalid = false; 9839 9840 if (TemplateParameterList *TemplateParams 9841 = MatchTemplateParametersToScopeSpecifier(TagLoc, NameLoc, SS, 9842 TempParamLists.get(), 9843 TempParamLists.size(), 9844 /*friend*/ true, 9845 isExplicitSpecialization, 9846 Invalid)) { 9847 if (TemplateParams->size() > 0) { 9848 // This is a declaration of a class template. 9849 if (Invalid) 9850 return 0; 9851 9852 return CheckClassTemplate(S, TagSpec, TUK_Friend, TagLoc, 9853 SS, Name, NameLoc, Attr, 9854 TemplateParams, AS_public, 9855 /*ModulePrivateLoc=*/SourceLocation(), 9856 TempParamLists.size() - 1, 9857 (TemplateParameterList**) TempParamLists.release()).take(); 9858 } else { 9859 // The "template<>" header is extraneous. 9860 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 9861 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 9862 isExplicitSpecialization = true; 9863 } 9864 } 9865 9866 if (Invalid) return 0; 9867 9868 bool isAllExplicitSpecializations = true; 9869 for (unsigned I = TempParamLists.size(); I-- > 0; ) { 9870 if (TempParamLists.get()[I]->size()) { 9871 isAllExplicitSpecializations = false; 9872 break; 9873 } 9874 } 9875 9876 // FIXME: don't ignore attributes. 9877 9878 // If it's explicit specializations all the way down, just forget 9879 // about the template header and build an appropriate non-templated 9880 // friend. TODO: for source fidelity, remember the headers. 9881 if (isAllExplicitSpecializations) { 9882 if (SS.isEmpty()) { 9883 bool Owned = false; 9884 bool IsDependent = false; 9885 return ActOnTag(S, TagSpec, TUK_Friend, TagLoc, SS, Name, NameLoc, 9886 Attr, AS_public, 9887 /*ModulePrivateLoc=*/SourceLocation(), 9888 MultiTemplateParamsArg(), Owned, IsDependent, 9889 /*ScopedEnumKWLoc=*/SourceLocation(), 9890 /*ScopedEnumUsesClassTag=*/false, 9891 /*UnderlyingType=*/TypeResult()); 9892 } 9893 9894 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 9895 ElaboratedTypeKeyword Keyword 9896 = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 9897 QualType T = CheckTypenameType(Keyword, TagLoc, QualifierLoc, 9898 *Name, NameLoc); 9899 if (T.isNull()) 9900 return 0; 9901 9902 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 9903 if (isa<DependentNameType>(T)) { 9904 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 9905 TL.setElaboratedKeywordLoc(TagLoc); 9906 TL.setQualifierLoc(QualifierLoc); 9907 TL.setNameLoc(NameLoc); 9908 } else { 9909 ElaboratedTypeLoc TL = cast<ElaboratedTypeLoc>(TSI->getTypeLoc()); 9910 TL.setElaboratedKeywordLoc(TagLoc); 9911 TL.setQualifierLoc(QualifierLoc); 9912 cast<TypeSpecTypeLoc>(TL.getNamedTypeLoc()).setNameLoc(NameLoc); 9913 } 9914 9915 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 9916 TSI, FriendLoc); 9917 Friend->setAccess(AS_public); 9918 CurContext->addDecl(Friend); 9919 return Friend; 9920 } 9921 9922 assert(SS.isNotEmpty() && "valid templated tag with no SS and no direct?"); 9923 9924 9925 9926 // Handle the case of a templated-scope friend class. e.g. 9927 // template <class T> class A<T>::B; 9928 // FIXME: we don't support these right now. 9929 ElaboratedTypeKeyword ETK = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 9930 QualType T = Context.getDependentNameType(ETK, SS.getScopeRep(), Name); 9931 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 9932 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 9933 TL.setElaboratedKeywordLoc(TagLoc); 9934 TL.setQualifierLoc(SS.getWithLocInContext(Context)); 9935 TL.setNameLoc(NameLoc); 9936 9937 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 9938 TSI, FriendLoc); 9939 Friend->setAccess(AS_public); 9940 Friend->setUnsupportedFriend(true); 9941 CurContext->addDecl(Friend); 9942 return Friend; 9943} 9944 9945 9946/// Handle a friend type declaration. This works in tandem with 9947/// ActOnTag. 9948/// 9949/// Notes on friend class templates: 9950/// 9951/// We generally treat friend class declarations as if they were 9952/// declaring a class. So, for example, the elaborated type specifier 9953/// in a friend declaration is required to obey the restrictions of a 9954/// class-head (i.e. no typedefs in the scope chain), template 9955/// parameters are required to match up with simple template-ids, &c. 9956/// However, unlike when declaring a template specialization, it's 9957/// okay to refer to a template specialization without an empty 9958/// template parameter declaration, e.g. 9959/// friend class A<T>::B<unsigned>; 9960/// We permit this as a special case; if there are any template 9961/// parameters present at all, require proper matching, i.e. 9962/// template <> template <class T> friend class A<int>::B; 9963Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 9964 MultiTemplateParamsArg TempParams) { 9965 SourceLocation Loc = DS.getLocStart(); 9966 9967 assert(DS.isFriendSpecified()); 9968 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 9969 9970 // Try to convert the decl specifier to a type. This works for 9971 // friend templates because ActOnTag never produces a ClassTemplateDecl 9972 // for a TUK_Friend. 9973 Declarator TheDeclarator(DS, Declarator::MemberContext); 9974 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 9975 QualType T = TSI->getType(); 9976 if (TheDeclarator.isInvalidType()) 9977 return 0; 9978 9979 if (DiagnoseUnexpandedParameterPack(Loc, TSI, UPPC_FriendDeclaration)) 9980 return 0; 9981 9982 // This is definitely an error in C++98. It's probably meant to 9983 // be forbidden in C++0x, too, but the specification is just 9984 // poorly written. 9985 // 9986 // The problem is with declarations like the following: 9987 // template <T> friend A<T>::foo; 9988 // where deciding whether a class C is a friend or not now hinges 9989 // on whether there exists an instantiation of A that causes 9990 // 'foo' to equal C. There are restrictions on class-heads 9991 // (which we declare (by fiat) elaborated friend declarations to 9992 // be) that makes this tractable. 9993 // 9994 // FIXME: handle "template <> friend class A<T>;", which 9995 // is possibly well-formed? Who even knows? 9996 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 9997 Diag(Loc, diag::err_tagless_friend_type_template) 9998 << DS.getSourceRange(); 9999 return 0; 10000 } 10001 10002 // C++98 [class.friend]p1: A friend of a class is a function 10003 // or class that is not a member of the class . . . 