SemaDeclCXX.cpp revision d6f80daa84164ceeb8900da07f43b6a150edf713
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/EvaluatedExprVisitor.h" 27#include "clang/AST/ExprCXX.h" 28#include "clang/AST/RecordLayout.h" 29#include "clang/AST/RecursiveASTVisitor.h" 30#include "clang/AST/StmtVisitor.h" 31#include "clang/AST/TypeLoc.h" 32#include "clang/AST/TypeOrdering.h" 33#include "clang/Sema/DeclSpec.h" 34#include "clang/Sema/ParsedTemplate.h" 35#include "clang/Basic/PartialDiagnostic.h" 36#include "clang/Lex/Preprocessor.h" 37#include "llvm/ADT/SmallString.h" 38#include "llvm/ADT/STLExtras.h" 39#include <map> 40#include <set> 41 42using namespace clang; 43 44//===----------------------------------------------------------------------===// 45// CheckDefaultArgumentVisitor 46//===----------------------------------------------------------------------===// 47 48namespace { 49 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses 50 /// the default argument of a parameter to determine whether it 51 /// contains any ill-formed subexpressions. For example, this will 52 /// diagnose the use of local variables or parameters within the 53 /// default argument expression. 54 class CheckDefaultArgumentVisitor 55 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { 56 Expr *DefaultArg; 57 Sema *S; 58 59 public: 60 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) 61 : DefaultArg(defarg), S(s) {} 62 63 bool VisitExpr(Expr *Node); 64 bool VisitDeclRefExpr(DeclRefExpr *DRE); 65 bool VisitCXXThisExpr(CXXThisExpr *ThisE); 66 bool VisitLambdaExpr(LambdaExpr *Lambda); 67 }; 68 69 /// VisitExpr - Visit all of the children of this expression. 70 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 71 bool IsInvalid = false; 72 for (Stmt::child_range I = Node->children(); I; ++I) 73 IsInvalid |= Visit(*I); 74 return IsInvalid; 75 } 76 77 /// VisitDeclRefExpr - Visit a reference to a declaration, to 78 /// determine whether this declaration can be used in the default 79 /// argument expression. 80 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { 81 NamedDecl *Decl = DRE->getDecl(); 82 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { 83 // C++ [dcl.fct.default]p9 84 // Default arguments are evaluated each time the function is 85 // called. The order of evaluation of function arguments is 86 // unspecified. Consequently, parameters of a function shall not 87 // be used in default argument expressions, even if they are not 88 // evaluated. Parameters of a function declared before a default 89 // argument expression are in scope and can hide namespace and 90 // class member names. 91 return S->Diag(DRE->getLocStart(), 92 diag::err_param_default_argument_references_param) 93 << Param->getDeclName() << DefaultArg->getSourceRange(); 94 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { 95 // C++ [dcl.fct.default]p7 96 // Local variables shall not be used in default argument 97 // expressions. 98 if (VDecl->isLocalVarDecl()) 99 return S->Diag(DRE->getLocStart(), 100 diag::err_param_default_argument_references_local) 101 << VDecl->getDeclName() << DefaultArg->getSourceRange(); 102 } 103 104 return false; 105 } 106 107 /// VisitCXXThisExpr - Visit a C++ "this" expression. 108 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { 109 // C++ [dcl.fct.default]p8: 110 // The keyword this shall not be used in a default argument of a 111 // member function. 112 return S->Diag(ThisE->getLocStart(), 113 diag::err_param_default_argument_references_this) 114 << ThisE->getSourceRange(); 115 } 116 117 bool CheckDefaultArgumentVisitor::VisitLambdaExpr(LambdaExpr *Lambda) { 118 // C++11 [expr.lambda.prim]p13: 119 // A lambda-expression appearing in a default argument shall not 120 // implicitly or explicitly capture any entity. 121 if (Lambda->capture_begin() == Lambda->capture_end()) 122 return false; 123 124 return S->Diag(Lambda->getLocStart(), 125 diag::err_lambda_capture_default_arg); 126 } 127} 128 129void Sema::ImplicitExceptionSpecification::CalledDecl(SourceLocation CallLoc, 130 CXXMethodDecl *Method) { 131 // If we have an MSAny spec already, don't bother. 132 if (!Method || ComputedEST == EST_MSAny) 133 return; 134 135 const FunctionProtoType *Proto 136 = Method->getType()->getAs<FunctionProtoType>(); 137 Proto = Self->ResolveExceptionSpec(CallLoc, Proto); 138 if (!Proto) 139 return; 140 141 ExceptionSpecificationType EST = Proto->getExceptionSpecType(); 142 143 // If this function can throw any exceptions, make a note of that. 144 if (EST == EST_MSAny || EST == EST_None) { 145 ClearExceptions(); 146 ComputedEST = EST; 147 return; 148 } 149 150 // FIXME: If the call to this decl is using any of its default arguments, we 151 // need to search them for potentially-throwing calls. 152 153 // If this function has a basic noexcept, it doesn't affect the outcome. 154 if (EST == EST_BasicNoexcept) 155 return; 156 157 // If we have a throw-all spec at this point, ignore the function. 158 if (ComputedEST == EST_None) 159 return; 160 161 // If we're still at noexcept(true) and there's a nothrow() callee, 162 // change to that specification. 163 if (EST == EST_DynamicNone) { 164 if (ComputedEST == EST_BasicNoexcept) 165 ComputedEST = EST_DynamicNone; 166 return; 167 } 168 169 // Check out noexcept specs. 170 if (EST == EST_ComputedNoexcept) { 171 FunctionProtoType::NoexceptResult NR = 172 Proto->getNoexceptSpec(Self->Context); 173 assert(NR != FunctionProtoType::NR_NoNoexcept && 174 "Must have noexcept result for EST_ComputedNoexcept."); 175 assert(NR != FunctionProtoType::NR_Dependent && 176 "Should not generate implicit declarations for dependent cases, " 177 "and don't know how to handle them anyway."); 178 179 // noexcept(false) -> no spec on the new function 180 if (NR == FunctionProtoType::NR_Throw) { 181 ClearExceptions(); 182 ComputedEST = EST_None; 183 } 184 // noexcept(true) won't change anything either. 185 return; 186 } 187 188 assert(EST == EST_Dynamic && "EST case not considered earlier."); 189 assert(ComputedEST != EST_None && 190 "Shouldn't collect exceptions when throw-all is guaranteed."); 191 ComputedEST = EST_Dynamic; 192 // Record the exceptions in this function's exception specification. 193 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(), 194 EEnd = Proto->exception_end(); 195 E != EEnd; ++E) 196 if (ExceptionsSeen.insert(Self->Context.getCanonicalType(*E))) 197 Exceptions.push_back(*E); 198} 199 200void Sema::ImplicitExceptionSpecification::CalledExpr(Expr *E) { 201 if (!E || ComputedEST == EST_MSAny) 202 return; 203 204 // FIXME: 205 // 206 // C++0x [except.spec]p14: 207 // [An] implicit exception-specification specifies the type-id T if and 208 // only if T is allowed by the exception-specification of a function directly 209 // invoked by f's implicit definition; f shall allow all exceptions if any 210 // function it directly invokes allows all exceptions, and f shall allow no 211 // exceptions if every function it directly invokes allows no exceptions. 212 // 213 // Note in particular that if an implicit exception-specification is generated 214 // for a function containing a throw-expression, that specification can still 215 // be noexcept(true). 216 // 217 // Note also that 'directly invoked' is not defined in the standard, and there 218 // is no indication that we should only consider potentially-evaluated calls. 219 // 220 // Ultimately we should implement the intent of the standard: the exception 221 // specification should be the set of exceptions which can be thrown by the 222 // implicit definition. For now, we assume that any non-nothrow expression can 223 // throw any exception. 224 225 if (Self->canThrow(E)) 226 ComputedEST = EST_None; 227} 228 229bool 230Sema::SetParamDefaultArgument(ParmVarDecl *Param, Expr *Arg, 231 SourceLocation EqualLoc) { 232 if (RequireCompleteType(Param->getLocation(), Param->getType(), 233 diag::err_typecheck_decl_incomplete_type)) { 234 Param->setInvalidDecl(); 235 return true; 236 } 237 238 // C++ [dcl.fct.default]p5 239 // A default argument expression is implicitly converted (clause 240 // 4) to the parameter type. The default argument expression has 241 // the same semantic constraints as the initializer expression in 242 // a declaration of a variable of the parameter type, using the 243 // copy-initialization semantics (8.5). 244 InitializedEntity Entity = InitializedEntity::InitializeParameter(Context, 245 Param); 246 InitializationKind Kind = InitializationKind::CreateCopy(Param->getLocation(), 247 EqualLoc); 248 InitializationSequence InitSeq(*this, Entity, Kind, &Arg, 1); 249 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, Arg); 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/// \brief Get diagnostic %select index for tag kind for 679/// record diagnostic message. 680/// WARNING: Indexes apply to particular diagnostics only! 681/// 682/// \returns diagnostic %select index. 683static unsigned getRecordDiagFromTagKind(TagTypeKind Tag) { 684 switch (Tag) { 685 case TTK_Struct: return 0; 686 case TTK_Interface: return 1; 687 case TTK_Class: return 2; 688 default: llvm_unreachable("Invalid tag kind for record diagnostic!"); 689 } 690} 691 692// CheckConstexprFunctionDecl - Check whether a function declaration satisfies 693// the requirements of a constexpr function definition or a constexpr 694// constructor definition. If so, return true. If not, produce appropriate 695// diagnostics and return false. 696// 697// This implements C++11 [dcl.constexpr]p3,4, as amended by DR1360. 698bool Sema::CheckConstexprFunctionDecl(const FunctionDecl *NewFD) { 699 const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewFD); 700 if (MD && MD->isInstance()) { 701 // C++11 [dcl.constexpr]p4: 702 // The definition of a constexpr constructor shall satisfy the following 703 // constraints: 704 // - the class shall not have any virtual base classes; 705 const CXXRecordDecl *RD = MD->getParent(); 706 if (RD->getNumVBases()) { 707 Diag(NewFD->getLocation(), diag::err_constexpr_virtual_base) 708 << isa<CXXConstructorDecl>(NewFD) 709 << getRecordDiagFromTagKind(RD->getTagKind()) << RD->getNumVBases(); 710 for (CXXRecordDecl::base_class_const_iterator I = RD->vbases_begin(), 711 E = RD->vbases_end(); I != E; ++I) 712 Diag(I->getLocStart(), 713 diag::note_constexpr_virtual_base_here) << I->getSourceRange(); 714 return false; 715 } 716 } 717 718 if (!isa<CXXConstructorDecl>(NewFD)) { 719 // C++11 [dcl.constexpr]p3: 720 // The definition of a constexpr function shall satisfy the following 721 // constraints: 722 // - it shall not be virtual; 723 const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD); 724 if (Method && Method->isVirtual()) { 725 Diag(NewFD->getLocation(), diag::err_constexpr_virtual); 726 727 // If it's not obvious why this function is virtual, find an overridden 728 // function which uses the 'virtual' keyword. 729 const CXXMethodDecl *WrittenVirtual = Method; 730 while (!WrittenVirtual->isVirtualAsWritten()) 731 WrittenVirtual = *WrittenVirtual->begin_overridden_methods(); 732 if (WrittenVirtual != Method) 733 Diag(WrittenVirtual->getLocation(), 734 diag::note_overridden_virtual_function); 735 return false; 736 } 737 738 // - its return type shall be a literal type; 739 QualType RT = NewFD->getResultType(); 740 if (!RT->isDependentType() && 741 RequireLiteralType(NewFD->getLocation(), RT, 742 diag::err_constexpr_non_literal_return)) 743 return false; 744 } 745 746 // - each of its parameter types shall be a literal type; 747 if (!CheckConstexprParameterTypes(*this, NewFD)) 748 return false; 749 750 return true; 751} 752 753/// Check the given declaration statement is legal within a constexpr function 754/// body. C++0x [dcl.constexpr]p3,p4. 755/// 756/// \return true if the body is OK, false if we have diagnosed a problem. 757static bool CheckConstexprDeclStmt(Sema &SemaRef, const FunctionDecl *Dcl, 758 DeclStmt *DS) { 759 // C++0x [dcl.constexpr]p3 and p4: 760 // The definition of a constexpr function(p3) or constructor(p4) [...] shall 761 // contain only 762 for (DeclStmt::decl_iterator DclIt = DS->decl_begin(), 763 DclEnd = DS->decl_end(); DclIt != DclEnd; ++DclIt) { 764 switch ((*DclIt)->getKind()) { 765 case Decl::StaticAssert: 766 case Decl::Using: 767 case Decl::UsingShadow: 768 case Decl::UsingDirective: 769 case Decl::UnresolvedUsingTypename: 770 // - static_assert-declarations 771 // - using-declarations, 772 // - using-directives, 773 continue; 774 775 case Decl::Typedef: 776 case Decl::TypeAlias: { 777 // - typedef declarations and alias-declarations that do not define 778 // classes or enumerations, 779 TypedefNameDecl *TN = cast<TypedefNameDecl>(*DclIt); 780 if (TN->getUnderlyingType()->isVariablyModifiedType()) { 781 // Don't allow variably-modified types in constexpr functions. 782 TypeLoc TL = TN->getTypeSourceInfo()->getTypeLoc(); 783 SemaRef.Diag(TL.getBeginLoc(), diag::err_constexpr_vla) 784 << TL.getSourceRange() << TL.getType() 785 << isa<CXXConstructorDecl>(Dcl); 786 return false; 787 } 788 continue; 789 } 790 791 case Decl::Enum: 792 case Decl::CXXRecord: 793 // As an extension, we allow the declaration (but not the definition) of 794 // classes and enumerations in all declarations, not just in typedef and 795 // alias declarations. 796 if (cast<TagDecl>(*DclIt)->isThisDeclarationADefinition()) { 797 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_type_definition) 798 << isa<CXXConstructorDecl>(Dcl); 799 return false; 800 } 801 continue; 802 803 case Decl::Var: 804 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_var_declaration) 805 << isa<CXXConstructorDecl>(Dcl); 806 return false; 807 808 default: 809 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_body_invalid_stmt) 810 << isa<CXXConstructorDecl>(Dcl); 811 return false; 812 } 813 } 814 815 return true; 816} 817 818/// Check that the given field is initialized within a constexpr constructor. 819/// 820/// \param Dcl The constexpr constructor being checked. 821/// \param Field The field being checked. This may be a member of an anonymous 822/// struct or union nested within the class being checked. 823/// \param Inits All declarations, including anonymous struct/union members and 824/// indirect members, for which any initialization was provided. 825/// \param Diagnosed Set to true if an error is produced. 826static void CheckConstexprCtorInitializer(Sema &SemaRef, 827 const FunctionDecl *Dcl, 828 FieldDecl *Field, 829 llvm::SmallSet<Decl*, 16> &Inits, 830 bool &Diagnosed) { 831 if (Field->isUnnamedBitfield()) 832 return; 833 834 if (Field->isAnonymousStructOrUnion() && 835 Field->getType()->getAsCXXRecordDecl()->isEmpty()) 836 return; 837 838 if (!Inits.count(Field)) { 839 if (!Diagnosed) { 840 SemaRef.Diag(Dcl->getLocation(), diag::err_constexpr_ctor_missing_init); 841 Diagnosed = true; 842 } 843 SemaRef.Diag(Field->getLocation(), diag::note_constexpr_ctor_missing_init); 844 } else if (Field->isAnonymousStructOrUnion()) { 845 const RecordDecl *RD = Field->getType()->castAs<RecordType>()->getDecl(); 846 for (RecordDecl::field_iterator I = RD->field_begin(), E = RD->field_end(); 847 I != E; ++I) 848 // If an anonymous union contains an anonymous struct of which any member 849 // is initialized, all members must be initialized. 850 if (!RD->isUnion() || Inits.count(*I)) 851 CheckConstexprCtorInitializer(SemaRef, Dcl, *I, Inits, Diagnosed); 852 } 853} 854 855/// Check the body for the given constexpr function declaration only contains 856/// the permitted types of statement. C++11 [dcl.constexpr]p3,p4. 857/// 858/// \return true if the body is OK, false if we have diagnosed a problem. 859bool Sema::CheckConstexprFunctionBody(const FunctionDecl *Dcl, Stmt *Body) { 860 if (isa<CXXTryStmt>(Body)) { 861 // C++11 [dcl.constexpr]p3: 862 // The definition of a constexpr function shall satisfy the following 863 // constraints: [...] 864 // - its function-body shall be = delete, = default, or a 865 // compound-statement 866 // 867 // C++11 [dcl.constexpr]p4: 868 // In the definition of a constexpr constructor, [...] 869 // - its function-body shall not be a function-try-block; 870 Diag(Body->getLocStart(), diag::err_constexpr_function_try_block) 871 << isa<CXXConstructorDecl>(Dcl); 872 return false; 873 } 874 875 // - its function-body shall be [...] a compound-statement that contains only 876 CompoundStmt *CompBody = cast<CompoundStmt>(Body); 877 878 llvm::SmallVector<SourceLocation, 4> ReturnStmts; 879 for (CompoundStmt::body_iterator BodyIt = CompBody->body_begin(), 880 BodyEnd = CompBody->body_end(); BodyIt != BodyEnd; ++BodyIt) { 881 switch ((*BodyIt)->getStmtClass()) { 882 case Stmt::NullStmtClass: 883 // - null statements, 884 continue; 885 886 case Stmt::DeclStmtClass: 887 // - static_assert-declarations 888 // - using-declarations, 889 // - using-directives, 890 // - typedef declarations and alias-declarations that do not define 891 // classes or enumerations, 892 if (!CheckConstexprDeclStmt(*this, Dcl, cast<DeclStmt>(*BodyIt))) 893 return false; 894 continue; 895 896 case Stmt::ReturnStmtClass: 897 // - and exactly one return statement; 898 if (isa<CXXConstructorDecl>(Dcl)) 899 break; 900 901 ReturnStmts.push_back((*BodyIt)->getLocStart()); 902 continue; 903 904 default: 905 break; 906 } 907 908 Diag((*BodyIt)->getLocStart(), diag::err_constexpr_body_invalid_stmt) 909 << isa<CXXConstructorDecl>(Dcl); 910 return false; 911 } 912 913 if (const CXXConstructorDecl *Constructor 914 = dyn_cast<CXXConstructorDecl>(Dcl)) { 915 const CXXRecordDecl *RD = Constructor->getParent(); 916 // DR1359: 917 // - every non-variant non-static data member and base class sub-object 918 // shall be initialized; 919 // - if the class is a non-empty union, or for each non-empty anonymous 920 // union member of a non-union class, exactly one non-static data member 921 // shall be initialized; 922 if (RD->isUnion()) { 923 if (Constructor->getNumCtorInitializers() == 0 && !RD->isEmpty()) { 924 Diag(Dcl->getLocation(), diag::err_constexpr_union_ctor_no_init); 925 return false; 926 } 927 } else if (!Constructor->isDependentContext() && 928 !Constructor->isDelegatingConstructor()) { 929 assert(RD->getNumVBases() == 0 && "constexpr ctor with virtual bases"); 930 931 // Skip detailed checking if we have enough initializers, and we would 932 // allow at most one initializer per member. 933 bool AnyAnonStructUnionMembers = false; 934 unsigned Fields = 0; 935 for (CXXRecordDecl::field_iterator I = RD->field_begin(), 936 E = RD->field_end(); I != E; ++I, ++Fields) { 937 if (I->isAnonymousStructOrUnion()) { 938 AnyAnonStructUnionMembers = true; 939 break; 940 } 941 } 942 if (AnyAnonStructUnionMembers || 943 Constructor->getNumCtorInitializers() != RD->getNumBases() + Fields) { 944 // Check initialization of non-static data members. Base classes are 945 // always initialized so do not need to be checked. Dependent bases 946 // might not have initializers in the member initializer list. 947 llvm::SmallSet<Decl*, 16> Inits; 948 for (CXXConstructorDecl::init_const_iterator 949 I = Constructor->init_begin(), E = Constructor->init_end(); 950 I != E; ++I) { 951 if (FieldDecl *FD = (*I)->getMember()) 952 Inits.insert(FD); 953 else if (IndirectFieldDecl *ID = (*I)->getIndirectMember()) 954 Inits.insert(ID->chain_begin(), ID->chain_end()); 955 } 956 957 bool Diagnosed = false; 958 for (CXXRecordDecl::field_iterator I = RD->field_begin(), 959 E = RD->field_end(); I != E; ++I) 960 CheckConstexprCtorInitializer(*this, Dcl, *I, Inits, Diagnosed); 961 if (Diagnosed) 962 return false; 963 } 964 } 965 } else { 966 if (ReturnStmts.empty()) { 967 Diag(Dcl->getLocation(), diag::err_constexpr_body_no_return); 968 return false; 969 } 970 if (ReturnStmts.size() > 1) { 971 Diag(ReturnStmts.back(), diag::err_constexpr_body_multiple_return); 972 for (unsigned I = 0; I < ReturnStmts.size() - 1; ++I) 973 Diag(ReturnStmts[I], diag::note_constexpr_body_previous_return); 974 return false; 975 } 976 } 977 978 // C++11 [dcl.constexpr]p5: 979 // if no function argument values exist such that the function invocation 980 // substitution would produce a constant expression, the program is 981 // ill-formed; no diagnostic required. 982 // C++11 [dcl.constexpr]p3: 983 // - every constructor call and implicit conversion used in initializing the 984 // return value shall be one of those allowed in a constant expression. 985 // C++11 [dcl.constexpr]p4: 986 // - every constructor involved in initializing non-static data members and 987 // base class sub-objects shall be a constexpr constructor. 988 llvm::SmallVector<PartialDiagnosticAt, 8> Diags; 989 if (!Expr::isPotentialConstantExpr(Dcl, Diags)) { 990 Diag(Dcl->getLocation(), diag::err_constexpr_function_never_constant_expr) 991 << isa<CXXConstructorDecl>(Dcl); 992 for (size_t I = 0, N = Diags.size(); I != N; ++I) 993 Diag(Diags[I].first, Diags[I].second); 994 return false; 995 } 996 997 return true; 998} 999 1000/// isCurrentClassName - Determine whether the identifier II is the 1001/// name of the class type currently being defined. In the case of 1002/// nested classes, this will only return true if II is the name of 1003/// the innermost class. 1004bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 1005 const CXXScopeSpec *SS) { 1006 assert(getLangOpts().CPlusPlus && "No class names in C!"); 1007 1008 CXXRecordDecl *CurDecl; 1009 if (SS && SS->isSet() && !SS->isInvalid()) { 1010 DeclContext *DC = computeDeclContext(*SS, true); 1011 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 1012 } else 1013 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 1014 1015 if (CurDecl && CurDecl->getIdentifier()) 1016 return &II == CurDecl->getIdentifier(); 1017 else 1018 return false; 1019} 1020 1021/// \brief Check the validity of a C++ base class specifier. 1022/// 1023/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 1024/// and returns NULL otherwise. 1025CXXBaseSpecifier * 1026Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 1027 SourceRange SpecifierRange, 1028 bool Virtual, AccessSpecifier Access, 1029 TypeSourceInfo *TInfo, 1030 SourceLocation EllipsisLoc) { 1031 QualType BaseType = TInfo->getType(); 1032 1033 // C++ [class.union]p1: 1034 // A union shall not have base classes. 1035 if (Class->isUnion()) { 1036 Diag(Class->getLocation(), diag::err_base_clause_on_union) 1037 << SpecifierRange; 1038 return 0; 1039 } 1040 1041 if (EllipsisLoc.isValid() && 1042 !TInfo->getType()->containsUnexpandedParameterPack()) { 1043 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 1044 << TInfo->getTypeLoc().getSourceRange(); 1045 EllipsisLoc = SourceLocation(); 1046 } 1047 1048 if (BaseType->isDependentType()) 1049 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 1050 Class->getTagKind() == TTK_Class, 1051 Access, TInfo, EllipsisLoc); 1052 1053 SourceLocation BaseLoc = TInfo->getTypeLoc().getBeginLoc(); 1054 1055 // Base specifiers must be record types. 1056 if (!BaseType->isRecordType()) { 1057 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 1058 return 0; 1059 } 1060 1061 // C++ [class.union]p1: 1062 // A union shall not be used as a base class. 1063 if (BaseType->isUnionType()) { 1064 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 1065 return 0; 1066 } 1067 1068 // C++ [class.derived]p2: 1069 // The class-name in a base-specifier shall not be an incompletely 1070 // defined class. 1071 if (RequireCompleteType(BaseLoc, BaseType, 1072 diag::err_incomplete_base_class, SpecifierRange)) { 1073 Class->setInvalidDecl(); 1074 return 0; 1075 } 1076 1077 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 1078 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 1079 assert(BaseDecl && "Record type has no declaration"); 1080 BaseDecl = BaseDecl->getDefinition(); 1081 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 1082 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 1083 assert(CXXBaseDecl && "Base type is not a C++ type"); 1084 1085 // C++ [class]p3: 1086 // If a class is marked final and it appears as a base-type-specifier in 1087 // base-clause, the program is ill-formed. 1088 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 1089 Diag(BaseLoc, diag::err_class_marked_final_used_as_base) 1090 << CXXBaseDecl->getDeclName(); 1091 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 1092 << CXXBaseDecl->getDeclName(); 1093 return 0; 1094 } 1095 1096 if (BaseDecl->isInvalidDecl()) 1097 Class->setInvalidDecl(); 1098 1099 // Create the base specifier. 1100 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 1101 Class->getTagKind() == TTK_Class, 1102 Access, TInfo, EllipsisLoc); 1103} 1104 1105/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 1106/// one entry in the base class list of a class specifier, for 1107/// example: 1108/// class foo : public bar, virtual private baz { 1109/// 'public bar' and 'virtual private baz' are each base-specifiers. 1110BaseResult 1111Sema::ActOnBaseSpecifier(Decl *classdecl, SourceRange SpecifierRange, 1112 bool Virtual, AccessSpecifier Access, 1113 ParsedType basetype, SourceLocation BaseLoc, 1114 SourceLocation EllipsisLoc) { 1115 if (!classdecl) 1116 return true; 1117 1118 AdjustDeclIfTemplate(classdecl); 1119 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl); 1120 if (!Class) 1121 return true; 1122 1123 TypeSourceInfo *TInfo = 0; 1124 GetTypeFromParser(basetype, &TInfo); 1125 1126 if (EllipsisLoc.isInvalid() && 1127 DiagnoseUnexpandedParameterPack(SpecifierRange.getBegin(), TInfo, 1128 UPPC_BaseType)) 1129 return true; 1130 1131 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 1132 Virtual, Access, TInfo, 1133 EllipsisLoc)) 1134 return BaseSpec; 1135 else 1136 Class->setInvalidDecl(); 1137 1138 return true; 1139} 1140 1141/// \brief Performs the actual work of attaching the given base class 1142/// specifiers to a C++ class. 1143bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 1144 unsigned NumBases) { 1145 if (NumBases == 0) 1146 return false; 1147 1148 // Used to keep track of which base types we have already seen, so 1149 // that we can properly diagnose redundant direct base types. Note 1150 // that the key is always the unqualified canonical type of the base 1151 // class. 1152 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 1153 1154 // Copy non-redundant base specifiers into permanent storage. 1155 unsigned NumGoodBases = 0; 1156 bool Invalid = false; 1157 for (unsigned idx = 0; idx < NumBases; ++idx) { 1158 QualType NewBaseType 1159 = Context.getCanonicalType(Bases[idx]->getType()); 1160 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 1161 1162 CXXBaseSpecifier *&KnownBase = KnownBaseTypes[NewBaseType]; 1163 if (KnownBase) { 1164 // C++ [class.mi]p3: 1165 // A class shall not be specified as a direct base class of a 1166 // derived class more than once. 1167 Diag(Bases[idx]->getLocStart(), 1168 diag::err_duplicate_base_class) 1169 << KnownBase->getType() 1170 << Bases[idx]->getSourceRange(); 1171 1172 // Delete the duplicate base class specifier; we're going to 1173 // overwrite its pointer later. 1174 Context.Deallocate(Bases[idx]); 1175 1176 Invalid = true; 1177 } else { 1178 // Okay, add this new base class. 1179 KnownBase = Bases[idx]; 1180 Bases[NumGoodBases++] = Bases[idx]; 1181 if (const RecordType *Record = NewBaseType->getAs<RecordType>()) 1182 if (const CXXRecordDecl *RD = cast<CXXRecordDecl>(Record->getDecl())) 1183 if (RD->hasAttr<WeakAttr>()) 1184 Class->addAttr(::new (Context) WeakAttr(SourceRange(), Context)); 1185 } 1186 } 1187 1188 // Attach the remaining base class specifiers to the derived class. 1189 Class->setBases(Bases, NumGoodBases); 1190 1191 // Delete the remaining (good) base class specifiers, since their 1192 // data has been copied into the CXXRecordDecl. 1193 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 1194 Context.Deallocate(Bases[idx]); 1195 1196 return Invalid; 1197} 1198 1199/// ActOnBaseSpecifiers - Attach the given base specifiers to the 1200/// class, after checking whether there are any duplicate base 1201/// classes. 1202void Sema::ActOnBaseSpecifiers(Decl *ClassDecl, CXXBaseSpecifier **Bases, 1203 unsigned NumBases) { 1204 if (!ClassDecl || !Bases || !NumBases) 1205 return; 1206 1207 AdjustDeclIfTemplate(ClassDecl); 1208 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl), 1209 (CXXBaseSpecifier**)(Bases), NumBases); 1210} 1211 1212static CXXRecordDecl *GetClassForType(QualType T) { 1213 if (const RecordType *RT = T->getAs<RecordType>()) 1214 return cast<CXXRecordDecl>(RT->getDecl()); 1215 else if (const InjectedClassNameType *ICT = T->getAs<InjectedClassNameType>()) 1216 return ICT->getDecl(); 1217 else 1218 return 0; 1219} 1220 1221/// \brief Determine whether the type \p Derived is a C++ class that is 1222/// derived from the type \p Base. 1223bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 1224 if (!getLangOpts().CPlusPlus) 1225 return false; 1226 1227 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 1228 if (!DerivedRD) 1229 return false; 1230 1231 CXXRecordDecl *BaseRD = GetClassForType(Base); 1232 if (!BaseRD) 1233 return false; 1234 1235 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 1236 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 1237} 1238 1239/// \brief Determine whether the type \p Derived is a C++ class that is 1240/// derived from the type \p Base. 1241bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 1242 if (!getLangOpts().CPlusPlus) 1243 return false; 1244 1245 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 1246 if (!DerivedRD) 1247 return false; 1248 1249 CXXRecordDecl *BaseRD = GetClassForType(Base); 1250 if (!BaseRD) 1251 return false; 1252 1253 return DerivedRD->isDerivedFrom(BaseRD, Paths); 1254} 1255 1256void Sema::BuildBasePathArray(const CXXBasePaths &Paths, 1257 CXXCastPath &BasePathArray) { 1258 assert(BasePathArray.empty() && "Base path array must be empty!"); 1259 assert(Paths.isRecordingPaths() && "Must record paths!"); 1260 1261 const CXXBasePath &Path = Paths.front(); 1262 1263 // We first go backward and check if we have a virtual base. 1264 // FIXME: It would be better if CXXBasePath had the base specifier for 1265 // the nearest virtual base. 1266 unsigned Start = 0; 1267 for (unsigned I = Path.size(); I != 0; --I) { 1268 if (Path[I - 1].Base->isVirtual()) { 1269 Start = I - 1; 1270 break; 1271 } 1272 } 1273 1274 // Now add all bases. 1275 for (unsigned I = Start, E = Path.size(); I != E; ++I) 1276 BasePathArray.push_back(const_cast<CXXBaseSpecifier*>(Path[I].Base)); 1277} 1278 1279/// \brief Determine whether the given base path includes a virtual 1280/// base class. 1281bool Sema::BasePathInvolvesVirtualBase(const CXXCastPath &BasePath) { 1282 for (CXXCastPath::const_iterator B = BasePath.begin(), 1283 BEnd = BasePath.end(); 1284 B != BEnd; ++B) 1285 if ((*B)->isVirtual()) 1286 return true; 1287 1288 return false; 1289} 1290 1291/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 1292/// conversion (where Derived and Base are class types) is 1293/// well-formed, meaning that the conversion is unambiguous (and 1294/// that all of the base classes are accessible). Returns true 1295/// and emits a diagnostic if the code is ill-formed, returns false 1296/// otherwise. Loc is the location where this routine should point to 1297/// if there is an error, and Range is the source range to highlight 1298/// if there is an error. 1299bool 1300Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 1301 unsigned InaccessibleBaseID, 1302 unsigned AmbigiousBaseConvID, 1303 SourceLocation Loc, SourceRange Range, 1304 DeclarationName Name, 1305 CXXCastPath *BasePath) { 1306 // First, determine whether the path from Derived to Base is 1307 // ambiguous. This is slightly more expensive than checking whether 1308 // the Derived to Base conversion exists, because here we need to 1309 // explore multiple paths to determine if there is an ambiguity. 1310 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1311 /*DetectVirtual=*/false); 1312 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 1313 assert(DerivationOkay && 1314 "Can only be used with a derived-to-base conversion"); 1315 (void)DerivationOkay; 1316 1317 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 1318 if (InaccessibleBaseID) { 1319 // Check that the base class can be accessed. 1320 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(), 1321 InaccessibleBaseID)) { 1322 case AR_inaccessible: 1323 return true; 1324 case AR_accessible: 1325 case AR_dependent: 1326 case AR_delayed: 1327 break; 1328 } 1329 } 1330 1331 // Build a base path if necessary. 1332 if (BasePath) 1333 BuildBasePathArray(Paths, *BasePath); 1334 return false; 1335 } 1336 1337 // We know that the derived-to-base conversion is ambiguous, and 1338 // we're going to produce a diagnostic. Perform the derived-to-base 1339 // search just one more time to compute all of the possible paths so 1340 // that we can print them out. This is more expensive than any of 1341 // the previous derived-to-base checks we've done, but at this point 1342 // performance isn't as much of an issue. 1343 Paths.clear(); 1344 Paths.setRecordingPaths(true); 1345 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 1346 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 1347 (void)StillOkay; 1348 1349 // Build up a textual representation of the ambiguous paths, e.g., 1350 // D -> B -> A, that will be used to illustrate the ambiguous 1351 // conversions in the diagnostic. We only print one of the paths 1352 // to each base class subobject. 1353 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 1354 1355 Diag(Loc, AmbigiousBaseConvID) 1356 << Derived << Base << PathDisplayStr << Range << Name; 1357 return true; 1358} 1359 1360bool 1361Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 1362 SourceLocation Loc, SourceRange Range, 1363 CXXCastPath *BasePath, 1364 bool IgnoreAccess) { 1365 return CheckDerivedToBaseConversion(Derived, Base, 1366 IgnoreAccess ? 0 1367 : diag::err_upcast_to_inaccessible_base, 1368 diag::err_ambiguous_derived_to_base_conv, 1369 Loc, Range, DeclarationName(), 1370 BasePath); 1371} 1372 1373 1374/// @brief Builds a string representing ambiguous paths from a 1375/// specific derived class to different subobjects of the same base 1376/// class. 1377/// 1378/// This function builds a string that can be used in error messages 1379/// to show the different paths that one can take through the 1380/// inheritance hierarchy to go from the derived class to different 1381/// subobjects of a base class. The result looks something like this: 1382/// @code 1383/// struct D -> struct B -> struct A 1384/// struct D -> struct C -> struct A 1385/// @endcode 1386std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 1387 std::string PathDisplayStr; 1388 std::set<unsigned> DisplayedPaths; 1389 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1390 Path != Paths.end(); ++Path) { 1391 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 1392 // We haven't displayed a path to this particular base 1393 // class subobject yet. 1394 PathDisplayStr += "\n "; 1395 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 1396 for (CXXBasePath::const_iterator Element = Path->begin(); 1397 Element != Path->end(); ++Element) 1398 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 1399 } 1400 } 1401 1402 return PathDisplayStr; 1403} 1404 1405//===----------------------------------------------------------------------===// 1406// C++ class member Handling 1407//===----------------------------------------------------------------------===// 1408 1409/// ActOnAccessSpecifier - Parsed an access specifier followed by a colon. 1410bool Sema::ActOnAccessSpecifier(AccessSpecifier Access, 1411 SourceLocation ASLoc, 1412 SourceLocation ColonLoc, 1413 AttributeList *Attrs) { 1414 assert(Access != AS_none && "Invalid kind for syntactic access specifier!"); 1415 AccessSpecDecl *ASDecl = AccessSpecDecl::Create(Context, Access, CurContext, 1416 ASLoc, ColonLoc); 1417 CurContext->addHiddenDecl(ASDecl); 1418 return ProcessAccessDeclAttributeList(ASDecl, Attrs); 1419} 1420 1421/// CheckOverrideControl - Check C++11 override control semantics. 1422void Sema::CheckOverrideControl(Decl *D) { 1423 if (D->isInvalidDecl()) 1424 return; 1425 1426 const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D); 1427 1428 // Do we know which functions this declaration might be overriding? 1429 bool OverridesAreKnown = !MD || 1430 (!MD->getParent()->hasAnyDependentBases() && 1431 !MD->getType()->isDependentType()); 1432 1433 if (!MD || !MD->isVirtual()) { 1434 if (OverridesAreKnown) { 1435 if (OverrideAttr *OA = D->getAttr<OverrideAttr>()) { 1436 Diag(OA->getLocation(), 1437 diag::override_keyword_only_allowed_on_virtual_member_functions) 1438 << "override" << FixItHint::CreateRemoval(OA->getLocation()); 1439 D->dropAttr<OverrideAttr>(); 1440 } 1441 if (FinalAttr *FA = D->getAttr<FinalAttr>()) { 1442 Diag(FA->getLocation(), 1443 diag::override_keyword_only_allowed_on_virtual_member_functions) 1444 << "final" << FixItHint::CreateRemoval(FA->getLocation()); 1445 D->dropAttr<FinalAttr>(); 1446 } 1447 } 1448 return; 1449 } 1450 1451 if (!OverridesAreKnown) 1452 return; 1453 1454 // C++11 [class.virtual]p5: 1455 // If a virtual function is marked with the virt-specifier override and 1456 // does not override a member function of a base class, the program is 1457 // ill-formed. 1458 bool HasOverriddenMethods = 1459 MD->begin_overridden_methods() != MD->end_overridden_methods(); 1460 if (MD->hasAttr<OverrideAttr>() && !HasOverriddenMethods) 1461 Diag(MD->getLocation(), diag::err_function_marked_override_not_overriding) 1462 << MD->getDeclName(); 1463} 1464 1465/// CheckIfOverriddenFunctionIsMarkedFinal - Checks whether a virtual member 1466/// function overrides a virtual member function marked 'final', according to 1467/// C++11 [class.virtual]p4. 1468bool Sema::CheckIfOverriddenFunctionIsMarkedFinal(const CXXMethodDecl *New, 1469 const CXXMethodDecl *Old) { 1470 if (!Old->hasAttr<FinalAttr>()) 1471 return false; 1472 1473 Diag(New->getLocation(), diag::err_final_function_overridden) 1474 << New->getDeclName(); 1475 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 1476 return true; 1477} 1478 1479static bool InitializationHasSideEffects(const FieldDecl &FD) { 1480 const Type *T = FD.getType()->getBaseElementTypeUnsafe(); 1481 // FIXME: Destruction of ObjC lifetime types has side-effects. 1482 if (const CXXRecordDecl *RD = T->getAsCXXRecordDecl()) 1483 return !RD->isCompleteDefinition() || 1484 !RD->hasTrivialDefaultConstructor() || 1485 !RD->hasTrivialDestructor(); 1486 return false; 1487} 1488 1489/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 1490/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 1491/// bitfield width if there is one, 'InitExpr' specifies the initializer if 1492/// one has been parsed, and 'InitStyle' is set if an in-class initializer is 1493/// present (but parsing it has been deferred). 1494Decl * 1495Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 1496 MultiTemplateParamsArg TemplateParameterLists, 1497 Expr *BW, const VirtSpecifiers &VS, 1498 InClassInitStyle InitStyle) { 1499 const DeclSpec &DS = D.getDeclSpec(); 1500 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 1501 DeclarationName Name = NameInfo.getName(); 1502 SourceLocation Loc = NameInfo.getLoc(); 1503 1504 // For anonymous bitfields, the location should point to the type. 1505 if (Loc.isInvalid()) 1506 Loc = D.getLocStart(); 1507 1508 Expr *BitWidth = static_cast<Expr*>(BW); 1509 1510 assert(isa<CXXRecordDecl>(CurContext)); 1511 assert(!DS.isFriendSpecified()); 1512 1513 bool isFunc = D.isDeclarationOfFunction(); 1514 1515 // C++ 9.2p6: A member shall not be declared to have automatic storage 1516 // duration (auto, register) or with the extern storage-class-specifier. 1517 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 1518 // data members and cannot be applied to names declared const or static, 1519 // and cannot be applied to reference members. 1520 switch (DS.getStorageClassSpec()) { 1521 case DeclSpec::SCS_unspecified: 1522 case DeclSpec::SCS_typedef: 1523 case DeclSpec::SCS_static: 1524 // FALL THROUGH. 1525 break; 1526 case DeclSpec::SCS_mutable: 1527 if (isFunc) { 1528 if (DS.getStorageClassSpecLoc().isValid()) 1529 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 1530 else 1531 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 1532 1533 // FIXME: It would be nicer if the keyword was ignored only for this 1534 // declarator. Otherwise we could get follow-up errors. 1535 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1536 } 1537 break; 1538 default: 1539 if (DS.getStorageClassSpecLoc().isValid()) 1540 Diag(DS.getStorageClassSpecLoc(), 1541 diag::err_storageclass_invalid_for_member); 1542 else 1543 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 1544 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1545 } 1546 1547 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 1548 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 1549 !isFunc); 1550 1551 Decl *Member; 1552 if (isInstField) { 1553 CXXScopeSpec &SS = D.getCXXScopeSpec(); 1554 1555 // Data members must have identifiers for names. 1556 if (!Name.isIdentifier()) { 1557 Diag(Loc, diag::err_bad_variable_name) 1558 << Name; 1559 return 0; 1560 } 1561 1562 IdentifierInfo *II = Name.getAsIdentifierInfo(); 1563 1564 // Member field could not be with "template" keyword. 1565 // So TemplateParameterLists should be empty in this case. 1566 if (TemplateParameterLists.size()) { 1567 TemplateParameterList* TemplateParams = TemplateParameterLists[0]; 1568 if (TemplateParams->size()) { 1569 // There is no such thing as a member field template. 1570 Diag(D.getIdentifierLoc(), diag::err_template_member) 1571 << II 1572 << SourceRange(TemplateParams->getTemplateLoc(), 1573 TemplateParams->getRAngleLoc()); 1574 } else { 1575 // There is an extraneous 'template<>' for this member. 1576 Diag(TemplateParams->getTemplateLoc(), 1577 diag::err_template_member_noparams) 1578 << II 1579 << SourceRange(TemplateParams->getTemplateLoc(), 1580 TemplateParams->getRAngleLoc()); 1581 } 1582 return 0; 1583 } 1584 1585 if (SS.isSet() && !SS.isInvalid()) { 1586 // The user provided a superfluous scope specifier inside a class 1587 // definition: 1588 // 1589 // class X { 1590 // int X::member; 1591 // }; 1592 if (DeclContext *DC = computeDeclContext(SS, false)) 1593 diagnoseQualifiedDeclaration(SS, DC, Name, D.getIdentifierLoc()); 1594 else 1595 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 1596 << Name << SS.getRange(); 1597 1598 SS.clear(); 1599 } 1600 1601 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 1602 InitStyle, AS); 1603 assert(Member && "HandleField never returns null"); 1604 } else { 1605 assert(InitStyle == ICIS_NoInit); 1606 1607 Member = HandleDeclarator(S, D, TemplateParameterLists); 1608 if (!Member) { 1609 return 0; 1610 } 1611 1612 // Non-instance-fields can't have a bitfield. 1613 if (BitWidth) { 1614 if (Member->isInvalidDecl()) { 1615 // don't emit another diagnostic. 1616 } else if (isa<VarDecl>(Member)) { 1617 // C++ 9.6p3: A bit-field shall not be a static member. 1618 // "static member 'A' cannot be a bit-field" 1619 Diag(Loc, diag::err_static_not_bitfield) 1620 << Name << BitWidth->getSourceRange(); 1621 } else if (isa<TypedefDecl>(Member)) { 1622 // "typedef member 'x' cannot be a bit-field" 1623 Diag(Loc, diag::err_typedef_not_bitfield) 1624 << Name << BitWidth->getSourceRange(); 1625 } else { 1626 // A function typedef ("typedef int f(); f a;"). 1627 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 1628 Diag(Loc, diag::err_not_integral_type_bitfield) 1629 << Name << cast<ValueDecl>(Member)->getType() 1630 << BitWidth->getSourceRange(); 1631 } 1632 1633 BitWidth = 0; 1634 Member->setInvalidDecl(); 1635 } 1636 1637 Member->setAccess(AS); 1638 1639 // If we have declared a member function template, set the access of the 1640 // templated declaration as well. 1641 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 1642 FunTmpl->getTemplatedDecl()->setAccess(AS); 1643 } 1644 1645 if (VS.isOverrideSpecified()) 1646 Member->addAttr(new (Context) OverrideAttr(VS.getOverrideLoc(), Context)); 1647 if (VS.isFinalSpecified()) 1648 Member->addAttr(new (Context) FinalAttr(VS.getFinalLoc(), Context)); 1649 1650 if (VS.getLastLocation().isValid()) { 1651 // Update the end location of a method that has a virt-specifiers. 1652 if (CXXMethodDecl *MD = dyn_cast_or_null<CXXMethodDecl>(Member)) 1653 MD->setRangeEnd(VS.getLastLocation()); 1654 } 1655 1656 CheckOverrideControl(Member); 1657 1658 assert((Name || isInstField) && "No identifier for non-field ?"); 1659 1660 if (isInstField) { 1661 FieldDecl *FD = cast<FieldDecl>(Member); 1662 FieldCollector->Add(FD); 1663 1664 if (Diags.getDiagnosticLevel(diag::warn_unused_private_field, 1665 FD->getLocation()) 1666 != DiagnosticsEngine::Ignored) { 1667 // Remember all explicit private FieldDecls that have a name, no side 1668 // effects and are not part of a dependent type declaration. 1669 if (!FD->isImplicit() && FD->getDeclName() && 1670 FD->getAccess() == AS_private && 1671 !FD->hasAttr<UnusedAttr>() && 1672 !FD->getParent()->isDependentContext() && 1673 !InitializationHasSideEffects(*FD)) 1674 UnusedPrivateFields.insert(FD); 1675 } 1676 } 1677 1678 return Member; 1679} 1680 1681namespace { 1682 class UninitializedFieldVisitor 1683 : public EvaluatedExprVisitor<UninitializedFieldVisitor> { 1684 Sema &S; 1685 ValueDecl *VD; 1686 public: 1687 typedef EvaluatedExprVisitor<UninitializedFieldVisitor> Inherited; 1688 UninitializedFieldVisitor(Sema &S, ValueDecl *VD) : Inherited(S.Context), 1689 S(S), VD(VD) { 1690 } 1691 1692 void HandleExpr(Expr *E) { 1693 if (!E) return; 1694 1695 // Expressions like x(x) sometimes lack the surrounding expressions 1696 // but need to be checked anyways. 1697 HandleValue(E); 1698 Visit(E); 1699 } 1700 1701 void HandleValue(Expr *E) { 1702 E = E->IgnoreParens(); 1703 1704 if (MemberExpr *ME = dyn_cast<MemberExpr>(E)) { 1705 if (isa<EnumConstantDecl>(ME->getMemberDecl())) 1706 return; 1707 Expr *Base = E; 1708 while (isa<MemberExpr>(Base)) { 1709 ME = dyn_cast<MemberExpr>(Base); 1710 if (VarDecl *VarD = dyn_cast<VarDecl>(ME->getMemberDecl())) 1711 if (VarD->hasGlobalStorage()) 1712 return; 1713 Base = ME->getBase(); 1714 } 1715 1716 if (VD == ME->getMemberDecl() && isa<CXXThisExpr>(Base)) { 1717 unsigned diag = VD->getType()->isReferenceType() 1718 ? diag::warn_reference_field_is_uninit 1719 : diag::warn_field_is_uninit; 1720 S.Diag(ME->getExprLoc(), diag); 1721 return; 1722 } 1723 } 1724 1725 if (ConditionalOperator *CO = dyn_cast<ConditionalOperator>(E)) { 1726 HandleValue(CO->getTrueExpr()); 1727 HandleValue(CO->getFalseExpr()); 1728 return; 1729 } 1730 1731 if (BinaryConditionalOperator *BCO = 1732 dyn_cast<BinaryConditionalOperator>(E)) { 1733 HandleValue(BCO->getCommon()); 1734 HandleValue(BCO->getFalseExpr()); 1735 return; 1736 } 1737 1738 if (BinaryOperator *BO = dyn_cast<BinaryOperator>(E)) { 1739 switch (BO->getOpcode()) { 1740 default: 1741 return; 1742 case(BO_PtrMemD): 1743 case(BO_PtrMemI): 1744 HandleValue(BO->getLHS()); 1745 return; 1746 case(BO_Comma): 1747 HandleValue(BO->getRHS()); 1748 return; 1749 } 1750 } 1751 } 1752 1753 void VisitImplicitCastExpr(ImplicitCastExpr *E) { 1754 if (E->getCastKind() == CK_LValueToRValue) 1755 HandleValue(E->getSubExpr()); 1756 1757 Inherited::VisitImplicitCastExpr(E); 1758 } 1759 1760 void VisitCXXMemberCallExpr(CXXMemberCallExpr *E) { 1761 Expr *Callee = E->getCallee(); 1762 if (isa<MemberExpr>(Callee)) 1763 HandleValue(Callee); 1764 1765 Inherited::VisitCXXMemberCallExpr(E); 1766 } 1767 }; 1768 static void CheckInitExprContainsUninitializedFields(Sema &S, Expr *E, 1769 ValueDecl *VD) { 1770 UninitializedFieldVisitor(S, VD).HandleExpr(E); 1771 } 1772} // namespace 1773 1774/// ActOnCXXInClassMemberInitializer - This is invoked after parsing an 1775/// in-class initializer for a non-static C++ class member, and after 1776/// instantiating an in-class initializer in a class template. Such actions 1777/// are deferred until the class is complete. 1778void 1779Sema::ActOnCXXInClassMemberInitializer(Decl *D, SourceLocation InitLoc, 1780 Expr *InitExpr) { 1781 FieldDecl *FD = cast<FieldDecl>(D); 1782 assert(FD->getInClassInitStyle() != ICIS_NoInit && 1783 "must set init style when field is created"); 1784 1785 if (!InitExpr) { 1786 FD->setInvalidDecl(); 1787 FD->removeInClassInitializer(); 1788 return; 1789 } 1790 1791 if (DiagnoseUnexpandedParameterPack(InitExpr, UPPC_Initializer)) { 1792 FD->setInvalidDecl(); 1793 FD->removeInClassInitializer(); 1794 return; 1795 } 1796 1797 if (getDiagnostics().getDiagnosticLevel(diag::warn_field_is_uninit, InitLoc) 1798 != DiagnosticsEngine::Ignored) { 1799 CheckInitExprContainsUninitializedFields(*this, InitExpr, FD); 1800 } 1801 1802 ExprResult Init = InitExpr; 1803 if (!FD->getType()->isDependentType() && !InitExpr->isTypeDependent() && 1804 !FD->getDeclContext()->isDependentContext()) { 1805 // Note: We don't type-check when we're in a dependent context, because 1806 // the initialization-substitution code does not properly handle direct 1807 // list initialization. We have the same hackaround for ctor-initializers. 1808 if (isa<InitListExpr>(InitExpr) && isStdInitializerList(FD->getType(), 0)) { 1809 Diag(FD->getLocation(), diag::warn_dangling_std_initializer_list) 1810 << /*at end of ctor*/1 << InitExpr->getSourceRange(); 1811 } 1812 Expr **Inits = &InitExpr; 1813 unsigned NumInits = 1; 1814 InitializedEntity Entity = InitializedEntity::InitializeMember(FD); 1815 InitializationKind Kind = FD->getInClassInitStyle() == ICIS_ListInit 1816 ? InitializationKind::CreateDirectList(InitExpr->getLocStart()) 1817 : InitializationKind::CreateCopy(InitExpr->getLocStart(), InitLoc); 1818 InitializationSequence Seq(*this, Entity, Kind, Inits, NumInits); 1819 Init = Seq.Perform(*this, Entity, Kind, MultiExprArg(Inits, NumInits)); 1820 if (Init.isInvalid()) { 1821 FD->setInvalidDecl(); 1822 return; 1823 } 1824 1825 CheckImplicitConversions(Init.get(), InitLoc); 1826 } 1827 1828 // C++0x [class.base.init]p7: 1829 // The initialization of each base and member constitutes a 1830 // full-expression. 1831 Init = MaybeCreateExprWithCleanups(Init); 1832 if (Init.isInvalid()) { 1833 FD->setInvalidDecl(); 1834 return; 1835 } 1836 1837 InitExpr = Init.release(); 1838 1839 FD->setInClassInitializer(InitExpr); 1840} 1841 1842/// \brief Find the direct and/or virtual base specifiers that 1843/// correspond to the given base type, for use in base initialization 1844/// within a constructor. 