SemaDeclCXX.cpp revision 17d35c36fbae764fcd68fa8b31624078a033aabc
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{ 685 switch (Tag) { 686 case TTK_Struct: return 0; 687 case TTK_Interface: return 1; 688 case TTK_Class: return 2; 689 default: assert("Invalid tag kind for record diagnostic!"); 690 } 691 return -1; 692} 693 694// CheckConstexprFunctionDecl - Check whether a function declaration satisfies 695// the requirements of a constexpr function definition or a constexpr 696// constructor definition. If so, return true. If not, produce appropriate 697// diagnostics and return false. 698// 699// This implements C++11 [dcl.constexpr]p3,4, as amended by DR1360. 700bool Sema::CheckConstexprFunctionDecl(const FunctionDecl *NewFD) { 701 const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewFD); 702 if (MD && MD->isInstance()) { 703 // C++11 [dcl.constexpr]p4: 704 // The definition of a constexpr constructor shall satisfy the following 705 // constraints: 706 // - the class shall not have any virtual base classes; 707 const CXXRecordDecl *RD = MD->getParent(); 708 if (RD->getNumVBases()) { 709 Diag(NewFD->getLocation(), diag::err_constexpr_virtual_base) 710 << isa<CXXConstructorDecl>(NewFD) 711 << getRecordDiagFromTagKind(RD->getTagKind()) << RD->getNumVBases(); 712 for (CXXRecordDecl::base_class_const_iterator I = RD->vbases_begin(), 713 E = RD->vbases_end(); I != E; ++I) 714 Diag(I->getLocStart(), 715 diag::note_constexpr_virtual_base_here) << I->getSourceRange(); 716 return false; 717 } 718 } 719 720 if (!isa<CXXConstructorDecl>(NewFD)) { 721 // C++11 [dcl.constexpr]p3: 722 // The definition of a constexpr function shall satisfy the following 723 // constraints: 724 // - it shall not be virtual; 725 const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD); 726 if (Method && Method->isVirtual()) { 727 Diag(NewFD->getLocation(), diag::err_constexpr_virtual); 728 729 // If it's not obvious why this function is virtual, find an overridden 730 // function which uses the 'virtual' keyword. 731 const CXXMethodDecl *WrittenVirtual = Method; 732 while (!WrittenVirtual->isVirtualAsWritten()) 733 WrittenVirtual = *WrittenVirtual->begin_overridden_methods(); 734 if (WrittenVirtual != Method) 735 Diag(WrittenVirtual->getLocation(), 736 diag::note_overridden_virtual_function); 737 return false; 738 } 739 740 // - its return type shall be a literal type; 741 QualType RT = NewFD->getResultType(); 742 if (!RT->isDependentType() && 743 RequireLiteralType(NewFD->getLocation(), RT, 744 diag::err_constexpr_non_literal_return)) 745 return false; 746 } 747 748 // - each of its parameter types shall be a literal type; 749 if (!CheckConstexprParameterTypes(*this, NewFD)) 750 return false; 751 752 return true; 753} 754 755/// Check the given declaration statement is legal within a constexpr function 756/// body. C++0x [dcl.constexpr]p3,p4. 757/// 758/// \return true if the body is OK, false if we have diagnosed a problem. 759static bool CheckConstexprDeclStmt(Sema &SemaRef, const FunctionDecl *Dcl, 760 DeclStmt *DS) { 761 // C++0x [dcl.constexpr]p3 and p4: 762 // The definition of a constexpr function(p3) or constructor(p4) [...] shall 763 // contain only 764 for (DeclStmt::decl_iterator DclIt = DS->decl_begin(), 765 DclEnd = DS->decl_end(); DclIt != DclEnd; ++DclIt) { 766 switch ((*DclIt)->getKind()) { 767 case Decl::StaticAssert: 768 case Decl::Using: 769 case Decl::UsingShadow: 770 case Decl::UsingDirective: 771 case Decl::UnresolvedUsingTypename: 772 // - static_assert-declarations 773 // - using-declarations, 774 // - using-directives, 775 continue; 776 777 case Decl::Typedef: 778 case Decl::TypeAlias: { 779 // - typedef declarations and alias-declarations that do not define 780 // classes or enumerations, 781 TypedefNameDecl *TN = cast<TypedefNameDecl>(*DclIt); 782 if (TN->getUnderlyingType()->isVariablyModifiedType()) { 783 // Don't allow variably-modified types in constexpr functions. 784 TypeLoc TL = TN->getTypeSourceInfo()->getTypeLoc(); 785 SemaRef.Diag(TL.getBeginLoc(), diag::err_constexpr_vla) 786 << TL.getSourceRange() << TL.getType() 787 << isa<CXXConstructorDecl>(Dcl); 788 return false; 789 } 790 continue; 791 } 792 793 case Decl::Enum: 794 case Decl::CXXRecord: 795 // As an extension, we allow the declaration (but not the definition) of 796 // classes and enumerations in all declarations, not just in typedef and 797 // alias declarations. 798 if (cast<TagDecl>(*DclIt)->isThisDeclarationADefinition()) { 799 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_type_definition) 800 << isa<CXXConstructorDecl>(Dcl); 801 return false; 802 } 803 continue; 804 805 case Decl::Var: 806 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_var_declaration) 807 << isa<CXXConstructorDecl>(Dcl); 808 return false; 809 810 default: 811 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_body_invalid_stmt) 812 << isa<CXXConstructorDecl>(Dcl); 813 return false; 814 } 815 } 816 817 return true; 818} 819 820/// Check that the given field is initialized within a constexpr constructor. 821/// 822/// \param Dcl The constexpr constructor being checked. 823/// \param Field The field being checked. This may be a member of an anonymous 824/// struct or union nested within the class being checked. 825/// \param Inits All declarations, including anonymous struct/union members and 826/// indirect members, for which any initialization was provided. 827/// \param Diagnosed Set to true if an error is produced. 828static void CheckConstexprCtorInitializer(Sema &SemaRef, 829 const FunctionDecl *Dcl, 830 FieldDecl *Field, 831 llvm::SmallSet<Decl*, 16> &Inits, 832 bool &Diagnosed) { 833 if (Field->isUnnamedBitfield()) 834 return; 835 836 if (Field->isAnonymousStructOrUnion() && 837 Field->getType()->getAsCXXRecordDecl()->isEmpty()) 838 return; 839 840 if (!Inits.count(Field)) { 841 if (!Diagnosed) { 842 SemaRef.Diag(Dcl->getLocation(), diag::err_constexpr_ctor_missing_init); 843 Diagnosed = true; 844 } 845 SemaRef.Diag(Field->getLocation(), diag::note_constexpr_ctor_missing_init); 846 } else if (Field->isAnonymousStructOrUnion()) { 847 const RecordDecl *RD = Field->getType()->castAs<RecordType>()->getDecl(); 848 for (RecordDecl::field_iterator I = RD->field_begin(), E = RD->field_end(); 849 I != E; ++I) 850 // If an anonymous union contains an anonymous struct of which any member 851 // is initialized, all members must be initialized. 852 if (!RD->isUnion() || Inits.count(*I)) 853 CheckConstexprCtorInitializer(SemaRef, Dcl, *I, Inits, Diagnosed); 854 } 855} 856 857/// Check the body for the given constexpr function declaration only contains 858/// the permitted types of statement. C++11 [dcl.constexpr]p3,p4. 859/// 860/// \return true if the body is OK, false if we have diagnosed a problem. 861bool Sema::CheckConstexprFunctionBody(const FunctionDecl *Dcl, Stmt *Body) { 862 if (isa<CXXTryStmt>(Body)) { 863 // C++11 [dcl.constexpr]p3: 864 // The definition of a constexpr function shall satisfy the following 865 // constraints: [...] 866 // - its function-body shall be = delete, = default, or a 867 // compound-statement 868 // 869 // C++11 [dcl.constexpr]p4: 870 // In the definition of a constexpr constructor, [...] 871 // - its function-body shall not be a function-try-block; 872 Diag(Body->getLocStart(), diag::err_constexpr_function_try_block) 873 << isa<CXXConstructorDecl>(Dcl); 874 return false; 875 } 876 877 // - its function-body shall be [...] a compound-statement that contains only 878 CompoundStmt *CompBody = cast<CompoundStmt>(Body); 879 880 llvm::SmallVector<SourceLocation, 4> ReturnStmts; 881 for (CompoundStmt::body_iterator BodyIt = CompBody->body_begin(), 882 BodyEnd = CompBody->body_end(); BodyIt != BodyEnd; ++BodyIt) { 883 switch ((*BodyIt)->getStmtClass()) { 884 case Stmt::NullStmtClass: 885 // - null statements, 886 continue; 887 888 case Stmt::DeclStmtClass: 889 // - static_assert-declarations 890 // - using-declarations, 891 // - using-directives, 892 // - typedef declarations and alias-declarations that do not define 893 // classes or enumerations, 894 if (!CheckConstexprDeclStmt(*this, Dcl, cast<DeclStmt>(*BodyIt))) 895 return false; 896 continue; 897 898 case Stmt::ReturnStmtClass: 899 // - and exactly one return statement; 900 if (isa<CXXConstructorDecl>(Dcl)) 901 break; 902 903 ReturnStmts.push_back((*BodyIt)->getLocStart()); 904 continue; 905 906 default: 907 break; 908 } 909 910 Diag((*BodyIt)->getLocStart(), diag::err_constexpr_body_invalid_stmt) 911 << isa<CXXConstructorDecl>(Dcl); 912 return false; 913 } 914 915 if (const CXXConstructorDecl *Constructor 916 = dyn_cast<CXXConstructorDecl>(Dcl)) { 917 const CXXRecordDecl *RD = Constructor->getParent(); 918 // DR1359: 919 // - every non-variant non-static data member and base class sub-object 920 // shall be initialized; 921 // - if the class is a non-empty union, or for each non-empty anonymous 922 // union member of a non-union class, exactly one non-static data member 923 // shall be initialized; 924 if (RD->isUnion()) { 925 if (Constructor->getNumCtorInitializers() == 0 && !RD->isEmpty()) { 926 Diag(Dcl->getLocation(), diag::err_constexpr_union_ctor_no_init); 927 return false; 928 } 929 } else if (!Constructor->isDependentContext() && 930 !Constructor->isDelegatingConstructor()) { 931 assert(RD->getNumVBases() == 0 && "constexpr ctor with virtual bases"); 932 933 // Skip detailed checking if we have enough initializers, and we would 934 // allow at most one initializer per member. 935 bool AnyAnonStructUnionMembers = false; 936 unsigned Fields = 0; 937 for (CXXRecordDecl::field_iterator I = RD->field_begin(), 938 E = RD->field_end(); I != E; ++I, ++Fields) { 939 if (I->isAnonymousStructOrUnion()) { 940 AnyAnonStructUnionMembers = true; 941 break; 942 } 943 } 944 if (AnyAnonStructUnionMembers || 945 Constructor->getNumCtorInitializers() != RD->getNumBases() + Fields) { 946 // Check initialization of non-static data members. Base classes are 947 // always initialized so do not need to be checked. Dependent bases 948 // might not have initializers in the member initializer list. 949 llvm::SmallSet<Decl*, 16> Inits; 950 for (CXXConstructorDecl::init_const_iterator 951 I = Constructor->init_begin(), E = Constructor->init_end(); 952 I != E; ++I) { 953 if (FieldDecl *FD = (*I)->getMember()) 954 Inits.insert(FD); 955 else if (IndirectFieldDecl *ID = (*I)->getIndirectMember()) 956 Inits.insert(ID->chain_begin(), ID->chain_end()); 957 } 958 959 bool Diagnosed = false; 960 for (CXXRecordDecl::field_iterator I = RD->field_begin(), 961 E = RD->field_end(); I != E; ++I) 962 CheckConstexprCtorInitializer(*this, Dcl, *I, Inits, Diagnosed); 963 if (Diagnosed) 964 return false; 965 } 966 } 967 } else { 968 if (ReturnStmts.empty()) { 969 Diag(Dcl->getLocation(), diag::err_constexpr_body_no_return); 970 return false; 971 } 972 if (ReturnStmts.size() > 1) { 973 Diag(ReturnStmts.back(), diag::err_constexpr_body_multiple_return); 974 for (unsigned I = 0; I < ReturnStmts.size() - 1; ++I) 975 Diag(ReturnStmts[I], diag::note_constexpr_body_previous_return); 976 return false; 977 } 978 } 979 980 // C++11 [dcl.constexpr]p5: 981 // if no function argument values exist such that the function invocation 982 // substitution would produce a constant expression, the program is 983 // ill-formed; no diagnostic required. 984 // C++11 [dcl.constexpr]p3: 985 // - every constructor call and implicit conversion used in initializing the 986 // return value shall be one of those allowed in a constant expression. 987 // C++11 [dcl.constexpr]p4: 988 // - every constructor involved in initializing non-static data members and 989 // base class sub-objects shall be a constexpr constructor. 990 llvm::SmallVector<PartialDiagnosticAt, 8> Diags; 991 if (!Expr::isPotentialConstantExpr(Dcl, Diags)) { 992 Diag(Dcl->getLocation(), diag::err_constexpr_function_never_constant_expr) 993 << isa<CXXConstructorDecl>(Dcl); 994 for (size_t I = 0, N = Diags.size(); I != N; ++I) 995 Diag(Diags[I].first, Diags[I].second); 996 return false; 997 } 998 999 return true; 1000} 1001 1002/// isCurrentClassName - Determine whether the identifier II is the 1003/// name of the class type currently being defined. In the case of 1004/// nested classes, this will only return true if II is the name of 1005/// the innermost class. 1006bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 1007 const CXXScopeSpec *SS) { 1008 assert(getLangOpts().CPlusPlus && "No class names in C!"); 1009 1010 CXXRecordDecl *CurDecl; 1011 if (SS && SS->isSet() && !SS->isInvalid()) { 1012 DeclContext *DC = computeDeclContext(*SS, true); 1013 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 1014 } else 1015 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 1016 1017 if (CurDecl && CurDecl->getIdentifier()) 1018 return &II == CurDecl->getIdentifier(); 1019 else 1020 return false; 1021} 1022 1023/// \brief Check the validity of a C++ base class specifier. 1024/// 1025/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 1026/// and returns NULL otherwise. 1027CXXBaseSpecifier * 1028Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 1029 SourceRange SpecifierRange, 1030 bool Virtual, AccessSpecifier Access, 1031 TypeSourceInfo *TInfo, 1032 SourceLocation EllipsisLoc) { 1033 QualType BaseType = TInfo->getType(); 1034 1035 // C++ [class.union]p1: 1036 // A union shall not have base classes. 1037 if (Class->isUnion()) { 1038 Diag(Class->getLocation(), diag::err_base_clause_on_union) 1039 << SpecifierRange; 1040 return 0; 1041 } 1042 1043 if (EllipsisLoc.isValid() && 1044 !TInfo->getType()->containsUnexpandedParameterPack()) { 1045 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 1046 << TInfo->getTypeLoc().getSourceRange(); 1047 EllipsisLoc = SourceLocation(); 1048 } 1049 1050 if (BaseType->isDependentType()) 1051 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 1052 Class->getTagKind() == TTK_Class, 1053 Access, TInfo, EllipsisLoc); 1054 1055 SourceLocation BaseLoc = TInfo->getTypeLoc().getBeginLoc(); 1056 1057 // Base specifiers must be record types. 1058 if (!BaseType->isRecordType()) { 1059 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 1060 return 0; 1061 } 1062 1063 // C++ [class.union]p1: 1064 // A union shall not be used as a base class. 1065 if (BaseType->isUnionType()) { 1066 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 1067 return 0; 1068 } 1069 1070 // C++ [class.derived]p2: 1071 // The class-name in a base-specifier shall not be an incompletely 1072 // defined class. 1073 if (RequireCompleteType(BaseLoc, BaseType, 1074 diag::err_incomplete_base_class, SpecifierRange)) { 1075 Class->setInvalidDecl(); 1076 return 0; 1077 } 1078 1079 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 1080 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 1081 assert(BaseDecl && "Record type has no declaration"); 1082 BaseDecl = BaseDecl->getDefinition(); 1083 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 1084 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 1085 assert(CXXBaseDecl && "Base type is not a C++ type"); 1086 1087 // C++ [class]p3: 1088 // If a class is marked final and it appears as a base-type-specifier in 1089 // base-clause, the program is ill-formed. 1090 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 1091 Diag(BaseLoc, diag::err_class_marked_final_used_as_base) 1092 << CXXBaseDecl->getDeclName(); 1093 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 1094 << CXXBaseDecl->getDeclName(); 1095 return 0; 1096 } 1097 1098 if (BaseDecl->isInvalidDecl()) 1099 Class->setInvalidDecl(); 1100 1101 // Create the base specifier. 1102 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 1103 Class->getTagKind() == TTK_Class, 1104 Access, TInfo, EllipsisLoc); 1105} 1106 1107/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 1108/// one entry in the base class list of a class specifier, for 1109/// example: 1110/// class foo : public bar, virtual private baz { 1111/// 'public bar' and 'virtual private baz' are each base-specifiers. 1112BaseResult 1113Sema::ActOnBaseSpecifier(Decl *classdecl, SourceRange SpecifierRange, 1114 bool Virtual, AccessSpecifier Access, 1115 ParsedType basetype, SourceLocation BaseLoc, 1116 SourceLocation EllipsisLoc) { 1117 if (!classdecl) 1118 return true; 1119 1120 AdjustDeclIfTemplate(classdecl); 1121 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl); 1122 if (!Class) 1123 return true; 1124 1125 TypeSourceInfo *TInfo = 0; 1126 GetTypeFromParser(basetype, &TInfo); 1127 1128 if (EllipsisLoc.isInvalid() && 1129 DiagnoseUnexpandedParameterPack(SpecifierRange.getBegin(), TInfo, 1130 UPPC_BaseType)) 1131 return true; 1132 1133 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 1134 Virtual, Access, TInfo, 1135 EllipsisLoc)) 1136 return BaseSpec; 1137 else 1138 Class->setInvalidDecl(); 1139 1140 return true; 1141} 1142 1143/// \brief Performs the actual work of attaching the given base class 1144/// specifiers to a C++ class. 1145bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 1146 unsigned NumBases) { 1147 if (NumBases == 0) 1148 return false; 1149 1150 // Used to keep track of which base types we have already seen, so 1151 // that we can properly diagnose redundant direct base types. Note 1152 // that the key is always the unqualified canonical type of the base 1153 // class. 1154 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 1155 1156 // Copy non-redundant base specifiers into permanent storage. 1157 unsigned NumGoodBases = 0; 1158 bool Invalid = false; 1159 for (unsigned idx = 0; idx < NumBases; ++idx) { 1160 QualType NewBaseType 1161 = Context.getCanonicalType(Bases[idx]->getType()); 1162 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 1163 1164 CXXBaseSpecifier *&KnownBase = KnownBaseTypes[NewBaseType]; 1165 if (KnownBase) { 1166 // C++ [class.mi]p3: 1167 // A class shall not be specified as a direct base class of a 1168 // derived class more than once. 1169 Diag(Bases[idx]->getLocStart(), 1170 diag::err_duplicate_base_class) 1171 << KnownBase->getType() 1172 << Bases[idx]->getSourceRange(); 1173 1174 // Delete the duplicate base class specifier; we're going to 1175 // overwrite its pointer later. 1176 Context.Deallocate(Bases[idx]); 1177 1178 Invalid = true; 1179 } else { 1180 // Okay, add this new base class. 1181 KnownBase = Bases[idx]; 1182 Bases[NumGoodBases++] = Bases[idx]; 1183 if (const RecordType *Record = NewBaseType->getAs<RecordType>()) 1184 if (const CXXRecordDecl *RD = cast<CXXRecordDecl>(Record->getDecl())) 1185 if (RD->hasAttr<WeakAttr>()) 1186 Class->addAttr(::new (Context) WeakAttr(SourceRange(), Context)); 1187 } 1188 } 1189 1190 // Attach the remaining base class specifiers to the derived class. 1191 Class->setBases(Bases, NumGoodBases); 1192 1193 // Delete the remaining (good) base class specifiers, since their 1194 // data has been copied into the CXXRecordDecl. 1195 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 1196 Context.Deallocate(Bases[idx]); 1197 1198 return Invalid; 1199} 1200 1201/// ActOnBaseSpecifiers - Attach the given base specifiers to the 1202/// class, after checking whether there are any duplicate base 1203/// classes. 1204void Sema::ActOnBaseSpecifiers(Decl *ClassDecl, CXXBaseSpecifier **Bases, 1205 unsigned NumBases) { 1206 if (!ClassDecl || !Bases || !NumBases) 1207 return; 1208 1209 AdjustDeclIfTemplate(ClassDecl); 1210 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl), 1211 (CXXBaseSpecifier**)(Bases), NumBases); 1212} 1213 1214static CXXRecordDecl *GetClassForType(QualType T) { 1215 if (const RecordType *RT = T->getAs<RecordType>()) 1216 return cast<CXXRecordDecl>(RT->getDecl()); 1217 else if (const InjectedClassNameType *ICT = T->getAs<InjectedClassNameType>()) 1218 return ICT->getDecl(); 1219 else 1220 return 0; 1221} 1222 1223/// \brief Determine whether the type \p Derived is a C++ class that is 1224/// derived from the type \p Base. 1225bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 1226 if (!getLangOpts().CPlusPlus) 1227 return false; 1228 1229 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 1230 if (!DerivedRD) 1231 return false; 1232 1233 CXXRecordDecl *BaseRD = GetClassForType(Base); 1234 if (!BaseRD) 1235 return false; 1236 1237 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 1238 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 1239} 1240 1241/// \brief Determine whether the type \p Derived is a C++ class that is 1242/// derived from the type \p Base. 1243bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 1244 if (!getLangOpts().CPlusPlus) 1245 return false; 1246 1247 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 1248 if (!DerivedRD) 1249 return false; 1250 1251 CXXRecordDecl *BaseRD = GetClassForType(Base); 1252 if (!BaseRD) 1253 return false; 1254 1255 return DerivedRD->isDerivedFrom(BaseRD, Paths); 1256} 1257 1258void Sema::BuildBasePathArray(const CXXBasePaths &Paths, 1259 CXXCastPath &BasePathArray) { 1260 assert(BasePathArray.empty() && "Base path array must be empty!"); 1261 assert(Paths.isRecordingPaths() && "Must record paths!"); 1262 1263 const CXXBasePath &Path = Paths.front(); 1264 1265 // We first go backward and check if we have a virtual base. 1266 // FIXME: It would be better if CXXBasePath had the base specifier for 1267 // the nearest virtual base. 1268 unsigned Start = 0; 1269 for (unsigned I = Path.size(); I != 0; --I) { 1270 if (Path[I - 1].Base->isVirtual()) { 1271 Start = I - 1; 1272 break; 1273 } 1274 } 1275 1276 // Now add all bases. 1277 for (unsigned I = Start, E = Path.size(); I != E; ++I) 1278 BasePathArray.push_back(const_cast<CXXBaseSpecifier*>(Path[I].Base)); 1279} 1280 1281/// \brief Determine whether the given base path includes a virtual 1282/// base class. 1283bool Sema::BasePathInvolvesVirtualBase(const CXXCastPath &BasePath) { 1284 for (CXXCastPath::const_iterator B = BasePath.begin(), 1285 BEnd = BasePath.end(); 1286 B != BEnd; ++B) 1287 if ((*B)->isVirtual()) 1288 return true; 1289 1290 return false; 1291} 1292 1293/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 1294/// conversion (where Derived and Base are class types) is 1295/// well-formed, meaning that the conversion is unambiguous (and 1296/// that all of the base classes are accessible). Returns true 1297/// and emits a diagnostic if the code is ill-formed, returns false 1298/// otherwise. Loc is the location where this routine should point to 1299/// if there is an error, and Range is the source range to highlight 1300/// if there is an error. 1301bool 1302Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 1303 unsigned InaccessibleBaseID, 1304 unsigned AmbigiousBaseConvID, 1305 SourceLocation Loc, SourceRange Range, 1306 DeclarationName Name, 1307 CXXCastPath *BasePath) { 1308 // First, determine whether the path from Derived to Base is 1309 // ambiguous. This is slightly more expensive than checking whether 1310 // the Derived to Base conversion exists, because here we need to 1311 // explore multiple paths to determine if there is an ambiguity. 1312 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1313 /*DetectVirtual=*/false); 1314 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 1315 assert(DerivationOkay && 1316 "Can only be used with a derived-to-base conversion"); 1317 (void)DerivationOkay; 1318 1319 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 1320 if (InaccessibleBaseID) { 1321 // Check that the base class can be accessed. 1322 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(), 1323 InaccessibleBaseID)) { 1324 case AR_inaccessible: 1325 return true; 1326 case AR_accessible: 1327 case AR_dependent: 1328 case AR_delayed: 1329 break; 1330 } 1331 } 1332 1333 // Build a base path if necessary. 1334 if (BasePath) 1335 BuildBasePathArray(Paths, *BasePath); 1336 return false; 1337 } 1338 1339 // We know that the derived-to-base conversion is ambiguous, and 1340 // we're going to produce a diagnostic. Perform the derived-to-base 1341 // search just one more time to compute all of the possible paths so 1342 // that we can print them out. This is more expensive than any of 1343 // the previous derived-to-base checks we've done, but at this point 1344 // performance isn't as much of an issue. 1345 Paths.clear(); 1346 Paths.setRecordingPaths(true); 1347 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 1348 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 1349 (void)StillOkay; 1350 1351 // Build up a textual representation of the ambiguous paths, e.g., 1352 // D -> B -> A, that will be used to illustrate the ambiguous 1353 // conversions in the diagnostic. We only print one of the paths 1354 // to each base class subobject. 1355 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 1356 1357 Diag(Loc, AmbigiousBaseConvID) 1358 << Derived << Base << PathDisplayStr << Range << Name; 1359 return true; 1360} 1361 1362bool 1363Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 1364 SourceLocation Loc, SourceRange Range, 1365 CXXCastPath *BasePath, 1366 bool IgnoreAccess) { 1367 return CheckDerivedToBaseConversion(Derived, Base, 1368 IgnoreAccess ? 0 1369 : diag::err_upcast_to_inaccessible_base, 1370 diag::err_ambiguous_derived_to_base_conv, 1371 Loc, Range, DeclarationName(), 1372 BasePath); 1373} 1374 1375 1376/// @brief Builds a string representing ambiguous paths from a 1377/// specific derived class to different subobjects of the same base 1378/// class. 1379/// 1380/// This function builds a string that can be used in error messages 1381/// to show the different paths that one can take through the 1382/// inheritance hierarchy to go from the derived class to different 1383/// subobjects of a base class. The result looks something like this: 1384/// @code 1385/// struct D -> struct B -> struct A 1386/// struct D -> struct C -> struct A 1387/// @endcode 1388std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 1389 std::string PathDisplayStr; 1390 std::set<unsigned> DisplayedPaths; 1391 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1392 Path != Paths.end(); ++Path) { 1393 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 1394 // We haven't displayed a path to this particular base 1395 // class subobject yet. 1396 PathDisplayStr += "\n "; 1397 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 1398 for (CXXBasePath::const_iterator Element = Path->begin(); 1399 Element != Path->end(); ++Element) 1400 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 1401 } 1402 } 1403 1404 return PathDisplayStr; 1405} 1406 1407//===----------------------------------------------------------------------===// 1408// C++ class member Handling 1409//===----------------------------------------------------------------------===// 1410 1411/// ActOnAccessSpecifier - Parsed an access specifier followed by a colon. 1412bool Sema::ActOnAccessSpecifier(AccessSpecifier Access, 1413 SourceLocation ASLoc, 1414 SourceLocation ColonLoc, 1415 AttributeList *Attrs) { 1416 assert(Access != AS_none && "Invalid kind for syntactic access specifier!"); 1417 AccessSpecDecl *ASDecl = AccessSpecDecl::Create(Context, Access, CurContext, 1418 ASLoc, ColonLoc); 1419 CurContext->addHiddenDecl(ASDecl); 1420 return ProcessAccessDeclAttributeList(ASDecl, Attrs); 1421} 1422 1423/// CheckOverrideControl - Check C++11 override control semantics. 1424void Sema::CheckOverrideControl(Decl *D) { 1425 const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D); 1426 1427 // Do we know which functions this declaration might be overriding? 1428 bool OverridesAreKnown = !MD || 1429 (!MD->getParent()->hasAnyDependentBases() && 1430 !MD->getType()->isDependentType()); 1431 1432 if (!MD || !MD->isVirtual()) { 1433 if (OverridesAreKnown) { 1434 if (OverrideAttr *OA = D->getAttr<OverrideAttr>()) { 1435 Diag(OA->getLocation(), 1436 diag::override_keyword_only_allowed_on_virtual_member_functions) 1437 << "override" << FixItHint::CreateRemoval(OA->getLocation()); 1438 D->dropAttr<OverrideAttr>(); 1439 } 1440 if (FinalAttr *FA = D->getAttr<FinalAttr>()) { 1441 Diag(FA->getLocation(), 1442 diag::override_keyword_only_allowed_on_virtual_member_functions) 1443 << "final" << FixItHint::CreateRemoval(FA->getLocation()); 1444 D->dropAttr<FinalAttr>(); 1445 } 1446 } 1447 return; 1448 } 1449 1450 if (!OverridesAreKnown) 1451 return; 1452 1453 // C++11 [class.virtual]p5: 1454 // If a virtual function is marked with the virt-specifier override and 1455 // does not override a member function of a base class, the program is 1456 // ill-formed. 1457 bool HasOverriddenMethods = 1458 MD->begin_overridden_methods() != MD->end_overridden_methods(); 1459 if (MD->hasAttr<OverrideAttr>() && !HasOverriddenMethods) 1460 Diag(MD->getLocation(), diag::err_function_marked_override_not_overriding) 1461 << MD->getDeclName(); 1462} 1463 1464/// CheckIfOverriddenFunctionIsMarkedFinal - Checks whether a virtual member 1465/// function overrides a virtual member function marked 'final', according to 1466/// C++11 [class.virtual]p4. 1467bool Sema::CheckIfOverriddenFunctionIsMarkedFinal(const CXXMethodDecl *New, 1468 const CXXMethodDecl *Old) { 1469 if (!Old->hasAttr<FinalAttr>()) 1470 return false; 1471 1472 Diag(New->getLocation(), diag::err_final_function_overridden) 1473 << New->getDeclName(); 1474 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 1475 return true; 1476} 1477 1478static bool InitializationHasSideEffects(const FieldDecl &FD) { 1479 const Type *T = FD.getType()->getBaseElementTypeUnsafe(); 1480 // FIXME: Destruction of ObjC lifetime types has side-effects. 1481 if (const CXXRecordDecl *RD = T->getAsCXXRecordDecl()) 1482 return !RD->isCompleteDefinition() || 1483 !RD->hasTrivialDefaultConstructor() || 1484 !RD->hasTrivialDestructor(); 1485 return false; 1486} 1487 1488/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 1489/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 1490/// bitfield width if there is one, 'InitExpr' specifies the initializer if 1491/// one has been parsed, and 'InitStyle' is set if an in-class initializer is 1492/// present (but parsing it has been deferred). 1493Decl * 1494Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 1495 MultiTemplateParamsArg TemplateParameterLists, 1496 Expr *BW, const VirtSpecifiers &VS, 1497 InClassInitStyle InitStyle) { 1498 const DeclSpec &DS = D.getDeclSpec(); 1499 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 1500 DeclarationName Name = NameInfo.getName(); 1501 SourceLocation Loc = NameInfo.getLoc(); 1502 1503 // For anonymous bitfields, the location should point to the type. 1504 if (Loc.isInvalid()) 1505 Loc = D.getLocStart(); 1506 1507 Expr *BitWidth = static_cast<Expr*>(BW); 1508 1509 assert(isa<CXXRecordDecl>(CurContext)); 1510 assert(!DS.isFriendSpecified()); 1511 1512 bool isFunc = D.isDeclarationOfFunction(); 1513 1514 // C++ 9.2p6: A member shall not be declared to have automatic storage 1515 // duration (auto, register) or with the extern storage-class-specifier. 1516 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 1517 // data members and cannot be applied to names declared const or static, 1518 // and cannot be applied to reference members. 1519 switch (DS.getStorageClassSpec()) { 1520 case DeclSpec::SCS_unspecified: 1521 case DeclSpec::SCS_typedef: 1522 case DeclSpec::SCS_static: 1523 // FALL THROUGH. 1524 break; 1525 case DeclSpec::SCS_mutable: 1526 if (isFunc) { 1527 if (DS.getStorageClassSpecLoc().isValid()) 1528 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 1529 else 1530 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 1531 1532 // FIXME: It would be nicer if the keyword was ignored only for this 1533 // declarator. Otherwise we could get follow-up errors. 