10004 // This is fixed in DR77, which just barely didn't make the C++03 10005 // deadline. It's also a very silly restriction that seriously 10006 // affects inner classes and which nobody else seems to implement; 10007 // thus we never diagnose it, not even in -pedantic. 10008 // 10009 // But note that we could warn about it: it's always useless to 10010 // friend one of your own members (it's not, however, worthless to 10011 // friend a member of an arbitrary specialization of your template). 10012 10013 Decl *D; 10014 if (unsigned NumTempParamLists = TempParams.size()) 10015 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 10016 NumTempParamLists, 10017 TempParams.release(), 10018 TSI, 10019 DS.getFriendSpecLoc()); 10020 else 10021 D = CheckFriendTypeDecl(Loc, DS.getFriendSpecLoc(), TSI); 10022 10023 if (!D) 10024 return 0; 10025 10026 D->setAccess(AS_public); 10027 CurContext->addDecl(D); 10028 10029 return D; 10030} 10031 10032Decl *Sema::ActOnFriendFunctionDecl(Scope *S, Declarator &D, 10033 MultiTemplateParamsArg TemplateParams) { 10034 const DeclSpec &DS = D.getDeclSpec(); 10035 10036 assert(DS.isFriendSpecified()); 10037 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 10038 10039 SourceLocation Loc = D.getIdentifierLoc(); 10040 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 10041 10042 // C++ [class.friend]p1 10043 // A friend of a class is a function or class.... 10044 // Note that this sees through typedefs, which is intended. 10045 // It *doesn't* see through dependent types, which is correct 10046 // according to [temp.arg.type]p3: 10047 // If a declaration acquires a function type through a 10048 // type dependent on a template-parameter and this causes 10049 // a declaration that does not use the syntactic form of a 10050 // function declarator to have a function type, the program 10051 // is ill-formed. 10052 if (!TInfo->getType()->isFunctionType()) { 10053 Diag(Loc, diag::err_unexpected_friend); 10054 10055 // It might be worthwhile to try to recover by creating an 10056 // appropriate declaration. 10057 return 0; 10058 } 10059 10060 // C++ [namespace.memdef]p3 10061 // - If a friend declaration in a non-local class first declares a 10062 // class or function, the friend class or function is a member 10063 // of the innermost enclosing namespace. 10064 // - The name of the friend is not found by simple name lookup 10065 // until a matching declaration is provided in that namespace 10066 // scope (either before or after the class declaration granting 10067 // friendship). 10068 // - If a friend function is called, its name may be found by the 10069 // name lookup that considers functions from namespaces and 10070 // classes associated with the types of the function arguments. 10071 // - When looking for a prior declaration of a class or a function 10072 // declared as a friend, scopes outside the innermost enclosing 10073 // namespace scope are not considered. 10074 10075 CXXScopeSpec &SS = D.getCXXScopeSpec(); 10076 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 10077 DeclarationName Name = NameInfo.getName(); 10078 assert(Name); 10079 10080 // Check for unexpanded parameter packs. 10081 if (DiagnoseUnexpandedParameterPack(Loc, TInfo, UPPC_FriendDeclaration) || 10082 DiagnoseUnexpandedParameterPack(NameInfo, UPPC_FriendDeclaration) || 10083 DiagnoseUnexpandedParameterPack(SS, UPPC_FriendDeclaration)) 10084 return 0; 10085 10086 // The context we found the declaration in, or in which we should 10087 // create the declaration. 10088 DeclContext *DC; 10089 Scope *DCScope = S; 10090 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 10091 ForRedeclaration); 10092 10093 // FIXME: there are different rules in local classes 10094 10095 // There are four cases here. 10096 // - There's no scope specifier, in which case we just go to the 10097 // appropriate scope and look for a function or function template 10098 // there as appropriate. 10099 // Recover from invalid scope qualifiers as if they just weren't there. 10100 if (SS.isInvalid() || !SS.isSet()) { 10101 // C++0x [namespace.memdef]p3: 10102 // If the name in a friend declaration is neither qualified nor 10103 // a template-id and the declaration is a function or an 10104 // elaborated-type-specifier, the lookup to determine whether 10105 // the entity has been previously declared shall not consider 10106 // any scopes outside the innermost enclosing namespace. 10107 // C++0x [class.friend]p11: 10108 // If a friend declaration appears in a local class and the name 10109 // specified is an unqualified name, a prior declaration is 10110 // looked up without considering scopes that are outside the 10111 // innermost enclosing non-class scope. For a friend function 10112 // declaration, if there is no prior declaration, the program is 10113 // ill-formed. 10114 bool isLocal = cast<CXXRecordDecl>(CurContext)->isLocalClass(); 10115 bool isTemplateId = D.getName().getKind() == UnqualifiedId::IK_TemplateId; 10116 10117 // Find the appropriate context according to the above. 10118 DC = CurContext; 10119 while (true) { 10120 // Skip class contexts. If someone can cite chapter and verse 10121 // for this behavior, that would be nice --- it's what GCC and 10122 // EDG do, and it seems like a reasonable intent, but the spec 10123 // really only says that checks for unqualified existing 10124 // declarations should stop at the nearest enclosing namespace, 10125 // not that they should only consider the nearest enclosing 10126 // namespace. 10127 while (DC->isRecord() || DC->isTransparentContext()) 10128 DC = DC->getParent(); 10129 10130 LookupQualifiedName(Previous, DC); 10131 10132 // TODO: decide what we think about using declarations. 10133 if (isLocal || !Previous.empty()) 10134 break; 10135 10136 if (isTemplateId) { 10137 if (isa<TranslationUnitDecl>(DC)) break; 10138 } else { 10139 if (DC->isFileContext()) break; 10140 } 10141 DC = DC->getParent(); 10142 } 10143 10144 // C++ [class.friend]p1: A friend of a class is a function or 10145 // class that is not a member of the class . . . 10146 // C++11 changes this for both friend types and functions. 10147 // Most C++ 98 compilers do seem to give an error here, so 10148 // we do, too. 10149 if (!Previous.empty() && DC->Equals(CurContext)) 10150 Diag(DS.getFriendSpecLoc(), 10151 getLangOpts().CPlusPlus0x ? 