1845static bool FindBaseInitializer(Sema &SemaRef, 1846 CXXRecordDecl *ClassDecl, 1847 QualType BaseType, 1848 const CXXBaseSpecifier *&DirectBaseSpec, 1849 const CXXBaseSpecifier *&VirtualBaseSpec) { 1850 // First, check for a direct base class. 1851 DirectBaseSpec = 0; 1852 for (CXXRecordDecl::base_class_const_iterator Base 1853 = ClassDecl->bases_begin(); 1854 Base != ClassDecl->bases_end(); ++Base) { 1855 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 1856 // We found a direct base of this type. That's what we're 1857 // initializing. 1858 DirectBaseSpec = &*Base; 1859 break; 1860 } 1861 } 1862 1863 // Check for a virtual base class. 1864 // FIXME: We might be able to short-circuit this if we know in advance that 1865 // there are no virtual bases. 1866 VirtualBaseSpec = 0; 1867 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 1868 // We haven't found a base yet; search the class hierarchy for a 1869 // virtual base class. 1870 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1871 /*DetectVirtual=*/false); 1872 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 1873 BaseType, Paths)) { 1874 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1875 Path != Paths.end(); ++Path) { 1876 if (Path->back().Base->isVirtual()) { 1877 VirtualBaseSpec = Path->back().Base; 1878 break; 1879 } 1880 } 1881 } 1882 } 1883 1884 return DirectBaseSpec || VirtualBaseSpec; 1885} 1886 1887/// \brief Handle a C++ member initializer using braced-init-list syntax. 1888MemInitResult 1889Sema::ActOnMemInitializer(Decl *ConstructorD, 1890 Scope *S, 1891 CXXScopeSpec &SS, 1892 IdentifierInfo *MemberOrBase, 1893 ParsedType TemplateTypeTy, 1894 const DeclSpec &DS, 1895 SourceLocation IdLoc, 1896 Expr *InitList, 1897 SourceLocation EllipsisLoc) { 1898 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy, 1899 DS, IdLoc, InitList, 1900 EllipsisLoc); 1901} 1902 1903/// \brief Handle a C++ member initializer using parentheses syntax. 1904MemInitResult 1905Sema::ActOnMemInitializer(Decl *ConstructorD, 1906 Scope *S, 1907 CXXScopeSpec &SS, 1908 IdentifierInfo *MemberOrBase, 1909 ParsedType TemplateTypeTy, 1910 const DeclSpec &DS, 1911 SourceLocation IdLoc, 1912 SourceLocation LParenLoc, 1913 Expr **Args, unsigned NumArgs, 1914 SourceLocation RParenLoc, 1915 SourceLocation EllipsisLoc) { 1916 Expr *List = new (Context) ParenListExpr(Context, LParenLoc, 1917 llvm::makeArrayRef(Args, NumArgs), 1918 RParenLoc); 1919 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy, 1920 DS, IdLoc, List, EllipsisLoc); 1921} 1922 1923namespace { 1924 1925// Callback to only accept typo corrections that can be a valid C++ member 1926// intializer: either a non-static field member or a base class. 1927class MemInitializerValidatorCCC : public CorrectionCandidateCallback { 1928 public: 1929 explicit MemInitializerValidatorCCC(CXXRecordDecl *ClassDecl) 1930 : ClassDecl(ClassDecl) {} 1931 1932 virtual bool ValidateCandidate(const TypoCorrection &candidate) { 1933 if (NamedDecl *ND = candidate.getCorrectionDecl()) { 1934 if (FieldDecl *Member = dyn_cast<FieldDecl>(ND)) 1935 return Member->getDeclContext()->getRedeclContext()->Equals(ClassDecl); 1936 else 1937 return isa<TypeDecl>(ND); 1938 } 1939 return false; 1940 } 1941 1942 private: 1943 CXXRecordDecl *ClassDecl; 1944}; 1945 1946} 1947 1948/// \brief Handle a C++ member initializer. 1949MemInitResult 1950Sema::BuildMemInitializer(Decl *ConstructorD, 1951 Scope *S, 1952 CXXScopeSpec &SS, 1953 IdentifierInfo *MemberOrBase, 1954 ParsedType TemplateTypeTy, 1955 const DeclSpec &DS, 1956 SourceLocation IdLoc, 1957 Expr *Init, 1958 SourceLocation EllipsisLoc) { 1959 if (!ConstructorD) 1960 return true; 1961 1962 AdjustDeclIfTemplate(ConstructorD); 1963 1964 CXXConstructorDecl *Constructor 1965 = dyn_cast<CXXConstructorDecl>(ConstructorD); 1966 if (!Constructor) { 1967 // The user wrote a constructor initializer on a function that is 1968 // not a C++ constructor. Ignore the error for now, because we may 1969 // have more member initializers coming; we'll diagnose it just 1970 // once in ActOnMemInitializers. 1971 return true; 1972 } 1973 1974 CXXRecordDecl *ClassDecl = Constructor->getParent(); 1975 1976 // C++ [class.base.init]p2: 1977 // Names in a mem-initializer-id are looked up in the scope of the 1978 // constructor's class and, if not found in that scope, are looked 1979 // up in the scope containing the constructor's definition. 1980 // [Note: if the constructor's class contains a member with the 1981 // same name as a direct or virtual base class of the class, a 1982 // mem-initializer-id naming the member or base class and composed 1983 // of a single identifier refers to the class member. A 1984 // mem-initializer-id for the hidden base class may be specified 1985 // using a qualified name. ] 1986 if (!SS.getScopeRep() && !TemplateTypeTy) { 1987 // Look for a member, first. 1988 DeclContext::lookup_result Result 1989 = ClassDecl->lookup(MemberOrBase); 1990 if (Result.first != Result.second) { 1991 ValueDecl *Member; 1992 if ((Member = dyn_cast<FieldDecl>(*Result.first)) || 1993 (Member = dyn_cast<IndirectFieldDecl>(*Result.first))) { 1994 if (EllipsisLoc.isValid()) 1995 Diag(EllipsisLoc, diag::err_pack_expansion_member_init) 1996 << MemberOrBase 1997 << SourceRange(IdLoc, Init->getSourceRange().getEnd()); 1998 1999 return BuildMemberInitializer(Member, Init, IdLoc); 2000 } 2001 } 2002 } 2003 // It didn't name a member, so see if it names a class. 2004 QualType BaseType; 2005 TypeSourceInfo *TInfo = 0; 2006 2007 if (TemplateTypeTy) { 2008 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 2009 } else if (DS.getTypeSpecType() == TST_decltype) { 2010 BaseType = BuildDecltypeType(DS.getRepAsExpr(), DS.getTypeSpecTypeLoc()); 2011 } else { 2012 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 2013 LookupParsedName(R, S, &SS); 2014 2015 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 2016 if (!TyD) { 2017 if (R.isAmbiguous()) return true; 2018 2019 // We don't want access-control diagnostics here. 2020 R.suppressDiagnostics(); 2021 2022 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 2023 bool NotUnknownSpecialization = false; 2024 DeclContext *DC = computeDeclContext(SS, false); 2025 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 2026 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 2027 2028 if (!NotUnknownSpecialization) { 2029 // When the scope specifier can refer to a member of an unknown 2030 // specialization, we take it as a type name. 2031 BaseType = CheckTypenameType(ETK_None, SourceLocation(), 2032 SS.getWithLocInContext(Context), 2033 *MemberOrBase, IdLoc); 2034 if (BaseType.isNull()) 2035 return true; 2036 2037 R.clear(); 2038 R.setLookupName(MemberOrBase); 2039 } 2040 } 2041 2042 // If no results were found, try to correct typos. 2043 TypoCorrection Corr; 2044 MemInitializerValidatorCCC Validator(ClassDecl); 2045 if (R.empty() && BaseType.isNull() && 2046 (Corr = CorrectTypo(R.getLookupNameInfo(), R.getLookupKind(), S, &SS, 2047 Validator, ClassDecl))) { 2048 std::string CorrectedStr(Corr.getAsString(getLangOpts())); 2049 std::string CorrectedQuotedStr(Corr.getQuoted(getLangOpts())); 2050 if (FieldDecl *Member = Corr.getCorrectionDeclAs<FieldDecl>()) { 2051 // We have found a non-static data member with a similar 2052 // name to what was typed; complain and initialize that 2053 // member. 2054 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 2055 << MemberOrBase << true << CorrectedQuotedStr 2056 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr); 2057 Diag(Member->getLocation(), diag::note_previous_decl) 2058 << CorrectedQuotedStr; 2059 2060 return BuildMemberInitializer(Member, Init, IdLoc); 2061 } else if (TypeDecl *Type = Corr.getCorrectionDeclAs<TypeDecl>()) { 2062 const CXXBaseSpecifier *DirectBaseSpec; 2063 const CXXBaseSpecifier *VirtualBaseSpec; 2064 if (FindBaseInitializer(*this, ClassDecl, 2065 Context.getTypeDeclType(Type), 2066 DirectBaseSpec, VirtualBaseSpec)) { 2067 // We have found a direct or virtual base class with a 2068 // similar name to what was typed; complain and initialize 2069 // that base class. 2070 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 2071 << MemberOrBase << false << CorrectedQuotedStr 2072 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr); 2073 2074 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 2075 : VirtualBaseSpec; 2076 Diag(BaseSpec->getLocStart(), 2077 diag::note_base_class_specified_here) 2078 << BaseSpec->getType() 2079 << BaseSpec->getSourceRange(); 2080 2081 TyD = Type; 2082 } 2083 } 2084 } 2085 2086 if (!TyD && BaseType.isNull()) { 2087 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 2088 << MemberOrBase << SourceRange(IdLoc,Init->getSourceRange().getEnd()); 2089 return true; 2090 } 2091 } 2092 2093 if (BaseType.isNull()) { 2094 BaseType = Context.getTypeDeclType(TyD); 2095 if (SS.isSet()) { 2096 NestedNameSpecifier *Qualifier = 2097 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 2098 2099 // FIXME: preserve source range information 2100 BaseType = Context.getElaboratedType(ETK_None, Qualifier, BaseType); 2101 } 2102 } 2103 } 2104 2105 if (!TInfo) 2106 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 2107 2108 return BuildBaseInitializer(BaseType, TInfo, Init, ClassDecl, EllipsisLoc); 2109} 2110 2111/// Checks a member initializer expression for cases where reference (or 2112/// pointer) members are bound to by-value parameters (or their addresses). 2113static void CheckForDanglingReferenceOrPointer(Sema &S, ValueDecl *Member, 2114 Expr *Init, 2115 SourceLocation IdLoc) { 2116 QualType MemberTy = Member->getType(); 2117 2118 // We only handle pointers and references currently. 2119 // FIXME: Would this be relevant for ObjC object pointers? Or block pointers? 2120 if (!MemberTy->isReferenceType() && !MemberTy->isPointerType()) 2121 return; 2122 2123 const bool IsPointer = MemberTy->isPointerType(); 2124 if (IsPointer) { 2125 if (const UnaryOperator *Op 2126 = dyn_cast<UnaryOperator>(Init->IgnoreParenImpCasts())) { 2127 // The only case we're worried about with pointers requires taking the 2128 // address. 2129 if (Op->getOpcode() != UO_AddrOf) 2130 return; 2131 2132 Init = Op->getSubExpr(); 2133 } else { 2134 // We only handle address-of expression initializers for pointers. 2135 return; 2136 } 2137 } 2138 2139 if (isa<MaterializeTemporaryExpr>(Init->IgnoreParens())) { 2140 // Taking the address of a temporary will be diagnosed as a hard error. 2141 if (IsPointer) 2142 return; 2143 2144 S.Diag(Init->getExprLoc(), diag::warn_bind_ref_member_to_temporary) 2145 << Member << Init->getSourceRange(); 2146 } else if (const DeclRefExpr *DRE 2147 = dyn_cast<DeclRefExpr>(Init->IgnoreParens())) { 2148 // We only warn when referring to a non-reference parameter declaration. 2149 const ParmVarDecl *Parameter = dyn_cast<ParmVarDecl>(DRE->getDecl()); 2150 if (!Parameter || Parameter->getType()->isReferenceType()) 2151 return; 2152 2153 S.Diag(Init->getExprLoc(), 2154 IsPointer ? diag::warn_init_ptr_member_to_parameter_addr 2155 : diag::warn_bind_ref_member_to_parameter) 2156 << Member << Parameter << Init->getSourceRange(); 2157 } else { 2158 // Other initializers are fine. 2159 return; 2160 } 2161 2162 S.Diag(Member->getLocation(), diag::note_ref_or_ptr_member_declared_here) 2163 << (unsigned)IsPointer; 2164} 2165 2166MemInitResult 2167Sema::BuildMemberInitializer(ValueDecl *Member, Expr *Init, 2168 SourceLocation IdLoc) { 2169 FieldDecl *DirectMember = dyn_cast<FieldDecl>(Member); 2170 IndirectFieldDecl *IndirectMember = dyn_cast<IndirectFieldDecl>(Member); 2171 assert((DirectMember || IndirectMember) && 2172 "Member must be a FieldDecl or IndirectFieldDecl"); 2173 2174 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) 2175 return true; 2176 2177 if (Member->isInvalidDecl()) 2178 return true; 2179 2180 // Diagnose value-uses of fields to initialize themselves, e.g. 2181 // foo(foo) 2182 // where foo is not also a parameter to the constructor. 2183 // TODO: implement -Wuninitialized and fold this into that framework. 2184 Expr **Args; 2185 unsigned NumArgs; 2186 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { 2187 Args = ParenList->getExprs(); 2188 NumArgs = ParenList->getNumExprs(); 2189 } else { 2190 InitListExpr *InitList = cast<InitListExpr>(Init); 2191 Args = InitList->getInits(); 2192 NumArgs = InitList->getNumInits(); 2193 } 2194 2195 if (getDiagnostics().getDiagnosticLevel(diag::warn_field_is_uninit, IdLoc) 2196 != DiagnosticsEngine::Ignored) 2197 for (unsigned i = 0; i < NumArgs; ++i) 2198 // FIXME: Warn about the case when other fields are used before being 2199 // initialized. For example, let this field be the i'th field. When 2200 // initializing the i'th field, throw a warning if any of the >= i'th 2201 // fields are used, as they are not yet initialized. 2202 // Right now we are only handling the case where the i'th field uses 2203 // itself in its initializer. 2204 // Also need to take into account that some fields may be initialized by 2205 // in-class initializers, see C++11 [class.base.init]p9. 2206 CheckInitExprContainsUninitializedFields(*this, Args[i], Member); 2207 2208 SourceRange InitRange = Init->getSourceRange(); 2209 2210 if (Member->getType()->isDependentType() || Init->isTypeDependent()) { 2211 // Can't check initialization for a member of dependent type or when 2212 // any of the arguments are type-dependent expressions. 2213 DiscardCleanupsInEvaluationContext(); 2214 } else { 2215 bool InitList = false; 2216 if (isa<InitListExpr>(Init)) { 2217 InitList = true; 2218 Args = &Init; 2219 NumArgs = 1; 2220 2221 if (isStdInitializerList(Member->getType(), 0)) { 2222 Diag(IdLoc, diag::warn_dangling_std_initializer_list) 2223 << /*at end of ctor*/1 << InitRange; 2224 } 2225 } 2226 2227 // Initialize the member. 2228 InitializedEntity MemberEntity = 2229 DirectMember ? InitializedEntity::InitializeMember(DirectMember, 0) 2230 : InitializedEntity::InitializeMember(IndirectMember, 0); 2231 InitializationKind Kind = 2232 InitList ? InitializationKind::CreateDirectList(IdLoc) 2233 : InitializationKind::CreateDirect(IdLoc, InitRange.getBegin(), 2234 InitRange.getEnd()); 2235 2236 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args, NumArgs); 2237 ExprResult MemberInit = InitSeq.Perform(*this, MemberEntity, Kind, 2238 MultiExprArg(Args, NumArgs), 2239 0); 2240 if (MemberInit.isInvalid()) 2241 return true; 2242 2243 CheckImplicitConversions(MemberInit.get(), 2244 InitRange.getBegin()); 2245 2246 // C++0x [class.base.init]p7: 2247 // The initialization of each base and member constitutes a 2248 // full-expression. 2249 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 2250 if (MemberInit.isInvalid()) 2251 return true; 2252 2253 // If we are in a dependent context, template instantiation will 2254 // perform this type-checking again. Just save the arguments that we 2255 // received. 2256 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2257 // of the information that we have about the member 2258 // initializer. However, deconstructing the ASTs is a dicey process, 2259 // and this approach is far more likely to get the corner cases right. 2260 if (CurContext->isDependentContext()) { 2261 // The existing Init will do fine. 2262 } else { 2263 Init = MemberInit.get(); 2264 CheckForDanglingReferenceOrPointer(*this, Member, Init, IdLoc); 2265 } 2266 } 2267 2268 if (DirectMember) { 2269 return new (Context) CXXCtorInitializer(Context, DirectMember, IdLoc, 2270 InitRange.getBegin(), Init, 2271 InitRange.getEnd()); 2272 } else { 2273 return new (Context) CXXCtorInitializer(Context, IndirectMember, IdLoc, 2274 InitRange.getBegin(), Init, 2275 InitRange.getEnd()); 2276 } 2277} 2278 2279MemInitResult 2280Sema::BuildDelegatingInitializer(TypeSourceInfo *TInfo, Expr *Init, 2281 CXXRecordDecl *ClassDecl) { 2282 SourceLocation NameLoc = TInfo->getTypeLoc().getLocalSourceRange().getBegin(); 2283 if (!LangOpts.CPlusPlus0x) 2284 return Diag(NameLoc, diag::err_delegating_ctor) 2285 << TInfo->getTypeLoc().getLocalSourceRange(); 2286 Diag(NameLoc, diag::warn_cxx98_compat_delegating_ctor); 2287 2288 bool InitList = true; 2289 Expr **Args = &Init; 2290 unsigned NumArgs = 1; 2291 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { 2292 InitList = false; 2293 Args = ParenList->getExprs(); 2294 NumArgs = ParenList->getNumExprs(); 2295 } 2296 2297 SourceRange InitRange = Init->getSourceRange(); 2298 // Initialize the object. 2299 InitializedEntity DelegationEntity = InitializedEntity::InitializeDelegation( 2300 QualType(ClassDecl->getTypeForDecl(), 0)); 2301 InitializationKind Kind = 2302 InitList ? InitializationKind::CreateDirectList(NameLoc) 2303 : InitializationKind::CreateDirect(NameLoc, InitRange.getBegin(), 2304 InitRange.getEnd()); 2305 InitializationSequence InitSeq(*this, DelegationEntity, Kind, Args, NumArgs); 2306 ExprResult DelegationInit = InitSeq.Perform(*this, DelegationEntity, Kind, 2307 MultiExprArg(Args, NumArgs), 2308 0); 2309 if (DelegationInit.isInvalid()) 2310 return true; 2311 2312 assert(cast<CXXConstructExpr>(DelegationInit.get())->getConstructor() && 2313 "Delegating constructor with no target?"); 2314 2315 CheckImplicitConversions(DelegationInit.get(), InitRange.getBegin()); 2316 2317 // C++0x [class.base.init]p7: 2318 // The initialization of each base and member constitutes a 2319 // full-expression. 2320 DelegationInit = MaybeCreateExprWithCleanups(DelegationInit); 2321 if (DelegationInit.isInvalid()) 2322 return true; 2323 2324 // If we are in a dependent context, template instantiation will 2325 // perform this type-checking again. Just save the arguments that we 2326 // received in a ParenListExpr. 2327 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2328 // of the information that we have about the base 2329 // initializer. However, deconstructing the ASTs is a dicey process, 2330 // and this approach is far more likely to get the corner cases right. 2331 if (CurContext->isDependentContext()) 2332 DelegationInit = Owned(Init); 2333 2334 return new (Context) CXXCtorInitializer(Context, TInfo, InitRange.getBegin(), 2335 DelegationInit.takeAs<Expr>(), 2336 InitRange.getEnd()); 2337} 2338 2339MemInitResult 2340Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 2341 Expr *Init, CXXRecordDecl *ClassDecl, 2342 SourceLocation EllipsisLoc) { 2343 SourceLocation BaseLoc 2344 = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); 2345 2346 if (!BaseType->isDependentType() && !BaseType->isRecordType()) 2347 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 2348 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2349 2350 // C++ [class.base.init]p2: 2351 // [...] Unless the mem-initializer-id names a nonstatic data 2352 // member of the constructor's class or a direct or virtual base 2353 // of that class, the mem-initializer is ill-formed. A 2354 // mem-initializer-list can initialize a base class using any 2355 // name that denotes that base class type. 2356 bool Dependent = BaseType->isDependentType() || Init->isTypeDependent(); 2357 2358 SourceRange InitRange = Init->getSourceRange(); 2359 if (EllipsisLoc.isValid()) { 2360 // This is a pack expansion. 2361 if (!BaseType->containsUnexpandedParameterPack()) { 2362 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 2363 << SourceRange(BaseLoc, InitRange.getEnd()); 2364 2365 EllipsisLoc = SourceLocation(); 2366 } 2367 } else { 2368 // Check for any unexpanded parameter packs. 2369 if (DiagnoseUnexpandedParameterPack(BaseLoc, BaseTInfo, UPPC_Initializer)) 2370 return true; 2371 2372 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) 2373 return true; 2374 } 2375 2376 // Check for direct and virtual base classes. 2377 const CXXBaseSpecifier *DirectBaseSpec = 0; 2378 const CXXBaseSpecifier *VirtualBaseSpec = 0; 2379 if (!Dependent) { 2380 if (Context.hasSameUnqualifiedType(QualType(ClassDecl->getTypeForDecl(),0), 2381 BaseType)) 2382 return BuildDelegatingInitializer(BaseTInfo, Init, ClassDecl); 2383 2384 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 2385 VirtualBaseSpec); 2386 2387 // C++ [base.class.init]p2: 2388 // Unless the mem-initializer-id names a nonstatic data member of the 2389 // constructor's class or a direct or virtual base of that class, the 2390 // mem-initializer is ill-formed. 2391 if (!DirectBaseSpec && !VirtualBaseSpec) { 2392 // If the class has any dependent bases, then it's possible that 2393 // one of those types will resolve to the same type as 2394 // BaseType. Therefore, just treat this as a dependent base 2395 // class initialization. FIXME: Should we try to check the 2396 // initialization anyway? It seems odd. 2397 if (ClassDecl->hasAnyDependentBases()) 2398 Dependent = true; 2399 else 2400 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 2401 << BaseType << Context.getTypeDeclType(ClassDecl) 2402 << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2403 } 2404 } 2405 2406 if (Dependent) { 2407 DiscardCleanupsInEvaluationContext(); 2408 2409 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 2410 /*IsVirtual=*/false, 2411 InitRange.getBegin(), Init, 2412 InitRange.getEnd(), EllipsisLoc); 2413 } 2414 2415 // C++ [base.class.init]p2: 2416 // If a mem-initializer-id is ambiguous because it designates both 2417 // a direct non-virtual base class and an inherited virtual base 2418 // class, the mem-initializer is ill-formed. 2419 if (DirectBaseSpec && VirtualBaseSpec) 2420 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 2421 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2422 2423 CXXBaseSpecifier *BaseSpec = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 2424 if (!BaseSpec) 2425 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 2426 2427 // Initialize the base. 2428 bool InitList = true; 2429 Expr **Args = &Init; 2430 unsigned NumArgs = 1; 2431 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { 2432 InitList = false; 2433 Args = ParenList->getExprs(); 2434 NumArgs = ParenList->getNumExprs(); 2435 } 2436 2437 InitializedEntity BaseEntity = 2438 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 2439 InitializationKind Kind = 2440 InitList ? InitializationKind::CreateDirectList(BaseLoc) 2441 : InitializationKind::CreateDirect(BaseLoc, InitRange.getBegin(), 2442 InitRange.getEnd()); 2443 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args, NumArgs); 2444 ExprResult BaseInit = InitSeq.Perform(*this, BaseEntity, Kind, 2445 MultiExprArg(Args, NumArgs), 0); 2446 if (BaseInit.isInvalid()) 2447 return true; 2448 2449 CheckImplicitConversions(BaseInit.get(), InitRange.getBegin()); 2450 2451 // C++0x [class.base.init]p7: 2452 // The initialization of each base and member constitutes a 2453 // full-expression. 2454 BaseInit = MaybeCreateExprWithCleanups(BaseInit); 2455 if (BaseInit.isInvalid()) 2456 return true; 2457 2458 // If we are in a dependent context, template instantiation will 2459 // perform this type-checking again. Just save the arguments that we 2460 // received in a ParenListExpr. 2461 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2462 // of the information that we have about the base 2463 // initializer. However, deconstructing the ASTs is a dicey process, 2464 // and this approach is far more likely to get the corner cases right. 2465 if (CurContext->isDependentContext()) 2466 BaseInit = Owned(Init); 2467 2468 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 2469 BaseSpec->isVirtual(), 2470 InitRange.getBegin(), 2471 BaseInit.takeAs<Expr>(), 2472 InitRange.getEnd(), EllipsisLoc); 2473} 2474 2475// Create a static_cast\<T&&>(expr). 2476static Expr *CastForMoving(Sema &SemaRef, Expr *E) { 2477 QualType ExprType = E->getType(); 2478 QualType TargetType = SemaRef.Context.getRValueReferenceType(ExprType); 2479 SourceLocation ExprLoc = E->getLocStart(); 2480 TypeSourceInfo *TargetLoc = SemaRef.Context.getTrivialTypeSourceInfo( 2481 TargetType, ExprLoc); 2482 2483 return SemaRef.BuildCXXNamedCast(ExprLoc, tok::kw_static_cast, TargetLoc, E, 2484 SourceRange(ExprLoc, ExprLoc), 2485 E->getSourceRange()).take(); 2486} 2487 2488/// ImplicitInitializerKind - How an implicit base or member initializer should 2489/// initialize its base or member. 2490enum ImplicitInitializerKind { 2491 IIK_Default, 2492 IIK_Copy, 2493 IIK_Move 2494}; 2495 2496static bool 2497BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 2498 ImplicitInitializerKind ImplicitInitKind, 2499 CXXBaseSpecifier *BaseSpec, 2500 bool IsInheritedVirtualBase, 2501 CXXCtorInitializer *&CXXBaseInit) { 2502 InitializedEntity InitEntity 2503 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 2504 IsInheritedVirtualBase); 2505 2506 ExprResult BaseInit; 2507 2508 switch (ImplicitInitKind) { 2509 case IIK_Default: { 2510 InitializationKind InitKind 2511 = InitializationKind::CreateDefault(Constructor->getLocation()); 2512 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 2513 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, MultiExprArg()); 2514 break; 2515 } 2516 2517 case IIK_Move: 2518 case IIK_Copy: { 2519 bool Moving = ImplicitInitKind == IIK_Move; 2520 ParmVarDecl *Param = Constructor->getParamDecl(0); 2521 QualType ParamType = Param->getType().getNonReferenceType(); 2522 2523 Expr *CopyCtorArg = 2524 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), 2525 SourceLocation(), Param, false, 2526 Constructor->getLocation(), ParamType, 2527 VK_LValue, 0); 2528 2529 SemaRef.MarkDeclRefReferenced(cast<DeclRefExpr>(CopyCtorArg)); 2530 2531 // Cast to the base class to avoid ambiguities. 2532 QualType ArgTy = 2533 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), 2534 ParamType.getQualifiers()); 2535 2536 if (Moving) { 2537 CopyCtorArg = CastForMoving(SemaRef, CopyCtorArg); 2538 } 2539 2540 CXXCastPath BasePath; 2541 BasePath.push_back(BaseSpec); 2542 CopyCtorArg = SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, 2543 CK_UncheckedDerivedToBase, 2544 Moving ? VK_XValue : VK_LValue, 2545 &BasePath).take(); 2546 2547 InitializationKind InitKind 2548 = InitializationKind::CreateDirect(Constructor->getLocation(), 2549 SourceLocation(), SourceLocation()); 2550 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 2551 &CopyCtorArg, 1); 2552 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 2553 MultiExprArg(&CopyCtorArg, 1)); 2554 break; 2555 } 2556 } 2557 2558 BaseInit = SemaRef.MaybeCreateExprWithCleanups(BaseInit); 2559 if (BaseInit.isInvalid()) 2560 return true; 2561 2562 CXXBaseInit = 2563 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2564 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 2565 SourceLocation()), 2566 BaseSpec->isVirtual(), 2567 SourceLocation(), 2568 BaseInit.takeAs<Expr>(), 2569 SourceLocation(), 2570 SourceLocation()); 2571 2572 return false; 2573} 2574 2575static bool RefersToRValueRef(Expr *MemRef) { 2576 ValueDecl *Referenced = cast<MemberExpr>(MemRef)->getMemberDecl(); 2577 return Referenced->getType()->isRValueReferenceType(); 2578} 2579 2580static bool 2581BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 2582 ImplicitInitializerKind ImplicitInitKind, 2583 FieldDecl *Field, IndirectFieldDecl *Indirect, 2584 CXXCtorInitializer *&CXXMemberInit) { 2585 if (Field->isInvalidDecl()) 2586 return true; 2587 2588 SourceLocation Loc = Constructor->getLocation(); 2589 2590 if (ImplicitInitKind == IIK_Copy || ImplicitInitKind == IIK_Move) { 2591 bool Moving = ImplicitInitKind == IIK_Move; 2592 ParmVarDecl *Param = Constructor->getParamDecl(0); 2593 QualType ParamType = Param->getType().getNonReferenceType(); 2594 2595 // Suppress copying zero-width bitfields. 2596 if (Field->isBitField() && Field->getBitWidthValue(SemaRef.Context) == 0) 2597 return false; 2598 2599 Expr *MemberExprBase = 2600 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), 2601 SourceLocation(), Param, false, 2602 Loc, ParamType, VK_LValue, 0); 2603 2604 SemaRef.MarkDeclRefReferenced(cast<DeclRefExpr>(MemberExprBase)); 2605 2606 if (Moving) { 2607 MemberExprBase = CastForMoving(SemaRef, MemberExprBase); 2608 } 2609 2610 // Build a reference to this field within the parameter. 2611 CXXScopeSpec SS; 2612 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, 2613 Sema::LookupMemberName); 2614 MemberLookup.addDecl(Indirect ? cast<ValueDecl>(Indirect) 2615 : cast<ValueDecl>(Field), AS_public); 2616 MemberLookup.resolveKind(); 2617 ExprResult CtorArg 2618 = SemaRef.BuildMemberReferenceExpr(MemberExprBase, 2619 ParamType, Loc, 2620 /*IsArrow=*/false, 2621 SS, 2622 /*TemplateKWLoc=*/SourceLocation(), 2623 /*FirstQualifierInScope=*/0, 2624 MemberLookup, 2625 /*TemplateArgs=*/0); 2626 if (CtorArg.isInvalid()) 2627 return true; 2628 2629 // C++11 [class.copy]p15: 2630 // - if a member m has rvalue reference type T&&, it is direct-initialized 2631 // with static_cast<T&&>(x.m); 2632 if (RefersToRValueRef(CtorArg.get())) { 2633 CtorArg = CastForMoving(SemaRef, CtorArg.take()); 2634 } 2635 2636 // When the field we are copying is an array, create index variables for 2637 // each dimension of the array. We use these index variables to subscript 2638 // the source array, and other clients (e.g., CodeGen) will perform the 2639 // necessary iteration with these index variables. 2640 SmallVector<VarDecl *, 4> IndexVariables; 2641 QualType BaseType = Field->getType(); 2642 QualType SizeType = SemaRef.Context.getSizeType(); 2643 bool InitializingArray = false; 2644 while (const ConstantArrayType *Array 2645 = SemaRef.Context.getAsConstantArrayType(BaseType)) { 2646 InitializingArray = true; 2647 // Create the iteration variable for this array index. 2648 IdentifierInfo *IterationVarName = 0; 2649 { 2650 SmallString<8> Str; 2651 llvm::raw_svector_ostream OS(Str); 2652 OS << "__i" << IndexVariables.size(); 2653 IterationVarName = &SemaRef.Context.Idents.get(OS.str()); 2654 } 2655 VarDecl *IterationVar 2656 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, Loc, 2657 IterationVarName, SizeType, 2658 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc), 2659 SC_None, SC_None); 2660 IndexVariables.push_back(IterationVar); 2661 2662 // Create a reference to the iteration variable. 2663 ExprResult IterationVarRef 2664 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, VK_LValue, Loc); 2665 assert(!IterationVarRef.isInvalid() && 2666 "Reference to invented variable cannot fail!"); 2667 IterationVarRef = SemaRef.DefaultLvalueConversion(IterationVarRef.take()); 2668 assert(!IterationVarRef.isInvalid() && 2669 "Conversion of invented variable cannot fail!"); 2670 2671 // Subscript the array with this iteration variable. 2672 CtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(CtorArg.take(), Loc, 2673 IterationVarRef.take(), 2674 Loc); 2675 if (CtorArg.isInvalid()) 2676 return true; 2677 2678 BaseType = Array->getElementType(); 2679 } 2680 2681 // The array subscript expression is an lvalue, which is wrong for moving. 2682 if (Moving && InitializingArray) 2683 CtorArg = CastForMoving(SemaRef, CtorArg.take()); 2684 2685 // Construct the entity that we will be initializing. For an array, this 2686 // will be first element in the array, which may require several levels 2687 // of array-subscript entities. 2688 SmallVector<InitializedEntity, 4> Entities; 2689 Entities.reserve(1 + IndexVariables.size()); 2690 if (Indirect) 2691 Entities.push_back(InitializedEntity::InitializeMember(Indirect)); 2692 else 2693 Entities.push_back(InitializedEntity::InitializeMember(Field)); 2694 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I) 2695 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context, 2696 0, 2697 Entities.back())); 2698 2699 // Direct-initialize to use the copy constructor. 2700 InitializationKind InitKind = 2701 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); 2702 2703 Expr *CtorArgE = CtorArg.takeAs<Expr>(); 2704 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, 2705 &CtorArgE, 1); 2706 2707 ExprResult MemberInit 2708 = InitSeq.Perform(SemaRef, Entities.back(), InitKind, 2709 MultiExprArg(&CtorArgE, 1)); 2710 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2711 if (MemberInit.isInvalid()) 2712 return true; 2713 2714 if (Indirect) { 2715 assert(IndexVariables.size() == 0 && 2716 "Indirect field improperly initialized"); 2717 CXXMemberInit 2718 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 2719 Loc, Loc, 2720 MemberInit.takeAs<Expr>(), 2721 Loc); 2722 } else 2723 CXXMemberInit = CXXCtorInitializer::Create(SemaRef.Context, Field, Loc, 2724 Loc, MemberInit.takeAs<Expr>(), 2725 Loc, 2726 IndexVariables.data(), 2727 IndexVariables.size()); 2728 return false; 2729 } 2730 2731 assert(ImplicitInitKind == IIK_Default && "Unhandled implicit init kind!"); 2732 2733 QualType FieldBaseElementType = 2734 SemaRef.Context.getBaseElementType(Field->getType()); 2735 2736 if (FieldBaseElementType->isRecordType()) { 2737 InitializedEntity InitEntity 2738 = Indirect? InitializedEntity::InitializeMember(Indirect) 2739 : InitializedEntity::InitializeMember(Field); 2740 InitializationKind InitKind = 2741 InitializationKind::CreateDefault(Loc); 2742 2743 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 2744 ExprResult MemberInit = 2745 InitSeq.Perform(SemaRef, InitEntity, InitKind, MultiExprArg()); 2746 2747 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2748 if (MemberInit.isInvalid()) 2749 return true; 2750 2751 if (Indirect) 2752 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2753 Indirect, Loc, 2754 Loc, 2755 MemberInit.get(), 2756 Loc); 2757 else 2758 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2759 Field, Loc, Loc, 2760 MemberInit.get(), 2761 Loc); 2762 return false; 2763 } 2764 2765 if (!Field->getParent()->isUnion()) { 2766 if (FieldBaseElementType->isReferenceType()) { 2767 SemaRef.Diag(Constructor->getLocation(), 2768 diag::err_uninitialized_member_in_ctor) 2769 << (int)Constructor->isImplicit() 2770 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2771 << 0 << Field->getDeclName(); 2772 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2773 return true; 2774 } 2775 2776 if (FieldBaseElementType.isConstQualified()) { 2777 SemaRef.Diag(Constructor->getLocation(), 2778 diag::err_uninitialized_member_in_ctor) 2779 << (int)Constructor->isImplicit() 2780 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2781 << 1 << Field->getDeclName(); 2782 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2783 return true; 2784 } 2785 } 2786 2787 if (SemaRef.getLangOpts().ObjCAutoRefCount && 2788 FieldBaseElementType->isObjCRetainableType() && 2789 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_None && 2790 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_ExplicitNone) { 2791 // ARC: 2792 // Default-initialize Objective-C pointers to NULL. 2793 CXXMemberInit 2794 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 2795 Loc, Loc, 2796 new (SemaRef.Context) ImplicitValueInitExpr(Field->getType()), 2797 Loc); 2798 return false; 2799 } 2800 2801 // Nothing to initialize. 2802 CXXMemberInit = 0; 2803 return false; 2804} 2805 2806namespace { 2807struct BaseAndFieldInfo { 2808 Sema &S; 2809 CXXConstructorDecl *Ctor; 2810 bool AnyErrorsInInits; 2811 ImplicitInitializerKind IIK; 2812 llvm::DenseMap<const void *, CXXCtorInitializer*> AllBaseFields; 2813 SmallVector<CXXCtorInitializer*, 8> AllToInit; 2814 2815 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) 2816 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { 2817 bool Generated = Ctor->isImplicit() || Ctor->isDefaulted(); 2818 if (Generated && Ctor->isCopyConstructor()) 2819 IIK = IIK_Copy; 2820 else if (Generated && Ctor->isMoveConstructor()) 2821 IIK = IIK_Move; 2822 else 2823 IIK = IIK_Default; 2824 } 2825 2826 bool isImplicitCopyOrMove() const { 2827 switch (IIK) { 2828 case IIK_Copy: 2829 case IIK_Move: 2830 return true; 2831 2832 case IIK_Default: 2833 return false; 2834 } 2835 2836 llvm_unreachable("Invalid ImplicitInitializerKind!"); 2837 } 2838 2839 bool addFieldInitializer(CXXCtorInitializer *Init) { 2840 AllToInit.push_back(Init); 2841 2842 // Check whether this initializer makes the field "used". 2843 if (Init->getInit() && Init->getInit()->HasSideEffects(S.Context)) 2844 S.UnusedPrivateFields.remove(Init->getAnyMember()); 2845 2846 return false; 2847 } 2848}; 2849} 2850 2851/// \brief Determine whether the given indirect field declaration is somewhere 2852/// within an anonymous union. 2853static bool isWithinAnonymousUnion(IndirectFieldDecl *F) { 2854 for (IndirectFieldDecl::chain_iterator C = F->chain_begin(), 2855 CEnd = F->chain_end(); 2856 C != CEnd; ++C) 2857 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>((*C)->getDeclContext())) 2858 if (Record->isUnion()) 2859 return true; 2860 2861 return false; 2862} 2863 2864/// \brief Determine whether the given type is an incomplete or zero-lenfgth 2865/// array type. 2866static bool isIncompleteOrZeroLengthArrayType(ASTContext &Context, QualType T) { 2867 if (T->isIncompleteArrayType()) 2868 return true; 2869 2870 while (const ConstantArrayType *ArrayT = Context.getAsConstantArrayType(T)) { 2871 if (!ArrayT->getSize()) 2872 return true; 2873 2874 T = ArrayT->getElementType(); 2875 } 2876 2877 return false; 2878} 2879 2880static bool CollectFieldInitializer(Sema &SemaRef, BaseAndFieldInfo &Info, 2881 FieldDecl *Field, 2882 IndirectFieldDecl *Indirect = 0) { 2883 2884 // Overwhelmingly common case: we have a direct initializer for this field. 2885 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(Field)) 2886 return Info.addFieldInitializer(Init); 2887 2888 // C++11 [class.base.init]p8: if the entity is a non-static data member that 2889 // has a brace-or-equal-initializer, the entity is initialized as specified 2890 // in [dcl.init]. 2891 if (Field->hasInClassInitializer() && !Info.isImplicitCopyOrMove()) { 2892 CXXCtorInitializer *Init; 2893 if (Indirect) 2894 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 2895 SourceLocation(), 2896 SourceLocation(), 0, 2897 SourceLocation()); 2898 else 2899 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 2900 SourceLocation(), 2901 SourceLocation(), 0, 2902 SourceLocation()); 2903 return Info.addFieldInitializer(Init); 2904 } 2905 2906 // Don't build an implicit initializer for union members if none was 2907 // explicitly specified. 2908 if (Field->getParent()->isUnion() || 2909 (Indirect && isWithinAnonymousUnion(Indirect))) 2910 return false; 2911 2912 // Don't initialize incomplete or zero-length arrays. 2913 if (isIncompleteOrZeroLengthArrayType(SemaRef.Context, Field->getType())) 2914 return false; 2915 2916 // Don't try to build an implicit initializer if there were semantic 2917 // errors in any of the initializers (and therefore we might be 2918 // missing some that the user actually wrote). 2919 if (Info.AnyErrorsInInits || Field->isInvalidDecl()) 2920 return false; 2921 2922 CXXCtorInitializer *Init = 0; 2923 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, 2924 Indirect, Init)) 2925 return true; 2926 2927 if (!Init) 2928 return false; 2929 2930 return Info.addFieldInitializer(Init); 2931} 2932 2933bool 2934Sema::SetDelegatingInitializer(CXXConstructorDecl *Constructor, 2935 CXXCtorInitializer *Initializer) { 2936 assert(Initializer->isDelegatingInitializer()); 2937 Constructor->setNumCtorInitializers(1); 2938 CXXCtorInitializer **initializer = 2939 new (Context) CXXCtorInitializer*[1]; 2940 memcpy(initializer, &Initializer, sizeof (CXXCtorInitializer*)); 2941 Constructor->setCtorInitializers(initializer); 2942 2943 if (CXXDestructorDecl *Dtor = LookupDestructor(Constructor->getParent())) { 2944 MarkFunctionReferenced(Initializer->getSourceLocation(), Dtor); 2945 DiagnoseUseOfDecl(Dtor, Initializer->getSourceLocation()); 2946 } 2947 2948 DelegatingCtorDecls.push_back(Constructor); 2949 2950 return false; 2951} 2952 2953bool Sema::SetCtorInitializers(CXXConstructorDecl *Constructor, 2954 CXXCtorInitializer **Initializers, 2955 unsigned NumInitializers, 2956 bool AnyErrors) { 2957 if (Constructor->isDependentContext()) { 2958 // Just store the initializers as written, they will be checked during 2959 // instantiation. 2960 if (NumInitializers > 0) { 2961 Constructor->setNumCtorInitializers(NumInitializers); 2962 CXXCtorInitializer **baseOrMemberInitializers = 2963 new (Context) CXXCtorInitializer*[NumInitializers]; 2964 memcpy(baseOrMemberInitializers, Initializers, 2965 NumInitializers * sizeof(CXXCtorInitializer*)); 2966 Constructor->setCtorInitializers(baseOrMemberInitializers); 2967 } 2968 2969 return false; 2970 } 2971 2972 BaseAndFieldInfo Info(*this, Constructor, AnyErrors); 2973 2974 // We need to build the initializer AST according to order of construction 2975 // and not what user specified in the Initializers list. 2976 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 2977 if (!ClassDecl) 2978 return true; 2979 2980 bool HadError = false; 2981 2982 for (unsigned i = 0; i < NumInitializers; i++) { 2983 CXXCtorInitializer *Member = Initializers[i]; 2984 2985 if (Member->isBaseInitializer()) 2986 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 2987 else 2988 Info.AllBaseFields[Member->getAnyMember()] = Member; 2989 } 2990 2991 // Keep track of the direct virtual bases. 2992 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 2993 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 2994 E = ClassDecl->bases_end(); I != E; ++I) { 2995 if (I->isVirtual()) 2996 DirectVBases.insert(I); 2997 } 2998 2999 // Push virtual bases before others. 3000 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 3001 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 3002 3003 if (CXXCtorInitializer *Value 3004 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 3005 Info.AllToInit.push_back(Value); 3006 } else if (!AnyErrors) { 3007 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 3008 CXXCtorInitializer *CXXBaseInit; 3009 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 3010 VBase, IsInheritedVirtualBase, 3011 CXXBaseInit)) { 3012 HadError = true; 3013 continue; 3014 } 3015 3016 Info.AllToInit.push_back(CXXBaseInit); 3017 } 3018 } 3019 3020 // Non-virtual bases. 3021 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3022 E = ClassDecl->bases_end(); Base != E; ++Base) { 3023 // Virtuals are in the virtual base list and already constructed. 3024 if (Base->isVirtual()) 3025 continue; 3026 3027 if (CXXCtorInitializer *Value 3028 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 3029 Info.AllToInit.push_back(Value); 3030 } else if (!AnyErrors) { 3031 CXXCtorInitializer *CXXBaseInit; 3032 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 3033 Base, /*IsInheritedVirtualBase=*/false, 3034 CXXBaseInit)) { 3035 HadError = true; 3036 continue; 3037 } 3038 3039 Info.AllToInit.push_back(CXXBaseInit); 3040 } 3041 } 3042 3043 // Fields. 3044 for (DeclContext::decl_iterator Mem = ClassDecl->decls_begin(), 3045 MemEnd = ClassDecl->decls_end(); 3046 Mem != MemEnd; ++Mem) { 3047 if (FieldDecl *F = dyn_cast<FieldDecl>(*Mem)) { 3048 // C++ [class.bit]p2: 3049 // A declaration for a bit-field that omits the identifier declares an 3050 // unnamed bit-field. Unnamed bit-fields are not members and cannot be 3051 // initialized. 3052 if (F->isUnnamedBitfield()) 3053 continue; 3054 3055 // If we're not generating the implicit copy/move constructor, then we'll 3056 // handle anonymous struct/union fields based on their individual 3057 // indirect fields. 3058 if (F->isAnonymousStructOrUnion() && Info.IIK == IIK_Default) 3059 continue; 3060 3061 if (CollectFieldInitializer(*this, Info, F)) 3062 HadError = true; 3063 continue; 3064 } 3065 3066 // Beyond this point, we only consider default initialization. 3067 if (Info.IIK != IIK_Default) 3068 continue; 3069 3070 if (IndirectFieldDecl *F = dyn_cast<IndirectFieldDecl>(*Mem)) { 3071 if (F->getType()->isIncompleteArrayType()) { 3072 assert(ClassDecl->hasFlexibleArrayMember() && 3073 "Incomplete array type is not valid"); 3074 continue; 3075 } 3076 3077 // Initialize each field of an anonymous struct individually. 3078 if (CollectFieldInitializer(*this, Info, F->getAnonField(), F)) 3079 HadError = true; 3080 3081 continue; 3082 } 3083 } 3084 3085 NumInitializers = Info.AllToInit.size(); 3086 if (NumInitializers > 0) { 3087 Constructor->setNumCtorInitializers(NumInitializers); 3088 CXXCtorInitializer **baseOrMemberInitializers = 3089 new (Context) CXXCtorInitializer*[NumInitializers]; 3090 memcpy(baseOrMemberInitializers, Info.AllToInit.data(), 3091 NumInitializers * sizeof(CXXCtorInitializer*)); 3092 Constructor->setCtorInitializers(baseOrMemberInitializers); 3093 3094 // Constructors implicitly reference the base and member 3095 // destructors. 3096 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 3097 Constructor->getParent()); 3098 } 3099 3100 return HadError; 3101} 3102 3103static void *GetKeyForTopLevelField(FieldDecl *Field) { 3104 // For anonymous unions, use the class declaration as the key. 3105 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 3106 if (RT->getDecl()->isAnonymousStructOrUnion()) 3107 return static_cast<void *>(RT->getDecl()); 3108 } 3109 return static_cast<void *>(Field); 3110} 3111 3112static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 3113 return const_cast<Type*>(Context.getCanonicalType(BaseType).getTypePtr()); 3114} 3115 3116static void *GetKeyForMember(ASTContext &Context, 3117 CXXCtorInitializer *Member) { 3118 if (!Member->isAnyMemberInitializer()) 3119 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 3120 3121 // For fields injected into the class via declaration of an anonymous union, 3122 // use its anonymous union class declaration as the unique key. 3123 FieldDecl *Field = Member->getAnyMember(); 3124 3125 // If the field is a member of an anonymous struct or union, our key 3126 // is the anonymous record decl that's a direct child of the class. 3127 RecordDecl *RD = Field->getParent(); 3128 if (RD->isAnonymousStructOrUnion()) { 3129 while (true) { 3130 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 3131 if (Parent->isAnonymousStructOrUnion()) 3132 RD = Parent; 3133 else 3134 break; 3135 } 3136 3137 return static_cast<void *>(RD); 3138 } 3139 3140 return static_cast<void *>(Field); 3141} 3142 3143static void 3144DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 3145 const CXXConstructorDecl *Constructor, 3146 CXXCtorInitializer **Inits, 3147 unsigned NumInits) { 3148 if (Constructor->getDeclContext()->isDependentContext()) 3149 return; 3150 3151 // Don't check initializers order unless the warning is enabled at the 3152 // location of at least one initializer. 3153 bool ShouldCheckOrder = false; 3154 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 3155 CXXCtorInitializer *Init = Inits[InitIndex]; 3156 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order, 3157 Init->getSourceLocation()) 3158 != DiagnosticsEngine::Ignored) { 3159 ShouldCheckOrder = true; 3160 break; 3161 } 3162 } 3163 if (!ShouldCheckOrder) 3164 return; 3165 3166 // Build the list of bases and members in the order that they'll 3167 // actually be initialized. The explicit initializers should be in 3168 // this same order but may be missing things. 3169 SmallVector<const void*, 32> IdealInitKeys; 3170 3171 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 3172 3173 // 1. Virtual bases. 3174 for (CXXRecordDecl::base_class_const_iterator VBase = 3175 ClassDecl->vbases_begin(), 3176 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 3177 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 3178 3179 // 2. Non-virtual bases. 3180 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 3181 E = ClassDecl->bases_end(); Base != E; ++Base) { 3182 if (Base->isVirtual()) 3183 continue; 3184 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 3185 } 3186 3187 // 3. Direct fields. 3188 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 3189 E = ClassDecl->field_end(); Field != E; ++Field) { 3190 if (Field->isUnnamedBitfield()) 3191 continue; 3192 3193 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 3194 } 3195 3196 unsigned NumIdealInits = IdealInitKeys.size(); 3197 unsigned IdealIndex = 0; 3198 3199 CXXCtorInitializer *PrevInit = 0; 3200 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 3201 CXXCtorInitializer *Init = Inits[InitIndex]; 3202 void *InitKey = GetKeyForMember(SemaRef.Context, Init); 3203 3204 // Scan forward to try to find this initializer in the idealized 3205 // initializers list. 3206 for (; IdealIndex != NumIdealInits; ++IdealIndex) 3207 if (InitKey == IdealInitKeys[IdealIndex]) 3208 break; 3209 3210 // If we didn't find this initializer, it must be because we 3211 // scanned past it on a previous iteration. That can only 3212 // happen if we're out of order; emit a warning. 3213 if (IdealIndex == NumIdealInits && PrevInit) { 3214 Sema::SemaDiagnosticBuilder D = 3215 SemaRef.Diag(PrevInit->getSourceLocation(), 3216 diag::warn_initializer_out_of_order); 3217 3218 if (PrevInit->isAnyMemberInitializer()) 3219 D << 0 << PrevInit->getAnyMember()->getDeclName(); 3220 else 3221 D << 1 << PrevInit->getTypeSourceInfo()->getType(); 3222 3223 if (Init->isAnyMemberInitializer()) 3224 D << 0 << Init->getAnyMember()->getDeclName(); 3225 else 3226 D << 1 << Init->getTypeSourceInfo()->getType(); 3227 3228 // Move back to the initializer's location in the ideal list. 3229 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 3230 if (InitKey == IdealInitKeys[IdealIndex]) 3231 break; 3232 3233 assert(IdealIndex != NumIdealInits && 3234 "initializer not found in initializer list"); 3235 } 3236 3237 PrevInit = Init; 3238 } 3239} 3240 3241namespace { 3242bool CheckRedundantInit(Sema &S, 3243 CXXCtorInitializer *Init, 3244 CXXCtorInitializer *&PrevInit) { 3245 if (!PrevInit) { 3246 PrevInit = Init; 3247 return false; 3248 } 3249 3250 if (FieldDecl *Field = Init->getMember()) 3251 S.Diag(Init->getSourceLocation(), 3252 diag::err_multiple_mem_initialization) 3253 << Field->getDeclName() 3254 << Init->getSourceRange(); 3255 else { 3256 const Type *BaseClass = Init->getBaseClass(); 3257 assert(BaseClass && "neither field nor base"); 3258 S.Diag(Init->getSourceLocation(), 3259 diag::err_multiple_base_initialization) 3260 << QualType(BaseClass, 0) 3261 << Init->getSourceRange(); 3262 } 3263 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 3264 << 0 << PrevInit->getSourceRange(); 3265 3266 return true; 3267} 3268 3269typedef std::pair<NamedDecl *, CXXCtorInitializer *> UnionEntry; 3270typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 3271 3272bool CheckRedundantUnionInit(Sema &S, 3273 CXXCtorInitializer *Init, 3274 RedundantUnionMap &Unions) { 3275 FieldDecl *Field = Init->getAnyMember(); 3276 RecordDecl *Parent = Field->getParent(); 3277 NamedDecl *Child = Field; 3278 3279 while (Parent->isAnonymousStructOrUnion() || Parent->isUnion()) { 3280 if (Parent->isUnion()) { 3281 UnionEntry &En = Unions[Parent]; 3282 if (En.first && En.first != Child) { 3283 S.Diag(Init->getSourceLocation(), 3284 diag::err_multiple_mem_union_initialization) 3285 << Field->getDeclName() 3286 << Init->getSourceRange(); 3287 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 3288 << 0 << En.second->getSourceRange(); 3289 return true; 3290 } 3291 if (!En.first) { 3292 En.first = Child; 3293 En.second = Init; 3294 } 3295 if (!Parent->isAnonymousStructOrUnion()) 3296 return false; 3297 } 3298 3299 Child = Parent; 3300 Parent = cast<RecordDecl>(Parent->getDeclContext()); 3301 } 3302 3303 return false; 3304} 3305} 3306 3307/// ActOnMemInitializers - Handle the member initializers for a constructor. 