1534 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1535 } 1536 break; 1537 default: 1538 if (DS.getStorageClassSpecLoc().isValid()) 1539 Diag(DS.getStorageClassSpecLoc(), 1540 diag::err_storageclass_invalid_for_member); 1541 else 1542 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 1543 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1544 } 1545 1546 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 1547 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 1548 !isFunc); 1549 1550 Decl *Member; 1551 if (isInstField) { 1552 CXXScopeSpec &SS = D.getCXXScopeSpec(); 1553 1554 // Data members must have identifiers for names. 1555 if (!Name.isIdentifier()) { 1556 Diag(Loc, diag::err_bad_variable_name) 1557 << Name; 1558 return 0; 1559 } 1560 1561 IdentifierInfo *II = Name.getAsIdentifierInfo(); 1562 1563 // Member field could not be with "template" keyword. 1564 // So TemplateParameterLists should be empty in this case. 1565 if (TemplateParameterLists.size()) { 1566 TemplateParameterList* TemplateParams = TemplateParameterLists[0]; 1567 if (TemplateParams->size()) { 1568 // There is no such thing as a member field template. 1569 Diag(D.getIdentifierLoc(), diag::err_template_member) 1570 << II 1571 << SourceRange(TemplateParams->getTemplateLoc(), 1572 TemplateParams->getRAngleLoc()); 1573 } else { 1574 // There is an extraneous 'template<>' for this member. 1575 Diag(TemplateParams->getTemplateLoc(), 1576 diag::err_template_member_noparams) 1577 << II 1578 << SourceRange(TemplateParams->getTemplateLoc(), 1579 TemplateParams->getRAngleLoc()); 1580 } 1581 return 0; 1582 } 1583 1584 if (SS.isSet() && !SS.isInvalid()) { 1585 // The user provided a superfluous scope specifier inside a class 1586 // definition: 1587 // 1588 // class X { 1589 // int X::member; 1590 // }; 1591 if (DeclContext *DC = computeDeclContext(SS, false)) 1592 diagnoseQualifiedDeclaration(SS, DC, Name, D.getIdentifierLoc()); 1593 else 1594 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 1595 << Name << SS.getRange(); 1596 1597 SS.clear(); 1598 } 1599 1600 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 1601 InitStyle, AS); 1602 assert(Member && "HandleField never returns null"); 1603 } else { 1604 assert(InitStyle == ICIS_NoInit); 1605 1606 Member = HandleDeclarator(S, D, TemplateParameterLists); 1607 if (!Member) { 1608 return 0; 1609 } 1610 1611 // Non-instance-fields can't have a bitfield. 1612 if (BitWidth) { 1613 if (Member->isInvalidDecl()) { 1614 // don't emit another diagnostic. 1615 } else if (isa<VarDecl>(Member)) { 1616 // C++ 9.6p3: A bit-field shall not be a static member. 1617 // "static member 'A' cannot be a bit-field" 1618 Diag(Loc, diag::err_static_not_bitfield) 1619 << Name << BitWidth->getSourceRange(); 1620 } else if (isa<TypedefDecl>(Member)) { 1621 // "typedef member 'x' cannot be a bit-field" 1622 Diag(Loc, diag::err_typedef_not_bitfield) 1623 << Name << BitWidth->getSourceRange(); 1624 } else { 1625 // A function typedef ("typedef int f(); f a;"). 1626 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 1627 Diag(Loc, diag::err_not_integral_type_bitfield) 1628 << Name << cast<ValueDecl>(Member)->getType() 1629 << BitWidth->getSourceRange(); 1630 } 1631 1632 BitWidth = 0; 1633 Member->setInvalidDecl(); 1634 } 1635 1636 Member->setAccess(AS); 1637 1638 // If we have declared a member function template, set the access of the 1639 // templated declaration as well. 1640 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 1641 FunTmpl->getTemplatedDecl()->setAccess(AS); 1642 } 1643 1644 if (VS.isOverrideSpecified()) 1645 Member->addAttr(new (Context) OverrideAttr(VS.getOverrideLoc(), Context)); 1646 if (VS.isFinalSpecified()) 1647 Member->addAttr(new (Context) FinalAttr(VS.getFinalLoc(), Context)); 1648 1649 if (VS.getLastLocation().isValid()) { 1650 // Update the end location of a method that has a virt-specifiers. 1651 if (CXXMethodDecl *MD = dyn_cast_or_null<CXXMethodDecl>(Member)) 1652 MD->setRangeEnd(VS.getLastLocation()); 1653 } 1654 1655 CheckOverrideControl(Member); 1656 1657 assert((Name || isInstField) && "No identifier for non-field ?"); 1658 1659 if (isInstField) { 1660 FieldDecl *FD = cast<FieldDecl>(Member); 1661 FieldCollector->Add(FD); 1662 1663 if (Diags.getDiagnosticLevel(diag::warn_unused_private_field, 1664 FD->getLocation()) 1665 != DiagnosticsEngine::Ignored) { 1666 // Remember all explicit private FieldDecls that have a name, no side 1667 // effects and are not part of a dependent type declaration. 1668 if (!FD->isImplicit() && FD->getDeclName() && 1669 FD->getAccess() == AS_private && 1670 !FD->hasAttr<UnusedAttr>() && 1671 !FD->getParent()->isDependentContext() && 1672 !InitializationHasSideEffects(*FD)) 1673 UnusedPrivateFields.insert(FD); 1674 } 1675 } 1676 1677 return Member; 1678} 1679 1680/// ActOnCXXInClassMemberInitializer - This is invoked after parsing an 1681/// in-class initializer for a non-static C++ class member, and after 1682/// instantiating an in-class initializer in a class template. Such actions 1683/// are deferred until the class is complete. 1684void 1685Sema::ActOnCXXInClassMemberInitializer(Decl *D, SourceLocation InitLoc, 1686 Expr *InitExpr) { 1687 FieldDecl *FD = cast<FieldDecl>(D); 1688 assert(FD->getInClassInitStyle() != ICIS_NoInit && 1689 "must set init style when field is created"); 1690 1691 if (!InitExpr) { 1692 FD->setInvalidDecl(); 1693 FD->removeInClassInitializer(); 1694 return; 1695 } 1696 1697 if (DiagnoseUnexpandedParameterPack(InitExpr, UPPC_Initializer)) { 1698 FD->setInvalidDecl(); 1699 FD->removeInClassInitializer(); 1700 return; 1701 } 1702 1703 ExprResult Init = InitExpr; 1704 if (!FD->getType()->isDependentType() && !InitExpr->isTypeDependent()) { 1705 if (isa<InitListExpr>(InitExpr) && isStdInitializerList(FD->getType(), 0)) { 1706 Diag(FD->getLocation(), diag::warn_dangling_std_initializer_list) 1707 << /*at end of ctor*/1 << InitExpr->getSourceRange(); 1708 } 1709 Expr **Inits = &InitExpr; 1710 unsigned NumInits = 1; 1711 InitializedEntity Entity = InitializedEntity::InitializeMember(FD); 1712 InitializationKind Kind = FD->getInClassInitStyle() == ICIS_ListInit 1713 ? InitializationKind::CreateDirectList(InitExpr->getLocStart()) 1714 : InitializationKind::CreateCopy(InitExpr->getLocStart(), InitLoc); 1715 InitializationSequence Seq(*this, Entity, Kind, Inits, NumInits); 1716 Init = Seq.Perform(*this, Entity, Kind, MultiExprArg(Inits, NumInits)); 1717 if (Init.isInvalid()) { 1718 FD->setInvalidDecl(); 1719 return; 1720 } 1721 1722 CheckImplicitConversions(Init.get(), InitLoc); 1723 } 1724 1725 // C++0x [class.base.init]p7: 1726 // The initialization of each base and member constitutes a 1727 // full-expression. 1728 Init = MaybeCreateExprWithCleanups(Init); 1729 if (Init.isInvalid()) { 1730 FD->setInvalidDecl(); 1731 return; 1732 } 1733 1734 InitExpr = Init.release(); 1735 1736 FD->setInClassInitializer(InitExpr); 1737} 1738 1739/// \brief Find the direct and/or virtual base specifiers that 1740/// correspond to the given base type, for use in base initialization 1741/// within a constructor. 1742static bool FindBaseInitializer(Sema &SemaRef, 1743 CXXRecordDecl *ClassDecl, 1744 QualType BaseType, 1745 const CXXBaseSpecifier *&DirectBaseSpec, 1746 const CXXBaseSpecifier *&VirtualBaseSpec) { 1747 // First, check for a direct base class. 1748 DirectBaseSpec = 0; 1749 for (CXXRecordDecl::base_class_const_iterator Base 1750 = ClassDecl->bases_begin(); 1751 Base != ClassDecl->bases_end(); ++Base) { 1752 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 1753 // We found a direct base of this type. That's what we're 1754 // initializing. 1755 DirectBaseSpec = &*Base; 1756 break; 1757 } 1758 } 1759 1760 // Check for a virtual base class. 1761 // FIXME: We might be able to short-circuit this if we know in advance that 1762 // there are no virtual bases. 1763 VirtualBaseSpec = 0; 1764 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 1765 // We haven't found a base yet; search the class hierarchy for a 1766 // virtual base class. 1767 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1768 /*DetectVirtual=*/false); 1769 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 1770 BaseType, Paths)) { 1771 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1772 Path != Paths.end(); ++Path) { 1773 if (Path->back().Base->isVirtual()) { 1774 VirtualBaseSpec = Path->back().Base; 1775 break; 1776 } 1777 } 1778 } 1779 } 1780 1781 return DirectBaseSpec || VirtualBaseSpec; 1782} 1783 1784/// \brief Handle a C++ member initializer using braced-init-list syntax. 1785MemInitResult 1786Sema::ActOnMemInitializer(Decl *ConstructorD, 1787 Scope *S, 1788 CXXScopeSpec &SS, 1789 IdentifierInfo *MemberOrBase, 1790 ParsedType TemplateTypeTy, 1791 const DeclSpec &DS, 1792 SourceLocation IdLoc, 1793 Expr *InitList, 1794 SourceLocation EllipsisLoc) { 1795 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy, 1796 DS, IdLoc, InitList, 1797 EllipsisLoc); 1798} 1799 1800/// \brief Handle a C++ member initializer using parentheses syntax. 1801MemInitResult 1802Sema::ActOnMemInitializer(Decl *ConstructorD, 1803 Scope *S, 1804 CXXScopeSpec &SS, 1805 IdentifierInfo *MemberOrBase, 1806 ParsedType TemplateTypeTy, 1807 const DeclSpec &DS, 1808 SourceLocation IdLoc, 1809 SourceLocation LParenLoc, 1810 Expr **Args, unsigned NumArgs, 1811 SourceLocation RParenLoc, 1812 SourceLocation EllipsisLoc) { 1813 Expr *List = new (Context) ParenListExpr(Context, LParenLoc, 1814 llvm::makeArrayRef(Args, NumArgs), 1815 RParenLoc); 1816 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy, 1817 DS, IdLoc, List, EllipsisLoc); 1818} 1819 1820namespace { 1821 1822// Callback to only accept typo corrections that can be a valid C++ member 1823// intializer: either a non-static field member or a base class. 1824class MemInitializerValidatorCCC : public CorrectionCandidateCallback { 1825 public: 1826 explicit MemInitializerValidatorCCC(CXXRecordDecl *ClassDecl) 1827 : ClassDecl(ClassDecl) {} 1828 1829 virtual bool ValidateCandidate(const TypoCorrection &candidate) { 1830 if (NamedDecl *ND = candidate.getCorrectionDecl()) { 1831 if (FieldDecl *Member = dyn_cast<FieldDecl>(ND)) 1832 return Member->getDeclContext()->getRedeclContext()->Equals(ClassDecl); 1833 else 1834 return isa<TypeDecl>(ND); 1835 } 1836 return false; 1837 } 1838 1839 private: 1840 CXXRecordDecl *ClassDecl; 1841}; 1842 1843} 1844 1845/// \brief Handle a C++ member initializer. 1846MemInitResult 1847Sema::BuildMemInitializer(Decl *ConstructorD, 1848 Scope *S, 1849 CXXScopeSpec &SS, 1850 IdentifierInfo *MemberOrBase, 1851 ParsedType TemplateTypeTy, 1852 const DeclSpec &DS, 1853 SourceLocation IdLoc, 1854 Expr *Init, 1855 SourceLocation EllipsisLoc) { 1856 if (!ConstructorD) 1857 return true; 1858 1859 AdjustDeclIfTemplate(ConstructorD); 1860 1861 CXXConstructorDecl *Constructor 1862 = dyn_cast<CXXConstructorDecl>(ConstructorD); 1863 if (!Constructor) { 1864 // The user wrote a constructor initializer on a function that is 1865 // not a C++ constructor. Ignore the error for now, because we may 1866 // have more member initializers coming; we'll diagnose it just 1867 // once in ActOnMemInitializers. 1868 return true; 1869 } 1870 1871 CXXRecordDecl *ClassDecl = Constructor->getParent(); 1872 1873 // C++ [class.base.init]p2: 1874 // Names in a mem-initializer-id are looked up in the scope of the 1875 // constructor's class and, if not found in that scope, are looked 1876 // up in the scope containing the constructor's definition. 1877 // [Note: if the constructor's class contains a member with the 1878 // same name as a direct or virtual base class of the class, a 1879 // mem-initializer-id naming the member or base class and composed 1880 // of a single identifier refers to the class member. A 1881 // mem-initializer-id for the hidden base class may be specified 1882 // using a qualified name. ] 1883 if (!SS.getScopeRep() && !TemplateTypeTy) { 1884 // Look for a member, first. 1885 DeclContext::lookup_result Result 1886 = ClassDecl->lookup(MemberOrBase); 1887 if (Result.first != Result.second) { 1888 ValueDecl *Member; 1889 if ((Member = dyn_cast<FieldDecl>(*Result.first)) || 1890 (Member = dyn_cast<IndirectFieldDecl>(*Result.first))) { 1891 if (EllipsisLoc.isValid()) 1892 Diag(EllipsisLoc, diag::err_pack_expansion_member_init) 1893 << MemberOrBase 1894 << SourceRange(IdLoc, Init->getSourceRange().getEnd()); 1895 1896 return BuildMemberInitializer(Member, Init, IdLoc); 1897 } 1898 } 1899 } 1900 // It didn't name a member, so see if it names a class. 1901 QualType BaseType; 1902 TypeSourceInfo *TInfo = 0; 1903 1904 if (TemplateTypeTy) { 1905 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 1906 } else if (DS.getTypeSpecType() == TST_decltype) { 1907 BaseType = BuildDecltypeType(DS.getRepAsExpr(), DS.getTypeSpecTypeLoc()); 1908 } else { 1909 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 1910 LookupParsedName(R, S, &SS); 1911 1912 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 1913 if (!TyD) { 1914 if (R.isAmbiguous()) return true; 1915 1916 // We don't want access-control diagnostics here. 1917 R.suppressDiagnostics(); 1918 1919 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 1920 bool NotUnknownSpecialization = false; 1921 DeclContext *DC = computeDeclContext(SS, false); 1922 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 1923 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 1924 1925 if (!NotUnknownSpecialization) { 1926 // When the scope specifier can refer to a member of an unknown 1927 // specialization, we take it as a type name. 1928 BaseType = CheckTypenameType(ETK_None, SourceLocation(), 1929 SS.getWithLocInContext(Context), 1930 *MemberOrBase, IdLoc); 1931 if (BaseType.isNull()) 1932 return true; 1933 1934 R.clear(); 1935 R.setLookupName(MemberOrBase); 1936 } 1937 } 1938 1939 // If no results were found, try to correct typos. 1940 TypoCorrection Corr; 1941 MemInitializerValidatorCCC Validator(ClassDecl); 1942 if (R.empty() && BaseType.isNull() && 1943 (Corr = CorrectTypo(R.getLookupNameInfo(), R.getLookupKind(), S, &SS, 1944 Validator, ClassDecl))) { 1945 std::string CorrectedStr(Corr.getAsString(getLangOpts())); 1946 std::string CorrectedQuotedStr(Corr.getQuoted(getLangOpts())); 1947 if (FieldDecl *Member = Corr.getCorrectionDeclAs<FieldDecl>()) { 1948 // We have found a non-static data member with a similar 1949 // name to what was typed; complain and initialize that 1950 // member. 1951 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1952 << MemberOrBase << true << CorrectedQuotedStr 1953 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr); 1954 Diag(Member->getLocation(), diag::note_previous_decl) 1955 << CorrectedQuotedStr; 1956 1957 return BuildMemberInitializer(Member, Init, IdLoc); 1958 } else if (TypeDecl *Type = Corr.getCorrectionDeclAs<TypeDecl>()) { 1959 const CXXBaseSpecifier *DirectBaseSpec; 1960 const CXXBaseSpecifier *VirtualBaseSpec; 1961 if (FindBaseInitializer(*this, ClassDecl, 1962 Context.getTypeDeclType(Type), 1963 DirectBaseSpec, VirtualBaseSpec)) { 1964 // We have found a direct or virtual base class with a 1965 // similar name to what was typed; complain and initialize 1966 // that base class. 1967 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1968 << MemberOrBase << false << CorrectedQuotedStr 1969 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr); 1970 1971 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 1972 : VirtualBaseSpec; 1973 Diag(BaseSpec->getLocStart(), 1974 diag::note_base_class_specified_here) 1975 << BaseSpec->getType() 1976 << BaseSpec->getSourceRange(); 1977 1978 TyD = Type; 1979 } 1980 } 1981 } 1982 1983 if (!TyD && BaseType.isNull()) { 1984 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1985 << MemberOrBase << SourceRange(IdLoc,Init->getSourceRange().getEnd()); 1986 return true; 1987 } 1988 } 1989 1990 if (BaseType.isNull()) { 1991 BaseType = Context.getTypeDeclType(TyD); 1992 if (SS.isSet()) { 1993 NestedNameSpecifier *Qualifier = 1994 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1995 1996 // FIXME: preserve source range information 1997 BaseType = Context.getElaboratedType(ETK_None, Qualifier, BaseType); 1998 } 1999 } 2000 } 2001 2002 if (!TInfo) 2003 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 2004 2005 return BuildBaseInitializer(BaseType, TInfo, Init, ClassDecl, EllipsisLoc); 2006} 2007 2008/// Checks a member initializer expression for cases where reference (or 2009/// pointer) members are bound to by-value parameters (or their addresses). 2010static void CheckForDanglingReferenceOrPointer(Sema &S, ValueDecl *Member, 2011 Expr *Init, 2012 SourceLocation IdLoc) { 2013 QualType MemberTy = Member->getType(); 2014 2015 // We only handle pointers and references currently. 2016 // FIXME: Would this be relevant for ObjC object pointers? Or block pointers? 2017 if (!MemberTy->isReferenceType() && !MemberTy->isPointerType()) 2018 return; 2019 2020 const bool IsPointer = MemberTy->isPointerType(); 2021 if (IsPointer) { 2022 if (const UnaryOperator *Op 2023 = dyn_cast<UnaryOperator>(Init->IgnoreParenImpCasts())) { 2024 // The only case we're worried about with pointers requires taking the 2025 // address. 2026 if (Op->getOpcode() != UO_AddrOf) 2027 return; 2028 2029 Init = Op->getSubExpr(); 2030 } else { 2031 // We only handle address-of expression initializers for pointers. 2032 return; 2033 } 2034 } 2035 2036 if (isa<MaterializeTemporaryExpr>(Init->IgnoreParens())) { 2037 // Taking the address of a temporary will be diagnosed as a hard error. 2038 if (IsPointer) 2039 return; 2040 2041 S.Diag(Init->getExprLoc(), diag::warn_bind_ref_member_to_temporary) 2042 << Member << Init->getSourceRange(); 2043 } else if (const DeclRefExpr *DRE 2044 = dyn_cast<DeclRefExpr>(Init->IgnoreParens())) { 2045 // We only warn when referring to a non-reference parameter declaration. 2046 const ParmVarDecl *Parameter = dyn_cast<ParmVarDecl>(DRE->getDecl()); 2047 if (!Parameter || Parameter->getType()->isReferenceType()) 2048 return; 2049 2050 S.Diag(Init->getExprLoc(), 2051 IsPointer ? diag::warn_init_ptr_member_to_parameter_addr 2052 : diag::warn_bind_ref_member_to_parameter) 2053 << Member << Parameter << Init->getSourceRange(); 2054 } else { 2055 // Other initializers are fine. 2056 return; 2057 } 2058 2059 S.Diag(Member->getLocation(), diag::note_ref_or_ptr_member_declared_here) 2060 << (unsigned)IsPointer; 2061} 2062 2063namespace { 2064 class UninitializedFieldVisitor 2065 : public EvaluatedExprVisitor<UninitializedFieldVisitor> { 2066 Sema &S; 2067 ValueDecl *VD; 2068 public: 2069 typedef EvaluatedExprVisitor<UninitializedFieldVisitor> Inherited; 2070 UninitializedFieldVisitor(Sema &S, ValueDecl *VD) : Inherited(S.Context), 2071 S(S), VD(VD) { 2072 } 2073 2074 void HandleExpr(Expr *E) { 2075 if (!E) return; 2076 2077 // Expressions like x(x) sometimes lack the surrounding expressions 2078 // but need to be checked anyways. 2079 HandleValue(E); 2080 Visit(E); 2081 } 2082 2083 void HandleValue(Expr *E) { 2084 E = E->IgnoreParens(); 2085 2086 if (MemberExpr *ME = dyn_cast<MemberExpr>(E)) { 2087 if (isa<EnumConstantDecl>(ME->getMemberDecl())) 2088 return; 2089 Expr *Base = E; 2090 while (isa<MemberExpr>(Base)) { 2091 ME = dyn_cast<MemberExpr>(Base); 2092 if (VarDecl *VarD = dyn_cast<VarDecl>(ME->getMemberDecl())) 2093 if (VarD->hasGlobalStorage()) 2094 return; 2095 Base = ME->getBase(); 2096 } 2097 2098 if (VD == ME->getMemberDecl() && isa<CXXThisExpr>(Base)) { 2099 unsigned diag = VD->getType()->isReferenceType() 2100 ? diag::warn_reference_field_is_uninit 2101 : diag::warn_field_is_uninit; 2102 S.Diag(ME->getExprLoc(), diag); 2103 return; 2104 } 2105 } 2106 2107 if (ConditionalOperator *CO = dyn_cast<ConditionalOperator>(E)) { 2108 HandleValue(CO->getTrueExpr()); 2109 HandleValue(CO->getFalseExpr()); 2110 return; 2111 } 2112 2113 if (BinaryConditionalOperator *BCO = 2114 dyn_cast<BinaryConditionalOperator>(E)) { 2115 HandleValue(BCO->getCommon()); 2116 HandleValue(BCO->getFalseExpr()); 2117 return; 2118 } 2119 2120 if (BinaryOperator *BO = dyn_cast<BinaryOperator>(E)) { 2121 switch (BO->getOpcode()) { 2122 default: 2123 return; 2124 case(BO_PtrMemD): 2125 case(BO_PtrMemI): 2126 HandleValue(BO->getLHS()); 2127 return; 2128 case(BO_Comma): 2129 HandleValue(BO->getRHS()); 2130 return; 2131 } 2132 } 2133 } 2134 2135 void VisitImplicitCastExpr(ImplicitCastExpr *E) { 2136 if (E->getCastKind() == CK_LValueToRValue) 2137 HandleValue(E->getSubExpr()); 2138 2139 Inherited::VisitImplicitCastExpr(E); 2140 } 2141 2142 void VisitCXXMemberCallExpr(CXXMemberCallExpr *E) { 2143 Expr *Callee = E->getCallee(); 2144 if (isa<MemberExpr>(Callee)) 2145 HandleValue(Callee); 2146 2147 Inherited::VisitCXXMemberCallExpr(E); 2148 } 2149 }; 2150 static void CheckInitExprContainsUninitializedFields(Sema &S, Expr *E, 2151 ValueDecl *VD) { 2152 UninitializedFieldVisitor(S, VD).HandleExpr(E); 2153 } 2154} // namespace 2155 2156MemInitResult 2157Sema::BuildMemberInitializer(ValueDecl *Member, Expr *Init, 2158 SourceLocation IdLoc) { 2159 FieldDecl *DirectMember = dyn_cast<FieldDecl>(Member); 2160 IndirectFieldDecl *IndirectMember = dyn_cast<IndirectFieldDecl>(Member); 2161 assert((DirectMember || IndirectMember) && 2162 "Member must be a FieldDecl or IndirectFieldDecl"); 2163 2164 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) 2165 return true; 2166 2167 if (Member->isInvalidDecl()) 2168 return true; 2169 2170 // Diagnose value-uses of fields to initialize themselves, e.g. 2171 // foo(foo) 2172 // where foo is not also a parameter to the constructor. 2173 // TODO: implement -Wuninitialized and fold this into that framework. 2174 Expr **Args; 2175 unsigned NumArgs; 2176 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { 2177 Args = ParenList->getExprs(); 2178 NumArgs = ParenList->getNumExprs(); 2179 } else { 2180 InitListExpr *InitList = cast<InitListExpr>(Init); 2181 Args = InitList->getInits(); 2182 NumArgs = InitList->getNumInits(); 2183 } 2184 2185 if (getDiagnostics().getDiagnosticLevel(diag::warn_field_is_uninit, IdLoc) 2186 != DiagnosticsEngine::Ignored) 2187 for (unsigned i = 0; i < NumArgs; ++i) 2188 // FIXME: Warn about the case when other fields are used before being 2189 // uninitialized. For example, let this field be the i'th field. When 2190 // initializing the i'th field, throw a warning if any of the >= i'th 2191 // fields are used, as they are not yet initialized. 2192 // Right now we are only handling the case where the i'th field uses 2193 // itself in its initializer. 2194 CheckInitExprContainsUninitializedFields(*this, Args[i], Member); 2195 2196 SourceRange InitRange = Init->getSourceRange(); 2197 2198 if (Member->getType()->isDependentType() || Init->isTypeDependent()) { 2199 // Can't check initialization for a member of dependent type or when 2200 // any of the arguments are type-dependent expressions. 2201 DiscardCleanupsInEvaluationContext(); 2202 } else { 2203 bool InitList = false; 2204 if (isa<InitListExpr>(Init)) { 2205 InitList = true; 2206 Args = &Init; 2207 NumArgs = 1; 2208 2209 if (isStdInitializerList(Member->getType(), 0)) { 2210 Diag(IdLoc, diag::warn_dangling_std_initializer_list) 2211 << /*at end of ctor*/1 << InitRange; 2212 } 2213 } 2214 2215 // Initialize the member. 2216 InitializedEntity MemberEntity = 2217 DirectMember ? InitializedEntity::InitializeMember(DirectMember, 0) 2218 : InitializedEntity::InitializeMember(IndirectMember, 0); 2219 InitializationKind Kind = 2220 InitList ? InitializationKind::CreateDirectList(IdLoc) 2221 : InitializationKind::CreateDirect(IdLoc, InitRange.getBegin(), 2222 InitRange.getEnd()); 2223 2224 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args, NumArgs); 2225 ExprResult MemberInit = InitSeq.Perform(*this, MemberEntity, Kind, 2226 MultiExprArg(Args, NumArgs), 2227 0); 2228 if (MemberInit.isInvalid()) 2229 return true; 2230 2231 CheckImplicitConversions(MemberInit.get(), 2232 InitRange.getBegin()); 2233 2234 // C++0x [class.base.init]p7: 2235 // The initialization of each base and member constitutes a 2236 // full-expression. 2237 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 2238 if (MemberInit.isInvalid()) 2239 return true; 2240 2241 // If we are in a dependent context, template instantiation will 2242 // perform this type-checking again. Just save the arguments that we 2243 // received. 2244 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2245 // of the information that we have about the member 2246 // initializer. However, deconstructing the ASTs is a dicey process, 2247 // and this approach is far more likely to get the corner cases right. 2248 if (CurContext->isDependentContext()) { 2249 // The existing Init will do fine. 2250 } else { 2251 Init = MemberInit.get(); 2252 CheckForDanglingReferenceOrPointer(*this, Member, Init, IdLoc); 2253 } 2254 } 2255 2256 if (DirectMember) { 2257 return new (Context) CXXCtorInitializer(Context, DirectMember, IdLoc, 2258 InitRange.getBegin(), Init, 2259 InitRange.getEnd()); 2260 } else { 2261 return new (Context) CXXCtorInitializer(Context, IndirectMember, IdLoc, 2262 InitRange.getBegin(), Init, 2263 InitRange.getEnd()); 2264 } 2265} 2266 2267MemInitResult 2268Sema::BuildDelegatingInitializer(TypeSourceInfo *TInfo, Expr *Init, 2269 CXXRecordDecl *ClassDecl) { 2270 SourceLocation NameLoc = TInfo->getTypeLoc().getLocalSourceRange().getBegin(); 2271 if (!LangOpts.CPlusPlus0x) 2272 return Diag(NameLoc, diag::err_delegating_ctor) 2273 << TInfo->getTypeLoc().getLocalSourceRange(); 2274 Diag(NameLoc, diag::warn_cxx98_compat_delegating_ctor); 2275 2276 bool InitList = true; 2277 Expr **Args = &Init; 2278 unsigned NumArgs = 1; 2279 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { 2280 InitList = false; 2281 Args = ParenList->getExprs(); 2282 NumArgs = ParenList->getNumExprs(); 2283 } 2284 2285 SourceRange InitRange = Init->getSourceRange(); 2286 // Initialize the object. 2287 InitializedEntity DelegationEntity = InitializedEntity::InitializeDelegation( 2288 QualType(ClassDecl->getTypeForDecl(), 0)); 2289 InitializationKind Kind = 2290 InitList ? InitializationKind::CreateDirectList(NameLoc) 2291 : InitializationKind::CreateDirect(NameLoc, InitRange.getBegin(), 2292 InitRange.getEnd()); 2293 InitializationSequence InitSeq(*this, DelegationEntity, Kind, Args, NumArgs); 2294 ExprResult DelegationInit = InitSeq.Perform(*this, DelegationEntity, Kind, 2295 MultiExprArg(Args, NumArgs), 2296 0); 2297 if (DelegationInit.isInvalid()) 2298 return true; 2299 2300 assert(cast<CXXConstructExpr>(DelegationInit.get())->getConstructor() && 2301 "Delegating constructor with no target?"); 2302 2303 CheckImplicitConversions(DelegationInit.get(), InitRange.getBegin()); 2304 2305 // C++0x [class.base.init]p7: 2306 // The initialization of each base and member constitutes a 2307 // full-expression. 2308 DelegationInit = MaybeCreateExprWithCleanups(DelegationInit); 2309 if (DelegationInit.isInvalid()) 2310 return true; 2311 2312 // If we are in a dependent context, template instantiation will 2313 // perform this type-checking again. Just save the arguments that we 2314 // received in a ParenListExpr. 2315 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2316 // of the information that we have about the base 2317 // initializer. However, deconstructing the ASTs is a dicey process, 2318 // and this approach is far more likely to get the corner cases right. 2319 if (CurContext->isDependentContext()) 2320 DelegationInit = Owned(Init); 2321 2322 return new (Context) CXXCtorInitializer(Context, TInfo, InitRange.getBegin(), 2323 DelegationInit.takeAs<Expr>(), 2324 InitRange.getEnd()); 2325} 2326 2327MemInitResult 2328Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 2329 Expr *Init, CXXRecordDecl *ClassDecl, 2330 SourceLocation EllipsisLoc) { 2331 SourceLocation BaseLoc 2332 = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); 2333 2334 if (!BaseType->isDependentType() && !BaseType->isRecordType()) 2335 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 2336 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2337 2338 // C++ [class.base.init]p2: 2339 // [...] Unless the mem-initializer-id names a nonstatic data 2340 // member of the constructor's class or a direct or virtual base 2341 // of that class, the mem-initializer is ill-formed. A 2342 // mem-initializer-list can initialize a base class using any 2343 // name that denotes that base class type. 2344 bool Dependent = BaseType->isDependentType() || Init->isTypeDependent(); 2345 2346 SourceRange InitRange = Init->getSourceRange(); 2347 if (EllipsisLoc.isValid()) { 2348 // This is a pack expansion. 2349 if (!BaseType->containsUnexpandedParameterPack()) { 2350 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 2351 << SourceRange(BaseLoc, InitRange.getEnd()); 2352 2353 EllipsisLoc = SourceLocation(); 2354 } 2355 } else { 2356 // Check for any unexpanded parameter packs. 2357 if (DiagnoseUnexpandedParameterPack(BaseLoc, BaseTInfo, UPPC_Initializer)) 2358 return true; 2359 2360 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) 2361 return true; 2362 } 2363 2364 // Check for direct and virtual base classes. 2365 const CXXBaseSpecifier *DirectBaseSpec = 0; 2366 const CXXBaseSpecifier *VirtualBaseSpec = 0; 2367 if (!Dependent) { 2368 if (Context.hasSameUnqualifiedType(QualType(ClassDecl->getTypeForDecl(),0), 2369 BaseType)) 2370 return BuildDelegatingInitializer(BaseTInfo, Init, ClassDecl); 2371 2372 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 2373 VirtualBaseSpec); 2374 2375 // C++ [base.class.init]p2: 2376 // Unless the mem-initializer-id names a nonstatic data member of the 2377 // constructor's class or a direct or virtual base of that class, the 2378 // mem-initializer is ill-formed. 2379 if (!DirectBaseSpec && !VirtualBaseSpec) { 2380 // If the class has any dependent bases, then it's possible that 2381 // one of those types will resolve to the same type as 2382 // BaseType. Therefore, just treat this as a dependent base 2383 // class initialization. FIXME: Should we try to check the 2384 // initialization anyway? It seems odd. 2385 if (ClassDecl->hasAnyDependentBases()) 2386 Dependent = true; 2387 else 2388 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 2389 << BaseType << Context.getTypeDeclType(ClassDecl) 2390 << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2391 } 2392 } 2393 2394 if (Dependent) { 2395 DiscardCleanupsInEvaluationContext(); 2396 2397 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 2398 /*IsVirtual=*/false, 2399 InitRange.getBegin(), Init, 2400 InitRange.getEnd(), EllipsisLoc); 2401 } 2402 2403 // C++ [base.class.init]p2: 2404 // If a mem-initializer-id is ambiguous because it designates both 2405 // a direct non-virtual base class and an inherited virtual base 2406 // class, the mem-initializer is ill-formed. 2407 if (DirectBaseSpec && VirtualBaseSpec) 2408 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 2409 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2410 2411 CXXBaseSpecifier *BaseSpec = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 2412 if (!BaseSpec) 2413 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 2414 2415 // Initialize the base. 2416 bool InitList = true; 2417 Expr **Args = &Init; 2418 unsigned NumArgs = 1; 2419 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { 2420 InitList = false; 2421 Args = ParenList->getExprs(); 2422 NumArgs = ParenList->getNumExprs(); 2423 } 2424 2425 InitializedEntity BaseEntity = 2426 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 2427 InitializationKind Kind = 2428 InitList ? InitializationKind::CreateDirectList(BaseLoc) 2429 : InitializationKind::CreateDirect(BaseLoc, InitRange.getBegin(), 2430 InitRange.getEnd()); 2431 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args, NumArgs); 2432 ExprResult BaseInit = InitSeq.Perform(*this, BaseEntity, Kind, 2433 MultiExprArg(Args, NumArgs), 0); 2434 if (BaseInit.isInvalid()) 2435 return true; 2436 2437 CheckImplicitConversions(BaseInit.get(), InitRange.getBegin()); 2438 2439 // C++0x [class.base.init]p7: 2440 // The initialization of each base and member constitutes a 2441 // full-expression. 