10152 diag::warn_cxx98_compat_friend_is_member : 10153 diag::err_friend_is_member); 10154 10155 DCScope = getScopeForDeclContext(S, DC); 10156 10157 // C++ [class.friend]p6: 10158 // A function can be defined in a friend declaration of a class if and 10159 // only if the class is a non-local class (9.8), the function name is 10160 // unqualified, and the function has namespace scope. 10161 if (isLocal && D.isFunctionDefinition()) { 10162 Diag(NameInfo.getBeginLoc(), diag::err_friend_def_in_local_class); 10163 } 10164 10165 // - There's a non-dependent scope specifier, in which case we 10166 // compute it and do a previous lookup there for a function 10167 // or function template. 10168 } else if (!SS.getScopeRep()->isDependent()) { 10169 DC = computeDeclContext(SS); 10170 if (!DC) return 0; 10171 10172 if (RequireCompleteDeclContext(SS, DC)) return 0; 10173 10174 LookupQualifiedName(Previous, DC); 10175 10176 // Ignore things found implicitly in the wrong scope. 10177 // TODO: better diagnostics for this case. Suggesting the right 10178 // qualified scope would be nice... 10179 LookupResult::Filter F = Previous.makeFilter(); 10180 while (F.hasNext()) { 10181 NamedDecl *D = F.next(); 10182 if (!DC->InEnclosingNamespaceSetOf( 10183 D->getDeclContext()->getRedeclContext())) 10184 F.erase(); 10185 } 10186 F.done(); 10187 10188 if (Previous.empty()) { 10189 D.setInvalidType(); 10190 Diag(Loc, diag::err_qualified_friend_not_found) 10191 << Name << TInfo->getType(); 10192 return 0; 10193 } 10194 10195 // C++ [class.friend]p1: A friend of a class is a function or 10196 // class that is not a member of the class . . . 10197 if (DC->Equals(CurContext)) 10198 Diag(DS.getFriendSpecLoc(), 10199 getLangOpts().CPlusPlus0x ? 10200 diag::warn_cxx98_compat_friend_is_member : 10201 diag::err_friend_is_member); 10202 10203 if (D.isFunctionDefinition()) { 10204 // C++ [class.friend]p6: 10205 // A function can be defined in a friend declaration of a class if and 10206 // only if the class is a non-local class (9.8), the function name is 10207 // unqualified, and the function has namespace scope. 10208 SemaDiagnosticBuilder DB 10209 = Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def); 10210 10211 DB << SS.getScopeRep(); 10212 if (DC->isFileContext()) 10213 DB << FixItHint::CreateRemoval(SS.getRange()); 10214 SS.clear(); 10215 } 10216 10217 // - There's a scope specifier that does not match any template 10218 // parameter lists, in which case we use some arbitrary context, 10219 // create a method or method template, and wait for instantiation. 10220 // - There's a scope specifier that does match some template 10221 // parameter lists, which we don't handle right now. 10222 } else { 10223 if (D.isFunctionDefinition()) { 10224 // C++ [class.friend]p6: 10225 // A function can be defined in a friend declaration of a class if and 10226 // only if the class is a non-local class (9.8), the function name is 10227 // unqualified, and the function has namespace scope. 10228 Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def) 10229 << SS.getScopeRep(); 10230 } 10231 10232 DC = CurContext; 10233 assert(isa<CXXRecordDecl>(DC) && "friend declaration not in class?"); 10234 } 10235 10236 if (!DC->isRecord()) { 10237 // This implies that it has to be an operator or function. 10238 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 10239 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 10240 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 10241 Diag(Loc, diag::err_introducing_special_friend) << 10242 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 10243 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 10244 return 0; 10245 } 10246 } 10247 10248 // FIXME: This is an egregious hack to cope with cases where the scope stack 10249 // does not contain the declaration context, i.e., in an out-of-line 10250 // definition of a class. 10251 Scope FakeDCScope(S, Scope::DeclScope, Diags); 10252 if (!DCScope) { 10253 FakeDCScope.setEntity(DC); 10254 DCScope = &FakeDCScope; 10255 } 10256 10257 bool AddToScope = true; 10258 NamedDecl *ND = ActOnFunctionDeclarator(DCScope, D, DC, TInfo, Previous, 10259 move(TemplateParams), AddToScope); 10260 if (!ND) return 0; 10261 10262 assert(ND->getDeclContext() == DC); 10263 assert(ND->getLexicalDeclContext() == CurContext); 10264 10265 // Add the function declaration to the appropriate lookup tables, 10266 // adjusting the redeclarations list as necessary. We don't 10267 // want to do this yet if the friending class is dependent. 10268 // 10269 // Also update the scope-based lookup if the target context's 10270 // lookup context is in lexical scope. 10271 if (!CurContext->isDependentContext()) { 10272 DC = DC->getRedeclContext(); 10273 DC->makeDeclVisibleInContext(ND); 10274 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 10275 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 10276 } 10277 10278 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 10279 D.getIdentifierLoc(), ND, 10280 DS.getFriendSpecLoc()); 10281 FrD->setAccess(AS_public); 10282 CurContext->addDecl(FrD); 10283 10284 if (ND->isInvalidDecl()) 10285 FrD->setInvalidDecl(); 10286 else { 10287 FunctionDecl *FD; 10288 if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(ND)) 10289 FD = FTD->getTemplatedDecl(); 10290 else 10291 FD = cast<FunctionDecl>(ND); 10292 10293 // Mark templated-scope function declarations as unsupported. 10294 if (FD->getNumTemplateParameterLists()) 10295 FrD->setUnsupportedFriend(true); 10296 } 10297 10298 return ND; 10299} 10300 10301void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) { 10302 AdjustDeclIfTemplate(Dcl); 10303 10304 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 10305 if (!Fn) { 10306 Diag(DelLoc, diag::err_deleted_non_function); 10307 return; 10308 } 10309 if (const FunctionDecl *Prev = Fn->getPreviousDecl()) { 10310 Diag(DelLoc, diag::err_deleted_decl_not_first); 10311 Diag(Prev->getLocation(), diag::note_previous_declaration); 10312 // If the declaration wasn't the first, we delete the function anyway for 10313 // recovery. 