3308void Sema::ActOnMemInitializers(Decl *ConstructorDecl, 3309 SourceLocation ColonLoc, 3310 CXXCtorInitializer **meminits, 3311 unsigned NumMemInits, 3312 bool AnyErrors) { 3313 if (!ConstructorDecl) 3314 return; 3315 3316 AdjustDeclIfTemplate(ConstructorDecl); 3317 3318 CXXConstructorDecl *Constructor 3319 = dyn_cast<CXXConstructorDecl>(ConstructorDecl); 3320 3321 if (!Constructor) { 3322 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 3323 return; 3324 } 3325 3326 CXXCtorInitializer **MemInits = 3327 reinterpret_cast<CXXCtorInitializer **>(meminits); 3328 3329 // Mapping for the duplicate initializers check. 3330 // For member initializers, this is keyed with a FieldDecl*. 3331 // For base initializers, this is keyed with a Type*. 3332 llvm::DenseMap<void*, CXXCtorInitializer *> Members; 3333 3334 // Mapping for the inconsistent anonymous-union initializers check. 3335 RedundantUnionMap MemberUnions; 3336 3337 bool HadError = false; 3338 for (unsigned i = 0; i < NumMemInits; i++) { 3339 CXXCtorInitializer *Init = MemInits[i]; 3340 3341 // Set the source order index. 3342 Init->setSourceOrder(i); 3343 3344 if (Init->isAnyMemberInitializer()) { 3345 FieldDecl *Field = Init->getAnyMember(); 3346 if (CheckRedundantInit(*this, Init, Members[Field]) || 3347 CheckRedundantUnionInit(*this, Init, MemberUnions)) 3348 HadError = true; 3349 } else if (Init->isBaseInitializer()) { 3350 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 3351 if (CheckRedundantInit(*this, Init, Members[Key])) 3352 HadError = true; 3353 } else { 3354 assert(Init->isDelegatingInitializer()); 3355 // This must be the only initializer 3356 if (NumMemInits != 1) { 3357 Diag(Init->getSourceLocation(), 3358 diag::err_delegating_initializer_alone) 3359 << Init->getSourceRange() << MemInits[i ? 0 : 1]->getSourceRange(); 3360 // We will treat this as being the only initializer. 3361 } 3362 SetDelegatingInitializer(Constructor, MemInits[i]); 3363 // Return immediately as the initializer is set. 3364 return; 3365 } 3366 } 3367 3368 if (HadError) 3369 return; 3370 3371 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 3372 3373 SetCtorInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 3374} 3375 3376void 3377Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 3378 CXXRecordDecl *ClassDecl) { 3379 // Ignore dependent contexts. Also ignore unions, since their members never 3380 // have destructors implicitly called. 3381 if (ClassDecl->isDependentContext() || ClassDecl->isUnion()) 3382 return; 3383 3384 // FIXME: all the access-control diagnostics are positioned on the 3385 // field/base declaration. That's probably good; that said, the 3386 // user might reasonably want to know why the destructor is being 3387 // emitted, and we currently don't say. 3388 3389 // Non-static data members. 3390 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 3391 E = ClassDecl->field_end(); I != E; ++I) { 3392 FieldDecl *Field = *I; 3393 if (Field->isInvalidDecl()) 3394 continue; 3395 3396 // Don't destroy incomplete or zero-length arrays. 3397 if (isIncompleteOrZeroLengthArrayType(Context, Field->getType())) 3398 continue; 3399 3400 QualType FieldType = Context.getBaseElementType(Field->getType()); 3401 3402 const RecordType* RT = FieldType->getAs<RecordType>(); 3403 if (!RT) 3404 continue; 3405 3406 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3407 if (FieldClassDecl->isInvalidDecl()) 3408 continue; 3409 if (FieldClassDecl->hasIrrelevantDestructor()) 3410 continue; 3411 // The destructor for an implicit anonymous union member is never invoked. 3412 if (FieldClassDecl->isUnion() && FieldClassDecl->isAnonymousStructOrUnion()) 3413 continue; 3414 3415 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl); 3416 assert(Dtor && "No dtor found for FieldClassDecl!"); 3417 CheckDestructorAccess(Field->getLocation(), Dtor, 3418 PDiag(diag::err_access_dtor_field) 3419 << Field->getDeclName() 3420 << FieldType); 3421 3422 MarkFunctionReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3423 DiagnoseUseOfDecl(Dtor, Location); 3424 } 3425 3426 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 3427 3428 // Bases. 3429 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3430 E = ClassDecl->bases_end(); Base != E; ++Base) { 3431 // Bases are always records in a well-formed non-dependent class. 3432 const RecordType *RT = Base->getType()->getAs<RecordType>(); 3433 3434 // Remember direct virtual bases. 3435 if (Base->isVirtual()) 3436 DirectVirtualBases.insert(RT); 3437 3438 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3439 // If our base class is invalid, we probably can't get its dtor anyway. 3440 if (BaseClassDecl->isInvalidDecl()) 3441 continue; 3442 if (BaseClassDecl->hasIrrelevantDestructor()) 3443 continue; 3444 3445 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 3446 assert(Dtor && "No dtor found for BaseClassDecl!"); 3447 3448 // FIXME: caret should be on the start of the class name 3449 CheckDestructorAccess(Base->getLocStart(), Dtor, 3450 PDiag(diag::err_access_dtor_base) 3451 << Base->getType() 3452 << Base->getSourceRange(), 3453 Context.getTypeDeclType(ClassDecl)); 3454 3455 MarkFunctionReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3456 DiagnoseUseOfDecl(Dtor, Location); 3457 } 3458 3459 // Virtual bases. 3460 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 3461 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 3462 3463 // Bases are always records in a well-formed non-dependent class. 3464 const RecordType *RT = VBase->getType()->castAs<RecordType>(); 3465 3466 // Ignore direct virtual bases. 3467 if (DirectVirtualBases.count(RT)) 3468 continue; 3469 3470 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3471 // If our base class is invalid, we probably can't get its dtor anyway. 3472 if (BaseClassDecl->isInvalidDecl()) 3473 continue; 3474 if (BaseClassDecl->hasIrrelevantDestructor()) 3475 continue; 3476 3477 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 3478 assert(Dtor && "No dtor found for BaseClassDecl!"); 3479 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 3480 PDiag(diag::err_access_dtor_vbase) 3481 << VBase->getType(), 3482 Context.getTypeDeclType(ClassDecl)); 3483 3484 MarkFunctionReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3485 DiagnoseUseOfDecl(Dtor, Location); 3486 } 3487} 3488 3489void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) { 3490 if (!CDtorDecl) 3491 return; 3492 3493 if (CXXConstructorDecl *Constructor 3494 = dyn_cast<CXXConstructorDecl>(CDtorDecl)) 3495 SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 3496} 3497 3498bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 3499 unsigned DiagID, AbstractDiagSelID SelID) { 3500 class NonAbstractTypeDiagnoser : public TypeDiagnoser { 3501 unsigned DiagID; 3502 AbstractDiagSelID SelID; 3503 3504 public: 3505 NonAbstractTypeDiagnoser(unsigned DiagID, AbstractDiagSelID SelID) 3506 : TypeDiagnoser(DiagID == 0), DiagID(DiagID), SelID(SelID) { } 3507 3508 virtual void diagnose(Sema &S, SourceLocation Loc, QualType T) { 3509 if (Suppressed) return; 3510 if (SelID == -1) 3511 S.Diag(Loc, DiagID) << T; 3512 else 3513 S.Diag(Loc, DiagID) << SelID << T; 3514 } 3515 } Diagnoser(DiagID, SelID); 3516 3517 return RequireNonAbstractType(Loc, T, Diagnoser); 3518} 3519 3520bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 3521 TypeDiagnoser &Diagnoser) { 3522 if (!getLangOpts().CPlusPlus) 3523 return false; 3524 3525 if (const ArrayType *AT = Context.getAsArrayType(T)) 3526 return RequireNonAbstractType(Loc, AT->getElementType(), Diagnoser); 3527 3528 if (const PointerType *PT = T->getAs<PointerType>()) { 3529 // Find the innermost pointer type. 3530 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 3531 PT = T; 3532 3533 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 3534 return RequireNonAbstractType(Loc, AT->getElementType(), Diagnoser); 3535 } 3536 3537 const RecordType *RT = T->getAs<RecordType>(); 3538 if (!RT) 3539 return false; 3540 3541 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 3542 3543 // We can't answer whether something is abstract until it has a 3544 // definition. If it's currently being defined, we'll walk back 3545 // over all the declarations when we have a full definition. 3546 const CXXRecordDecl *Def = RD->getDefinition(); 3547 if (!Def || Def->isBeingDefined()) 3548 return false; 3549 3550 if (!RD->isAbstract()) 3551 return false; 3552 3553 Diagnoser.diagnose(*this, Loc, T); 3554 DiagnoseAbstractType(RD); 3555 3556 return true; 3557} 3558 3559void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) { 3560 // Check if we've already emitted the list of pure virtual functions 3561 // for this class. 3562 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 3563 return; 3564 3565 CXXFinalOverriderMap FinalOverriders; 3566 RD->getFinalOverriders(FinalOverriders); 3567 3568 // Keep a set of seen pure methods so we won't diagnose the same method 3569 // more than once. 3570 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; 3571 3572 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 3573 MEnd = FinalOverriders.end(); 3574 M != MEnd; 3575 ++M) { 3576 for (OverridingMethods::iterator SO = M->second.begin(), 3577 SOEnd = M->second.end(); 3578 SO != SOEnd; ++SO) { 3579 // C++ [class.abstract]p4: 3580 // A class is abstract if it contains or inherits at least one 3581 // pure virtual function for which the final overrider is pure 3582 // virtual. 3583 3584 // 3585 if (SO->second.size() != 1) 3586 continue; 3587 3588 if (!SO->second.front().Method->isPure()) 3589 continue; 3590 3591 if (!SeenPureMethods.insert(SO->second.front().Method)) 3592 continue; 3593 3594 Diag(SO->second.front().Method->getLocation(), 3595 diag::note_pure_virtual_function) 3596 << SO->second.front().Method->getDeclName() << RD->getDeclName(); 3597 } 3598 } 3599 3600 if (!PureVirtualClassDiagSet) 3601 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 3602 PureVirtualClassDiagSet->insert(RD); 3603} 3604 3605namespace { 3606struct AbstractUsageInfo { 3607 Sema &S; 3608 CXXRecordDecl *Record; 3609 CanQualType AbstractType; 3610 bool Invalid; 3611 3612 AbstractUsageInfo(Sema &S, CXXRecordDecl *Record) 3613 : S(S), Record(Record), 3614 AbstractType(S.Context.getCanonicalType( 3615 S.Context.getTypeDeclType(Record))), 3616 Invalid(false) {} 3617 3618 void DiagnoseAbstractType() { 3619 if (Invalid) return; 3620 S.DiagnoseAbstractType(Record); 3621 Invalid = true; 3622 } 3623 3624 void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel); 3625}; 3626 3627struct CheckAbstractUsage { 3628 AbstractUsageInfo &Info; 3629 const NamedDecl *Ctx; 3630 3631 CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx) 3632 : Info(Info), Ctx(Ctx) {} 3633 3634 void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 3635 switch (TL.getTypeLocClass()) { 3636#define ABSTRACT_TYPELOC(CLASS, PARENT) 3637#define TYPELOC(CLASS, PARENT) \ 3638 case TypeLoc::CLASS: Check(cast<CLASS##TypeLoc>(TL), Sel); break; 3639#include "clang/AST/TypeLocNodes.def" 3640 } 3641 } 3642 3643 void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3644 Visit(TL.getResultLoc(), Sema::AbstractReturnType); 3645 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 3646 if (!TL.getArg(I)) 3647 continue; 3648 3649 TypeSourceInfo *TSI = TL.getArg(I)->getTypeSourceInfo(); 3650 if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType); 3651 } 3652 } 3653 3654 void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3655 Visit(TL.getElementLoc(), Sema::AbstractArrayType); 3656 } 3657 3658 void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3659 // Visit the type parameters from a permissive context. 3660 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 3661 TemplateArgumentLoc TAL = TL.getArgLoc(I); 3662 if (TAL.getArgument().getKind() == TemplateArgument::Type) 3663 if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo()) 3664 Visit(TSI->getTypeLoc(), Sema::AbstractNone); 3665 // TODO: other template argument types? 3666 } 3667 } 3668 3669 // Visit pointee types from a permissive context. 3670#define CheckPolymorphic(Type) \ 3671 void Check(Type TL, Sema::AbstractDiagSelID Sel) { \ 3672 Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \ 3673 } 3674 CheckPolymorphic(PointerTypeLoc) 3675 CheckPolymorphic(ReferenceTypeLoc) 3676 CheckPolymorphic(MemberPointerTypeLoc) 3677 CheckPolymorphic(BlockPointerTypeLoc) 3678 CheckPolymorphic(AtomicTypeLoc) 3679 3680 /// Handle all the types we haven't given a more specific 3681 /// implementation for above. 3682 void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 3683 // Every other kind of type that we haven't called out already 3684 // that has an inner type is either (1) sugar or (2) contains that 3685 // inner type in some way as a subobject. 3686 if (TypeLoc Next = TL.getNextTypeLoc()) 3687 return Visit(Next, Sel); 3688 3689 // If there's no inner type and we're in a permissive context, 3690 // don't diagnose. 3691 if (Sel == Sema::AbstractNone) return; 3692 3693 // Check whether the type matches the abstract type. 3694 QualType T = TL.getType(); 3695 if (T->isArrayType()) { 3696 Sel = Sema::AbstractArrayType; 3697 T = Info.S.Context.getBaseElementType(T); 3698 } 3699 CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType(); 3700 if (CT != Info.AbstractType) return; 3701 3702 // It matched; do some magic. 3703 if (Sel == Sema::AbstractArrayType) { 3704 Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type) 3705 << T << TL.getSourceRange(); 3706 } else { 3707 Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl) 3708 << Sel << T << TL.getSourceRange(); 3709 } 3710 Info.DiagnoseAbstractType(); 3711 } 3712}; 3713 3714void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL, 3715 Sema::AbstractDiagSelID Sel) { 3716 CheckAbstractUsage(*this, D).Visit(TL, Sel); 3717} 3718 3719} 3720 3721/// Check for invalid uses of an abstract type in a method declaration. 3722static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 3723 CXXMethodDecl *MD) { 3724 // No need to do the check on definitions, which require that 3725 // the return/param types be complete. 3726 if (MD->doesThisDeclarationHaveABody()) 3727 return; 3728 3729 // For safety's sake, just ignore it if we don't have type source 3730 // information. This should never happen for non-implicit methods, 3731 // but... 3732 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo()) 3733 Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone); 3734} 3735 3736/// Check for invalid uses of an abstract type within a class definition. 3737static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 3738 CXXRecordDecl *RD) { 3739 for (CXXRecordDecl::decl_iterator 3740 I = RD->decls_begin(), E = RD->decls_end(); I != E; ++I) { 3741 Decl *D = *I; 3742 if (D->isImplicit()) continue; 3743 3744 // Methods and method templates. 3745 if (isa<CXXMethodDecl>(D)) { 3746 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D)); 3747 } else if (isa<FunctionTemplateDecl>(D)) { 3748 FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl(); 3749 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD)); 3750 3751 // Fields and static variables. 3752 } else if (isa<FieldDecl>(D)) { 3753 FieldDecl *FD = cast<FieldDecl>(D); 3754 if (TypeSourceInfo *TSI = FD->getTypeSourceInfo()) 3755 Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType); 3756 } else if (isa<VarDecl>(D)) { 3757 VarDecl *VD = cast<VarDecl>(D); 3758 if (TypeSourceInfo *TSI = VD->getTypeSourceInfo()) 3759 Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType); 3760 3761 // Nested classes and class templates. 3762 } else if (isa<CXXRecordDecl>(D)) { 3763 CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D)); 3764 } else if (isa<ClassTemplateDecl>(D)) { 3765 CheckAbstractClassUsage(Info, 3766 cast<ClassTemplateDecl>(D)->getTemplatedDecl()); 3767 } 3768 } 3769} 3770 3771/// \brief Perform semantic checks on a class definition that has been 3772/// completing, introducing implicitly-declared members, checking for 3773/// abstract types, etc. 3774void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 3775 if (!Record) 3776 return; 3777 3778 if (Record->isAbstract() && !Record->isInvalidDecl()) { 3779 AbstractUsageInfo Info(*this, Record); 3780 CheckAbstractClassUsage(Info, Record); 3781 } 3782 3783 // If this is not an aggregate type and has no user-declared constructor, 3784 // complain about any non-static data members of reference or const scalar 3785 // type, since they will never get initializers. 3786 if (!Record->isInvalidDecl() && !Record->isDependentType() && 3787 !Record->isAggregate() && !Record->hasUserDeclaredConstructor() && 3788 !Record->isLambda()) { 3789 bool Complained = false; 3790 for (RecordDecl::field_iterator F = Record->field_begin(), 3791 FEnd = Record->field_end(); 3792 F != FEnd; ++F) { 3793 if (F->hasInClassInitializer() || F->isUnnamedBitfield()) 3794 continue; 3795 3796 if (F->getType()->isReferenceType() || 3797 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 3798 if (!Complained) { 3799 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 3800 << Record->getTagKind() << Record; 3801 Complained = true; 3802 } 3803 3804 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 3805 << F->getType()->isReferenceType() 3806 << F->getDeclName(); 3807 } 3808 } 3809 } 3810 3811 if (Record->isDynamicClass() && !Record->isDependentType()) 3812 DynamicClasses.push_back(Record); 3813 3814 if (Record->getIdentifier()) { 3815 // C++ [class.mem]p13: 3816 // If T is the name of a class, then each of the following shall have a 3817 // name different from T: 3818 // - every member of every anonymous union that is a member of class T. 3819 // 3820 // C++ [class.mem]p14: 3821 // In addition, if class T has a user-declared constructor (12.1), every 3822 // non-static data member of class T shall have a name different from T. 3823 for (DeclContext::lookup_result R = Record->lookup(Record->getDeclName()); 3824 R.first != R.second; ++R.first) { 3825 NamedDecl *D = *R.first; 3826 if ((isa<FieldDecl>(D) && Record->hasUserDeclaredConstructor()) || 3827 isa<IndirectFieldDecl>(D)) { 3828 Diag(D->getLocation(), diag::err_member_name_of_class) 3829 << D->getDeclName(); 3830 break; 3831 } 3832 } 3833 } 3834 3835 // Warn if the class has virtual methods but non-virtual public destructor. 3836 if (Record->isPolymorphic() && !Record->isDependentType()) { 3837 CXXDestructorDecl *dtor = Record->getDestructor(); 3838 if (!dtor || (!dtor->isVirtual() && dtor->getAccess() == AS_public)) 3839 Diag(dtor ? dtor->getLocation() : Record->getLocation(), 3840 diag::warn_non_virtual_dtor) << Context.getRecordType(Record); 3841 } 3842 3843 // See if a method overloads virtual methods in a base 3844 /// class without overriding any. 3845 if (!Record->isDependentType()) { 3846 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 3847 MEnd = Record->method_end(); 3848 M != MEnd; ++M) { 3849 if (!M->isStatic()) 3850 DiagnoseHiddenVirtualMethods(Record, *M); 3851 } 3852 } 3853 3854 // C++0x [dcl.constexpr]p8: A constexpr specifier for a non-static member 3855 // function that is not a constructor declares that member function to be 3856 // const. [...] The class of which that function is a member shall be 3857 // a literal type. 3858 // 3859 // If the class has virtual bases, any constexpr members will already have 3860 // been diagnosed by the checks performed on the member declaration, so 3861 // suppress this (less useful) diagnostic. 3862 if (LangOpts.CPlusPlus0x && !Record->isDependentType() && 3863 !Record->isLiteral() && !Record->getNumVBases()) { 3864 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 3865 MEnd = Record->method_end(); 3866 M != MEnd; ++M) { 3867 if (M->isConstexpr() && M->isInstance() && !isa<CXXConstructorDecl>(*M)) { 3868 switch (Record->getTemplateSpecializationKind()) { 3869 case TSK_ImplicitInstantiation: 3870 case TSK_ExplicitInstantiationDeclaration: 3871 case TSK_ExplicitInstantiationDefinition: 3872 // If a template instantiates to a non-literal type, but its members 3873 // instantiate to constexpr functions, the template is technically 3874 // ill-formed, but we allow it for sanity. 3875 continue; 3876 3877 case TSK_Undeclared: 3878 case TSK_ExplicitSpecialization: 3879 RequireLiteralType(M->getLocation(), Context.getRecordType(Record), 3880 diag::err_constexpr_method_non_literal); 3881 break; 3882 } 3883 3884 // Only produce one error per class. 3885 break; 3886 } 3887 } 3888 } 3889 3890 // Declare inherited constructors. We do this eagerly here because: 3891 // - The standard requires an eager diagnostic for conflicting inherited 3892 // constructors from different classes. 3893 // - The lazy declaration of the other implicit constructors is so as to not 3894 // waste space and performance on classes that are not meant to be 3895 // instantiated (e.g. meta-functions). This doesn't apply to classes that 3896 // have inherited constructors. 3897 DeclareInheritedConstructors(Record); 3898} 3899 3900void Sema::CheckExplicitlyDefaultedMethods(CXXRecordDecl *Record) { 3901 for (CXXRecordDecl::method_iterator MI = Record->method_begin(), 3902 ME = Record->method_end(); 3903 MI != ME; ++MI) 3904 if (!MI->isInvalidDecl() && MI->isExplicitlyDefaulted()) 3905 CheckExplicitlyDefaultedSpecialMember(*MI); 3906} 3907 3908/// Is the special member function which would be selected to perform the 3909/// specified operation on the specified class type a constexpr constructor? 3910static bool specialMemberIsConstexpr(Sema &S, CXXRecordDecl *ClassDecl, 3911 Sema::CXXSpecialMember CSM, 3912 bool ConstArg) { 3913 Sema::SpecialMemberOverloadResult *SMOR = 3914 S.LookupSpecialMember(ClassDecl, CSM, ConstArg, 3915 false, false, false, false); 3916 if (!SMOR || !SMOR->getMethod()) 3917 // A constructor we wouldn't select can't be "involved in initializing" 3918 // anything. 3919 return true; 3920 return SMOR->getMethod()->isConstexpr(); 3921} 3922 3923/// Determine whether the specified special member function would be constexpr 3924/// if it were implicitly defined. 3925static bool defaultedSpecialMemberIsConstexpr(Sema &S, CXXRecordDecl *ClassDecl, 3926 Sema::CXXSpecialMember CSM, 3927 bool ConstArg) { 3928 if (!S.getLangOpts().CPlusPlus0x) 3929 return false; 3930 3931 // C++11 [dcl.constexpr]p4: 3932 // In the definition of a constexpr constructor [...] 3933 switch (CSM) { 3934 case Sema::CXXDefaultConstructor: 3935 // Since default constructor lookup is essentially trivial (and cannot 3936 // involve, for instance, template instantiation), we compute whether a 3937 // defaulted default constructor is constexpr directly within CXXRecordDecl. 3938 // 3939 // This is important for performance; we need to know whether the default 3940 // constructor is constexpr to determine whether the type is a literal type. 3941 return ClassDecl->defaultedDefaultConstructorIsConstexpr(); 3942 3943 case Sema::CXXCopyConstructor: 3944 case Sema::CXXMoveConstructor: 3945 // For copy or move constructors, we need to perform overload resolution. 3946 break; 3947 3948 case Sema::CXXCopyAssignment: 3949 case Sema::CXXMoveAssignment: 3950 case Sema::CXXDestructor: 3951 case Sema::CXXInvalid: 3952 return false; 3953 } 3954 3955 // -- if the class is a non-empty union, or for each non-empty anonymous 3956 // union member of a non-union class, exactly one non-static data member 3957 // shall be initialized; [DR1359] 3958 // 3959 // If we squint, this is guaranteed, since exactly one non-static data member 3960 // will be initialized (if the constructor isn't deleted), we just don't know 3961 // which one. 3962 if (ClassDecl->isUnion()) 3963 return true; 3964 3965 // -- the class shall not have any virtual base classes; 3966 if (ClassDecl->getNumVBases()) 3967 return false; 3968 3969 // -- every constructor involved in initializing [...] base class 3970 // sub-objects shall be a constexpr constructor; 3971 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 3972 BEnd = ClassDecl->bases_end(); 3973 B != BEnd; ++B) { 3974 const RecordType *BaseType = B->getType()->getAs<RecordType>(); 3975 if (!BaseType) continue; 3976 3977 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 3978 if (!specialMemberIsConstexpr(S, BaseClassDecl, CSM, ConstArg)) 3979 return false; 3980 } 3981 3982 // -- every constructor involved in initializing non-static data members 3983 // [...] shall be a constexpr constructor; 3984 // -- every non-static data member and base class sub-object shall be 3985 // initialized 3986 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 3987 FEnd = ClassDecl->field_end(); 3988 F != FEnd; ++F) { 3989 if (F->isInvalidDecl()) 3990 continue; 3991 if (const RecordType *RecordTy = 3992 S.Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 3993 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 3994 if (!specialMemberIsConstexpr(S, FieldRecDecl, CSM, ConstArg)) 3995 return false; 3996 } 3997 } 3998 3999 // All OK, it's constexpr! 4000 return true; 4001} 4002 4003static Sema::ImplicitExceptionSpecification 4004computeImplicitExceptionSpec(Sema &S, SourceLocation Loc, CXXMethodDecl *MD) { 4005 switch (S.getSpecialMember(MD)) { 4006 case Sema::CXXDefaultConstructor: 4007 return S.ComputeDefaultedDefaultCtorExceptionSpec(Loc, MD); 4008 case Sema::CXXCopyConstructor: 4009 return S.ComputeDefaultedCopyCtorExceptionSpec(MD); 4010 case Sema::CXXCopyAssignment: 4011 return S.ComputeDefaultedCopyAssignmentExceptionSpec(MD); 4012 case Sema::CXXMoveConstructor: 4013 return S.ComputeDefaultedMoveCtorExceptionSpec(MD); 4014 case Sema::CXXMoveAssignment: 4015 return S.ComputeDefaultedMoveAssignmentExceptionSpec(MD); 4016 case Sema::CXXDestructor: 4017 return S.ComputeDefaultedDtorExceptionSpec(MD); 4018 case Sema::CXXInvalid: 4019 break; 4020 } 4021 llvm_unreachable("only special members have implicit exception specs"); 4022} 4023 4024static void 4025updateExceptionSpec(Sema &S, FunctionDecl *FD, const FunctionProtoType *FPT, 4026 const Sema::ImplicitExceptionSpecification &ExceptSpec) { 4027 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo(); 4028 ExceptSpec.getEPI(EPI); 4029 const FunctionProtoType *NewFPT = cast<FunctionProtoType>( 4030 S.Context.getFunctionType(FPT->getResultType(), FPT->arg_type_begin(), 4031 FPT->getNumArgs(), EPI)); 4032 FD->setType(QualType(NewFPT, 0)); 4033} 4034 4035void Sema::EvaluateImplicitExceptionSpec(SourceLocation Loc, CXXMethodDecl *MD) { 4036 const FunctionProtoType *FPT = MD->getType()->castAs<FunctionProtoType>(); 4037 if (FPT->getExceptionSpecType() != EST_Unevaluated) 4038 return; 4039 4040 // Evaluate the exception specification. 4041 ImplicitExceptionSpecification ExceptSpec = 4042 computeImplicitExceptionSpec(*this, Loc, MD); 4043 4044 // Update the type of the special member to use it. 4045 updateExceptionSpec(*this, MD, FPT, ExceptSpec); 4046 4047 // A user-provided destructor can be defined outside the class. When that 4048 // happens, be sure to update the exception specification on both 4049 // declarations. 4050 const FunctionProtoType *CanonicalFPT = 4051 MD->getCanonicalDecl()->getType()->castAs<FunctionProtoType>(); 4052 if (CanonicalFPT->getExceptionSpecType() == EST_Unevaluated) 4053 updateExceptionSpec(*this, MD->getCanonicalDecl(), 4054 CanonicalFPT, ExceptSpec); 4055} 4056 4057static bool isImplicitCopyCtorArgConst(Sema &S, CXXRecordDecl *ClassDecl); 4058static bool isImplicitCopyAssignmentArgConst(Sema &S, CXXRecordDecl *ClassDecl); 4059 4060void Sema::CheckExplicitlyDefaultedSpecialMember(CXXMethodDecl *MD) { 4061 CXXRecordDecl *RD = MD->getParent(); 4062 CXXSpecialMember CSM = getSpecialMember(MD); 4063 4064 assert(MD->isExplicitlyDefaulted() && CSM != CXXInvalid && 4065 "not an explicitly-defaulted special member"); 4066 4067 // Whether this was the first-declared instance of the constructor. 4068 // This affects whether we implicitly add an exception spec and constexpr. 4069 bool First = MD == MD->getCanonicalDecl(); 4070 4071 bool HadError = false; 4072 4073 // C++11 [dcl.fct.def.default]p1: 4074 // A function that is explicitly defaulted shall 4075 // -- be a special member function (checked elsewhere), 4076 // -- have the same type (except for ref-qualifiers, and except that a 4077 // copy operation can take a non-const reference) as an implicit 4078 // declaration, and 4079 // -- not have default arguments. 4080 unsigned ExpectedParams = 1; 4081 if (CSM == CXXDefaultConstructor || CSM == CXXDestructor) 4082 ExpectedParams = 0; 4083 if (MD->getNumParams() != ExpectedParams) { 4084 // This also checks for default arguments: a copy or move constructor with a 4085 // default argument is classified as a default constructor, and assignment 4086 // operations and destructors can't have default arguments. 4087 Diag(MD->getLocation(), diag::err_defaulted_special_member_params) 4088 << CSM << MD->getSourceRange(); 4089 HadError = true; 4090 } 4091 4092 const FunctionProtoType *Type = MD->getType()->getAs<FunctionProtoType>(); 4093 4094 // Compute argument constness, constexpr, and triviality. 4095 bool CanHaveConstParam = false; 4096 bool Trivial = false; 4097 switch (CSM) { 4098 case CXXDefaultConstructor: 4099 Trivial = RD->hasTrivialDefaultConstructor(); 4100 break; 4101 case CXXCopyConstructor: 4102 CanHaveConstParam = isImplicitCopyCtorArgConst(*this, RD); 4103 Trivial = RD->hasTrivialCopyConstructor(); 4104 break; 4105 case CXXCopyAssignment: 4106 CanHaveConstParam = isImplicitCopyAssignmentArgConst(*this, RD); 4107 Trivial = RD->hasTrivialCopyAssignment(); 4108 break; 4109 case CXXMoveConstructor: 4110 Trivial = RD->hasTrivialMoveConstructor(); 4111 break; 4112 case CXXMoveAssignment: 4113 Trivial = RD->hasTrivialMoveAssignment(); 4114 break; 4115 case CXXDestructor: 4116 Trivial = RD->hasTrivialDestructor(); 4117 break; 4118 case CXXInvalid: 4119 llvm_unreachable("non-special member explicitly defaulted!"); 4120 } 4121 4122 QualType ReturnType = Context.VoidTy; 4123 if (CSM == CXXCopyAssignment || CSM == CXXMoveAssignment) { 4124 // Check for return type matching. 4125 ReturnType = Type->getResultType(); 4126 QualType ExpectedReturnType = 4127 Context.getLValueReferenceType(Context.getTypeDeclType(RD)); 4128 if (!Context.hasSameType(ReturnType, ExpectedReturnType)) { 4129 Diag(MD->getLocation(), diag::err_defaulted_special_member_return_type) 4130 << (CSM == CXXMoveAssignment) << ExpectedReturnType; 4131 HadError = true; 4132 } 4133 4134 // A defaulted special member cannot have cv-qualifiers. 4135 if (Type->getTypeQuals()) { 4136 Diag(MD->getLocation(), diag::err_defaulted_special_member_quals) 4137 << (CSM == CXXMoveAssignment); 4138 HadError = true; 4139 } 4140 } 4141 4142 // Check for parameter type matching. 4143 QualType ArgType = ExpectedParams ? Type->getArgType(0) : QualType(); 4144 bool HasConstParam = false; 4145 if (ExpectedParams && ArgType->isReferenceType()) { 4146 // Argument must be reference to possibly-const T. 4147 QualType ReferentType = ArgType->getPointeeType(); 4148 HasConstParam = ReferentType.isConstQualified(); 4149 4150 if (ReferentType.isVolatileQualified()) { 4151 Diag(MD->getLocation(), 4152 diag::err_defaulted_special_member_volatile_param) << CSM; 4153 HadError = true; 4154 } 4155 4156 if (HasConstParam && !CanHaveConstParam) { 4157 if (CSM == CXXCopyConstructor || CSM == CXXCopyAssignment) { 4158 Diag(MD->getLocation(), 4159 diag::err_defaulted_special_member_copy_const_param) 4160 << (CSM == CXXCopyAssignment); 4161 // FIXME: Explain why this special member can't be const. 4162 } else { 4163 Diag(MD->getLocation(), 4164 diag::err_defaulted_special_member_move_const_param) 4165 << (CSM == CXXMoveAssignment); 4166 } 4167 HadError = true; 4168 } 4169 4170 // If a function is explicitly defaulted on its first declaration, it shall 4171 // have the same parameter type as if it had been implicitly declared. 4172 // (Presumably this is to prevent it from being trivial?) 4173 if (!HasConstParam && CanHaveConstParam && First) 4174 Diag(MD->getLocation(), 4175 diag::err_defaulted_special_member_copy_non_const_param) 4176 << (CSM == CXXCopyAssignment); 4177 } else if (ExpectedParams) { 4178 // A copy assignment operator can take its argument by value, but a 4179 // defaulted one cannot. 4180 assert(CSM == CXXCopyAssignment && "unexpected non-ref argument"); 4181 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_not_ref); 4182 HadError = true; 4183 } 4184 4185 // Rebuild the type with the implicit exception specification added, if we 4186 // are going to need it. 4187 const FunctionProtoType *ImplicitType = 0; 4188 if (First || Type->hasExceptionSpec()) { 4189 FunctionProtoType::ExtProtoInfo EPI = Type->getExtProtoInfo(); 4190 computeImplicitExceptionSpec(*this, MD->getLocation(), MD).getEPI(EPI); 4191 ImplicitType = cast<FunctionProtoType>( 4192 Context.getFunctionType(ReturnType, &ArgType, ExpectedParams, EPI)); 4193 } 4194 4195 // C++11 [dcl.fct.def.default]p2: 4196 // An explicitly-defaulted function may be declared constexpr only if it 4197 // would have been implicitly declared as constexpr, 4198 // Do not apply this rule to members of class templates, since core issue 1358 4199 // makes such functions always instantiate to constexpr functions. For 4200 // non-constructors, this is checked elsewhere. 4201 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, RD, CSM, 4202 HasConstParam); 4203 if (isa<CXXConstructorDecl>(MD) && MD->isConstexpr() && !Constexpr && 4204 MD->getTemplatedKind() == FunctionDecl::TK_NonTemplate) { 4205 Diag(MD->getLocStart(), diag::err_incorrect_defaulted_constexpr) << CSM; 4206 // FIXME: Explain why the constructor can't be constexpr. 4207 HadError = true; 4208 } 4209 // and may have an explicit exception-specification only if it is compatible 4210 // with the exception-specification on the implicit declaration. 4211 if (Type->hasExceptionSpec() && 4212 CheckEquivalentExceptionSpec( 4213 PDiag(diag::err_incorrect_defaulted_exception_spec) << CSM, 4214 PDiag(), ImplicitType, SourceLocation(), Type, MD->getLocation())) 4215 HadError = true; 4216 4217 // If a function is explicitly defaulted on its first declaration, 4218 if (First) { 4219 // -- it is implicitly considered to be constexpr if the implicit 4220 // definition would be, 4221 MD->setConstexpr(Constexpr); 4222 4223 // -- it is implicitly considered to have the same exception-specification 4224 // as if it had been implicitly declared, 4225 MD->setType(QualType(ImplicitType, 0)); 4226 4227 // Such a function is also trivial if the implicitly-declared function 4228 // would have been. 4229 MD->setTrivial(Trivial); 4230 } 4231 4232 if (ShouldDeleteSpecialMember(MD, CSM)) { 4233 if (First) { 4234 MD->setDeletedAsWritten(); 4235 } else { 4236 // C++11 [dcl.fct.def.default]p4: 4237 // [For a] user-provided explicitly-defaulted function [...] if such a 4238 // function is implicitly defined as deleted, the program is ill-formed. 4239 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) << CSM; 4240 HadError = true; 4241 } 4242 } 4243 4244 if (HadError) 4245 MD->setInvalidDecl(); 4246} 4247 4248namespace { 4249struct SpecialMemberDeletionInfo { 4250 Sema &S; 4251 CXXMethodDecl *MD; 4252 Sema::CXXSpecialMember CSM; 4253 bool Diagnose; 4254 4255 // Properties of the special member, computed for convenience. 4256 bool IsConstructor, IsAssignment, IsMove, ConstArg, VolatileArg; 4257 SourceLocation Loc; 4258 4259 bool AllFieldsAreConst; 4260 4261 SpecialMemberDeletionInfo(Sema &S, CXXMethodDecl *MD, 4262 Sema::CXXSpecialMember CSM, bool Diagnose) 4263 : S(S), MD(MD), CSM(CSM), Diagnose(Diagnose), 4264 IsConstructor(false), IsAssignment(false), IsMove(false), 4265 ConstArg(false), VolatileArg(false), Loc(MD->getLocation()), 4266 AllFieldsAreConst(true) { 4267 switch (CSM) { 4268 case Sema::CXXDefaultConstructor: 4269 case Sema::CXXCopyConstructor: 4270 IsConstructor = true; 4271 break; 4272 case Sema::CXXMoveConstructor: 4273 IsConstructor = true; 4274 IsMove = true; 4275 break; 4276 case Sema::CXXCopyAssignment: 4277 IsAssignment = true; 4278 break; 4279 case Sema::CXXMoveAssignment: 4280 IsAssignment = true; 4281 IsMove = true; 4282 break; 4283 case Sema::CXXDestructor: 4284 break; 4285 case Sema::CXXInvalid: 4286 llvm_unreachable("invalid special member kind"); 4287 } 4288 4289 if (MD->getNumParams()) { 4290 ConstArg = MD->getParamDecl(0)->getType().isConstQualified(); 4291 VolatileArg = MD->getParamDecl(0)->getType().isVolatileQualified(); 4292 } 4293 } 4294 4295 bool inUnion() const { return MD->getParent()->isUnion(); } 4296 4297 /// Look up the corresponding special member in the given class. 4298 Sema::SpecialMemberOverloadResult *lookupIn(CXXRecordDecl *Class, 4299 unsigned Quals) { 4300 unsigned TQ = MD->getTypeQualifiers(); 4301 // cv-qualifiers on class members don't affect default ctor / dtor calls. 4302 if (CSM == Sema::CXXDefaultConstructor || CSM == Sema::CXXDestructor) 4303 Quals = 0; 4304 return S.LookupSpecialMember(Class, CSM, 4305 ConstArg || (Quals & Qualifiers::Const), 4306 VolatileArg || (Quals & Qualifiers::Volatile), 4307 MD->getRefQualifier() == RQ_RValue, 4308 TQ & Qualifiers::Const, 4309 TQ & Qualifiers::Volatile); 4310 } 4311 4312 typedef llvm::PointerUnion<CXXBaseSpecifier*, FieldDecl*> Subobject; 4313 4314 bool shouldDeleteForBase(CXXBaseSpecifier *Base); 4315 bool shouldDeleteForField(FieldDecl *FD); 4316 bool shouldDeleteForAllConstMembers(); 4317 4318 bool shouldDeleteForClassSubobject(CXXRecordDecl *Class, Subobject Subobj, 4319 unsigned Quals); 4320 bool shouldDeleteForSubobjectCall(Subobject Subobj, 4321 Sema::SpecialMemberOverloadResult *SMOR, 4322 bool IsDtorCallInCtor); 4323 4324 bool isAccessible(Subobject Subobj, CXXMethodDecl *D); 4325}; 4326} 4327 4328/// Is the given special member inaccessible when used on the given 4329/// sub-object. 4330bool SpecialMemberDeletionInfo::isAccessible(Subobject Subobj, 4331 CXXMethodDecl *target) { 4332 /// If we're operating on a base class, the object type is the 4333 /// type of this special member. 4334 QualType objectTy; 4335 AccessSpecifier access = target->getAccess(); 4336 if (CXXBaseSpecifier *base = Subobj.dyn_cast<CXXBaseSpecifier*>()) { 4337 objectTy = S.Context.getTypeDeclType(MD->getParent()); 4338 access = CXXRecordDecl::MergeAccess(base->getAccessSpecifier(), access); 4339 4340 // If we're operating on a field, the object type is the type of the field. 4341 } else { 4342 objectTy = S.Context.getTypeDeclType(target->getParent()); 4343 } 4344 4345 return S.isSpecialMemberAccessibleForDeletion(target, access, objectTy); 4346} 4347 4348/// Check whether we should delete a special member due to the implicit 4349/// definition containing a call to a special member of a subobject. 4350bool SpecialMemberDeletionInfo::shouldDeleteForSubobjectCall( 4351 Subobject Subobj, Sema::SpecialMemberOverloadResult *SMOR, 4352 bool IsDtorCallInCtor) { 4353 CXXMethodDecl *Decl = SMOR->getMethod(); 4354 FieldDecl *Field = Subobj.dyn_cast<FieldDecl*>(); 4355 4356 int DiagKind = -1; 4357 4358 if (SMOR->getKind() == Sema::SpecialMemberOverloadResult::NoMemberOrDeleted) 4359 DiagKind = !Decl ? 0 : 1; 4360 else if (SMOR->getKind() == Sema::SpecialMemberOverloadResult::Ambiguous) 4361 DiagKind = 2; 4362 else if (!isAccessible(Subobj, Decl)) 4363 DiagKind = 3; 4364 else if (!IsDtorCallInCtor && Field && Field->getParent()->isUnion() && 4365 !Decl->isTrivial()) { 4366 // A member of a union must have a trivial corresponding special member. 4367 // As a weird special case, a destructor call from a union's constructor 4368 // must be accessible and non-deleted, but need not be trivial. Such a 4369 // destructor is never actually called, but is semantically checked as 4370 // if it were. 4371 DiagKind = 4; 4372 } 4373 4374 if (DiagKind == -1) 4375 return false; 4376 4377 if (Diagnose) { 4378 if (Field) { 4379 S.Diag(Field->getLocation(), 4380 diag::note_deleted_special_member_class_subobject) 4381 << CSM << MD->getParent() << /*IsField*/true 4382 << Field << DiagKind << IsDtorCallInCtor; 4383 } else { 4384 CXXBaseSpecifier *Base = Subobj.get<CXXBaseSpecifier*>(); 4385 S.Diag(Base->getLocStart(), 4386 diag::note_deleted_special_member_class_subobject) 4387 << CSM << MD->getParent() << /*IsField*/false 4388 << Base->getType() << DiagKind << IsDtorCallInCtor; 4389 } 4390 4391 if (DiagKind == 1) 4392 S.NoteDeletedFunction(Decl); 4393 // FIXME: Explain inaccessibility if DiagKind == 3. 4394 } 4395 4396 return true; 4397} 4398 4399/// Check whether we should delete a special member function due to having a 4400/// direct or virtual base class or non-static data member of class type M. 4401bool SpecialMemberDeletionInfo::shouldDeleteForClassSubobject( 4402 CXXRecordDecl *Class, Subobject Subobj, unsigned Quals) { 4403 FieldDecl *Field = Subobj.dyn_cast<FieldDecl*>(); 4404 4405 // C++11 [class.ctor]p5: 4406 // -- any direct or virtual base class, or non-static data member with no 4407 // brace-or-equal-initializer, has class type M (or array thereof) and 4408 // either M has no default constructor or overload resolution as applied 4409 // to M's default constructor results in an ambiguity or in a function 4410 // that is deleted or inaccessible 4411 // C++11 [class.copy]p11, C++11 [class.copy]p23: 4412 // -- a direct or virtual base class B that cannot be copied/moved because 4413 // overload resolution, as applied to B's corresponding special member, 4414 // results in an ambiguity or a function that is deleted or inaccessible 4415 // from the defaulted special member 4416 // C++11 [class.dtor]p5: 4417 // -- any direct or virtual base class [...] has a type with a destructor 4418 // that is deleted or inaccessible 4419 if (!(CSM == Sema::CXXDefaultConstructor && 4420 Field && Field->hasInClassInitializer()) && 4421 shouldDeleteForSubobjectCall(Subobj, lookupIn(Class, Quals), false)) 4422 return true; 4423 4424 // C++11 [class.ctor]p5, C++11 [class.copy]p11: 4425 // -- any direct or virtual base class or non-static data member has a 4426 // type with a destructor that is deleted or inaccessible 4427 if (IsConstructor) { 4428 Sema::SpecialMemberOverloadResult *SMOR = 4429 S.LookupSpecialMember(Class, Sema::CXXDestructor, 4430 false, false, false, false, false); 4431 if (shouldDeleteForSubobjectCall(Subobj, SMOR, true)) 4432 return true; 4433 } 4434 4435 return false; 4436} 4437 4438/// Check whether we should delete a special member function due to the class 4439/// having a particular direct or virtual base class. 4440bool SpecialMemberDeletionInfo::shouldDeleteForBase(CXXBaseSpecifier *Base) { 4441 CXXRecordDecl *BaseClass = Base->getType()->getAsCXXRecordDecl(); 4442 return shouldDeleteForClassSubobject(BaseClass, Base, 0); 4443} 4444 4445/// Check whether we should delete a special member function due to the class 4446/// having a particular non-static data member. 4447bool SpecialMemberDeletionInfo::shouldDeleteForField(FieldDecl *FD) { 4448 QualType FieldType = S.Context.getBaseElementType(FD->getType()); 4449 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4450 4451 if (CSM == Sema::CXXDefaultConstructor) { 4452 // For a default constructor, all references must be initialized in-class 4453 // and, if a union, it must have a non-const member. 4454 if (FieldType->isReferenceType() && !FD->hasInClassInitializer()) { 4455 if (Diagnose) 4456 S.Diag(FD->getLocation(), diag::note_deleted_default_ctor_uninit_field) 4457 << MD->getParent() << FD << FieldType << /*Reference*/0; 4458 return true; 4459 } 4460 // C++11 [class.ctor]p5: any non-variant non-static data member of 4461 // const-qualified type (or array thereof) with no 4462 // brace-or-equal-initializer does not have a user-provided default 4463 // constructor. 4464 if (!inUnion() && FieldType.isConstQualified() && 4465 !FD->hasInClassInitializer() && 4466 (!FieldRecord || !FieldRecord->hasUserProvidedDefaultConstructor())) { 4467 if (Diagnose) 4468 S.Diag(FD->getLocation(), diag::note_deleted_default_ctor_uninit_field) 4469 << MD->getParent() << FD << FD->getType() << /*Const*/1; 4470 return true; 4471 } 4472 4473 if (inUnion() && !FieldType.isConstQualified()) 4474 AllFieldsAreConst = false; 4475 } else if (CSM == Sema::CXXCopyConstructor) { 4476 // For a copy constructor, data members must not be of rvalue reference 4477 // type. 4478 if (FieldType->isRValueReferenceType()) { 4479 if (Diagnose) 4480 S.Diag(FD->getLocation(), diag::note_deleted_copy_ctor_rvalue_reference) 4481 << MD->getParent() << FD << FieldType; 4482 return true; 4483 } 4484 } else if (IsAssignment) { 4485 // For an assignment operator, data members must not be of reference type. 4486 if (FieldType->isReferenceType()) { 4487 if (Diagnose) 4488 S.Diag(FD->getLocation(), diag::note_deleted_assign_field) 4489 << IsMove << MD->getParent() << FD << FieldType << /*Reference*/0; 4490 return true; 4491 } 4492 if (!FieldRecord && FieldType.isConstQualified()) { 4493 // C++11 [class.copy]p23: 4494 // -- a non-static data member of const non-class type (or array thereof) 4495 if (Diagnose) 4496 S.Diag(FD->getLocation(), diag::note_deleted_assign_field) 4497 << IsMove << MD->getParent() << FD << FD->getType() << /*Const*/1; 4498 return true; 4499 } 4500 } 4501 4502 if (FieldRecord) { 4503 // Some additional restrictions exist on the variant members. 4504 if (!inUnion() && FieldRecord->isUnion() && 4505 FieldRecord->isAnonymousStructOrUnion()) { 4506 bool AllVariantFieldsAreConst = true; 4507 4508 // FIXME: Handle anonymous unions declared within anonymous unions. 4509 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4510 UE = FieldRecord->field_end(); 4511 UI != UE; ++UI) { 4512 QualType UnionFieldType = S.Context.getBaseElementType(UI->getType()); 4513 4514 if (!UnionFieldType.isConstQualified()) 4515 AllVariantFieldsAreConst = false; 4516 4517 CXXRecordDecl *UnionFieldRecord = UnionFieldType->getAsCXXRecordDecl(); 4518 if (UnionFieldRecord && 4519 shouldDeleteForClassSubobject(UnionFieldRecord, *UI, 4520 UnionFieldType.getCVRQualifiers())) 4521 return true; 4522 } 4523 4524 // At least one member in each anonymous union must be non-const 4525 if (CSM == Sema::CXXDefaultConstructor && AllVariantFieldsAreConst && 4526 FieldRecord->field_begin() != FieldRecord->field_end()) { 4527 if (Diagnose) 4528 S.Diag(FieldRecord->getLocation(), 4529 diag::note_deleted_default_ctor_all_const) 4530 << MD->getParent() << /*anonymous union*/1; 4531 return true; 4532 } 4533 4534 // Don't check the implicit member of the anonymous union type. 4535 // This is technically non-conformant, but sanity demands it. 4536 return false; 4537 } 4538 4539 if (shouldDeleteForClassSubobject(FieldRecord, FD, 4540 FieldType.getCVRQualifiers())) 4541 return true; 4542 } 4543 4544 return false; 4545} 4546 4547/// C++11 [class.ctor] p5: 4548/// A defaulted default constructor for a class X is defined as deleted if 4549/// X is a union and all of its variant members are of const-qualified type. 4550bool SpecialMemberDeletionInfo::shouldDeleteForAllConstMembers() { 4551 // This is a silly definition, because it gives an empty union a deleted 4552 // default constructor. Don't do that. 4553 if (CSM == Sema::CXXDefaultConstructor && inUnion() && AllFieldsAreConst && 4554 (MD->getParent()->field_begin() != MD->getParent()->field_end())) { 4555 if (Diagnose) 4556 S.Diag(MD->getParent()->getLocation(), 4557 diag::note_deleted_default_ctor_all_const) 4558 << MD->getParent() << /*not anonymous union*/0; 4559 return true; 4560 } 4561 return false; 4562} 4563 4564/// Determine whether a defaulted special member function should be defined as 4565/// deleted, as specified in C++11 [class.ctor]p5, C++11 [class.copy]p11, 4566/// C++11 [class.copy]p23, and C++11 [class.dtor]p5. 4567bool Sema::ShouldDeleteSpecialMember(CXXMethodDecl *MD, CXXSpecialMember CSM, 4568 bool Diagnose) { 4569 if (MD->isInvalidDecl()) 4570 return false; 4571 CXXRecordDecl *RD = MD->getParent(); 4572 assert(!RD->isDependentType() && "do deletion after instantiation"); 4573 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4574 return false; 4575 4576 // C++11 [expr.lambda.prim]p19: 4577 // The closure type associated with a lambda-expression has a 4578 // deleted (8.4.3) default constructor and a deleted copy 4579 // assignment operator. 4580 if (RD->isLambda() && 4581 (CSM == CXXDefaultConstructor || CSM == CXXCopyAssignment)) { 4582 if (Diagnose) 4583 Diag(RD->getLocation(), diag::note_lambda_decl); 4584 return true; 4585 } 4586 4587 // For an anonymous struct or union, the copy and assignment special members 4588 // will never be used, so skip the check. For an anonymous union declared at 4589 // namespace scope, the constructor and destructor are used. 4590 if (CSM != CXXDefaultConstructor && CSM != CXXDestructor && 4591 RD->isAnonymousStructOrUnion()) 4592 return false; 4593 4594 // C++11 [class.copy]p7, p18: 4595 // If the class definition declares a move constructor or move assignment 4596 // operator, an implicitly declared copy constructor or copy assignment 4597 // operator is defined as deleted. 4598 if (MD->isImplicit() && 4599 (CSM == CXXCopyConstructor || CSM == CXXCopyAssignment)) { 4600 CXXMethodDecl *UserDeclaredMove = 0; 4601 4602 // In Microsoft mode, a user-declared move only causes the deletion of the 4603 // corresponding copy operation, not both copy operations. 