2442 BaseInit = MaybeCreateExprWithCleanups(BaseInit); 2443 if (BaseInit.isInvalid()) 2444 return true; 2445 2446 // If we are in a dependent context, template instantiation will 2447 // perform this type-checking again. Just save the arguments that we 2448 // received in a ParenListExpr. 2449 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2450 // of the information that we have about the base 2451 // initializer. However, deconstructing the ASTs is a dicey process, 2452 // and this approach is far more likely to get the corner cases right. 2453 if (CurContext->isDependentContext()) 2454 BaseInit = Owned(Init); 2455 2456 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 2457 BaseSpec->isVirtual(), 2458 InitRange.getBegin(), 2459 BaseInit.takeAs<Expr>(), 2460 InitRange.getEnd(), EllipsisLoc); 2461} 2462 2463// Create a static_cast\<T&&>(expr). 2464static Expr *CastForMoving(Sema &SemaRef, Expr *E) { 2465 QualType ExprType = E->getType(); 2466 QualType TargetType = SemaRef.Context.getRValueReferenceType(ExprType); 2467 SourceLocation ExprLoc = E->getLocStart(); 2468 TypeSourceInfo *TargetLoc = SemaRef.Context.getTrivialTypeSourceInfo( 2469 TargetType, ExprLoc); 2470 2471 return SemaRef.BuildCXXNamedCast(ExprLoc, tok::kw_static_cast, TargetLoc, E, 2472 SourceRange(ExprLoc, ExprLoc), 2473 E->getSourceRange()).take(); 2474} 2475 2476/// ImplicitInitializerKind - How an implicit base or member initializer should 2477/// initialize its base or member. 2478enum ImplicitInitializerKind { 2479 IIK_Default, 2480 IIK_Copy, 2481 IIK_Move 2482}; 2483 2484static bool 2485BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 2486 ImplicitInitializerKind ImplicitInitKind, 2487 CXXBaseSpecifier *BaseSpec, 2488 bool IsInheritedVirtualBase, 2489 CXXCtorInitializer *&CXXBaseInit) { 2490 InitializedEntity InitEntity 2491 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 2492 IsInheritedVirtualBase); 2493 2494 ExprResult BaseInit; 2495 2496 switch (ImplicitInitKind) { 2497 case IIK_Default: { 2498 InitializationKind InitKind 2499 = InitializationKind::CreateDefault(Constructor->getLocation()); 2500 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 2501 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, MultiExprArg()); 2502 break; 2503 } 2504 2505 case IIK_Move: 2506 case IIK_Copy: { 2507 bool Moving = ImplicitInitKind == IIK_Move; 2508 ParmVarDecl *Param = Constructor->getParamDecl(0); 2509 QualType ParamType = Param->getType().getNonReferenceType(); 2510 2511 Expr *CopyCtorArg = 2512 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), 2513 SourceLocation(), Param, false, 2514 Constructor->getLocation(), ParamType, 2515 VK_LValue, 0); 2516 2517 SemaRef.MarkDeclRefReferenced(cast<DeclRefExpr>(CopyCtorArg)); 2518 2519 // Cast to the base class to avoid ambiguities. 2520 QualType ArgTy = 2521 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), 2522 ParamType.getQualifiers()); 2523 2524 if (Moving) { 2525 CopyCtorArg = CastForMoving(SemaRef, CopyCtorArg); 2526 } 2527 2528 CXXCastPath BasePath; 2529 BasePath.push_back(BaseSpec); 2530 CopyCtorArg = SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, 2531 CK_UncheckedDerivedToBase, 2532 Moving ? VK_XValue : VK_LValue, 2533 &BasePath).take(); 2534 2535 InitializationKind InitKind 2536 = InitializationKind::CreateDirect(Constructor->getLocation(), 2537 SourceLocation(), SourceLocation()); 2538 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 2539 &CopyCtorArg, 1); 2540 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 2541 MultiExprArg(&CopyCtorArg, 1)); 2542 break; 2543 } 2544 } 2545 2546 BaseInit = SemaRef.MaybeCreateExprWithCleanups(BaseInit); 2547 if (BaseInit.isInvalid()) 2548 return true; 2549 2550 CXXBaseInit = 2551 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2552 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 2553 SourceLocation()), 2554 BaseSpec->isVirtual(), 2555 SourceLocation(), 2556 BaseInit.takeAs<Expr>(), 2557 SourceLocation(), 2558 SourceLocation()); 2559 2560 return false; 2561} 2562 2563static bool RefersToRValueRef(Expr *MemRef) { 2564 ValueDecl *Referenced = cast<MemberExpr>(MemRef)->getMemberDecl(); 2565 return Referenced->getType()->isRValueReferenceType(); 2566} 2567 2568static bool 2569BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 2570 ImplicitInitializerKind ImplicitInitKind, 2571 FieldDecl *Field, IndirectFieldDecl *Indirect, 2572 CXXCtorInitializer *&CXXMemberInit) { 2573 if (Field->isInvalidDecl()) 2574 return true; 2575 2576 SourceLocation Loc = Constructor->getLocation(); 2577 2578 if (ImplicitInitKind == IIK_Copy || ImplicitInitKind == IIK_Move) { 2579 bool Moving = ImplicitInitKind == IIK_Move; 2580 ParmVarDecl *Param = Constructor->getParamDecl(0); 2581 QualType ParamType = Param->getType().getNonReferenceType(); 2582 2583 // Suppress copying zero-width bitfields. 2584 if (Field->isBitField() && Field->getBitWidthValue(SemaRef.Context) == 0) 2585 return false; 2586 2587 Expr *MemberExprBase = 2588 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), 2589 SourceLocation(), Param, false, 2590 Loc, ParamType, VK_LValue, 0); 2591 2592 SemaRef.MarkDeclRefReferenced(cast<DeclRefExpr>(MemberExprBase)); 2593 2594 if (Moving) { 2595 MemberExprBase = CastForMoving(SemaRef, MemberExprBase); 2596 } 2597 2598 // Build a reference to this field within the parameter. 2599 CXXScopeSpec SS; 2600 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, 2601 Sema::LookupMemberName); 2602 MemberLookup.addDecl(Indirect ? cast<ValueDecl>(Indirect) 2603 : cast<ValueDecl>(Field), AS_public); 2604 MemberLookup.resolveKind(); 2605 ExprResult CtorArg 2606 = SemaRef.BuildMemberReferenceExpr(MemberExprBase, 2607 ParamType, Loc, 2608 /*IsArrow=*/false, 2609 SS, 2610 /*TemplateKWLoc=*/SourceLocation(), 2611 /*FirstQualifierInScope=*/0, 2612 MemberLookup, 2613 /*TemplateArgs=*/0); 2614 if (CtorArg.isInvalid()) 2615 return true; 2616 2617 // C++11 [class.copy]p15: 2618 // - if a member m has rvalue reference type T&&, it is direct-initialized 2619 // with static_cast<T&&>(x.m); 2620 if (RefersToRValueRef(CtorArg.get())) { 2621 CtorArg = CastForMoving(SemaRef, CtorArg.take()); 2622 } 2623 2624 // When the field we are copying is an array, create index variables for 2625 // each dimension of the array. We use these index variables to subscript 2626 // the source array, and other clients (e.g., CodeGen) will perform the 2627 // necessary iteration with these index variables. 2628 SmallVector<VarDecl *, 4> IndexVariables; 2629 QualType BaseType = Field->getType(); 2630 QualType SizeType = SemaRef.Context.getSizeType(); 2631 bool InitializingArray = false; 2632 while (const ConstantArrayType *Array 2633 = SemaRef.Context.getAsConstantArrayType(BaseType)) { 2634 InitializingArray = true; 2635 // Create the iteration variable for this array index. 2636 IdentifierInfo *IterationVarName = 0; 2637 { 2638 SmallString<8> Str; 2639 llvm::raw_svector_ostream OS(Str); 2640 OS << "__i" << IndexVariables.size(); 2641 IterationVarName = &SemaRef.Context.Idents.get(OS.str()); 2642 } 2643 VarDecl *IterationVar 2644 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, Loc, 2645 IterationVarName, SizeType, 2646 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc), 2647 SC_None, SC_None); 2648 IndexVariables.push_back(IterationVar); 2649 2650 // Create a reference to the iteration variable. 2651 ExprResult IterationVarRef 2652 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, VK_LValue, Loc); 2653 assert(!IterationVarRef.isInvalid() && 2654 "Reference to invented variable cannot fail!"); 2655 IterationVarRef = SemaRef.DefaultLvalueConversion(IterationVarRef.take()); 2656 assert(!IterationVarRef.isInvalid() && 2657 "Conversion of invented variable cannot fail!"); 2658 2659 // Subscript the array with this iteration variable. 2660 CtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(CtorArg.take(), Loc, 2661 IterationVarRef.take(), 2662 Loc); 2663 if (CtorArg.isInvalid()) 2664 return true; 2665 2666 BaseType = Array->getElementType(); 2667 } 2668 2669 // The array subscript expression is an lvalue, which is wrong for moving. 2670 if (Moving && InitializingArray) 2671 CtorArg = CastForMoving(SemaRef, CtorArg.take()); 2672 2673 // Construct the entity that we will be initializing. For an array, this 2674 // will be first element in the array, which may require several levels 2675 // of array-subscript entities. 2676 SmallVector<InitializedEntity, 4> Entities; 2677 Entities.reserve(1 + IndexVariables.size()); 2678 if (Indirect) 2679 Entities.push_back(InitializedEntity::InitializeMember(Indirect)); 2680 else 2681 Entities.push_back(InitializedEntity::InitializeMember(Field)); 2682 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I) 2683 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context, 2684 0, 2685 Entities.back())); 2686 2687 // Direct-initialize to use the copy constructor. 2688 InitializationKind InitKind = 2689 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); 2690 2691 Expr *CtorArgE = CtorArg.takeAs<Expr>(); 2692 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, 2693 &CtorArgE, 1); 2694 2695 ExprResult MemberInit 2696 = InitSeq.Perform(SemaRef, Entities.back(), InitKind, 2697 MultiExprArg(&CtorArgE, 1)); 2698 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2699 if (MemberInit.isInvalid()) 2700 return true; 2701 2702 if (Indirect) { 2703 assert(IndexVariables.size() == 0 && 2704 "Indirect field improperly initialized"); 2705 CXXMemberInit 2706 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 2707 Loc, Loc, 2708 MemberInit.takeAs<Expr>(), 2709 Loc); 2710 } else 2711 CXXMemberInit = CXXCtorInitializer::Create(SemaRef.Context, Field, Loc, 2712 Loc, MemberInit.takeAs<Expr>(), 2713 Loc, 2714 IndexVariables.data(), 2715 IndexVariables.size()); 2716 return false; 2717 } 2718 2719 assert(ImplicitInitKind == IIK_Default && "Unhandled implicit init kind!"); 2720 2721 QualType FieldBaseElementType = 2722 SemaRef.Context.getBaseElementType(Field->getType()); 2723 2724 if (FieldBaseElementType->isRecordType()) { 2725 InitializedEntity InitEntity 2726 = Indirect? InitializedEntity::InitializeMember(Indirect) 2727 : InitializedEntity::InitializeMember(Field); 2728 InitializationKind InitKind = 2729 InitializationKind::CreateDefault(Loc); 2730 2731 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 2732 ExprResult MemberInit = 2733 InitSeq.Perform(SemaRef, InitEntity, InitKind, MultiExprArg()); 2734 2735 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2736 if (MemberInit.isInvalid()) 2737 return true; 2738 2739 if (Indirect) 2740 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2741 Indirect, Loc, 2742 Loc, 2743 MemberInit.get(), 2744 Loc); 2745 else 2746 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2747 Field, Loc, Loc, 2748 MemberInit.get(), 2749 Loc); 2750 return false; 2751 } 2752 2753 if (!Field->getParent()->isUnion()) { 2754 if (FieldBaseElementType->isReferenceType()) { 2755 SemaRef.Diag(Constructor->getLocation(), 2756 diag::err_uninitialized_member_in_ctor) 2757 << (int)Constructor->isImplicit() 2758 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2759 << 0 << Field->getDeclName(); 2760 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2761 return true; 2762 } 2763 2764 if (FieldBaseElementType.isConstQualified()) { 2765 SemaRef.Diag(Constructor->getLocation(), 2766 diag::err_uninitialized_member_in_ctor) 2767 << (int)Constructor->isImplicit() 2768 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2769 << 1 << Field->getDeclName(); 2770 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2771 return true; 2772 } 2773 } 2774 2775 if (SemaRef.getLangOpts().ObjCAutoRefCount && 2776 FieldBaseElementType->isObjCRetainableType() && 2777 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_None && 2778 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_ExplicitNone) { 2779 // ARC: 2780 // Default-initialize Objective-C pointers to NULL. 2781 CXXMemberInit 2782 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 2783 Loc, Loc, 2784 new (SemaRef.Context) ImplicitValueInitExpr(Field->getType()), 2785 Loc); 2786 return false; 2787 } 2788 2789 // Nothing to initialize. 2790 CXXMemberInit = 0; 2791 return false; 2792} 2793 2794namespace { 2795struct BaseAndFieldInfo { 2796 Sema &S; 2797 CXXConstructorDecl *Ctor; 2798 bool AnyErrorsInInits; 2799 ImplicitInitializerKind IIK; 2800 llvm::DenseMap<const void *, CXXCtorInitializer*> AllBaseFields; 2801 SmallVector<CXXCtorInitializer*, 8> AllToInit; 2802 2803 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) 2804 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { 2805 bool Generated = Ctor->isImplicit() || Ctor->isDefaulted(); 2806 if (Generated && Ctor->isCopyConstructor()) 2807 IIK = IIK_Copy; 2808 else if (Generated && Ctor->isMoveConstructor()) 2809 IIK = IIK_Move; 2810 else 2811 IIK = IIK_Default; 2812 } 2813 2814 bool isImplicitCopyOrMove() const { 2815 switch (IIK) { 2816 case IIK_Copy: 2817 case IIK_Move: 2818 return true; 2819 2820 case IIK_Default: 2821 return false; 2822 } 2823 2824 llvm_unreachable("Invalid ImplicitInitializerKind!"); 2825 } 2826 2827 bool addFieldInitializer(CXXCtorInitializer *Init) { 2828 AllToInit.push_back(Init); 2829 2830 // Check whether this initializer makes the field "used". 2831 if (Init->getInit() && Init->getInit()->HasSideEffects(S.Context)) 2832 S.UnusedPrivateFields.remove(Init->getAnyMember()); 2833 2834 return false; 2835 } 2836}; 2837} 2838 2839/// \brief Determine whether the given indirect field declaration is somewhere 2840/// within an anonymous union. 2841static bool isWithinAnonymousUnion(IndirectFieldDecl *F) { 2842 for (IndirectFieldDecl::chain_iterator C = F->chain_begin(), 2843 CEnd = F->chain_end(); 2844 C != CEnd; ++C) 2845 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>((*C)->getDeclContext())) 2846 if (Record->isUnion()) 2847 return true; 2848 2849 return false; 2850} 2851 2852/// \brief Determine whether the given type is an incomplete or zero-lenfgth 2853/// array type. 2854static bool isIncompleteOrZeroLengthArrayType(ASTContext &Context, QualType T) { 2855 if (T->isIncompleteArrayType()) 2856 return true; 2857 2858 while (const ConstantArrayType *ArrayT = Context.getAsConstantArrayType(T)) { 2859 if (!ArrayT->getSize()) 2860 return true; 2861 2862 T = ArrayT->getElementType(); 2863 } 2864 2865 return false; 2866} 2867 2868static bool CollectFieldInitializer(Sema &SemaRef, BaseAndFieldInfo &Info, 2869 FieldDecl *Field, 2870 IndirectFieldDecl *Indirect = 0) { 2871 2872 // Overwhelmingly common case: we have a direct initializer for this field. 2873 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(Field)) 2874 return Info.addFieldInitializer(Init); 2875 2876 // C++11 [class.base.init]p8: if the entity is a non-static data member that 2877 // has a brace-or-equal-initializer, the entity is initialized as specified 2878 // in [dcl.init]. 2879 if (Field->hasInClassInitializer() && !Info.isImplicitCopyOrMove()) { 2880 CXXCtorInitializer *Init; 2881 if (Indirect) 2882 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 2883 SourceLocation(), 2884 SourceLocation(), 0, 2885 SourceLocation()); 2886 else 2887 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 2888 SourceLocation(), 2889 SourceLocation(), 0, 2890 SourceLocation()); 2891 return Info.addFieldInitializer(Init); 2892 } 2893 2894 // Don't build an implicit initializer for union members if none was 2895 // explicitly specified. 2896 if (Field->getParent()->isUnion() || 2897 (Indirect && isWithinAnonymousUnion(Indirect))) 2898 return false; 2899 2900 // Don't initialize incomplete or zero-length arrays. 2901 if (isIncompleteOrZeroLengthArrayType(SemaRef.Context, Field->getType())) 2902 return false; 2903 2904 // Don't try to build an implicit initializer if there were semantic 2905 // errors in any of the initializers (and therefore we might be 2906 // missing some that the user actually wrote). 2907 if (Info.AnyErrorsInInits || Field->isInvalidDecl()) 2908 return false; 2909 2910 CXXCtorInitializer *Init = 0; 2911 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, 2912 Indirect, Init)) 2913 return true; 2914 2915 if (!Init) 2916 return false; 2917 2918 return Info.addFieldInitializer(Init); 2919} 2920 2921bool 2922Sema::SetDelegatingInitializer(CXXConstructorDecl *Constructor, 2923 CXXCtorInitializer *Initializer) { 2924 assert(Initializer->isDelegatingInitializer()); 2925 Constructor->setNumCtorInitializers(1); 2926 CXXCtorInitializer **initializer = 2927 new (Context) CXXCtorInitializer*[1]; 2928 memcpy(initializer, &Initializer, sizeof (CXXCtorInitializer*)); 2929 Constructor->setCtorInitializers(initializer); 2930 2931 if (CXXDestructorDecl *Dtor = LookupDestructor(Constructor->getParent())) { 2932 MarkFunctionReferenced(Initializer->getSourceLocation(), Dtor); 2933 DiagnoseUseOfDecl(Dtor, Initializer->getSourceLocation()); 2934 } 2935 2936 DelegatingCtorDecls.push_back(Constructor); 2937 2938 return false; 2939} 2940 2941bool Sema::SetCtorInitializers(CXXConstructorDecl *Constructor, 2942 CXXCtorInitializer **Initializers, 2943 unsigned NumInitializers, 2944 bool AnyErrors) { 2945 if (Constructor->isDependentContext()) { 2946 // Just store the initializers as written, they will be checked during 2947 // instantiation. 2948 if (NumInitializers > 0) { 2949 Constructor->setNumCtorInitializers(NumInitializers); 2950 CXXCtorInitializer **baseOrMemberInitializers = 2951 new (Context) CXXCtorInitializer*[NumInitializers]; 2952 memcpy(baseOrMemberInitializers, Initializers, 2953 NumInitializers * sizeof(CXXCtorInitializer*)); 2954 Constructor->setCtorInitializers(baseOrMemberInitializers); 2955 } 2956 2957 return false; 2958 } 2959 2960 BaseAndFieldInfo Info(*this, Constructor, AnyErrors); 2961 2962 // We need to build the initializer AST according to order of construction 2963 // and not what user specified in the Initializers list. 2964 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 2965 if (!ClassDecl) 2966 return true; 2967 2968 bool HadError = false; 2969 2970 for (unsigned i = 0; i < NumInitializers; i++) { 2971 CXXCtorInitializer *Member = Initializers[i]; 2972 2973 if (Member->isBaseInitializer()) 2974 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 2975 else 2976 Info.AllBaseFields[Member->getAnyMember()] = Member; 2977 } 2978 2979 // Keep track of the direct virtual bases. 2980 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 2981 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 2982 E = ClassDecl->bases_end(); I != E; ++I) { 2983 if (I->isVirtual()) 2984 DirectVBases.insert(I); 2985 } 2986 2987 // Push virtual bases before others. 2988 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2989 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2990 2991 if (CXXCtorInitializer *Value 2992 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 2993 Info.AllToInit.push_back(Value); 2994 } else if (!AnyErrors) { 2995 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 2996 CXXCtorInitializer *CXXBaseInit; 2997 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2998 VBase, IsInheritedVirtualBase, 2999 CXXBaseInit)) { 3000 HadError = true; 3001 continue; 3002 } 3003 3004 Info.AllToInit.push_back(CXXBaseInit); 3005 } 3006 } 3007 3008 // Non-virtual bases. 3009 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3010 E = ClassDecl->bases_end(); Base != E; ++Base) { 3011 // Virtuals are in the virtual base list and already constructed. 3012 if (Base->isVirtual()) 3013 continue; 3014 3015 if (CXXCtorInitializer *Value 3016 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 3017 Info.AllToInit.push_back(Value); 3018 } else if (!AnyErrors) { 3019 CXXCtorInitializer *CXXBaseInit; 3020 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 3021 Base, /*IsInheritedVirtualBase=*/false, 3022 CXXBaseInit)) { 3023 HadError = true; 3024 continue; 3025 } 3026 3027 Info.AllToInit.push_back(CXXBaseInit); 3028 } 3029 } 3030 3031 // Fields. 3032 for (DeclContext::decl_iterator Mem = ClassDecl->decls_begin(), 3033 MemEnd = ClassDecl->decls_end(); 3034 Mem != MemEnd; ++Mem) { 3035 if (FieldDecl *F = dyn_cast<FieldDecl>(*Mem)) { 3036 // C++ [class.bit]p2: 3037 // A declaration for a bit-field that omits the identifier declares an 3038 // unnamed bit-field. Unnamed bit-fields are not members and cannot be 3039 // initialized. 3040 if (F->isUnnamedBitfield()) 3041 continue; 3042 3043 // If we're not generating the implicit copy/move constructor, then we'll 3044 // handle anonymous struct/union fields based on their individual 3045 // indirect fields. 3046 if (F->isAnonymousStructOrUnion() && Info.IIK == IIK_Default) 3047 continue; 3048 3049 if (CollectFieldInitializer(*this, Info, F)) 3050 HadError = true; 3051 continue; 3052 } 3053 3054 // Beyond this point, we only consider default initialization. 3055 if (Info.IIK != IIK_Default) 3056 continue; 3057 3058 if (IndirectFieldDecl *F = dyn_cast<IndirectFieldDecl>(*Mem)) { 3059 if (F->getType()->isIncompleteArrayType()) { 3060 assert(ClassDecl->hasFlexibleArrayMember() && 3061 "Incomplete array type is not valid"); 3062 continue; 3063 } 3064 3065 // Initialize each field of an anonymous struct individually. 3066 if (CollectFieldInitializer(*this, Info, F->getAnonField(), F)) 3067 HadError = true; 3068 3069 continue; 3070 } 3071 } 3072 3073 NumInitializers = Info.AllToInit.size(); 3074 if (NumInitializers > 0) { 3075 Constructor->setNumCtorInitializers(NumInitializers); 3076 CXXCtorInitializer **baseOrMemberInitializers = 3077 new (Context) CXXCtorInitializer*[NumInitializers]; 3078 memcpy(baseOrMemberInitializers, Info.AllToInit.data(), 3079 NumInitializers * sizeof(CXXCtorInitializer*)); 3080 Constructor->setCtorInitializers(baseOrMemberInitializers); 3081 3082 // Constructors implicitly reference the base and member 3083 // destructors. 3084 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 3085 Constructor->getParent()); 3086 } 3087 3088 return HadError; 3089} 3090 3091static void *GetKeyForTopLevelField(FieldDecl *Field) { 3092 // For anonymous unions, use the class declaration as the key. 3093 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 3094 if (RT->getDecl()->isAnonymousStructOrUnion()) 3095 return static_cast<void *>(RT->getDecl()); 3096 } 3097 return static_cast<void *>(Field); 3098} 3099 3100static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 3101 return const_cast<Type*>(Context.getCanonicalType(BaseType).getTypePtr()); 3102} 3103 3104static void *GetKeyForMember(ASTContext &Context, 3105 CXXCtorInitializer *Member) { 3106 if (!Member->isAnyMemberInitializer()) 3107 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 3108 3109 // For fields injected into the class via declaration of an anonymous union, 3110 // use its anonymous union class declaration as the unique key. 3111 FieldDecl *Field = Member->getAnyMember(); 3112 3113 // If the field is a member of an anonymous struct or union, our key 3114 // is the anonymous record decl that's a direct child of the class. 3115 RecordDecl *RD = Field->getParent(); 3116 if (RD->isAnonymousStructOrUnion()) { 3117 while (true) { 3118 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 3119 if (Parent->isAnonymousStructOrUnion()) 3120 RD = Parent; 3121 else 3122 break; 3123 } 3124 3125 return static_cast<void *>(RD); 3126 } 3127 3128 return static_cast<void *>(Field); 3129} 3130 3131static void 3132DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 3133 const CXXConstructorDecl *Constructor, 3134 CXXCtorInitializer **Inits, 3135 unsigned NumInits) { 3136 if (Constructor->getDeclContext()->isDependentContext()) 3137 return; 3138 3139 // Don't check initializers order unless the warning is enabled at the 3140 // location of at least one initializer. 3141 bool ShouldCheckOrder = false; 3142 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 3143 CXXCtorInitializer *Init = Inits[InitIndex]; 3144 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order, 3145 Init->getSourceLocation()) 3146 != DiagnosticsEngine::Ignored) { 3147 ShouldCheckOrder = true; 3148 break; 3149 } 3150 } 3151 if (!ShouldCheckOrder) 3152 return; 3153 3154 // Build the list of bases and members in the order that they'll 3155 // actually be initialized. The explicit initializers should be in 3156 // this same order but may be missing things. 3157 SmallVector<const void*, 32> IdealInitKeys; 3158 3159 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 3160 3161 // 1. Virtual bases. 3162 for (CXXRecordDecl::base_class_const_iterator VBase = 3163 ClassDecl->vbases_begin(), 3164 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 3165 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 3166 3167 // 2. Non-virtual bases. 3168 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 3169 E = ClassDecl->bases_end(); Base != E; ++Base) { 3170 if (Base->isVirtual()) 3171 continue; 3172 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 3173 } 3174 3175 // 3. Direct fields. 3176 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 3177 E = ClassDecl->field_end(); Field != E; ++Field) { 3178 if (Field->isUnnamedBitfield()) 3179 continue; 3180 3181 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 3182 } 3183 3184 unsigned NumIdealInits = IdealInitKeys.size(); 3185 unsigned IdealIndex = 0; 3186 3187 CXXCtorInitializer *PrevInit = 0; 3188 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 3189 CXXCtorInitializer *Init = Inits[InitIndex]; 3190 void *InitKey = GetKeyForMember(SemaRef.Context, Init); 3191 3192 // Scan forward to try to find this initializer in the idealized 3193 // initializers list. 3194 for (; IdealIndex != NumIdealInits; ++IdealIndex) 3195 if (InitKey == IdealInitKeys[IdealIndex]) 3196 break; 3197 3198 // If we didn't find this initializer, it must be because we 3199 // scanned past it on a previous iteration. That can only 3200 // happen if we're out of order; emit a warning. 3201 if (IdealIndex == NumIdealInits && PrevInit) { 3202 Sema::SemaDiagnosticBuilder D = 3203 SemaRef.Diag(PrevInit->getSourceLocation(), 3204 diag::warn_initializer_out_of_order); 3205 3206 if (PrevInit->isAnyMemberInitializer()) 3207 D << 0 << PrevInit->getAnyMember()->getDeclName(); 3208 else 3209 D << 1 << PrevInit->getTypeSourceInfo()->getType(); 3210 3211 if (Init->isAnyMemberInitializer()) 3212 D << 0 << Init->getAnyMember()->getDeclName(); 3213 else 3214 D << 1 << Init->getTypeSourceInfo()->getType(); 3215 3216 // Move back to the initializer's location in the ideal list. 3217 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 3218 if (InitKey == IdealInitKeys[IdealIndex]) 3219 break; 3220 3221 assert(IdealIndex != NumIdealInits && 3222 "initializer not found in initializer list"); 3223 } 3224 3225 PrevInit = Init; 3226 } 3227} 3228 3229namespace { 3230bool CheckRedundantInit(Sema &S, 3231 CXXCtorInitializer *Init, 3232 CXXCtorInitializer *&PrevInit) { 3233 if (!PrevInit) { 3234 PrevInit = Init; 3235 return false; 3236 } 3237 3238 if (FieldDecl *Field = Init->getMember()) 3239 S.Diag(Init->getSourceLocation(), 3240 diag::err_multiple_mem_initialization) 3241 << Field->getDeclName() 3242 << Init->getSourceRange(); 3243 else { 3244 const Type *BaseClass = Init->getBaseClass(); 3245 assert(BaseClass && "neither field nor base"); 3246 S.Diag(Init->getSourceLocation(), 3247 diag::err_multiple_base_initialization) 3248 << QualType(BaseClass, 0) 3249 << Init->getSourceRange(); 3250 } 3251 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 3252 << 0 << PrevInit->getSourceRange(); 3253 3254 return true; 3255} 3256 3257typedef std::pair<NamedDecl *, CXXCtorInitializer *> UnionEntry; 3258typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 3259 3260bool CheckRedundantUnionInit(Sema &S, 3261 CXXCtorInitializer *Init, 3262 RedundantUnionMap &Unions) { 3263 FieldDecl *Field = Init->getAnyMember(); 3264 RecordDecl *Parent = Field->getParent(); 3265 NamedDecl *Child = Field; 3266 3267 while (Parent->isAnonymousStructOrUnion() || Parent->isUnion()) { 3268 if (Parent->isUnion()) { 3269 UnionEntry &En = Unions[Parent]; 3270 if (En.first && En.first != Child) { 3271 S.Diag(Init->getSourceLocation(), 3272 diag::err_multiple_mem_union_initialization) 3273 << Field->getDeclName() 3274 << Init->getSourceRange(); 3275 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 3276 << 0 << En.second->getSourceRange(); 3277 return true; 3278 } 3279 if (!En.first) { 3280 En.first = Child; 3281 En.second = Init; 3282 } 3283 if (!Parent->isAnonymousStructOrUnion()) 3284 return false; 3285 } 3286 3287 Child = Parent; 3288 Parent = cast<RecordDecl>(Parent->getDeclContext()); 3289 } 3290 3291 return false; 3292} 3293} 3294 3295/// ActOnMemInitializers - Handle the member initializers for a constructor. 3296void Sema::ActOnMemInitializers(Decl *ConstructorDecl, 3297 SourceLocation ColonLoc, 3298 CXXCtorInitializer **meminits, 3299 unsigned NumMemInits, 3300 bool AnyErrors) { 3301 if (!ConstructorDecl) 3302 return; 3303 3304 AdjustDeclIfTemplate(ConstructorDecl); 3305 3306 CXXConstructorDecl *Constructor 3307 = dyn_cast<CXXConstructorDecl>(ConstructorDecl); 3308 3309 if (!Constructor) { 3310 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 3311 return; 3312 } 3313 3314 CXXCtorInitializer **MemInits = 3315 reinterpret_cast<CXXCtorInitializer **>(meminits); 3316 3317 // Mapping for the duplicate initializers check. 3318 // For member initializers, this is keyed with a FieldDecl*. 3319 // For base initializers, this is keyed with a Type*. 3320 llvm::DenseMap<void*, CXXCtorInitializer *> Members; 3321 3322 // Mapping for the inconsistent anonymous-union initializers check. 3323 RedundantUnionMap MemberUnions; 3324 3325 bool HadError = false; 3326 for (unsigned i = 0; i < NumMemInits; i++) { 3327 CXXCtorInitializer *Init = MemInits[i]; 3328 3329 // Set the source order index. 3330 Init->setSourceOrder(i); 3331 3332 if (Init->isAnyMemberInitializer()) { 3333 FieldDecl *Field = Init->getAnyMember(); 3334 if (CheckRedundantInit(*this, Init, Members[Field]) || 3335 CheckRedundantUnionInit(*this, Init, MemberUnions)) 3336 HadError = true; 3337 } else if (Init->isBaseInitializer()) { 3338 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 3339 if (CheckRedundantInit(*this, Init, Members[Key])) 3340 HadError = true; 3341 } else { 3342 assert(Init->isDelegatingInitializer()); 3343 // This must be the only initializer 3344 if (i != 0 || NumMemInits > 1) { 3345 Diag(MemInits[0]->getSourceLocation(), 3346 diag::err_delegating_initializer_alone) 3347 << MemInits[0]->getSourceRange(); 3348 HadError = true; 3349 // We will treat this as being the only initializer. 3350 } 3351 SetDelegatingInitializer(Constructor, MemInits[i]); 3352 // Return immediately as the initializer is set. 3353 return; 3354 } 3355 } 3356 3357 if (HadError) 3358 return; 3359 3360 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 3361 3362 SetCtorInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 3363} 3364 3365void 3366Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 3367 CXXRecordDecl *ClassDecl) { 3368 // Ignore dependent contexts. Also ignore unions, since their members never 3369 // have destructors implicitly called. 3370 if (ClassDecl->isDependentContext() || ClassDecl->isUnion()) 3371 return; 3372 3373 // FIXME: all the access-control diagnostics are positioned on the 3374 // field/base declaration. That's probably good; that said, the 3375 // user might reasonably want to know why the destructor is being 3376 // emitted, and we currently don't say. 3377 3378 // Non-static data members. 3379 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 3380 E = ClassDecl->field_end(); I != E; ++I) { 3381 FieldDecl *Field = *I; 3382 if (Field->isInvalidDecl()) 3383 continue; 3384 3385 // Don't destroy incomplete or zero-length arrays. 