10314 } 10315 Fn->setDeletedAsWritten(); 10316 10317 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Dcl); 10318 if (!MD) 10319 return; 10320 10321 // A deleted special member function is trivial if the corresponding 10322 // implicitly-declared function would have been. 10323 switch (getSpecialMember(MD)) { 10324 case CXXInvalid: 10325 break; 10326 case CXXDefaultConstructor: 10327 MD->setTrivial(MD->getParent()->hasTrivialDefaultConstructor()); 10328 break; 10329 case CXXCopyConstructor: 10330 MD->setTrivial(MD->getParent()->hasTrivialCopyConstructor()); 10331 break; 10332 case CXXMoveConstructor: 10333 MD->setTrivial(MD->getParent()->hasTrivialMoveConstructor()); 10334 break; 10335 case CXXCopyAssignment: 10336 MD->setTrivial(MD->getParent()->hasTrivialCopyAssignment()); 10337 break; 10338 case CXXMoveAssignment: 10339 MD->setTrivial(MD->getParent()->hasTrivialMoveAssignment()); 10340 break; 10341 case CXXDestructor: 10342 MD->setTrivial(MD->getParent()->hasTrivialDestructor()); 10343 break; 10344 } 10345} 10346 10347void Sema::SetDeclDefaulted(Decl *Dcl, SourceLocation DefaultLoc) { 10348 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Dcl); 10349 10350 if (MD) { 10351 if (MD->getParent()->isDependentType()) { 10352 MD->setDefaulted(); 10353 MD->setExplicitlyDefaulted(); 10354 return; 10355 } 10356 10357 CXXSpecialMember Member = getSpecialMember(MD); 10358 if (Member == CXXInvalid) { 10359 Diag(DefaultLoc, diag::err_default_special_members); 10360 return; 10361 } 10362 10363 MD->setDefaulted(); 10364 MD->setExplicitlyDefaulted(); 10365 10366 // If this definition appears within the record, do the checking when 10367 // the record is complete. 10368 const FunctionDecl *Primary = MD; 10369 if (MD->getTemplatedKind() != FunctionDecl::TK_NonTemplate) 10370 // Find the uninstantiated declaration that actually had the '= default' 10371 // on it. 10372 MD->getTemplateInstantiationPattern()->isDefined(Primary); 10373 10374 if (Primary == Primary->getCanonicalDecl()) 10375 return; 10376 10377 switch (Member) { 10378 case CXXDefaultConstructor: { 10379 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10380 CheckExplicitlyDefaultedSpecialMember(CD); 10381 if (!CD->isInvalidDecl()) 10382 DefineImplicitDefaultConstructor(DefaultLoc, CD); 10383 break; 10384 } 10385 10386 case CXXCopyConstructor: { 10387 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10388 CheckExplicitlyDefaultedSpecialMember(CD); 10389 if (!CD->isInvalidDecl()) 10390 DefineImplicitCopyConstructor(DefaultLoc, CD); 10391 break; 10392 } 10393 10394 case CXXCopyAssignment: { 10395 CheckExplicitlyDefaultedSpecialMember(MD); 10396 if (!MD->isInvalidDecl()) 10397 DefineImplicitCopyAssignment(DefaultLoc, MD); 10398 break; 10399 } 10400 10401 case CXXDestructor: { 10402 CXXDestructorDecl *DD = cast<CXXDestructorDecl>(MD); 10403 CheckExplicitlyDefaultedSpecialMember(DD); 10404 if (!DD->isInvalidDecl()) 10405 DefineImplicitDestructor(DefaultLoc, DD); 10406 break; 10407 } 10408 10409 case CXXMoveConstructor: { 10410 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10411 CheckExplicitlyDefaultedSpecialMember(CD); 10412 if (!CD->isInvalidDecl()) 10413 DefineImplicitMoveConstructor(DefaultLoc, CD); 10414 break; 10415 } 10416 10417 case CXXMoveAssignment: { 10418 CheckExplicitlyDefaultedSpecialMember(MD); 10419 if (!MD->isInvalidDecl()) 10420 DefineImplicitMoveAssignment(DefaultLoc, MD); 10421 break; 10422 } 10423 10424 case CXXInvalid: 10425 llvm_unreachable("Invalid special member."); 10426 } 10427 } else { 10428 Diag(DefaultLoc, diag::err_default_special_members); 10429 } 10430} 10431 10432static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 10433 for (Stmt::child_range CI = S->children(); CI; ++CI) { 10434 Stmt *SubStmt = *CI; 10435 if (!SubStmt) 10436 continue; 10437 if (isa<ReturnStmt>(SubStmt)) 10438 Self.Diag(SubStmt->getLocStart(), 10439 diag::err_return_in_constructor_handler); 10440 if (!isa<Expr>(SubStmt)) 10441 SearchForReturnInStmt(Self, SubStmt); 10442 } 10443} 10444 10445void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 10446 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 10447 CXXCatchStmt *Handler = TryBlock->getHandler(I); 10448 SearchForReturnInStmt(*this, Handler); 10449 } 10450} 10451 10452bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 10453 const CXXMethodDecl *Old) { 10454 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 10455 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 10456 10457 if (Context.hasSameType(NewTy, OldTy) || 10458 NewTy->isDependentType() || OldTy->isDependentType()) 10459 return false; 10460 10461 // Check if the return types are covariant 10462 QualType NewClassTy, OldClassTy; 10463 10464 /// Both types must be pointers or references to classes. 10465 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 10466 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 10467 NewClassTy = NewPT->getPointeeType(); 10468 OldClassTy = OldPT->getPointeeType(); 10469 } 10470 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 10471 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 10472 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 10473 NewClassTy = NewRT->getPointeeType(); 10474 OldClassTy = OldRT->getPointeeType(); 10475 } 10476 } 10477 } 10478 10479 // The return types aren't either both pointers or references to a class type. 10480 if (NewClassTy.isNull()) { 10481 Diag(New->getLocation(), 10482 diag::err_different_return_type_for_overriding_virtual_function) 10483 << New->getDeclName() << NewTy << OldTy; 10484 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10485 10486 return true; 10487 } 10488 10489 // C++ [class.virtual]p6: 10490 // If the return type of D::f differs from the return type of B::f, the 10491 // class type in the return type of D::f shall be complete at the point of 10492 // declaration of D::f or shall be the class type D. 10493 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 10494 if (!RT->isBeingDefined() && 10495 RequireCompleteType(New->getLocation(), NewClassTy, 10496 diag::err_covariant_return_incomplete, 10497 New->getDeclName())) 10498 return true; 10499 } 10500 10501 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 10502 // Check if the new class derives from the old class. 10503 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 10504 Diag(New->getLocation(), 10505 diag::err_covariant_return_not_derived) 10506 << New->getDeclName() << NewTy << OldTy; 10507 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10508 return true; 10509 } 10510 10511 // Check if we the conversion from derived to base is valid. 