4604 if (RD->hasUserDeclaredMoveConstructor() && 4605 (!getLangOpts().MicrosoftMode || CSM == CXXCopyConstructor)) { 4606 if (!Diagnose) return true; 4607 UserDeclaredMove = RD->getMoveConstructor(); 4608 assert(UserDeclaredMove); 4609 } else if (RD->hasUserDeclaredMoveAssignment() && 4610 (!getLangOpts().MicrosoftMode || CSM == CXXCopyAssignment)) { 4611 if (!Diagnose) return true; 4612 UserDeclaredMove = RD->getMoveAssignmentOperator(); 4613 assert(UserDeclaredMove); 4614 } 4615 4616 if (UserDeclaredMove) { 4617 Diag(UserDeclaredMove->getLocation(), 4618 diag::note_deleted_copy_user_declared_move) 4619 << (CSM == CXXCopyAssignment) << RD 4620 << UserDeclaredMove->isMoveAssignmentOperator(); 4621 return true; 4622 } 4623 } 4624 4625 // Do access control from the special member function 4626 ContextRAII MethodContext(*this, MD); 4627 4628 // C++11 [class.dtor]p5: 4629 // -- for a virtual destructor, lookup of the non-array deallocation function 4630 // results in an ambiguity or in a function that is deleted or inaccessible 4631 if (CSM == CXXDestructor && MD->isVirtual()) { 4632 FunctionDecl *OperatorDelete = 0; 4633 DeclarationName Name = 4634 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 4635 if (FindDeallocationFunction(MD->getLocation(), MD->getParent(), Name, 4636 OperatorDelete, false)) { 4637 if (Diagnose) 4638 Diag(RD->getLocation(), diag::note_deleted_dtor_no_operator_delete); 4639 return true; 4640 } 4641 } 4642 4643 SpecialMemberDeletionInfo SMI(*this, MD, CSM, Diagnose); 4644 4645 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4646 BE = RD->bases_end(); BI != BE; ++BI) 4647 if (!BI->isVirtual() && 4648 SMI.shouldDeleteForBase(BI)) 4649 return true; 4650 4651 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 4652 BE = RD->vbases_end(); BI != BE; ++BI) 4653 if (SMI.shouldDeleteForBase(BI)) 4654 return true; 4655 4656 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4657 FE = RD->field_end(); FI != FE; ++FI) 4658 if (!FI->isInvalidDecl() && !FI->isUnnamedBitfield() && 4659 SMI.shouldDeleteForField(*FI)) 4660 return true; 4661 4662 if (SMI.shouldDeleteForAllConstMembers()) 4663 return true; 4664 4665 return false; 4666} 4667 4668/// \brief Data used with FindHiddenVirtualMethod 4669namespace { 4670 struct FindHiddenVirtualMethodData { 4671 Sema *S; 4672 CXXMethodDecl *Method; 4673 llvm::SmallPtrSet<const CXXMethodDecl *, 8> OverridenAndUsingBaseMethods; 4674 SmallVector<CXXMethodDecl *, 8> OverloadedMethods; 4675 }; 4676} 4677 4678/// \brief Member lookup function that determines whether a given C++ 4679/// method overloads virtual methods in a base class without overriding any, 4680/// to be used with CXXRecordDecl::lookupInBases(). 4681static bool FindHiddenVirtualMethod(const CXXBaseSpecifier *Specifier, 4682 CXXBasePath &Path, 4683 void *UserData) { 4684 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 4685 4686 FindHiddenVirtualMethodData &Data 4687 = *static_cast<FindHiddenVirtualMethodData*>(UserData); 4688 4689 DeclarationName Name = Data.Method->getDeclName(); 4690 assert(Name.getNameKind() == DeclarationName::Identifier); 4691 4692 bool foundSameNameMethod = false; 4693 SmallVector<CXXMethodDecl *, 8> overloadedMethods; 4694 for (Path.Decls = BaseRecord->lookup(Name); 4695 Path.Decls.first != Path.Decls.second; 4696 ++Path.Decls.first) { 4697 NamedDecl *D = *Path.Decls.first; 4698 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 4699 MD = MD->getCanonicalDecl(); 4700 foundSameNameMethod = true; 4701 // Interested only in hidden virtual methods. 4702 if (!MD->isVirtual()) 4703 continue; 4704 // If the method we are checking overrides a method from its base 4705 // don't warn about the other overloaded methods. 4706 if (!Data.S->IsOverload(Data.Method, MD, false)) 4707 return true; 4708 // Collect the overload only if its hidden. 4709 if (!Data.OverridenAndUsingBaseMethods.count(MD)) 4710 overloadedMethods.push_back(MD); 4711 } 4712 } 4713 4714 if (foundSameNameMethod) 4715 Data.OverloadedMethods.append(overloadedMethods.begin(), 4716 overloadedMethods.end()); 4717 return foundSameNameMethod; 4718} 4719 4720/// \brief See if a method overloads virtual methods in a base class without 4721/// overriding any. 4722void Sema::DiagnoseHiddenVirtualMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 4723 if (Diags.getDiagnosticLevel(diag::warn_overloaded_virtual, 4724 MD->getLocation()) == DiagnosticsEngine::Ignored) 4725 return; 4726 if (!MD->getDeclName().isIdentifier()) 4727 return; 4728 4729 CXXBasePaths Paths(/*FindAmbiguities=*/true, // true to look in all bases. 4730 /*bool RecordPaths=*/false, 4731 /*bool DetectVirtual=*/false); 4732 FindHiddenVirtualMethodData Data; 4733 Data.Method = MD; 4734 Data.S = this; 4735 4736 // Keep the base methods that were overriden or introduced in the subclass 4737 // by 'using' in a set. A base method not in this set is hidden. 4738 for (DeclContext::lookup_result res = DC->lookup(MD->getDeclName()); 4739 res.first != res.second; ++res.first) { 4740 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*res.first)) 4741 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 4742 E = MD->end_overridden_methods(); 4743 I != E; ++I) 4744 Data.OverridenAndUsingBaseMethods.insert((*I)->getCanonicalDecl()); 4745 if (UsingShadowDecl *shad = dyn_cast<UsingShadowDecl>(*res.first)) 4746 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(shad->getTargetDecl())) 4747 Data.OverridenAndUsingBaseMethods.insert(MD->getCanonicalDecl()); 4748 } 4749 4750 if (DC->lookupInBases(&FindHiddenVirtualMethod, &Data, Paths) && 4751 !Data.OverloadedMethods.empty()) { 4752 Diag(MD->getLocation(), diag::warn_overloaded_virtual) 4753 << MD << (Data.OverloadedMethods.size() > 1); 4754 4755 for (unsigned i = 0, e = Data.OverloadedMethods.size(); i != e; ++i) { 4756 CXXMethodDecl *overloadedMD = Data.OverloadedMethods[i]; 4757 Diag(overloadedMD->getLocation(), 4758 diag::note_hidden_overloaded_virtual_declared_here) << overloadedMD; 4759 } 4760 } 4761} 4762 4763void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 4764 Decl *TagDecl, 4765 SourceLocation LBrac, 4766 SourceLocation RBrac, 4767 AttributeList *AttrList) { 4768 if (!TagDecl) 4769 return; 4770 4771 AdjustDeclIfTemplate(TagDecl); 4772 4773 for (const AttributeList* l = AttrList; l; l = l->getNext()) { 4774 if (l->getKind() != AttributeList::AT_Visibility) 4775 continue; 4776 l->setInvalid(); 4777 Diag(l->getLoc(), diag::warn_attribute_after_definition_ignored) << 4778 l->getName(); 4779 } 4780 4781 ActOnFields(S, RLoc, TagDecl, llvm::makeArrayRef( 4782 // strict aliasing violation! 4783 reinterpret_cast<Decl**>(FieldCollector->getCurFields()), 4784 FieldCollector->getCurNumFields()), LBrac, RBrac, AttrList); 4785 4786 CheckCompletedCXXClass( 4787 dyn_cast_or_null<CXXRecordDecl>(TagDecl)); 4788} 4789 4790/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 4791/// special functions, such as the default constructor, copy 4792/// constructor, or destructor, to the given C++ class (C++ 4793/// [special]p1). This routine can only be executed just before the 4794/// definition of the class is complete. 4795void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 4796 if (!ClassDecl->hasUserDeclaredConstructor()) 4797 ++ASTContext::NumImplicitDefaultConstructors; 4798 4799 if (!ClassDecl->hasUserDeclaredCopyConstructor()) 4800 ++ASTContext::NumImplicitCopyConstructors; 4801 4802 if (getLangOpts().CPlusPlus0x && ClassDecl->needsImplicitMoveConstructor()) 4803 ++ASTContext::NumImplicitMoveConstructors; 4804 4805 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 4806 ++ASTContext::NumImplicitCopyAssignmentOperators; 4807 4808 // If we have a dynamic class, then the copy assignment operator may be 4809 // virtual, so we have to declare it immediately. This ensures that, e.g., 4810 // it shows up in the right place in the vtable and that we diagnose 4811 // problems with the implicit exception specification. 4812 if (ClassDecl->isDynamicClass()) 4813 DeclareImplicitCopyAssignment(ClassDecl); 4814 } 4815 4816 if (getLangOpts().CPlusPlus0x && ClassDecl->needsImplicitMoveAssignment()) { 4817 ++ASTContext::NumImplicitMoveAssignmentOperators; 4818 4819 // Likewise for the move assignment operator. 4820 if (ClassDecl->isDynamicClass()) 4821 DeclareImplicitMoveAssignment(ClassDecl); 4822 } 4823 4824 if (!ClassDecl->hasUserDeclaredDestructor()) { 4825 ++ASTContext::NumImplicitDestructors; 4826 4827 // If we have a dynamic class, then the destructor may be virtual, so we 4828 // have to declare the destructor immediately. This ensures that, e.g., it 4829 // shows up in the right place in the vtable and that we diagnose problems 4830 // with the implicit exception specification. 4831 if (ClassDecl->isDynamicClass()) 4832 DeclareImplicitDestructor(ClassDecl); 4833 } 4834} 4835 4836void Sema::ActOnReenterDeclaratorTemplateScope(Scope *S, DeclaratorDecl *D) { 4837 if (!D) 4838 return; 4839 4840 int NumParamList = D->getNumTemplateParameterLists(); 4841 for (int i = 0; i < NumParamList; i++) { 4842 TemplateParameterList* Params = D->getTemplateParameterList(i); 4843 for (TemplateParameterList::iterator Param = Params->begin(), 4844 ParamEnd = Params->end(); 4845 Param != ParamEnd; ++Param) { 4846 NamedDecl *Named = cast<NamedDecl>(*Param); 4847 if (Named->getDeclName()) { 4848 S->AddDecl(Named); 4849 IdResolver.AddDecl(Named); 4850 } 4851 } 4852 } 4853} 4854 4855void Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) { 4856 if (!D) 4857 return; 4858 4859 TemplateParameterList *Params = 0; 4860 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 4861 Params = Template->getTemplateParameters(); 4862 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 4863 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 4864 Params = PartialSpec->getTemplateParameters(); 4865 else 4866 return; 4867 4868 for (TemplateParameterList::iterator Param = Params->begin(), 4869 ParamEnd = Params->end(); 4870 Param != ParamEnd; ++Param) { 4871 NamedDecl *Named = cast<NamedDecl>(*Param); 4872 if (Named->getDeclName()) { 4873 S->AddDecl(Named); 4874 IdResolver.AddDecl(Named); 4875 } 4876 } 4877} 4878 4879void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 4880 if (!RecordD) return; 4881 AdjustDeclIfTemplate(RecordD); 4882 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD); 4883 PushDeclContext(S, Record); 4884} 4885 4886void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 4887 if (!RecordD) return; 4888 PopDeclContext(); 4889} 4890 4891/// ActOnStartDelayedCXXMethodDeclaration - We have completed 4892/// parsing a top-level (non-nested) C++ class, and we are now 4893/// parsing those parts of the given Method declaration that could 4894/// not be parsed earlier (C++ [class.mem]p2), such as default 4895/// arguments. This action should enter the scope of the given 4896/// Method declaration as if we had just parsed the qualified method 4897/// name. However, it should not bring the parameters into scope; 4898/// that will be performed by ActOnDelayedCXXMethodParameter. 4899void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 4900} 4901 4902/// ActOnDelayedCXXMethodParameter - We've already started a delayed 4903/// C++ method declaration. We're (re-)introducing the given 4904/// function parameter into scope for use in parsing later parts of 4905/// the method declaration. For example, we could see an 4906/// ActOnParamDefaultArgument event for this parameter. 4907void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) { 4908 if (!ParamD) 4909 return; 4910 4911 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD); 4912 4913 // If this parameter has an unparsed default argument, clear it out 4914 // to make way for the parsed default argument. 4915 if (Param->hasUnparsedDefaultArg()) 4916 Param->setDefaultArg(0); 4917 4918 S->AddDecl(Param); 4919 if (Param->getDeclName()) 4920 IdResolver.AddDecl(Param); 4921} 4922 4923/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 4924/// processing the delayed method declaration for Method. The method 4925/// declaration is now considered finished. There may be a separate 4926/// ActOnStartOfFunctionDef action later (not necessarily 4927/// immediately!) for this method, if it was also defined inside the 4928/// class body. 4929void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 4930 if (!MethodD) 4931 return; 4932 4933 AdjustDeclIfTemplate(MethodD); 4934 4935 FunctionDecl *Method = cast<FunctionDecl>(MethodD); 4936 4937 // Now that we have our default arguments, check the constructor 4938 // again. It could produce additional diagnostics or affect whether 4939 // the class has implicitly-declared destructors, among other 4940 // things. 4941 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 4942 CheckConstructor(Constructor); 4943 4944 // Check the default arguments, which we may have added. 4945 if (!Method->isInvalidDecl()) 4946 CheckCXXDefaultArguments(Method); 4947} 4948 4949/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 4950/// the well-formedness of the constructor declarator @p D with type @p 4951/// R. If there are any errors in the declarator, this routine will 4952/// emit diagnostics and set the invalid bit to true. In any case, the type 4953/// will be updated to reflect a well-formed type for the constructor and 4954/// returned. 4955QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 4956 StorageClass &SC) { 4957 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 4958 4959 // C++ [class.ctor]p3: 4960 // A constructor shall not be virtual (10.3) or static (9.4). A 4961 // constructor can be invoked for a const, volatile or const 4962 // volatile object. A constructor shall not be declared const, 4963 // volatile, or const volatile (9.3.2). 4964 if (isVirtual) { 4965 if (!D.isInvalidType()) 4966 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 4967 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 4968 << SourceRange(D.getIdentifierLoc()); 4969 D.setInvalidType(); 4970 } 4971 if (SC == SC_Static) { 4972 if (!D.isInvalidType()) 4973 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 4974 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 4975 << SourceRange(D.getIdentifierLoc()); 4976 D.setInvalidType(); 4977 SC = SC_None; 4978 } 4979 4980 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 4981 if (FTI.TypeQuals != 0) { 4982 if (FTI.TypeQuals & Qualifiers::Const) 4983 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 4984 << "const" << SourceRange(D.getIdentifierLoc()); 4985 if (FTI.TypeQuals & Qualifiers::Volatile) 4986 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 4987 << "volatile" << SourceRange(D.getIdentifierLoc()); 4988 if (FTI.TypeQuals & Qualifiers::Restrict) 4989 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 4990 << "restrict" << SourceRange(D.getIdentifierLoc()); 4991 D.setInvalidType(); 4992 } 4993 4994 // C++0x [class.ctor]p4: 4995 // A constructor shall not be declared with a ref-qualifier. 4996 if (FTI.hasRefQualifier()) { 4997 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_constructor) 4998 << FTI.RefQualifierIsLValueRef 4999 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 5000 D.setInvalidType(); 5001 } 5002 5003 // Rebuild the function type "R" without any type qualifiers (in 5004 // case any of the errors above fired) and with "void" as the 5005 // return type, since constructors don't have return types. 5006 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5007 if (Proto->getResultType() == Context.VoidTy && !D.isInvalidType()) 5008 return R; 5009 5010 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 5011 EPI.TypeQuals = 0; 5012 EPI.RefQualifier = RQ_None; 5013 5014 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 5015 Proto->getNumArgs(), EPI); 5016} 5017 5018/// CheckConstructor - Checks a fully-formed constructor for 5019/// well-formedness, issuing any diagnostics required. Returns true if 5020/// the constructor declarator is invalid. 5021void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 5022 CXXRecordDecl *ClassDecl 5023 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 5024 if (!ClassDecl) 5025 return Constructor->setInvalidDecl(); 5026 5027 // C++ [class.copy]p3: 5028 // A declaration of a constructor for a class X is ill-formed if 5029 // its first parameter is of type (optionally cv-qualified) X and 5030 // either there are no other parameters or else all other 5031 // parameters have default arguments. 5032 if (!Constructor->isInvalidDecl() && 5033 ((Constructor->getNumParams() == 1) || 5034 (Constructor->getNumParams() > 1 && 5035 Constructor->getParamDecl(1)->hasDefaultArg())) && 5036 Constructor->getTemplateSpecializationKind() 5037 != TSK_ImplicitInstantiation) { 5038 QualType ParamType = Constructor->getParamDecl(0)->getType(); 5039 QualType ClassTy = Context.getTagDeclType(ClassDecl); 5040 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 5041 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 5042 const char *ConstRef 5043 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 5044 : " const &"; 5045 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 5046 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 5047 5048 // FIXME: Rather that making the constructor invalid, we should endeavor 5049 // to fix the type. 5050 Constructor->setInvalidDecl(); 5051 } 5052 } 5053} 5054 5055/// CheckDestructor - Checks a fully-formed destructor definition for 5056/// well-formedness, issuing any diagnostics required. Returns true 5057/// on error. 5058bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 5059 CXXRecordDecl *RD = Destructor->getParent(); 5060 5061 if (Destructor->isVirtual()) { 5062 SourceLocation Loc; 5063 5064 if (!Destructor->isImplicit()) 5065 Loc = Destructor->getLocation(); 5066 else 5067 Loc = RD->getLocation(); 5068 5069 // If we have a virtual destructor, look up the deallocation function 5070 FunctionDecl *OperatorDelete = 0; 5071 DeclarationName Name = 5072 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 5073 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 5074 return true; 5075 5076 MarkFunctionReferenced(Loc, OperatorDelete); 5077 5078 Destructor->setOperatorDelete(OperatorDelete); 5079 } 5080 5081 return false; 5082} 5083 5084static inline bool 5085FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 5086 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 5087 FTI.ArgInfo[0].Param && 5088 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()); 5089} 5090 5091/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 5092/// the well-formednes of the destructor declarator @p D with type @p 5093/// R. If there are any errors in the declarator, this routine will 5094/// emit diagnostics and set the declarator to invalid. Even if this happens, 5095/// will be updated to reflect a well-formed type for the destructor and 5096/// returned. 5097QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, 5098 StorageClass& SC) { 5099 // C++ [class.dtor]p1: 5100 // [...] A typedef-name that names a class is a class-name 5101 // (7.1.3); however, a typedef-name that names a class shall not 5102 // be used as the identifier in the declarator for a destructor 5103 // declaration. 5104 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 5105 if (const TypedefType *TT = DeclaratorType->getAs<TypedefType>()) 5106 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 5107 << DeclaratorType << isa<TypeAliasDecl>(TT->getDecl()); 5108 else if (const TemplateSpecializationType *TST = 5109 DeclaratorType->getAs<TemplateSpecializationType>()) 5110 if (TST->isTypeAlias()) 5111 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 5112 << DeclaratorType << 1; 5113 5114 // C++ [class.dtor]p2: 5115 // A destructor is used to destroy objects of its class type. A 5116 // destructor takes no parameters, and no return type can be 5117 // specified for it (not even void). The address of a destructor 5118 // shall not be taken. A destructor shall not be static. A 5119 // destructor can be invoked for a const, volatile or const 5120 // volatile object. A destructor shall not be declared const, 5121 // volatile or const volatile (9.3.2). 5122 if (SC == SC_Static) { 5123 if (!D.isInvalidType()) 5124 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 5125 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5126 << SourceRange(D.getIdentifierLoc()) 5127 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 5128 5129 SC = SC_None; 5130 } 5131 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 5132 // Destructors don't have return types, but the parser will 5133 // happily parse something like: 5134 // 5135 // class X { 5136 // float ~X(); 5137 // }; 5138 // 5139 // The return type will be eliminated later. 5140 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 5141 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 5142 << SourceRange(D.getIdentifierLoc()); 5143 } 5144 5145 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5146 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 5147 if (FTI.TypeQuals & Qualifiers::Const) 5148 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5149 << "const" << SourceRange(D.getIdentifierLoc()); 5150 if (FTI.TypeQuals & Qualifiers::Volatile) 5151 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5152 << "volatile" << SourceRange(D.getIdentifierLoc()); 5153 if (FTI.TypeQuals & Qualifiers::Restrict) 5154 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5155 << "restrict" << SourceRange(D.getIdentifierLoc()); 5156 D.setInvalidType(); 5157 } 5158 5159 // C++0x [class.dtor]p2: 5160 // A destructor shall not be declared with a ref-qualifier. 5161 if (FTI.hasRefQualifier()) { 5162 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_destructor) 5163 << FTI.RefQualifierIsLValueRef 5164 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 5165 D.setInvalidType(); 5166 } 5167 5168 // Make sure we don't have any parameters. 5169 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 5170 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 5171 5172 // Delete the parameters. 5173 FTI.freeArgs(); 5174 D.setInvalidType(); 5175 } 5176 5177 // Make sure the destructor isn't variadic. 5178 if (FTI.isVariadic) { 5179 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 5180 D.setInvalidType(); 5181 } 5182 5183 // Rebuild the function type "R" without any type qualifiers or 5184 // parameters (in case any of the errors above fired) and with 5185 // "void" as the return type, since destructors don't have return 5186 // types. 5187 if (!D.isInvalidType()) 5188 return R; 5189 5190 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5191 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 5192 EPI.Variadic = false; 5193 EPI.TypeQuals = 0; 5194 EPI.RefQualifier = RQ_None; 5195 return Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 5196} 5197 5198/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 5199/// well-formednes of the conversion function declarator @p D with 5200/// type @p R. If there are any errors in the declarator, this routine 5201/// will emit diagnostics and return true. Otherwise, it will return 5202/// false. Either way, the type @p R will be updated to reflect a 5203/// well-formed type for the conversion operator. 5204void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 5205 StorageClass& SC) { 5206 // C++ [class.conv.fct]p1: 5207 // Neither parameter types nor return type can be specified. The 5208 // type of a conversion function (8.3.5) is "function taking no 5209 // parameter returning conversion-type-id." 5210 if (SC == SC_Static) { 5211 if (!D.isInvalidType()) 5212 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 5213 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5214 << SourceRange(D.getIdentifierLoc()); 5215 D.setInvalidType(); 5216 SC = SC_None; 5217 } 5218 5219 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 5220 5221 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 5222 // Conversion functions don't have return types, but the parser will 5223 // happily parse something like: 5224 // 5225 // class X { 5226 // float operator bool(); 5227 // }; 5228 // 5229 // The return type will be changed later anyway. 5230 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 5231 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 5232 << SourceRange(D.getIdentifierLoc()); 5233 D.setInvalidType(); 5234 } 5235 5236 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5237 5238 // Make sure we don't have any parameters. 5239 if (Proto->getNumArgs() > 0) { 5240 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 5241 5242 // Delete the parameters. 5243 D.getFunctionTypeInfo().freeArgs(); 5244 D.setInvalidType(); 5245 } else if (Proto->isVariadic()) { 5246 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 5247 D.setInvalidType(); 5248 } 5249 5250 // Diagnose "&operator bool()" and other such nonsense. This 5251 // is actually a gcc extension which we don't support. 5252 if (Proto->getResultType() != ConvType) { 5253 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 5254 << Proto->getResultType(); 5255 D.setInvalidType(); 5256 ConvType = Proto->getResultType(); 5257 } 5258 5259 // C++ [class.conv.fct]p4: 5260 // The conversion-type-id shall not represent a function type nor 5261 // an array type. 5262 if (ConvType->isArrayType()) { 5263 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 5264 ConvType = Context.getPointerType(ConvType); 5265 D.setInvalidType(); 5266 } else if (ConvType->isFunctionType()) { 5267 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 5268 ConvType = Context.getPointerType(ConvType); 5269 D.setInvalidType(); 5270 } 5271 5272 // Rebuild the function type "R" without any parameters (in case any 5273 // of the errors above fired) and with the conversion type as the 5274 // return type. 5275 if (D.isInvalidType()) 5276 R = Context.getFunctionType(ConvType, 0, 0, Proto->getExtProtoInfo()); 5277 5278 // C++0x explicit conversion operators. 5279 if (D.getDeclSpec().isExplicitSpecified()) 5280 Diag(D.getDeclSpec().getExplicitSpecLoc(), 5281 getLangOpts().CPlusPlus0x ? 5282 diag::warn_cxx98_compat_explicit_conversion_functions : 5283 diag::ext_explicit_conversion_functions) 5284 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 5285} 5286 5287/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 5288/// the declaration of the given C++ conversion function. This routine 5289/// is responsible for recording the conversion function in the C++ 5290/// class, if possible. 5291Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 5292 assert(Conversion && "Expected to receive a conversion function declaration"); 5293 5294 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 5295 5296 // Make sure we aren't redeclaring the conversion function. 5297 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 5298 5299 // C++ [class.conv.fct]p1: 5300 // [...] A conversion function is never used to convert a 5301 // (possibly cv-qualified) object to the (possibly cv-qualified) 5302 // same object type (or a reference to it), to a (possibly 5303 // cv-qualified) base class of that type (or a reference to it), 5304 // or to (possibly cv-qualified) void. 5305 // FIXME: Suppress this warning if the conversion function ends up being a 5306 // virtual function that overrides a virtual function in a base class. 5307 QualType ClassType 5308 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 5309 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 5310 ConvType = ConvTypeRef->getPointeeType(); 5311 if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared && 5312 Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) 5313 /* Suppress diagnostics for instantiations. */; 5314 else if (ConvType->isRecordType()) { 5315 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 5316 if (ConvType == ClassType) 5317 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 5318 << ClassType; 5319 else if (IsDerivedFrom(ClassType, ConvType)) 5320 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 5321 << ClassType << ConvType; 5322 } else if (ConvType->isVoidType()) { 5323 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 5324 << ClassType << ConvType; 5325 } 5326 5327 if (FunctionTemplateDecl *ConversionTemplate 5328 = Conversion->getDescribedFunctionTemplate()) 5329 return ConversionTemplate; 5330 5331 return Conversion; 5332} 5333 5334//===----------------------------------------------------------------------===// 5335// Namespace Handling 5336//===----------------------------------------------------------------------===// 5337 5338 5339 5340/// ActOnStartNamespaceDef - This is called at the start of a namespace 5341/// definition. 5342Decl *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 5343 SourceLocation InlineLoc, 5344 SourceLocation NamespaceLoc, 5345 SourceLocation IdentLoc, 5346 IdentifierInfo *II, 5347 SourceLocation LBrace, 5348 AttributeList *AttrList) { 5349 SourceLocation StartLoc = InlineLoc.isValid() ? InlineLoc : NamespaceLoc; 5350 // For anonymous namespace, take the location of the left brace. 5351 SourceLocation Loc = II ? IdentLoc : LBrace; 5352 bool IsInline = InlineLoc.isValid(); 5353 bool IsInvalid = false; 5354 bool IsStd = false; 5355 bool AddToKnown = false; 5356 Scope *DeclRegionScope = NamespcScope->getParent(); 5357 5358 NamespaceDecl *PrevNS = 0; 5359 if (II) { 5360 // C++ [namespace.def]p2: 5361 // The identifier in an original-namespace-definition shall not 5362 // have been previously defined in the declarative region in 5363 // which the original-namespace-definition appears. The 5364 // identifier in an original-namespace-definition is the name of 5365 // the namespace. Subsequently in that declarative region, it is 5366 // treated as an original-namespace-name. 5367 // 5368 // Since namespace names are unique in their scope, and we don't 5369 // look through using directives, just look for any ordinary names. 5370 5371 const unsigned IDNS = Decl::IDNS_Ordinary | Decl::IDNS_Member | 5372 Decl::IDNS_Type | Decl::IDNS_Using | Decl::IDNS_Tag | 5373 Decl::IDNS_Namespace; 5374 NamedDecl *PrevDecl = 0; 5375 for (DeclContext::lookup_result R 5376 = CurContext->getRedeclContext()->lookup(II); 5377 R.first != R.second; ++R.first) { 5378 if ((*R.first)->getIdentifierNamespace() & IDNS) { 5379 PrevDecl = *R.first; 5380 break; 5381 } 5382 } 5383 5384 PrevNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl); 5385 5386 if (PrevNS) { 5387 // This is an extended namespace definition. 5388 if (IsInline != PrevNS->isInline()) { 5389 // inline-ness must match 5390 if (PrevNS->isInline()) { 5391 // The user probably just forgot the 'inline', so suggest that it 5392 // be added back. 5393 Diag(Loc, diag::warn_inline_namespace_reopened_noninline) 5394 << FixItHint::CreateInsertion(NamespaceLoc, "inline "); 5395 } else { 5396 Diag(Loc, diag::err_inline_namespace_mismatch) 5397 << IsInline; 5398 } 5399 Diag(PrevNS->getLocation(), diag::note_previous_definition); 5400 5401 IsInline = PrevNS->isInline(); 5402 } 5403 } else if (PrevDecl) { 5404 // This is an invalid name redefinition. 5405 Diag(Loc, diag::err_redefinition_different_kind) 5406 << II; 5407 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 5408 IsInvalid = true; 5409 // Continue on to push Namespc as current DeclContext and return it. 5410 } else if (II->isStr("std") && 5411 CurContext->getRedeclContext()->isTranslationUnit()) { 5412 // This is the first "real" definition of the namespace "std", so update 5413 // our cache of the "std" namespace to point at this definition. 5414 PrevNS = getStdNamespace(); 5415 IsStd = true; 5416 AddToKnown = !IsInline; 5417 } else { 5418 // We've seen this namespace for the first time. 5419 AddToKnown = !IsInline; 5420 } 5421 } else { 5422 // Anonymous namespaces. 5423 5424 // Determine whether the parent already has an anonymous namespace. 5425 DeclContext *Parent = CurContext->getRedeclContext(); 5426 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 5427 PrevNS = TU->getAnonymousNamespace(); 5428 } else { 5429 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 5430 PrevNS = ND->getAnonymousNamespace(); 5431 } 5432 5433 if (PrevNS && IsInline != PrevNS->isInline()) { 5434 // inline-ness must match 5435 Diag(Loc, diag::err_inline_namespace_mismatch) 5436 << IsInline; 5437 Diag(PrevNS->getLocation(), diag::note_previous_definition); 5438 5439 // Recover by ignoring the new namespace's inline status. 5440 IsInline = PrevNS->isInline(); 5441 } 5442 } 5443 5444 NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, IsInline, 5445 StartLoc, Loc, II, PrevNS); 5446 if (IsInvalid) 5447 Namespc->setInvalidDecl(); 5448 5449 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 5450 5451 // FIXME: Should we be merging attributes? 5452 if (const VisibilityAttr *Attr = Namespc->getAttr<VisibilityAttr>()) 5453 PushNamespaceVisibilityAttr(Attr, Loc); 5454 5455 if (IsStd) 5456 StdNamespace = Namespc; 5457 if (AddToKnown) 5458 KnownNamespaces[Namespc] = false; 5459 5460 if (II) { 5461 PushOnScopeChains(Namespc, DeclRegionScope); 5462 } else { 5463 // Link the anonymous namespace into its parent. 5464 DeclContext *Parent = CurContext->getRedeclContext(); 5465 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 5466 TU->setAnonymousNamespace(Namespc); 5467 } else { 5468 cast<NamespaceDecl>(Parent)->setAnonymousNamespace(Namespc); 5469 } 5470 5471 CurContext->addDecl(Namespc); 5472 5473 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 5474 // behaves as if it were replaced by 5475 // namespace unique { /* empty body */ } 5476 // using namespace unique; 5477 // namespace unique { namespace-body } 5478 // where all occurrences of 'unique' in a translation unit are 5479 // replaced by the same identifier and this identifier differs 5480 // from all other identifiers in the entire program. 5481 5482 // We just create the namespace with an empty name and then add an 5483 // implicit using declaration, just like the standard suggests. 5484 // 5485 // CodeGen enforces the "universally unique" aspect by giving all 5486 // declarations semantically contained within an anonymous 5487 // namespace internal linkage. 5488 5489 if (!PrevNS) { 5490 UsingDirectiveDecl* UD 5491 = UsingDirectiveDecl::Create(Context, CurContext, 5492 /* 'using' */ LBrace, 5493 /* 'namespace' */ SourceLocation(), 5494 /* qualifier */ NestedNameSpecifierLoc(), 5495 /* identifier */ SourceLocation(), 5496 Namespc, 5497 /* Ancestor */ CurContext); 5498 UD->setImplicit(); 5499 CurContext->addDecl(UD); 5500 } 5501 } 5502 5503 ActOnDocumentableDecl(Namespc); 5504 5505 // Although we could have an invalid decl (i.e. the namespace name is a 5506 // redefinition), push it as current DeclContext and try to continue parsing. 5507 // FIXME: We should be able to push Namespc here, so that the each DeclContext 5508 // for the namespace has the declarations that showed up in that particular 5509 // namespace definition. 5510 PushDeclContext(NamespcScope, Namespc); 5511 return Namespc; 5512} 5513 5514/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 5515/// is a namespace alias, returns the namespace it points to. 5516static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 5517 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 5518 return AD->getNamespace(); 5519 return dyn_cast_or_null<NamespaceDecl>(D); 5520} 5521 5522/// ActOnFinishNamespaceDef - This callback is called after a namespace is 5523/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 5524void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) { 5525 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 5526 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 5527 Namespc->setRBraceLoc(RBrace); 5528 PopDeclContext(); 5529 if (Namespc->hasAttr<VisibilityAttr>()) 5530 PopPragmaVisibility(true, RBrace); 5531} 5532 5533CXXRecordDecl *Sema::getStdBadAlloc() const { 5534 return cast_or_null<CXXRecordDecl>( 5535 StdBadAlloc.get(Context.getExternalSource())); 5536} 5537 5538NamespaceDecl *Sema::getStdNamespace() const { 5539 return cast_or_null<NamespaceDecl>( 5540 StdNamespace.get(Context.getExternalSource())); 5541} 5542 5543/// \brief Retrieve the special "std" namespace, which may require us to 5544/// implicitly define the namespace. 5545NamespaceDecl *Sema::getOrCreateStdNamespace() { 5546 if (!StdNamespace) { 5547 // The "std" namespace has not yet been defined, so build one implicitly. 5548 StdNamespace = NamespaceDecl::Create(Context, 5549 Context.getTranslationUnitDecl(), 5550 /*Inline=*/false, 5551 SourceLocation(), SourceLocation(), 5552 &PP.getIdentifierTable().get("std"), 5553 /*PrevDecl=*/0); 5554 getStdNamespace()->setImplicit(true); 5555 } 5556 5557 return getStdNamespace(); 5558} 5559 5560bool Sema::isStdInitializerList(QualType Ty, QualType *Element) { 5561 assert(getLangOpts().CPlusPlus && 5562 "Looking for std::initializer_list outside of C++."); 5563 5564 // We're looking for implicit instantiations of 5565 // template <typename E> class std::initializer_list. 5566 5567 if (!StdNamespace) // If we haven't seen namespace std yet, this can't be it. 5568 return false; 5569 5570 ClassTemplateDecl *Template = 0; 5571 const TemplateArgument *Arguments = 0; 5572 5573 if (const RecordType *RT = Ty->getAs<RecordType>()) { 5574 5575 ClassTemplateSpecializationDecl *Specialization = 5576 dyn_cast<ClassTemplateSpecializationDecl>(RT->getDecl()); 5577 if (!Specialization) 5578 return false; 5579 5580 Template = Specialization->getSpecializedTemplate(); 5581 Arguments = Specialization->getTemplateArgs().data(); 5582 } else if (const TemplateSpecializationType *TST = 5583 Ty->getAs<TemplateSpecializationType>()) { 5584 Template = dyn_cast_or_null<ClassTemplateDecl>( 5585 TST->getTemplateName().getAsTemplateDecl()); 5586 Arguments = TST->getArgs(); 5587 } 5588 if (!Template) 5589 return false; 5590 5591 if (!StdInitializerList) { 5592 // Haven't recognized std::initializer_list yet, maybe this is it. 5593 CXXRecordDecl *TemplateClass = Template->getTemplatedDecl(); 5594 if (TemplateClass->getIdentifier() != 5595 &PP.getIdentifierTable().get("initializer_list") || 5596 !getStdNamespace()->InEnclosingNamespaceSetOf( 5597 TemplateClass->getDeclContext())) 5598 return false; 5599 // This is a template called std::initializer_list, but is it the right 5600 // template? 5601 TemplateParameterList *Params = Template->getTemplateParameters(); 5602 if (Params->getMinRequiredArguments() != 1) 5603 return false; 5604 if (!isa<TemplateTypeParmDecl>(Params->getParam(0))) 5605 return false; 5606 5607 // It's the right template. 5608 StdInitializerList = Template; 5609 } 5610 5611 if (Template != StdInitializerList) 5612 return false; 5613 5614 // This is an instance of std::initializer_list. Find the argument type. 5615 if (Element) 5616 *Element = Arguments[0].getAsType(); 5617 return true; 5618} 5619 5620static ClassTemplateDecl *LookupStdInitializerList(Sema &S, SourceLocation Loc){ 5621 NamespaceDecl *Std = S.getStdNamespace(); 5622 if (!Std) { 5623 S.Diag(Loc, diag::err_implied_std_initializer_list_not_found); 5624 return 0; 5625 } 5626 5627 LookupResult Result(S, &S.PP.getIdentifierTable().get("initializer_list"), 5628 Loc, Sema::LookupOrdinaryName); 5629 if (!S.LookupQualifiedName(Result, Std)) { 5630 S.Diag(Loc, diag::err_implied_std_initializer_list_not_found); 5631 return 0; 5632 } 5633 ClassTemplateDecl *Template = Result.getAsSingle<ClassTemplateDecl>(); 5634 if (!Template) { 5635 Result.suppressDiagnostics(); 5636 // We found something weird. Complain about the first thing we found. 5637 NamedDecl *Found = *Result.begin(); 5638 S.Diag(Found->getLocation(), diag::err_malformed_std_initializer_list); 5639 return 0; 5640 } 5641 5642 // We found some template called std::initializer_list. Now verify that it's 5643 // correct. 5644 TemplateParameterList *Params = Template->getTemplateParameters(); 5645 if (Params->getMinRequiredArguments() != 1 || 5646 !isa<TemplateTypeParmDecl>(Params->getParam(0))) { 5647 S.Diag(Template->getLocation(), diag::err_malformed_std_initializer_list); 5648 return 0; 5649 } 5650 5651 return Template; 5652} 5653 5654QualType Sema::BuildStdInitializerList(QualType Element, SourceLocation Loc) { 5655 if (!StdInitializerList) { 5656 StdInitializerList = LookupStdInitializerList(*this, Loc); 5657 if (!StdInitializerList) 5658 return QualType(); 5659 } 5660 5661 TemplateArgumentListInfo Args(Loc, Loc); 5662 Args.addArgument(TemplateArgumentLoc(TemplateArgument(Element), 5663 Context.getTrivialTypeSourceInfo(Element, 5664 Loc))); 5665 return Context.getCanonicalType( 5666 CheckTemplateIdType(TemplateName(StdInitializerList), Loc, Args)); 5667} 5668 5669bool Sema::isInitListConstructor(const CXXConstructorDecl* Ctor) { 5670 // C++ [dcl.init.list]p2: 5671 // A constructor is an initializer-list constructor if its first parameter 5672 // is of type std::initializer_list<E> or reference to possibly cv-qualified 5673 // std::initializer_list<E> for some type E, and either there are no other 5674 // parameters or else all other parameters have default arguments. 5675 if (Ctor->getNumParams() < 1 || 5676 (Ctor->getNumParams() > 1 && !Ctor->getParamDecl(1)->hasDefaultArg())) 5677 return false; 5678 5679 QualType ArgType = Ctor->getParamDecl(0)->getType(); 5680 if (const ReferenceType *RT = ArgType->getAs<ReferenceType>()) 5681 ArgType = RT->getPointeeType().getUnqualifiedType(); 5682 5683 return isStdInitializerList(ArgType, 0); 5684} 5685 5686/// \brief Determine whether a using statement is in a context where it will be 5687/// apply in all contexts. 5688static bool IsUsingDirectiveInToplevelContext(DeclContext *CurContext) { 5689 switch (CurContext->getDeclKind()) { 5690 case Decl::TranslationUnit: 5691 return true; 5692 case Decl::LinkageSpec: 5693 return IsUsingDirectiveInToplevelContext(CurContext->getParent()); 5694 default: 5695 return false; 5696 } 5697} 5698 5699namespace { 5700 5701// Callback to only accept typo corrections that are namespaces. 5702class NamespaceValidatorCCC : public CorrectionCandidateCallback { 5703 public: 5704 virtual bool ValidateCandidate(const TypoCorrection &candidate) { 5705 if (NamedDecl *ND = candidate.getCorrectionDecl()) { 5706 return isa<NamespaceDecl>(ND) || isa<NamespaceAliasDecl>(ND); 5707 } 5708 return false; 5709 } 5710}; 5711 5712} 5713 5714static bool TryNamespaceTypoCorrection(Sema &S, LookupResult &R, Scope *Sc, 5715 CXXScopeSpec &SS, 5716 SourceLocation IdentLoc, 5717 IdentifierInfo *Ident) { 5718 NamespaceValidatorCCC Validator; 5719 R.clear(); 5720 if (TypoCorrection Corrected = S.CorrectTypo(R.getLookupNameInfo(), 5721 R.getLookupKind(), Sc, &SS, 5722 Validator)) { 5723 std::string CorrectedStr(Corrected.getAsString(S.getLangOpts())); 5724 std::string CorrectedQuotedStr(Corrected.getQuoted(S.getLangOpts())); 5725 if (DeclContext *DC = S.computeDeclContext(SS, false)) 5726 S.Diag(IdentLoc, diag::err_using_directive_member_suggest) 5727 << Ident << DC << CorrectedQuotedStr << SS.getRange() 5728 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr); 5729 else 5730 S.Diag(IdentLoc, diag::err_using_directive_suggest) 5731 << Ident << CorrectedQuotedStr 5732 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr); 5733 5734 S.Diag(Corrected.getCorrectionDecl()->getLocation(), 5735 diag::note_namespace_defined_here) << CorrectedQuotedStr; 5736 5737 R.addDecl(Corrected.getCorrectionDecl()); 5738 return true; 5739 } 5740 return false; 5741} 5742 5743Decl *Sema::ActOnUsingDirective(Scope *S, 5744 SourceLocation UsingLoc, 5745 SourceLocation NamespcLoc, 5746 CXXScopeSpec &SS, 5747 SourceLocation IdentLoc, 5748 IdentifierInfo *NamespcName, 5749 AttributeList *AttrList) { 5750 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 5751 assert(NamespcName && "Invalid NamespcName."); 5752 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 5753 5754 // This can only happen along a recovery path. 5755 while (S->getFlags() & Scope::TemplateParamScope) 5756 S = S->getParent(); 5757 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 5758 5759 UsingDirectiveDecl *UDir = 0; 5760 NestedNameSpecifier *Qualifier = 0; 5761 if (SS.isSet()) 5762 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 5763 5764 // Lookup namespace name. 5765 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 5766 LookupParsedName(R, S, &SS); 5767 if (R.isAmbiguous()) 5768 return 0; 5769 5770 if (R.empty()) { 5771 R.clear(); 5772 // Allow "using namespace std;" or "using namespace ::std;" even if 5773 // "std" hasn't been defined yet, for GCC compatibility. 5774 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 5775 NamespcName->isStr("std")) { 5776 Diag(IdentLoc, diag::ext_using_undefined_std); 5777 R.addDecl(getOrCreateStdNamespace()); 5778 R.resolveKind(); 5779 } 5780 // Otherwise, attempt typo correction. 5781 else TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, NamespcName); 5782 } 5783 5784 if (!R.empty()) { 5785 NamedDecl *Named = R.getFoundDecl(); 5786 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 5787 && "expected namespace decl"); 5788 // C++ [namespace.udir]p1: 5789 // A using-directive specifies that the names in the nominated 5790 // namespace can be used in the scope in which the 5791 // using-directive appears after the using-directive. During 5792 // unqualified name lookup (3.4.1), the names appear as if they 5793 // were declared in the nearest enclosing namespace which 5794 // contains both the using-directive and the nominated 5795 // namespace. [Note: in this context, "contains" means "contains 5796 // directly or indirectly". ] 5797 5798 // Find enclosing context containing both using-directive and 5799 // nominated namespace. 5800 NamespaceDecl *NS = getNamespaceDecl(Named); 5801 DeclContext *CommonAncestor = cast<DeclContext>(NS); 5802 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 5803 CommonAncestor = CommonAncestor->getParent(); 5804 5805 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 5806 SS.getWithLocInContext(Context), 5807 IdentLoc, Named, CommonAncestor); 5808 5809 if (IsUsingDirectiveInToplevelContext(CurContext) && 5810 !SourceMgr.isFromMainFile(SourceMgr.getExpansionLoc(IdentLoc))) { 5811 Diag(IdentLoc, diag::warn_using_directive_in_header); 5812 } 5813 5814 PushUsingDirective(S, UDir); 5815 } else { 5816 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 5817 } 5818 5819 // FIXME: We ignore attributes for now. 5820 return UDir; 5821} 5822 5823void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 5824 // If the scope has an associated entity and the using directive is at 5825 // namespace or translation unit scope, add the UsingDirectiveDecl into 5826 // its lookup structure so qualified name lookup can find it. 5827 DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity()); 5828 if (Ctx && !Ctx->isFunctionOrMethod()) 5829 Ctx->addDecl(UDir); 5830 else 5831 // Otherwise, it is at block sope. The using-directives will affect lookup 5832 // only to the end of the scope. 5833 S->PushUsingDirective(UDir); 5834} 5835 5836 5837Decl *Sema::ActOnUsingDeclaration(Scope *S, 5838 AccessSpecifier AS, 5839 bool HasUsingKeyword, 5840 SourceLocation UsingLoc, 5841 CXXScopeSpec &SS, 5842 UnqualifiedId &Name, 5843 AttributeList *AttrList, 5844 bool IsTypeName, 5845 SourceLocation TypenameLoc) { 5846 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 5847 5848 switch (Name.getKind()) { 5849 case UnqualifiedId::IK_ImplicitSelfParam: 5850 case UnqualifiedId::IK_Identifier: 5851 case UnqualifiedId::IK_OperatorFunctionId: 5852 case UnqualifiedId::IK_LiteralOperatorId: 5853 case UnqualifiedId::IK_ConversionFunctionId: 5854 break; 5855 5856 case UnqualifiedId::IK_ConstructorName: 5857 case UnqualifiedId::IK_ConstructorTemplateId: 5858 // C++11 inheriting constructors. 5859 Diag(Name.getLocStart(), 5860 getLangOpts().CPlusPlus0x ? 5861 // FIXME: Produce warn_cxx98_compat_using_decl_constructor 5862 // instead once inheriting constructors work. 5863 diag::err_using_decl_constructor_unsupported : 5864 diag::err_using_decl_constructor) 5865 << SS.getRange(); 5866 5867 if (getLangOpts().CPlusPlus0x) break; 5868 5869 return 0; 5870 5871 case UnqualifiedId::IK_DestructorName: 5872 Diag(Name.getLocStart(), diag::err_using_decl_destructor) 5873 << SS.getRange(); 5874 return 0; 5875 5876 case UnqualifiedId::IK_TemplateId: 5877 Diag(Name.getLocStart(), diag::err_using_decl_template_id) 5878 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 5879 return 0; 5880 } 5881 5882 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name); 5883 DeclarationName TargetName = TargetNameInfo.getName(); 5884 if (!TargetName) 5885 return 0; 5886 5887 // Warn about using declarations. 5888 // TODO: store that the declaration was written without 'using' and 5889 // talk about access decls instead of using decls in the 5890 // diagnostics. 5891 if (!HasUsingKeyword) { 5892 UsingLoc = Name.getLocStart(); 5893 5894 Diag(UsingLoc, diag::warn_access_decl_deprecated) 5895 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 5896 } 5897 5898 if (DiagnoseUnexpandedParameterPack(SS, UPPC_UsingDeclaration) || 5899 DiagnoseUnexpandedParameterPack(TargetNameInfo, UPPC_UsingDeclaration)) 5900 return 0; 5901 5902 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 5903 TargetNameInfo, AttrList, 5904 /* IsInstantiation */ false, 5905 IsTypeName, TypenameLoc); 5906 if (UD) 5907 PushOnScopeChains(UD, S, /*AddToContext*/ false); 5908 5909 return UD; 5910} 5911 5912/// \brief Determine whether a using declaration considers the given 5913/// declarations as "equivalent", e.g., if they are redeclarations of 5914/// the same entity or are both typedefs of the same type. 5915static bool 5916IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2, 5917 bool &SuppressRedeclaration) { 5918 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) { 5919 SuppressRedeclaration = false; 5920 return true; 5921 } 5922 5923 if (TypedefNameDecl *TD1 = dyn_cast<TypedefNameDecl>(D1)) 5924 if (TypedefNameDecl *TD2 = dyn_cast<TypedefNameDecl>(D2)) { 5925 SuppressRedeclaration = true; 5926 return Context.hasSameType(TD1->getUnderlyingType(), 5927 TD2->getUnderlyingType()); 5928 } 5929 5930 return false; 5931} 5932 5933 5934/// Determines whether to create a using shadow decl for a particular 5935/// decl, given the set of decls existing prior to this using lookup. 