3386 if (isIncompleteOrZeroLengthArrayType(Context, Field->getType())) 3387 continue; 3388 3389 QualType FieldType = Context.getBaseElementType(Field->getType()); 3390 3391 const RecordType* RT = FieldType->getAs<RecordType>(); 3392 if (!RT) 3393 continue; 3394 3395 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3396 if (FieldClassDecl->isInvalidDecl()) 3397 continue; 3398 if (FieldClassDecl->hasIrrelevantDestructor()) 3399 continue; 3400 // The destructor for an implicit anonymous union member is never invoked. 3401 if (FieldClassDecl->isUnion() && FieldClassDecl->isAnonymousStructOrUnion()) 3402 continue; 3403 3404 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl); 3405 assert(Dtor && "No dtor found for FieldClassDecl!"); 3406 CheckDestructorAccess(Field->getLocation(), Dtor, 3407 PDiag(diag::err_access_dtor_field) 3408 << Field->getDeclName() 3409 << FieldType); 3410 3411 MarkFunctionReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3412 DiagnoseUseOfDecl(Dtor, Location); 3413 } 3414 3415 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 3416 3417 // Bases. 3418 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3419 E = ClassDecl->bases_end(); Base != E; ++Base) { 3420 // Bases are always records in a well-formed non-dependent class. 3421 const RecordType *RT = Base->getType()->getAs<RecordType>(); 3422 3423 // Remember direct virtual bases. 3424 if (Base->isVirtual()) 3425 DirectVirtualBases.insert(RT); 3426 3427 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3428 // If our base class is invalid, we probably can't get its dtor anyway. 3429 if (BaseClassDecl->isInvalidDecl()) 3430 continue; 3431 if (BaseClassDecl->hasIrrelevantDestructor()) 3432 continue; 3433 3434 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 3435 assert(Dtor && "No dtor found for BaseClassDecl!"); 3436 3437 // FIXME: caret should be on the start of the class name 3438 CheckDestructorAccess(Base->getLocStart(), Dtor, 3439 PDiag(diag::err_access_dtor_base) 3440 << Base->getType() 3441 << Base->getSourceRange(), 3442 Context.getTypeDeclType(ClassDecl)); 3443 3444 MarkFunctionReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3445 DiagnoseUseOfDecl(Dtor, Location); 3446 } 3447 3448 // Virtual bases. 3449 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 3450 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 3451 3452 // Bases are always records in a well-formed non-dependent class. 3453 const RecordType *RT = VBase->getType()->castAs<RecordType>(); 3454 3455 // Ignore direct virtual bases. 3456 if (DirectVirtualBases.count(RT)) 3457 continue; 3458 3459 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3460 // If our base class is invalid, we probably can't get its dtor anyway. 3461 if (BaseClassDecl->isInvalidDecl()) 3462 continue; 3463 if (BaseClassDecl->hasIrrelevantDestructor()) 3464 continue; 3465 3466 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 3467 assert(Dtor && "No dtor found for BaseClassDecl!"); 3468 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 3469 PDiag(diag::err_access_dtor_vbase) 3470 << VBase->getType(), 3471 Context.getTypeDeclType(ClassDecl)); 3472 3473 MarkFunctionReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3474 DiagnoseUseOfDecl(Dtor, Location); 3475 } 3476} 3477 3478void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) { 3479 if (!CDtorDecl) 3480 return; 3481 3482 if (CXXConstructorDecl *Constructor 3483 = dyn_cast<CXXConstructorDecl>(CDtorDecl)) 3484 SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 3485} 3486 3487bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 3488 unsigned DiagID, AbstractDiagSelID SelID) { 3489 class NonAbstractTypeDiagnoser : public TypeDiagnoser { 3490 unsigned DiagID; 3491 AbstractDiagSelID SelID; 3492 3493 public: 3494 NonAbstractTypeDiagnoser(unsigned DiagID, AbstractDiagSelID SelID) 3495 : TypeDiagnoser(DiagID == 0), DiagID(DiagID), SelID(SelID) { } 3496 3497 virtual void diagnose(Sema &S, SourceLocation Loc, QualType T) { 3498 if (Suppressed) return; 3499 if (SelID == -1) 3500 S.Diag(Loc, DiagID) << T; 3501 else 3502 S.Diag(Loc, DiagID) << SelID << T; 3503 } 3504 } Diagnoser(DiagID, SelID); 3505 3506 return RequireNonAbstractType(Loc, T, Diagnoser); 3507} 3508 3509bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 3510 TypeDiagnoser &Diagnoser) { 3511 if (!getLangOpts().CPlusPlus) 3512 return false; 3513 3514 if (const ArrayType *AT = Context.getAsArrayType(T)) 3515 return RequireNonAbstractType(Loc, AT->getElementType(), Diagnoser); 3516 3517 if (const PointerType *PT = T->getAs<PointerType>()) { 3518 // Find the innermost pointer type. 3519 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 3520 PT = T; 3521 3522 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 3523 return RequireNonAbstractType(Loc, AT->getElementType(), Diagnoser); 3524 } 3525 3526 const RecordType *RT = T->getAs<RecordType>(); 3527 if (!RT) 3528 return false; 3529 3530 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 3531 3532 // We can't answer whether something is abstract until it has a 3533 // definition. If it's currently being defined, we'll walk back 3534 // over all the declarations when we have a full definition. 3535 const CXXRecordDecl *Def = RD->getDefinition(); 3536 if (!Def || Def->isBeingDefined()) 3537 return false; 3538 3539 if (!RD->isAbstract()) 3540 return false; 3541 3542 Diagnoser.diagnose(*this, Loc, T); 3543 DiagnoseAbstractType(RD); 3544 3545 return true; 3546} 3547 3548void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) { 3549 // Check if we've already emitted the list of pure virtual functions 3550 // for this class. 3551 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 3552 return; 3553 3554 CXXFinalOverriderMap FinalOverriders; 3555 RD->getFinalOverriders(FinalOverriders); 3556 3557 // Keep a set of seen pure methods so we won't diagnose the same method 3558 // more than once. 3559 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; 3560 3561 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 3562 MEnd = FinalOverriders.end(); 3563 M != MEnd; 3564 ++M) { 3565 for (OverridingMethods::iterator SO = M->second.begin(), 3566 SOEnd = M->second.end(); 3567 SO != SOEnd; ++SO) { 3568 // C++ [class.abstract]p4: 3569 // A class is abstract if it contains or inherits at least one 3570 // pure virtual function for which the final overrider is pure 3571 // virtual. 3572 3573 // 3574 if (SO->second.size() != 1) 3575 continue; 3576 3577 if (!SO->second.front().Method->isPure()) 3578 continue; 3579 3580 if (!SeenPureMethods.insert(SO->second.front().Method)) 3581 continue; 3582 3583 Diag(SO->second.front().Method->getLocation(), 3584 diag::note_pure_virtual_function) 3585 << SO->second.front().Method->getDeclName() << RD->getDeclName(); 3586 } 3587 } 3588 3589 if (!PureVirtualClassDiagSet) 3590 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 3591 PureVirtualClassDiagSet->insert(RD); 3592} 3593 3594namespace { 3595struct AbstractUsageInfo { 3596 Sema &S; 3597 CXXRecordDecl *Record; 3598 CanQualType AbstractType; 3599 bool Invalid; 3600 3601 AbstractUsageInfo(Sema &S, CXXRecordDecl *Record) 3602 : S(S), Record(Record), 3603 AbstractType(S.Context.getCanonicalType( 3604 S.Context.getTypeDeclType(Record))), 3605 Invalid(false) {} 3606 3607 void DiagnoseAbstractType() { 3608 if (Invalid) return; 3609 S.DiagnoseAbstractType(Record); 3610 Invalid = true; 3611 } 3612 3613 void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel); 3614}; 3615 3616struct CheckAbstractUsage { 3617 AbstractUsageInfo &Info; 3618 const NamedDecl *Ctx; 3619 3620 CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx) 3621 : Info(Info), Ctx(Ctx) {} 3622 3623 void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 3624 switch (TL.getTypeLocClass()) { 3625#define ABSTRACT_TYPELOC(CLASS, PARENT) 3626#define TYPELOC(CLASS, PARENT) \ 3627 case TypeLoc::CLASS: Check(cast<CLASS##TypeLoc>(TL), Sel); break; 3628#include "clang/AST/TypeLocNodes.def" 3629 } 3630 } 3631 3632 void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3633 Visit(TL.getResultLoc(), Sema::AbstractReturnType); 3634 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 3635 if (!TL.getArg(I)) 3636 continue; 3637 3638 TypeSourceInfo *TSI = TL.getArg(I)->getTypeSourceInfo(); 3639 if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType); 3640 } 3641 } 3642 3643 void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3644 Visit(TL.getElementLoc(), Sema::AbstractArrayType); 3645 } 3646 3647 void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3648 // Visit the type parameters from a permissive context. 3649 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 3650 TemplateArgumentLoc TAL = TL.getArgLoc(I); 3651 if (TAL.getArgument().getKind() == TemplateArgument::Type) 3652 if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo()) 3653 Visit(TSI->getTypeLoc(), Sema::AbstractNone); 3654 // TODO: other template argument types? 3655 } 3656 } 3657 3658 // Visit pointee types from a permissive context. 3659#define CheckPolymorphic(Type) \ 3660 void Check(Type TL, Sema::AbstractDiagSelID Sel) { \ 3661 Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \ 3662 } 3663 CheckPolymorphic(PointerTypeLoc) 3664 CheckPolymorphic(ReferenceTypeLoc) 3665 CheckPolymorphic(MemberPointerTypeLoc) 3666 CheckPolymorphic(BlockPointerTypeLoc) 3667 CheckPolymorphic(AtomicTypeLoc) 3668 3669 /// Handle all the types we haven't given a more specific 3670 /// implementation for above. 3671 void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 3672 // Every other kind of type that we haven't called out already 3673 // that has an inner type is either (1) sugar or (2) contains that 3674 // inner type in some way as a subobject. 3675 if (TypeLoc Next = TL.getNextTypeLoc()) 3676 return Visit(Next, Sel); 3677 3678 // If there's no inner type and we're in a permissive context, 3679 // don't diagnose. 3680 if (Sel == Sema::AbstractNone) return; 3681 3682 // Check whether the type matches the abstract type. 3683 QualType T = TL.getType(); 3684 if (T->isArrayType()) { 3685 Sel = Sema::AbstractArrayType; 3686 T = Info.S.Context.getBaseElementType(T); 3687 } 3688 CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType(); 3689 if (CT != Info.AbstractType) return; 3690 3691 // It matched; do some magic. 3692 if (Sel == Sema::AbstractArrayType) { 3693 Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type) 3694 << T << TL.getSourceRange(); 3695 } else { 3696 Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl) 3697 << Sel << T << TL.getSourceRange(); 3698 } 3699 Info.DiagnoseAbstractType(); 3700 } 3701}; 3702 3703void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL, 3704 Sema::AbstractDiagSelID Sel) { 3705 CheckAbstractUsage(*this, D).Visit(TL, Sel); 3706} 3707 3708} 3709 3710/// Check for invalid uses of an abstract type in a method declaration. 3711static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 3712 CXXMethodDecl *MD) { 3713 // No need to do the check on definitions, which require that 3714 // the return/param types be complete. 3715 if (MD->doesThisDeclarationHaveABody()) 3716 return; 3717 3718 // For safety's sake, just ignore it if we don't have type source 3719 // information. This should never happen for non-implicit methods, 3720 // but... 3721 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo()) 3722 Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone); 3723} 3724 3725/// Check for invalid uses of an abstract type within a class definition. 3726static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 3727 CXXRecordDecl *RD) { 3728 for (CXXRecordDecl::decl_iterator 3729 I = RD->decls_begin(), E = RD->decls_end(); I != E; ++I) { 3730 Decl *D = *I; 3731 if (D->isImplicit()) continue; 3732 3733 // Methods and method templates. 3734 if (isa<CXXMethodDecl>(D)) { 3735 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D)); 3736 } else if (isa<FunctionTemplateDecl>(D)) { 3737 FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl(); 3738 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD)); 3739 3740 // Fields and static variables. 3741 } else if (isa<FieldDecl>(D)) { 3742 FieldDecl *FD = cast<FieldDecl>(D); 3743 if (TypeSourceInfo *TSI = FD->getTypeSourceInfo()) 3744 Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType); 3745 } else if (isa<VarDecl>(D)) { 3746 VarDecl *VD = cast<VarDecl>(D); 3747 if (TypeSourceInfo *TSI = VD->getTypeSourceInfo()) 3748 Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType); 3749 3750 // Nested classes and class templates. 3751 } else if (isa<CXXRecordDecl>(D)) { 3752 CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D)); 3753 } else if (isa<ClassTemplateDecl>(D)) { 3754 CheckAbstractClassUsage(Info, 3755 cast<ClassTemplateDecl>(D)->getTemplatedDecl()); 3756 } 3757 } 3758} 3759 3760/// \brief Perform semantic checks on a class definition that has been 3761/// completing, introducing implicitly-declared members, checking for 3762/// abstract types, etc. 3763void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 3764 if (!Record) 3765 return; 3766 3767 if (Record->isAbstract() && !Record->isInvalidDecl()) { 3768 AbstractUsageInfo Info(*this, Record); 3769 CheckAbstractClassUsage(Info, Record); 3770 } 3771 3772 // If this is not an aggregate type and has no user-declared constructor, 3773 // complain about any non-static data members of reference or const scalar 3774 // type, since they will never get initializers. 3775 if (!Record->isInvalidDecl() && !Record->isDependentType() && 3776 !Record->isAggregate() && !Record->hasUserDeclaredConstructor() && 3777 !Record->isLambda()) { 3778 bool Complained = false; 3779 for (RecordDecl::field_iterator F = Record->field_begin(), 3780 FEnd = Record->field_end(); 3781 F != FEnd; ++F) { 3782 if (F->hasInClassInitializer() || F->isUnnamedBitfield()) 3783 continue; 3784 3785 if (F->getType()->isReferenceType() || 3786 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 3787 if (!Complained) { 3788 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 3789 << Record->getTagKind() << Record; 3790 Complained = true; 3791 } 3792 3793 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 3794 << F->getType()->isReferenceType() 3795 << F->getDeclName(); 3796 } 3797 } 3798 } 3799 3800 if (Record->isDynamicClass() && !Record->isDependentType()) 3801 DynamicClasses.push_back(Record); 3802 3803 if (Record->getIdentifier()) { 3804 // C++ [class.mem]p13: 3805 // If T is the name of a class, then each of the following shall have a 3806 // name different from T: 3807 // - every member of every anonymous union that is a member of class T. 3808 // 3809 // C++ [class.mem]p14: 3810 // In addition, if class T has a user-declared constructor (12.1), every 3811 // non-static data member of class T shall have a name different from T. 3812 for (DeclContext::lookup_result R = Record->lookup(Record->getDeclName()); 3813 R.first != R.second; ++R.first) { 3814 NamedDecl *D = *R.first; 3815 if ((isa<FieldDecl>(D) && Record->hasUserDeclaredConstructor()) || 3816 isa<IndirectFieldDecl>(D)) { 3817 Diag(D->getLocation(), diag::err_member_name_of_class) 3818 << D->getDeclName(); 3819 break; 3820 } 3821 } 3822 } 3823 3824 // Warn if the class has virtual methods but non-virtual public destructor. 3825 if (Record->isPolymorphic() && !Record->isDependentType()) { 3826 CXXDestructorDecl *dtor = Record->getDestructor(); 3827 if (!dtor || (!dtor->isVirtual() && dtor->getAccess() == AS_public)) 3828 Diag(dtor ? dtor->getLocation() : Record->getLocation(), 3829 diag::warn_non_virtual_dtor) << Context.getRecordType(Record); 3830 } 3831 3832 // See if a method overloads virtual methods in a base 3833 /// class without overriding any. 3834 if (!Record->isDependentType()) { 3835 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 3836 MEnd = Record->method_end(); 3837 M != MEnd; ++M) { 3838 if (!M->isStatic()) 3839 DiagnoseHiddenVirtualMethods(Record, *M); 3840 } 3841 } 3842 3843 // C++0x [dcl.constexpr]p8: A constexpr specifier for a non-static member 3844 // function that is not a constructor declares that member function to be 3845 // const. [...] The class of which that function is a member shall be 3846 // a literal type. 3847 // 3848 // If the class has virtual bases, any constexpr members will already have 3849 // been diagnosed by the checks performed on the member declaration, so 3850 // suppress this (less useful) diagnostic. 3851 if (LangOpts.CPlusPlus0x && !Record->isDependentType() && 3852 !Record->isLiteral() && !Record->getNumVBases()) { 3853 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 3854 MEnd = Record->method_end(); 3855 M != MEnd; ++M) { 3856 if (M->isConstexpr() && M->isInstance() && !isa<CXXConstructorDecl>(*M)) { 3857 switch (Record->getTemplateSpecializationKind()) { 3858 case TSK_ImplicitInstantiation: 3859 case TSK_ExplicitInstantiationDeclaration: 3860 case TSK_ExplicitInstantiationDefinition: 3861 // If a template instantiates to a non-literal type, but its members 3862 // instantiate to constexpr functions, the template is technically 3863 // ill-formed, but we allow it for sanity. 3864 continue; 3865 3866 case TSK_Undeclared: 3867 case TSK_ExplicitSpecialization: 3868 RequireLiteralType(M->getLocation(), Context.getRecordType(Record), 3869 diag::err_constexpr_method_non_literal); 3870 break; 3871 } 3872 3873 // Only produce one error per class. 3874 break; 3875 } 3876 } 3877 } 3878 3879 // Declare inherited constructors. We do this eagerly here because: 3880 // - The standard requires an eager diagnostic for conflicting inherited 3881 // constructors from different classes. 3882 // - The lazy declaration of the other implicit constructors is so as to not 3883 // waste space and performance on classes that are not meant to be 3884 // instantiated (e.g. meta-functions). This doesn't apply to classes that 3885 // have inherited constructors. 3886 DeclareInheritedConstructors(Record); 3887} 3888 3889void Sema::CheckExplicitlyDefaultedMethods(CXXRecordDecl *Record) { 3890 for (CXXRecordDecl::method_iterator MI = Record->method_begin(), 3891 ME = Record->method_end(); 3892 MI != ME; ++MI) 3893 if (!MI->isInvalidDecl() && MI->isExplicitlyDefaulted()) 3894 CheckExplicitlyDefaultedSpecialMember(*MI); 3895} 3896 3897/// Is the special member function which would be selected to perform the 3898/// specified operation on the specified class type a constexpr constructor? 3899static bool specialMemberIsConstexpr(Sema &S, CXXRecordDecl *ClassDecl, 3900 Sema::CXXSpecialMember CSM, 3901 bool ConstArg) { 3902 Sema::SpecialMemberOverloadResult *SMOR = 3903 S.LookupSpecialMember(ClassDecl, CSM, ConstArg, 3904 false, false, false, false); 3905 if (!SMOR || !SMOR->getMethod()) 3906 // A constructor we wouldn't select can't be "involved in initializing" 3907 // anything. 3908 return true; 3909 return SMOR->getMethod()->isConstexpr(); 3910} 3911 3912/// Determine whether the specified special member function would be constexpr 3913/// if it were implicitly defined. 3914static bool defaultedSpecialMemberIsConstexpr(Sema &S, CXXRecordDecl *ClassDecl, 3915 Sema::CXXSpecialMember CSM, 3916 bool ConstArg) { 3917 if (!S.getLangOpts().CPlusPlus0x) 3918 return false; 3919 3920 // C++11 [dcl.constexpr]p4: 3921 // In the definition of a constexpr constructor [...] 3922 switch (CSM) { 3923 case Sema::CXXDefaultConstructor: 3924 // Since default constructor lookup is essentially trivial (and cannot 3925 // involve, for instance, template instantiation), we compute whether a 3926 // defaulted default constructor is constexpr directly within CXXRecordDecl. 3927 // 3928 // This is important for performance; we need to know whether the default 3929 // constructor is constexpr to determine whether the type is a literal type. 3930 return ClassDecl->defaultedDefaultConstructorIsConstexpr(); 3931 3932 case Sema::CXXCopyConstructor: 3933 case Sema::CXXMoveConstructor: 3934 // For copy or move constructors, we need to perform overload resolution. 3935 break; 3936 3937 case Sema::CXXCopyAssignment: 3938 case Sema::CXXMoveAssignment: 3939 case Sema::CXXDestructor: 3940 case Sema::CXXInvalid: 3941 return false; 3942 } 3943 3944 // -- if the class is a non-empty union, or for each non-empty anonymous 3945 // union member of a non-union class, exactly one non-static data member 3946 // shall be initialized; [DR1359] 3947 // 3948 // If we squint, this is guaranteed, since exactly one non-static data member 3949 // will be initialized (if the constructor isn't deleted), we just don't know 3950 // which one. 3951 if (ClassDecl->isUnion()) 3952 return true; 3953 3954 // -- the class shall not have any virtual base classes; 3955 if (ClassDecl->getNumVBases()) 3956 return false; 3957 3958 // -- every constructor involved in initializing [...] base class 3959 // sub-objects shall be a constexpr constructor; 3960 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 3961 BEnd = ClassDecl->bases_end(); 3962 B != BEnd; ++B) { 3963 const RecordType *BaseType = B->getType()->getAs<RecordType>(); 3964 if (!BaseType) continue; 3965 3966 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 3967 if (!specialMemberIsConstexpr(S, BaseClassDecl, CSM, ConstArg)) 3968 return false; 3969 } 3970 3971 // -- every constructor involved in initializing non-static data members 3972 // [...] shall be a constexpr constructor; 3973 // -- every non-static data member and base class sub-object shall be 3974 // initialized 3975 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 3976 FEnd = ClassDecl->field_end(); 3977 F != FEnd; ++F) { 3978 if (F->isInvalidDecl()) 3979 continue; 3980 if (const RecordType *RecordTy = 3981 S.Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 3982 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 3983 if (!specialMemberIsConstexpr(S, FieldRecDecl, CSM, ConstArg)) 3984 return false; 3985 } 3986 } 3987 3988 // All OK, it's constexpr! 3989 return true; 3990} 3991 3992static Sema::ImplicitExceptionSpecification 3993computeImplicitExceptionSpec(Sema &S, SourceLocation Loc, CXXMethodDecl *MD) { 3994 switch (S.getSpecialMember(MD)) { 3995 case Sema::CXXDefaultConstructor: 3996 return S.ComputeDefaultedDefaultCtorExceptionSpec(Loc, MD); 3997 case Sema::CXXCopyConstructor: 3998 return S.ComputeDefaultedCopyCtorExceptionSpec(MD); 3999 case Sema::CXXCopyAssignment: 4000 return S.ComputeDefaultedCopyAssignmentExceptionSpec(MD); 4001 case Sema::CXXMoveConstructor: 4002 return S.ComputeDefaultedMoveCtorExceptionSpec(MD); 4003 case Sema::CXXMoveAssignment: 4004 return S.ComputeDefaultedMoveAssignmentExceptionSpec(MD); 4005 case Sema::CXXDestructor: 4006 return S.ComputeDefaultedDtorExceptionSpec(MD); 4007 case Sema::CXXInvalid: 4008 break; 4009 } 4010 llvm_unreachable("only special members have implicit exception specs"); 4011} 4012 4013static void 4014updateExceptionSpec(Sema &S, FunctionDecl *FD, const FunctionProtoType *FPT, 4015 const Sema::ImplicitExceptionSpecification &ExceptSpec) { 4016 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo(); 4017 ExceptSpec.getEPI(EPI); 4018 const FunctionProtoType *NewFPT = cast<FunctionProtoType>( 4019 S.Context.getFunctionType(FPT->getResultType(), FPT->arg_type_begin(), 4020 FPT->getNumArgs(), EPI)); 4021 FD->setType(QualType(NewFPT, 0)); 4022} 4023 4024void Sema::EvaluateImplicitExceptionSpec(SourceLocation Loc, CXXMethodDecl *MD) { 4025 const FunctionProtoType *FPT = MD->getType()->castAs<FunctionProtoType>(); 4026 if (FPT->getExceptionSpecType() != EST_Unevaluated) 4027 return; 4028 4029 // Evaluate the exception specification. 4030 ImplicitExceptionSpecification ExceptSpec = 4031 computeImplicitExceptionSpec(*this, Loc, MD); 4032 4033 // Update the type of the special member to use it. 4034 updateExceptionSpec(*this, MD, FPT, ExceptSpec); 4035 4036 // A user-provided destructor can be defined outside the class. When that 4037 // happens, be sure to update the exception specification on both 4038 // declarations. 4039 const FunctionProtoType *CanonicalFPT = 4040 MD->getCanonicalDecl()->getType()->castAs<FunctionProtoType>(); 4041 if (CanonicalFPT->getExceptionSpecType() == EST_Unevaluated) 4042 updateExceptionSpec(*this, MD->getCanonicalDecl(), 4043 CanonicalFPT, ExceptSpec); 4044} 4045 4046static bool isImplicitCopyCtorArgConst(Sema &S, CXXRecordDecl *ClassDecl); 4047static bool isImplicitCopyAssignmentArgConst(Sema &S, CXXRecordDecl *ClassDecl); 4048 4049void Sema::CheckExplicitlyDefaultedSpecialMember(CXXMethodDecl *MD) { 4050 CXXRecordDecl *RD = MD->getParent(); 4051 CXXSpecialMember CSM = getSpecialMember(MD); 4052 4053 assert(MD->isExplicitlyDefaulted() && CSM != CXXInvalid && 4054 "not an explicitly-defaulted special member"); 4055 4056 // Whether this was the first-declared instance of the constructor. 4057 // This affects whether we implicitly add an exception spec and constexpr. 4058 bool First = MD == MD->getCanonicalDecl(); 4059 4060 bool HadError = false; 4061 4062 // C++11 [dcl.fct.def.default]p1: 4063 // A function that is explicitly defaulted shall 4064 // -- be a special member function (checked elsewhere), 4065 // -- have the same type (except for ref-qualifiers, and except that a 4066 // copy operation can take a non-const reference) as an implicit 4067 // declaration, and 4068 // -- not have default arguments. 4069 unsigned ExpectedParams = 1; 4070 if (CSM == CXXDefaultConstructor || CSM == CXXDestructor) 4071 ExpectedParams = 0; 4072 if (MD->getNumParams() != ExpectedParams) { 4073 // This also checks for default arguments: a copy or move constructor with a 4074 // default argument is classified as a default constructor, and assignment 4075 // operations and destructors can't have default arguments. 4076 Diag(MD->getLocation(), diag::err_defaulted_special_member_params) 4077 << CSM << MD->getSourceRange(); 4078 HadError = true; 4079 } 4080 4081 const FunctionProtoType *Type = MD->getType()->getAs<FunctionProtoType>(); 4082 4083 // Compute argument constness, constexpr, and triviality. 4084 bool CanHaveConstParam = false; 4085 bool Trivial; 4086 switch (CSM) { 4087 case CXXDefaultConstructor: 4088 Trivial = RD->hasTrivialDefaultConstructor(); 4089 break; 4090 case CXXCopyConstructor: 4091 CanHaveConstParam = isImplicitCopyCtorArgConst(*this, RD); 4092 Trivial = RD->hasTrivialCopyConstructor(); 4093 break; 4094 case CXXCopyAssignment: 4095 CanHaveConstParam = isImplicitCopyAssignmentArgConst(*this, RD); 4096 Trivial = RD->hasTrivialCopyAssignment(); 4097 break; 4098 case CXXMoveConstructor: 4099 Trivial = RD->hasTrivialMoveConstructor(); 4100 break; 4101 case CXXMoveAssignment: 4102 Trivial = RD->hasTrivialMoveAssignment(); 4103 break; 4104 case CXXDestructor: 4105 Trivial = RD->hasTrivialDestructor(); 4106 break; 4107 case CXXInvalid: 4108 llvm_unreachable("non-special member explicitly defaulted!"); 4109 } 4110 4111 QualType ReturnType = Context.VoidTy; 4112 if (CSM == CXXCopyAssignment || CSM == CXXMoveAssignment) { 4113 // Check for return type matching. 4114 ReturnType = Type->getResultType(); 4115 QualType ExpectedReturnType = 4116 Context.getLValueReferenceType(Context.getTypeDeclType(RD)); 4117 if (!Context.hasSameType(ReturnType, ExpectedReturnType)) { 4118 Diag(MD->getLocation(), diag::err_defaulted_special_member_return_type) 4119 << (CSM == CXXMoveAssignment) << ExpectedReturnType; 4120 HadError = true; 4121 } 4122 4123 // A defaulted special member cannot have cv-qualifiers. 4124 if (Type->getTypeQuals()) { 4125 Diag(MD->getLocation(), diag::err_defaulted_special_member_quals) 4126 << (CSM == CXXMoveAssignment); 4127 HadError = true; 4128 } 4129 } 4130 4131 // Check for parameter type matching. 4132 QualType ArgType = ExpectedParams ? Type->getArgType(0) : QualType(); 4133 bool HasConstParam = false; 4134 if (ExpectedParams && ArgType->isReferenceType()) { 4135 // Argument must be reference to possibly-const T. 4136 QualType ReferentType = ArgType->getPointeeType(); 4137 HasConstParam = ReferentType.isConstQualified(); 4138 4139 if (ReferentType.isVolatileQualified()) { 4140 Diag(MD->getLocation(), 4141 diag::err_defaulted_special_member_volatile_param) << CSM; 4142 HadError = true; 4143 } 4144 4145 if (HasConstParam && !CanHaveConstParam) { 4146 if (CSM == CXXCopyConstructor || CSM == CXXCopyAssignment) { 4147 Diag(MD->getLocation(), 4148 diag::err_defaulted_special_member_copy_const_param) 4149 << (CSM == CXXCopyAssignment); 4150 // FIXME: Explain why this special member can't be const. 4151 } else { 4152 Diag(MD->getLocation(), 4153 diag::err_defaulted_special_member_move_const_param) 4154 << (CSM == CXXMoveAssignment); 4155 } 4156 HadError = true; 4157 } 4158 4159 // If a function is explicitly defaulted on its first declaration, it shall 4160 // have the same parameter type as if it had been implicitly declared. 4161 // (Presumably this is to prevent it from being trivial?) 4162 if (!HasConstParam && CanHaveConstParam && First) 4163 Diag(MD->getLocation(), 4164 diag::err_defaulted_special_member_copy_non_const_param) 4165 << (CSM == CXXCopyAssignment); 4166 } else if (ExpectedParams) { 4167 // A copy assignment operator can take its argument by value, but a 4168 // defaulted one cannot. 4169 assert(CSM == CXXCopyAssignment && "unexpected non-ref argument"); 4170 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_not_ref); 4171 HadError = true; 4172 } 4173 4174 // Rebuild the type with the implicit exception specification added, if we 4175 // are going to need it. 4176 const FunctionProtoType *ImplicitType = 0; 4177 if (First || Type->hasExceptionSpec()) { 4178 FunctionProtoType::ExtProtoInfo EPI = Type->getExtProtoInfo(); 4179 computeImplicitExceptionSpec(*this, MD->getLocation(), MD).getEPI(EPI); 4180 ImplicitType = cast<FunctionProtoType>( 4181 Context.getFunctionType(ReturnType, &ArgType, ExpectedParams, EPI)); 4182 } 4183 4184 // C++11 [dcl.fct.def.default]p2: 4185 // An explicitly-defaulted function may be declared constexpr only if it 4186 // would have been implicitly declared as constexpr, 4187 // Do not apply this rule to members of class templates, since core issue 1358 4188 // makes such functions always instantiate to constexpr functions. For 4189 // non-constructors, this is checked elsewhere. 4190 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, RD, CSM, 4191 HasConstParam); 4192 if (isa<CXXConstructorDecl>(MD) && MD->isConstexpr() && !Constexpr && 4193 MD->getTemplatedKind() == FunctionDecl::TK_NonTemplate) { 4194 Diag(MD->getLocStart(), diag::err_incorrect_defaulted_constexpr) << CSM; 4195 // FIXME: Explain why the constructor can't be constexpr. 4196 HadError = true; 4197 } 4198 // and may have an explicit exception-specification only if it is compatible 4199 // with the exception-specification on the implicit declaration. 4200 if (Type->hasExceptionSpec() && 4201 CheckEquivalentExceptionSpec( 4202 PDiag(diag::err_incorrect_defaulted_exception_spec) << CSM, 4203 PDiag(), ImplicitType, SourceLocation(), Type, MD->getLocation())) 4204 HadError = true; 4205 4206 // If a function is explicitly defaulted on its first declaration, 4207 if (First) { 4208 // -- it is implicitly considered to be constexpr if the implicit 4209 // definition would be, 4210 MD->setConstexpr(Constexpr); 4211 4212 // -- it is implicitly considered to have the same exception-specification 4213 // as if it had been implicitly declared, 4214 MD->setType(QualType(ImplicitType, 0)); 4215 4216 // Such a function is also trivial if the implicitly-declared function 4217 // would have been. 4218 MD->setTrivial(Trivial); 4219 } 4220 4221 if (ShouldDeleteSpecialMember(MD, CSM)) { 4222 if (First) { 4223 MD->setDeletedAsWritten(); 4224 } else { 4225 // C++11 [dcl.fct.def.default]p4: 4226 // [For a] user-provided explicitly-defaulted function [...] if such a 4227 // function is implicitly defined as deleted, the program is ill-formed. 