10512 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 10513 diag::err_covariant_return_inaccessible_base, 10514 diag::err_covariant_return_ambiguous_derived_to_base_conv, 10515 // FIXME: Should this point to the return type? 10516 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 10517 // FIXME: this note won't trigger for delayed access control 10518 // diagnostics, and it's impossible to get an undelayed error 10519 // here from access control during the original parse because 10520 // the ParsingDeclSpec/ParsingDeclarator are still in scope. 10521 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10522 return true; 10523 } 10524 } 10525 10526 // The qualifiers of the return types must be the same. 10527 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 10528 Diag(New->getLocation(), 10529 diag::err_covariant_return_type_different_qualifications) 10530 << New->getDeclName() << NewTy << OldTy; 10531 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10532 return true; 10533 }; 10534 10535 10536 // The new class type must have the same or less qualifiers as the old type. 10537 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 10538 Diag(New->getLocation(), 10539 diag::err_covariant_return_type_class_type_more_qualified) 10540 << New->getDeclName() << NewTy << OldTy; 10541 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10542 return true; 10543 }; 10544 10545 return false; 10546} 10547 10548/// \brief Mark the given method pure. 10549/// 10550/// \param Method the method to be marked pure. 10551/// 10552/// \param InitRange the source range that covers the "0" initializer. 10553bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 10554 SourceLocation EndLoc = InitRange.getEnd(); 10555 if (EndLoc.isValid()) 10556 Method->setRangeEnd(EndLoc); 10557 10558 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 10559 Method->setPure(); 10560 return false; 10561 } 10562 10563 if (!Method->isInvalidDecl()) 10564 Diag(Method->getLocation(), diag::err_non_virtual_pure) 10565 << Method->getDeclName() << InitRange; 10566 return true; 10567} 10568 10569/// \brief Determine whether the given declaration is a static data member. 10570static bool isStaticDataMember(Decl *D) { 10571 VarDecl *Var = dyn_cast_or_null<VarDecl>(D); 10572 if (!Var) 10573 return false; 10574 10575 return Var->isStaticDataMember(); 10576} 10577/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 10578/// an initializer for the out-of-line declaration 'Dcl'. The scope 10579/// is a fresh scope pushed for just this purpose. 10580/// 10581/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 10582/// static data member of class X, names should be looked up in the scope of 10583/// class X. 10584void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) { 10585 // If there is no declaration, there was an error parsing it. 10586 if (D == 0 || D->isInvalidDecl()) return; 10587 10588 // We should only get called for declarations with scope specifiers, like: 10589 // int foo::bar; 10590 assert(D->isOutOfLine()); 10591 EnterDeclaratorContext(S, D->getDeclContext()); 10592 10593 // If we are parsing the initializer for a static data member, push a 10594 // new expression evaluation context that is associated with this static 10595 // data member. 10596 if (isStaticDataMember(D)) 10597 PushExpressionEvaluationContext(PotentiallyEvaluated, D); 10598} 10599 10600/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 10601/// initializer for the out-of-line declaration 'D'. 10602void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) { 10603 // If there is no declaration, there was an error parsing it. 10604 if (D == 0 || D->isInvalidDecl()) return; 10605 10606 if (isStaticDataMember(D)) 10607 PopExpressionEvaluationContext(); 10608 10609 assert(D->isOutOfLine()); 10610 ExitDeclaratorContext(S); 10611} 10612 10613/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 10614/// C++ if/switch/while/for statement. 10615/// e.g: "if (int x = f()) {...}" 10616DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 10617 // C++ 6.4p2: 10618 // The declarator shall not specify a function or an array. 10619 // The type-specifier-seq shall not contain typedef and shall not declare a 10620 // new class or enumeration. 10621 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 10622 "Parser allowed 'typedef' as storage class of condition decl."); 10623 10624 Decl *Dcl = ActOnDeclarator(S, D); 10625 if (!Dcl) 10626 return true; 10627 10628 if (isa<FunctionDecl>(Dcl)) { // The declarator shall not specify a function. 10629 Diag(Dcl->getLocation(), diag::err_invalid_use_of_function_type) 10630 << D.getSourceRange(); 10631 return true; 10632 } 10633 10634 return Dcl; 10635} 10636 10637void Sema::LoadExternalVTableUses() { 10638 if (!ExternalSource) 10639 return; 10640 10641 SmallVector<ExternalVTableUse, 4> VTables; 10642 ExternalSource->ReadUsedVTables(VTables); 10643 SmallVector<VTableUse, 4> NewUses; 10644 for (unsigned I = 0, N = VTables.size(); I != N; ++I) { 10645 llvm::DenseMap<CXXRecordDecl *, bool>::iterator Pos 10646 = VTablesUsed.find(VTables[I].Record); 10647 // Even if a definition wasn't required before, it may be required now. 10648 if (Pos != VTablesUsed.end()) { 10649 if (!Pos->second && VTables[I].DefinitionRequired) 10650 Pos->second = true; 10651 continue; 10652 } 10653 10654 VTablesUsed[VTables[I].Record] = VTables[I].DefinitionRequired; 10655 NewUses.push_back(VTableUse(VTables[I].Record, VTables[I].Location)); 10656 } 10657 10658 VTableUses.insert(VTableUses.begin(), NewUses.begin(), NewUses.end()); 10659} 10660 10661void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 10662 bool DefinitionRequired) { 10663 // Ignore any vtable uses in unevaluated operands or for classes that do 10664 // not have a vtable. 10665 if (!Class->isDynamicClass() || Class->isDependentContext() || 10666 CurContext->isDependentContext() || 10667 ExprEvalContexts.back().Context == Unevaluated) 10668 return; 10669 10670 // Try to insert this class into the map. 10671 LoadExternalVTableUses(); 10672 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 10673 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 10674 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 10675 if (!Pos.second) { 10676 // If we already had an entry, check to see if we are promoting this vtable 10677 // to required a definition. If so, we need to reappend to the VTableUses 10678 // list, since we may have already processed the first entry. 