5936bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 5937 const LookupResult &Previous) { 5938 // Diagnose finding a decl which is not from a base class of the 5939 // current class. We do this now because there are cases where this 5940 // function will silently decide not to build a shadow decl, which 5941 // will pre-empt further diagnostics. 5942 // 5943 // We don't need to do this in C++0x because we do the check once on 5944 // the qualifier. 5945 // 5946 // FIXME: diagnose the following if we care enough: 5947 // struct A { int foo; }; 5948 // struct B : A { using A::foo; }; 5949 // template <class T> struct C : A {}; 5950 // template <class T> struct D : C<T> { using B::foo; } // <--- 5951 // This is invalid (during instantiation) in C++03 because B::foo 5952 // resolves to the using decl in B, which is not a base class of D<T>. 5953 // We can't diagnose it immediately because C<T> is an unknown 5954 // specialization. The UsingShadowDecl in D<T> then points directly 5955 // to A::foo, which will look well-formed when we instantiate. 5956 // The right solution is to not collapse the shadow-decl chain. 5957 if (!getLangOpts().CPlusPlus0x && CurContext->isRecord()) { 5958 DeclContext *OrigDC = Orig->getDeclContext(); 5959 5960 // Handle enums and anonymous structs. 5961 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 5962 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 5963 while (OrigRec->isAnonymousStructOrUnion()) 5964 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 5965 5966 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 5967 if (OrigDC == CurContext) { 5968 Diag(Using->getLocation(), 5969 diag::err_using_decl_nested_name_specifier_is_current_class) 5970 << Using->getQualifierLoc().getSourceRange(); 5971 Diag(Orig->getLocation(), diag::note_using_decl_target); 5972 return true; 5973 } 5974 5975 Diag(Using->getQualifierLoc().getBeginLoc(), 5976 diag::err_using_decl_nested_name_specifier_is_not_base_class) 5977 << Using->getQualifier() 5978 << cast<CXXRecordDecl>(CurContext) 5979 << Using->getQualifierLoc().getSourceRange(); 5980 Diag(Orig->getLocation(), diag::note_using_decl_target); 5981 return true; 5982 } 5983 } 5984 5985 if (Previous.empty()) return false; 5986 5987 NamedDecl *Target = Orig; 5988 if (isa<UsingShadowDecl>(Target)) 5989 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 5990 5991 // If the target happens to be one of the previous declarations, we 5992 // don't have a conflict. 5993 // 5994 // FIXME: but we might be increasing its access, in which case we 5995 // should redeclare it. 5996 NamedDecl *NonTag = 0, *Tag = 0; 5997 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 5998 I != E; ++I) { 5999 NamedDecl *D = (*I)->getUnderlyingDecl(); 6000 bool Result; 6001 if (IsEquivalentForUsingDecl(Context, D, Target, Result)) 6002 return Result; 6003 6004 (isa<TagDecl>(D) ? Tag : NonTag) = D; 6005 } 6006 6007 if (Target->isFunctionOrFunctionTemplate()) { 6008 FunctionDecl *FD; 6009 if (isa<FunctionTemplateDecl>(Target)) 6010 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 6011 else 6012 FD = cast<FunctionDecl>(Target); 6013 6014 NamedDecl *OldDecl = 0; 6015 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 6016 case Ovl_Overload: 6017 return false; 6018 6019 case Ovl_NonFunction: 6020 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6021 break; 6022 6023 // We found a decl with the exact signature. 6024 case Ovl_Match: 6025 // If we're in a record, we want to hide the target, so we 6026 // return true (without a diagnostic) to tell the caller not to 6027 // build a shadow decl. 6028 if (CurContext->isRecord()) 6029 return true; 6030 6031 // If we're not in a record, this is an error. 6032 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6033 break; 6034 } 6035 6036 Diag(Target->getLocation(), diag::note_using_decl_target); 6037 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 6038 return true; 6039 } 6040 6041 // Target is not a function. 6042 6043 if (isa<TagDecl>(Target)) { 6044 // No conflict between a tag and a non-tag. 6045 if (!Tag) return false; 6046 6047 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6048 Diag(Target->getLocation(), diag::note_using_decl_target); 6049 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 6050 return true; 6051 } 6052 6053 // No conflict between a tag and a non-tag. 6054 if (!NonTag) return false; 6055 6056 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6057 Diag(Target->getLocation(), diag::note_using_decl_target); 6058 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 6059 return true; 6060} 6061 6062/// Builds a shadow declaration corresponding to a 'using' declaration. 6063UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 6064 UsingDecl *UD, 6065 NamedDecl *Orig) { 6066 6067 // If we resolved to another shadow declaration, just coalesce them. 6068 NamedDecl *Target = Orig; 6069 if (isa<UsingShadowDecl>(Target)) { 6070 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 6071 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 6072 } 6073 6074 UsingShadowDecl *Shadow 6075 = UsingShadowDecl::Create(Context, CurContext, 6076 UD->getLocation(), UD, Target); 6077 UD->addShadowDecl(Shadow); 6078 6079 Shadow->setAccess(UD->getAccess()); 6080 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 6081 Shadow->setInvalidDecl(); 6082 6083 if (S) 6084 PushOnScopeChains(Shadow, S); 6085 else 6086 CurContext->addDecl(Shadow); 6087 6088 6089 return Shadow; 6090} 6091 6092/// Hides a using shadow declaration. This is required by the current 6093/// using-decl implementation when a resolvable using declaration in a 6094/// class is followed by a declaration which would hide or override 6095/// one or more of the using decl's targets; for example: 6096/// 6097/// struct Base { void foo(int); }; 6098/// struct Derived : Base { 6099/// using Base::foo; 6100/// void foo(int); 6101/// }; 6102/// 6103/// The governing language is C++03 [namespace.udecl]p12: 6104/// 6105/// When a using-declaration brings names from a base class into a 6106/// derived class scope, member functions in the derived class 6107/// override and/or hide member functions with the same name and 6108/// parameter types in a base class (rather than conflicting). 6109/// 6110/// There are two ways to implement this: 6111/// (1) optimistically create shadow decls when they're not hidden 6112/// by existing declarations, or 6113/// (2) don't create any shadow decls (or at least don't make them 6114/// visible) until we've fully parsed/instantiated the class. 6115/// The problem with (1) is that we might have to retroactively remove 6116/// a shadow decl, which requires several O(n) operations because the 6117/// decl structures are (very reasonably) not designed for removal. 6118/// (2) avoids this but is very fiddly and phase-dependent. 6119void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 6120 if (Shadow->getDeclName().getNameKind() == 6121 DeclarationName::CXXConversionFunctionName) 6122 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 6123 6124 // Remove it from the DeclContext... 6125 Shadow->getDeclContext()->removeDecl(Shadow); 6126 6127 // ...and the scope, if applicable... 6128 if (S) { 6129 S->RemoveDecl(Shadow); 6130 IdResolver.RemoveDecl(Shadow); 6131 } 6132 6133 // ...and the using decl. 6134 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 6135 6136 // TODO: complain somehow if Shadow was used. It shouldn't 6137 // be possible for this to happen, because...? 6138} 6139 6140/// Builds a using declaration. 6141/// 6142/// \param IsInstantiation - Whether this call arises from an 6143/// instantiation of an unresolved using declaration. We treat 6144/// the lookup differently for these declarations. 6145NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 6146 SourceLocation UsingLoc, 6147 CXXScopeSpec &SS, 6148 const DeclarationNameInfo &NameInfo, 6149 AttributeList *AttrList, 6150 bool IsInstantiation, 6151 bool IsTypeName, 6152 SourceLocation TypenameLoc) { 6153 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 6154 SourceLocation IdentLoc = NameInfo.getLoc(); 6155 assert(IdentLoc.isValid() && "Invalid TargetName location."); 6156 6157 // FIXME: We ignore attributes for now. 6158 6159 if (SS.isEmpty()) { 6160 Diag(IdentLoc, diag::err_using_requires_qualname); 6161 return 0; 6162 } 6163 6164 // Do the redeclaration lookup in the current scope. 6165 LookupResult Previous(*this, NameInfo, LookupUsingDeclName, 6166 ForRedeclaration); 6167 Previous.setHideTags(false); 6168 if (S) { 6169 LookupName(Previous, S); 6170 6171 // It is really dumb that we have to do this. 6172 LookupResult::Filter F = Previous.makeFilter(); 6173 while (F.hasNext()) { 6174 NamedDecl *D = F.next(); 6175 if (!isDeclInScope(D, CurContext, S)) 6176 F.erase(); 6177 } 6178 F.done(); 6179 } else { 6180 assert(IsInstantiation && "no scope in non-instantiation"); 6181 assert(CurContext->isRecord() && "scope not record in instantiation"); 6182 LookupQualifiedName(Previous, CurContext); 6183 } 6184 6185 // Check for invalid redeclarations. 6186 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 6187 return 0; 6188 6189 // Check for bad qualifiers. 6190 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 6191 return 0; 6192 6193 DeclContext *LookupContext = computeDeclContext(SS); 6194 NamedDecl *D; 6195 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 6196 if (!LookupContext) { 6197 if (IsTypeName) { 6198 // FIXME: not all declaration name kinds are legal here 6199 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 6200 UsingLoc, TypenameLoc, 6201 QualifierLoc, 6202 IdentLoc, NameInfo.getName()); 6203 } else { 6204 D = UnresolvedUsingValueDecl::Create(Context, CurContext, UsingLoc, 6205 QualifierLoc, NameInfo); 6206 } 6207 } else { 6208 D = UsingDecl::Create(Context, CurContext, UsingLoc, QualifierLoc, 6209 NameInfo, IsTypeName); 6210 } 6211 D->setAccess(AS); 6212 CurContext->addDecl(D); 6213 6214 if (!LookupContext) return D; 6215 UsingDecl *UD = cast<UsingDecl>(D); 6216 6217 if (RequireCompleteDeclContext(SS, LookupContext)) { 6218 UD->setInvalidDecl(); 6219 return UD; 6220 } 6221 6222 // The normal rules do not apply to inheriting constructor declarations. 6223 if (NameInfo.getName().getNameKind() == DeclarationName::CXXConstructorName) { 6224 if (CheckInheritingConstructorUsingDecl(UD)) 6225 UD->setInvalidDecl(); 6226 return UD; 6227 } 6228 6229 // Otherwise, look up the target name. 6230 6231 LookupResult R(*this, NameInfo, LookupOrdinaryName); 6232 6233 // Unlike most lookups, we don't always want to hide tag 6234 // declarations: tag names are visible through the using declaration 6235 // even if hidden by ordinary names, *except* in a dependent context 6236 // where it's important for the sanity of two-phase lookup. 6237 if (!IsInstantiation) 6238 R.setHideTags(false); 6239 6240 // For the purposes of this lookup, we have a base object type 6241 // equal to that of the current context. 6242 if (CurContext->isRecord()) { 6243 R.setBaseObjectType( 6244 Context.getTypeDeclType(cast<CXXRecordDecl>(CurContext))); 6245 } 6246 6247 LookupQualifiedName(R, LookupContext); 6248 6249 if (R.empty()) { 6250 Diag(IdentLoc, diag::err_no_member) 6251 << NameInfo.getName() << LookupContext << SS.getRange(); 6252 UD->setInvalidDecl(); 6253 return UD; 6254 } 6255 6256 if (R.isAmbiguous()) { 6257 UD->setInvalidDecl(); 6258 return UD; 6259 } 6260 6261 if (IsTypeName) { 6262 // If we asked for a typename and got a non-type decl, error out. 6263 if (!R.getAsSingle<TypeDecl>()) { 6264 Diag(IdentLoc, diag::err_using_typename_non_type); 6265 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 6266 Diag((*I)->getUnderlyingDecl()->getLocation(), 6267 diag::note_using_decl_target); 6268 UD->setInvalidDecl(); 6269 return UD; 6270 } 6271 } else { 6272 // If we asked for a non-typename and we got a type, error out, 6273 // but only if this is an instantiation of an unresolved using 6274 // decl. Otherwise just silently find the type name. 6275 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 6276 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 6277 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 6278 UD->setInvalidDecl(); 6279 return UD; 6280 } 6281 } 6282 6283 // C++0x N2914 [namespace.udecl]p6: 6284 // A using-declaration shall not name a namespace. 6285 if (R.getAsSingle<NamespaceDecl>()) { 6286 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 6287 << SS.getRange(); 6288 UD->setInvalidDecl(); 6289 return UD; 6290 } 6291 6292 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 6293 if (!CheckUsingShadowDecl(UD, *I, Previous)) 6294 BuildUsingShadowDecl(S, UD, *I); 6295 } 6296 6297 return UD; 6298} 6299 6300/// Additional checks for a using declaration referring to a constructor name. 6301bool Sema::CheckInheritingConstructorUsingDecl(UsingDecl *UD) { 6302 assert(!UD->isTypeName() && "expecting a constructor name"); 6303 6304 const Type *SourceType = UD->getQualifier()->getAsType(); 6305 assert(SourceType && 6306 "Using decl naming constructor doesn't have type in scope spec."); 6307 CXXRecordDecl *TargetClass = cast<CXXRecordDecl>(CurContext); 6308 6309 // Check whether the named type is a direct base class. 6310 CanQualType CanonicalSourceType = SourceType->getCanonicalTypeUnqualified(); 6311 CXXRecordDecl::base_class_iterator BaseIt, BaseE; 6312 for (BaseIt = TargetClass->bases_begin(), BaseE = TargetClass->bases_end(); 6313 BaseIt != BaseE; ++BaseIt) { 6314 CanQualType BaseType = BaseIt->getType()->getCanonicalTypeUnqualified(); 6315 if (CanonicalSourceType == BaseType) 6316 break; 6317 if (BaseIt->getType()->isDependentType()) 6318 break; 6319 } 6320 6321 if (BaseIt == BaseE) { 6322 // Did not find SourceType in the bases. 6323 Diag(UD->getUsingLocation(), 6324 diag::err_using_decl_constructor_not_in_direct_base) 6325 << UD->getNameInfo().getSourceRange() 6326 << QualType(SourceType, 0) << TargetClass; 6327 return true; 6328 } 6329 6330 if (!CurContext->isDependentContext()) 6331 BaseIt->setInheritConstructors(); 6332 6333 return false; 6334} 6335 6336/// Checks that the given using declaration is not an invalid 6337/// redeclaration. Note that this is checking only for the using decl 6338/// itself, not for any ill-formedness among the UsingShadowDecls. 6339bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 6340 bool isTypeName, 6341 const CXXScopeSpec &SS, 6342 SourceLocation NameLoc, 6343 const LookupResult &Prev) { 6344 // C++03 [namespace.udecl]p8: 6345 // C++0x [namespace.udecl]p10: 6346 // A using-declaration is a declaration and can therefore be used 6347 // repeatedly where (and only where) multiple declarations are 6348 // allowed. 6349 // 6350 // That's in non-member contexts. 6351 if (!CurContext->getRedeclContext()->isRecord()) 6352 return false; 6353 6354 NestedNameSpecifier *Qual 6355 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 6356 6357 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 6358 NamedDecl *D = *I; 6359 6360 bool DTypename; 6361 NestedNameSpecifier *DQual; 6362 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 6363 DTypename = UD->isTypeName(); 6364 DQual = UD->getQualifier(); 6365 } else if (UnresolvedUsingValueDecl *UD 6366 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 6367 DTypename = false; 6368 DQual = UD->getQualifier(); 6369 } else if (UnresolvedUsingTypenameDecl *UD 6370 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 6371 DTypename = true; 6372 DQual = UD->getQualifier(); 6373 } else continue; 6374 6375 // using decls differ if one says 'typename' and the other doesn't. 6376 // FIXME: non-dependent using decls? 6377 if (isTypeName != DTypename) continue; 6378 6379 // using decls differ if they name different scopes (but note that 6380 // template instantiation can cause this check to trigger when it 6381 // didn't before instantiation). 6382 if (Context.getCanonicalNestedNameSpecifier(Qual) != 6383 Context.getCanonicalNestedNameSpecifier(DQual)) 6384 continue; 6385 6386 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 6387 Diag(D->getLocation(), diag::note_using_decl) << 1; 6388 return true; 6389 } 6390 6391 return false; 6392} 6393 6394 6395/// Checks that the given nested-name qualifier used in a using decl 6396/// in the current context is appropriately related to the current 6397/// scope. If an error is found, diagnoses it and returns true. 6398bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 6399 const CXXScopeSpec &SS, 6400 SourceLocation NameLoc) { 6401 DeclContext *NamedContext = computeDeclContext(SS); 6402 6403 if (!CurContext->isRecord()) { 6404 // C++03 [namespace.udecl]p3: 6405 // C++0x [namespace.udecl]p8: 6406 // A using-declaration for a class member shall be a member-declaration. 6407 6408 // If we weren't able to compute a valid scope, it must be a 6409 // dependent class scope. 6410 if (!NamedContext || NamedContext->isRecord()) { 6411 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 6412 << SS.getRange(); 6413 return true; 6414 } 6415 6416 // Otherwise, everything is known to be fine. 6417 return false; 6418 } 6419 6420 // The current scope is a record. 6421 6422 // If the named context is dependent, we can't decide much. 6423 if (!NamedContext) { 6424 // FIXME: in C++0x, we can diagnose if we can prove that the 6425 // nested-name-specifier does not refer to a base class, which is 6426 // still possible in some cases. 6427 6428 // Otherwise we have to conservatively report that things might be 6429 // okay. 6430 return false; 6431 } 6432 6433 if (!NamedContext->isRecord()) { 6434 // Ideally this would point at the last name in the specifier, 6435 // but we don't have that level of source info. 6436 Diag(SS.getRange().getBegin(), 6437 diag::err_using_decl_nested_name_specifier_is_not_class) 6438 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 6439 return true; 6440 } 6441 6442 if (!NamedContext->isDependentContext() && 6443 RequireCompleteDeclContext(const_cast<CXXScopeSpec&>(SS), NamedContext)) 6444 return true; 6445 6446 if (getLangOpts().CPlusPlus0x) { 6447 // C++0x [namespace.udecl]p3: 6448 // In a using-declaration used as a member-declaration, the 6449 // nested-name-specifier shall name a base class of the class 6450 // being defined. 6451 6452 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 6453 cast<CXXRecordDecl>(NamedContext))) { 6454 if (CurContext == NamedContext) { 6455 Diag(NameLoc, 6456 diag::err_using_decl_nested_name_specifier_is_current_class) 6457 << SS.getRange(); 6458 return true; 6459 } 6460 6461 Diag(SS.getRange().getBegin(), 6462 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6463 << (NestedNameSpecifier*) SS.getScopeRep() 6464 << cast<CXXRecordDecl>(CurContext) 6465 << SS.getRange(); 6466 return true; 6467 } 6468 6469 return false; 6470 } 6471 6472 // C++03 [namespace.udecl]p4: 6473 // A using-declaration used as a member-declaration shall refer 6474 // to a member of a base class of the class being defined [etc.]. 6475 6476 // Salient point: SS doesn't have to name a base class as long as 6477 // lookup only finds members from base classes. Therefore we can 6478 // diagnose here only if we can prove that that can't happen, 6479 // i.e. if the class hierarchies provably don't intersect. 6480 6481 // TODO: it would be nice if "definitely valid" results were cached 6482 // in the UsingDecl and UsingShadowDecl so that these checks didn't 6483 // need to be repeated. 6484 6485 struct UserData { 6486 llvm::SmallPtrSet<const CXXRecordDecl*, 4> Bases; 6487 6488 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 6489 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 6490 Data->Bases.insert(Base); 6491 return true; 6492 } 6493 6494 bool hasDependentBases(const CXXRecordDecl *Class) { 6495 return !Class->forallBases(collect, this); 6496 } 6497 6498 /// Returns true if the base is dependent or is one of the 6499 /// accumulated base classes. 6500 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 6501 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 6502 return !Data->Bases.count(Base); 6503 } 6504 6505 bool mightShareBases(const CXXRecordDecl *Class) { 6506 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 6507 } 6508 }; 6509 6510 UserData Data; 6511 6512 // Returns false if we find a dependent base. 6513 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 6514 return false; 6515 6516 // Returns false if the class has a dependent base or if it or one 6517 // of its bases is present in the base set of the current context. 6518 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 6519 return false; 6520 6521 Diag(SS.getRange().getBegin(), 6522 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6523 << (NestedNameSpecifier*) SS.getScopeRep() 6524 << cast<CXXRecordDecl>(CurContext) 6525 << SS.getRange(); 6526 6527 return true; 6528} 6529 6530Decl *Sema::ActOnAliasDeclaration(Scope *S, 6531 AccessSpecifier AS, 6532 MultiTemplateParamsArg TemplateParamLists, 6533 SourceLocation UsingLoc, 6534 UnqualifiedId &Name, 6535 TypeResult Type) { 6536 // Skip up to the relevant declaration scope. 6537 while (S->getFlags() & Scope::TemplateParamScope) 6538 S = S->getParent(); 6539 assert((S->getFlags() & Scope::DeclScope) && 6540 "got alias-declaration outside of declaration scope"); 6541 6542 if (Type.isInvalid()) 6543 return 0; 6544 6545 bool Invalid = false; 6546 DeclarationNameInfo NameInfo = GetNameFromUnqualifiedId(Name); 6547 TypeSourceInfo *TInfo = 0; 6548 GetTypeFromParser(Type.get(), &TInfo); 6549 6550 if (DiagnoseClassNameShadow(CurContext, NameInfo)) 6551 return 0; 6552 6553 if (DiagnoseUnexpandedParameterPack(Name.StartLocation, TInfo, 6554 UPPC_DeclarationType)) { 6555 Invalid = true; 6556 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 6557 TInfo->getTypeLoc().getBeginLoc()); 6558 } 6559 6560 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, ForRedeclaration); 6561 LookupName(Previous, S); 6562 6563 // Warn about shadowing the name of a template parameter. 6564 if (Previous.isSingleResult() && 6565 Previous.getFoundDecl()->isTemplateParameter()) { 6566 DiagnoseTemplateParameterShadow(Name.StartLocation,Previous.getFoundDecl()); 6567 Previous.clear(); 6568 } 6569 6570 assert(Name.Kind == UnqualifiedId::IK_Identifier && 6571 "name in alias declaration must be an identifier"); 6572 TypeAliasDecl *NewTD = TypeAliasDecl::Create(Context, CurContext, UsingLoc, 6573 Name.StartLocation, 6574 Name.Identifier, TInfo); 6575 6576 NewTD->setAccess(AS); 6577 6578 if (Invalid) 6579 NewTD->setInvalidDecl(); 6580 6581 CheckTypedefForVariablyModifiedType(S, NewTD); 6582 Invalid |= NewTD->isInvalidDecl(); 6583 6584 bool Redeclaration = false; 6585 6586 NamedDecl *NewND; 6587 if (TemplateParamLists.size()) { 6588 TypeAliasTemplateDecl *OldDecl = 0; 6589 TemplateParameterList *OldTemplateParams = 0; 6590 6591 if (TemplateParamLists.size() != 1) { 6592 Diag(UsingLoc, diag::err_alias_template_extra_headers) 6593 << SourceRange(TemplateParamLists[1]->getTemplateLoc(), 6594 TemplateParamLists[TemplateParamLists.size()-1]->getRAngleLoc()); 6595 } 6596 TemplateParameterList *TemplateParams = TemplateParamLists[0]; 6597 6598 // Only consider previous declarations in the same scope. 6599 FilterLookupForScope(Previous, CurContext, S, /*ConsiderLinkage*/false, 6600 /*ExplicitInstantiationOrSpecialization*/false); 6601 if (!Previous.empty()) { 6602 Redeclaration = true; 6603 6604 OldDecl = Previous.getAsSingle<TypeAliasTemplateDecl>(); 6605 if (!OldDecl && !Invalid) { 6606 Diag(UsingLoc, diag::err_redefinition_different_kind) 6607 << Name.Identifier; 6608 6609 NamedDecl *OldD = Previous.getRepresentativeDecl(); 6610 if (OldD->getLocation().isValid()) 6611 Diag(OldD->getLocation(), diag::note_previous_definition); 6612 6613 Invalid = true; 6614 } 6615 6616 if (!Invalid && OldDecl && !OldDecl->isInvalidDecl()) { 6617 if (TemplateParameterListsAreEqual(TemplateParams, 6618 OldDecl->getTemplateParameters(), 6619 /*Complain=*/true, 6620 TPL_TemplateMatch)) 6621 OldTemplateParams = OldDecl->getTemplateParameters(); 6622 else 6623 Invalid = true; 6624 6625 TypeAliasDecl *OldTD = OldDecl->getTemplatedDecl(); 6626 if (!Invalid && 6627 !Context.hasSameType(OldTD->getUnderlyingType(), 6628 NewTD->getUnderlyingType())) { 6629 // FIXME: The C++0x standard does not clearly say this is ill-formed, 6630 // but we can't reasonably accept it. 6631 Diag(NewTD->getLocation(), diag::err_redefinition_different_typedef) 6632 << 2 << NewTD->getUnderlyingType() << OldTD->getUnderlyingType(); 6633 if (OldTD->getLocation().isValid()) 6634 Diag(OldTD->getLocation(), diag::note_previous_definition); 6635 Invalid = true; 6636 } 6637 } 6638 } 6639 6640 // Merge any previous default template arguments into our parameters, 6641 // and check the parameter list. 6642 if (CheckTemplateParameterList(TemplateParams, OldTemplateParams, 6643 TPC_TypeAliasTemplate)) 6644 return 0; 6645 6646 TypeAliasTemplateDecl *NewDecl = 6647 TypeAliasTemplateDecl::Create(Context, CurContext, UsingLoc, 6648 Name.Identifier, TemplateParams, 6649 NewTD); 6650 6651 NewDecl->setAccess(AS); 6652 6653 if (Invalid) 6654 NewDecl->setInvalidDecl(); 6655 else if (OldDecl) 6656 NewDecl->setPreviousDeclaration(OldDecl); 6657 6658 NewND = NewDecl; 6659 } else { 6660 ActOnTypedefNameDecl(S, CurContext, NewTD, Previous, Redeclaration); 6661 NewND = NewTD; 6662 } 6663 6664 if (!Redeclaration) 6665 PushOnScopeChains(NewND, S); 6666 6667 ActOnDocumentableDecl(NewND); 6668 return NewND; 6669} 6670 6671Decl *Sema::ActOnNamespaceAliasDef(Scope *S, 6672 SourceLocation NamespaceLoc, 6673 SourceLocation AliasLoc, 6674 IdentifierInfo *Alias, 6675 CXXScopeSpec &SS, 6676 SourceLocation IdentLoc, 6677 IdentifierInfo *Ident) { 6678 6679 // Lookup the namespace name. 6680 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 6681 LookupParsedName(R, S, &SS); 6682 6683 // Check if we have a previous declaration with the same name. 6684 NamedDecl *PrevDecl 6685 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 6686 ForRedeclaration); 6687 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 6688 PrevDecl = 0; 6689 6690 if (PrevDecl) { 6691 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 6692 // We already have an alias with the same name that points to the same 6693 // namespace, so don't create a new one. 6694 // FIXME: At some point, we'll want to create the (redundant) 6695 // declaration to maintain better source information. 6696 if (!R.isAmbiguous() && !R.empty() && 6697 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 6698 return 0; 6699 } 6700 6701 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 6702 diag::err_redefinition_different_kind; 6703 Diag(AliasLoc, DiagID) << Alias; 6704 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 6705 return 0; 6706 } 6707 6708 if (R.isAmbiguous()) 6709 return 0; 6710 6711 if (R.empty()) { 6712 if (!TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, Ident)) { 6713 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 6714 return 0; 6715 } 6716 } 6717 6718 NamespaceAliasDecl *AliasDecl = 6719 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 6720 Alias, SS.getWithLocInContext(Context), 6721 IdentLoc, R.getFoundDecl()); 6722 6723 PushOnScopeChains(AliasDecl, S); 6724 return AliasDecl; 6725} 6726 6727namespace { 6728 /// \brief Scoped object used to handle the state changes required in Sema 6729 /// to implicitly define the body of a C++ member function; 6730 class ImplicitlyDefinedFunctionScope { 6731 Sema &S; 6732 Sema::ContextRAII SavedContext; 6733 6734 public: 6735 ImplicitlyDefinedFunctionScope(Sema &S, CXXMethodDecl *Method) 6736 : S(S), SavedContext(S, Method) 6737 { 6738 S.PushFunctionScope(); 6739 S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated); 6740 } 6741 6742 ~ImplicitlyDefinedFunctionScope() { 6743 S.PopExpressionEvaluationContext(); 6744 S.PopFunctionScopeInfo(); 6745 } 6746 }; 6747} 6748 6749Sema::ImplicitExceptionSpecification 6750Sema::ComputeDefaultedDefaultCtorExceptionSpec(SourceLocation Loc, 6751 CXXMethodDecl *MD) { 6752 CXXRecordDecl *ClassDecl = MD->getParent(); 6753 6754 // C++ [except.spec]p14: 6755 // An implicitly declared special member function (Clause 12) shall have an 6756 // exception-specification. [...] 6757 ImplicitExceptionSpecification ExceptSpec(*this); 6758 if (ClassDecl->isInvalidDecl()) 6759 return ExceptSpec; 6760 6761 // Direct base-class constructors. 6762 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 6763 BEnd = ClassDecl->bases_end(); 6764 B != BEnd; ++B) { 6765 if (B->isVirtual()) // Handled below. 6766 continue; 6767 6768 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 6769 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 6770 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 6771 // If this is a deleted function, add it anyway. This might be conformant 6772 // with the standard. This might not. I'm not sure. It might not matter. 6773 if (Constructor) 6774 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 6775 } 6776 } 6777 6778 // Virtual base-class constructors. 6779 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 6780 BEnd = ClassDecl->vbases_end(); 6781 B != BEnd; ++B) { 6782 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 6783 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 6784 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 6785 // If this is a deleted function, add it anyway. This might be conformant 6786 // with the standard. This might not. I'm not sure. It might not matter. 6787 if (Constructor) 6788 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 6789 } 6790 } 6791 6792 // Field constructors. 6793 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 6794 FEnd = ClassDecl->field_end(); 6795 F != FEnd; ++F) { 6796 if (F->hasInClassInitializer()) { 6797 if (Expr *E = F->getInClassInitializer()) 6798 ExceptSpec.CalledExpr(E); 6799 else if (!F->isInvalidDecl()) 6800 // DR1351: 6801 // If the brace-or-equal-initializer of a non-static data member 6802 // invokes a defaulted default constructor of its class or of an 6803 // enclosing class in a potentially evaluated subexpression, the 6804 // program is ill-formed. 6805 // 6806 // This resolution is unworkable: the exception specification of the 6807 // default constructor can be needed in an unevaluated context, in 6808 // particular, in the operand of a noexcept-expression, and we can be 6809 // unable to compute an exception specification for an enclosed class. 6810 // 6811 // We do not allow an in-class initializer to require the evaluation 6812 // of the exception specification for any in-class initializer whose 6813 // definition is not lexically complete. 6814 Diag(Loc, diag::err_in_class_initializer_references_def_ctor) << MD; 6815 } else if (const RecordType *RecordTy 6816 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 6817 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 6818 CXXConstructorDecl *Constructor = LookupDefaultConstructor(FieldRecDecl); 6819 // If this is a deleted function, add it anyway. This might be conformant 6820 // with the standard. This might not. I'm not sure. It might not matter. 6821 // In particular, the problem is that this function never gets called. It 6822 // might just be ill-formed because this function attempts to refer to 6823 // a deleted function here. 6824 if (Constructor) 6825 ExceptSpec.CalledDecl(F->getLocation(), Constructor); 6826 } 6827 } 6828 6829 return ExceptSpec; 6830} 6831 6832CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( 6833 CXXRecordDecl *ClassDecl) { 6834 // C++ [class.ctor]p5: 6835 // A default constructor for a class X is a constructor of class X 6836 // that can be called without an argument. If there is no 6837 // user-declared constructor for class X, a default constructor is 6838 // implicitly declared. An implicitly-declared default constructor 6839 // is an inline public member of its class. 6840 assert(!ClassDecl->hasUserDeclaredConstructor() && 6841 "Should not build implicit default constructor!"); 6842 6843 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, 6844 CXXDefaultConstructor, 6845 false); 6846 6847 // Create the actual constructor declaration. 6848 CanQualType ClassType 6849 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 6850 SourceLocation ClassLoc = ClassDecl->getLocation(); 6851 DeclarationName Name 6852 = Context.DeclarationNames.getCXXConstructorName(ClassType); 6853 DeclarationNameInfo NameInfo(Name, ClassLoc); 6854 CXXConstructorDecl *DefaultCon = CXXConstructorDecl::Create( 6855 Context, ClassDecl, ClassLoc, NameInfo, /*Type*/QualType(), /*TInfo=*/0, 6856 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 6857 Constexpr); 6858 DefaultCon->setAccess(AS_public); 6859 DefaultCon->setDefaulted(); 6860 DefaultCon->setImplicit(); 6861 DefaultCon->setTrivial(ClassDecl->hasTrivialDefaultConstructor()); 6862 6863 // Build an exception specification pointing back at this constructor. 6864 FunctionProtoType::ExtProtoInfo EPI; 6865 EPI.ExceptionSpecType = EST_Unevaluated; 6866 EPI.ExceptionSpecDecl = DefaultCon; 6867 DefaultCon->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 6868 6869 // Note that we have declared this constructor. 6870 ++ASTContext::NumImplicitDefaultConstructorsDeclared; 6871 6872 if (Scope *S = getScopeForContext(ClassDecl)) 6873 PushOnScopeChains(DefaultCon, S, false); 6874 ClassDecl->addDecl(DefaultCon); 6875 6876 if (ShouldDeleteSpecialMember(DefaultCon, CXXDefaultConstructor)) 6877 DefaultCon->setDeletedAsWritten(); 6878 6879 return DefaultCon; 6880} 6881 6882void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 6883 CXXConstructorDecl *Constructor) { 6884 assert((Constructor->isDefaulted() && Constructor->isDefaultConstructor() && 6885 !Constructor->doesThisDeclarationHaveABody() && 6886 !Constructor->isDeleted()) && 6887 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 6888 6889 CXXRecordDecl *ClassDecl = Constructor->getParent(); 6890 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 6891 6892 ImplicitlyDefinedFunctionScope Scope(*this, Constructor); 6893 DiagnosticErrorTrap Trap(Diags); 6894 if (SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false) || 6895 Trap.hasErrorOccurred()) { 6896 Diag(CurrentLocation, diag::note_member_synthesized_at) 6897 << CXXDefaultConstructor << Context.getTagDeclType(ClassDecl); 6898 Constructor->setInvalidDecl(); 6899 return; 6900 } 6901 6902 SourceLocation Loc = Constructor->getLocation(); 6903 Constructor->setBody(new (Context) CompoundStmt(Loc)); 6904 6905 Constructor->setUsed(); 6906 MarkVTableUsed(CurrentLocation, ClassDecl); 6907 6908 if (ASTMutationListener *L = getASTMutationListener()) { 6909 L->CompletedImplicitDefinition(Constructor); 6910 } 6911} 6912 6913void Sema::ActOnFinishDelayedMemberInitializers(Decl *D) { 6914 if (!D) return; 6915 AdjustDeclIfTemplate(D); 6916 6917 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(D); 6918 6919 if (!ClassDecl->isDependentType()) 6920 CheckExplicitlyDefaultedMethods(ClassDecl); 6921} 6922 6923void Sema::DeclareInheritedConstructors(CXXRecordDecl *ClassDecl) { 6924 // We start with an initial pass over the base classes to collect those that 6925 // inherit constructors from. If there are none, we can forgo all further 6926 // processing. 6927 typedef SmallVector<const RecordType *, 4> BasesVector; 6928 BasesVector BasesToInheritFrom; 6929 for (CXXRecordDecl::base_class_iterator BaseIt = ClassDecl->bases_begin(), 6930 BaseE = ClassDecl->bases_end(); 6931 BaseIt != BaseE; ++BaseIt) { 6932 if (BaseIt->getInheritConstructors()) { 6933 QualType Base = BaseIt->getType(); 6934 if (Base->isDependentType()) { 6935 // If we inherit constructors from anything that is dependent, just 6936 // abort processing altogether. We'll get another chance for the 6937 // instantiations. 6938 return; 6939 } 6940 BasesToInheritFrom.push_back(Base->castAs<RecordType>()); 6941 } 6942 } 6943 if (BasesToInheritFrom.empty()) 6944 return; 6945 6946 // Now collect the constructors that we already have in the current class. 6947 // Those take precedence over inherited constructors. 6948 // C++0x [class.inhctor]p3: [...] a constructor is implicitly declared [...] 6949 // unless there is a user-declared constructor with the same signature in 6950 // the class where the using-declaration appears. 6951 llvm::SmallSet<const Type *, 8> ExistingConstructors; 6952 for (CXXRecordDecl::ctor_iterator CtorIt = ClassDecl->ctor_begin(), 6953 CtorE = ClassDecl->ctor_end(); 6954 CtorIt != CtorE; ++CtorIt) { 6955 ExistingConstructors.insert( 6956 Context.getCanonicalType(CtorIt->getType()).getTypePtr()); 6957 } 6958 6959 DeclarationName CreatedCtorName = 6960 Context.DeclarationNames.getCXXConstructorName( 6961 ClassDecl->getTypeForDecl()->getCanonicalTypeUnqualified()); 6962 6963 // Now comes the true work. 6964 // First, we keep a map from constructor types to the base that introduced 6965 // them. Needed for finding conflicting constructors. We also keep the 6966 // actually inserted declarations in there, for pretty diagnostics. 6967 typedef std::pair<CanQualType, CXXConstructorDecl *> ConstructorInfo; 6968 typedef llvm::DenseMap<const Type *, ConstructorInfo> ConstructorToSourceMap; 6969 ConstructorToSourceMap InheritedConstructors; 6970 for (BasesVector::iterator BaseIt = BasesToInheritFrom.begin(), 6971 BaseE = BasesToInheritFrom.end(); 6972 BaseIt != BaseE; ++BaseIt) { 6973 const RecordType *Base = *BaseIt; 6974 CanQualType CanonicalBase = Base->getCanonicalTypeUnqualified(); 6975 CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(Base->getDecl()); 6976 for (CXXRecordDecl::ctor_iterator CtorIt = BaseDecl->ctor_begin(), 6977 CtorE = BaseDecl->ctor_end(); 6978 CtorIt != CtorE; ++CtorIt) { 6979 // Find the using declaration for inheriting this base's constructors. 6980 // FIXME: Don't perform name lookup just to obtain a source location! 6981 DeclarationName Name = 6982 Context.DeclarationNames.getCXXConstructorName(CanonicalBase); 6983 LookupResult Result(*this, Name, SourceLocation(), LookupUsingDeclName); 6984 LookupQualifiedName(Result, CurContext); 6985 UsingDecl *UD = Result.getAsSingle<UsingDecl>(); 6986 SourceLocation UsingLoc = UD ? UD->getLocation() : 6987 ClassDecl->getLocation(); 6988 6989 // C++0x [class.inhctor]p1: The candidate set of inherited constructors 6990 // from the class X named in the using-declaration consists of actual 6991 // constructors and notional constructors that result from the 6992 // transformation of defaulted parameters as follows: 6993 // - all non-template default constructors of X, and 6994 // - for each non-template constructor of X that has at least one 6995 // parameter with a default argument, the set of constructors that 6996 // results from omitting any ellipsis parameter specification and 6997 // successively omitting parameters with a default argument from the 6998 // end of the parameter-type-list. 6999 CXXConstructorDecl *BaseCtor = *CtorIt; 7000 bool CanBeCopyOrMove = BaseCtor->isCopyOrMoveConstructor(); 7001 const FunctionProtoType *BaseCtorType = 7002 BaseCtor->getType()->getAs<FunctionProtoType>(); 7003 7004 for (unsigned params = BaseCtor->getMinRequiredArguments(), 7005 maxParams = BaseCtor->getNumParams(); 7006 params <= maxParams; ++params) { 7007 // Skip default constructors. They're never inherited. 7008 if (params == 0) 7009 continue; 7010 // Skip copy and move constructors for the same reason. 7011 if (CanBeCopyOrMove && params == 1) 7012 continue; 7013 7014 // Build up a function type for this particular constructor. 7015 // FIXME: The working paper does not consider that the exception spec 7016 // for the inheriting constructor might be larger than that of the 7017 // source. This code doesn't yet, either. When it does, this code will 7018 // need to be delayed until after exception specifications and in-class 7019 // member initializers are attached. 7020 const Type *NewCtorType; 7021 if (params == maxParams) 7022 NewCtorType = BaseCtorType; 7023 else { 7024 SmallVector<QualType, 16> Args; 7025 for (unsigned i = 0; i < params; ++i) { 7026 Args.push_back(BaseCtorType->getArgType(i)); 7027 } 7028 FunctionProtoType::ExtProtoInfo ExtInfo = 7029 BaseCtorType->getExtProtoInfo(); 7030 ExtInfo.Variadic = false; 7031 NewCtorType = Context.getFunctionType(BaseCtorType->getResultType(), 7032 Args.data(), params, ExtInfo) 7033 .getTypePtr(); 7034 } 7035 const Type *CanonicalNewCtorType = 7036 Context.getCanonicalType(NewCtorType); 7037 7038 // Now that we have the type, first check if the class already has a 7039 // constructor with this signature. 7040 if (ExistingConstructors.count(CanonicalNewCtorType)) 7041 continue; 7042 7043 // Then we check if we have already declared an inherited constructor 7044 // with this signature. 7045 std::pair<ConstructorToSourceMap::iterator, bool> result = 7046 InheritedConstructors.insert(std::make_pair( 7047 CanonicalNewCtorType, 7048 std::make_pair(CanonicalBase, (CXXConstructorDecl*)0))); 7049 if (!result.second) { 7050 // Already in the map. If it came from a different class, that's an 7051 // error. Not if it's from the same. 7052 CanQualType PreviousBase = result.first->second.first; 7053 if (CanonicalBase != PreviousBase) { 7054 const CXXConstructorDecl *PrevCtor = result.first->second.second; 7055 const CXXConstructorDecl *PrevBaseCtor = 7056 PrevCtor->getInheritedConstructor(); 7057 assert(PrevBaseCtor && "Conflicting constructor was not inherited"); 7058 7059 Diag(UsingLoc, diag::err_using_decl_constructor_conflict); 7060 Diag(BaseCtor->getLocation(), 7061 diag::note_using_decl_constructor_conflict_current_ctor); 7062 Diag(PrevBaseCtor->getLocation(), 7063 diag::note_using_decl_constructor_conflict_previous_ctor); 7064 Diag(PrevCtor->getLocation(), 7065 diag::note_using_decl_constructor_conflict_previous_using); 7066 } 7067 continue; 7068 } 7069 7070 // OK, we're there, now add the constructor. 7071 // C++0x [class.inhctor]p8: [...] that would be performed by a 7072 // user-written inline constructor [...] 7073 DeclarationNameInfo DNI(CreatedCtorName, UsingLoc); 7074 CXXConstructorDecl *NewCtor = CXXConstructorDecl::Create( 7075 Context, ClassDecl, UsingLoc, DNI, QualType(NewCtorType, 0), 7076 /*TInfo=*/0, BaseCtor->isExplicit(), /*Inline=*/true, 7077 /*ImplicitlyDeclared=*/true, 7078 // FIXME: Due to a defect in the standard, we treat inherited 7079 // constructors as constexpr even if that makes them ill-formed. 7080 /*Constexpr=*/BaseCtor->isConstexpr()); 7081 NewCtor->setAccess(BaseCtor->getAccess()); 7082 7083 // Build up the parameter decls and add them. 7084 SmallVector<ParmVarDecl *, 16> ParamDecls; 7085 for (unsigned i = 0; i < params; ++i) { 7086 ParamDecls.push_back(ParmVarDecl::Create(Context, NewCtor, 7087 UsingLoc, UsingLoc, 7088 /*IdentifierInfo=*/0, 7089 BaseCtorType->getArgType(i), 7090 /*TInfo=*/0, SC_None, 7091 SC_None, /*DefaultArg=*/0)); 7092 } 7093 NewCtor->setParams(ParamDecls); 7094 NewCtor->setInheritedConstructor(BaseCtor); 7095 7096 ClassDecl->addDecl(NewCtor); 7097 result.first->second.second = NewCtor; 7098 } 7099 } 7100 } 7101} 7102 7103Sema::ImplicitExceptionSpecification 7104Sema::ComputeDefaultedDtorExceptionSpec(CXXMethodDecl *MD) { 7105 CXXRecordDecl *ClassDecl = MD->getParent(); 7106 7107 // C++ [except.spec]p14: 7108 // An implicitly declared special member function (Clause 12) shall have 7109 // an exception-specification. 7110 ImplicitExceptionSpecification ExceptSpec(*this); 7111 if (ClassDecl->isInvalidDecl()) 7112 return ExceptSpec; 7113 7114 // Direct base-class destructors. 7115 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 7116 BEnd = ClassDecl->bases_end(); 7117 B != BEnd; ++B) { 7118 if (B->isVirtual()) // Handled below. 7119 continue; 7120 7121 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 7122 ExceptSpec.CalledDecl(B->getLocStart(), 7123 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 7124 } 7125 7126 // Virtual base-class destructors. 7127 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 7128 BEnd = ClassDecl->vbases_end(); 7129 B != BEnd; ++B) { 7130 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 7131 ExceptSpec.CalledDecl(B->getLocStart(), 7132 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 7133 } 7134 7135 // Field destructors. 7136 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 7137 FEnd = ClassDecl->field_end(); 7138 F != FEnd; ++F) { 7139 if (const RecordType *RecordTy 7140 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 7141 ExceptSpec.CalledDecl(F->getLocation(), 7142 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl()))); 7143 } 7144 7145 return ExceptSpec; 7146} 7147 7148CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { 7149 // C++ [class.dtor]p2: 7150 // If a class has no user-declared destructor, a destructor is 7151 // declared implicitly. An implicitly-declared destructor is an 7152 // inline public member of its class. 7153 7154 // Create the actual destructor declaration. 7155 CanQualType ClassType 7156 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 7157 SourceLocation ClassLoc = ClassDecl->getLocation(); 7158 DeclarationName Name 7159 = Context.DeclarationNames.getCXXDestructorName(ClassType); 7160 DeclarationNameInfo NameInfo(Name, ClassLoc); 7161 CXXDestructorDecl *Destructor 7162 = CXXDestructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 7163 QualType(), 0, /*isInline=*/true, 7164 /*isImplicitlyDeclared=*/true); 7165 Destructor->setAccess(AS_public); 7166 Destructor->setDefaulted(); 7167 Destructor->setImplicit(); 7168 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 7169 7170 // Build an exception specification pointing back at this destructor. 7171 FunctionProtoType::ExtProtoInfo EPI; 7172 EPI.ExceptionSpecType = EST_Unevaluated; 7173 EPI.ExceptionSpecDecl = Destructor; 7174 Destructor->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 7175 7176 // Note that we have declared this destructor. 7177 ++ASTContext::NumImplicitDestructorsDeclared; 7178 7179 // Introduce this destructor into its scope. 7180 if (Scope *S = getScopeForContext(ClassDecl)) 7181 PushOnScopeChains(Destructor, S, false); 7182 ClassDecl->addDecl(Destructor); 7183 7184 AddOverriddenMethods(ClassDecl, Destructor); 7185 7186 if (ShouldDeleteSpecialMember(Destructor, CXXDestructor)) 7187 Destructor->setDeletedAsWritten(); 7188 7189 return Destructor; 7190} 7191 7192void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 7193 CXXDestructorDecl *Destructor) { 7194 assert((Destructor->isDefaulted() && 7195 !Destructor->doesThisDeclarationHaveABody() && 7196 !Destructor->isDeleted()) && 7197 "DefineImplicitDestructor - call it for implicit default dtor"); 7198 CXXRecordDecl *ClassDecl = Destructor->getParent(); 7199 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 7200 7201 if (Destructor->isInvalidDecl()) 7202 return; 7203 7204 ImplicitlyDefinedFunctionScope Scope(*this, Destructor); 7205 7206 DiagnosticErrorTrap Trap(Diags); 7207 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 7208 Destructor->getParent()); 7209 7210 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 7211 Diag(CurrentLocation, diag::note_member_synthesized_at) 7212 << CXXDestructor << Context.getTagDeclType(ClassDecl); 7213 7214 Destructor->setInvalidDecl(); 7215 return; 7216 } 7217 7218 SourceLocation Loc = Destructor->getLocation(); 7219 Destructor->setBody(new (Context) CompoundStmt(Loc)); 7220 Destructor->setImplicitlyDefined(true); 7221 Destructor->setUsed(); 7222 MarkVTableUsed(CurrentLocation, ClassDecl); 7223 7224 if (ASTMutationListener *L = getASTMutationListener()) { 7225 L->CompletedImplicitDefinition(Destructor); 7226 } 7227} 7228 7229/// \brief Perform any semantic analysis which needs to be delayed until all 7230/// pending class member declarations have been parsed. 7231void Sema::ActOnFinishCXXMemberDecls() { 7232 // Perform any deferred checking of exception specifications for virtual 7233 // destructors. 7234 for (unsigned i = 0, e = DelayedDestructorExceptionSpecChecks.size(); 7235 i != e; ++i) { 7236 const CXXDestructorDecl *Dtor = 7237 DelayedDestructorExceptionSpecChecks[i].first; 7238 assert(!Dtor->getParent()->isDependentType() && 7239 "Should not ever add destructors of templates into the list."); 7240 CheckOverridingFunctionExceptionSpec(Dtor, 7241 DelayedDestructorExceptionSpecChecks[i].second); 7242 } 7243 DelayedDestructorExceptionSpecChecks.clear(); 7244} 7245 7246void Sema::AdjustDestructorExceptionSpec(CXXRecordDecl *ClassDecl, 7247 CXXDestructorDecl *Destructor) { 7248 assert(getLangOpts().CPlusPlus0x && 7249 "adjusting dtor exception specs was introduced in c++11"); 7250 7251 // C++11 [class.dtor]p3: 7252 // A declaration of a destructor that does not have an exception- 7253 // specification is implicitly considered to have the same exception- 7254 // specification as an implicit declaration. 7255 const FunctionProtoType *DtorType = Destructor->getType()-> 7256 getAs<FunctionProtoType>(); 7257 if (DtorType->hasExceptionSpec()) 7258 return; 7259 7260 // Replace the destructor's type, building off the existing one. Fortunately, 7261 // the only thing of interest in the destructor type is its extended info. 7262 // The return and arguments are fixed. 7263 FunctionProtoType::ExtProtoInfo EPI = DtorType->getExtProtoInfo(); 7264 EPI.ExceptionSpecType = EST_Unevaluated; 7265 EPI.ExceptionSpecDecl = Destructor; 7266 Destructor->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 7267 7268 // FIXME: If the destructor has a body that could throw, and the newly created 7269 // spec doesn't allow exceptions, we should emit a warning, because this 7270 // change in behavior can break conforming C++03 programs at runtime. 7271 // However, we don't have a body or an exception specification yet, so it 7272 // needs to be done somewhere else. 7273} 7274 7275/// \brief Builds a statement that copies/moves the given entity from \p From to 7276/// \c To. 7277/// 7278/// This routine is used to copy/move the members of a class with an 7279/// implicitly-declared copy/move assignment operator. When the entities being 7280/// copied are arrays, this routine builds for loops to copy them. 7281/// 7282/// \param S The Sema object used for type-checking. 7283/// 7284/// \param Loc The location where the implicit copy/move is being generated. 7285/// 7286/// \param T The type of the expressions being copied/moved. Both expressions 7287/// must have this type. 7288/// 7289/// \param To The expression we are copying/moving to. 7290/// 7291/// \param From The expression we are copying/moving from. 7292/// 7293/// \param CopyingBaseSubobject Whether we're copying/moving a base subobject. 