4228 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) << CSM; 4229 HadError = true; 4230 } 4231 } 4232 4233 if (HadError) 4234 MD->setInvalidDecl(); 4235} 4236 4237namespace { 4238struct SpecialMemberDeletionInfo { 4239 Sema &S; 4240 CXXMethodDecl *MD; 4241 Sema::CXXSpecialMember CSM; 4242 bool Diagnose; 4243 4244 // Properties of the special member, computed for convenience. 4245 bool IsConstructor, IsAssignment, IsMove, ConstArg, VolatileArg; 4246 SourceLocation Loc; 4247 4248 bool AllFieldsAreConst; 4249 4250 SpecialMemberDeletionInfo(Sema &S, CXXMethodDecl *MD, 4251 Sema::CXXSpecialMember CSM, bool Diagnose) 4252 : S(S), MD(MD), CSM(CSM), Diagnose(Diagnose), 4253 IsConstructor(false), IsAssignment(false), IsMove(false), 4254 ConstArg(false), VolatileArg(false), Loc(MD->getLocation()), 4255 AllFieldsAreConst(true) { 4256 switch (CSM) { 4257 case Sema::CXXDefaultConstructor: 4258 case Sema::CXXCopyConstructor: 4259 IsConstructor = true; 4260 break; 4261 case Sema::CXXMoveConstructor: 4262 IsConstructor = true; 4263 IsMove = true; 4264 break; 4265 case Sema::CXXCopyAssignment: 4266 IsAssignment = true; 4267 break; 4268 case Sema::CXXMoveAssignment: 4269 IsAssignment = true; 4270 IsMove = true; 4271 break; 4272 case Sema::CXXDestructor: 4273 break; 4274 case Sema::CXXInvalid: 4275 llvm_unreachable("invalid special member kind"); 4276 } 4277 4278 if (MD->getNumParams()) { 4279 ConstArg = MD->getParamDecl(0)->getType().isConstQualified(); 4280 VolatileArg = MD->getParamDecl(0)->getType().isVolatileQualified(); 4281 } 4282 } 4283 4284 bool inUnion() const { return MD->getParent()->isUnion(); } 4285 4286 /// Look up the corresponding special member in the given class. 4287 Sema::SpecialMemberOverloadResult *lookupIn(CXXRecordDecl *Class, 4288 unsigned Quals) { 4289 unsigned TQ = MD->getTypeQualifiers(); 4290 // cv-qualifiers on class members don't affect default ctor / dtor calls. 4291 if (CSM == Sema::CXXDefaultConstructor || CSM == Sema::CXXDestructor) 4292 Quals = 0; 4293 return S.LookupSpecialMember(Class, CSM, 4294 ConstArg || (Quals & Qualifiers::Const), 4295 VolatileArg || (Quals & Qualifiers::Volatile), 4296 MD->getRefQualifier() == RQ_RValue, 4297 TQ & Qualifiers::Const, 4298 TQ & Qualifiers::Volatile); 4299 } 4300 4301 typedef llvm::PointerUnion<CXXBaseSpecifier*, FieldDecl*> Subobject; 4302 4303 bool shouldDeleteForBase(CXXBaseSpecifier *Base); 4304 bool shouldDeleteForField(FieldDecl *FD); 4305 bool shouldDeleteForAllConstMembers(); 4306 4307 bool shouldDeleteForClassSubobject(CXXRecordDecl *Class, Subobject Subobj, 4308 unsigned Quals); 4309 bool shouldDeleteForSubobjectCall(Subobject Subobj, 4310 Sema::SpecialMemberOverloadResult *SMOR, 4311 bool IsDtorCallInCtor); 4312 4313 bool isAccessible(Subobject Subobj, CXXMethodDecl *D); 4314}; 4315} 4316 4317/// Is the given special member inaccessible when used on the given 4318/// sub-object. 4319bool SpecialMemberDeletionInfo::isAccessible(Subobject Subobj, 4320 CXXMethodDecl *target) { 4321 /// If we're operating on a base class, the object type is the 4322 /// type of this special member. 4323 QualType objectTy; 4324 AccessSpecifier access = target->getAccess();; 4325 if (CXXBaseSpecifier *base = Subobj.dyn_cast<CXXBaseSpecifier*>()) { 4326 objectTy = S.Context.getTypeDeclType(MD->getParent()); 4327 access = CXXRecordDecl::MergeAccess(base->getAccessSpecifier(), access); 4328 4329 // If we're operating on a field, the object type is the type of the field. 4330 } else { 4331 objectTy = S.Context.getTypeDeclType(target->getParent()); 4332 } 4333 4334 return S.isSpecialMemberAccessibleForDeletion(target, access, objectTy); 4335} 4336 4337/// Check whether we should delete a special member due to the implicit 4338/// definition containing a call to a special member of a subobject. 4339bool SpecialMemberDeletionInfo::shouldDeleteForSubobjectCall( 4340 Subobject Subobj, Sema::SpecialMemberOverloadResult *SMOR, 4341 bool IsDtorCallInCtor) { 4342 CXXMethodDecl *Decl = SMOR->getMethod(); 4343 FieldDecl *Field = Subobj.dyn_cast<FieldDecl*>(); 4344 4345 int DiagKind = -1; 4346 4347 if (SMOR->getKind() == Sema::SpecialMemberOverloadResult::NoMemberOrDeleted) 4348 DiagKind = !Decl ? 0 : 1; 4349 else if (SMOR->getKind() == Sema::SpecialMemberOverloadResult::Ambiguous) 4350 DiagKind = 2; 4351 else if (!isAccessible(Subobj, Decl)) 4352 DiagKind = 3; 4353 else if (!IsDtorCallInCtor && Field && Field->getParent()->isUnion() && 4354 !Decl->isTrivial()) { 4355 // A member of a union must have a trivial corresponding special member. 4356 // As a weird special case, a destructor call from a union's constructor 4357 // must be accessible and non-deleted, but need not be trivial. Such a 4358 // destructor is never actually called, but is semantically checked as 4359 // if it were. 4360 DiagKind = 4; 4361 } 4362 4363 if (DiagKind == -1) 4364 return false; 4365 4366 if (Diagnose) { 4367 if (Field) { 4368 S.Diag(Field->getLocation(), 4369 diag::note_deleted_special_member_class_subobject) 4370 << CSM << MD->getParent() << /*IsField*/true 4371 << Field << DiagKind << IsDtorCallInCtor; 4372 } else { 4373 CXXBaseSpecifier *Base = Subobj.get<CXXBaseSpecifier*>(); 4374 S.Diag(Base->getLocStart(), 4375 diag::note_deleted_special_member_class_subobject) 4376 << CSM << MD->getParent() << /*IsField*/false 4377 << Base->getType() << DiagKind << IsDtorCallInCtor; 4378 } 4379 4380 if (DiagKind == 1) 4381 S.NoteDeletedFunction(Decl); 4382 // FIXME: Explain inaccessibility if DiagKind == 3. 4383 } 4384 4385 return true; 4386} 4387 4388/// Check whether we should delete a special member function due to having a 4389/// direct or virtual base class or non-static data member of class type M. 4390bool SpecialMemberDeletionInfo::shouldDeleteForClassSubobject( 4391 CXXRecordDecl *Class, Subobject Subobj, unsigned Quals) { 4392 FieldDecl *Field = Subobj.dyn_cast<FieldDecl*>(); 4393 4394 // C++11 [class.ctor]p5: 4395 // -- any direct or virtual base class, or non-static data member with no 4396 // brace-or-equal-initializer, has class type M (or array thereof) and 4397 // either M has no default constructor or overload resolution as applied 4398 // to M's default constructor results in an ambiguity or in a function 4399 // that is deleted or inaccessible 4400 // C++11 [class.copy]p11, C++11 [class.copy]p23: 4401 // -- a direct or virtual base class B that cannot be copied/moved because 4402 // overload resolution, as applied to B's corresponding special member, 4403 // results in an ambiguity or a function that is deleted or inaccessible 4404 // from the defaulted special member 4405 // C++11 [class.dtor]p5: 4406 // -- any direct or virtual base class [...] has a type with a destructor 4407 // that is deleted or inaccessible 4408 if (!(CSM == Sema::CXXDefaultConstructor && 4409 Field && Field->hasInClassInitializer()) && 4410 shouldDeleteForSubobjectCall(Subobj, lookupIn(Class, Quals), false)) 4411 return true; 4412 4413 // C++11 [class.ctor]p5, C++11 [class.copy]p11: 4414 // -- any direct or virtual base class or non-static data member has a 4415 // type with a destructor that is deleted or inaccessible 4416 if (IsConstructor) { 4417 Sema::SpecialMemberOverloadResult *SMOR = 4418 S.LookupSpecialMember(Class, Sema::CXXDestructor, 4419 false, false, false, false, false); 4420 if (shouldDeleteForSubobjectCall(Subobj, SMOR, true)) 4421 return true; 4422 } 4423 4424 return false; 4425} 4426 4427/// Check whether we should delete a special member function due to the class 4428/// having a particular direct or virtual base class. 4429bool SpecialMemberDeletionInfo::shouldDeleteForBase(CXXBaseSpecifier *Base) { 4430 CXXRecordDecl *BaseClass = Base->getType()->getAsCXXRecordDecl(); 4431 return shouldDeleteForClassSubobject(BaseClass, Base, 0); 4432} 4433 4434/// Check whether we should delete a special member function due to the class 4435/// having a particular non-static data member. 4436bool SpecialMemberDeletionInfo::shouldDeleteForField(FieldDecl *FD) { 4437 QualType FieldType = S.Context.getBaseElementType(FD->getType()); 4438 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4439 4440 if (CSM == Sema::CXXDefaultConstructor) { 4441 // For a default constructor, all references must be initialized in-class 4442 // and, if a union, it must have a non-const member. 4443 if (FieldType->isReferenceType() && !FD->hasInClassInitializer()) { 4444 if (Diagnose) 4445 S.Diag(FD->getLocation(), diag::note_deleted_default_ctor_uninit_field) 4446 << MD->getParent() << FD << FieldType << /*Reference*/0; 4447 return true; 4448 } 4449 // C++11 [class.ctor]p5: any non-variant non-static data member of 4450 // const-qualified type (or array thereof) with no 4451 // brace-or-equal-initializer does not have a user-provided default 4452 // constructor. 4453 if (!inUnion() && FieldType.isConstQualified() && 4454 !FD->hasInClassInitializer() && 4455 (!FieldRecord || !FieldRecord->hasUserProvidedDefaultConstructor())) { 4456 if (Diagnose) 4457 S.Diag(FD->getLocation(), diag::note_deleted_default_ctor_uninit_field) 4458 << MD->getParent() << FD << FD->getType() << /*Const*/1; 4459 return true; 4460 } 4461 4462 if (inUnion() && !FieldType.isConstQualified()) 4463 AllFieldsAreConst = false; 4464 } else if (CSM == Sema::CXXCopyConstructor) { 4465 // For a copy constructor, data members must not be of rvalue reference 4466 // type. 4467 if (FieldType->isRValueReferenceType()) { 4468 if (Diagnose) 4469 S.Diag(FD->getLocation(), diag::note_deleted_copy_ctor_rvalue_reference) 4470 << MD->getParent() << FD << FieldType; 4471 return true; 4472 } 4473 } else if (IsAssignment) { 4474 // For an assignment operator, data members must not be of reference type. 4475 if (FieldType->isReferenceType()) { 4476 if (Diagnose) 4477 S.Diag(FD->getLocation(), diag::note_deleted_assign_field) 4478 << IsMove << MD->getParent() << FD << FieldType << /*Reference*/0; 4479 return true; 4480 } 4481 if (!FieldRecord && FieldType.isConstQualified()) { 4482 // C++11 [class.copy]p23: 4483 // -- a non-static data member of const non-class type (or array thereof) 4484 if (Diagnose) 4485 S.Diag(FD->getLocation(), diag::note_deleted_assign_field) 4486 << IsMove << MD->getParent() << FD << FD->getType() << /*Const*/1; 4487 return true; 4488 } 4489 } 4490 4491 if (FieldRecord) { 4492 // Some additional restrictions exist on the variant members. 4493 if (!inUnion() && FieldRecord->isUnion() && 4494 FieldRecord->isAnonymousStructOrUnion()) { 4495 bool AllVariantFieldsAreConst = true; 4496 4497 // FIXME: Handle anonymous unions declared within anonymous unions. 4498 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4499 UE = FieldRecord->field_end(); 4500 UI != UE; ++UI) { 4501 QualType UnionFieldType = S.Context.getBaseElementType(UI->getType()); 4502 4503 if (!UnionFieldType.isConstQualified()) 4504 AllVariantFieldsAreConst = false; 4505 4506 CXXRecordDecl *UnionFieldRecord = UnionFieldType->getAsCXXRecordDecl(); 4507 if (UnionFieldRecord && 4508 shouldDeleteForClassSubobject(UnionFieldRecord, *UI, 4509 UnionFieldType.getCVRQualifiers())) 4510 return true; 4511 } 4512 4513 // At least one member in each anonymous union must be non-const 4514 if (CSM == Sema::CXXDefaultConstructor && AllVariantFieldsAreConst && 4515 FieldRecord->field_begin() != FieldRecord->field_end()) { 4516 if (Diagnose) 4517 S.Diag(FieldRecord->getLocation(), 4518 diag::note_deleted_default_ctor_all_const) 4519 << MD->getParent() << /*anonymous union*/1; 4520 return true; 4521 } 4522 4523 // Don't check the implicit member of the anonymous union type. 4524 // This is technically non-conformant, but sanity demands it. 4525 return false; 4526 } 4527 4528 if (shouldDeleteForClassSubobject(FieldRecord, FD, 4529 FieldType.getCVRQualifiers())) 4530 return true; 4531 } 4532 4533 return false; 4534} 4535 4536/// C++11 [class.ctor] p5: 4537/// A defaulted default constructor for a class X is defined as deleted if 4538/// X is a union and all of its variant members are of const-qualified type. 4539bool SpecialMemberDeletionInfo::shouldDeleteForAllConstMembers() { 4540 // This is a silly definition, because it gives an empty union a deleted 4541 // default constructor. Don't do that. 4542 if (CSM == Sema::CXXDefaultConstructor && inUnion() && AllFieldsAreConst && 4543 (MD->getParent()->field_begin() != MD->getParent()->field_end())) { 4544 if (Diagnose) 4545 S.Diag(MD->getParent()->getLocation(), 4546 diag::note_deleted_default_ctor_all_const) 4547 << MD->getParent() << /*not anonymous union*/0; 4548 return true; 4549 } 4550 return false; 4551} 4552 4553/// Determine whether a defaulted special member function should be defined as 4554/// deleted, as specified in C++11 [class.ctor]p5, C++11 [class.copy]p11, 4555/// C++11 [class.copy]p23, and C++11 [class.dtor]p5. 4556bool Sema::ShouldDeleteSpecialMember(CXXMethodDecl *MD, CXXSpecialMember CSM, 4557 bool Diagnose) { 4558 if (MD->isInvalidDecl()) 4559 return false; 4560 CXXRecordDecl *RD = MD->getParent(); 4561 assert(!RD->isDependentType() && "do deletion after instantiation"); 4562 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4563 return false; 4564 4565 // C++11 [expr.lambda.prim]p19: 4566 // The closure type associated with a lambda-expression has a 4567 // deleted (8.4.3) default constructor and a deleted copy 4568 // assignment operator. 4569 if (RD->isLambda() && 4570 (CSM == CXXDefaultConstructor || CSM == CXXCopyAssignment)) { 4571 if (Diagnose) 4572 Diag(RD->getLocation(), diag::note_lambda_decl); 4573 return true; 4574 } 4575 4576 // For an anonymous struct or union, the copy and assignment special members 4577 // will never be used, so skip the check. For an anonymous union declared at 4578 // namespace scope, the constructor and destructor are used. 4579 if (CSM != CXXDefaultConstructor && CSM != CXXDestructor && 4580 RD->isAnonymousStructOrUnion()) 4581 return false; 4582 4583 // C++11 [class.copy]p7, p18: 4584 // If the class definition declares a move constructor or move assignment 4585 // operator, an implicitly declared copy constructor or copy assignment 4586 // operator is defined as deleted. 4587 if (MD->isImplicit() && 4588 (CSM == CXXCopyConstructor || CSM == CXXCopyAssignment)) { 4589 CXXMethodDecl *UserDeclaredMove = 0; 4590 4591 // In Microsoft mode, a user-declared move only causes the deletion of the 4592 // corresponding copy operation, not both copy operations. 4593 if (RD->hasUserDeclaredMoveConstructor() && 4594 (!getLangOpts().MicrosoftMode || CSM == CXXCopyConstructor)) { 4595 if (!Diagnose) return true; 4596 UserDeclaredMove = RD->getMoveConstructor(); 4597 assert(UserDeclaredMove); 4598 } else if (RD->hasUserDeclaredMoveAssignment() && 4599 (!getLangOpts().MicrosoftMode || CSM == CXXCopyAssignment)) { 4600 if (!Diagnose) return true; 4601 UserDeclaredMove = RD->getMoveAssignmentOperator(); 4602 assert(UserDeclaredMove); 4603 } 4604 4605 if (UserDeclaredMove) { 4606 Diag(UserDeclaredMove->getLocation(), 4607 diag::note_deleted_copy_user_declared_move) 4608 << (CSM == CXXCopyAssignment) << RD 4609 << UserDeclaredMove->isMoveAssignmentOperator(); 4610 return true; 4611 } 4612 } 4613 4614 // Do access control from the special member function 4615 ContextRAII MethodContext(*this, MD); 4616 4617 // C++11 [class.dtor]p5: 4618 // -- for a virtual destructor, lookup of the non-array deallocation function 4619 // results in an ambiguity or in a function that is deleted or inaccessible 4620 if (CSM == CXXDestructor && MD->isVirtual()) { 4621 FunctionDecl *OperatorDelete = 0; 4622 DeclarationName Name = 4623 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 4624 if (FindDeallocationFunction(MD->getLocation(), MD->getParent(), Name, 4625 OperatorDelete, false)) { 4626 if (Diagnose) 4627 Diag(RD->getLocation(), diag::note_deleted_dtor_no_operator_delete); 4628 return true; 4629 } 4630 } 4631 4632 SpecialMemberDeletionInfo SMI(*this, MD, CSM, Diagnose); 4633 4634 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4635 BE = RD->bases_end(); BI != BE; ++BI) 4636 if (!BI->isVirtual() && 4637 SMI.shouldDeleteForBase(BI)) 4638 return true; 4639 4640 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 4641 BE = RD->vbases_end(); BI != BE; ++BI) 4642 if (SMI.shouldDeleteForBase(BI)) 4643 return true; 4644 4645 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4646 FE = RD->field_end(); FI != FE; ++FI) 4647 if (!FI->isInvalidDecl() && !FI->isUnnamedBitfield() && 4648 SMI.shouldDeleteForField(*FI)) 4649 return true; 4650 4651 if (SMI.shouldDeleteForAllConstMembers()) 4652 return true; 4653 4654 return false; 4655} 4656 4657/// \brief Data used with FindHiddenVirtualMethod 4658namespace { 4659 struct FindHiddenVirtualMethodData { 4660 Sema *S; 4661 CXXMethodDecl *Method; 4662 llvm::SmallPtrSet<const CXXMethodDecl *, 8> OverridenAndUsingBaseMethods; 4663 SmallVector<CXXMethodDecl *, 8> OverloadedMethods; 4664 }; 4665} 4666 4667/// \brief Member lookup function that determines whether a given C++ 4668/// method overloads virtual methods in a base class without overriding any, 4669/// to be used with CXXRecordDecl::lookupInBases(). 4670static bool FindHiddenVirtualMethod(const CXXBaseSpecifier *Specifier, 4671 CXXBasePath &Path, 4672 void *UserData) { 4673 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 4674 4675 FindHiddenVirtualMethodData &Data 4676 = *static_cast<FindHiddenVirtualMethodData*>(UserData); 4677 4678 DeclarationName Name = Data.Method->getDeclName(); 4679 assert(Name.getNameKind() == DeclarationName::Identifier); 4680 4681 bool foundSameNameMethod = false; 4682 SmallVector<CXXMethodDecl *, 8> overloadedMethods; 4683 for (Path.Decls = BaseRecord->lookup(Name); 4684 Path.Decls.first != Path.Decls.second; 4685 ++Path.Decls.first) { 4686 NamedDecl *D = *Path.Decls.first; 4687 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 4688 MD = MD->getCanonicalDecl(); 4689 foundSameNameMethod = true; 4690 // Interested only in hidden virtual methods. 4691 if (!MD->isVirtual()) 4692 continue; 4693 // If the method we are checking overrides a method from its base 4694 // don't warn about the other overloaded methods. 4695 if (!Data.S->IsOverload(Data.Method, MD, false)) 4696 return true; 4697 // Collect the overload only if its hidden. 4698 if (!Data.OverridenAndUsingBaseMethods.count(MD)) 4699 overloadedMethods.push_back(MD); 4700 } 4701 } 4702 4703 if (foundSameNameMethod) 4704 Data.OverloadedMethods.append(overloadedMethods.begin(), 4705 overloadedMethods.end()); 4706 return foundSameNameMethod; 4707} 4708 4709/// \brief See if a method overloads virtual methods in a base class without 4710/// overriding any. 4711void Sema::DiagnoseHiddenVirtualMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 4712 if (Diags.getDiagnosticLevel(diag::warn_overloaded_virtual, 4713 MD->getLocation()) == DiagnosticsEngine::Ignored) 4714 return; 4715 if (!MD->getDeclName().isIdentifier()) 4716 return; 4717 4718 CXXBasePaths Paths(/*FindAmbiguities=*/true, // true to look in all bases. 4719 /*bool RecordPaths=*/false, 4720 /*bool DetectVirtual=*/false); 4721 FindHiddenVirtualMethodData Data; 4722 Data.Method = MD; 4723 Data.S = this; 4724 4725 // Keep the base methods that were overriden or introduced in the subclass 4726 // by 'using' in a set. A base method not in this set is hidden. 4727 for (DeclContext::lookup_result res = DC->lookup(MD->getDeclName()); 4728 res.first != res.second; ++res.first) { 4729 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*res.first)) 4730 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 4731 E = MD->end_overridden_methods(); 4732 I != E; ++I) 4733 Data.OverridenAndUsingBaseMethods.insert((*I)->getCanonicalDecl()); 4734 if (UsingShadowDecl *shad = dyn_cast<UsingShadowDecl>(*res.first)) 4735 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(shad->getTargetDecl())) 4736 Data.OverridenAndUsingBaseMethods.insert(MD->getCanonicalDecl()); 4737 } 4738 4739 if (DC->lookupInBases(&FindHiddenVirtualMethod, &Data, Paths) && 4740 !Data.OverloadedMethods.empty()) { 4741 Diag(MD->getLocation(), diag::warn_overloaded_virtual) 4742 << MD << (Data.OverloadedMethods.size() > 1); 4743 4744 for (unsigned i = 0, e = Data.OverloadedMethods.size(); i != e; ++i) { 4745 CXXMethodDecl *overloadedMD = Data.OverloadedMethods[i]; 4746 Diag(overloadedMD->getLocation(), 4747 diag::note_hidden_overloaded_virtual_declared_here) << overloadedMD; 4748 } 4749 } 4750} 4751 4752void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 4753 Decl *TagDecl, 4754 SourceLocation LBrac, 4755 SourceLocation RBrac, 4756 AttributeList *AttrList) { 4757 if (!TagDecl) 4758 return; 4759 4760 AdjustDeclIfTemplate(TagDecl); 4761 4762 for (const AttributeList* l = AttrList; l; l = l->getNext()) { 4763 if (l->getKind() != AttributeList::AT_Visibility) 4764 continue; 4765 l->setInvalid(); 4766 Diag(l->getLoc(), diag::warn_attribute_after_definition_ignored) << 4767 l->getName(); 4768 } 4769 4770 ActOnFields(S, RLoc, TagDecl, llvm::makeArrayRef( 4771 // strict aliasing violation! 4772 reinterpret_cast<Decl**>(FieldCollector->getCurFields()), 4773 FieldCollector->getCurNumFields()), LBrac, RBrac, AttrList); 4774 4775 CheckCompletedCXXClass( 4776 dyn_cast_or_null<CXXRecordDecl>(TagDecl)); 4777} 4778 4779/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 4780/// special functions, such as the default constructor, copy 4781/// constructor, or destructor, to the given C++ class (C++ 4782/// [special]p1). This routine can only be executed just before the 4783/// definition of the class is complete. 4784void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 4785 if (!ClassDecl->hasUserDeclaredConstructor()) 4786 ++ASTContext::NumImplicitDefaultConstructors; 4787 4788 if (!ClassDecl->hasUserDeclaredCopyConstructor()) 4789 ++ASTContext::NumImplicitCopyConstructors; 4790 4791 if (getLangOpts().CPlusPlus0x && ClassDecl->needsImplicitMoveConstructor()) 4792 ++ASTContext::NumImplicitMoveConstructors; 4793 4794 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 4795 ++ASTContext::NumImplicitCopyAssignmentOperators; 4796 4797 // If we have a dynamic class, then the copy assignment operator may be 4798 // virtual, so we have to declare it immediately. This ensures that, e.g., 4799 // it shows up in the right place in the vtable and that we diagnose 4800 // problems with the implicit exception specification. 4801 if (ClassDecl->isDynamicClass()) 4802 DeclareImplicitCopyAssignment(ClassDecl); 4803 } 4804 4805 if (getLangOpts().CPlusPlus0x && ClassDecl->needsImplicitMoveAssignment()) { 4806 ++ASTContext::NumImplicitMoveAssignmentOperators; 4807 4808 // Likewise for the move assignment operator. 4809 if (ClassDecl->isDynamicClass()) 4810 DeclareImplicitMoveAssignment(ClassDecl); 4811 } 4812 4813 if (!ClassDecl->hasUserDeclaredDestructor()) { 4814 ++ASTContext::NumImplicitDestructors; 4815 4816 // If we have a dynamic class, then the destructor may be virtual, so we 4817 // have to declare the destructor immediately. This ensures that, e.g., it 4818 // shows up in the right place in the vtable and that we diagnose problems 4819 // with the implicit exception specification. 4820 if (ClassDecl->isDynamicClass()) 4821 DeclareImplicitDestructor(ClassDecl); 4822 } 4823} 4824 4825void Sema::ActOnReenterDeclaratorTemplateScope(Scope *S, DeclaratorDecl *D) { 4826 if (!D) 4827 return; 4828 4829 int NumParamList = D->getNumTemplateParameterLists(); 4830 for (int i = 0; i < NumParamList; i++) { 4831 TemplateParameterList* Params = D->getTemplateParameterList(i); 4832 for (TemplateParameterList::iterator Param = Params->begin(), 4833 ParamEnd = Params->end(); 4834 Param != ParamEnd; ++Param) { 4835 NamedDecl *Named = cast<NamedDecl>(*Param); 4836 if (Named->getDeclName()) { 4837 S->AddDecl(Named); 4838 IdResolver.AddDecl(Named); 4839 } 4840 } 4841 } 4842} 4843 4844void Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) { 4845 if (!D) 4846 return; 4847 4848 TemplateParameterList *Params = 0; 4849 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 4850 Params = Template->getTemplateParameters(); 4851 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 4852 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 4853 Params = PartialSpec->getTemplateParameters(); 4854 else 4855 return; 4856 4857 for (TemplateParameterList::iterator Param = Params->begin(), 4858 ParamEnd = Params->end(); 4859 Param != ParamEnd; ++Param) { 4860 NamedDecl *Named = cast<NamedDecl>(*Param); 4861 if (Named->getDeclName()) { 4862 S->AddDecl(Named); 4863 IdResolver.AddDecl(Named); 4864 } 4865 } 4866} 4867 4868void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 4869 if (!RecordD) return; 4870 AdjustDeclIfTemplate(RecordD); 4871 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD); 4872 PushDeclContext(S, Record); 4873} 4874 4875void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 4876 if (!RecordD) return; 4877 PopDeclContext(); 4878} 4879 4880/// ActOnStartDelayedCXXMethodDeclaration - We have completed 4881/// parsing a top-level (non-nested) C++ class, and we are now 4882/// parsing those parts of the given Method declaration that could 4883/// not be parsed earlier (C++ [class.mem]p2), such as default 4884/// arguments. This action should enter the scope of the given 4885/// Method declaration as if we had just parsed the qualified method 4886/// name. However, it should not bring the parameters into scope; 4887/// that will be performed by ActOnDelayedCXXMethodParameter. 4888void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 4889} 4890 4891/// ActOnDelayedCXXMethodParameter - We've already started a delayed 4892/// C++ method declaration. We're (re-)introducing the given 4893/// function parameter into scope for use in parsing later parts of 4894/// the method declaration. For example, we could see an 4895/// ActOnParamDefaultArgument event for this parameter. 4896void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) { 4897 if (!ParamD) 4898 return; 4899 4900 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD); 4901 4902 // If this parameter has an unparsed default argument, clear it out 4903 // to make way for the parsed default argument. 4904 if (Param->hasUnparsedDefaultArg()) 4905 Param->setDefaultArg(0); 4906 4907 S->AddDecl(Param); 4908 if (Param->getDeclName()) 4909 IdResolver.AddDecl(Param); 4910} 4911 4912/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 4913/// processing the delayed method declaration for Method. The method 4914/// declaration is now considered finished. There may be a separate 4915/// ActOnStartOfFunctionDef action later (not necessarily 4916/// immediately!) for this method, if it was also defined inside the 4917/// class body. 4918void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 4919 if (!MethodD) 4920 return; 4921 4922 AdjustDeclIfTemplate(MethodD); 4923 4924 FunctionDecl *Method = cast<FunctionDecl>(MethodD); 4925 4926 // Now that we have our default arguments, check the constructor 4927 // again. It could produce additional diagnostics or affect whether 4928 // the class has implicitly-declared destructors, among other 4929 // things. 4930 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 4931 CheckConstructor(Constructor); 4932 4933 // Check the default arguments, which we may have added. 4934 if (!Method->isInvalidDecl()) 4935 CheckCXXDefaultArguments(Method); 4936} 4937 4938/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 4939/// the well-formedness of the constructor declarator @p D with type @p 4940/// R. If there are any errors in the declarator, this routine will 4941/// emit diagnostics and set the invalid bit to true. In any case, the type 4942/// will be updated to reflect a well-formed type for the constructor and 4943/// returned. 4944QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 4945 StorageClass &SC) { 4946 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 4947 4948 // C++ [class.ctor]p3: 4949 // A constructor shall not be virtual (10.3) or static (9.4). A 4950 // constructor can be invoked for a const, volatile or const 4951 // volatile object. A constructor shall not be declared const, 4952 // volatile, or const volatile (9.3.2). 4953 if (isVirtual) { 4954 if (!D.isInvalidType()) 4955 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 4956 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 4957 << SourceRange(D.getIdentifierLoc()); 4958 D.setInvalidType(); 4959 } 4960 if (SC == SC_Static) { 4961 if (!D.isInvalidType()) 4962 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 4963 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 4964 << SourceRange(D.getIdentifierLoc()); 4965 D.setInvalidType(); 4966 SC = SC_None; 4967 } 4968 4969 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 4970 if (FTI.TypeQuals != 0) { 4971 if (FTI.TypeQuals & Qualifiers::Const) 4972 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 4973 << "const" << SourceRange(D.getIdentifierLoc()); 4974 if (FTI.TypeQuals & Qualifiers::Volatile) 4975 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 4976 << "volatile" << SourceRange(D.getIdentifierLoc()); 4977 if (FTI.TypeQuals & Qualifiers::Restrict) 4978 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 4979 << "restrict" << SourceRange(D.getIdentifierLoc()); 4980 D.setInvalidType(); 4981 } 4982 4983 // C++0x [class.ctor]p4: 4984 // A constructor shall not be declared with a ref-qualifier. 4985 if (FTI.hasRefQualifier()) { 4986 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_constructor) 4987 << FTI.RefQualifierIsLValueRef 4988 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 4989 D.setInvalidType(); 4990 } 4991 4992 // Rebuild the function type "R" without any type qualifiers (in 4993 // case any of the errors above fired) and with "void" as the 4994 // return type, since constructors don't have return types. 4995 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 4996 if (Proto->getResultType() == Context.VoidTy && !D.isInvalidType()) 4997 return R; 4998 4999 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 5000 EPI.TypeQuals = 0; 5001 EPI.RefQualifier = RQ_None; 5002 5003 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 5004 Proto->getNumArgs(), EPI); 5005} 5006 5007/// CheckConstructor - Checks a fully-formed constructor for 5008/// well-formedness, issuing any diagnostics required. Returns true if 5009/// the constructor declarator is invalid. 5010void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 5011 CXXRecordDecl *ClassDecl 5012 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 5013 if (!ClassDecl) 5014 return Constructor->setInvalidDecl(); 5015 5016 // C++ [class.copy]p3: 5017 // A declaration of a constructor for a class X is ill-formed if 5018 // its first parameter is of type (optionally cv-qualified) X and 5019 // either there are no other parameters or else all other 5020 // parameters have default arguments. 5021 if (!Constructor->isInvalidDecl() && 5022 ((Constructor->getNumParams() == 1) || 5023 (Constructor->getNumParams() > 1 && 5024 Constructor->getParamDecl(1)->hasDefaultArg())) && 5025 Constructor->getTemplateSpecializationKind() 5026 != TSK_ImplicitInstantiation) { 5027 QualType ParamType = Constructor->getParamDecl(0)->getType(); 5028 QualType ClassTy = Context.getTagDeclType(ClassDecl); 5029 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 5030 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 5031 const char *ConstRef 5032 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 5033 : " const &"; 5034 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 5035 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 5036 5037 // FIXME: Rather that making the constructor invalid, we should endeavor 5038 // to fix the type. 5039 Constructor->setInvalidDecl(); 5040 } 5041 } 5042} 5043 5044/// CheckDestructor - Checks a fully-formed destructor definition for 5045/// well-formedness, issuing any diagnostics required. Returns true 5046/// on error. 