10679 if (DefinitionRequired && !Pos.first->second) { 10680 Pos.first->second = true; 10681 } else { 10682 // Otherwise, we can early exit. 10683 return; 10684 } 10685 } 10686 10687 // Local classes need to have their virtual members marked 10688 // immediately. For all other classes, we mark their virtual members 10689 // at the end of the translation unit. 10690 if (Class->isLocalClass()) 10691 MarkVirtualMembersReferenced(Loc, Class); 10692 else 10693 VTableUses.push_back(std::make_pair(Class, Loc)); 10694} 10695 10696bool Sema::DefineUsedVTables() { 10697 LoadExternalVTableUses(); 10698 if (VTableUses.empty()) 10699 return false; 10700 10701 // Note: The VTableUses vector could grow as a result of marking 10702 // the members of a class as "used", so we check the size each 10703 // time through the loop and prefer indices (with are stable) to 10704 // iterators (which are not). 10705 bool DefinedAnything = false; 10706 for (unsigned I = 0; I != VTableUses.size(); ++I) { 10707 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 10708 if (!Class) 10709 continue; 10710 10711 SourceLocation Loc = VTableUses[I].second; 10712 10713 // If this class has a key function, but that key function is 10714 // defined in another translation unit, we don't need to emit the 10715 // vtable even though we're using it. 10716 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class); 10717 if (KeyFunction && !KeyFunction->hasBody()) { 10718 switch (KeyFunction->getTemplateSpecializationKind()) { 10719 case TSK_Undeclared: 10720 case TSK_ExplicitSpecialization: 10721 case TSK_ExplicitInstantiationDeclaration: 10722 // The key function is in another translation unit. 10723 continue; 10724 10725 case TSK_ExplicitInstantiationDefinition: 10726 case TSK_ImplicitInstantiation: 10727 // We will be instantiating the key function. 10728 break; 10729 } 10730 } else if (!KeyFunction) { 10731 // If we have a class with no key function that is the subject 10732 // of an explicit instantiation declaration, suppress the 10733 // vtable; it will live with the explicit instantiation 10734 // definition. 10735 bool IsExplicitInstantiationDeclaration 10736 = Class->getTemplateSpecializationKind() 10737 == TSK_ExplicitInstantiationDeclaration; 10738 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 10739 REnd = Class->redecls_end(); 10740 R != REnd; ++R) { 10741 TemplateSpecializationKind TSK 10742 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 10743 if (TSK == TSK_ExplicitInstantiationDeclaration) 10744 IsExplicitInstantiationDeclaration = true; 10745 else if (TSK == TSK_ExplicitInstantiationDefinition) { 10746 IsExplicitInstantiationDeclaration = false; 10747 break; 10748 } 10749 } 10750 10751 if (IsExplicitInstantiationDeclaration) 10752 continue; 10753 } 10754 10755 // Mark all of the virtual members of this class as referenced, so 10756 // that we can build a vtable. Then, tell the AST consumer that a 10757 // vtable for this class is required. 10758 DefinedAnything = true; 10759 MarkVirtualMembersReferenced(Loc, Class); 10760 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 10761 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 10762 10763 // Optionally warn if we're emitting a weak vtable. 10764 if (Class->getLinkage() == ExternalLinkage && 10765 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 10766 const FunctionDecl *KeyFunctionDef = 0; 10767 if (!KeyFunction || 10768 (KeyFunction->hasBody(KeyFunctionDef) && 10769 KeyFunctionDef->isInlined())) 10770 Diag(Class->getLocation(), Class->getTemplateSpecializationKind() == 10771 TSK_ExplicitInstantiationDefinition 10772 ? diag::warn_weak_template_vtable : diag::warn_weak_vtable) 10773 << Class; 10774 } 10775 } 10776 VTableUses.clear(); 10777 10778 return DefinedAnything; 10779} 10780 10781void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 10782 const CXXRecordDecl *RD) { 10783 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 10784 e = RD->method_end(); i != e; ++i) { 10785 CXXMethodDecl *MD = *i; 10786 10787 // C++ [basic.def.odr]p2: 10788 // [...] A virtual member function is used if it is not pure. [...] 10789 if (MD->isVirtual() && !MD->isPure()) 10790 MarkFunctionReferenced(Loc, MD); 10791 } 10792 10793 // Only classes that have virtual bases need a VTT. 10794 if (RD->getNumVBases() == 0) 10795 return; 10796 10797 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 10798 e = RD->bases_end(); i != e; ++i) { 10799 const CXXRecordDecl *Base = 10800 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 10801 if (Base->getNumVBases() == 0) 10802 continue; 10803 MarkVirtualMembersReferenced(Loc, Base); 10804 } 10805} 10806 10807/// SetIvarInitializers - This routine builds initialization ASTs for the 10808/// Objective-C implementation whose ivars need be initialized. 10809void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 10810 if (!getLangOpts().CPlusPlus) 10811 return; 10812 if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 10813 SmallVector<ObjCIvarDecl*, 8> ivars; 10814 CollectIvarsToConstructOrDestruct(OID, ivars); 10815 if (ivars.empty()) 10816 return; 10817 SmallVector<CXXCtorInitializer*, 32> AllToInit; 10818 for (unsigned i = 0; i < ivars.size(); i++) { 10819 FieldDecl *Field = ivars[i]; 10820 if (Field->isInvalidDecl()) 10821 continue; 10822 10823 CXXCtorInitializer *Member; 10824 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 10825 InitializationKind InitKind = 10826 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 10827 10828 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 10829 ExprResult MemberInit = 10830 InitSeq.Perform(*this, InitEntity, InitKind, MultiExprArg()); 10831 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 10832 // Note, MemberInit could actually come back empty if no initialization 10833 // is required (e.g., because it would call a trivial default constructor) 10834 if (!MemberInit.get() || MemberInit.isInvalid()) 10835 continue; 10836 10837 Member = 10838 new (Context) CXXCtorInitializer(Context, Field, SourceLocation(), 10839 SourceLocation(), 10840 MemberInit.takeAs<Expr>(), 10841 SourceLocation()); 10842 AllToInit.push_back(Member); 10843 10844 // Be sure that the destructor is accessible and is marked as referenced. 