7294/// Otherwise, it's a non-static member subobject. 7295/// 7296/// \param Copying Whether we're copying or moving. 7297/// 7298/// \param Depth Internal parameter recording the depth of the recursion. 7299/// 7300/// \returns A statement or a loop that copies the expressions. 7301static StmtResult 7302BuildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 7303 Expr *To, Expr *From, 7304 bool CopyingBaseSubobject, bool Copying, 7305 unsigned Depth = 0) { 7306 // C++0x [class.copy]p28: 7307 // Each subobject is assigned in the manner appropriate to its type: 7308 // 7309 // - if the subobject is of class type, as if by a call to operator= with 7310 // the subobject as the object expression and the corresponding 7311 // subobject of x as a single function argument (as if by explicit 7312 // qualification; that is, ignoring any possible virtual overriding 7313 // functions in more derived classes); 7314 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 7315 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 7316 7317 // Look for operator=. 7318 DeclarationName Name 7319 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 7320 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 7321 S.LookupQualifiedName(OpLookup, ClassDecl, false); 7322 7323 // Filter out any result that isn't a copy/move-assignment operator. 7324 LookupResult::Filter F = OpLookup.makeFilter(); 7325 while (F.hasNext()) { 7326 NamedDecl *D = F.next(); 7327 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 7328 if (Method->isCopyAssignmentOperator() || 7329 (!Copying && Method->isMoveAssignmentOperator())) 7330 continue; 7331 7332 F.erase(); 7333 } 7334 F.done(); 7335 7336 // Suppress the protected check (C++ [class.protected]) for each of the 7337 // assignment operators we found. This strange dance is required when 7338 // we're assigning via a base classes's copy-assignment operator. To 7339 // ensure that we're getting the right base class subobject (without 7340 // ambiguities), we need to cast "this" to that subobject type; to 7341 // ensure that we don't go through the virtual call mechanism, we need 7342 // to qualify the operator= name with the base class (see below). However, 7343 // this means that if the base class has a protected copy assignment 7344 // operator, the protected member access check will fail. So, we 7345 // rewrite "protected" access to "public" access in this case, since we 7346 // know by construction that we're calling from a derived class. 7347 if (CopyingBaseSubobject) { 7348 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 7349 L != LEnd; ++L) { 7350 if (L.getAccess() == AS_protected) 7351 L.setAccess(AS_public); 7352 } 7353 } 7354 7355 // Create the nested-name-specifier that will be used to qualify the 7356 // reference to operator=; this is required to suppress the virtual 7357 // call mechanism. 7358 CXXScopeSpec SS; 7359 const Type *CanonicalT = S.Context.getCanonicalType(T.getTypePtr()); 7360 SS.MakeTrivial(S.Context, 7361 NestedNameSpecifier::Create(S.Context, 0, false, 7362 CanonicalT), 7363 Loc); 7364 7365 // Create the reference to operator=. 7366 ExprResult OpEqualRef 7367 = S.BuildMemberReferenceExpr(To, T, Loc, /*isArrow=*/false, SS, 7368 /*TemplateKWLoc=*/SourceLocation(), 7369 /*FirstQualifierInScope=*/0, 7370 OpLookup, 7371 /*TemplateArgs=*/0, 7372 /*SuppressQualifierCheck=*/true); 7373 if (OpEqualRef.isInvalid()) 7374 return StmtError(); 7375 7376 // Build the call to the assignment operator. 7377 7378 ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 7379 OpEqualRef.takeAs<Expr>(), 7380 Loc, &From, 1, Loc); 7381 if (Call.isInvalid()) 7382 return StmtError(); 7383 7384 return S.Owned(Call.takeAs<Stmt>()); 7385 } 7386 7387 // - if the subobject is of scalar type, the built-in assignment 7388 // operator is used. 7389 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 7390 if (!ArrayTy) { 7391 ExprResult Assignment = S.CreateBuiltinBinOp(Loc, BO_Assign, To, From); 7392 if (Assignment.isInvalid()) 7393 return StmtError(); 7394 7395 return S.Owned(Assignment.takeAs<Stmt>()); 7396 } 7397 7398 // - if the subobject is an array, each element is assigned, in the 7399 // manner appropriate to the element type; 7400 7401 // Construct a loop over the array bounds, e.g., 7402 // 7403 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 7404 // 7405 // that will copy each of the array elements. 7406 QualType SizeType = S.Context.getSizeType(); 7407 7408 // Create the iteration variable. 7409 IdentifierInfo *IterationVarName = 0; 7410 { 7411 SmallString<8> Str; 7412 llvm::raw_svector_ostream OS(Str); 7413 OS << "__i" << Depth; 7414 IterationVarName = &S.Context.Idents.get(OS.str()); 7415 } 7416 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, Loc, 7417 IterationVarName, SizeType, 7418 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 7419 SC_None, SC_None); 7420 7421 // Initialize the iteration variable to zero. 7422 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 7423 IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc)); 7424 7425 // Create a reference to the iteration variable; we'll use this several 7426 // times throughout. 7427 Expr *IterationVarRef 7428 = S.BuildDeclRefExpr(IterationVar, SizeType, VK_LValue, Loc).take(); 7429 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 7430 Expr *IterationVarRefRVal = S.DefaultLvalueConversion(IterationVarRef).take(); 7431 assert(IterationVarRefRVal && "Conversion of invented variable cannot fail!"); 7432 7433 // Create the DeclStmt that holds the iteration variable. 7434 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 7435 7436 // Create the comparison against the array bound. 7437 llvm::APInt Upper 7438 = ArrayTy->getSize().zextOrTrunc(S.Context.getTypeSize(SizeType)); 7439 Expr *Comparison 7440 = new (S.Context) BinaryOperator(IterationVarRefRVal, 7441 IntegerLiteral::Create(S.Context, Upper, SizeType, Loc), 7442 BO_NE, S.Context.BoolTy, 7443 VK_RValue, OK_Ordinary, Loc); 7444 7445 // Create the pre-increment of the iteration variable. 7446 Expr *Increment 7447 = new (S.Context) UnaryOperator(IterationVarRef, UO_PreInc, SizeType, 7448 VK_LValue, OK_Ordinary, Loc); 7449 7450 // Subscript the "from" and "to" expressions with the iteration variable. 7451 From = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(From, Loc, 7452 IterationVarRefRVal, 7453 Loc)); 7454 To = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(To, Loc, 7455 IterationVarRefRVal, 7456 Loc)); 7457 if (!Copying) // Cast to rvalue 7458 From = CastForMoving(S, From); 7459 7460 // Build the copy/move for an individual element of the array. 7461 StmtResult Copy = BuildSingleCopyAssign(S, Loc, ArrayTy->getElementType(), 7462 To, From, CopyingBaseSubobject, 7463 Copying, Depth + 1); 7464 if (Copy.isInvalid()) 7465 return StmtError(); 7466 7467 // Construct the loop that copies all elements of this array. 7468 return S.ActOnForStmt(Loc, Loc, InitStmt, 7469 S.MakeFullExpr(Comparison), 7470 0, S.MakeFullExpr(Increment), 7471 Loc, Copy.take()); 7472} 7473 7474/// Determine whether an implicit copy assignment operator for ClassDecl has a 7475/// const argument. 7476/// FIXME: It ought to be possible to store this on the record. 7477static bool isImplicitCopyAssignmentArgConst(Sema &S, 7478 CXXRecordDecl *ClassDecl) { 7479 if (ClassDecl->isInvalidDecl()) 7480 return true; 7481 7482 // C++ [class.copy]p10: 7483 // If the class definition does not explicitly declare a copy 7484 // assignment operator, one is declared implicitly. 7485 // The implicitly-defined copy assignment operator for a class X 7486 // will have the form 7487 // 7488 // X& X::operator=(const X&) 7489 // 7490 // if 7491 // -- each direct base class B of X has a copy assignment operator 7492 // whose parameter is of type const B&, const volatile B& or B, 7493 // and 7494 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7495 BaseEnd = ClassDecl->bases_end(); 7496 Base != BaseEnd; ++Base) { 7497 // We'll handle this below 7498 if (S.getLangOpts().CPlusPlus0x && Base->isVirtual()) 7499 continue; 7500 7501 assert(!Base->getType()->isDependentType() && 7502 "Cannot generate implicit members for class with dependent bases."); 7503 CXXRecordDecl *BaseClassDecl = Base->getType()->getAsCXXRecordDecl(); 7504 if (!S.LookupCopyingAssignment(BaseClassDecl, Qualifiers::Const, false, 0)) 7505 return false; 7506 } 7507 7508 // In C++11, the above citation has "or virtual" added 7509 if (S.getLangOpts().CPlusPlus0x) { 7510 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7511 BaseEnd = ClassDecl->vbases_end(); 7512 Base != BaseEnd; ++Base) { 7513 assert(!Base->getType()->isDependentType() && 7514 "Cannot generate implicit members for class with dependent bases."); 7515 CXXRecordDecl *BaseClassDecl = Base->getType()->getAsCXXRecordDecl(); 7516 if (!S.LookupCopyingAssignment(BaseClassDecl, Qualifiers::Const, 7517 false, 0)) 7518 return false; 7519 } 7520 } 7521 7522 // -- for all the nonstatic data members of X that are of a class 7523 // type M (or array thereof), each such class type has a copy 7524 // assignment operator whose parameter is of type const M&, 7525 // const volatile M& or M. 7526 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7527 FieldEnd = ClassDecl->field_end(); 7528 Field != FieldEnd; ++Field) { 7529 QualType FieldType = S.Context.getBaseElementType(Field->getType()); 7530 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) 7531 if (!S.LookupCopyingAssignment(FieldClassDecl, Qualifiers::Const, 7532 false, 0)) 7533 return false; 7534 } 7535 7536 // Otherwise, the implicitly declared copy assignment operator will 7537 // have the form 7538 // 7539 // X& X::operator=(X&) 7540 7541 return true; 7542} 7543 7544Sema::ImplicitExceptionSpecification 7545Sema::ComputeDefaultedCopyAssignmentExceptionSpec(CXXMethodDecl *MD) { 7546 CXXRecordDecl *ClassDecl = MD->getParent(); 7547 7548 ImplicitExceptionSpecification ExceptSpec(*this); 7549 if (ClassDecl->isInvalidDecl()) 7550 return ExceptSpec; 7551 7552 const FunctionProtoType *T = MD->getType()->castAs<FunctionProtoType>(); 7553 assert(T->getNumArgs() == 1 && "not a copy assignment op"); 7554 unsigned ArgQuals = T->getArgType(0).getNonReferenceType().getCVRQualifiers(); 7555 7556 // C++ [except.spec]p14: 7557 // An implicitly declared special member function (Clause 12) shall have an 7558 // exception-specification. [...] 7559 7560 // It is unspecified whether or not an implicit copy assignment operator 7561 // attempts to deduplicate calls to assignment operators of virtual bases are 7562 // made. As such, this exception specification is effectively unspecified. 7563 // Based on a similar decision made for constness in C++0x, we're erring on 7564 // the side of assuming such calls to be made regardless of whether they 7565 // actually happen. 7566 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7567 BaseEnd = ClassDecl->bases_end(); 7568 Base != BaseEnd; ++Base) { 7569 if (Base->isVirtual()) 7570 continue; 7571 7572 CXXRecordDecl *BaseClassDecl 7573 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7574 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 7575 ArgQuals, false, 0)) 7576 ExceptSpec.CalledDecl(Base->getLocStart(), CopyAssign); 7577 } 7578 7579 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7580 BaseEnd = ClassDecl->vbases_end(); 7581 Base != BaseEnd; ++Base) { 7582 CXXRecordDecl *BaseClassDecl 7583 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7584 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 7585 ArgQuals, false, 0)) 7586 ExceptSpec.CalledDecl(Base->getLocStart(), CopyAssign); 7587 } 7588 7589 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7590 FieldEnd = ClassDecl->field_end(); 7591 Field != FieldEnd; 7592 ++Field) { 7593 QualType FieldType = Context.getBaseElementType(Field->getType()); 7594 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7595 if (CXXMethodDecl *CopyAssign = 7596 LookupCopyingAssignment(FieldClassDecl, 7597 ArgQuals | FieldType.getCVRQualifiers(), 7598 false, 0)) 7599 ExceptSpec.CalledDecl(Field->getLocation(), CopyAssign); 7600 } 7601 } 7602 7603 return ExceptSpec; 7604} 7605 7606CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 7607 // Note: The following rules are largely analoguous to the copy 7608 // constructor rules. Note that virtual bases are not taken into account 7609 // for determining the argument type of the operator. Note also that 7610 // operators taking an object instead of a reference are allowed. 7611 7612 QualType ArgType = Context.getTypeDeclType(ClassDecl); 7613 QualType RetType = Context.getLValueReferenceType(ArgType); 7614 if (isImplicitCopyAssignmentArgConst(*this, ClassDecl)) 7615 ArgType = ArgType.withConst(); 7616 ArgType = Context.getLValueReferenceType(ArgType); 7617 7618 // An implicitly-declared copy assignment operator is an inline public 7619 // member of its class. 7620 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 7621 SourceLocation ClassLoc = ClassDecl->getLocation(); 7622 DeclarationNameInfo NameInfo(Name, ClassLoc); 7623 CXXMethodDecl *CopyAssignment 7624 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, QualType(), 7625 /*TInfo=*/0, /*isStatic=*/false, 7626 /*StorageClassAsWritten=*/SC_None, 7627 /*isInline=*/true, /*isConstexpr=*/false, 7628 SourceLocation()); 7629 CopyAssignment->setAccess(AS_public); 7630 CopyAssignment->setDefaulted(); 7631 CopyAssignment->setImplicit(); 7632 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 7633 7634 // Build an exception specification pointing back at this member. 7635 FunctionProtoType::ExtProtoInfo EPI; 7636 EPI.ExceptionSpecType = EST_Unevaluated; 7637 EPI.ExceptionSpecDecl = CopyAssignment; 7638 CopyAssignment->setType(Context.getFunctionType(RetType, &ArgType, 1, EPI)); 7639 7640 // Add the parameter to the operator. 7641 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 7642 ClassLoc, ClassLoc, /*Id=*/0, 7643 ArgType, /*TInfo=*/0, 7644 SC_None, 7645 SC_None, 0); 7646 CopyAssignment->setParams(FromParam); 7647 7648 // Note that we have added this copy-assignment operator. 7649 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 7650 7651 if (Scope *S = getScopeForContext(ClassDecl)) 7652 PushOnScopeChains(CopyAssignment, S, false); 7653 ClassDecl->addDecl(CopyAssignment); 7654 7655 // C++0x [class.copy]p19: 7656 // .... If the class definition does not explicitly declare a copy 7657 // assignment operator, there is no user-declared move constructor, and 7658 // there is no user-declared move assignment operator, a copy assignment 7659 // operator is implicitly declared as defaulted. 7660 if (ShouldDeleteSpecialMember(CopyAssignment, CXXCopyAssignment)) 7661 CopyAssignment->setDeletedAsWritten(); 7662 7663 AddOverriddenMethods(ClassDecl, CopyAssignment); 7664 return CopyAssignment; 7665} 7666 7667void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 7668 CXXMethodDecl *CopyAssignOperator) { 7669 assert((CopyAssignOperator->isDefaulted() && 7670 CopyAssignOperator->isOverloadedOperator() && 7671 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 7672 !CopyAssignOperator->doesThisDeclarationHaveABody() && 7673 !CopyAssignOperator->isDeleted()) && 7674 "DefineImplicitCopyAssignment called for wrong function"); 7675 7676 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 7677 7678 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 7679 CopyAssignOperator->setInvalidDecl(); 7680 return; 7681 } 7682 7683 CopyAssignOperator->setUsed(); 7684 7685 ImplicitlyDefinedFunctionScope Scope(*this, CopyAssignOperator); 7686 DiagnosticErrorTrap Trap(Diags); 7687 7688 // C++0x [class.copy]p30: 7689 // The implicitly-defined or explicitly-defaulted copy assignment operator 7690 // for a non-union class X performs memberwise copy assignment of its 7691 // subobjects. The direct base classes of X are assigned first, in the 7692 // order of their declaration in the base-specifier-list, and then the 7693 // immediate non-static data members of X are assigned, in the order in 7694 // which they were declared in the class definition. 7695 7696 // The statements that form the synthesized function body. 7697 SmallVector<Stmt*, 8> Statements; 7698 7699 // The parameter for the "other" object, which we are copying from. 7700 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 7701 Qualifiers OtherQuals = Other->getType().getQualifiers(); 7702 QualType OtherRefType = Other->getType(); 7703 if (const LValueReferenceType *OtherRef 7704 = OtherRefType->getAs<LValueReferenceType>()) { 7705 OtherRefType = OtherRef->getPointeeType(); 7706 OtherQuals = OtherRefType.getQualifiers(); 7707 } 7708 7709 // Our location for everything implicitly-generated. 7710 SourceLocation Loc = CopyAssignOperator->getLocation(); 7711 7712 // Construct a reference to the "other" object. We'll be using this 7713 // throughout the generated ASTs. 7714 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 7715 assert(OtherRef && "Reference to parameter cannot fail!"); 7716 7717 // Construct the "this" pointer. We'll be using this throughout the generated 7718 // ASTs. 7719 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 7720 assert(This && "Reference to this cannot fail!"); 7721 7722 // Assign base classes. 7723 bool Invalid = false; 7724 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7725 E = ClassDecl->bases_end(); Base != E; ++Base) { 7726 // Form the assignment: 7727 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 7728 QualType BaseType = Base->getType().getUnqualifiedType(); 7729 if (!BaseType->isRecordType()) { 7730 Invalid = true; 7731 continue; 7732 } 7733 7734 CXXCastPath BasePath; 7735 BasePath.push_back(Base); 7736 7737 // Construct the "from" expression, which is an implicit cast to the 7738 // appropriately-qualified base type. 7739 Expr *From = OtherRef; 7740 From = ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 7741 CK_UncheckedDerivedToBase, 7742 VK_LValue, &BasePath).take(); 7743 7744 // Dereference "this". 7745 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 7746 7747 // Implicitly cast "this" to the appropriately-qualified base type. 7748 To = ImpCastExprToType(To.take(), 7749 Context.getCVRQualifiedType(BaseType, 7750 CopyAssignOperator->getTypeQualifiers()), 7751 CK_UncheckedDerivedToBase, 7752 VK_LValue, &BasePath); 7753 7754 // Build the copy. 7755 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, BaseType, 7756 To.get(), From, 7757 /*CopyingBaseSubobject=*/true, 7758 /*Copying=*/true); 7759 if (Copy.isInvalid()) { 7760 Diag(CurrentLocation, diag::note_member_synthesized_at) 7761 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7762 CopyAssignOperator->setInvalidDecl(); 7763 return; 7764 } 7765 7766 // Success! Record the copy. 7767 Statements.push_back(Copy.takeAs<Expr>()); 7768 } 7769 7770 // \brief Reference to the __builtin_memcpy function. 7771 Expr *BuiltinMemCpyRef = 0; 7772 // \brief Reference to the __builtin_objc_memmove_collectable function. 7773 Expr *CollectableMemCpyRef = 0; 7774 7775 // Assign non-static members. 7776 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7777 FieldEnd = ClassDecl->field_end(); 7778 Field != FieldEnd; ++Field) { 7779 if (Field->isUnnamedBitfield()) 7780 continue; 7781 7782 // Check for members of reference type; we can't copy those. 7783 if (Field->getType()->isReferenceType()) { 7784 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 7785 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 7786 Diag(Field->getLocation(), diag::note_declared_at); 7787 Diag(CurrentLocation, diag::note_member_synthesized_at) 7788 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7789 Invalid = true; 7790 continue; 7791 } 7792 7793 // Check for members of const-qualified, non-class type. 7794 QualType BaseType = Context.getBaseElementType(Field->getType()); 7795 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 7796 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 7797 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 7798 Diag(Field->getLocation(), diag::note_declared_at); 7799 Diag(CurrentLocation, diag::note_member_synthesized_at) 7800 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7801 Invalid = true; 7802 continue; 7803 } 7804 7805 // Suppress assigning zero-width bitfields. 7806 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0) 7807 continue; 7808 7809 QualType FieldType = Field->getType().getNonReferenceType(); 7810 if (FieldType->isIncompleteArrayType()) { 7811 assert(ClassDecl->hasFlexibleArrayMember() && 7812 "Incomplete array type is not valid"); 7813 continue; 7814 } 7815 7816 // Build references to the field in the object we're copying from and to. 7817 CXXScopeSpec SS; // Intentionally empty 7818 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 7819 LookupMemberName); 7820 MemberLookup.addDecl(*Field); 7821 MemberLookup.resolveKind(); 7822 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 7823 Loc, /*IsArrow=*/false, 7824 SS, SourceLocation(), 0, 7825 MemberLookup, 0); 7826 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 7827 Loc, /*IsArrow=*/true, 7828 SS, SourceLocation(), 0, 7829 MemberLookup, 0); 7830 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 7831 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 7832 7833 // If the field should be copied with __builtin_memcpy rather than via 7834 // explicit assignments, do so. This optimization only applies for arrays 7835 // of scalars and arrays of class type with trivial copy-assignment 7836 // operators. 7837 if (FieldType->isArrayType() && !FieldType.isVolatileQualified() 7838 && BaseType.hasTrivialAssignment(Context, /*Copying=*/true)) { 7839 // Compute the size of the memory buffer to be copied. 7840 QualType SizeType = Context.getSizeType(); 7841 llvm::APInt Size(Context.getTypeSize(SizeType), 7842 Context.getTypeSizeInChars(BaseType).getQuantity()); 7843 for (const ConstantArrayType *Array 7844 = Context.getAsConstantArrayType(FieldType); 7845 Array; 7846 Array = Context.getAsConstantArrayType(Array->getElementType())) { 7847 llvm::APInt ArraySize 7848 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 7849 Size *= ArraySize; 7850 } 7851 7852 // Take the address of the field references for "from" and "to". 7853 From = CreateBuiltinUnaryOp(Loc, UO_AddrOf, From.get()); 7854 To = CreateBuiltinUnaryOp(Loc, UO_AddrOf, To.get()); 7855 7856 bool NeedsCollectableMemCpy = 7857 (BaseType->isRecordType() && 7858 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 7859 7860 if (NeedsCollectableMemCpy) { 7861 if (!CollectableMemCpyRef) { 7862 // Create a reference to the __builtin_objc_memmove_collectable function. 7863 LookupResult R(*this, 7864 &Context.Idents.get("__builtin_objc_memmove_collectable"), 7865 Loc, LookupOrdinaryName); 7866 LookupName(R, TUScope, true); 7867 7868 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 7869 if (!CollectableMemCpy) { 7870 // Something went horribly wrong earlier, and we will have 7871 // complained about it. 7872 Invalid = true; 7873 continue; 7874 } 7875 7876 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 7877 Context.BuiltinFnTy, 7878 VK_RValue, Loc, 0).take(); 7879 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 7880 } 7881 } 7882 // Create a reference to the __builtin_memcpy builtin function. 7883 else if (!BuiltinMemCpyRef) { 7884 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 7885 LookupOrdinaryName); 7886 LookupName(R, TUScope, true); 7887 7888 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 7889 if (!BuiltinMemCpy) { 7890 // Something went horribly wrong earlier, and we will have complained 7891 // about it. 7892 Invalid = true; 7893 continue; 7894 } 7895 7896 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 7897 Context.BuiltinFnTy, 7898 VK_RValue, Loc, 0).take(); 7899 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 7900 } 7901 7902 SmallVector<Expr*, 8> CallArgs; 7903 CallArgs.push_back(To.takeAs<Expr>()); 7904 CallArgs.push_back(From.takeAs<Expr>()); 7905 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 7906 ExprResult Call = ExprError(); 7907 if (NeedsCollectableMemCpy) 7908 Call = ActOnCallExpr(/*Scope=*/0, 7909 CollectableMemCpyRef, 7910 Loc, CallArgs, 7911 Loc); 7912 else 7913 Call = ActOnCallExpr(/*Scope=*/0, 7914 BuiltinMemCpyRef, 7915 Loc, CallArgs, 7916 Loc); 7917 7918 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 7919 Statements.push_back(Call.takeAs<Expr>()); 7920 continue; 7921 } 7922 7923 // Build the copy of this field. 7924 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, FieldType, 7925 To.get(), From.get(), 7926 /*CopyingBaseSubobject=*/false, 7927 /*Copying=*/true); 7928 if (Copy.isInvalid()) { 7929 Diag(CurrentLocation, diag::note_member_synthesized_at) 7930 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7931 CopyAssignOperator->setInvalidDecl(); 7932 return; 7933 } 7934 7935 // Success! Record the copy. 7936 Statements.push_back(Copy.takeAs<Stmt>()); 7937 } 7938 7939 if (!Invalid) { 7940 // Add a "return *this;" 7941 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 7942 7943 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 7944 if (Return.isInvalid()) 7945 Invalid = true; 7946 else { 7947 Statements.push_back(Return.takeAs<Stmt>()); 7948 7949 if (Trap.hasErrorOccurred()) { 7950 Diag(CurrentLocation, diag::note_member_synthesized_at) 7951 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7952 Invalid = true; 7953 } 7954 } 7955 } 7956 7957 if (Invalid) { 7958 CopyAssignOperator->setInvalidDecl(); 7959 return; 7960 } 7961 7962 StmtResult Body; 7963 { 7964 CompoundScopeRAII CompoundScope(*this); 7965 Body = ActOnCompoundStmt(Loc, Loc, Statements, 7966 /*isStmtExpr=*/false); 7967 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 7968 } 7969 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 7970 7971 if (ASTMutationListener *L = getASTMutationListener()) { 7972 L->CompletedImplicitDefinition(CopyAssignOperator); 7973 } 7974} 7975 7976Sema::ImplicitExceptionSpecification 7977Sema::ComputeDefaultedMoveAssignmentExceptionSpec(CXXMethodDecl *MD) { 7978 CXXRecordDecl *ClassDecl = MD->getParent(); 7979 7980 ImplicitExceptionSpecification ExceptSpec(*this); 7981 if (ClassDecl->isInvalidDecl()) 7982 return ExceptSpec; 7983 7984 // C++0x [except.spec]p14: 7985 // An implicitly declared special member function (Clause 12) shall have an 7986 // exception-specification. [...] 7987 7988 // It is unspecified whether or not an implicit move assignment operator 7989 // attempts to deduplicate calls to assignment operators of virtual bases are 7990 // made. As such, this exception specification is effectively unspecified. 7991 // Based on a similar decision made for constness in C++0x, we're erring on 7992 // the side of assuming such calls to be made regardless of whether they 7993 // actually happen. 7994 // Note that a move constructor is not implicitly declared when there are 7995 // virtual bases, but it can still be user-declared and explicitly defaulted. 7996 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7997 BaseEnd = ClassDecl->bases_end(); 7998 Base != BaseEnd; ++Base) { 7999 if (Base->isVirtual()) 8000 continue; 8001 8002 CXXRecordDecl *BaseClassDecl 8003 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8004 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 8005 0, false, 0)) 8006 ExceptSpec.CalledDecl(Base->getLocStart(), MoveAssign); 8007 } 8008 8009 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8010 BaseEnd = ClassDecl->vbases_end(); 8011 Base != BaseEnd; ++Base) { 8012 CXXRecordDecl *BaseClassDecl 8013 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8014 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 8015 0, false, 0)) 8016 ExceptSpec.CalledDecl(Base->getLocStart(), MoveAssign); 8017 } 8018 8019 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8020 FieldEnd = ClassDecl->field_end(); 8021 Field != FieldEnd; 8022 ++Field) { 8023 QualType FieldType = Context.getBaseElementType(Field->getType()); 8024 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8025 if (CXXMethodDecl *MoveAssign = 8026 LookupMovingAssignment(FieldClassDecl, 8027 FieldType.getCVRQualifiers(), 8028 false, 0)) 8029 ExceptSpec.CalledDecl(Field->getLocation(), MoveAssign); 8030 } 8031 } 8032 8033 return ExceptSpec; 8034} 8035 8036/// Determine whether the class type has any direct or indirect virtual base 8037/// classes which have a non-trivial move assignment operator. 8038static bool 8039hasVirtualBaseWithNonTrivialMoveAssignment(Sema &S, CXXRecordDecl *ClassDecl) { 8040 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8041 BaseEnd = ClassDecl->vbases_end(); 8042 Base != BaseEnd; ++Base) { 8043 CXXRecordDecl *BaseClass = 8044 cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8045 8046 // Try to declare the move assignment. If it would be deleted, then the 8047 // class does not have a non-trivial move assignment. 8048 if (BaseClass->needsImplicitMoveAssignment()) 8049 S.DeclareImplicitMoveAssignment(BaseClass); 8050 8051 // If the class has both a trivial move assignment and a non-trivial move 8052 // assignment, hasTrivialMoveAssignment() is false. 8053 if (BaseClass->hasDeclaredMoveAssignment() && 8054 !BaseClass->hasTrivialMoveAssignment()) 8055 return true; 8056 } 8057 8058 return false; 8059} 8060 8061/// Determine whether the given type either has a move constructor or is 8062/// trivially copyable. 8063static bool 8064hasMoveOrIsTriviallyCopyable(Sema &S, QualType Type, bool IsConstructor) { 8065 Type = S.Context.getBaseElementType(Type); 8066 8067 // FIXME: Technically, non-trivially-copyable non-class types, such as 8068 // reference types, are supposed to return false here, but that appears 8069 // to be a standard defect. 8070 CXXRecordDecl *ClassDecl = Type->getAsCXXRecordDecl(); 8071 if (!ClassDecl || !ClassDecl->getDefinition()) 8072 return true; 8073 8074 if (Type.isTriviallyCopyableType(S.Context)) 8075 return true; 8076 8077 if (IsConstructor) { 8078 if (ClassDecl->needsImplicitMoveConstructor()) 8079 S.DeclareImplicitMoveConstructor(ClassDecl); 8080 return ClassDecl->hasDeclaredMoveConstructor(); 8081 } 8082 8083 if (ClassDecl->needsImplicitMoveAssignment()) 8084 S.DeclareImplicitMoveAssignment(ClassDecl); 8085 return ClassDecl->hasDeclaredMoveAssignment(); 8086} 8087 8088/// Determine whether all non-static data members and direct or virtual bases 8089/// of class \p ClassDecl have either a move operation, or are trivially 8090/// copyable. 8091static bool subobjectsHaveMoveOrTrivialCopy(Sema &S, CXXRecordDecl *ClassDecl, 8092 bool IsConstructor) { 8093 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8094 BaseEnd = ClassDecl->bases_end(); 8095 Base != BaseEnd; ++Base) { 8096 if (Base->isVirtual()) 8097 continue; 8098 8099 if (!hasMoveOrIsTriviallyCopyable(S, Base->getType(), IsConstructor)) 8100 return false; 8101 } 8102 8103 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8104 BaseEnd = ClassDecl->vbases_end(); 8105 Base != BaseEnd; ++Base) { 8106 if (!hasMoveOrIsTriviallyCopyable(S, Base->getType(), IsConstructor)) 8107 return false; 8108 } 8109 8110 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8111 FieldEnd = ClassDecl->field_end(); 8112 Field != FieldEnd; ++Field) { 8113 if (!hasMoveOrIsTriviallyCopyable(S, Field->getType(), IsConstructor)) 8114 return false; 8115 } 8116 8117 return true; 8118} 8119 8120CXXMethodDecl *Sema::DeclareImplicitMoveAssignment(CXXRecordDecl *ClassDecl) { 8121 // C++11 [class.copy]p20: 8122 // If the definition of a class X does not explicitly declare a move 8123 // assignment operator, one will be implicitly declared as defaulted 8124 // if and only if: 8125 // 8126 // - [first 4 bullets] 8127 assert(ClassDecl->needsImplicitMoveAssignment()); 8128 8129 // [Checked after we build the declaration] 8130 // - the move assignment operator would not be implicitly defined as 8131 // deleted, 8132 8133 // [DR1402]: 8134 // - X has no direct or indirect virtual base class with a non-trivial 8135 // move assignment operator, and 8136 // - each of X's non-static data members and direct or virtual base classes 8137 // has a type that either has a move assignment operator or is trivially 8138 // copyable. 8139 if (hasVirtualBaseWithNonTrivialMoveAssignment(*this, ClassDecl) || 8140 !subobjectsHaveMoveOrTrivialCopy(*this, ClassDecl,/*Constructor*/false)) { 8141 ClassDecl->setFailedImplicitMoveAssignment(); 8142 return 0; 8143 } 8144 8145 // Note: The following rules are largely analoguous to the move 8146 // constructor rules. 8147 8148 QualType ArgType = Context.getTypeDeclType(ClassDecl); 8149 QualType RetType = Context.getLValueReferenceType(ArgType); 8150 ArgType = Context.getRValueReferenceType(ArgType); 8151 8152 // An implicitly-declared move assignment operator is an inline public 8153 // member of its class. 8154 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 8155 SourceLocation ClassLoc = ClassDecl->getLocation(); 8156 DeclarationNameInfo NameInfo(Name, ClassLoc); 8157 CXXMethodDecl *MoveAssignment 8158 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, QualType(), 8159 /*TInfo=*/0, /*isStatic=*/false, 8160 /*StorageClassAsWritten=*/SC_None, 8161 /*isInline=*/true, 8162 /*isConstexpr=*/false, 8163 SourceLocation()); 8164 MoveAssignment->setAccess(AS_public); 8165 MoveAssignment->setDefaulted(); 8166 MoveAssignment->setImplicit(); 8167 MoveAssignment->setTrivial(ClassDecl->hasTrivialMoveAssignment()); 8168 8169 // Build an exception specification pointing back at this member. 8170 FunctionProtoType::ExtProtoInfo EPI; 8171 EPI.ExceptionSpecType = EST_Unevaluated; 8172 EPI.ExceptionSpecDecl = MoveAssignment; 8173 MoveAssignment->setType(Context.getFunctionType(RetType, &ArgType, 1, EPI)); 8174 8175 // Add the parameter to the operator. 8176 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveAssignment, 8177 ClassLoc, ClassLoc, /*Id=*/0, 8178 ArgType, /*TInfo=*/0, 8179 SC_None, 8180 SC_None, 0); 8181 MoveAssignment->setParams(FromParam); 8182 8183 // Note that we have added this copy-assignment operator. 8184 ++ASTContext::NumImplicitMoveAssignmentOperatorsDeclared; 8185 8186 // C++0x [class.copy]p9: 8187 // If the definition of a class X does not explicitly declare a move 8188 // assignment operator, one will be implicitly declared as defaulted if and 8189 // only if: 8190 // [...] 8191 // - the move assignment operator would not be implicitly defined as 8192 // deleted. 8193 if (ShouldDeleteSpecialMember(MoveAssignment, CXXMoveAssignment)) { 8194 // Cache this result so that we don't try to generate this over and over 8195 // on every lookup, leaking memory and wasting time. 8196 ClassDecl->setFailedImplicitMoveAssignment(); 8197 return 0; 8198 } 8199 8200 if (Scope *S = getScopeForContext(ClassDecl)) 8201 PushOnScopeChains(MoveAssignment, S, false); 8202 ClassDecl->addDecl(MoveAssignment); 8203 8204 AddOverriddenMethods(ClassDecl, MoveAssignment); 8205 return MoveAssignment; 8206} 8207 8208void Sema::DefineImplicitMoveAssignment(SourceLocation CurrentLocation, 8209 CXXMethodDecl *MoveAssignOperator) { 8210 assert((MoveAssignOperator->isDefaulted() && 8211 MoveAssignOperator->isOverloadedOperator() && 8212 MoveAssignOperator->getOverloadedOperator() == OO_Equal && 8213 !MoveAssignOperator->doesThisDeclarationHaveABody() && 8214 !MoveAssignOperator->isDeleted()) && 8215 "DefineImplicitMoveAssignment called for wrong function"); 8216 8217 CXXRecordDecl *ClassDecl = MoveAssignOperator->getParent(); 8218 8219 if (ClassDecl->isInvalidDecl() || MoveAssignOperator->isInvalidDecl()) { 8220 MoveAssignOperator->setInvalidDecl(); 8221 return; 8222 } 8223 8224 MoveAssignOperator->setUsed(); 8225 8226 ImplicitlyDefinedFunctionScope Scope(*this, MoveAssignOperator); 8227 DiagnosticErrorTrap Trap(Diags); 8228 8229 // C++0x [class.copy]p28: 8230 // The implicitly-defined or move assignment operator for a non-union class 8231 // X performs memberwise move assignment of its subobjects. The direct base 8232 // classes of X are assigned first, in the order of their declaration in the 8233 // base-specifier-list, and then the immediate non-static data members of X 8234 // are assigned, in the order in which they were declared in the class 8235 // definition. 8236 8237 // The statements that form the synthesized function body. 8238 SmallVector<Stmt*, 8> Statements; 8239 8240 // The parameter for the "other" object, which we are move from. 8241 ParmVarDecl *Other = MoveAssignOperator->getParamDecl(0); 8242 QualType OtherRefType = Other->getType()-> 8243 getAs<RValueReferenceType>()->getPointeeType(); 8244 assert(OtherRefType.getQualifiers() == 0 && 8245 "Bad argument type of defaulted move assignment"); 8246 8247 // Our location for everything implicitly-generated. 8248 SourceLocation Loc = MoveAssignOperator->getLocation(); 8249 8250 // Construct a reference to the "other" object. We'll be using this 8251 // throughout the generated ASTs. 8252 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 8253 assert(OtherRef && "Reference to parameter cannot fail!"); 8254 // Cast to rvalue. 8255 OtherRef = CastForMoving(*this, OtherRef); 8256 8257 // Construct the "this" pointer. We'll be using this throughout the generated 8258 // ASTs. 8259 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 8260 assert(This && "Reference to this cannot fail!"); 8261 8262 // Assign base classes. 8263 bool Invalid = false; 8264 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8265 E = ClassDecl->bases_end(); Base != E; ++Base) { 8266 // Form the assignment: 8267 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&&>(other)); 8268 QualType BaseType = Base->getType().getUnqualifiedType(); 8269 if (!BaseType->isRecordType()) { 8270 Invalid = true; 8271 continue; 8272 } 8273 8274 CXXCastPath BasePath; 8275 BasePath.push_back(Base); 8276 8277 // Construct the "from" expression, which is an implicit cast to the 8278 // appropriately-qualified base type. 8279 Expr *From = OtherRef; 8280 From = ImpCastExprToType(From, BaseType, CK_UncheckedDerivedToBase, 8281 VK_XValue, &BasePath).take(); 8282 8283 // Dereference "this". 8284 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8285 8286 // Implicitly cast "this" to the appropriately-qualified base type. 8287 To = ImpCastExprToType(To.take(), 8288 Context.getCVRQualifiedType(BaseType, 8289 MoveAssignOperator->getTypeQualifiers()), 8290 CK_UncheckedDerivedToBase, 8291 VK_LValue, &BasePath); 8292 8293 // Build the move. 8294 StmtResult Move = BuildSingleCopyAssign(*this, Loc, BaseType, 8295 To.get(), From, 8296 /*CopyingBaseSubobject=*/true, 8297 /*Copying=*/false); 8298 if (Move.isInvalid()) { 8299 Diag(CurrentLocation, diag::note_member_synthesized_at) 8300 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8301 MoveAssignOperator->setInvalidDecl(); 8302 return; 8303 } 8304 8305 // Success! Record the move. 8306 Statements.push_back(Move.takeAs<Expr>()); 8307 } 8308 8309 // \brief Reference to the __builtin_memcpy function. 8310 Expr *BuiltinMemCpyRef = 0; 8311 // \brief Reference to the __builtin_objc_memmove_collectable function. 8312 Expr *CollectableMemCpyRef = 0; 8313 8314 // Assign non-static members. 8315 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8316 FieldEnd = ClassDecl->field_end(); 8317 Field != FieldEnd; ++Field) { 8318 if (Field->isUnnamedBitfield()) 8319 continue; 8320 8321 // Check for members of reference type; we can't move those. 8322 if (Field->getType()->isReferenceType()) { 8323 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8324 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 8325 Diag(Field->getLocation(), diag::note_declared_at); 8326 Diag(CurrentLocation, diag::note_member_synthesized_at) 8327 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8328 Invalid = true; 8329 continue; 8330 } 8331 8332 // Check for members of const-qualified, non-class type. 8333 QualType BaseType = Context.getBaseElementType(Field->getType()); 8334 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 8335 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8336 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 8337 Diag(Field->getLocation(), diag::note_declared_at); 8338 Diag(CurrentLocation, diag::note_member_synthesized_at) 8339 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8340 Invalid = true; 8341 continue; 8342 } 8343 8344 // Suppress assigning zero-width bitfields. 8345 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0) 8346 continue; 8347 8348 QualType FieldType = Field->getType().getNonReferenceType(); 8349 if (FieldType->isIncompleteArrayType()) { 8350 assert(ClassDecl->hasFlexibleArrayMember() && 8351 "Incomplete array type is not valid"); 8352 continue; 8353 } 8354 8355 // Build references to the field in the object we're copying from and to. 8356 CXXScopeSpec SS; // Intentionally empty 8357 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 8358 LookupMemberName); 8359 MemberLookup.addDecl(*Field); 8360 MemberLookup.resolveKind(); 8361 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 8362 Loc, /*IsArrow=*/false, 8363 SS, SourceLocation(), 0, 8364 MemberLookup, 0); 8365 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 8366 Loc, /*IsArrow=*/true, 8367 SS, SourceLocation(), 0, 8368 MemberLookup, 0); 8369 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 8370 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 8371 8372 assert(!From.get()->isLValue() && // could be xvalue or prvalue 8373 "Member reference with rvalue base must be rvalue except for reference " 8374 "members, which aren't allowed for move assignment."); 8375 8376 // If the field should be copied with __builtin_memcpy rather than via 8377 // explicit assignments, do so. This optimization only applies for arrays 8378 // of scalars and arrays of class type with trivial move-assignment 8379 // operators. 8380 if (FieldType->isArrayType() && !FieldType.isVolatileQualified() 8381 && BaseType.hasTrivialAssignment(Context, /*Copying=*/false)) { 8382 // Compute the size of the memory buffer to be copied. 8383 QualType SizeType = Context.getSizeType(); 8384 llvm::APInt Size(Context.getTypeSize(SizeType), 8385 Context.getTypeSizeInChars(BaseType).getQuantity()); 8386 for (const ConstantArrayType *Array 8387 = Context.getAsConstantArrayType(FieldType); 8388 Array; 8389 Array = Context.getAsConstantArrayType(Array->getElementType())) { 8390 llvm::APInt ArraySize 8391 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 8392 Size *= ArraySize; 8393 } 8394 8395 // Take the address of the field references for "from" and "to". We 8396 // directly construct UnaryOperators here because semantic analysis 8397 // does not permit us to take the address of an xvalue. 8398 From = new (Context) UnaryOperator(From.get(), UO_AddrOf, 8399 Context.getPointerType(From.get()->getType()), 8400 VK_RValue, OK_Ordinary, Loc); 8401 To = new (Context) UnaryOperator(To.get(), UO_AddrOf, 8402 Context.getPointerType(To.get()->getType()), 8403 VK_RValue, OK_Ordinary, Loc); 8404 8405 bool NeedsCollectableMemCpy = 8406 (BaseType->isRecordType() && 8407 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 8408 8409 if (NeedsCollectableMemCpy) { 8410 if (!CollectableMemCpyRef) { 8411 // Create a reference to the __builtin_objc_memmove_collectable function. 8412 LookupResult R(*this, 8413 &Context.Idents.get("__builtin_objc_memmove_collectable"), 8414 Loc, LookupOrdinaryName); 8415 LookupName(R, TUScope, true); 8416 8417 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 8418 if (!CollectableMemCpy) { 8419 // Something went horribly wrong earlier, and we will have 8420 // complained about it. 8421 Invalid = true; 8422 continue; 8423 } 8424 8425 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 8426 Context.BuiltinFnTy, 8427 VK_RValue, Loc, 0).take(); 8428 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 8429 } 8430 } 8431 // Create a reference to the __builtin_memcpy builtin function. 8432 else if (!BuiltinMemCpyRef) { 8433 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 8434 LookupOrdinaryName); 8435 LookupName(R, TUScope, true); 8436 8437 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 8438 if (!BuiltinMemCpy) { 8439 // Something went horribly wrong earlier, and we will have complained 8440 // about it. 8441 Invalid = true; 8442 continue; 8443 } 8444 8445 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 8446 Context.BuiltinFnTy, 8447 VK_RValue, Loc, 0).take(); 8448 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 8449 } 8450 8451 SmallVector<Expr*, 8> CallArgs; 8452 CallArgs.push_back(To.takeAs<Expr>()); 8453 CallArgs.push_back(From.takeAs<Expr>()); 8454 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 8455 ExprResult Call = ExprError(); 8456 if (NeedsCollectableMemCpy) 8457 Call = ActOnCallExpr(/*Scope=*/0, 8458 CollectableMemCpyRef, 8459 Loc, CallArgs, 8460 Loc); 8461 else 8462 Call = ActOnCallExpr(/*Scope=*/0, 8463 BuiltinMemCpyRef, 8464 Loc, CallArgs, 8465 Loc); 8466 8467 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 8468 Statements.push_back(Call.takeAs<Expr>()); 8469 continue; 8470 } 8471 8472 // Build the move of this field. 8473 StmtResult Move = BuildSingleCopyAssign(*this, Loc, FieldType, 8474 To.get(), From.get(), 8475 /*CopyingBaseSubobject=*/false, 8476 /*Copying=*/false); 8477 if (Move.isInvalid()) { 8478 Diag(CurrentLocation, diag::note_member_synthesized_at) 8479 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8480 MoveAssignOperator->setInvalidDecl(); 8481 return; 8482 } 8483 8484 // Success! Record the copy. 8485 Statements.push_back(Move.takeAs<Stmt>()); 8486 } 8487 8488 if (!Invalid) { 8489 // Add a "return *this;" 8490 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8491 8492 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 8493 if (Return.isInvalid()) 8494 Invalid = true; 8495 else { 8496 Statements.push_back(Return.takeAs<Stmt>()); 8497 8498 if (Trap.hasErrorOccurred()) { 8499 Diag(CurrentLocation, diag::note_member_synthesized_at) 8500 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8501 Invalid = true; 8502 } 8503 } 8504 } 8505 8506 if (Invalid) { 8507 MoveAssignOperator->setInvalidDecl(); 8508 return; 8509 } 8510 8511 StmtResult Body; 8512 { 8513 CompoundScopeRAII CompoundScope(*this); 8514 Body = ActOnCompoundStmt(Loc, Loc, Statements, 8515 /*isStmtExpr=*/false); 8516 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 8517 } 8518 MoveAssignOperator->setBody(Body.takeAs<Stmt>()); 8519 8520 if (ASTMutationListener *L = getASTMutationListener()) { 8521 L->CompletedImplicitDefinition(MoveAssignOperator); 8522 } 8523} 8524 8525/// Determine whether an implicit copy constructor for ClassDecl has a const 8526/// argument. 8527/// FIXME: It ought to be possible to store this on the record. 8528static bool isImplicitCopyCtorArgConst(Sema &S, CXXRecordDecl *ClassDecl) { 8529 if (ClassDecl->isInvalidDecl()) 8530 return true; 8531 8532 // C++ [class.copy]p5: 8533 // The implicitly-declared copy constructor for a class X will 8534 // have the form 8535 // 8536 // X::X(const X&) 8537 // 8538 // if 8539 // -- each direct or virtual base class B of X has a copy 8540 // constructor whose first parameter is of type const B& or 8541 // const volatile B&, and 8542 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8543 BaseEnd = ClassDecl->bases_end(); 8544 Base != BaseEnd; ++Base) { 8545 // Virtual bases are handled below. 8546 if (Base->isVirtual()) 8547 continue; 8548 8549 CXXRecordDecl *BaseClassDecl 8550 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8551 // FIXME: This lookup is wrong. If the copy ctor for a member or base is 8552 // ambiguous, we should still produce a constructor with a const-qualified 8553 // parameter. 8554 if (!S.LookupCopyingConstructor(BaseClassDecl, Qualifiers::Const)) 8555 return false; 8556 } 8557 8558 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8559 BaseEnd = ClassDecl->vbases_end(); 8560 Base != BaseEnd; ++Base) { 8561 CXXRecordDecl *BaseClassDecl 8562 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8563 if (!S.LookupCopyingConstructor(BaseClassDecl, Qualifiers::Const)) 8564 return false; 8565 } 8566 8567 // -- for all the nonstatic data members of X that are of a 8568 // class type M (or array thereof), each such class type 8569 // has a copy constructor whose first parameter is of type 8570 // const M& or const volatile M&. 8571 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8572 FieldEnd = ClassDecl->field_end(); 8573 Field != FieldEnd; ++Field) { 8574 QualType FieldType = S.Context.getBaseElementType(Field->getType()); 8575 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8576 if (!S.LookupCopyingConstructor(FieldClassDecl, Qualifiers::Const)) 8577 return false; 8578 } 8579 } 8580 8581 // Otherwise, the implicitly declared copy constructor will have 8582 // the form 8583 // 8584 // X::X(X&) 8585 8586 return true; 8587} 8588 8589Sema::ImplicitExceptionSpecification 8590Sema::ComputeDefaultedCopyCtorExceptionSpec(CXXMethodDecl *MD) { 8591 CXXRecordDecl *ClassDecl = MD->getParent(); 8592 8593 ImplicitExceptionSpecification ExceptSpec(*this); 8594 if (ClassDecl->isInvalidDecl()) 8595 return ExceptSpec; 8596 8597 const FunctionProtoType *T = MD->getType()->castAs<FunctionProtoType>(); 8598 assert(T->getNumArgs() >= 1 && "not a copy ctor"); 8599 unsigned Quals = T->getArgType(0).getNonReferenceType().getCVRQualifiers(); 8600 8601 // C++ [except.spec]p14: 8602 // An implicitly declared special member function (Clause 12) shall have an 8603 // exception-specification. [...] 8604 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8605 BaseEnd = ClassDecl->bases_end(); 8606 Base != BaseEnd; 8607 ++Base) { 8608 // Virtual bases are handled below. 