5047bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 5048 CXXRecordDecl *RD = Destructor->getParent(); 5049 5050 if (Destructor->isVirtual()) { 5051 SourceLocation Loc; 5052 5053 if (!Destructor->isImplicit()) 5054 Loc = Destructor->getLocation(); 5055 else 5056 Loc = RD->getLocation(); 5057 5058 // If we have a virtual destructor, look up the deallocation function 5059 FunctionDecl *OperatorDelete = 0; 5060 DeclarationName Name = 5061 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 5062 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 5063 return true; 5064 5065 MarkFunctionReferenced(Loc, OperatorDelete); 5066 5067 Destructor->setOperatorDelete(OperatorDelete); 5068 } 5069 5070 return false; 5071} 5072 5073static inline bool 5074FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 5075 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 5076 FTI.ArgInfo[0].Param && 5077 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()); 5078} 5079 5080/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 5081/// the well-formednes of the destructor declarator @p D with type @p 5082/// R. If there are any errors in the declarator, this routine will 5083/// emit diagnostics and set the declarator to invalid. Even if this happens, 5084/// will be updated to reflect a well-formed type for the destructor and 5085/// returned. 5086QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, 5087 StorageClass& SC) { 5088 // C++ [class.dtor]p1: 5089 // [...] A typedef-name that names a class is a class-name 5090 // (7.1.3); however, a typedef-name that names a class shall not 5091 // be used as the identifier in the declarator for a destructor 5092 // declaration. 5093 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 5094 if (const TypedefType *TT = DeclaratorType->getAs<TypedefType>()) 5095 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 5096 << DeclaratorType << isa<TypeAliasDecl>(TT->getDecl()); 5097 else if (const TemplateSpecializationType *TST = 5098 DeclaratorType->getAs<TemplateSpecializationType>()) 5099 if (TST->isTypeAlias()) 5100 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 5101 << DeclaratorType << 1; 5102 5103 // C++ [class.dtor]p2: 5104 // A destructor is used to destroy objects of its class type. A 5105 // destructor takes no parameters, and no return type can be 5106 // specified for it (not even void). The address of a destructor 5107 // shall not be taken. A destructor shall not be static. A 5108 // destructor can be invoked for a const, volatile or const 5109 // volatile object. A destructor shall not be declared const, 5110 // volatile or const volatile (9.3.2). 5111 if (SC == SC_Static) { 5112 if (!D.isInvalidType()) 5113 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 5114 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5115 << SourceRange(D.getIdentifierLoc()) 5116 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 5117 5118 SC = SC_None; 5119 } 5120 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 5121 // Destructors don't have return types, but the parser will 5122 // happily parse something like: 5123 // 5124 // class X { 5125 // float ~X(); 5126 // }; 5127 // 5128 // The return type will be eliminated later. 5129 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 5130 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 5131 << SourceRange(D.getIdentifierLoc()); 5132 } 5133 5134 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5135 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 5136 if (FTI.TypeQuals & Qualifiers::Const) 5137 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5138 << "const" << SourceRange(D.getIdentifierLoc()); 5139 if (FTI.TypeQuals & Qualifiers::Volatile) 5140 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5141 << "volatile" << SourceRange(D.getIdentifierLoc()); 5142 if (FTI.TypeQuals & Qualifiers::Restrict) 5143 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5144 << "restrict" << SourceRange(D.getIdentifierLoc()); 5145 D.setInvalidType(); 5146 } 5147 5148 // C++0x [class.dtor]p2: 5149 // A destructor shall not be declared with a ref-qualifier. 5150 if (FTI.hasRefQualifier()) { 5151 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_destructor) 5152 << FTI.RefQualifierIsLValueRef 5153 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 5154 D.setInvalidType(); 5155 } 5156 5157 // Make sure we don't have any parameters. 5158 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 5159 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 5160 5161 // Delete the parameters. 5162 FTI.freeArgs(); 5163 D.setInvalidType(); 5164 } 5165 5166 // Make sure the destructor isn't variadic. 5167 if (FTI.isVariadic) { 5168 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 5169 D.setInvalidType(); 5170 } 5171 5172 // Rebuild the function type "R" without any type qualifiers or 5173 // parameters (in case any of the errors above fired) and with 5174 // "void" as the return type, since destructors don't have return 5175 // types. 5176 if (!D.isInvalidType()) 5177 return R; 5178 5179 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5180 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 5181 EPI.Variadic = false; 5182 EPI.TypeQuals = 0; 5183 EPI.RefQualifier = RQ_None; 5184 return Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 5185} 5186 5187/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 5188/// well-formednes of the conversion function declarator @p D with 5189/// type @p R. If there are any errors in the declarator, this routine 5190/// will emit diagnostics and return true. Otherwise, it will return 5191/// false. Either way, the type @p R will be updated to reflect a 5192/// well-formed type for the conversion operator. 5193void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 5194 StorageClass& SC) { 5195 // C++ [class.conv.fct]p1: 5196 // Neither parameter types nor return type can be specified. The 5197 // type of a conversion function (8.3.5) is "function taking no 5198 // parameter returning conversion-type-id." 5199 if (SC == SC_Static) { 5200 if (!D.isInvalidType()) 5201 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 5202 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5203 << SourceRange(D.getIdentifierLoc()); 5204 D.setInvalidType(); 5205 SC = SC_None; 5206 } 5207 5208 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 5209 5210 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 5211 // Conversion functions don't have return types, but the parser will 5212 // happily parse something like: 5213 // 5214 // class X { 5215 // float operator bool(); 5216 // }; 5217 // 5218 // The return type will be changed later anyway. 5219 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 5220 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 5221 << SourceRange(D.getIdentifierLoc()); 5222 D.setInvalidType(); 5223 } 5224 5225 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5226 5227 // Make sure we don't have any parameters. 5228 if (Proto->getNumArgs() > 0) { 5229 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 5230 5231 // Delete the parameters. 5232 D.getFunctionTypeInfo().freeArgs(); 5233 D.setInvalidType(); 5234 } else if (Proto->isVariadic()) { 5235 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 5236 D.setInvalidType(); 5237 } 5238 5239 // Diagnose "&operator bool()" and other such nonsense. This 5240 // is actually a gcc extension which we don't support. 5241 if (Proto->getResultType() != ConvType) { 5242 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 5243 << Proto->getResultType(); 5244 D.setInvalidType(); 5245 ConvType = Proto->getResultType(); 5246 } 5247 5248 // C++ [class.conv.fct]p4: 5249 // The conversion-type-id shall not represent a function type nor 5250 // an array type. 5251 if (ConvType->isArrayType()) { 5252 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 5253 ConvType = Context.getPointerType(ConvType); 5254 D.setInvalidType(); 5255 } else if (ConvType->isFunctionType()) { 5256 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 5257 ConvType = Context.getPointerType(ConvType); 5258 D.setInvalidType(); 5259 } 5260 5261 // Rebuild the function type "R" without any parameters (in case any 5262 // of the errors above fired) and with the conversion type as the 5263 // return type. 5264 if (D.isInvalidType()) 5265 R = Context.getFunctionType(ConvType, 0, 0, Proto->getExtProtoInfo()); 5266 5267 // C++0x explicit conversion operators. 5268 if (D.getDeclSpec().isExplicitSpecified()) 5269 Diag(D.getDeclSpec().getExplicitSpecLoc(), 5270 getLangOpts().CPlusPlus0x ? 5271 diag::warn_cxx98_compat_explicit_conversion_functions : 5272 diag::ext_explicit_conversion_functions) 5273 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 5274} 5275 5276/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 5277/// the declaration of the given C++ conversion function. This routine 5278/// is responsible for recording the conversion function in the C++ 5279/// class, if possible. 5280Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 5281 assert(Conversion && "Expected to receive a conversion function declaration"); 5282 5283 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 5284 5285 // Make sure we aren't redeclaring the conversion function. 5286 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 5287 5288 // C++ [class.conv.fct]p1: 5289 // [...] A conversion function is never used to convert a 5290 // (possibly cv-qualified) object to the (possibly cv-qualified) 5291 // same object type (or a reference to it), to a (possibly 5292 // cv-qualified) base class of that type (or a reference to it), 5293 // or to (possibly cv-qualified) void. 5294 // FIXME: Suppress this warning if the conversion function ends up being a 5295 // virtual function that overrides a virtual function in a base class. 5296 QualType ClassType 5297 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 5298 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 5299 ConvType = ConvTypeRef->getPointeeType(); 5300 if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared && 5301 Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) 5302 /* Suppress diagnostics for instantiations. */; 5303 else if (ConvType->isRecordType()) { 5304 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 5305 if (ConvType == ClassType) 5306 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 5307 << ClassType; 5308 else if (IsDerivedFrom(ClassType, ConvType)) 5309 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 5310 << ClassType << ConvType; 5311 } else if (ConvType->isVoidType()) { 5312 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 5313 << ClassType << ConvType; 5314 } 5315 5316 if (FunctionTemplateDecl *ConversionTemplate 5317 = Conversion->getDescribedFunctionTemplate()) 5318 return ConversionTemplate; 5319 5320 return Conversion; 5321} 5322 5323//===----------------------------------------------------------------------===// 5324// Namespace Handling 5325//===----------------------------------------------------------------------===// 5326 5327 5328 5329/// ActOnStartNamespaceDef - This is called at the start of a namespace 5330/// definition. 5331Decl *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 5332 SourceLocation InlineLoc, 5333 SourceLocation NamespaceLoc, 5334 SourceLocation IdentLoc, 5335 IdentifierInfo *II, 5336 SourceLocation LBrace, 5337 AttributeList *AttrList) { 5338 SourceLocation StartLoc = InlineLoc.isValid() ? InlineLoc : NamespaceLoc; 5339 // For anonymous namespace, take the location of the left brace. 5340 SourceLocation Loc = II ? IdentLoc : LBrace; 5341 bool IsInline = InlineLoc.isValid(); 5342 bool IsInvalid = false; 5343 bool IsStd = false; 5344 bool AddToKnown = false; 5345 Scope *DeclRegionScope = NamespcScope->getParent(); 5346 5347 NamespaceDecl *PrevNS = 0; 5348 if (II) { 5349 // C++ [namespace.def]p2: 5350 // The identifier in an original-namespace-definition shall not 5351 // have been previously defined in the declarative region in 5352 // which the original-namespace-definition appears. The 5353 // identifier in an original-namespace-definition is the name of 5354 // the namespace. Subsequently in that declarative region, it is 5355 // treated as an original-namespace-name. 5356 // 5357 // Since namespace names are unique in their scope, and we don't 5358 // look through using directives, just look for any ordinary names. 5359 5360 const unsigned IDNS = Decl::IDNS_Ordinary | Decl::IDNS_Member | 5361 Decl::IDNS_Type | Decl::IDNS_Using | Decl::IDNS_Tag | 5362 Decl::IDNS_Namespace; 5363 NamedDecl *PrevDecl = 0; 5364 for (DeclContext::lookup_result R 5365 = CurContext->getRedeclContext()->lookup(II); 5366 R.first != R.second; ++R.first) { 5367 if ((*R.first)->getIdentifierNamespace() & IDNS) { 5368 PrevDecl = *R.first; 5369 break; 5370 } 5371 } 5372 5373 PrevNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl); 5374 5375 if (PrevNS) { 5376 // This is an extended namespace definition. 5377 if (IsInline != PrevNS->isInline()) { 5378 // inline-ness must match 5379 if (PrevNS->isInline()) { 5380 // The user probably just forgot the 'inline', so suggest that it 5381 // be added back. 5382 Diag(Loc, diag::warn_inline_namespace_reopened_noninline) 5383 << FixItHint::CreateInsertion(NamespaceLoc, "inline "); 5384 } else { 5385 Diag(Loc, diag::err_inline_namespace_mismatch) 5386 << IsInline; 5387 } 5388 Diag(PrevNS->getLocation(), diag::note_previous_definition); 5389 5390 IsInline = PrevNS->isInline(); 5391 } 5392 } else if (PrevDecl) { 5393 // This is an invalid name redefinition. 5394 Diag(Loc, diag::err_redefinition_different_kind) 5395 << II; 5396 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 5397 IsInvalid = true; 5398 // Continue on to push Namespc as current DeclContext and return it. 5399 } else if (II->isStr("std") && 5400 CurContext->getRedeclContext()->isTranslationUnit()) { 5401 // This is the first "real" definition of the namespace "std", so update 5402 // our cache of the "std" namespace to point at this definition. 5403 PrevNS = getStdNamespace(); 5404 IsStd = true; 5405 AddToKnown = !IsInline; 5406 } else { 5407 // We've seen this namespace for the first time. 5408 AddToKnown = !IsInline; 5409 } 5410 } else { 5411 // Anonymous namespaces. 5412 5413 // Determine whether the parent already has an anonymous namespace. 5414 DeclContext *Parent = CurContext->getRedeclContext(); 5415 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 5416 PrevNS = TU->getAnonymousNamespace(); 5417 } else { 5418 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 5419 PrevNS = ND->getAnonymousNamespace(); 5420 } 5421 5422 if (PrevNS && IsInline != PrevNS->isInline()) { 5423 // inline-ness must match 5424 Diag(Loc, diag::err_inline_namespace_mismatch) 5425 << IsInline; 5426 Diag(PrevNS->getLocation(), diag::note_previous_definition); 5427 5428 // Recover by ignoring the new namespace's inline status. 5429 IsInline = PrevNS->isInline(); 5430 } 5431 } 5432 5433 NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, IsInline, 5434 StartLoc, Loc, II, PrevNS); 5435 if (IsInvalid) 5436 Namespc->setInvalidDecl(); 5437 5438 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 5439 5440 // FIXME: Should we be merging attributes? 5441 if (const VisibilityAttr *Attr = Namespc->getAttr<VisibilityAttr>()) 5442 PushNamespaceVisibilityAttr(Attr, Loc); 5443 5444 if (IsStd) 5445 StdNamespace = Namespc; 5446 if (AddToKnown) 5447 KnownNamespaces[Namespc] = false; 5448 5449 if (II) { 5450 PushOnScopeChains(Namespc, DeclRegionScope); 5451 } else { 5452 // Link the anonymous namespace into its parent. 5453 DeclContext *Parent = CurContext->getRedeclContext(); 5454 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 5455 TU->setAnonymousNamespace(Namespc); 5456 } else { 5457 cast<NamespaceDecl>(Parent)->setAnonymousNamespace(Namespc); 5458 } 5459 5460 CurContext->addDecl(Namespc); 5461 5462 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 5463 // behaves as if it were replaced by 5464 // namespace unique { /* empty body */ } 5465 // using namespace unique; 5466 // namespace unique { namespace-body } 5467 // where all occurrences of 'unique' in a translation unit are 5468 // replaced by the same identifier and this identifier differs 5469 // from all other identifiers in the entire program. 5470 5471 // We just create the namespace with an empty name and then add an 5472 // implicit using declaration, just like the standard suggests. 5473 // 5474 // CodeGen enforces the "universally unique" aspect by giving all 5475 // declarations semantically contained within an anonymous 5476 // namespace internal linkage. 5477 5478 if (!PrevNS) { 5479 UsingDirectiveDecl* UD 5480 = UsingDirectiveDecl::Create(Context, CurContext, 5481 /* 'using' */ LBrace, 5482 /* 'namespace' */ SourceLocation(), 5483 /* qualifier */ NestedNameSpecifierLoc(), 5484 /* identifier */ SourceLocation(), 5485 Namespc, 5486 /* Ancestor */ CurContext); 5487 UD->setImplicit(); 5488 CurContext->addDecl(UD); 5489 } 5490 } 5491 5492 ActOnDocumentableDecl(Namespc); 5493 5494 // Although we could have an invalid decl (i.e. the namespace name is a 5495 // redefinition), push it as current DeclContext and try to continue parsing. 5496 // FIXME: We should be able to push Namespc here, so that the each DeclContext 5497 // for the namespace has the declarations that showed up in that particular 5498 // namespace definition. 5499 PushDeclContext(NamespcScope, Namespc); 5500 return Namespc; 5501} 5502 5503/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 5504/// is a namespace alias, returns the namespace it points to. 5505static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 5506 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 5507 return AD->getNamespace(); 5508 return dyn_cast_or_null<NamespaceDecl>(D); 5509} 5510 5511/// ActOnFinishNamespaceDef - This callback is called after a namespace is 5512/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 5513void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) { 5514 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 5515 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 5516 Namespc->setRBraceLoc(RBrace); 5517 PopDeclContext(); 5518 if (Namespc->hasAttr<VisibilityAttr>()) 5519 PopPragmaVisibility(true, RBrace); 5520} 5521 5522CXXRecordDecl *Sema::getStdBadAlloc() const { 5523 return cast_or_null<CXXRecordDecl>( 5524 StdBadAlloc.get(Context.getExternalSource())); 5525} 5526 5527NamespaceDecl *Sema::getStdNamespace() const { 5528 return cast_or_null<NamespaceDecl>( 5529 StdNamespace.get(Context.getExternalSource())); 5530} 5531 5532/// \brief Retrieve the special "std" namespace, which may require us to 5533/// implicitly define the namespace. 5534NamespaceDecl *Sema::getOrCreateStdNamespace() { 5535 if (!StdNamespace) { 5536 // The "std" namespace has not yet been defined, so build one implicitly. 5537 StdNamespace = NamespaceDecl::Create(Context, 5538 Context.getTranslationUnitDecl(), 5539 /*Inline=*/false, 5540 SourceLocation(), SourceLocation(), 5541 &PP.getIdentifierTable().get("std"), 5542 /*PrevDecl=*/0); 5543 getStdNamespace()->setImplicit(true); 5544 } 5545 5546 return getStdNamespace(); 5547} 5548 5549bool Sema::isStdInitializerList(QualType Ty, QualType *Element) { 5550 assert(getLangOpts().CPlusPlus && 5551 "Looking for std::initializer_list outside of C++."); 5552 5553 // We're looking for implicit instantiations of 5554 // template <typename E> class std::initializer_list. 5555 5556 if (!StdNamespace) // If we haven't seen namespace std yet, this can't be it. 5557 return false; 5558 5559 ClassTemplateDecl *Template = 0; 5560 const TemplateArgument *Arguments = 0; 5561 5562 if (const RecordType *RT = Ty->getAs<RecordType>()) { 5563 5564 ClassTemplateSpecializationDecl *Specialization = 5565 dyn_cast<ClassTemplateSpecializationDecl>(RT->getDecl()); 5566 if (!Specialization) 5567 return false; 5568 5569 Template = Specialization->getSpecializedTemplate(); 5570 Arguments = Specialization->getTemplateArgs().data(); 5571 } else if (const TemplateSpecializationType *TST = 5572 Ty->getAs<TemplateSpecializationType>()) { 5573 Template = dyn_cast_or_null<ClassTemplateDecl>( 5574 TST->getTemplateName().getAsTemplateDecl()); 5575 Arguments = TST->getArgs(); 5576 } 5577 if (!Template) 5578 return false; 5579 5580 if (!StdInitializerList) { 5581 // Haven't recognized std::initializer_list yet, maybe this is it. 5582 CXXRecordDecl *TemplateClass = Template->getTemplatedDecl(); 5583 if (TemplateClass->getIdentifier() != 5584 &PP.getIdentifierTable().get("initializer_list") || 5585 !getStdNamespace()->InEnclosingNamespaceSetOf( 5586 TemplateClass->getDeclContext())) 5587 return false; 5588 // This is a template called std::initializer_list, but is it the right 5589 // template? 5590 TemplateParameterList *Params = Template->getTemplateParameters(); 5591 if (Params->getMinRequiredArguments() != 1) 5592 return false; 5593 if (!isa<TemplateTypeParmDecl>(Params->getParam(0))) 5594 return false; 5595 5596 // It's the right template. 5597 StdInitializerList = Template; 5598 } 5599 5600 if (Template != StdInitializerList) 5601 return false; 5602 5603 // This is an instance of std::initializer_list. Find the argument type. 5604 if (Element) 5605 *Element = Arguments[0].getAsType(); 5606 return true; 5607} 5608 5609static ClassTemplateDecl *LookupStdInitializerList(Sema &S, SourceLocation Loc){ 5610 NamespaceDecl *Std = S.getStdNamespace(); 5611 if (!Std) { 5612 S.Diag(Loc, diag::err_implied_std_initializer_list_not_found); 5613 return 0; 5614 } 5615 5616 LookupResult Result(S, &S.PP.getIdentifierTable().get("initializer_list"), 5617 Loc, Sema::LookupOrdinaryName); 5618 if (!S.LookupQualifiedName(Result, Std)) { 5619 S.Diag(Loc, diag::err_implied_std_initializer_list_not_found); 5620 return 0; 5621 } 5622 ClassTemplateDecl *Template = Result.getAsSingle<ClassTemplateDecl>(); 5623 if (!Template) { 5624 Result.suppressDiagnostics(); 5625 // We found something weird. Complain about the first thing we found. 5626 NamedDecl *Found = *Result.begin(); 5627 S.Diag(Found->getLocation(), diag::err_malformed_std_initializer_list); 5628 return 0; 5629 } 5630 5631 // We found some template called std::initializer_list. Now verify that it's 5632 // correct. 5633 TemplateParameterList *Params = Template->getTemplateParameters(); 5634 if (Params->getMinRequiredArguments() != 1 || 5635 !isa<TemplateTypeParmDecl>(Params->getParam(0))) { 5636 S.Diag(Template->getLocation(), diag::err_malformed_std_initializer_list); 5637 return 0; 5638 } 5639 5640 return Template; 5641} 5642 5643QualType Sema::BuildStdInitializerList(QualType Element, SourceLocation Loc) { 5644 if (!StdInitializerList) { 5645 StdInitializerList = LookupStdInitializerList(*this, Loc); 5646 if (!StdInitializerList) 5647 return QualType(); 5648 } 5649 5650 TemplateArgumentListInfo Args(Loc, Loc); 5651 Args.addArgument(TemplateArgumentLoc(TemplateArgument(Element), 5652 Context.getTrivialTypeSourceInfo(Element, 5653 Loc))); 5654 return Context.getCanonicalType( 5655 CheckTemplateIdType(TemplateName(StdInitializerList), Loc, Args)); 5656} 5657 5658bool Sema::isInitListConstructor(const CXXConstructorDecl* Ctor) { 5659 // C++ [dcl.init.list]p2: 5660 // A constructor is an initializer-list constructor if its first parameter 5661 // is of type std::initializer_list<E> or reference to possibly cv-qualified 5662 // std::initializer_list<E> for some type E, and either there are no other 5663 // parameters or else all other parameters have default arguments. 5664 if (Ctor->getNumParams() < 1 || 5665 (Ctor->getNumParams() > 1 && !Ctor->getParamDecl(1)->hasDefaultArg())) 5666 return false; 5667 5668 QualType ArgType = Ctor->getParamDecl(0)->getType(); 5669 if (const ReferenceType *RT = ArgType->getAs<ReferenceType>()) 5670 ArgType = RT->getPointeeType().getUnqualifiedType(); 5671 5672 return isStdInitializerList(ArgType, 0); 5673} 5674 5675/// \brief Determine whether a using statement is in a context where it will be 5676/// apply in all contexts. 5677static bool IsUsingDirectiveInToplevelContext(DeclContext *CurContext) { 5678 switch (CurContext->getDeclKind()) { 5679 case Decl::TranslationUnit: 5680 return true; 5681 case Decl::LinkageSpec: 5682 return IsUsingDirectiveInToplevelContext(CurContext->getParent()); 5683 default: 5684 return false; 5685 } 5686} 5687 5688namespace { 5689 5690// Callback to only accept typo corrections that are namespaces. 5691class NamespaceValidatorCCC : public CorrectionCandidateCallback { 5692 public: 5693 virtual bool ValidateCandidate(const TypoCorrection &candidate) { 5694 if (NamedDecl *ND = candidate.getCorrectionDecl()) { 5695 return isa<NamespaceDecl>(ND) || isa<NamespaceAliasDecl>(ND); 5696 } 5697 return false; 5698 } 5699}; 5700 5701} 5702 5703static bool TryNamespaceTypoCorrection(Sema &S, LookupResult &R, Scope *Sc, 5704 CXXScopeSpec &SS, 5705 SourceLocation IdentLoc, 5706 IdentifierInfo *Ident) { 5707 NamespaceValidatorCCC Validator; 5708 R.clear(); 5709 if (TypoCorrection Corrected = S.CorrectTypo(R.getLookupNameInfo(), 5710 R.getLookupKind(), Sc, &SS, 5711 Validator)) { 5712 std::string CorrectedStr(Corrected.getAsString(S.getLangOpts())); 5713 std::string CorrectedQuotedStr(Corrected.getQuoted(S.getLangOpts())); 5714 if (DeclContext *DC = S.computeDeclContext(SS, false)) 5715 S.Diag(IdentLoc, diag::err_using_directive_member_suggest) 5716 << Ident << DC << CorrectedQuotedStr << SS.getRange() 5717 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr); 5718 else 5719 S.Diag(IdentLoc, diag::err_using_directive_suggest) 5720 << Ident << CorrectedQuotedStr 5721 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr); 5722 5723 S.Diag(Corrected.getCorrectionDecl()->getLocation(), 5724 diag::note_namespace_defined_here) << CorrectedQuotedStr; 5725 5726 R.addDecl(Corrected.getCorrectionDecl()); 5727 return true; 5728 } 5729 return false; 5730} 5731 5732Decl *Sema::ActOnUsingDirective(Scope *S, 5733 SourceLocation UsingLoc, 5734 SourceLocation NamespcLoc, 5735 CXXScopeSpec &SS, 5736 SourceLocation IdentLoc, 5737 IdentifierInfo *NamespcName, 5738 AttributeList *AttrList) { 5739 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 5740 assert(NamespcName && "Invalid NamespcName."); 5741 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 5742 5743 // This can only happen along a recovery path. 5744 while (S->getFlags() & Scope::TemplateParamScope) 5745 S = S->getParent(); 5746 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 5747 5748 UsingDirectiveDecl *UDir = 0; 5749 NestedNameSpecifier *Qualifier = 0; 5750 if (SS.isSet()) 5751 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 5752 5753 // Lookup namespace name. 5754 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 5755 LookupParsedName(R, S, &SS); 5756 if (R.isAmbiguous()) 5757 return 0; 5758 5759 if (R.empty()) { 5760 R.clear(); 5761 // Allow "using namespace std;" or "using namespace ::std;" even if 5762 // "std" hasn't been defined yet, for GCC compatibility. 5763 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 5764 NamespcName->isStr("std")) { 5765 Diag(IdentLoc, diag::ext_using_undefined_std); 5766 R.addDecl(getOrCreateStdNamespace()); 5767 R.resolveKind(); 5768 } 5769 // Otherwise, attempt typo correction. 5770 else TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, NamespcName); 5771 } 5772 5773 if (!R.empty()) { 5774 NamedDecl *Named = R.getFoundDecl(); 5775 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 5776 && "expected namespace decl"); 5777 // C++ [namespace.udir]p1: 5778 // A using-directive specifies that the names in the nominated 5779 // namespace can be used in the scope in which the 5780 // using-directive appears after the using-directive. During 5781 // unqualified name lookup (3.4.1), the names appear as if they 5782 // were declared in the nearest enclosing namespace which 5783 // contains both the using-directive and the nominated 5784 // namespace. [Note: in this context, "contains" means "contains 5785 // directly or indirectly". ] 5786 5787 // Find enclosing context containing both using-directive and 5788 // nominated namespace. 5789 NamespaceDecl *NS = getNamespaceDecl(Named); 5790 DeclContext *CommonAncestor = cast<DeclContext>(NS); 5791 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 5792 CommonAncestor = CommonAncestor->getParent(); 5793 5794 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 5795 SS.getWithLocInContext(Context), 5796 IdentLoc, Named, CommonAncestor); 5797 5798 if (IsUsingDirectiveInToplevelContext(CurContext) && 5799 !SourceMgr.isFromMainFile(SourceMgr.getExpansionLoc(IdentLoc))) { 5800 Diag(IdentLoc, diag::warn_using_directive_in_header); 5801 } 5802 5803 PushUsingDirective(S, UDir); 5804 } else { 5805 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 5806 } 5807 5808 // FIXME: We ignore attributes for now. 5809 return UDir; 5810} 5811 5812void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 5813 // If the scope has an associated entity and the using directive is at 5814 // namespace or translation unit scope, add the UsingDirectiveDecl into 5815 // its lookup structure so qualified name lookup can find it. 5816 DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity()); 5817 if (Ctx && !Ctx->isFunctionOrMethod()) 5818 Ctx->addDecl(UDir); 5819 else 5820 // Otherwise, it is at block sope. The using-directives will affect lookup 5821 // only to the end of the scope. 5822 S->PushUsingDirective(UDir); 5823} 5824 5825 5826Decl *Sema::ActOnUsingDeclaration(Scope *S, 5827 AccessSpecifier AS, 5828 bool HasUsingKeyword, 5829 SourceLocation UsingLoc, 5830 CXXScopeSpec &SS, 5831 UnqualifiedId &Name, 5832 AttributeList *AttrList, 5833 bool IsTypeName, 5834 SourceLocation TypenameLoc) { 5835 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 5836 5837 switch (Name.getKind()) { 5838 case UnqualifiedId::IK_ImplicitSelfParam: 5839 case UnqualifiedId::IK_Identifier: 5840 case UnqualifiedId::IK_OperatorFunctionId: 5841 case UnqualifiedId::IK_LiteralOperatorId: 5842 case UnqualifiedId::IK_ConversionFunctionId: 5843 break; 5844 5845 case UnqualifiedId::IK_ConstructorName: 5846 case UnqualifiedId::IK_ConstructorTemplateId: 5847 // C++11 inheriting constructors. 5848 Diag(Name.getLocStart(), 5849 getLangOpts().CPlusPlus0x ? 5850 // FIXME: Produce warn_cxx98_compat_using_decl_constructor 5851 // instead once inheriting constructors work. 5852 diag::err_using_decl_constructor_unsupported : 5853 diag::err_using_decl_constructor) 5854 << SS.getRange(); 5855 5856 if (getLangOpts().CPlusPlus0x) break; 5857 5858 return 0; 5859 5860 case UnqualifiedId::IK_DestructorName: 5861 Diag(Name.getLocStart(), diag::err_using_decl_destructor) 5862 << SS.getRange(); 5863 return 0; 5864 5865 case UnqualifiedId::IK_TemplateId: 5866 Diag(Name.getLocStart(), diag::err_using_decl_template_id) 5867 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 5868 return 0; 5869 } 5870 5871 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name); 5872 DeclarationName TargetName = TargetNameInfo.getName(); 5873 if (!TargetName) 5874 return 0; 5875 5876 // Warn about using declarations. 5877 // TODO: store that the declaration was written without 'using' and 5878 // talk about access decls instead of using decls in the 5879 // diagnostics. 