10845 if (const RecordType *RecordTy 10846 = Context.getBaseElementType(Field->getType()) 10847 ->getAs<RecordType>()) { 10848 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 10849 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 10850 MarkFunctionReferenced(Field->getLocation(), Destructor); 10851 CheckDestructorAccess(Field->getLocation(), Destructor, 10852 PDiag(diag::err_access_dtor_ivar) 10853 << Context.getBaseElementType(Field->getType())); 10854 } 10855 } 10856 } 10857 ObjCImplementation->setIvarInitializers(Context, 10858 AllToInit.data(), AllToInit.size()); 10859 } 10860} 10861 10862static 10863void DelegatingCycleHelper(CXXConstructorDecl* Ctor, 10864 llvm::SmallSet<CXXConstructorDecl*, 4> &Valid, 10865 llvm::SmallSet<CXXConstructorDecl*, 4> &Invalid, 10866 llvm::SmallSet<CXXConstructorDecl*, 4> &Current, 10867 Sema &S) { 10868 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 10869 CE = Current.end(); 10870 if (Ctor->isInvalidDecl()) 10871 return; 10872 10873 const FunctionDecl *FNTarget = 0; 10874 CXXConstructorDecl *Target; 10875 10876 // We ignore the result here since if we don't have a body, Target will be 10877 // null below. 10878 (void)Ctor->getTargetConstructor()->hasBody(FNTarget); 10879 Target 10880= const_cast<CXXConstructorDecl*>(cast_or_null<CXXConstructorDecl>(FNTarget)); 10881 10882 CXXConstructorDecl *Canonical = Ctor->getCanonicalDecl(), 10883 // Avoid dereferencing a null pointer here. 10884 *TCanonical = Target ? Target->getCanonicalDecl() : 0; 10885 10886 if (!Current.insert(Canonical)) 10887 return; 10888 10889 // We know that beyond here, we aren't chaining into a cycle. 10890 if (!Target || !Target->isDelegatingConstructor() || 10891 Target->isInvalidDecl() || Valid.count(TCanonical)) { 10892 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 10893 Valid.insert(*CI); 10894 Current.clear(); 10895 // We've hit a cycle. 10896 } else if (TCanonical == Canonical || Invalid.count(TCanonical) || 10897 Current.count(TCanonical)) { 10898 // If we haven't diagnosed this cycle yet, do so now. 10899 if (!Invalid.count(TCanonical)) { 10900 S.Diag((*Ctor->init_begin())->getSourceLocation(), 10901 diag::warn_delegating_ctor_cycle) 10902 << Ctor; 10903 10904 // Don't add a note for a function delegating directo to itself. 10905 if (TCanonical != Canonical) 10906 S.Diag(Target->getLocation(), diag::note_it_delegates_to); 10907 10908 CXXConstructorDecl *C = Target; 10909 while (C->getCanonicalDecl() != Canonical) { 10910 (void)C->getTargetConstructor()->hasBody(FNTarget); 10911 assert(FNTarget && "Ctor cycle through bodiless function"); 10912 10913 C 10914 = const_cast<CXXConstructorDecl*>(cast<CXXConstructorDecl>(FNTarget)); 10915 S.Diag(C->getLocation(), diag::note_which_delegates_to); 10916 } 10917 } 10918 10919 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 10920 Invalid.insert(*CI); 10921 Current.clear(); 10922 } else { 10923 DelegatingCycleHelper(Target, Valid, Invalid, Current, S); 10924 } 10925} 10926 10927 10928void Sema::CheckDelegatingCtorCycles() { 10929 llvm::SmallSet<CXXConstructorDecl*, 4> Valid, Invalid, Current; 10930 10931 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 10932 CE = Current.end(); 10933 10934 for (DelegatingCtorDeclsType::iterator 10935 I = DelegatingCtorDecls.begin(ExternalSource), 10936 E = DelegatingCtorDecls.end(); 10937 I != E; ++I) { 10938 DelegatingCycleHelper(*I, Valid, Invalid, Current, *this); 10939 } 10940 10941 for (CI = Invalid.begin(), CE = Invalid.end(); CI != CE; ++CI) 10942 (*CI)->setInvalidDecl(); 10943} 10944 10945namespace { 10946 /// \brief AST visitor that finds references to the 'this' expression. 10947 class FindCXXThisExpr : public RecursiveASTVisitor<FindCXXThisExpr> { 10948 Sema &S; 10949 10950 public: 10951 explicit FindCXXThisExpr(Sema &S) : S(S) { } 10952 10953 bool VisitCXXThisExpr(CXXThisExpr *E) { 10954 S.Diag(E->getLocation(), diag::err_this_static_member_func) 10955 << E->isImplicit(); 10956 return false; 10957 } 10958 }; 10959} 10960 10961bool Sema::checkThisInStaticMemberFunctionType(CXXMethodDecl *Method) { 10962 TypeSourceInfo *TSInfo = Method->getTypeSourceInfo(); 10963 if (!TSInfo) 10964 return false; 10965 10966 TypeLoc TL = TSInfo->getTypeLoc(); 10967 FunctionProtoTypeLoc *ProtoTL = dyn_cast<FunctionProtoTypeLoc>(&TL); 10968 if (!ProtoTL) 10969 return false; 10970 10971 // C++11 [expr.prim.general]p3: 10972 // [The expression this] shall not appear before the optional 10973 // cv-qualifier-seq and it shall not appear within the declaration of a 10974 // static member function (although its type and value category are defined 10975 // within a static member function as they are within a non-static member 10976 // function). [ Note: this is because declaration matching does not occur 10977 // until the complete declarator is known. - end note ] 10978 const FunctionProtoType *Proto = ProtoTL->getTypePtr(); 10979 FindCXXThisExpr Finder(*this); 10980 10981 // If the return type came after the cv-qualifier-seq, check it now. 10982 if (Proto->hasTrailingReturn() && 10983 !Finder.TraverseTypeLoc(ProtoTL->getResultLoc())) 10984 return true; 10985 10986 // Check the exception specification. 10987 if (checkThisInStaticMemberFunctionExceptionSpec(Method)) 10988 return true; 10989 10990 return checkThisInStaticMemberFunctionAttributes(Method); 10991} 10992 10993bool Sema::checkThisInStaticMemberFunctionExceptionSpec(CXXMethodDecl *Method) { 10994 TypeSourceInfo *TSInfo = Method->getTypeSourceInfo(); 10995 if (!TSInfo) 10996 return false; 10997 10998 TypeLoc TL = TSInfo->getTypeLoc(); 10999 FunctionProtoTypeLoc *ProtoTL = dyn_cast<FunctionProtoTypeLoc>(&TL); 11000 if (!ProtoTL) 11001 return false; 11002 11003 const FunctionProtoType *Proto = ProtoTL->getTypePtr(); 11004 FindCXXThisExpr Finder(*this); 11005 11006 switch (Proto->getExceptionSpecType()) { 11007 case EST_Uninstantiated: 11008 case EST_BasicNoexcept: 11009 case EST_Delayed: 11010 case EST_DynamicNone: 11011 case EST_MSAny: 11012 case EST_None: 11013 break; 11014 11015 case EST_ComputedNoexcept: 11016 if (!Finder.TraverseStmt(Proto->getNoexceptExpr())) 11017 return true; 11018 11019 case EST_Dynamic: 11020 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(), 11021 EEnd = Proto->exception_end(); 11022 E != EEnd; ++E) { 11023 if (!Finder.TraverseType(*E)) 11024 return true; 11025 } 11026 break; 11027 } 11028 11029 return false; 11030} 11031 11032bool Sema::checkThisInStaticMemberFunctionAttributes(CXXMethodDecl *Method) { 11033 FindCXXThisExpr Finder(*this); 11034 11035 // Check attributes. 