8609 if (Base->isVirtual()) 8610 continue; 8611 8612 CXXRecordDecl *BaseClassDecl 8613 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8614 if (CXXConstructorDecl *CopyConstructor = 8615 LookupCopyingConstructor(BaseClassDecl, Quals)) 8616 ExceptSpec.CalledDecl(Base->getLocStart(), CopyConstructor); 8617 } 8618 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8619 BaseEnd = ClassDecl->vbases_end(); 8620 Base != BaseEnd; 8621 ++Base) { 8622 CXXRecordDecl *BaseClassDecl 8623 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8624 if (CXXConstructorDecl *CopyConstructor = 8625 LookupCopyingConstructor(BaseClassDecl, Quals)) 8626 ExceptSpec.CalledDecl(Base->getLocStart(), CopyConstructor); 8627 } 8628 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8629 FieldEnd = ClassDecl->field_end(); 8630 Field != FieldEnd; 8631 ++Field) { 8632 QualType FieldType = Context.getBaseElementType(Field->getType()); 8633 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8634 if (CXXConstructorDecl *CopyConstructor = 8635 LookupCopyingConstructor(FieldClassDecl, 8636 Quals | FieldType.getCVRQualifiers())) 8637 ExceptSpec.CalledDecl(Field->getLocation(), CopyConstructor); 8638 } 8639 } 8640 8641 return ExceptSpec; 8642} 8643 8644CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 8645 CXXRecordDecl *ClassDecl) { 8646 // C++ [class.copy]p4: 8647 // If the class definition does not explicitly declare a copy 8648 // constructor, one is declared implicitly. 8649 8650 QualType ClassType = Context.getTypeDeclType(ClassDecl); 8651 QualType ArgType = ClassType; 8652 bool Const = isImplicitCopyCtorArgConst(*this, ClassDecl); 8653 if (Const) 8654 ArgType = ArgType.withConst(); 8655 ArgType = Context.getLValueReferenceType(ArgType); 8656 8657 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, 8658 CXXCopyConstructor, 8659 Const); 8660 8661 DeclarationName Name 8662 = Context.DeclarationNames.getCXXConstructorName( 8663 Context.getCanonicalType(ClassType)); 8664 SourceLocation ClassLoc = ClassDecl->getLocation(); 8665 DeclarationNameInfo NameInfo(Name, ClassLoc); 8666 8667 // An implicitly-declared copy constructor is an inline public 8668 // member of its class. 8669 CXXConstructorDecl *CopyConstructor = CXXConstructorDecl::Create( 8670 Context, ClassDecl, ClassLoc, NameInfo, QualType(), /*TInfo=*/0, 8671 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 8672 Constexpr); 8673 CopyConstructor->setAccess(AS_public); 8674 CopyConstructor->setDefaulted(); 8675 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 8676 8677 // Build an exception specification pointing back at this member. 8678 FunctionProtoType::ExtProtoInfo EPI; 8679 EPI.ExceptionSpecType = EST_Unevaluated; 8680 EPI.ExceptionSpecDecl = CopyConstructor; 8681 CopyConstructor->setType( 8682 Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI)); 8683 8684 // Note that we have declared this constructor. 8685 ++ASTContext::NumImplicitCopyConstructorsDeclared; 8686 8687 // Add the parameter to the constructor. 8688 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 8689 ClassLoc, ClassLoc, 8690 /*IdentifierInfo=*/0, 8691 ArgType, /*TInfo=*/0, 8692 SC_None, 8693 SC_None, 0); 8694 CopyConstructor->setParams(FromParam); 8695 8696 if (Scope *S = getScopeForContext(ClassDecl)) 8697 PushOnScopeChains(CopyConstructor, S, false); 8698 ClassDecl->addDecl(CopyConstructor); 8699 8700 // C++11 [class.copy]p8: 8701 // ... If the class definition does not explicitly declare a copy 8702 // constructor, there is no user-declared move constructor, and there is no 8703 // user-declared move assignment operator, a copy constructor is implicitly 8704 // declared as defaulted. 8705 if (ShouldDeleteSpecialMember(CopyConstructor, CXXCopyConstructor)) 8706 CopyConstructor->setDeletedAsWritten(); 8707 8708 return CopyConstructor; 8709} 8710 8711void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 8712 CXXConstructorDecl *CopyConstructor) { 8713 assert((CopyConstructor->isDefaulted() && 8714 CopyConstructor->isCopyConstructor() && 8715 !CopyConstructor->doesThisDeclarationHaveABody() && 8716 !CopyConstructor->isDeleted()) && 8717 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 8718 8719 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 8720 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 8721 8722 ImplicitlyDefinedFunctionScope Scope(*this, CopyConstructor); 8723 DiagnosticErrorTrap Trap(Diags); 8724 8725 if (SetCtorInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) || 8726 Trap.hasErrorOccurred()) { 8727 Diag(CurrentLocation, diag::note_member_synthesized_at) 8728 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 8729 CopyConstructor->setInvalidDecl(); 8730 } else { 8731 Sema::CompoundScopeRAII CompoundScope(*this); 8732 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 8733 CopyConstructor->getLocation(), 8734 MultiStmtArg(), 8735 /*isStmtExpr=*/false) 8736 .takeAs<Stmt>()); 8737 CopyConstructor->setImplicitlyDefined(true); 8738 } 8739 8740 CopyConstructor->setUsed(); 8741 if (ASTMutationListener *L = getASTMutationListener()) { 8742 L->CompletedImplicitDefinition(CopyConstructor); 8743 } 8744} 8745 8746Sema::ImplicitExceptionSpecification 8747Sema::ComputeDefaultedMoveCtorExceptionSpec(CXXMethodDecl *MD) { 8748 CXXRecordDecl *ClassDecl = MD->getParent(); 8749 8750 // C++ [except.spec]p14: 8751 // An implicitly declared special member function (Clause 12) shall have an 8752 // exception-specification. [...] 8753 ImplicitExceptionSpecification ExceptSpec(*this); 8754 if (ClassDecl->isInvalidDecl()) 8755 return ExceptSpec; 8756 8757 // Direct base-class constructors. 8758 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 8759 BEnd = ClassDecl->bases_end(); 8760 B != BEnd; ++B) { 8761 if (B->isVirtual()) // Handled below. 8762 continue; 8763 8764 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 8765 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 8766 CXXConstructorDecl *Constructor = 8767 LookupMovingConstructor(BaseClassDecl, 0); 8768 // If this is a deleted function, add it anyway. This might be conformant 8769 // with the standard. This might not. I'm not sure. It might not matter. 8770 if (Constructor) 8771 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 8772 } 8773 } 8774 8775 // Virtual base-class constructors. 8776 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 8777 BEnd = ClassDecl->vbases_end(); 8778 B != BEnd; ++B) { 8779 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 8780 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 8781 CXXConstructorDecl *Constructor = 8782 LookupMovingConstructor(BaseClassDecl, 0); 8783 // If this is a deleted function, add it anyway. This might be conformant 8784 // with the standard. This might not. I'm not sure. It might not matter. 8785 if (Constructor) 8786 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 8787 } 8788 } 8789 8790 // Field constructors. 8791 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 8792 FEnd = ClassDecl->field_end(); 8793 F != FEnd; ++F) { 8794 QualType FieldType = Context.getBaseElementType(F->getType()); 8795 if (CXXRecordDecl *FieldRecDecl = FieldType->getAsCXXRecordDecl()) { 8796 CXXConstructorDecl *Constructor = 8797 LookupMovingConstructor(FieldRecDecl, FieldType.getCVRQualifiers()); 8798 // If this is a deleted function, add it anyway. This might be conformant 8799 // with the standard. This might not. I'm not sure. It might not matter. 8800 // In particular, the problem is that this function never gets called. It 8801 // might just be ill-formed because this function attempts to refer to 8802 // a deleted function here. 8803 if (Constructor) 8804 ExceptSpec.CalledDecl(F->getLocation(), Constructor); 8805 } 8806 } 8807 8808 return ExceptSpec; 8809} 8810 8811CXXConstructorDecl *Sema::DeclareImplicitMoveConstructor( 8812 CXXRecordDecl *ClassDecl) { 8813 // C++11 [class.copy]p9: 8814 // If the definition of a class X does not explicitly declare a move 8815 // constructor, one will be implicitly declared as defaulted if and only if: 8816 // 8817 // - [first 4 bullets] 8818 assert(ClassDecl->needsImplicitMoveConstructor()); 8819 8820 // [Checked after we build the declaration] 8821 // - the move assignment operator would not be implicitly defined as 8822 // deleted, 8823 8824 // [DR1402]: 8825 // - each of X's non-static data members and direct or virtual base classes 8826 // has a type that either has a move constructor or is trivially copyable. 8827 if (!subobjectsHaveMoveOrTrivialCopy(*this, ClassDecl, /*Constructor*/true)) { 8828 ClassDecl->setFailedImplicitMoveConstructor(); 8829 return 0; 8830 } 8831 8832 QualType ClassType = Context.getTypeDeclType(ClassDecl); 8833 QualType ArgType = Context.getRValueReferenceType(ClassType); 8834 8835 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, 8836 CXXMoveConstructor, 8837 false); 8838 8839 DeclarationName Name 8840 = Context.DeclarationNames.getCXXConstructorName( 8841 Context.getCanonicalType(ClassType)); 8842 SourceLocation ClassLoc = ClassDecl->getLocation(); 8843 DeclarationNameInfo NameInfo(Name, ClassLoc); 8844 8845 // C++0x [class.copy]p11: 8846 // An implicitly-declared copy/move constructor is an inline public 8847 // member of its class. 8848 CXXConstructorDecl *MoveConstructor = CXXConstructorDecl::Create( 8849 Context, ClassDecl, ClassLoc, NameInfo, QualType(), /*TInfo=*/0, 8850 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 8851 Constexpr); 8852 MoveConstructor->setAccess(AS_public); 8853 MoveConstructor->setDefaulted(); 8854 MoveConstructor->setTrivial(ClassDecl->hasTrivialMoveConstructor()); 8855 8856 // Build an exception specification pointing back at this member. 8857 FunctionProtoType::ExtProtoInfo EPI; 8858 EPI.ExceptionSpecType = EST_Unevaluated; 8859 EPI.ExceptionSpecDecl = MoveConstructor; 8860 MoveConstructor->setType( 8861 Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI)); 8862 8863 // Add the parameter to the constructor. 8864 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveConstructor, 8865 ClassLoc, ClassLoc, 8866 /*IdentifierInfo=*/0, 8867 ArgType, /*TInfo=*/0, 8868 SC_None, 8869 SC_None, 0); 8870 MoveConstructor->setParams(FromParam); 8871 8872 // C++0x [class.copy]p9: 8873 // If the definition of a class X does not explicitly declare a move 8874 // constructor, one will be implicitly declared as defaulted if and only if: 8875 // [...] 8876 // - the move constructor would not be implicitly defined as deleted. 8877 if (ShouldDeleteSpecialMember(MoveConstructor, CXXMoveConstructor)) { 8878 // Cache this result so that we don't try to generate this over and over 8879 // on every lookup, leaking memory and wasting time. 8880 ClassDecl->setFailedImplicitMoveConstructor(); 8881 return 0; 8882 } 8883 8884 // Note that we have declared this constructor. 8885 ++ASTContext::NumImplicitMoveConstructorsDeclared; 8886 8887 if (Scope *S = getScopeForContext(ClassDecl)) 8888 PushOnScopeChains(MoveConstructor, S, false); 8889 ClassDecl->addDecl(MoveConstructor); 8890 8891 return MoveConstructor; 8892} 8893 8894void Sema::DefineImplicitMoveConstructor(SourceLocation CurrentLocation, 8895 CXXConstructorDecl *MoveConstructor) { 8896 assert((MoveConstructor->isDefaulted() && 8897 MoveConstructor->isMoveConstructor() && 8898 !MoveConstructor->doesThisDeclarationHaveABody() && 8899 !MoveConstructor->isDeleted()) && 8900 "DefineImplicitMoveConstructor - call it for implicit move ctor"); 8901 8902 CXXRecordDecl *ClassDecl = MoveConstructor->getParent(); 8903 assert(ClassDecl && "DefineImplicitMoveConstructor - invalid constructor"); 8904 8905 ImplicitlyDefinedFunctionScope Scope(*this, MoveConstructor); 8906 DiagnosticErrorTrap Trap(Diags); 8907 8908 if (SetCtorInitializers(MoveConstructor, 0, 0, /*AnyErrors=*/false) || 8909 Trap.hasErrorOccurred()) { 8910 Diag(CurrentLocation, diag::note_member_synthesized_at) 8911 << CXXMoveConstructor << Context.getTagDeclType(ClassDecl); 8912 MoveConstructor->setInvalidDecl(); 8913 } else { 8914 Sema::CompoundScopeRAII CompoundScope(*this); 8915 MoveConstructor->setBody(ActOnCompoundStmt(MoveConstructor->getLocation(), 8916 MoveConstructor->getLocation(), 8917 MultiStmtArg(), 8918 /*isStmtExpr=*/false) 8919 .takeAs<Stmt>()); 8920 MoveConstructor->setImplicitlyDefined(true); 8921 } 8922 8923 MoveConstructor->setUsed(); 8924 8925 if (ASTMutationListener *L = getASTMutationListener()) { 8926 L->CompletedImplicitDefinition(MoveConstructor); 8927 } 8928} 8929 8930bool Sema::isImplicitlyDeleted(FunctionDecl *FD) { 8931 return FD->isDeleted() && 8932 (FD->isDefaulted() || FD->isImplicit()) && 8933 isa<CXXMethodDecl>(FD); 8934} 8935 8936/// \brief Mark the call operator of the given lambda closure type as "used". 8937static void markLambdaCallOperatorUsed(Sema &S, CXXRecordDecl *Lambda) { 8938 CXXMethodDecl *CallOperator 8939 = cast<CXXMethodDecl>( 8940 *Lambda->lookup( 8941 S.Context.DeclarationNames.getCXXOperatorName(OO_Call)).first); 8942 CallOperator->setReferenced(); 8943 CallOperator->setUsed(); 8944} 8945 8946void Sema::DefineImplicitLambdaToFunctionPointerConversion( 8947 SourceLocation CurrentLocation, 8948 CXXConversionDecl *Conv) 8949{ 8950 CXXRecordDecl *Lambda = Conv->getParent(); 8951 8952 // Make sure that the lambda call operator is marked used. 8953 markLambdaCallOperatorUsed(*this, Lambda); 8954 8955 Conv->setUsed(); 8956 8957 ImplicitlyDefinedFunctionScope Scope(*this, Conv); 8958 DiagnosticErrorTrap Trap(Diags); 8959 8960 // Return the address of the __invoke function. 8961 DeclarationName InvokeName = &Context.Idents.get("__invoke"); 8962 CXXMethodDecl *Invoke 8963 = cast<CXXMethodDecl>(*Lambda->lookup(InvokeName).first); 8964 Expr *FunctionRef = BuildDeclRefExpr(Invoke, Invoke->getType(), 8965 VK_LValue, Conv->getLocation()).take(); 8966 assert(FunctionRef && "Can't refer to __invoke function?"); 8967 Stmt *Return = ActOnReturnStmt(Conv->getLocation(), FunctionRef).take(); 8968 Conv->setBody(new (Context) CompoundStmt(Context, &Return, 1, 8969 Conv->getLocation(), 8970 Conv->getLocation())); 8971 8972 // Fill in the __invoke function with a dummy implementation. IR generation 8973 // will fill in the actual details. 8974 Invoke->setUsed(); 8975 Invoke->setReferenced(); 8976 Invoke->setBody(new (Context) CompoundStmt(Conv->getLocation())); 8977 8978 if (ASTMutationListener *L = getASTMutationListener()) { 8979 L->CompletedImplicitDefinition(Conv); 8980 L->CompletedImplicitDefinition(Invoke); 8981 } 8982} 8983 8984void Sema::DefineImplicitLambdaToBlockPointerConversion( 8985 SourceLocation CurrentLocation, 8986 CXXConversionDecl *Conv) 8987{ 8988 Conv->setUsed(); 8989 8990 ImplicitlyDefinedFunctionScope Scope(*this, Conv); 8991 DiagnosticErrorTrap Trap(Diags); 8992 8993 // Copy-initialize the lambda object as needed to capture it. 8994 Expr *This = ActOnCXXThis(CurrentLocation).take(); 8995 Expr *DerefThis =CreateBuiltinUnaryOp(CurrentLocation, UO_Deref, This).take(); 8996 8997 ExprResult BuildBlock = BuildBlockForLambdaConversion(CurrentLocation, 8998 Conv->getLocation(), 8999 Conv, DerefThis); 9000 9001 // If we're not under ARC, make sure we still get the _Block_copy/autorelease 9002 // behavior. Note that only the general conversion function does this 9003 // (since it's unusable otherwise); in the case where we inline the 9004 // block literal, it has block literal lifetime semantics. 9005 if (!BuildBlock.isInvalid() && !getLangOpts().ObjCAutoRefCount) 9006 BuildBlock = ImplicitCastExpr::Create(Context, BuildBlock.get()->getType(), 9007 CK_CopyAndAutoreleaseBlockObject, 9008 BuildBlock.get(), 0, VK_RValue); 9009 9010 if (BuildBlock.isInvalid()) { 9011 Diag(CurrentLocation, diag::note_lambda_to_block_conv); 9012 Conv->setInvalidDecl(); 9013 return; 9014 } 9015 9016 // Create the return statement that returns the block from the conversion 9017 // function. 9018 StmtResult Return = ActOnReturnStmt(Conv->getLocation(), BuildBlock.get()); 9019 if (Return.isInvalid()) { 9020 Diag(CurrentLocation, diag::note_lambda_to_block_conv); 9021 Conv->setInvalidDecl(); 9022 return; 9023 } 9024 9025 // Set the body of the conversion function. 9026 Stmt *ReturnS = Return.take(); 9027 Conv->setBody(new (Context) CompoundStmt(Context, &ReturnS, 1, 9028 Conv->getLocation(), 9029 Conv->getLocation())); 9030 9031 // We're done; notify the mutation listener, if any. 9032 if (ASTMutationListener *L = getASTMutationListener()) { 9033 L->CompletedImplicitDefinition(Conv); 9034 } 9035} 9036 9037/// \brief Determine whether the given list arguments contains exactly one 9038/// "real" (non-default) argument. 9039static bool hasOneRealArgument(MultiExprArg Args) { 9040 switch (Args.size()) { 9041 case 0: 9042 return false; 9043 9044 default: 9045 if (!Args[1]->isDefaultArgument()) 9046 return false; 9047 9048 // fall through 9049 case 1: 9050 return !Args[0]->isDefaultArgument(); 9051 } 9052 9053 return false; 9054} 9055 9056ExprResult 9057Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 9058 CXXConstructorDecl *Constructor, 9059 MultiExprArg ExprArgs, 9060 bool HadMultipleCandidates, 9061 bool RequiresZeroInit, 9062 unsigned ConstructKind, 9063 SourceRange ParenRange) { 9064 bool Elidable = false; 9065 9066 // C++0x [class.copy]p34: 9067 // When certain criteria are met, an implementation is allowed to 9068 // omit the copy/move construction of a class object, even if the 9069 // copy/move constructor and/or destructor for the object have 9070 // side effects. [...] 9071 // - when a temporary class object that has not been bound to a 9072 // reference (12.2) would be copied/moved to a class object 9073 // with the same cv-unqualified type, the copy/move operation 9074 // can be omitted by constructing the temporary object 9075 // directly into the target of the omitted copy/move 9076 if (ConstructKind == CXXConstructExpr::CK_Complete && 9077 Constructor->isCopyOrMoveConstructor() && hasOneRealArgument(ExprArgs)) { 9078 Expr *SubExpr = ExprArgs[0]; 9079 Elidable = SubExpr->isTemporaryObject(Context, Constructor->getParent()); 9080 } 9081 9082 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 9083 Elidable, ExprArgs, HadMultipleCandidates, 9084 RequiresZeroInit, ConstructKind, ParenRange); 9085} 9086 9087/// BuildCXXConstructExpr - Creates a complete call to a constructor, 9088/// including handling of its default argument expressions. 9089ExprResult 9090Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 9091 CXXConstructorDecl *Constructor, bool Elidable, 9092 MultiExprArg ExprArgs, 9093 bool HadMultipleCandidates, 9094 bool RequiresZeroInit, 9095 unsigned ConstructKind, 9096 SourceRange ParenRange) { 9097 MarkFunctionReferenced(ConstructLoc, Constructor); 9098 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 9099 Constructor, Elidable, ExprArgs, 9100 HadMultipleCandidates, /*FIXME*/false, 9101 RequiresZeroInit, 9102 static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind), 9103 ParenRange)); 9104} 9105 9106bool Sema::InitializeVarWithConstructor(VarDecl *VD, 9107 CXXConstructorDecl *Constructor, 9108 MultiExprArg Exprs, 9109 bool HadMultipleCandidates) { 9110 // FIXME: Provide the correct paren SourceRange when available. 9111 ExprResult TempResult = 9112 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 9113 Exprs, HadMultipleCandidates, false, 9114 CXXConstructExpr::CK_Complete, SourceRange()); 9115 if (TempResult.isInvalid()) 9116 return true; 9117 9118 Expr *Temp = TempResult.takeAs<Expr>(); 9119 CheckImplicitConversions(Temp, VD->getLocation()); 9120 MarkFunctionReferenced(VD->getLocation(), Constructor); 9121 Temp = MaybeCreateExprWithCleanups(Temp); 9122 VD->setInit(Temp); 9123 9124 return false; 9125} 9126 9127void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 9128 if (VD->isInvalidDecl()) return; 9129 9130 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 9131 if (ClassDecl->isInvalidDecl()) return; 9132 if (ClassDecl->hasIrrelevantDestructor()) return; 9133 if (ClassDecl->isDependentContext()) return; 9134 9135 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 9136 MarkFunctionReferenced(VD->getLocation(), Destructor); 9137 CheckDestructorAccess(VD->getLocation(), Destructor, 9138 PDiag(diag::err_access_dtor_var) 9139 << VD->getDeclName() 9140 << VD->getType()); 9141 DiagnoseUseOfDecl(Destructor, VD->getLocation()); 9142 9143 if (!VD->hasGlobalStorage()) return; 9144 9145 // Emit warning for non-trivial dtor in global scope (a real global, 9146 // class-static, function-static). 9147 Diag(VD->getLocation(), diag::warn_exit_time_destructor); 9148 9149 // TODO: this should be re-enabled for static locals by !CXAAtExit 9150 if (!VD->isStaticLocal()) 9151 Diag(VD->getLocation(), diag::warn_global_destructor); 9152} 9153 9154/// \brief Given a constructor and the set of arguments provided for the 9155/// constructor, convert the arguments and add any required default arguments 9156/// to form a proper call to this constructor. 9157/// 9158/// \returns true if an error occurred, false otherwise. 9159bool 9160Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 9161 MultiExprArg ArgsPtr, 9162 SourceLocation Loc, 9163 SmallVectorImpl<Expr*> &ConvertedArgs, 9164 bool AllowExplicit) { 9165 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 9166 unsigned NumArgs = ArgsPtr.size(); 9167 Expr **Args = ArgsPtr.data(); 9168 9169 const FunctionProtoType *Proto 9170 = Constructor->getType()->getAs<FunctionProtoType>(); 9171 assert(Proto && "Constructor without a prototype?"); 9172 unsigned NumArgsInProto = Proto->getNumArgs(); 9173 9174 // If too few arguments are available, we'll fill in the rest with defaults. 9175 if (NumArgs < NumArgsInProto) 9176 ConvertedArgs.reserve(NumArgsInProto); 9177 else 9178 ConvertedArgs.reserve(NumArgs); 9179 9180 VariadicCallType CallType = 9181 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 9182 SmallVector<Expr *, 8> AllArgs; 9183 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 9184 Proto, 0, Args, NumArgs, AllArgs, 9185 CallType, AllowExplicit); 9186 ConvertedArgs.append(AllArgs.begin(), AllArgs.end()); 9187 9188 DiagnoseSentinelCalls(Constructor, Loc, AllArgs.data(), AllArgs.size()); 9189 9190 CheckConstructorCall(Constructor, AllArgs.data(), AllArgs.size(), 9191 Proto, Loc); 9192 9193 return Invalid; 9194} 9195 9196static inline bool 9197CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 9198 const FunctionDecl *FnDecl) { 9199 const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext(); 9200 if (isa<NamespaceDecl>(DC)) { 9201 return SemaRef.Diag(FnDecl->getLocation(), 9202 diag::err_operator_new_delete_declared_in_namespace) 9203 << FnDecl->getDeclName(); 9204 } 9205 9206 if (isa<TranslationUnitDecl>(DC) && 9207 FnDecl->getStorageClass() == SC_Static) { 9208 return SemaRef.Diag(FnDecl->getLocation(), 9209 diag::err_operator_new_delete_declared_static) 9210 << FnDecl->getDeclName(); 9211 } 9212 9213 return false; 9214} 9215 9216static inline bool 9217CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 9218 CanQualType ExpectedResultType, 9219 CanQualType ExpectedFirstParamType, 9220 unsigned DependentParamTypeDiag, 9221 unsigned InvalidParamTypeDiag) { 9222 QualType ResultType = 9223 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 9224 9225 // Check that the result type is not dependent. 9226 if (ResultType->isDependentType()) 9227 return SemaRef.Diag(FnDecl->getLocation(), 9228 diag::err_operator_new_delete_dependent_result_type) 9229 << FnDecl->getDeclName() << ExpectedResultType; 9230 9231 // Check that the result type is what we expect. 9232 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 9233 return SemaRef.Diag(FnDecl->getLocation(), 9234 diag::err_operator_new_delete_invalid_result_type) 9235 << FnDecl->getDeclName() << ExpectedResultType; 9236 9237 // A function template must have at least 2 parameters. 9238 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 9239 return SemaRef.Diag(FnDecl->getLocation(), 9240 diag::err_operator_new_delete_template_too_few_parameters) 9241 << FnDecl->getDeclName(); 9242 9243 // The function decl must have at least 1 parameter. 9244 if (FnDecl->getNumParams() == 0) 9245 return SemaRef.Diag(FnDecl->getLocation(), 9246 diag::err_operator_new_delete_too_few_parameters) 9247 << FnDecl->getDeclName(); 9248 9249 // Check the first parameter type is not dependent. 9250 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 9251 if (FirstParamType->isDependentType()) 9252 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 9253 << FnDecl->getDeclName() << ExpectedFirstParamType; 9254 9255 // Check that the first parameter type is what we expect. 9256 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 9257 ExpectedFirstParamType) 9258 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 9259 << FnDecl->getDeclName() << ExpectedFirstParamType; 9260 9261 return false; 9262} 9263 9264static bool 9265CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 9266 // C++ [basic.stc.dynamic.allocation]p1: 9267 // A program is ill-formed if an allocation function is declared in a 9268 // namespace scope other than global scope or declared static in global 9269 // scope. 9270 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 9271 return true; 9272 9273 CanQualType SizeTy = 9274 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 9275 9276 // C++ [basic.stc.dynamic.allocation]p1: 9277 // The return type shall be void*. The first parameter shall have type 9278 // std::size_t. 9279 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 9280 SizeTy, 9281 diag::err_operator_new_dependent_param_type, 9282 diag::err_operator_new_param_type)) 9283 return true; 9284 9285 // C++ [basic.stc.dynamic.allocation]p1: 9286 // The first parameter shall not have an associated default argument. 9287 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 9288 return SemaRef.Diag(FnDecl->getLocation(), 9289 diag::err_operator_new_default_arg) 9290 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 9291 9292 return false; 9293} 9294 9295static bool 9296CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 9297 // C++ [basic.stc.dynamic.deallocation]p1: 9298 // A program is ill-formed if deallocation functions are declared in a 9299 // namespace scope other than global scope or declared static in global 9300 // scope. 9301 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 9302 return true; 9303 9304 // C++ [basic.stc.dynamic.deallocation]p2: 9305 // Each deallocation function shall return void and its first parameter 9306 // shall be void*. 9307 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 9308 SemaRef.Context.VoidPtrTy, 9309 diag::err_operator_delete_dependent_param_type, 9310 diag::err_operator_delete_param_type)) 9311 return true; 9312 9313 return false; 9314} 9315 9316/// CheckOverloadedOperatorDeclaration - Check whether the declaration 9317/// of this overloaded operator is well-formed. If so, returns false; 9318/// otherwise, emits appropriate diagnostics and returns true. 9319bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 9320 assert(FnDecl && FnDecl->isOverloadedOperator() && 9321 "Expected an overloaded operator declaration"); 9322 9323 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 9324 9325 // C++ [over.oper]p5: 9326 // The allocation and deallocation functions, operator new, 9327 // operator new[], operator delete and operator delete[], are 9328 // described completely in 3.7.3. The attributes and restrictions 9329 // found in the rest of this subclause do not apply to them unless 9330 // explicitly stated in 3.7.3. 9331 if (Op == OO_Delete || Op == OO_Array_Delete) 9332 return CheckOperatorDeleteDeclaration(*this, FnDecl); 9333 9334 if (Op == OO_New || Op == OO_Array_New) 9335 return CheckOperatorNewDeclaration(*this, FnDecl); 9336 9337 // C++ [over.oper]p6: 9338 // An operator function shall either be a non-static member 9339 // function or be a non-member function and have at least one 9340 // parameter whose type is a class, a reference to a class, an 9341 // enumeration, or a reference to an enumeration. 9342 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 9343 if (MethodDecl->isStatic()) 9344 return Diag(FnDecl->getLocation(), 9345 diag::err_operator_overload_static) << FnDecl->getDeclName(); 9346 } else { 9347 bool ClassOrEnumParam = false; 9348 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 9349 ParamEnd = FnDecl->param_end(); 9350 Param != ParamEnd; ++Param) { 9351 QualType ParamType = (*Param)->getType().getNonReferenceType(); 9352 if (ParamType->isDependentType() || ParamType->isRecordType() || 9353 ParamType->isEnumeralType()) { 9354 ClassOrEnumParam = true; 9355 break; 9356 } 9357 } 9358 9359 if (!ClassOrEnumParam) 9360 return Diag(FnDecl->getLocation(), 9361 diag::err_operator_overload_needs_class_or_enum) 9362 << FnDecl->getDeclName(); 9363 } 9364 9365 // C++ [over.oper]p8: 9366 // An operator function cannot have default arguments (8.3.6), 9367 // except where explicitly stated below. 9368 // 9369 // Only the function-call operator allows default arguments 9370 // (C++ [over.call]p1). 9371 if (Op != OO_Call) { 9372 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 9373 Param != FnDecl->param_end(); ++Param) { 9374 if ((*Param)->hasDefaultArg()) 9375 return Diag((*Param)->getLocation(), 9376 diag::err_operator_overload_default_arg) 9377 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 9378 } 9379 } 9380 9381 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 9382 { false, false, false } 9383#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 9384 , { Unary, Binary, MemberOnly } 9385#include "clang/Basic/OperatorKinds.def" 9386 }; 9387 9388 bool CanBeUnaryOperator = OperatorUses[Op][0]; 9389 bool CanBeBinaryOperator = OperatorUses[Op][1]; 9390 bool MustBeMemberOperator = OperatorUses[Op][2]; 9391 9392 // C++ [over.oper]p8: 9393 // [...] Operator functions cannot have more or fewer parameters 9394 // than the number required for the corresponding operator, as 9395 // described in the rest of this subclause. 9396 unsigned NumParams = FnDecl->getNumParams() 9397 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 9398 if (Op != OO_Call && 9399 ((NumParams == 1 && !CanBeUnaryOperator) || 9400 (NumParams == 2 && !CanBeBinaryOperator) || 9401 (NumParams < 1) || (NumParams > 2))) { 9402 // We have the wrong number of parameters. 9403 unsigned ErrorKind; 9404 if (CanBeUnaryOperator && CanBeBinaryOperator) { 9405 ErrorKind = 2; // 2 -> unary or binary. 9406 } else if (CanBeUnaryOperator) { 9407 ErrorKind = 0; // 0 -> unary 9408 } else { 9409 assert(CanBeBinaryOperator && 9410 "All non-call overloaded operators are unary or binary!"); 9411 ErrorKind = 1; // 1 -> binary 9412 } 9413 9414 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 9415 << FnDecl->getDeclName() << NumParams << ErrorKind; 9416 } 9417 9418 // Overloaded operators other than operator() cannot be variadic. 9419 if (Op != OO_Call && 9420 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 9421 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 9422 << FnDecl->getDeclName(); 9423 } 9424 9425 // Some operators must be non-static member functions. 9426 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 9427 return Diag(FnDecl->getLocation(), 9428 diag::err_operator_overload_must_be_member) 9429 << FnDecl->getDeclName(); 9430 } 9431 9432 // C++ [over.inc]p1: 9433 // The user-defined function called operator++ implements the 9434 // prefix and postfix ++ operator. If this function is a member 9435 // function with no parameters, or a non-member function with one 9436 // parameter of class or enumeration type, it defines the prefix 9437 // increment operator ++ for objects of that type. If the function 9438 // is a member function with one parameter (which shall be of type 9439 // int) or a non-member function with two parameters (the second 9440 // of which shall be of type int), it defines the postfix 9441 // increment operator ++ for objects of that type. 9442 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 9443 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 9444 bool ParamIsInt = false; 9445 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 9446 ParamIsInt = BT->getKind() == BuiltinType::Int; 9447 9448 if (!ParamIsInt) 9449 return Diag(LastParam->getLocation(), 9450 diag::err_operator_overload_post_incdec_must_be_int) 9451 << LastParam->getType() << (Op == OO_MinusMinus); 9452 } 9453 9454 return false; 9455} 9456 9457/// CheckLiteralOperatorDeclaration - Check whether the declaration 9458/// of this literal operator function is well-formed. If so, returns 9459/// false; otherwise, emits appropriate diagnostics and returns true. 9460bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 9461 if (isa<CXXMethodDecl>(FnDecl)) { 9462 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 9463 << FnDecl->getDeclName(); 9464 return true; 9465 } 9466 9467 if (FnDecl->isExternC()) { 9468 Diag(FnDecl->getLocation(), diag::err_literal_operator_extern_c); 9469 return true; 9470 } 9471 9472 bool Valid = false; 9473 9474 // This might be the definition of a literal operator template. 9475 FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate(); 9476 // This might be a specialization of a literal operator template. 9477 if (!TpDecl) 9478 TpDecl = FnDecl->getPrimaryTemplate(); 9479 9480 // template <char...> type operator "" name() is the only valid template 9481 // signature, and the only valid signature with no parameters. 9482 if (TpDecl) { 9483 if (FnDecl->param_size() == 0) { 9484 // Must have only one template parameter 9485 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 9486 if (Params->size() == 1) { 9487 NonTypeTemplateParmDecl *PmDecl = 9488 dyn_cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 9489 9490 // The template parameter must be a char parameter pack. 9491 if (PmDecl && PmDecl->isTemplateParameterPack() && 9492 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 9493 Valid = true; 9494 } 9495 } 9496 } else if (FnDecl->param_size()) { 9497 // Check the first parameter 9498 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 9499 9500 QualType T = (*Param)->getType().getUnqualifiedType(); 9501 9502 // unsigned long long int, long double, and any character type are allowed 9503 // as the only parameters. 9504 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 9505 Context.hasSameType(T, Context.LongDoubleTy) || 9506 Context.hasSameType(T, Context.CharTy) || 9507 Context.hasSameType(T, Context.WCharTy) || 9508 Context.hasSameType(T, Context.Char16Ty) || 9509 Context.hasSameType(T, Context.Char32Ty)) { 9510 if (++Param == FnDecl->param_end()) 9511 Valid = true; 9512 goto FinishedParams; 9513 } 9514 9515 // Otherwise it must be a pointer to const; let's strip those qualifiers. 9516 const PointerType *PT = T->getAs<PointerType>(); 9517 if (!PT) 9518 goto FinishedParams; 9519 T = PT->getPointeeType(); 9520 if (!T.isConstQualified() || T.isVolatileQualified()) 9521 goto FinishedParams; 9522 T = T.getUnqualifiedType(); 9523 9524 // Move on to the second parameter; 9525 ++Param; 9526 9527 // If there is no second parameter, the first must be a const char * 9528 if (Param == FnDecl->param_end()) { 9529 if (Context.hasSameType(T, Context.CharTy)) 9530 Valid = true; 9531 goto FinishedParams; 9532 } 9533 9534 // const char *, const wchar_t*, const char16_t*, and const char32_t* 9535 // are allowed as the first parameter to a two-parameter function 9536 if (!(Context.hasSameType(T, Context.CharTy) || 9537 Context.hasSameType(T, Context.WCharTy) || 9538 Context.hasSameType(T, Context.Char16Ty) || 9539 Context.hasSameType(T, Context.Char32Ty))) 9540 goto FinishedParams; 9541 9542 // The second and final parameter must be an std::size_t 9543 T = (*Param)->getType().getUnqualifiedType(); 9544 if (Context.hasSameType(T, Context.getSizeType()) && 9545 ++Param == FnDecl->param_end()) 9546 Valid = true; 9547 } 9548 9549 // FIXME: This diagnostic is absolutely terrible. 9550FinishedParams: 9551 if (!Valid) { 9552 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 9553 << FnDecl->getDeclName(); 9554 return true; 9555 } 9556 9557 // A parameter-declaration-clause containing a default argument is not 9558 // equivalent to any of the permitted forms. 9559 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 9560 ParamEnd = FnDecl->param_end(); 9561 Param != ParamEnd; ++Param) { 9562 if ((*Param)->hasDefaultArg()) { 9563 Diag((*Param)->getDefaultArgRange().getBegin(), 9564 diag::err_literal_operator_default_argument) 9565 << (*Param)->getDefaultArgRange(); 9566 break; 9567 } 9568 } 9569 9570 StringRef LiteralName 9571 = FnDecl->getDeclName().getCXXLiteralIdentifier()->getName(); 9572 if (LiteralName[0] != '_') { 9573 // C++11 [usrlit.suffix]p1: 9574 // Literal suffix identifiers that do not start with an underscore 9575 // are reserved for future standardization. 9576 Diag(FnDecl->getLocation(), diag::warn_user_literal_reserved); 9577 } 9578 9579 return false; 9580} 9581 9582/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 9583/// linkage specification, including the language and (if present) 9584/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 9585/// the location of the language string literal, which is provided 9586/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 9587/// the '{' brace. Otherwise, this linkage specification does not 9588/// have any braces. 9589Decl *Sema::ActOnStartLinkageSpecification(Scope *S, SourceLocation ExternLoc, 9590 SourceLocation LangLoc, 9591 StringRef Lang, 9592 SourceLocation LBraceLoc) { 9593 LinkageSpecDecl::LanguageIDs Language; 9594 if (Lang == "\"C\"") 9595 Language = LinkageSpecDecl::lang_c; 9596 else if (Lang == "\"C++\"") 9597 Language = LinkageSpecDecl::lang_cxx; 9598 else { 9599 Diag(LangLoc, diag::err_bad_language); 9600 return 0; 9601 } 9602 9603 // FIXME: Add all the various semantics of linkage specifications 9604 9605 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 9606 ExternLoc, LangLoc, Language); 9607 CurContext->addDecl(D); 9608 PushDeclContext(S, D); 9609 return D; 9610} 9611 9612/// ActOnFinishLinkageSpecification - Complete the definition of 9613/// the C++ linkage specification LinkageSpec. If RBraceLoc is 9614/// valid, it's the position of the closing '}' brace in a linkage 9615/// specification that uses braces. 9616Decl *Sema::ActOnFinishLinkageSpecification(Scope *S, 9617 Decl *LinkageSpec, 9618 SourceLocation RBraceLoc) { 9619 if (LinkageSpec) { 9620 if (RBraceLoc.isValid()) { 9621 LinkageSpecDecl* LSDecl = cast<LinkageSpecDecl>(LinkageSpec); 9622 LSDecl->setRBraceLoc(RBraceLoc); 9623 } 9624 PopDeclContext(); 9625 } 9626 return LinkageSpec; 9627} 9628 9629/// \brief Perform semantic analysis for the variable declaration that 9630/// occurs within a C++ catch clause, returning the newly-created 9631/// variable. 9632VarDecl *Sema::BuildExceptionDeclaration(Scope *S, 9633 TypeSourceInfo *TInfo, 9634 SourceLocation StartLoc, 9635 SourceLocation Loc, 9636 IdentifierInfo *Name) { 9637 bool Invalid = false; 9638 QualType ExDeclType = TInfo->getType(); 9639 9640 // Arrays and functions decay. 9641 if (ExDeclType->isArrayType()) 9642 ExDeclType = Context.getArrayDecayedType(ExDeclType); 9643 else if (ExDeclType->isFunctionType()) 9644 ExDeclType = Context.getPointerType(ExDeclType); 9645 9646 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 9647 // The exception-declaration shall not denote a pointer or reference to an 9648 // incomplete type, other than [cv] void*. 9649 // N2844 forbids rvalue references. 9650 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 9651 Diag(Loc, diag::err_catch_rvalue_ref); 9652 Invalid = true; 9653 } 9654 9655 QualType BaseType = ExDeclType; 9656 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 9657 unsigned DK = diag::err_catch_incomplete; 9658 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 9659 BaseType = Ptr->getPointeeType(); 9660 Mode = 1; 9661 DK = diag::err_catch_incomplete_ptr; 9662 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 9663 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 9664 BaseType = Ref->getPointeeType(); 9665 Mode = 2; 9666 DK = diag::err_catch_incomplete_ref; 9667 } 9668 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 9669 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK)) 9670 Invalid = true; 9671 9672 if (!Invalid && !ExDeclType->isDependentType() && 9673 RequireNonAbstractType(Loc, ExDeclType, 9674 diag::err_abstract_type_in_decl, 9675 AbstractVariableType)) 9676 Invalid = true; 9677 9678 // Only the non-fragile NeXT runtime currently supports C++ catches 9679 // of ObjC types, and no runtime supports catching ObjC types by value. 9680 if (!Invalid && getLangOpts().ObjC1) { 9681 QualType T = ExDeclType; 9682 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 9683 T = RT->getPointeeType(); 9684 9685 if (T->isObjCObjectType()) { 9686 Diag(Loc, diag::err_objc_object_catch); 9687 Invalid = true; 9688 } else if (T->isObjCObjectPointerType()) { 9689 // FIXME: should this be a test for macosx-fragile specifically? 9690 if (getLangOpts().ObjCRuntime.isFragile()) 9691 Diag(Loc, diag::warn_objc_pointer_cxx_catch_fragile); 9692 } 9693 } 9694 9695 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, StartLoc, Loc, Name, 9696 ExDeclType, TInfo, SC_None, SC_None); 9697 ExDecl->setExceptionVariable(true); 9698 9699 // In ARC, infer 'retaining' for variables of retainable type. 9700 if (getLangOpts().ObjCAutoRefCount && inferObjCARCLifetime(ExDecl)) 9701 Invalid = true; 9702 9703 if (!Invalid && !ExDeclType->isDependentType()) { 9704 if (const RecordType *recordType = ExDeclType->getAs<RecordType>()) { 9705 // C++ [except.handle]p16: 9706 // The object declared in an exception-declaration or, if the 9707 // exception-declaration does not specify a name, a temporary (12.2) is 9708 // copy-initialized (8.5) from the exception object. [...] 9709 // The object is destroyed when the handler exits, after the destruction 9710 // of any automatic objects initialized within the handler. 9711 // 9712 // We just pretend to initialize the object with itself, then make sure 9713 // it can be destroyed later. 9714 QualType initType = ExDeclType; 9715 9716 InitializedEntity entity = 9717 InitializedEntity::InitializeVariable(ExDecl); 9718 InitializationKind initKind = 9719 InitializationKind::CreateCopy(Loc, SourceLocation()); 9720 9721 Expr *opaqueValue = 9722 new (Context) OpaqueValueExpr(Loc, initType, VK_LValue, OK_Ordinary); 9723 InitializationSequence sequence(*this, entity, initKind, &opaqueValue, 1); 9724 ExprResult result = sequence.Perform(*this, entity, initKind, 9725 MultiExprArg(&opaqueValue, 1)); 9726 if (result.isInvalid()) 9727 Invalid = true; 9728 else { 9729 // If the constructor used was non-trivial, set this as the 9730 // "initializer". 9731 CXXConstructExpr *construct = cast<CXXConstructExpr>(result.take()); 9732 if (!construct->getConstructor()->isTrivial()) { 9733 Expr *init = MaybeCreateExprWithCleanups(construct); 9734 ExDecl->setInit(init); 9735 } 9736 9737 // And make sure it's destructable. 9738 FinalizeVarWithDestructor(ExDecl, recordType); 9739 } 9740 } 9741 } 9742 9743 if (Invalid) 9744 ExDecl->setInvalidDecl(); 9745 9746 return ExDecl; 9747} 9748 9749/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 9750/// handler. 9751Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 9752 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 9753 bool Invalid = D.isInvalidType(); 9754 9755 // Check for unexpanded parameter packs. 9756 if (TInfo && DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 9757 UPPC_ExceptionType)) { 9758 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 9759 D.getIdentifierLoc()); 9760 Invalid = true; 9761 } 9762 9763 IdentifierInfo *II = D.getIdentifier(); 9764 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 9765 LookupOrdinaryName, 9766 ForRedeclaration)) { 9767 // The scope should be freshly made just for us. There is just no way 9768 // it contains any previous declaration. 9769 assert(!S->isDeclScope(PrevDecl)); 9770 if (PrevDecl->isTemplateParameter()) { 9771 // Maybe we will complain about the shadowed template parameter. 9772 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 9773 PrevDecl = 0; 9774 } 9775 } 9776 9777 if (D.getCXXScopeSpec().isSet() && !Invalid) { 9778 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 9779 << D.getCXXScopeSpec().getRange(); 9780 Invalid = true; 9781 } 9782 9783 VarDecl *ExDecl = BuildExceptionDeclaration(S, TInfo, 9784 D.getLocStart(), 9785 D.getIdentifierLoc(), 9786 D.getIdentifier()); 9787 if (Invalid) 9788 ExDecl->setInvalidDecl(); 9789 9790 // Add the exception declaration into this scope. 9791 if (II) 9792 PushOnScopeChains(ExDecl, S); 9793 else 9794 CurContext->addDecl(ExDecl); 9795 9796 ProcessDeclAttributes(S, ExDecl, D); 9797 return ExDecl; 9798} 9799 9800Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation StaticAssertLoc, 9801 Expr *AssertExpr, 9802 Expr *AssertMessageExpr, 9803 SourceLocation RParenLoc) { 9804 StringLiteral *AssertMessage = cast<StringLiteral>(AssertMessageExpr); 9805 9806 if (DiagnoseUnexpandedParameterPack(AssertExpr, UPPC_StaticAssertExpression)) 9807 return 0; 9808 9809 return BuildStaticAssertDeclaration(StaticAssertLoc, AssertExpr, 9810 AssertMessage, RParenLoc, false); 9811} 9812 9813Decl *Sema::BuildStaticAssertDeclaration(SourceLocation StaticAssertLoc, 9814 Expr *AssertExpr, 9815 StringLiteral *AssertMessage, 9816 SourceLocation RParenLoc, 9817 bool Failed) { 9818 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent() && 9819 !Failed) { 9820 // In a static_assert-declaration, the constant-expression shall be a 9821 // constant expression that can be contextually converted to bool. 9822 ExprResult Converted = PerformContextuallyConvertToBool(AssertExpr); 9823 if (Converted.isInvalid()) 9824 Failed = true; 9825 9826 llvm::APSInt Cond; 9827 if (!Failed && VerifyIntegerConstantExpression(Converted.get(), &Cond, 9828 diag::err_static_assert_expression_is_not_constant, 9829 /*AllowFold=*/false).isInvalid()) 9830 Failed = true; 9831 9832 if (!Failed && !Cond) { 9833 llvm::SmallString<256> MsgBuffer; 9834 llvm::raw_svector_ostream Msg(MsgBuffer); 9835 AssertMessage->printPretty(Msg, 0, getPrintingPolicy()); 9836 Diag(StaticAssertLoc, diag::err_static_assert_failed) 9837 << Msg.str() << AssertExpr->getSourceRange(); 9838 Failed = true; 9839 } 9840 } 9841 9842 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, StaticAssertLoc, 9843 AssertExpr, AssertMessage, RParenLoc, 9844 Failed); 9845 9846 CurContext->addDecl(Decl); 9847 return Decl; 9848} 9849 9850/// \brief Perform semantic analysis of the given friend type declaration. 9851/// 9852/// \returns A friend declaration that. 9853FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation LocStart, 9854 SourceLocation FriendLoc, 9855 TypeSourceInfo *TSInfo) { 9856 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 9857 9858 QualType T = TSInfo->getType(); 9859 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 9860 9861 // C++03 [class.friend]p2: 9862 // An elaborated-type-specifier shall be used in a friend declaration 9863 // for a class.* 9864 // 9865 // * The class-key of the elaborated-type-specifier is required. 9866 if (!ActiveTemplateInstantiations.empty()) { 9867 // Do not complain about the form of friend template types during 9868 // template instantiation; we will already have complained when the 9869 // template was declared. 9870 } else if (!T->isElaboratedTypeSpecifier()) { 9871 // If we evaluated the type to a record type, suggest putting 9872 // a tag in front. 9873 if (const RecordType *RT = T->getAs<RecordType>()) { 9874 RecordDecl *RD = RT->getDecl(); 9875 9876 std::string InsertionText = std::string(" ") + RD->getKindName(); 9877 9878 Diag(TypeRange.getBegin(), 9879 getLangOpts().CPlusPlus0x ? 9880 diag::warn_cxx98_compat_unelaborated_friend_type : 9881 diag::ext_unelaborated_friend_type) 9882 << (unsigned) RD->getTagKind() 9883 << T 9884 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 9885 InsertionText); 9886 } else { 9887 Diag(FriendLoc, 9888 getLangOpts().CPlusPlus0x ? 9889 diag::warn_cxx98_compat_nonclass_type_friend : 9890 diag::ext_nonclass_type_friend) 9891 << T 9892 << TypeRange; 9893 } 9894 } else if (T->getAs<EnumType>()) { 9895 Diag(FriendLoc, 9896 getLangOpts().CPlusPlus0x ? 9897 diag::warn_cxx98_compat_enum_friend : 9898 diag::ext_enum_friend) 9899 << T 9900 << TypeRange; 9901 } 9902 9903 // C++11 [class.friend]p3: 9904 // A friend declaration that does not declare a function shall have one 9905 // of the following forms: 9906 // friend elaborated-type-specifier ; 9907 // friend simple-type-specifier ; 9908 // friend typename-specifier ; 9909 if (getLangOpts().CPlusPlus0x && LocStart != FriendLoc) 9910 Diag(FriendLoc, diag::err_friend_not_first_in_declaration) << T; 9911 9912 // If the type specifier in a friend declaration designates a (possibly 9913 // cv-qualified) class type, that class is declared as a friend; otherwise, 9914 // the friend declaration is ignored. 9915 return FriendDecl::Create(Context, CurContext, LocStart, TSInfo, FriendLoc); 9916} 9917 9918/// Handle a friend tag declaration where the scope specifier was 9919/// templated. 9920Decl *Sema::ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc, 9921 unsigned TagSpec, SourceLocation TagLoc, 9922 CXXScopeSpec &SS, 9923 IdentifierInfo *Name, SourceLocation NameLoc, 9924 AttributeList *Attr, 9925 MultiTemplateParamsArg TempParamLists) { 9926 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 9927 9928 bool isExplicitSpecialization = false; 9929 bool Invalid = false; 9930 9931 if (TemplateParameterList *TemplateParams 9932 = MatchTemplateParametersToScopeSpecifier(TagLoc, NameLoc, SS, 9933 TempParamLists.data(), 9934 TempParamLists.size(), 9935 /*friend*/ true, 9936 isExplicitSpecialization, 9937 Invalid)) { 9938 if (TemplateParams->size() > 0) { 9939 // This is a declaration of a class template. 9940 if (Invalid) 9941 return 0; 9942 9943 return CheckClassTemplate(S, TagSpec, TUK_Friend, TagLoc, 9944 SS, Name, NameLoc, Attr, 9945 TemplateParams, AS_public, 9946 /*ModulePrivateLoc=*/SourceLocation(), 9947 TempParamLists.size() - 1, 9948 TempParamLists.data()).take(); 9949 } else { 9950 // The "template<>" header is extraneous. 9951 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 9952 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 9953 isExplicitSpecialization = true; 9954 } 9955 } 9956 9957 if (Invalid) return 0; 9958 9959 bool isAllExplicitSpecializations = true; 9960 for (unsigned I = TempParamLists.size(); I-- > 0; ) { 9961 if (TempParamLists[I]->size()) { 9962 isAllExplicitSpecializations = false; 9963 break; 9964 } 9965 } 9966 9967 // FIXME: don't ignore attributes. 9968 9969 // If it's explicit specializations all the way down, just forget 9970 // about the template header and build an appropriate non-templated 9971 // friend. TODO: for source fidelity, remember the headers. 