5880 if (!HasUsingKeyword) { 5881 UsingLoc = Name.getLocStart(); 5882 5883 Diag(UsingLoc, diag::warn_access_decl_deprecated) 5884 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 5885 } 5886 5887 if (DiagnoseUnexpandedParameterPack(SS, UPPC_UsingDeclaration) || 5888 DiagnoseUnexpandedParameterPack(TargetNameInfo, UPPC_UsingDeclaration)) 5889 return 0; 5890 5891 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 5892 TargetNameInfo, AttrList, 5893 /* IsInstantiation */ false, 5894 IsTypeName, TypenameLoc); 5895 if (UD) 5896 PushOnScopeChains(UD, S, /*AddToContext*/ false); 5897 5898 return UD; 5899} 5900 5901/// \brief Determine whether a using declaration considers the given 5902/// declarations as "equivalent", e.g., if they are redeclarations of 5903/// the same entity or are both typedefs of the same type. 5904static bool 5905IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2, 5906 bool &SuppressRedeclaration) { 5907 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) { 5908 SuppressRedeclaration = false; 5909 return true; 5910 } 5911 5912 if (TypedefNameDecl *TD1 = dyn_cast<TypedefNameDecl>(D1)) 5913 if (TypedefNameDecl *TD2 = dyn_cast<TypedefNameDecl>(D2)) { 5914 SuppressRedeclaration = true; 5915 return Context.hasSameType(TD1->getUnderlyingType(), 5916 TD2->getUnderlyingType()); 5917 } 5918 5919 return false; 5920} 5921 5922 5923/// Determines whether to create a using shadow decl for a particular 5924/// decl, given the set of decls existing prior to this using lookup. 5925bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 5926 const LookupResult &Previous) { 5927 // Diagnose finding a decl which is not from a base class of the 5928 // current class. We do this now because there are cases where this 5929 // function will silently decide not to build a shadow decl, which 5930 // will pre-empt further diagnostics. 5931 // 5932 // We don't need to do this in C++0x because we do the check once on 5933 // the qualifier. 5934 // 5935 // FIXME: diagnose the following if we care enough: 5936 // struct A { int foo; }; 5937 // struct B : A { using A::foo; }; 5938 // template <class T> struct C : A {}; 5939 // template <class T> struct D : C<T> { using B::foo; } // <--- 5940 // This is invalid (during instantiation) in C++03 because B::foo 5941 // resolves to the using decl in B, which is not a base class of D<T>. 5942 // We can't diagnose it immediately because C<T> is an unknown 5943 // specialization. The UsingShadowDecl in D<T> then points directly 5944 // to A::foo, which will look well-formed when we instantiate. 5945 // The right solution is to not collapse the shadow-decl chain. 5946 if (!getLangOpts().CPlusPlus0x && CurContext->isRecord()) { 5947 DeclContext *OrigDC = Orig->getDeclContext(); 5948 5949 // Handle enums and anonymous structs. 5950 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 5951 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 5952 while (OrigRec->isAnonymousStructOrUnion()) 5953 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 5954 5955 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 5956 if (OrigDC == CurContext) { 5957 Diag(Using->getLocation(), 5958 diag::err_using_decl_nested_name_specifier_is_current_class) 5959 << Using->getQualifierLoc().getSourceRange(); 5960 Diag(Orig->getLocation(), diag::note_using_decl_target); 5961 return true; 5962 } 5963 5964 Diag(Using->getQualifierLoc().getBeginLoc(), 5965 diag::err_using_decl_nested_name_specifier_is_not_base_class) 5966 << Using->getQualifier() 5967 << cast<CXXRecordDecl>(CurContext) 5968 << Using->getQualifierLoc().getSourceRange(); 5969 Diag(Orig->getLocation(), diag::note_using_decl_target); 5970 return true; 5971 } 5972 } 5973 5974 if (Previous.empty()) return false; 5975 5976 NamedDecl *Target = Orig; 5977 if (isa<UsingShadowDecl>(Target)) 5978 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 5979 5980 // If the target happens to be one of the previous declarations, we 5981 // don't have a conflict. 5982 // 5983 // FIXME: but we might be increasing its access, in which case we 5984 // should redeclare it. 5985 NamedDecl *NonTag = 0, *Tag = 0; 5986 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 5987 I != E; ++I) { 5988 NamedDecl *D = (*I)->getUnderlyingDecl(); 5989 bool Result; 5990 if (IsEquivalentForUsingDecl(Context, D, Target, Result)) 5991 return Result; 5992 5993 (isa<TagDecl>(D) ? Tag : NonTag) = D; 5994 } 5995 5996 if (Target->isFunctionOrFunctionTemplate()) { 5997 FunctionDecl *FD; 5998 if (isa<FunctionTemplateDecl>(Target)) 5999 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 6000 else 6001 FD = cast<FunctionDecl>(Target); 6002 6003 NamedDecl *OldDecl = 0; 6004 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 6005 case Ovl_Overload: 6006 return false; 6007 6008 case Ovl_NonFunction: 6009 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6010 break; 6011 6012 // We found a decl with the exact signature. 6013 case Ovl_Match: 6014 // If we're in a record, we want to hide the target, so we 6015 // return true (without a diagnostic) to tell the caller not to 6016 // build a shadow decl. 6017 if (CurContext->isRecord()) 6018 return true; 6019 6020 // If we're not in a record, this is an error. 6021 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6022 break; 6023 } 6024 6025 Diag(Target->getLocation(), diag::note_using_decl_target); 6026 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 6027 return true; 6028 } 6029 6030 // Target is not a function. 6031 6032 if (isa<TagDecl>(Target)) { 6033 // No conflict between a tag and a non-tag. 6034 if (!Tag) return false; 6035 6036 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6037 Diag(Target->getLocation(), diag::note_using_decl_target); 6038 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 6039 return true; 6040 } 6041 6042 // No conflict between a tag and a non-tag. 6043 if (!NonTag) return false; 6044 6045 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6046 Diag(Target->getLocation(), diag::note_using_decl_target); 6047 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 6048 return true; 6049} 6050 6051/// Builds a shadow declaration corresponding to a 'using' declaration. 6052UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 6053 UsingDecl *UD, 6054 NamedDecl *Orig) { 6055 6056 // If we resolved to another shadow declaration, just coalesce them. 6057 NamedDecl *Target = Orig; 6058 if (isa<UsingShadowDecl>(Target)) { 6059 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 6060 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 6061 } 6062 6063 UsingShadowDecl *Shadow 6064 = UsingShadowDecl::Create(Context, CurContext, 6065 UD->getLocation(), UD, Target); 6066 UD->addShadowDecl(Shadow); 6067 6068 Shadow->setAccess(UD->getAccess()); 6069 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 6070 Shadow->setInvalidDecl(); 6071 6072 if (S) 6073 PushOnScopeChains(Shadow, S); 6074 else 6075 CurContext->addDecl(Shadow); 6076 6077 6078 return Shadow; 6079} 6080 6081/// Hides a using shadow declaration. This is required by the current 6082/// using-decl implementation when a resolvable using declaration in a 6083/// class is followed by a declaration which would hide or override 6084/// one or more of the using decl's targets; for example: 6085/// 6086/// struct Base { void foo(int); }; 6087/// struct Derived : Base { 6088/// using Base::foo; 6089/// void foo(int); 6090/// }; 6091/// 6092/// The governing language is C++03 [namespace.udecl]p12: 6093/// 6094/// When a using-declaration brings names from a base class into a 6095/// derived class scope, member functions in the derived class 6096/// override and/or hide member functions with the same name and 6097/// parameter types in a base class (rather than conflicting). 6098/// 6099/// There are two ways to implement this: 6100/// (1) optimistically create shadow decls when they're not hidden 6101/// by existing declarations, or 6102/// (2) don't create any shadow decls (or at least don't make them 6103/// visible) until we've fully parsed/instantiated the class. 6104/// The problem with (1) is that we might have to retroactively remove 6105/// a shadow decl, which requires several O(n) operations because the 6106/// decl structures are (very reasonably) not designed for removal. 6107/// (2) avoids this but is very fiddly and phase-dependent. 6108void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 6109 if (Shadow->getDeclName().getNameKind() == 6110 DeclarationName::CXXConversionFunctionName) 6111 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 6112 6113 // Remove it from the DeclContext... 6114 Shadow->getDeclContext()->removeDecl(Shadow); 6115 6116 // ...and the scope, if applicable... 6117 if (S) { 6118 S->RemoveDecl(Shadow); 6119 IdResolver.RemoveDecl(Shadow); 6120 } 6121 6122 // ...and the using decl. 6123 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 6124 6125 // TODO: complain somehow if Shadow was used. It shouldn't 6126 // be possible for this to happen, because...? 6127} 6128 6129/// Builds a using declaration. 6130/// 6131/// \param IsInstantiation - Whether this call arises from an 6132/// instantiation of an unresolved using declaration. We treat 6133/// the lookup differently for these declarations. 6134NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 6135 SourceLocation UsingLoc, 6136 CXXScopeSpec &SS, 6137 const DeclarationNameInfo &NameInfo, 6138 AttributeList *AttrList, 6139 bool IsInstantiation, 6140 bool IsTypeName, 6141 SourceLocation TypenameLoc) { 6142 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 6143 SourceLocation IdentLoc = NameInfo.getLoc(); 6144 assert(IdentLoc.isValid() && "Invalid TargetName location."); 6145 6146 // FIXME: We ignore attributes for now. 6147 6148 if (SS.isEmpty()) { 6149 Diag(IdentLoc, diag::err_using_requires_qualname); 6150 return 0; 6151 } 6152 6153 // Do the redeclaration lookup in the current scope. 6154 LookupResult Previous(*this, NameInfo, LookupUsingDeclName, 6155 ForRedeclaration); 6156 Previous.setHideTags(false); 6157 if (S) { 6158 LookupName(Previous, S); 6159 6160 // It is really dumb that we have to do this. 6161 LookupResult::Filter F = Previous.makeFilter(); 6162 while (F.hasNext()) { 6163 NamedDecl *D = F.next(); 6164 if (!isDeclInScope(D, CurContext, S)) 6165 F.erase(); 6166 } 6167 F.done(); 6168 } else { 6169 assert(IsInstantiation && "no scope in non-instantiation"); 6170 assert(CurContext->isRecord() && "scope not record in instantiation"); 6171 LookupQualifiedName(Previous, CurContext); 6172 } 6173 6174 // Check for invalid redeclarations. 6175 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 6176 return 0; 6177 6178 // Check for bad qualifiers. 6179 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 6180 return 0; 6181 6182 DeclContext *LookupContext = computeDeclContext(SS); 6183 NamedDecl *D; 6184 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 6185 if (!LookupContext) { 6186 if (IsTypeName) { 6187 // FIXME: not all declaration name kinds are legal here 6188 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 6189 UsingLoc, TypenameLoc, 6190 QualifierLoc, 6191 IdentLoc, NameInfo.getName()); 6192 } else { 6193 D = UnresolvedUsingValueDecl::Create(Context, CurContext, UsingLoc, 6194 QualifierLoc, NameInfo); 6195 } 6196 } else { 6197 D = UsingDecl::Create(Context, CurContext, UsingLoc, QualifierLoc, 6198 NameInfo, IsTypeName); 6199 } 6200 D->setAccess(AS); 6201 CurContext->addDecl(D); 6202 6203 if (!LookupContext) return D; 6204 UsingDecl *UD = cast<UsingDecl>(D); 6205 6206 if (RequireCompleteDeclContext(SS, LookupContext)) { 6207 UD->setInvalidDecl(); 6208 return UD; 6209 } 6210 6211 // The normal rules do not apply to inheriting constructor declarations. 6212 if (NameInfo.getName().getNameKind() == DeclarationName::CXXConstructorName) { 6213 if (CheckInheritingConstructorUsingDecl(UD)) 6214 UD->setInvalidDecl(); 6215 return UD; 6216 } 6217 6218 // Otherwise, look up the target name. 6219 6220 LookupResult R(*this, NameInfo, LookupOrdinaryName); 6221 6222 // Unlike most lookups, we don't always want to hide tag 6223 // declarations: tag names are visible through the using declaration 6224 // even if hidden by ordinary names, *except* in a dependent context 6225 // where it's important for the sanity of two-phase lookup. 6226 if (!IsInstantiation) 6227 R.setHideTags(false); 6228 6229 // For the purposes of this lookup, we have a base object type 6230 // equal to that of the current context. 6231 if (CurContext->isRecord()) { 6232 R.setBaseObjectType( 6233 Context.getTypeDeclType(cast<CXXRecordDecl>(CurContext))); 6234 } 6235 6236 LookupQualifiedName(R, LookupContext); 6237 6238 if (R.empty()) { 6239 Diag(IdentLoc, diag::err_no_member) 6240 << NameInfo.getName() << LookupContext << SS.getRange(); 6241 UD->setInvalidDecl(); 6242 return UD; 6243 } 6244 6245 if (R.isAmbiguous()) { 6246 UD->setInvalidDecl(); 6247 return UD; 6248 } 6249 6250 if (IsTypeName) { 6251 // If we asked for a typename and got a non-type decl, error out. 6252 if (!R.getAsSingle<TypeDecl>()) { 6253 Diag(IdentLoc, diag::err_using_typename_non_type); 6254 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 6255 Diag((*I)->getUnderlyingDecl()->getLocation(), 6256 diag::note_using_decl_target); 6257 UD->setInvalidDecl(); 6258 return UD; 6259 } 6260 } else { 6261 // If we asked for a non-typename and we got a type, error out, 6262 // but only if this is an instantiation of an unresolved using 6263 // decl. Otherwise just silently find the type name. 6264 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 6265 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 6266 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 6267 UD->setInvalidDecl(); 6268 return UD; 6269 } 6270 } 6271 6272 // C++0x N2914 [namespace.udecl]p6: 6273 // A using-declaration shall not name a namespace. 6274 if (R.getAsSingle<NamespaceDecl>()) { 6275 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 6276 << SS.getRange(); 6277 UD->setInvalidDecl(); 6278 return UD; 6279 } 6280 6281 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 6282 if (!CheckUsingShadowDecl(UD, *I, Previous)) 6283 BuildUsingShadowDecl(S, UD, *I); 6284 } 6285 6286 return UD; 6287} 6288 6289/// Additional checks for a using declaration referring to a constructor name. 6290bool Sema::CheckInheritingConstructorUsingDecl(UsingDecl *UD) { 6291 assert(!UD->isTypeName() && "expecting a constructor name"); 6292 6293 const Type *SourceType = UD->getQualifier()->getAsType(); 6294 assert(SourceType && 6295 "Using decl naming constructor doesn't have type in scope spec."); 6296 CXXRecordDecl *TargetClass = cast<CXXRecordDecl>(CurContext); 6297 6298 // Check whether the named type is a direct base class. 6299 CanQualType CanonicalSourceType = SourceType->getCanonicalTypeUnqualified(); 6300 CXXRecordDecl::base_class_iterator BaseIt, BaseE; 6301 for (BaseIt = TargetClass->bases_begin(), BaseE = TargetClass->bases_end(); 6302 BaseIt != BaseE; ++BaseIt) { 6303 CanQualType BaseType = BaseIt->getType()->getCanonicalTypeUnqualified(); 6304 if (CanonicalSourceType == BaseType) 6305 break; 6306 if (BaseIt->getType()->isDependentType()) 6307 break; 6308 } 6309 6310 if (BaseIt == BaseE) { 6311 // Did not find SourceType in the bases. 6312 Diag(UD->getUsingLocation(), 6313 diag::err_using_decl_constructor_not_in_direct_base) 6314 << UD->getNameInfo().getSourceRange() 6315 << QualType(SourceType, 0) << TargetClass; 6316 return true; 6317 } 6318 6319 if (!CurContext->isDependentContext()) 6320 BaseIt->setInheritConstructors(); 6321 6322 return false; 6323} 6324 6325/// Checks that the given using declaration is not an invalid 6326/// redeclaration. Note that this is checking only for the using decl 6327/// itself, not for any ill-formedness among the UsingShadowDecls. 6328bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 6329 bool isTypeName, 6330 const CXXScopeSpec &SS, 6331 SourceLocation NameLoc, 6332 const LookupResult &Prev) { 6333 // C++03 [namespace.udecl]p8: 6334 // C++0x [namespace.udecl]p10: 6335 // A using-declaration is a declaration and can therefore be used 6336 // repeatedly where (and only where) multiple declarations are 6337 // allowed. 6338 // 6339 // That's in non-member contexts. 6340 if (!CurContext->getRedeclContext()->isRecord()) 6341 return false; 6342 6343 NestedNameSpecifier *Qual 6344 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 6345 6346 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 6347 NamedDecl *D = *I; 6348 6349 bool DTypename; 6350 NestedNameSpecifier *DQual; 6351 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 6352 DTypename = UD->isTypeName(); 6353 DQual = UD->getQualifier(); 6354 } else if (UnresolvedUsingValueDecl *UD 6355 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 6356 DTypename = false; 6357 DQual = UD->getQualifier(); 6358 } else if (UnresolvedUsingTypenameDecl *UD 6359 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 6360 DTypename = true; 6361 DQual = UD->getQualifier(); 6362 } else continue; 6363 6364 // using decls differ if one says 'typename' and the other doesn't. 6365 // FIXME: non-dependent using decls? 6366 if (isTypeName != DTypename) continue; 6367 6368 // using decls differ if they name different scopes (but note that 6369 // template instantiation can cause this check to trigger when it 6370 // didn't before instantiation). 6371 if (Context.getCanonicalNestedNameSpecifier(Qual) != 6372 Context.getCanonicalNestedNameSpecifier(DQual)) 6373 continue; 6374 6375 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 6376 Diag(D->getLocation(), diag::note_using_decl) << 1; 6377 return true; 6378 } 6379 6380 return false; 6381} 6382 6383 6384/// Checks that the given nested-name qualifier used in a using decl 6385/// in the current context is appropriately related to the current 6386/// scope. If an error is found, diagnoses it and returns true. 6387bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 6388 const CXXScopeSpec &SS, 6389 SourceLocation NameLoc) { 6390 DeclContext *NamedContext = computeDeclContext(SS); 6391 6392 if (!CurContext->isRecord()) { 6393 // C++03 [namespace.udecl]p3: 6394 // C++0x [namespace.udecl]p8: 6395 // A using-declaration for a class member shall be a member-declaration. 6396 6397 // If we weren't able to compute a valid scope, it must be a 6398 // dependent class scope. 6399 if (!NamedContext || NamedContext->isRecord()) { 6400 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 6401 << SS.getRange(); 6402 return true; 6403 } 6404 6405 // Otherwise, everything is known to be fine. 6406 return false; 6407 } 6408 6409 // The current scope is a record. 6410 6411 // If the named context is dependent, we can't decide much. 6412 if (!NamedContext) { 6413 // FIXME: in C++0x, we can diagnose if we can prove that the 6414 // nested-name-specifier does not refer to a base class, which is 6415 // still possible in some cases. 6416 6417 // Otherwise we have to conservatively report that things might be 6418 // okay. 6419 return false; 6420 } 6421 6422 if (!NamedContext->isRecord()) { 6423 // Ideally this would point at the last name in the specifier, 6424 // but we don't have that level of source info. 6425 Diag(SS.getRange().getBegin(), 6426 diag::err_using_decl_nested_name_specifier_is_not_class) 6427 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 6428 return true; 6429 } 6430 6431 if (!NamedContext->isDependentContext() && 6432 RequireCompleteDeclContext(const_cast<CXXScopeSpec&>(SS), NamedContext)) 6433 return true; 6434 6435 if (getLangOpts().CPlusPlus0x) { 6436 // C++0x [namespace.udecl]p3: 6437 // In a using-declaration used as a member-declaration, the 6438 // nested-name-specifier shall name a base class of the class 6439 // being defined. 6440 6441 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 6442 cast<CXXRecordDecl>(NamedContext))) { 6443 if (CurContext == NamedContext) { 6444 Diag(NameLoc, 6445 diag::err_using_decl_nested_name_specifier_is_current_class) 6446 << SS.getRange(); 6447 return true; 6448 } 6449 6450 Diag(SS.getRange().getBegin(), 6451 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6452 << (NestedNameSpecifier*) SS.getScopeRep() 6453 << cast<CXXRecordDecl>(CurContext) 6454 << SS.getRange(); 6455 return true; 6456 } 6457 6458 return false; 6459 } 6460 6461 // C++03 [namespace.udecl]p4: 6462 // A using-declaration used as a member-declaration shall refer 6463 // to a member of a base class of the class being defined [etc.]. 6464 6465 // Salient point: SS doesn't have to name a base class as long as 6466 // lookup only finds members from base classes. Therefore we can 6467 // diagnose here only if we can prove that that can't happen, 6468 // i.e. if the class hierarchies provably don't intersect. 6469 6470 // TODO: it would be nice if "definitely valid" results were cached 6471 // in the UsingDecl and UsingShadowDecl so that these checks didn't 6472 // need to be repeated. 6473 6474 struct UserData { 6475 llvm::SmallPtrSet<const CXXRecordDecl*, 4> Bases; 6476 6477 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 6478 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 6479 Data->Bases.insert(Base); 6480 return true; 6481 } 6482 6483 bool hasDependentBases(const CXXRecordDecl *Class) { 6484 return !Class->forallBases(collect, this); 6485 } 6486 6487 /// Returns true if the base is dependent or is one of the 6488 /// accumulated base classes. 6489 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 6490 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 6491 return !Data->Bases.count(Base); 6492 } 6493 6494 bool mightShareBases(const CXXRecordDecl *Class) { 6495 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 6496 } 6497 }; 6498 6499 UserData Data; 6500 6501 // Returns false if we find a dependent base. 6502 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 6503 return false; 6504 6505 // Returns false if the class has a dependent base or if it or one 6506 // of its bases is present in the base set of the current context. 6507 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 6508 return false; 6509 6510 Diag(SS.getRange().getBegin(), 6511 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6512 << (NestedNameSpecifier*) SS.getScopeRep() 6513 << cast<CXXRecordDecl>(CurContext) 6514 << SS.getRange(); 6515 6516 return true; 6517} 6518 6519Decl *Sema::ActOnAliasDeclaration(Scope *S, 6520 AccessSpecifier AS, 6521 MultiTemplateParamsArg TemplateParamLists, 6522 SourceLocation UsingLoc, 6523 UnqualifiedId &Name, 6524 TypeResult Type) { 6525 // Skip up to the relevant declaration scope. 6526 while (S->getFlags() & Scope::TemplateParamScope) 6527 S = S->getParent(); 6528 assert((S->getFlags() & Scope::DeclScope) && 6529 "got alias-declaration outside of declaration scope"); 6530 6531 if (Type.isInvalid()) 6532 return 0; 6533 6534 bool Invalid = false; 6535 DeclarationNameInfo NameInfo = GetNameFromUnqualifiedId(Name); 6536 TypeSourceInfo *TInfo = 0; 6537 GetTypeFromParser(Type.get(), &TInfo); 6538 6539 if (DiagnoseClassNameShadow(CurContext, NameInfo)) 6540 return 0; 6541 6542 if (DiagnoseUnexpandedParameterPack(Name.StartLocation, TInfo, 6543 UPPC_DeclarationType)) { 6544 Invalid = true; 6545 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 6546 TInfo->getTypeLoc().getBeginLoc()); 6547 } 6548 6549 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, ForRedeclaration); 6550 LookupName(Previous, S); 6551 6552 // Warn about shadowing the name of a template parameter. 6553 if (Previous.isSingleResult() && 6554 Previous.getFoundDecl()->isTemplateParameter()) { 6555 DiagnoseTemplateParameterShadow(Name.StartLocation,Previous.getFoundDecl()); 6556 Previous.clear(); 6557 } 6558 6559 assert(Name.Kind == UnqualifiedId::IK_Identifier && 6560 "name in alias declaration must be an identifier"); 6561 TypeAliasDecl *NewTD = TypeAliasDecl::Create(Context, CurContext, UsingLoc, 6562 Name.StartLocation, 6563 Name.Identifier, TInfo); 6564 6565 NewTD->setAccess(AS); 6566 6567 if (Invalid) 6568 NewTD->setInvalidDecl(); 6569 6570 CheckTypedefForVariablyModifiedType(S, NewTD); 6571 Invalid |= NewTD->isInvalidDecl(); 6572 6573 bool Redeclaration = false; 6574 6575 NamedDecl *NewND; 6576 if (TemplateParamLists.size()) { 6577 TypeAliasTemplateDecl *OldDecl = 0; 6578 TemplateParameterList *OldTemplateParams = 0; 6579 6580 if (TemplateParamLists.size() != 1) { 6581 Diag(UsingLoc, diag::err_alias_template_extra_headers) 6582 << SourceRange(TemplateParamLists[1]->getTemplateLoc(), 6583 TemplateParamLists[TemplateParamLists.size()-1]->getRAngleLoc()); 6584 } 6585 TemplateParameterList *TemplateParams = TemplateParamLists[0]; 6586 6587 // Only consider previous declarations in the same scope. 6588 FilterLookupForScope(Previous, CurContext, S, /*ConsiderLinkage*/false, 6589 /*ExplicitInstantiationOrSpecialization*/false); 6590 if (!Previous.empty()) { 6591 Redeclaration = true; 6592 6593 OldDecl = Previous.getAsSingle<TypeAliasTemplateDecl>(); 6594 if (!OldDecl && !Invalid) { 6595 Diag(UsingLoc, diag::err_redefinition_different_kind) 6596 << Name.Identifier; 6597 6598 NamedDecl *OldD = Previous.getRepresentativeDecl(); 6599 if (OldD->getLocation().isValid()) 6600 Diag(OldD->getLocation(), diag::note_previous_definition); 6601 6602 Invalid = true; 6603 } 6604 6605 if (!Invalid && OldDecl && !OldDecl->isInvalidDecl()) { 6606 if (TemplateParameterListsAreEqual(TemplateParams, 6607 OldDecl->getTemplateParameters(), 6608 /*Complain=*/true, 6609 TPL_TemplateMatch)) 6610 OldTemplateParams = OldDecl->getTemplateParameters(); 6611 else 6612 Invalid = true; 6613 6614 TypeAliasDecl *OldTD = OldDecl->getTemplatedDecl(); 6615 if (!Invalid && 6616 !Context.hasSameType(OldTD->getUnderlyingType(), 6617 NewTD->getUnderlyingType())) { 6618 // FIXME: The C++0x standard does not clearly say this is ill-formed, 6619 // but we can't reasonably accept it. 6620 Diag(NewTD->getLocation(), diag::err_redefinition_different_typedef) 6621 << 2 << NewTD->getUnderlyingType() << OldTD->getUnderlyingType(); 6622 if (OldTD->getLocation().isValid()) 6623 Diag(OldTD->getLocation(), diag::note_previous_definition); 6624 Invalid = true; 6625 } 6626 } 6627 } 6628 6629 // Merge any previous default template arguments into our parameters, 6630 // and check the parameter list. 6631 if (CheckTemplateParameterList(TemplateParams, OldTemplateParams, 6632 TPC_TypeAliasTemplate)) 6633 return 0; 6634 6635 TypeAliasTemplateDecl *NewDecl = 6636 TypeAliasTemplateDecl::Create(Context, CurContext, UsingLoc, 6637 Name.Identifier, TemplateParams, 6638 NewTD); 6639 6640 NewDecl->setAccess(AS); 6641 6642 if (Invalid) 6643 NewDecl->setInvalidDecl(); 6644 else if (OldDecl) 6645 NewDecl->setPreviousDeclaration(OldDecl); 6646 6647 NewND = NewDecl; 6648 } else { 6649 ActOnTypedefNameDecl(S, CurContext, NewTD, Previous, Redeclaration); 6650 NewND = NewTD; 6651 } 6652 6653 if (!Redeclaration) 6654 PushOnScopeChains(NewND, S); 6655 6656 ActOnDocumentableDecl(NewND); 6657 return NewND; 6658} 6659 6660Decl *Sema::ActOnNamespaceAliasDef(Scope *S, 6661 SourceLocation NamespaceLoc, 6662 SourceLocation AliasLoc, 6663 IdentifierInfo *Alias, 6664 CXXScopeSpec &SS, 6665 SourceLocation IdentLoc, 6666 IdentifierInfo *Ident) { 6667 6668 // Lookup the namespace name. 6669 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 6670 LookupParsedName(R, S, &SS); 6671 6672 // Check if we have a previous declaration with the same name. 6673 NamedDecl *PrevDecl 6674 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 6675 ForRedeclaration); 6676 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 6677 PrevDecl = 0; 6678 6679 if (PrevDecl) { 6680 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 6681 // We already have an alias with the same name that points to the same 6682 // namespace, so don't create a new one. 6683 // FIXME: At some point, we'll want to create the (redundant) 6684 // declaration to maintain better source information. 6685 if (!R.isAmbiguous() && !R.empty() && 6686 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 6687 return 0; 6688 } 6689 6690 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 6691 diag::err_redefinition_different_kind; 6692 Diag(AliasLoc, DiagID) << Alias; 6693 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 6694 return 0; 6695 } 6696 6697 if (R.isAmbiguous()) 6698 return 0; 6699 6700 if (R.empty()) { 6701 if (!TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, Ident)) { 6702 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 6703 return 0; 6704 } 6705 } 6706 6707 NamespaceAliasDecl *AliasDecl = 6708 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 6709 Alias, SS.getWithLocInContext(Context), 6710 IdentLoc, R.getFoundDecl()); 6711 6712 PushOnScopeChains(AliasDecl, S); 6713 return AliasDecl; 6714} 6715 6716namespace { 6717 /// \brief Scoped object used to handle the state changes required in Sema 6718 /// to implicitly define the body of a C++ member function; 6719 class ImplicitlyDefinedFunctionScope { 6720 Sema &S; 6721 Sema::ContextRAII SavedContext; 6722 6723 public: 6724 ImplicitlyDefinedFunctionScope(Sema &S, CXXMethodDecl *Method) 6725 : S(S), SavedContext(S, Method) 6726 { 6727 S.PushFunctionScope(); 6728 S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated); 6729 } 6730 6731 ~ImplicitlyDefinedFunctionScope() { 6732 S.PopExpressionEvaluationContext(); 6733 S.PopFunctionScopeInfo(); 6734 } 6735 }; 6736} 6737 6738Sema::ImplicitExceptionSpecification 6739Sema::ComputeDefaultedDefaultCtorExceptionSpec(SourceLocation Loc, 6740 CXXMethodDecl *MD) { 6741 CXXRecordDecl *ClassDecl = MD->getParent(); 6742 6743 // C++ [except.spec]p14: 6744 // An implicitly declared special member function (Clause 12) shall have an 6745 // exception-specification. [...] 6746 ImplicitExceptionSpecification ExceptSpec(*this); 6747 if (ClassDecl->isInvalidDecl()) 6748 return ExceptSpec; 6749 6750 // Direct base-class constructors. 6751 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 6752 BEnd = ClassDecl->bases_end(); 6753 B != BEnd; ++B) { 6754 if (B->isVirtual()) // Handled below. 6755 continue; 6756 6757 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 6758 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 6759 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 6760 // If this is a deleted function, add it anyway. This might be conformant 6761 // with the standard. This might not. I'm not sure. It might not matter. 6762 if (Constructor) 6763 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 6764 } 6765 } 6766 6767 // Virtual base-class constructors. 6768 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 6769 BEnd = ClassDecl->vbases_end(); 6770 B != BEnd; ++B) { 6771 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 6772 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 6773 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 6774 // If this is a deleted function, add it anyway. This might be conformant 6775 // with the standard. This might not. I'm not sure. It might not matter. 6776 if (Constructor) 6777 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 6778 } 6779 } 6780 6781 // Field constructors. 6782 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 6783 FEnd = ClassDecl->field_end(); 6784 F != FEnd; ++F) { 6785 if (F->hasInClassInitializer()) { 6786 if (Expr *E = F->getInClassInitializer()) 6787 ExceptSpec.CalledExpr(E); 6788 else if (!F->isInvalidDecl()) 6789 // DR1351: 6790 // If the brace-or-equal-initializer of a non-static data member 6791 // invokes a defaulted default constructor of its class or of an 6792 // enclosing class in a potentially evaluated subexpression, the 6793 // program is ill-formed. 6794 // 6795 // This resolution is unworkable: the exception specification of the 6796 // default constructor can be needed in an unevaluated context, in 6797 // particular, in the operand of a noexcept-expression, and we can be 6798 // unable to compute an exception specification for an enclosed class. 6799 // 6800 // We do not allow an in-class initializer to require the evaluation 6801 // of the exception specification for any in-class initializer whose 6802 // definition is not lexically complete. 