11036 for (Decl::attr_iterator A = Method->attr_begin(), AEnd = Method->attr_end(); 11037 A != AEnd; ++A) { 11038 // FIXME: This should be emitted by tblgen. 11039 Expr *Arg = 0; 11040 ArrayRef<Expr *> Args; 11041 if (GuardedByAttr *G = dyn_cast<GuardedByAttr>(*A)) 11042 Arg = G->getArg(); 11043 else if (PtGuardedByAttr *G = dyn_cast<PtGuardedByAttr>(*A)) 11044 Arg = G->getArg(); 11045 else if (AcquiredAfterAttr *AA = dyn_cast<AcquiredAfterAttr>(*A)) 11046 Args = ArrayRef<Expr *>(AA->args_begin(), AA->args_size()); 11047 else if (AcquiredBeforeAttr *AB = dyn_cast<AcquiredBeforeAttr>(*A)) 11048 Args = ArrayRef<Expr *>(AB->args_begin(), AB->args_size()); 11049 else if (ExclusiveLockFunctionAttr *ELF 11050 = dyn_cast<ExclusiveLockFunctionAttr>(*A)) 11051 Args = ArrayRef<Expr *>(ELF->args_begin(), ELF->args_size()); 11052 else if (SharedLockFunctionAttr *SLF 11053 = dyn_cast<SharedLockFunctionAttr>(*A)) 11054 Args = ArrayRef<Expr *>(SLF->args_begin(), SLF->args_size()); 11055 else if (ExclusiveTrylockFunctionAttr *ETLF 11056 = dyn_cast<ExclusiveTrylockFunctionAttr>(*A)) { 11057 Arg = ETLF->getSuccessValue(); 11058 Args = ArrayRef<Expr *>(ETLF->args_begin(), ETLF->args_size()); 11059 } else if (SharedTrylockFunctionAttr *STLF 11060 = dyn_cast<SharedTrylockFunctionAttr>(*A)) { 11061 Arg = STLF->getSuccessValue(); 11062 Args = ArrayRef<Expr *>(STLF->args_begin(), STLF->args_size()); 11063 } else if (UnlockFunctionAttr *UF = dyn_cast<UnlockFunctionAttr>(*A)) 11064 Args = ArrayRef<Expr *>(UF->args_begin(), UF->args_size()); 11065 else if (LockReturnedAttr *LR = dyn_cast<LockReturnedAttr>(*A)) 11066 Arg = LR->getArg(); 11067 else if (LocksExcludedAttr *LE = dyn_cast<LocksExcludedAttr>(*A)) 11068 Args = ArrayRef<Expr *>(LE->args_begin(), LE->args_size()); 11069 else if (ExclusiveLocksRequiredAttr *ELR 11070 = dyn_cast<ExclusiveLocksRequiredAttr>(*A)) 11071 Args = ArrayRef<Expr *>(ELR->args_begin(), ELR->args_size()); 11072 else if (SharedLocksRequiredAttr *SLR 11073 = dyn_cast<SharedLocksRequiredAttr>(*A)) 11074 Args = ArrayRef<Expr *>(SLR->args_begin(), SLR->args_size()); 11075 11076 if (Arg && !Finder.TraverseStmt(Arg)) 11077 return true; 11078 11079 for (unsigned I = 0, N = Args.size(); I != N; ++I) { 11080 if (!Finder.TraverseStmt(Args[I])) 11081 return true; 11082 } 11083 } 11084 11085 return false; 11086} 11087 11088void 11089Sema::checkExceptionSpecification(ExceptionSpecificationType EST, 11090 ArrayRef<ParsedType> DynamicExceptions, 11091 ArrayRef<SourceRange> DynamicExceptionRanges, 11092 Expr *NoexceptExpr, 11093 llvm::SmallVectorImpl<QualType> &Exceptions, 11094 FunctionProtoType::ExtProtoInfo &EPI) { 11095 Exceptions.clear(); 11096 EPI.ExceptionSpecType = EST; 11097 if (EST == EST_Dynamic) { 11098 Exceptions.reserve(DynamicExceptions.size()); 11099 for (unsigned ei = 0, ee = DynamicExceptions.size(); ei != ee; ++ei) { 11100 // FIXME: Preserve type source info. 11101 QualType ET = GetTypeFromParser(DynamicExceptions[ei]); 11102 11103 SmallVector<UnexpandedParameterPack, 2> Unexpanded; 11104 collectUnexpandedParameterPacks(ET, Unexpanded); 11105 if (!Unexpanded.empty()) { 11106 DiagnoseUnexpandedParameterPacks(DynamicExceptionRanges[ei].getBegin(), 11107 UPPC_ExceptionType, 11108 Unexpanded); 11109 continue; 11110 } 11111 11112 // Check that the type is valid for an exception spec, and 11113 // drop it if not. 11114 if (!CheckSpecifiedExceptionType(ET, DynamicExceptionRanges[ei])) 11115 Exceptions.push_back(ET); 11116 } 11117 EPI.NumExceptions = Exceptions.size(); 11118 EPI.Exceptions = Exceptions.data(); 11119 return; 11120 } 11121 11122 if (EST == EST_ComputedNoexcept) { 11123 // If an error occurred, there's no expression here. 11124 if (NoexceptExpr) { 11125 assert((NoexceptExpr->isTypeDependent() || 11126 NoexceptExpr->getType()->getCanonicalTypeUnqualified() == 11127 Context.BoolTy) && 11128 "Parser should have made sure that the expression is boolean"); 11129 if (NoexceptExpr && DiagnoseUnexpandedParameterPack(NoexceptExpr)) { 11130 EPI.ExceptionSpecType = EST_BasicNoexcept; 11131 return; 11132 } 11133 11134 if (!NoexceptExpr->isValueDependent()) 11135 NoexceptExpr = VerifyIntegerConstantExpression(NoexceptExpr, 0, 11136 diag::err_noexcept_needs_constant_expression, 11137 /*AllowFold*/ false).take(); 11138 EPI.NoexceptExpr = NoexceptExpr; 11139 } 11140 return; 11141 } 11142} 11143 11144/// IdentifyCUDATarget - Determine the CUDA compilation target for this function 11145Sema::CUDAFunctionTarget Sema::IdentifyCUDATarget(const FunctionDecl *D) { 11146 // Implicitly declared functions (e.g. copy constructors) are 11147 // __host__ __device__ 11148 if (D->isImplicit()) 11149 return CFT_HostDevice; 11150 11151 if (D->hasAttr<CUDAGlobalAttr>()) 11152 return CFT_Global; 11153 11154 if (D->hasAttr<CUDADeviceAttr>()) { 11155 if (D->hasAttr<CUDAHostAttr>()) 11156 return CFT_HostDevice; 11157 else 11158 return CFT_Device; 11159 } 11160 11161 return CFT_Host; 11162} 11163 11164bool Sema::CheckCUDATarget(CUDAFunctionTarget CallerTarget, 11165 CUDAFunctionTarget CalleeTarget) { 11166 // CUDA B.1.1 "The __device__ qualifier declares a function that is... 11167 // Callable from the device only." 11168 if (CallerTarget == CFT_Host && CalleeTarget == CFT_Device) 11169 return true; 11170 11171 // CUDA B.1.2 "The __global__ qualifier declares a function that is... 11172 // Callable from the host only." 11173 // CUDA B.1.3 "The __host__ qualifier declares a function that is... 11174 // Callable from the host only." 11175 if ((CallerTarget == CFT_Device || CallerTarget == CFT_Global) && 11176 (CalleeTarget == CFT_Host || CalleeTarget == CFT_Global)) 11177 return true; 11178 11179 if (CallerTarget == CFT_HostDevice && CalleeTarget != CFT_HostDevice) 11180 return true; 11181 11182 return false; 11183} 11184