9972 if (isAllExplicitSpecializations) { 9973 if (SS.isEmpty()) { 9974 bool Owned = false; 9975 bool IsDependent = false; 9976 return ActOnTag(S, TagSpec, TUK_Friend, TagLoc, SS, Name, NameLoc, 9977 Attr, AS_public, 9978 /*ModulePrivateLoc=*/SourceLocation(), 9979 MultiTemplateParamsArg(), Owned, IsDependent, 9980 /*ScopedEnumKWLoc=*/SourceLocation(), 9981 /*ScopedEnumUsesClassTag=*/false, 9982 /*UnderlyingType=*/TypeResult()); 9983 } 9984 9985 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 9986 ElaboratedTypeKeyword Keyword 9987 = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 9988 QualType T = CheckTypenameType(Keyword, TagLoc, QualifierLoc, 9989 *Name, NameLoc); 9990 if (T.isNull()) 9991 return 0; 9992 9993 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 9994 if (isa<DependentNameType>(T)) { 9995 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 9996 TL.setElaboratedKeywordLoc(TagLoc); 9997 TL.setQualifierLoc(QualifierLoc); 9998 TL.setNameLoc(NameLoc); 9999 } else { 10000 ElaboratedTypeLoc TL = cast<ElaboratedTypeLoc>(TSI->getTypeLoc()); 10001 TL.setElaboratedKeywordLoc(TagLoc); 10002 TL.setQualifierLoc(QualifierLoc); 10003 cast<TypeSpecTypeLoc>(TL.getNamedTypeLoc()).setNameLoc(NameLoc); 10004 } 10005 10006 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 10007 TSI, FriendLoc); 10008 Friend->setAccess(AS_public); 10009 CurContext->addDecl(Friend); 10010 return Friend; 10011 } 10012 10013 assert(SS.isNotEmpty() && "valid templated tag with no SS and no direct?"); 10014 10015 10016 10017 // Handle the case of a templated-scope friend class. e.g. 10018 // template <class T> class A<T>::B; 10019 // FIXME: we don't support these right now. 10020 ElaboratedTypeKeyword ETK = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 10021 QualType T = Context.getDependentNameType(ETK, SS.getScopeRep(), Name); 10022 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 10023 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 10024 TL.setElaboratedKeywordLoc(TagLoc); 10025 TL.setQualifierLoc(SS.getWithLocInContext(Context)); 10026 TL.setNameLoc(NameLoc); 10027 10028 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 10029 TSI, FriendLoc); 10030 Friend->setAccess(AS_public); 10031 Friend->setUnsupportedFriend(true); 10032 CurContext->addDecl(Friend); 10033 return Friend; 10034} 10035 10036 10037/// Handle a friend type declaration. This works in tandem with 10038/// ActOnTag. 10039/// 10040/// Notes on friend class templates: 10041/// 10042/// We generally treat friend class declarations as if they were 10043/// declaring a class. So, for example, the elaborated type specifier 10044/// in a friend declaration is required to obey the restrictions of a 10045/// class-head (i.e. no typedefs in the scope chain), template 10046/// parameters are required to match up with simple template-ids, &c. 10047/// However, unlike when declaring a template specialization, it's 10048/// okay to refer to a template specialization without an empty 10049/// template parameter declaration, e.g. 10050/// friend class A<T>::B<unsigned>; 10051/// We permit this as a special case; if there are any template 10052/// parameters present at all, require proper matching, i.e. 10053/// template <> template \<class T> friend class A<int>::B; 10054Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 10055 MultiTemplateParamsArg TempParams) { 10056 SourceLocation Loc = DS.getLocStart(); 10057 10058 assert(DS.isFriendSpecified()); 10059 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 10060 10061 // Try to convert the decl specifier to a type. This works for 10062 // friend templates because ActOnTag never produces a ClassTemplateDecl 10063 // for a TUK_Friend. 10064 Declarator TheDeclarator(DS, Declarator::MemberContext); 10065 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 10066 QualType T = TSI->getType(); 10067 if (TheDeclarator.isInvalidType()) 10068 return 0; 10069 10070 if (DiagnoseUnexpandedParameterPack(Loc, TSI, UPPC_FriendDeclaration)) 10071 return 0; 10072 10073 // This is definitely an error in C++98. It's probably meant to 10074 // be forbidden in C++0x, too, but the specification is just 10075 // poorly written. 10076 // 10077 // The problem is with declarations like the following: 10078 // template <T> friend A<T>::foo; 10079 // where deciding whether a class C is a friend or not now hinges 10080 // on whether there exists an instantiation of A that causes 10081 // 'foo' to equal C. There are restrictions on class-heads 10082 // (which we declare (by fiat) elaborated friend declarations to 10083 // be) that makes this tractable. 10084 // 10085 // FIXME: handle "template <> friend class A<T>;", which 10086 // is possibly well-formed? Who even knows? 10087 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 10088 Diag(Loc, diag::err_tagless_friend_type_template) 10089 << DS.getSourceRange(); 10090 return 0; 10091 } 10092 10093 // C++98 [class.friend]p1: A friend of a class is a function 10094 // or class that is not a member of the class . . . 10095 // This is fixed in DR77, which just barely didn't make the C++03 10096 // deadline. It's also a very silly restriction that seriously 10097 // affects inner classes and which nobody else seems to implement; 10098 // thus we never diagnose it, not even in -pedantic. 10099 // 10100 // But note that we could warn about it: it's always useless to 10101 // friend one of your own members (it's not, however, worthless to 10102 // friend a member of an arbitrary specialization of your template). 10103 10104 Decl *D; 10105 if (unsigned NumTempParamLists = TempParams.size()) 10106 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 10107 NumTempParamLists, 10108 TempParams.data(), 10109 TSI, 10110 DS.getFriendSpecLoc()); 10111 else 10112 D = CheckFriendTypeDecl(Loc, DS.getFriendSpecLoc(), TSI); 10113 10114 if (!D) 10115 return 0; 10116 10117 D->setAccess(AS_public); 10118 CurContext->addDecl(D); 10119 10120 return D; 10121} 10122 10123Decl *Sema::ActOnFriendFunctionDecl(Scope *S, Declarator &D, 10124 MultiTemplateParamsArg TemplateParams) { 10125 const DeclSpec &DS = D.getDeclSpec(); 10126 10127 assert(DS.isFriendSpecified()); 10128 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 10129 10130 SourceLocation Loc = D.getIdentifierLoc(); 10131 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 10132 10133 // C++ [class.friend]p1 10134 // A friend of a class is a function or class.... 10135 // Note that this sees through typedefs, which is intended. 10136 // It *doesn't* see through dependent types, which is correct 10137 // according to [temp.arg.type]p3: 10138 // If a declaration acquires a function type through a 10139 // type dependent on a template-parameter and this causes 10140 // a declaration that does not use the syntactic form of a 10141 // function declarator to have a function type, the program 10142 // is ill-formed. 10143 if (!TInfo->getType()->isFunctionType()) { 10144 Diag(Loc, diag::err_unexpected_friend); 10145 10146 // It might be worthwhile to try to recover by creating an 10147 // appropriate declaration. 10148 return 0; 10149 } 10150 10151 // C++ [namespace.memdef]p3 10152 // - If a friend declaration in a non-local class first declares a 10153 // class or function, the friend class or function is a member 10154 // of the innermost enclosing namespace. 10155 // - The name of the friend is not found by simple name lookup 10156 // until a matching declaration is provided in that namespace 10157 // scope (either before or after the class declaration granting 10158 // friendship). 10159 // - If a friend function is called, its name may be found by the 10160 // name lookup that considers functions from namespaces and 10161 // classes associated with the types of the function arguments. 10162 // - When looking for a prior declaration of a class or a function 10163 // declared as a friend, scopes outside the innermost enclosing 10164 // namespace scope are not considered. 10165 10166 CXXScopeSpec &SS = D.getCXXScopeSpec(); 10167 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 10168 DeclarationName Name = NameInfo.getName(); 10169 assert(Name); 10170 10171 // Check for unexpanded parameter packs. 10172 if (DiagnoseUnexpandedParameterPack(Loc, TInfo, UPPC_FriendDeclaration) || 10173 DiagnoseUnexpandedParameterPack(NameInfo, UPPC_FriendDeclaration) || 10174 DiagnoseUnexpandedParameterPack(SS, UPPC_FriendDeclaration)) 10175 return 0; 10176 10177 // The context we found the declaration in, or in which we should 10178 // create the declaration. 10179 DeclContext *DC; 10180 Scope *DCScope = S; 10181 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 10182 ForRedeclaration); 10183 10184 // FIXME: there are different rules in local classes 10185 10186 // There are four cases here. 10187 // - There's no scope specifier, in which case we just go to the 10188 // appropriate scope and look for a function or function template 10189 // there as appropriate. 10190 // Recover from invalid scope qualifiers as if they just weren't there. 10191 if (SS.isInvalid() || !SS.isSet()) { 10192 // C++0x [namespace.memdef]p3: 10193 // If the name in a friend declaration is neither qualified nor 10194 // a template-id and the declaration is a function or an 10195 // elaborated-type-specifier, the lookup to determine whether 10196 // the entity has been previously declared shall not consider 10197 // any scopes outside the innermost enclosing namespace. 10198 // C++0x [class.friend]p11: 10199 // If a friend declaration appears in a local class and the name 10200 // specified is an unqualified name, a prior declaration is 10201 // looked up without considering scopes that are outside the 10202 // innermost enclosing non-class scope. For a friend function 10203 // declaration, if there is no prior declaration, the program is 10204 // ill-formed. 10205 bool isLocal = cast<CXXRecordDecl>(CurContext)->isLocalClass(); 10206 bool isTemplateId = D.getName().getKind() == UnqualifiedId::IK_TemplateId; 10207 10208 // Find the appropriate context according to the above. 10209 DC = CurContext; 10210 while (true) { 10211 // Skip class contexts. If someone can cite chapter and verse 10212 // for this behavior, that would be nice --- it's what GCC and 10213 // EDG do, and it seems like a reasonable intent, but the spec 10214 // really only says that checks for unqualified existing 10215 // declarations should stop at the nearest enclosing namespace, 10216 // not that they should only consider the nearest enclosing 10217 // namespace. 10218 while (DC->isRecord() || DC->isTransparentContext()) 10219 DC = DC->getParent(); 10220 10221 LookupQualifiedName(Previous, DC); 10222 10223 // TODO: decide what we think about using declarations. 10224 if (isLocal || !Previous.empty()) 10225 break; 10226 10227 if (isTemplateId) { 10228 if (isa<TranslationUnitDecl>(DC)) break; 10229 } else { 10230 if (DC->isFileContext()) break; 10231 } 10232 DC = DC->getParent(); 10233 } 10234 10235 // C++ [class.friend]p1: A friend of a class is a function or 10236 // class that is not a member of the class . . . 10237 // C++11 changes this for both friend types and functions. 10238 // Most C++ 98 compilers do seem to give an error here, so 10239 // we do, too. 10240 if (!Previous.empty() && DC->Equals(CurContext)) 10241 Diag(DS.getFriendSpecLoc(), 10242 getLangOpts().CPlusPlus0x ? 10243 diag::warn_cxx98_compat_friend_is_member : 10244 diag::err_friend_is_member); 10245 10246 DCScope = getScopeForDeclContext(S, DC); 10247 10248 // C++ [class.friend]p6: 10249 // A function can be defined in a friend declaration of a class if and 10250 // only if the class is a non-local class (9.8), the function name is 10251 // unqualified, and the function has namespace scope. 10252 if (isLocal && D.isFunctionDefinition()) { 10253 Diag(NameInfo.getBeginLoc(), diag::err_friend_def_in_local_class); 10254 } 10255 10256 // - There's a non-dependent scope specifier, in which case we 10257 // compute it and do a previous lookup there for a function 10258 // or function template. 10259 } else if (!SS.getScopeRep()->isDependent()) { 10260 DC = computeDeclContext(SS); 10261 if (!DC) return 0; 10262 10263 if (RequireCompleteDeclContext(SS, DC)) return 0; 10264 10265 LookupQualifiedName(Previous, DC); 10266 10267 // Ignore things found implicitly in the wrong scope. 10268 // TODO: better diagnostics for this case. Suggesting the right 10269 // qualified scope would be nice... 10270 LookupResult::Filter F = Previous.makeFilter(); 10271 while (F.hasNext()) { 10272 NamedDecl *D = F.next(); 10273 if (!DC->InEnclosingNamespaceSetOf( 10274 D->getDeclContext()->getRedeclContext())) 10275 F.erase(); 10276 } 10277 F.done(); 10278 10279 if (Previous.empty()) { 10280 D.setInvalidType(); 10281 Diag(Loc, diag::err_qualified_friend_not_found) 10282 << Name << TInfo->getType(); 10283 return 0; 10284 } 10285 10286 // C++ [class.friend]p1: A friend of a class is a function or 10287 // class that is not a member of the class . . . 10288 if (DC->Equals(CurContext)) 10289 Diag(DS.getFriendSpecLoc(), 10290 getLangOpts().CPlusPlus0x ? 10291 diag::warn_cxx98_compat_friend_is_member : 10292 diag::err_friend_is_member); 10293 10294 if (D.isFunctionDefinition()) { 10295 // C++ [class.friend]p6: 10296 // A function can be defined in a friend declaration of a class if and 10297 // only if the class is a non-local class (9.8), the function name is 10298 // unqualified, and the function has namespace scope. 10299 SemaDiagnosticBuilder DB 10300 = Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def); 10301 10302 DB << SS.getScopeRep(); 10303 if (DC->isFileContext()) 10304 DB << FixItHint::CreateRemoval(SS.getRange()); 10305 SS.clear(); 10306 } 10307 10308 // - There's a scope specifier that does not match any template 10309 // parameter lists, in which case we use some arbitrary context, 10310 // create a method or method template, and wait for instantiation. 10311 // - There's a scope specifier that does match some template 10312 // parameter lists, which we don't handle right now. 10313 } else { 10314 if (D.isFunctionDefinition()) { 10315 // C++ [class.friend]p6: 10316 // A function can be defined in a friend declaration of a class if and 10317 // only if the class is a non-local class (9.8), the function name is 10318 // unqualified, and the function has namespace scope. 10319 Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def) 10320 << SS.getScopeRep(); 10321 } 10322 10323 DC = CurContext; 10324 assert(isa<CXXRecordDecl>(DC) && "friend declaration not in class?"); 10325 } 10326 10327 if (!DC->isRecord()) { 10328 // This implies that it has to be an operator or function. 10329 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 10330 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 10331 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 10332 Diag(Loc, diag::err_introducing_special_friend) << 10333 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 10334 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 10335 return 0; 10336 } 10337 } 10338 10339 // FIXME: This is an egregious hack to cope with cases where the scope stack 10340 // does not contain the declaration context, i.e., in an out-of-line 10341 // definition of a class. 10342 Scope FakeDCScope(S, Scope::DeclScope, Diags); 10343 if (!DCScope) { 10344 FakeDCScope.setEntity(DC); 10345 DCScope = &FakeDCScope; 10346 } 10347 10348 bool AddToScope = true; 10349 NamedDecl *ND = ActOnFunctionDeclarator(DCScope, D, DC, TInfo, Previous, 10350 TemplateParams, AddToScope); 10351 if (!ND) return 0; 10352 10353 assert(ND->getDeclContext() == DC); 10354 assert(ND->getLexicalDeclContext() == CurContext); 10355 10356 // Add the function declaration to the appropriate lookup tables, 10357 // adjusting the redeclarations list as necessary. We don't 10358 // want to do this yet if the friending class is dependent. 10359 // 10360 // Also update the scope-based lookup if the target context's 10361 // lookup context is in lexical scope. 10362 if (!CurContext->isDependentContext()) { 10363 DC = DC->getRedeclContext(); 10364 DC->makeDeclVisibleInContext(ND); 10365 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 10366 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 10367 } 10368 10369 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 10370 D.getIdentifierLoc(), ND, 10371 DS.getFriendSpecLoc()); 10372 FrD->setAccess(AS_public); 10373 CurContext->addDecl(FrD); 10374 10375 if (ND->isInvalidDecl()) { 10376 FrD->setInvalidDecl(); 10377 } else { 10378 if (DC->isRecord()) CheckFriendAccess(ND); 10379 10380 FunctionDecl *FD; 10381 if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(ND)) 10382 FD = FTD->getTemplatedDecl(); 10383 else 10384 FD = cast<FunctionDecl>(ND); 10385 10386 // Mark templated-scope function declarations as unsupported. 10387 if (FD->getNumTemplateParameterLists()) 10388 FrD->setUnsupportedFriend(true); 10389 } 10390 10391 return ND; 10392} 10393 10394void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) { 10395 AdjustDeclIfTemplate(Dcl); 10396 10397 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 10398 if (!Fn) { 10399 Diag(DelLoc, diag::err_deleted_non_function); 10400 return; 10401 } 10402 if (const FunctionDecl *Prev = Fn->getPreviousDecl()) { 10403 // Don't consider the implicit declaration we generate for explicit 10404 // specializations. FIXME: Do not generate these implicit declarations. 10405 if ((Prev->getTemplateSpecializationKind() != TSK_ExplicitSpecialization 10406 || Prev->getPreviousDecl()) && !Prev->isDefined()) { 10407 Diag(DelLoc, diag::err_deleted_decl_not_first); 10408 Diag(Prev->getLocation(), diag::note_previous_declaration); 10409 } 10410 // If the declaration wasn't the first, we delete the function anyway for 10411 // recovery. 10412 } 10413 Fn->setDeletedAsWritten(); 10414 10415 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Dcl); 10416 if (!MD) 10417 return; 10418 10419 // A deleted special member function is trivial if the corresponding 10420 // implicitly-declared function would have been. 10421 switch (getSpecialMember(MD)) { 10422 case CXXInvalid: 10423 break; 10424 case CXXDefaultConstructor: 10425 MD->setTrivial(MD->getParent()->hasTrivialDefaultConstructor()); 10426 break; 10427 case CXXCopyConstructor: 10428 MD->setTrivial(MD->getParent()->hasTrivialCopyConstructor()); 10429 break; 10430 case CXXMoveConstructor: 10431 MD->setTrivial(MD->getParent()->hasTrivialMoveConstructor()); 10432 break; 10433 case CXXCopyAssignment: 10434 MD->setTrivial(MD->getParent()->hasTrivialCopyAssignment()); 10435 break; 10436 case CXXMoveAssignment: 10437 MD->setTrivial(MD->getParent()->hasTrivialMoveAssignment()); 10438 break; 10439 case CXXDestructor: 10440 MD->setTrivial(MD->getParent()->hasTrivialDestructor()); 10441 break; 10442 } 10443} 10444 10445void Sema::SetDeclDefaulted(Decl *Dcl, SourceLocation DefaultLoc) { 10446 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Dcl); 10447 10448 if (MD) { 10449 if (MD->getParent()->isDependentType()) { 10450 MD->setDefaulted(); 10451 MD->setExplicitlyDefaulted(); 10452 return; 10453 } 10454 10455 CXXSpecialMember Member = getSpecialMember(MD); 10456 if (Member == CXXInvalid) { 10457 Diag(DefaultLoc, diag::err_default_special_members); 10458 return; 10459 } 10460 10461 MD->setDefaulted(); 10462 MD->setExplicitlyDefaulted(); 10463 10464 // If this definition appears within the record, do the checking when 10465 // the record is complete. 10466 const FunctionDecl *Primary = MD; 10467 if (const FunctionDecl *Pattern = MD->getTemplateInstantiationPattern()) 10468 // Find the uninstantiated declaration that actually had the '= default' 10469 // on it. 10470 Pattern->isDefined(Primary); 10471 10472 if (Primary == Primary->getCanonicalDecl()) 10473 return; 10474 10475 CheckExplicitlyDefaultedSpecialMember(MD); 10476 10477 switch (Member) { 10478 case CXXDefaultConstructor: { 10479 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10480 if (!CD->isInvalidDecl()) 10481 DefineImplicitDefaultConstructor(DefaultLoc, CD); 10482 break; 10483 } 10484 10485 case CXXCopyConstructor: { 10486 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10487 if (!CD->isInvalidDecl()) 10488 DefineImplicitCopyConstructor(DefaultLoc, CD); 10489 break; 10490 } 10491 10492 case CXXCopyAssignment: { 10493 if (!MD->isInvalidDecl()) 10494 DefineImplicitCopyAssignment(DefaultLoc, MD); 10495 break; 10496 } 10497 10498 case CXXDestructor: { 10499 CXXDestructorDecl *DD = cast<CXXDestructorDecl>(MD); 10500 if (!DD->isInvalidDecl()) 10501 DefineImplicitDestructor(DefaultLoc, DD); 10502 break; 10503 } 10504 10505 case CXXMoveConstructor: { 10506 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10507 if (!CD->isInvalidDecl()) 10508 DefineImplicitMoveConstructor(DefaultLoc, CD); 10509 break; 10510 } 10511 10512 case CXXMoveAssignment: { 10513 if (!MD->isInvalidDecl()) 10514 DefineImplicitMoveAssignment(DefaultLoc, MD); 10515 break; 10516 } 10517 10518 case CXXInvalid: 10519 llvm_unreachable("Invalid special member."); 10520 } 10521 } else { 10522 Diag(DefaultLoc, diag::err_default_special_members); 10523 } 10524} 10525 10526static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 10527 for (Stmt::child_range CI = S->children(); CI; ++CI) { 10528 Stmt *SubStmt = *CI; 10529 if (!SubStmt) 10530 continue; 10531 if (isa<ReturnStmt>(SubStmt)) 10532 Self.Diag(SubStmt->getLocStart(), 10533 diag::err_return_in_constructor_handler); 10534 if (!isa<Expr>(SubStmt)) 10535 SearchForReturnInStmt(Self, SubStmt); 10536 } 10537} 10538 10539void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 10540 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 10541 CXXCatchStmt *Handler = TryBlock->getHandler(I); 10542 SearchForReturnInStmt(*this, Handler); 10543 } 10544} 10545 10546bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 10547 const CXXMethodDecl *Old) { 10548 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 10549 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 10550 10551 if (Context.hasSameType(NewTy, OldTy) || 10552 NewTy->isDependentType() || OldTy->isDependentType()) 10553 return false; 10554 10555 // Check if the return types are covariant 10556 QualType NewClassTy, OldClassTy; 10557 10558 /// Both types must be pointers or references to classes. 10559 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 10560 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 10561 NewClassTy = NewPT->getPointeeType(); 10562 OldClassTy = OldPT->getPointeeType(); 10563 } 10564 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 10565 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 10566 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 10567 NewClassTy = NewRT->getPointeeType(); 10568 OldClassTy = OldRT->getPointeeType(); 10569 } 10570 } 10571 } 10572 10573 // The return types aren't either both pointers or references to a class type. 10574 if (NewClassTy.isNull()) { 10575 Diag(New->getLocation(), 10576 diag::err_different_return_type_for_overriding_virtual_function) 10577 << New->getDeclName() << NewTy << OldTy; 10578 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10579 10580 return true; 10581 } 10582 10583 // C++ [class.virtual]p6: 10584 // If the return type of D::f differs from the return type of B::f, the 10585 // class type in the return type of D::f shall be complete at the point of 10586 // declaration of D::f or shall be the class type D. 10587 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 10588 if (!RT->isBeingDefined() && 10589 RequireCompleteType(New->getLocation(), NewClassTy, 10590 diag::err_covariant_return_incomplete, 10591 New->getDeclName())) 10592 return true; 10593 } 10594 10595 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 10596 // Check if the new class derives from the old class. 10597 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 10598 Diag(New->getLocation(), 10599 diag::err_covariant_return_not_derived) 10600 << New->getDeclName() << NewTy << OldTy; 10601 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10602 return true; 10603 } 10604 10605 // Check if we the conversion from derived to base is valid. 10606 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 10607 diag::err_covariant_return_inaccessible_base, 10608 diag::err_covariant_return_ambiguous_derived_to_base_conv, 10609 // FIXME: Should this point to the return type? 10610 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 10611 // FIXME: this note won't trigger for delayed access control 10612 // diagnostics, and it's impossible to get an undelayed error 10613 // here from access control during the original parse because 10614 // the ParsingDeclSpec/ParsingDeclarator are still in scope. 10615 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10616 return true; 10617 } 10618 } 10619 10620 // The qualifiers of the return types must be the same. 10621 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 10622 Diag(New->getLocation(), 10623 diag::err_covariant_return_type_different_qualifications) 10624 << New->getDeclName() << NewTy << OldTy; 10625 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10626 return true; 10627 }; 10628 10629 10630 // The new class type must have the same or less qualifiers as the old type. 10631 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 10632 Diag(New->getLocation(), 10633 diag::err_covariant_return_type_class_type_more_qualified) 10634 << New->getDeclName() << NewTy << OldTy; 10635 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10636 return true; 10637 }; 10638 10639 return false; 10640} 10641 10642/// \brief Mark the given method pure. 10643/// 10644/// \param Method the method to be marked pure. 10645/// 10646/// \param InitRange the source range that covers the "0" initializer. 10647bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 10648 SourceLocation EndLoc = InitRange.getEnd(); 10649 if (EndLoc.isValid()) 10650 Method->setRangeEnd(EndLoc); 10651 10652 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 10653 Method->setPure(); 10654 return false; 10655 } 10656 10657 if (!Method->isInvalidDecl()) 10658 Diag(Method->getLocation(), diag::err_non_virtual_pure) 10659 << Method->getDeclName() << InitRange; 10660 return true; 10661} 10662 10663/// \brief Determine whether the given declaration is a static data member. 10664static bool isStaticDataMember(Decl *D) { 10665 VarDecl *Var = dyn_cast_or_null<VarDecl>(D); 10666 if (!Var) 10667 return false; 10668 10669 return Var->isStaticDataMember(); 10670} 10671/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 10672/// an initializer for the out-of-line declaration 'Dcl'. The scope 10673/// is a fresh scope pushed for just this purpose. 10674/// 10675/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 10676/// static data member of class X, names should be looked up in the scope of 10677/// class X. 10678void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) { 10679 // If there is no declaration, there was an error parsing it. 10680 if (D == 0 || D->isInvalidDecl()) return; 10681 10682 // We should only get called for declarations with scope specifiers, like: 10683 // int foo::bar; 10684 assert(D->isOutOfLine()); 10685 EnterDeclaratorContext(S, D->getDeclContext()); 10686 10687 // If we are parsing the initializer for a static data member, push a 10688 // new expression evaluation context that is associated with this static 10689 // data member. 10690 if (isStaticDataMember(D)) 10691 PushExpressionEvaluationContext(PotentiallyEvaluated, D); 10692} 10693 10694/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 10695/// initializer for the out-of-line declaration 'D'. 10696void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) { 10697 // If there is no declaration, there was an error parsing it. 10698 if (D == 0 || D->isInvalidDecl()) return; 10699 10700 if (isStaticDataMember(D)) 10701 PopExpressionEvaluationContext(); 10702 10703 assert(D->isOutOfLine()); 10704 ExitDeclaratorContext(S); 10705} 10706 10707/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 10708/// C++ if/switch/while/for statement. 10709/// e.g: "if (int x = f()) {...}" 10710DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 10711 // C++ 6.4p2: 10712 // The declarator shall not specify a function or an array. 10713 // The type-specifier-seq shall not contain typedef and shall not declare a 10714 // new class or enumeration. 10715 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 10716 "Parser allowed 'typedef' as storage class of condition decl."); 10717 10718 Decl *Dcl = ActOnDeclarator(S, D); 10719 if (!Dcl) 10720 return true; 10721 10722 if (isa<FunctionDecl>(Dcl)) { // The declarator shall not specify a function. 10723 Diag(Dcl->getLocation(), diag::err_invalid_use_of_function_type) 10724 << D.getSourceRange(); 10725 return true; 10726 } 10727 10728 return Dcl; 10729} 10730 10731void Sema::LoadExternalVTableUses() { 10732 if (!ExternalSource) 10733 return; 10734 10735 SmallVector<ExternalVTableUse, 4> VTables; 10736 ExternalSource->ReadUsedVTables(VTables); 10737 SmallVector<VTableUse, 4> NewUses; 10738 for (unsigned I = 0, N = VTables.size(); I != N; ++I) { 10739 llvm::DenseMap<CXXRecordDecl *, bool>::iterator Pos 10740 = VTablesUsed.find(VTables[I].Record); 10741 // Even if a definition wasn't required before, it may be required now. 10742 if (Pos != VTablesUsed.end()) { 10743 if (!Pos->second && VTables[I].DefinitionRequired) 10744 Pos->second = true; 10745 continue; 10746 } 10747 10748 VTablesUsed[VTables[I].Record] = VTables[I].DefinitionRequired; 10749 NewUses.push_back(VTableUse(VTables[I].Record, VTables[I].Location)); 10750 } 10751 10752 VTableUses.insert(VTableUses.begin(), NewUses.begin(), NewUses.end()); 10753} 10754 10755void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 10756 bool DefinitionRequired) { 10757 // Ignore any vtable uses in unevaluated operands or for classes that do 10758 // not have a vtable. 10759 if (!Class->isDynamicClass() || Class->isDependentContext() || 10760 CurContext->isDependentContext() || 10761 ExprEvalContexts.back().Context == Unevaluated) 10762 return; 10763 10764 // Try to insert this class into the map. 10765 LoadExternalVTableUses(); 10766 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 10767 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 10768 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 10769 if (!Pos.second) { 10770 // If we already had an entry, check to see if we are promoting this vtable 10771 // to required a definition. If so, we need to reappend to the VTableUses 10772 // list, since we may have already processed the first entry. 10773 if (DefinitionRequired && !Pos.first->second) { 10774 Pos.first->second = true; 10775 } else { 10776 // Otherwise, we can early exit. 10777 return; 10778 } 10779 } 10780 10781 // Local classes need to have their virtual members marked 10782 // immediately. For all other classes, we mark their virtual members 10783 // at the end of the translation unit. 10784 if (Class->isLocalClass()) 10785 MarkVirtualMembersReferenced(Loc, Class); 10786 else 10787 VTableUses.push_back(std::make_pair(Class, Loc)); 10788} 10789 10790bool Sema::DefineUsedVTables() { 10791 LoadExternalVTableUses(); 10792 if (VTableUses.empty()) 10793 return false; 10794 10795 // Note: The VTableUses vector could grow as a result of marking 10796 // the members of a class as "used", so we check the size each 10797 // time through the loop and prefer indices (which are stable) to 10798 // iterators (which are not). 10799 bool DefinedAnything = false; 10800 for (unsigned I = 0; I != VTableUses.size(); ++I) { 10801 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 10802 if (!Class) 10803 continue; 10804 10805 SourceLocation Loc = VTableUses[I].second; 10806 10807 bool DefineVTable = true; 10808 10809 // If this class has a key function, but that key function is 10810 // defined in another translation unit, we don't need to emit the 10811 // vtable even though we're using it. 10812 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class); 10813 if (KeyFunction && !KeyFunction->hasBody()) { 10814 switch (KeyFunction->getTemplateSpecializationKind()) { 10815 case TSK_Undeclared: 10816 case TSK_ExplicitSpecialization: 10817 case TSK_ExplicitInstantiationDeclaration: 10818 // The key function is in another translation unit. 10819 DefineVTable = false; 10820 break; 10821 10822 case TSK_ExplicitInstantiationDefinition: 10823 case TSK_ImplicitInstantiation: 10824 // We will be instantiating the key function. 10825 break; 10826 } 10827 } else if (!KeyFunction) { 10828 // If we have a class with no key function that is the subject 10829 // of an explicit instantiation declaration, suppress the 10830 // vtable; it will live with the explicit instantiation 10831 // definition. 10832 bool IsExplicitInstantiationDeclaration 10833 = Class->getTemplateSpecializationKind() 10834 == TSK_ExplicitInstantiationDeclaration; 10835 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 10836 REnd = Class->redecls_end(); 10837 R != REnd; ++R) { 10838 TemplateSpecializationKind TSK 10839 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 10840 if (TSK == TSK_ExplicitInstantiationDeclaration) 10841 IsExplicitInstantiationDeclaration = true; 10842 else if (TSK == TSK_ExplicitInstantiationDefinition) { 10843 IsExplicitInstantiationDeclaration = false; 10844 break; 10845 } 10846 } 10847 10848 if (IsExplicitInstantiationDeclaration) 10849 DefineVTable = false; 10850 } 10851 10852 // The exception specifications for all virtual members may be needed even 10853 // if we are not providing an authoritative form of the vtable in this TU. 10854 // We may choose to emit it available_externally anyway. 10855 if (!DefineVTable) { 10856 MarkVirtualMemberExceptionSpecsNeeded(Loc, Class); 10857 continue; 10858 } 10859 10860 // Mark all of the virtual members of this class as referenced, so 10861 // that we can build a vtable. Then, tell the AST consumer that a 10862 // vtable for this class is required. 10863 DefinedAnything = true; 10864 MarkVirtualMembersReferenced(Loc, Class); 10865 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 10866 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 10867 10868 // Optionally warn if we're emitting a weak vtable. 10869 if (Class->getLinkage() == ExternalLinkage && 10870 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 10871 const FunctionDecl *KeyFunctionDef = 0; 10872 if (!KeyFunction || 10873 (KeyFunction->hasBody(KeyFunctionDef) && 10874 KeyFunctionDef->isInlined())) 10875 Diag(Class->getLocation(), Class->getTemplateSpecializationKind() == 10876 TSK_ExplicitInstantiationDefinition 10877 ? diag::warn_weak_template_vtable : diag::warn_weak_vtable) 10878 << Class; 10879 } 10880 } 10881 VTableUses.clear(); 10882 10883 return DefinedAnything; 10884} 10885 10886void Sema::MarkVirtualMemberExceptionSpecsNeeded(SourceLocation Loc, 10887 const CXXRecordDecl *RD) { 10888 for (CXXRecordDecl::method_iterator I = RD->method_begin(), 10889 E = RD->method_end(); I != E; ++I) 10890 if ((*I)->isVirtual() && !(*I)->isPure()) 10891 ResolveExceptionSpec(Loc, (*I)->getType()->castAs<FunctionProtoType>()); 10892} 10893 10894void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 10895 const CXXRecordDecl *RD) { 10896 // Mark all functions which will appear in RD's vtable as used. 10897 CXXFinalOverriderMap FinalOverriders; 10898 RD->getFinalOverriders(FinalOverriders); 10899 for (CXXFinalOverriderMap::const_iterator I = FinalOverriders.begin(), 10900 E = FinalOverriders.end(); 10901 I != E; ++I) { 10902 for (OverridingMethods::const_iterator OI = I->second.begin(), 10903 OE = I->second.end(); 10904 OI != OE; ++OI) { 10905 assert(OI->second.size() > 0 && "no final overrider"); 10906 CXXMethodDecl *Overrider = OI->second.front().Method; 10907 10908 // C++ [basic.def.odr]p2: 10909 // [...] A virtual member function is used if it is not pure. [...] 10910 if (!Overrider->isPure()) 10911 MarkFunctionReferenced(Loc, Overrider); 10912 } 10913 } 10914 10915 // Only classes that have virtual bases need a VTT. 10916 if (RD->getNumVBases() == 0) 10917 return; 10918 10919 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 10920 e = RD->bases_end(); i != e; ++i) { 10921 const CXXRecordDecl *Base = 10922 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 10923 if (Base->getNumVBases() == 0) 10924 continue; 10925 MarkVirtualMembersReferenced(Loc, Base); 10926 } 10927} 10928 10929/// SetIvarInitializers - This routine builds initialization ASTs for the 10930/// Objective-C implementation whose ivars need be initialized. 10931void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 10932 if (!getLangOpts().CPlusPlus) 10933 return; 10934 if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 10935 SmallVector<ObjCIvarDecl*, 8> ivars; 10936 CollectIvarsToConstructOrDestruct(OID, ivars); 10937 if (ivars.empty()) 10938 return; 10939 SmallVector<CXXCtorInitializer*, 32> AllToInit; 10940 for (unsigned i = 0; i < ivars.size(); i++) { 10941 FieldDecl *Field = ivars[i]; 10942 if (Field->isInvalidDecl()) 10943 continue; 10944 10945 CXXCtorInitializer *Member; 10946 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 10947 InitializationKind InitKind = 10948 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 10949 10950 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 10951 ExprResult MemberInit = 10952 InitSeq.Perform(*this, InitEntity, InitKind, MultiExprArg()); 10953 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 10954 // Note, MemberInit could actually come back empty if no initialization 10955 // is required (e.g., because it would call a trivial default constructor) 10956 if (!MemberInit.get() || MemberInit.isInvalid()) 10957 continue; 10958 10959 Member = 10960 new (Context) CXXCtorInitializer(Context, Field, SourceLocation(), 10961 SourceLocation(), 10962 MemberInit.takeAs<Expr>(), 10963 SourceLocation()); 10964 AllToInit.push_back(Member); 10965 10966 // Be sure that the destructor is accessible and is marked as referenced. 10967 if (const RecordType *RecordTy 10968 = Context.getBaseElementType(Field->getType()) 10969 ->getAs<RecordType>()) { 10970 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 10971 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 10972 MarkFunctionReferenced(Field->getLocation(), Destructor); 10973 CheckDestructorAccess(Field->getLocation(), Destructor, 10974 PDiag(diag::err_access_dtor_ivar) 10975 << Context.getBaseElementType(Field->getType())); 10976 } 10977 } 10978 } 10979 ObjCImplementation->setIvarInitializers(Context, 10980 AllToInit.data(), AllToInit.size()); 10981 } 10982} 10983 10984static 10985void DelegatingCycleHelper(CXXConstructorDecl* Ctor, 10986 llvm::SmallSet<CXXConstructorDecl*, 4> &Valid, 10987 llvm::SmallSet<CXXConstructorDecl*, 4> &Invalid, 10988 llvm::SmallSet<CXXConstructorDecl*, 4> &Current, 10989 Sema &S) { 10990 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 10991 CE = Current.end(); 10992 if (Ctor->isInvalidDecl()) 10993 return; 10994 10995 CXXConstructorDecl *Target = Ctor->getTargetConstructor(); 10996 10997 // Target may not be determinable yet, for instance if this is a dependent 10998 // call in an uninstantiated template. 10999 if (Target) { 11000 const FunctionDecl *FNTarget = 0; 11001 (void)Target->hasBody(FNTarget); 11002 Target = const_cast<CXXConstructorDecl*>( 11003 cast_or_null<CXXConstructorDecl>(FNTarget)); 11004 } 11005 11006 CXXConstructorDecl *Canonical = Ctor->getCanonicalDecl(), 11007 // Avoid dereferencing a null pointer here. 11008 *TCanonical = Target ? Target->getCanonicalDecl() : 0; 11009 11010 if (!Current.insert(Canonical)) 11011 return; 11012 11013 // We know that beyond here, we aren't chaining into a cycle. 11014 if (!Target || !Target->isDelegatingConstructor() || 11015 Target->isInvalidDecl() || Valid.count(TCanonical)) { 11016 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 11017 Valid.insert(*CI); 11018 Current.clear(); 11019 // We've hit a cycle. 11020 } else if (TCanonical == Canonical || Invalid.count(TCanonical) || 11021 Current.count(TCanonical)) { 11022 // If we haven't diagnosed this cycle yet, do so now. 11023 if (!Invalid.count(TCanonical)) { 11024 S.Diag((*Ctor->init_begin())->getSourceLocation(), 11025 diag::warn_delegating_ctor_cycle) 11026 << Ctor; 11027 11028 // Don't add a note for a function delegating directly to itself. 11029 if (TCanonical != Canonical) 11030 S.Diag(Target->getLocation(), diag::note_it_delegates_to); 11031 11032 CXXConstructorDecl *C = Target; 11033 while (C->getCanonicalDecl() != Canonical) { 11034 const FunctionDecl *FNTarget = 0; 11035 (void)C->getTargetConstructor()->hasBody(FNTarget); 11036 assert(FNTarget && "Ctor cycle through bodiless function"); 11037 11038 C = const_cast<CXXConstructorDecl*>( 11039 cast<CXXConstructorDecl>(FNTarget)); 11040 S.Diag(C->getLocation(), diag::note_which_delegates_to); 11041 } 11042 } 11043 11044 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 11045 Invalid.insert(*CI); 11046 Current.clear(); 11047 } else { 11048 DelegatingCycleHelper(Target, Valid, Invalid, Current, S); 11049 } 11050} 11051 11052 11053void Sema::CheckDelegatingCtorCycles() { 11054 llvm::SmallSet<CXXConstructorDecl*, 4> Valid, Invalid, Current; 11055 11056 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 11057 CE = Current.end(); 11058 11059 for (DelegatingCtorDeclsType::iterator 11060 I = DelegatingCtorDecls.begin(ExternalSource), 11061 E = DelegatingCtorDecls.end(); 11062 I != E; ++I) 11063 DelegatingCycleHelper(*I, Valid, Invalid, Current, *this); 11064 11065 for (CI = Invalid.begin(), CE = Invalid.end(); CI != CE; ++CI) 11066 (*CI)->setInvalidDecl(); 11067} 11068 11069namespace { 11070 /// \brief AST visitor that finds references to the 'this' expression. 11071 class FindCXXThisExpr : public RecursiveASTVisitor<FindCXXThisExpr> { 11072 Sema &S; 11073 11074 public: 11075 explicit FindCXXThisExpr(Sema &S) : S(S) { } 11076 11077 bool VisitCXXThisExpr(CXXThisExpr *E) { 11078 S.Diag(E->getLocation(), diag::err_this_static_member_func) 11079 << E->isImplicit(); 11080 return false; 11081 } 11082 }; 11083} 11084 11085bool Sema::checkThisInStaticMemberFunctionType(CXXMethodDecl *Method) { 11086 TypeSourceInfo *TSInfo = Method->getTypeSourceInfo(); 11087 if (!TSInfo) 11088 return false; 11089 11090 TypeLoc TL = TSInfo->getTypeLoc(); 11091 FunctionProtoTypeLoc *ProtoTL = dyn_cast<FunctionProtoTypeLoc>(&TL); 11092 if (!ProtoTL) 11093 return false; 11094 11095 // C++11 [expr.prim.general]p3: 11096 // [The expression this] shall not appear before the optional 11097 // cv-qualifier-seq and it shall not appear within the declaration of a 11098 // static member function (although its type and value category are defined 11099 // within a static member function as they are within a non-static member 11100 // function). [ Note: this is because declaration matching does not occur 11101 // until the complete declarator is known. - end note ] 11102 const FunctionProtoType *Proto = ProtoTL->getTypePtr(); 11103 FindCXXThisExpr Finder(*this); 11104 11105 // If the return type came after the cv-qualifier-seq, check it now. 11106 if (Proto->hasTrailingReturn() && 11107 !Finder.TraverseTypeLoc(ProtoTL->getResultLoc())) 11108 return true; 11109 11110 // Check the exception specification. 11111 if (checkThisInStaticMemberFunctionExceptionSpec(Method)) 11112 return true; 11113 11114 return checkThisInStaticMemberFunctionAttributes(Method); 11115} 11116 11117bool Sema::checkThisInStaticMemberFunctionExceptionSpec(CXXMethodDecl *Method) { 11118 TypeSourceInfo *TSInfo = Method->getTypeSourceInfo(); 11119 if (!TSInfo) 11120 return false; 11121 11122 TypeLoc TL = TSInfo->getTypeLoc(); 11123 FunctionProtoTypeLoc *ProtoTL = dyn_cast<FunctionProtoTypeLoc>(&TL); 11124 if (!ProtoTL) 11125 return false; 11126 11127 const FunctionProtoType *Proto = ProtoTL->getTypePtr(); 11128 FindCXXThisExpr Finder(*this); 11129 11130 switch (Proto->getExceptionSpecType()) { 11131 case EST_Uninstantiated: 11132 case EST_Unevaluated: 11133 case EST_BasicNoexcept: 11134 case EST_DynamicNone: 11135 case EST_MSAny: 11136 case EST_None: 11137 break; 11138 11139 case EST_ComputedNoexcept: 11140 if (!Finder.TraverseStmt(Proto->getNoexceptExpr())) 11141 return true; 11142 11143 case EST_Dynamic: 11144 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(), 11145 EEnd = Proto->exception_end(); 11146 E != EEnd; ++E) { 11147 if (!Finder.TraverseType(*E)) 11148 return true; 11149 } 11150 break; 11151 } 11152 11153 return false; 11154} 11155 11156bool Sema::checkThisInStaticMemberFunctionAttributes(CXXMethodDecl *Method) { 11157 FindCXXThisExpr Finder(*this); 11158 11159 // Check attributes. 11160 for (Decl::attr_iterator A = Method->attr_begin(), AEnd = Method->attr_end(); 11161 A != AEnd; ++A) { 11162 // FIXME: This should be emitted by tblgen. 11163 Expr *Arg = 0; 11164 ArrayRef<Expr *> Args; 11165 if (GuardedByAttr *G = dyn_cast<GuardedByAttr>(*A)) 11166 Arg = G->getArg(); 11167 else if (PtGuardedByAttr *G = dyn_cast<PtGuardedByAttr>(*A)) 11168 Arg = G->getArg(); 11169 else if (AcquiredAfterAttr *AA = dyn_cast<AcquiredAfterAttr>(*A)) 11170 Args = ArrayRef<Expr *>(AA->args_begin(), AA->args_size()); 11171 else if (AcquiredBeforeAttr *AB = dyn_cast<AcquiredBeforeAttr>(*A)) 11172 Args = ArrayRef<Expr *>(AB->args_begin(), AB->args_size()); 11173 else if (ExclusiveLockFunctionAttr *ELF 11174 = dyn_cast<ExclusiveLockFunctionAttr>(*A)) 11175 Args = ArrayRef<Expr *>(ELF->args_begin(), ELF->args_size()); 11176 else if (SharedLockFunctionAttr *SLF 11177 = dyn_cast<SharedLockFunctionAttr>(*A)) 11178 Args = ArrayRef<Expr *>(SLF->args_begin(), SLF->args_size()); 11179 else if (ExclusiveTrylockFunctionAttr *ETLF 11180 = dyn_cast<ExclusiveTrylockFunctionAttr>(*A)) { 11181 Arg = ETLF->getSuccessValue(); 11182 Args = ArrayRef<Expr *>(ETLF->args_begin(), ETLF->args_size()); 11183 } else if (SharedTrylockFunctionAttr *STLF 11184 = dyn_cast<SharedTrylockFunctionAttr>(*A)) { 11185 Arg = STLF->getSuccessValue(); 11186 Args = ArrayRef<Expr *>(STLF->args_begin(), STLF->args_size()); 11187 } else if (UnlockFunctionAttr *UF = dyn_cast<UnlockFunctionAttr>(*A)) 11188 Args = ArrayRef<Expr *>(UF->args_begin(), UF->args_size()); 11189 else if (LockReturnedAttr *LR = dyn_cast<LockReturnedAttr>(*A)) 11190 Arg = LR->getArg(); 11191 else if (LocksExcludedAttr *LE = dyn_cast<LocksExcludedAttr>(*A)) 11192 Args = ArrayRef<Expr *>(LE->args_begin(), LE->args_size()); 11193 else if (ExclusiveLocksRequiredAttr *ELR 11194 = dyn_cast<ExclusiveLocksRequiredAttr>(*A)) 11195 Args = ArrayRef<Expr *>(ELR->args_begin(), ELR->args_size()); 11196 else if (SharedLocksRequiredAttr *SLR 11197 = dyn_cast<SharedLocksRequiredAttr>(*A)) 11198 Args = ArrayRef<Expr *>(SLR->args_begin(), SLR->args_size()); 11199 11200 if (Arg && !Finder.TraverseStmt(Arg)) 11201 return true; 11202 11203 for (unsigned I = 0, N = Args.size(); I != N; ++I) { 11204 if (!Finder.TraverseStmt(Args[I])) 11205 return true; 11206 } 11207 } 11208 11209 return false; 11210} 11211 11212void 11213Sema::checkExceptionSpecification(ExceptionSpecificationType EST, 11214 ArrayRef<ParsedType> DynamicExceptions, 11215 ArrayRef<SourceRange> DynamicExceptionRanges, 11216 Expr *NoexceptExpr, 11217 llvm::SmallVectorImpl<QualType> &Exceptions, 11218 FunctionProtoType::ExtProtoInfo &EPI) { 11219 Exceptions.clear(); 11220 EPI.ExceptionSpecType = EST; 11221 if (EST == EST_Dynamic) { 11222 Exceptions.reserve(DynamicExceptions.size()); 11223 for (unsigned ei = 0, ee = DynamicExceptions.size(); ei != ee; ++ei) { 11224 // FIXME: Preserve type source info. 11225 QualType ET = GetTypeFromParser(DynamicExceptions[ei]); 11226 11227 SmallVector<UnexpandedParameterPack, 2> Unexpanded; 11228 collectUnexpandedParameterPacks(ET, Unexpanded); 11229 if (!Unexpanded.empty()) { 11230 DiagnoseUnexpandedParameterPacks(DynamicExceptionRanges[ei].getBegin(), 11231 UPPC_ExceptionType, 11232 Unexpanded); 11233 continue; 11234 } 11235 11236 // Check that the type is valid for an exception spec, and 11237 // drop it if not. 11238 if (!CheckSpecifiedExceptionType(ET, DynamicExceptionRanges[ei])) 11239 Exceptions.push_back(ET); 11240 } 11241 EPI.NumExceptions = Exceptions.size(); 11242 EPI.Exceptions = Exceptions.data(); 11243 return; 11244 } 11245 11246 if (EST == EST_ComputedNoexcept) { 11247 // If an error occurred, there's no expression here. 11248 if (NoexceptExpr) { 11249 assert((NoexceptExpr->isTypeDependent() || 11250 NoexceptExpr->getType()->getCanonicalTypeUnqualified() == 11251 Context.BoolTy) && 11252 "Parser should have made sure that the expression is boolean"); 11253 if (NoexceptExpr && DiagnoseUnexpandedParameterPack(NoexceptExpr)) { 11254 EPI.ExceptionSpecType = EST_BasicNoexcept; 11255 return; 11256 } 11257 11258 if (!NoexceptExpr->isValueDependent()) 11259 NoexceptExpr = VerifyIntegerConstantExpression(NoexceptExpr, 0, 11260 diag::err_noexcept_needs_constant_expression, 11261 /*AllowFold*/ false).take(); 11262 EPI.NoexceptExpr = NoexceptExpr; 11263 } 11264 return; 11265 } 11266} 11267 11268/// IdentifyCUDATarget - Determine the CUDA compilation target for this function 11269Sema::CUDAFunctionTarget Sema::IdentifyCUDATarget(const FunctionDecl *D) { 11270 // Implicitly declared functions (e.g. copy constructors) are 11271 // __host__ __device__ 11272 if (D->isImplicit()) 11273 return CFT_HostDevice; 11274 11275 if (D->hasAttr<CUDAGlobalAttr>()) 11276 return CFT_Global; 11277 11278 if (D->hasAttr<CUDADeviceAttr>()) { 11279 if (D->hasAttr<CUDAHostAttr>()) 11280 return CFT_HostDevice; 11281 else 11282 return CFT_Device; 11283 } 11284 11285 return CFT_Host; 11286} 11287 11288bool Sema::CheckCUDATarget(CUDAFunctionTarget CallerTarget, 11289 CUDAFunctionTarget CalleeTarget) { 11290 // CUDA B.1.1 "The __device__ qualifier declares a function that is... 11291 // Callable from the device only." 11292 if (CallerTarget == CFT_Host && CalleeTarget == CFT_Device) 11293 return true; 11294 11295 // CUDA B.1.2 "The __global__ qualifier declares a function that is... 11296 // Callable from the host only." 11297 // CUDA B.1.3 "The __host__ qualifier declares a function that is... 11298 // Callable from the host only." 11299 if ((CallerTarget == CFT_Device || CallerTarget == CFT_Global) && 11300 (CalleeTarget == CFT_Host || CalleeTarget == CFT_Global)) 11301 return true; 11302 11303 if (CallerTarget == CFT_HostDevice && CalleeTarget != CFT_HostDevice) 11304 return true; 11305 11306 return false; 11307} 11308