6803 Diag(Loc, diag::err_in_class_initializer_references_def_ctor) << MD; 6804 } else if (const RecordType *RecordTy 6805 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 6806 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 6807 CXXConstructorDecl *Constructor = LookupDefaultConstructor(FieldRecDecl); 6808 // If this is a deleted function, add it anyway. This might be conformant 6809 // with the standard. This might not. I'm not sure. It might not matter. 6810 // In particular, the problem is that this function never gets called. It 6811 // might just be ill-formed because this function attempts to refer to 6812 // a deleted function here. 6813 if (Constructor) 6814 ExceptSpec.CalledDecl(F->getLocation(), Constructor); 6815 } 6816 } 6817 6818 return ExceptSpec; 6819} 6820 6821CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( 6822 CXXRecordDecl *ClassDecl) { 6823 // C++ [class.ctor]p5: 6824 // A default constructor for a class X is a constructor of class X 6825 // that can be called without an argument. If there is no 6826 // user-declared constructor for class X, a default constructor is 6827 // implicitly declared. An implicitly-declared default constructor 6828 // is an inline public member of its class. 6829 assert(!ClassDecl->hasUserDeclaredConstructor() && 6830 "Should not build implicit default constructor!"); 6831 6832 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, 6833 CXXDefaultConstructor, 6834 false); 6835 6836 // Create the actual constructor declaration. 6837 CanQualType ClassType 6838 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 6839 SourceLocation ClassLoc = ClassDecl->getLocation(); 6840 DeclarationName Name 6841 = Context.DeclarationNames.getCXXConstructorName(ClassType); 6842 DeclarationNameInfo NameInfo(Name, ClassLoc); 6843 CXXConstructorDecl *DefaultCon = CXXConstructorDecl::Create( 6844 Context, ClassDecl, ClassLoc, NameInfo, /*Type*/QualType(), /*TInfo=*/0, 6845 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 6846 Constexpr); 6847 DefaultCon->setAccess(AS_public); 6848 DefaultCon->setDefaulted(); 6849 DefaultCon->setImplicit(); 6850 DefaultCon->setTrivial(ClassDecl->hasTrivialDefaultConstructor()); 6851 6852 // Build an exception specification pointing back at this constructor. 6853 FunctionProtoType::ExtProtoInfo EPI; 6854 EPI.ExceptionSpecType = EST_Unevaluated; 6855 EPI.ExceptionSpecDecl = DefaultCon; 6856 DefaultCon->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 6857 6858 // Note that we have declared this constructor. 6859 ++ASTContext::NumImplicitDefaultConstructorsDeclared; 6860 6861 if (Scope *S = getScopeForContext(ClassDecl)) 6862 PushOnScopeChains(DefaultCon, S, false); 6863 ClassDecl->addDecl(DefaultCon); 6864 6865 if (ShouldDeleteSpecialMember(DefaultCon, CXXDefaultConstructor)) 6866 DefaultCon->setDeletedAsWritten(); 6867 6868 return DefaultCon; 6869} 6870 6871void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 6872 CXXConstructorDecl *Constructor) { 6873 assert((Constructor->isDefaulted() && Constructor->isDefaultConstructor() && 6874 !Constructor->doesThisDeclarationHaveABody() && 6875 !Constructor->isDeleted()) && 6876 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 6877 6878 CXXRecordDecl *ClassDecl = Constructor->getParent(); 6879 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 6880 6881 ImplicitlyDefinedFunctionScope Scope(*this, Constructor); 6882 DiagnosticErrorTrap Trap(Diags); 6883 if (SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false) || 6884 Trap.hasErrorOccurred()) { 6885 Diag(CurrentLocation, diag::note_member_synthesized_at) 6886 << CXXDefaultConstructor << Context.getTagDeclType(ClassDecl); 6887 Constructor->setInvalidDecl(); 6888 return; 6889 } 6890 6891 SourceLocation Loc = Constructor->getLocation(); 6892 Constructor->setBody(new (Context) CompoundStmt(Loc)); 6893 6894 Constructor->setUsed(); 6895 MarkVTableUsed(CurrentLocation, ClassDecl); 6896 6897 if (ASTMutationListener *L = getASTMutationListener()) { 6898 L->CompletedImplicitDefinition(Constructor); 6899 } 6900} 6901 6902void Sema::ActOnFinishDelayedMemberInitializers(Decl *D) { 6903 if (!D) return; 6904 AdjustDeclIfTemplate(D); 6905 6906 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(D); 6907 6908 if (!ClassDecl->isDependentType()) 6909 CheckExplicitlyDefaultedMethods(ClassDecl); 6910} 6911 6912void Sema::DeclareInheritedConstructors(CXXRecordDecl *ClassDecl) { 6913 // We start with an initial pass over the base classes to collect those that 6914 // inherit constructors from. If there are none, we can forgo all further 6915 // processing. 6916 typedef SmallVector<const RecordType *, 4> BasesVector; 6917 BasesVector BasesToInheritFrom; 6918 for (CXXRecordDecl::base_class_iterator BaseIt = ClassDecl->bases_begin(), 6919 BaseE = ClassDecl->bases_end(); 6920 BaseIt != BaseE; ++BaseIt) { 6921 if (BaseIt->getInheritConstructors()) { 6922 QualType Base = BaseIt->getType(); 6923 if (Base->isDependentType()) { 6924 // If we inherit constructors from anything that is dependent, just 6925 // abort processing altogether. We'll get another chance for the 6926 // instantiations. 6927 return; 6928 } 6929 BasesToInheritFrom.push_back(Base->castAs<RecordType>()); 6930 } 6931 } 6932 if (BasesToInheritFrom.empty()) 6933 return; 6934 6935 // Now collect the constructors that we already have in the current class. 6936 // Those take precedence over inherited constructors. 6937 // C++0x [class.inhctor]p3: [...] a constructor is implicitly declared [...] 6938 // unless there is a user-declared constructor with the same signature in 6939 // the class where the using-declaration appears. 6940 llvm::SmallSet<const Type *, 8> ExistingConstructors; 6941 for (CXXRecordDecl::ctor_iterator CtorIt = ClassDecl->ctor_begin(), 6942 CtorE = ClassDecl->ctor_end(); 6943 CtorIt != CtorE; ++CtorIt) { 6944 ExistingConstructors.insert( 6945 Context.getCanonicalType(CtorIt->getType()).getTypePtr()); 6946 } 6947 6948 DeclarationName CreatedCtorName = 6949 Context.DeclarationNames.getCXXConstructorName( 6950 ClassDecl->getTypeForDecl()->getCanonicalTypeUnqualified()); 6951 6952 // Now comes the true work. 6953 // First, we keep a map from constructor types to the base that introduced 6954 // them. Needed for finding conflicting constructors. We also keep the 6955 // actually inserted declarations in there, for pretty diagnostics. 6956 typedef std::pair<CanQualType, CXXConstructorDecl *> ConstructorInfo; 6957 typedef llvm::DenseMap<const Type *, ConstructorInfo> ConstructorToSourceMap; 6958 ConstructorToSourceMap InheritedConstructors; 6959 for (BasesVector::iterator BaseIt = BasesToInheritFrom.begin(), 6960 BaseE = BasesToInheritFrom.end(); 6961 BaseIt != BaseE; ++BaseIt) { 6962 const RecordType *Base = *BaseIt; 6963 CanQualType CanonicalBase = Base->getCanonicalTypeUnqualified(); 6964 CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(Base->getDecl()); 6965 for (CXXRecordDecl::ctor_iterator CtorIt = BaseDecl->ctor_begin(), 6966 CtorE = BaseDecl->ctor_end(); 6967 CtorIt != CtorE; ++CtorIt) { 6968 // Find the using declaration for inheriting this base's constructors. 6969 // FIXME: Don't perform name lookup just to obtain a source location! 6970 DeclarationName Name = 6971 Context.DeclarationNames.getCXXConstructorName(CanonicalBase); 6972 LookupResult Result(*this, Name, SourceLocation(), LookupUsingDeclName); 6973 LookupQualifiedName(Result, CurContext); 6974 UsingDecl *UD = Result.getAsSingle<UsingDecl>(); 6975 SourceLocation UsingLoc = UD ? UD->getLocation() : 6976 ClassDecl->getLocation(); 6977 6978 // C++0x [class.inhctor]p1: The candidate set of inherited constructors 6979 // from the class X named in the using-declaration consists of actual 6980 // constructors and notional constructors that result from the 6981 // transformation of defaulted parameters as follows: 6982 // - all non-template default constructors of X, and 6983 // - for each non-template constructor of X that has at least one 6984 // parameter with a default argument, the set of constructors that 6985 // results from omitting any ellipsis parameter specification and 6986 // successively omitting parameters with a default argument from the 6987 // end of the parameter-type-list. 6988 CXXConstructorDecl *BaseCtor = *CtorIt; 6989 bool CanBeCopyOrMove = BaseCtor->isCopyOrMoveConstructor(); 6990 const FunctionProtoType *BaseCtorType = 6991 BaseCtor->getType()->getAs<FunctionProtoType>(); 6992 6993 for (unsigned params = BaseCtor->getMinRequiredArguments(), 6994 maxParams = BaseCtor->getNumParams(); 6995 params <= maxParams; ++params) { 6996 // Skip default constructors. They're never inherited. 6997 if (params == 0) 6998 continue; 6999 // Skip copy and move constructors for the same reason. 7000 if (CanBeCopyOrMove && params == 1) 7001 continue; 7002 7003 // Build up a function type for this particular constructor. 7004 // FIXME: The working paper does not consider that the exception spec 7005 // for the inheriting constructor might be larger than that of the 7006 // source. This code doesn't yet, either. When it does, this code will 7007 // need to be delayed until after exception specifications and in-class 7008 // member initializers are attached. 7009 const Type *NewCtorType; 7010 if (params == maxParams) 7011 NewCtorType = BaseCtorType; 7012 else { 7013 SmallVector<QualType, 16> Args; 7014 for (unsigned i = 0; i < params; ++i) { 7015 Args.push_back(BaseCtorType->getArgType(i)); 7016 } 7017 FunctionProtoType::ExtProtoInfo ExtInfo = 7018 BaseCtorType->getExtProtoInfo(); 7019 ExtInfo.Variadic = false; 7020 NewCtorType = Context.getFunctionType(BaseCtorType->getResultType(), 7021 Args.data(), params, ExtInfo) 7022 .getTypePtr(); 7023 } 7024 const Type *CanonicalNewCtorType = 7025 Context.getCanonicalType(NewCtorType); 7026 7027 // Now that we have the type, first check if the class already has a 7028 // constructor with this signature. 7029 if (ExistingConstructors.count(CanonicalNewCtorType)) 7030 continue; 7031 7032 // Then we check if we have already declared an inherited constructor 7033 // with this signature. 7034 std::pair<ConstructorToSourceMap::iterator, bool> result = 7035 InheritedConstructors.insert(std::make_pair( 7036 CanonicalNewCtorType, 7037 std::make_pair(CanonicalBase, (CXXConstructorDecl*)0))); 7038 if (!result.second) { 7039 // Already in the map. If it came from a different class, that's an 7040 // error. Not if it's from the same. 7041 CanQualType PreviousBase = result.first->second.first; 7042 if (CanonicalBase != PreviousBase) { 7043 const CXXConstructorDecl *PrevCtor = result.first->second.second; 7044 const CXXConstructorDecl *PrevBaseCtor = 7045 PrevCtor->getInheritedConstructor(); 7046 assert(PrevBaseCtor && "Conflicting constructor was not inherited"); 7047 7048 Diag(UsingLoc, diag::err_using_decl_constructor_conflict); 7049 Diag(BaseCtor->getLocation(), 7050 diag::note_using_decl_constructor_conflict_current_ctor); 7051 Diag(PrevBaseCtor->getLocation(), 7052 diag::note_using_decl_constructor_conflict_previous_ctor); 7053 Diag(PrevCtor->getLocation(), 7054 diag::note_using_decl_constructor_conflict_previous_using); 7055 } 7056 continue; 7057 } 7058 7059 // OK, we're there, now add the constructor. 7060 // C++0x [class.inhctor]p8: [...] that would be performed by a 7061 // user-written inline constructor [...] 7062 DeclarationNameInfo DNI(CreatedCtorName, UsingLoc); 7063 CXXConstructorDecl *NewCtor = CXXConstructorDecl::Create( 7064 Context, ClassDecl, UsingLoc, DNI, QualType(NewCtorType, 0), 7065 /*TInfo=*/0, BaseCtor->isExplicit(), /*Inline=*/true, 7066 /*ImplicitlyDeclared=*/true, 7067 // FIXME: Due to a defect in the standard, we treat inherited 7068 // constructors as constexpr even if that makes them ill-formed. 7069 /*Constexpr=*/BaseCtor->isConstexpr()); 7070 NewCtor->setAccess(BaseCtor->getAccess()); 7071 7072 // Build up the parameter decls and add them. 7073 SmallVector<ParmVarDecl *, 16> ParamDecls; 7074 for (unsigned i = 0; i < params; ++i) { 7075 ParamDecls.push_back(ParmVarDecl::Create(Context, NewCtor, 7076 UsingLoc, UsingLoc, 7077 /*IdentifierInfo=*/0, 7078 BaseCtorType->getArgType(i), 7079 /*TInfo=*/0, SC_None, 7080 SC_None, /*DefaultArg=*/0)); 7081 } 7082 NewCtor->setParams(ParamDecls); 7083 NewCtor->setInheritedConstructor(BaseCtor); 7084 7085 ClassDecl->addDecl(NewCtor); 7086 result.first->second.second = NewCtor; 7087 } 7088 } 7089 } 7090} 7091 7092Sema::ImplicitExceptionSpecification 7093Sema::ComputeDefaultedDtorExceptionSpec(CXXMethodDecl *MD) { 7094 CXXRecordDecl *ClassDecl = MD->getParent(); 7095 7096 // C++ [except.spec]p14: 7097 // An implicitly declared special member function (Clause 12) shall have 7098 // an exception-specification. 7099 ImplicitExceptionSpecification ExceptSpec(*this); 7100 if (ClassDecl->isInvalidDecl()) 7101 return ExceptSpec; 7102 7103 // Direct base-class destructors. 7104 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 7105 BEnd = ClassDecl->bases_end(); 7106 B != BEnd; ++B) { 7107 if (B->isVirtual()) // Handled below. 7108 continue; 7109 7110 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 7111 ExceptSpec.CalledDecl(B->getLocStart(), 7112 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 7113 } 7114 7115 // Virtual base-class destructors. 7116 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 7117 BEnd = ClassDecl->vbases_end(); 7118 B != BEnd; ++B) { 7119 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 7120 ExceptSpec.CalledDecl(B->getLocStart(), 7121 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 7122 } 7123 7124 // Field destructors. 7125 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 7126 FEnd = ClassDecl->field_end(); 7127 F != FEnd; ++F) { 7128 if (const RecordType *RecordTy 7129 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 7130 ExceptSpec.CalledDecl(F->getLocation(), 7131 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl()))); 7132 } 7133 7134 return ExceptSpec; 7135} 7136 7137CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { 7138 // C++ [class.dtor]p2: 7139 // If a class has no user-declared destructor, a destructor is 7140 // declared implicitly. An implicitly-declared destructor is an 7141 // inline public member of its class. 7142 7143 // Create the actual destructor declaration. 7144 CanQualType ClassType 7145 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 7146 SourceLocation ClassLoc = ClassDecl->getLocation(); 7147 DeclarationName Name 7148 = Context.DeclarationNames.getCXXDestructorName(ClassType); 7149 DeclarationNameInfo NameInfo(Name, ClassLoc); 7150 CXXDestructorDecl *Destructor 7151 = CXXDestructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 7152 QualType(), 0, /*isInline=*/true, 7153 /*isImplicitlyDeclared=*/true); 7154 Destructor->setAccess(AS_public); 7155 Destructor->setDefaulted(); 7156 Destructor->setImplicit(); 7157 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 7158 7159 // Build an exception specification pointing back at this destructor. 7160 FunctionProtoType::ExtProtoInfo EPI; 7161 EPI.ExceptionSpecType = EST_Unevaluated; 7162 EPI.ExceptionSpecDecl = Destructor; 7163 Destructor->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 7164 7165 // Note that we have declared this destructor. 7166 ++ASTContext::NumImplicitDestructorsDeclared; 7167 7168 // Introduce this destructor into its scope. 7169 if (Scope *S = getScopeForContext(ClassDecl)) 7170 PushOnScopeChains(Destructor, S, false); 7171 ClassDecl->addDecl(Destructor); 7172 7173 AddOverriddenMethods(ClassDecl, Destructor); 7174 7175 if (ShouldDeleteSpecialMember(Destructor, CXXDestructor)) 7176 Destructor->setDeletedAsWritten(); 7177 7178 return Destructor; 7179} 7180 7181void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 7182 CXXDestructorDecl *Destructor) { 7183 assert((Destructor->isDefaulted() && 7184 !Destructor->doesThisDeclarationHaveABody() && 7185 !Destructor->isDeleted()) && 7186 "DefineImplicitDestructor - call it for implicit default dtor"); 7187 CXXRecordDecl *ClassDecl = Destructor->getParent(); 7188 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 7189 7190 if (Destructor->isInvalidDecl()) 7191 return; 7192 7193 ImplicitlyDefinedFunctionScope Scope(*this, Destructor); 7194 7195 DiagnosticErrorTrap Trap(Diags); 7196 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 7197 Destructor->getParent()); 7198 7199 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 7200 Diag(CurrentLocation, diag::note_member_synthesized_at) 7201 << CXXDestructor << Context.getTagDeclType(ClassDecl); 7202 7203 Destructor->setInvalidDecl(); 7204 return; 7205 } 7206 7207 SourceLocation Loc = Destructor->getLocation(); 7208 Destructor->setBody(new (Context) CompoundStmt(Loc)); 7209 Destructor->setImplicitlyDefined(true); 7210 Destructor->setUsed(); 7211 MarkVTableUsed(CurrentLocation, ClassDecl); 7212 7213 if (ASTMutationListener *L = getASTMutationListener()) { 7214 L->CompletedImplicitDefinition(Destructor); 7215 } 7216} 7217 7218/// \brief Perform any semantic analysis which needs to be delayed until all 7219/// pending class member declarations have been parsed. 7220void Sema::ActOnFinishCXXMemberDecls() { 7221 // Perform any deferred checking of exception specifications for virtual 7222 // destructors. 7223 for (unsigned i = 0, e = DelayedDestructorExceptionSpecChecks.size(); 7224 i != e; ++i) { 7225 const CXXDestructorDecl *Dtor = 7226 DelayedDestructorExceptionSpecChecks[i].first; 7227 assert(!Dtor->getParent()->isDependentType() && 7228 "Should not ever add destructors of templates into the list."); 7229 CheckOverridingFunctionExceptionSpec(Dtor, 7230 DelayedDestructorExceptionSpecChecks[i].second); 7231 } 7232 DelayedDestructorExceptionSpecChecks.clear(); 7233} 7234 7235void Sema::AdjustDestructorExceptionSpec(CXXRecordDecl *ClassDecl, 7236 CXXDestructorDecl *Destructor) { 7237 assert(getLangOpts().CPlusPlus0x && 7238 "adjusting dtor exception specs was introduced in c++11"); 7239 7240 // C++11 [class.dtor]p3: 7241 // A declaration of a destructor that does not have an exception- 7242 // specification is implicitly considered to have the same exception- 7243 // specification as an implicit declaration. 7244 const FunctionProtoType *DtorType = Destructor->getType()-> 7245 getAs<FunctionProtoType>(); 7246 if (DtorType->hasExceptionSpec()) 7247 return; 7248 7249 // Replace the destructor's type, building off the existing one. Fortunately, 7250 // the only thing of interest in the destructor type is its extended info. 7251 // The return and arguments are fixed. 7252 FunctionProtoType::ExtProtoInfo EPI = DtorType->getExtProtoInfo(); 7253 EPI.ExceptionSpecType = EST_Unevaluated; 7254 EPI.ExceptionSpecDecl = Destructor; 7255 Destructor->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 7256 7257 // FIXME: If the destructor has a body that could throw, and the newly created 7258 // spec doesn't allow exceptions, we should emit a warning, because this 7259 // change in behavior can break conforming C++03 programs at runtime. 7260 // However, we don't have a body or an exception specification yet, so it 7261 // needs to be done somewhere else. 7262} 7263 7264/// \brief Builds a statement that copies/moves the given entity from \p From to 7265/// \c To. 7266/// 7267/// This routine is used to copy/move the members of a class with an 7268/// implicitly-declared copy/move assignment operator. When the entities being 7269/// copied are arrays, this routine builds for loops to copy them. 7270/// 7271/// \param S The Sema object used for type-checking. 7272/// 7273/// \param Loc The location where the implicit copy/move is being generated. 7274/// 7275/// \param T The type of the expressions being copied/moved. Both expressions 7276/// must have this type. 7277/// 7278/// \param To The expression we are copying/moving to. 7279/// 7280/// \param From The expression we are copying/moving from. 7281/// 7282/// \param CopyingBaseSubobject Whether we're copying/moving a base subobject. 7283/// Otherwise, it's a non-static member subobject. 7284/// 7285/// \param Copying Whether we're copying or moving. 7286/// 7287/// \param Depth Internal parameter recording the depth of the recursion. 7288/// 7289/// \returns A statement or a loop that copies the expressions. 7290static StmtResult 7291BuildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 7292 Expr *To, Expr *From, 7293 bool CopyingBaseSubobject, bool Copying, 7294 unsigned Depth = 0) { 7295 // C++0x [class.copy]p28: 7296 // Each subobject is assigned in the manner appropriate to its type: 7297 // 7298 // - if the subobject is of class type, as if by a call to operator= with 7299 // the subobject as the object expression and the corresponding 7300 // subobject of x as a single function argument (as if by explicit 7301 // qualification; that is, ignoring any possible virtual overriding 7302 // functions in more derived classes); 7303 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 7304 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 7305 7306 // Look for operator=. 7307 DeclarationName Name 7308 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 7309 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 7310 S.LookupQualifiedName(OpLookup, ClassDecl, false); 7311 7312 // Filter out any result that isn't a copy/move-assignment operator. 7313 LookupResult::Filter F = OpLookup.makeFilter(); 7314 while (F.hasNext()) { 7315 NamedDecl *D = F.next(); 7316 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 7317 if (Method->isCopyAssignmentOperator() || 7318 (!Copying && Method->isMoveAssignmentOperator())) 7319 continue; 7320 7321 F.erase(); 7322 } 7323 F.done(); 7324 7325 // Suppress the protected check (C++ [class.protected]) for each of the 7326 // assignment operators we found. This strange dance is required when 7327 // we're assigning via a base classes's copy-assignment operator. To 7328 // ensure that we're getting the right base class subobject (without 7329 // ambiguities), we need to cast "this" to that subobject type; to 7330 // ensure that we don't go through the virtual call mechanism, we need 7331 // to qualify the operator= name with the base class (see below). However, 7332 // this means that if the base class has a protected copy assignment 7333 // operator, the protected member access check will fail. So, we 7334 // rewrite "protected" access to "public" access in this case, since we 7335 // know by construction that we're calling from a derived class. 7336 if (CopyingBaseSubobject) { 7337 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 7338 L != LEnd; ++L) { 7339 if (L.getAccess() == AS_protected) 7340 L.setAccess(AS_public); 7341 } 7342 } 7343 7344 // Create the nested-name-specifier that will be used to qualify the 7345 // reference to operator=; this is required to suppress the virtual 7346 // call mechanism. 7347 CXXScopeSpec SS; 7348 const Type *CanonicalT = S.Context.getCanonicalType(T.getTypePtr()); 7349 SS.MakeTrivial(S.Context, 7350 NestedNameSpecifier::Create(S.Context, 0, false, 7351 CanonicalT), 7352 Loc); 7353 7354 // Create the reference to operator=. 7355 ExprResult OpEqualRef 7356 = S.BuildMemberReferenceExpr(To, T, Loc, /*isArrow=*/false, SS, 7357 /*TemplateKWLoc=*/SourceLocation(), 7358 /*FirstQualifierInScope=*/0, 7359 OpLookup, 7360 /*TemplateArgs=*/0, 7361 /*SuppressQualifierCheck=*/true); 7362 if (OpEqualRef.isInvalid()) 7363 return StmtError(); 7364 7365 // Build the call to the assignment operator. 7366 7367 ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 7368 OpEqualRef.takeAs<Expr>(), 7369 Loc, &From, 1, Loc); 7370 if (Call.isInvalid()) 7371 return StmtError(); 7372 7373 return S.Owned(Call.takeAs<Stmt>()); 7374 } 7375 7376 // - if the subobject is of scalar type, the built-in assignment 7377 // operator is used. 7378 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 7379 if (!ArrayTy) { 7380 ExprResult Assignment = S.CreateBuiltinBinOp(Loc, BO_Assign, To, From); 7381 if (Assignment.isInvalid()) 7382 return StmtError(); 7383 7384 return S.Owned(Assignment.takeAs<Stmt>()); 7385 } 7386 7387 // - if the subobject is an array, each element is assigned, in the 7388 // manner appropriate to the element type; 7389 7390 // Construct a loop over the array bounds, e.g., 7391 // 7392 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 7393 // 7394 // that will copy each of the array elements. 7395 QualType SizeType = S.Context.getSizeType(); 7396 7397 // Create the iteration variable. 7398 IdentifierInfo *IterationVarName = 0; 7399 { 7400 SmallString<8> Str; 7401 llvm::raw_svector_ostream OS(Str); 7402 OS << "__i" << Depth; 7403 IterationVarName = &S.Context.Idents.get(OS.str()); 7404 } 7405 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, Loc, 7406 IterationVarName, SizeType, 7407 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 7408 SC_None, SC_None); 7409 7410 // Initialize the iteration variable to zero. 7411 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 7412 IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc)); 7413 7414 // Create a reference to the iteration variable; we'll use this several 7415 // times throughout. 7416 Expr *IterationVarRef 7417 = S.BuildDeclRefExpr(IterationVar, SizeType, VK_LValue, Loc).take(); 7418 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 7419 Expr *IterationVarRefRVal = S.DefaultLvalueConversion(IterationVarRef).take(); 7420 assert(IterationVarRefRVal && "Conversion of invented variable cannot fail!"); 7421 7422 // Create the DeclStmt that holds the iteration variable. 7423 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 7424 7425 // Create the comparison against the array bound. 7426 llvm::APInt Upper 7427 = ArrayTy->getSize().zextOrTrunc(S.Context.getTypeSize(SizeType)); 7428 Expr *Comparison 7429 = new (S.Context) BinaryOperator(IterationVarRefRVal, 7430 IntegerLiteral::Create(S.Context, Upper, SizeType, Loc), 7431 BO_NE, S.Context.BoolTy, 7432 VK_RValue, OK_Ordinary, Loc); 7433 7434 // Create the pre-increment of the iteration variable. 7435 Expr *Increment 7436 = new (S.Context) UnaryOperator(IterationVarRef, UO_PreInc, SizeType, 7437 VK_LValue, OK_Ordinary, Loc); 7438 7439 // Subscript the "from" and "to" expressions with the iteration variable. 7440 From = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(From, Loc, 7441 IterationVarRefRVal, 7442 Loc)); 7443 To = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(To, Loc, 7444 IterationVarRefRVal, 7445 Loc)); 7446 if (!Copying) // Cast to rvalue 7447 From = CastForMoving(S, From); 7448 7449 // Build the copy/move for an individual element of the array. 7450 StmtResult Copy = BuildSingleCopyAssign(S, Loc, ArrayTy->getElementType(), 7451 To, From, CopyingBaseSubobject, 7452 Copying, Depth + 1); 7453 if (Copy.isInvalid()) 7454 return StmtError(); 7455 7456 // Construct the loop that copies all elements of this array. 7457 return S.ActOnForStmt(Loc, Loc, InitStmt, 7458 S.MakeFullExpr(Comparison), 7459 0, S.MakeFullExpr(Increment), 7460 Loc, Copy.take()); 7461} 7462 7463/// Determine whether an implicit copy assignment operator for ClassDecl has a 7464/// const argument. 7465/// FIXME: It ought to be possible to store this on the record. 7466static bool isImplicitCopyAssignmentArgConst(Sema &S, 7467 CXXRecordDecl *ClassDecl) { 7468 if (ClassDecl->isInvalidDecl()) 7469 return true; 7470 7471 // C++ [class.copy]p10: 7472 // If the class definition does not explicitly declare a copy 7473 // assignment operator, one is declared implicitly. 7474 // The implicitly-defined copy assignment operator for a class X 7475 // will have the form 7476 // 7477 // X& X::operator=(const X&) 7478 // 7479 // if 7480 // -- each direct base class B of X has a copy assignment operator 7481 // whose parameter is of type const B&, const volatile B& or B, 7482 // and 7483 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7484 BaseEnd = ClassDecl->bases_end(); 7485 Base != BaseEnd; ++Base) { 7486 // We'll handle this below 7487 if (S.getLangOpts().CPlusPlus0x && Base->isVirtual()) 7488 continue; 7489 7490 assert(!Base->getType()->isDependentType() && 7491 "Cannot generate implicit members for class with dependent bases."); 7492 CXXRecordDecl *BaseClassDecl = Base->getType()->getAsCXXRecordDecl(); 7493 if (!S.LookupCopyingAssignment(BaseClassDecl, Qualifiers::Const, false, 0)) 7494 return false; 7495 } 7496 7497 // In C++11, the above citation has "or virtual" added 7498 if (S.getLangOpts().CPlusPlus0x) { 7499 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7500 BaseEnd = ClassDecl->vbases_end(); 7501 Base != BaseEnd; ++Base) { 7502 assert(!Base->getType()->isDependentType() && 7503 "Cannot generate implicit members for class with dependent bases."); 7504 CXXRecordDecl *BaseClassDecl = Base->getType()->getAsCXXRecordDecl(); 7505 if (!S.LookupCopyingAssignment(BaseClassDecl, Qualifiers::Const, 7506 false, 0)) 7507 return false; 7508 } 7509 } 7510 7511 // -- for all the nonstatic data members of X that are of a class 7512 // type M (or array thereof), each such class type has a copy 7513 // assignment operator whose parameter is of type const M&, 7514 // const volatile M& or M. 7515 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7516 FieldEnd = ClassDecl->field_end(); 7517 Field != FieldEnd; ++Field) { 7518 QualType FieldType = S.Context.getBaseElementType(Field->getType()); 7519 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) 7520 if (!S.LookupCopyingAssignment(FieldClassDecl, Qualifiers::Const, 7521 false, 0)) 7522 return false; 7523 } 7524 7525 // Otherwise, the implicitly declared copy assignment operator will 7526 // have the form 7527 // 7528 // X& X::operator=(X&) 7529 7530 return true; 7531} 7532 7533Sema::ImplicitExceptionSpecification 7534Sema::ComputeDefaultedCopyAssignmentExceptionSpec(CXXMethodDecl *MD) { 7535 CXXRecordDecl *ClassDecl = MD->getParent(); 7536 7537 ImplicitExceptionSpecification ExceptSpec(*this); 7538 if (ClassDecl->isInvalidDecl()) 7539 return ExceptSpec; 7540 7541 const FunctionProtoType *T = MD->getType()->castAs<FunctionProtoType>(); 7542 assert(T->getNumArgs() == 1 && "not a copy assignment op"); 7543 unsigned ArgQuals = T->getArgType(0).getNonReferenceType().getCVRQualifiers(); 7544 7545 // C++ [except.spec]p14: 7546 // An implicitly declared special member function (Clause 12) shall have an 7547 // exception-specification. [...] 7548 7549 // It is unspecified whether or not an implicit copy assignment operator 7550 // attempts to deduplicate calls to assignment operators of virtual bases are 7551 // made. As such, this exception specification is effectively unspecified. 7552 // Based on a similar decision made for constness in C++0x, we're erring on 7553 // the side of assuming such calls to be made regardless of whether they 7554 // actually happen. 7555 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7556 BaseEnd = ClassDecl->bases_end(); 7557 Base != BaseEnd; ++Base) { 7558 if (Base->isVirtual()) 7559 continue; 7560 7561 CXXRecordDecl *BaseClassDecl 7562 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7563 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 7564 ArgQuals, false, 0)) 7565 ExceptSpec.CalledDecl(Base->getLocStart(), CopyAssign); 7566 } 7567 7568 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7569 BaseEnd = ClassDecl->vbases_end(); 7570 Base != BaseEnd; ++Base) { 7571 CXXRecordDecl *BaseClassDecl 7572 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7573 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 7574 ArgQuals, false, 0)) 7575 ExceptSpec.CalledDecl(Base->getLocStart(), CopyAssign); 7576 } 7577 7578 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7579 FieldEnd = ClassDecl->field_end(); 7580 Field != FieldEnd; 7581 ++Field) { 7582 QualType FieldType = Context.getBaseElementType(Field->getType()); 7583 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7584 if (CXXMethodDecl *CopyAssign = 7585 LookupCopyingAssignment(FieldClassDecl, 7586 ArgQuals | FieldType.getCVRQualifiers(), 7587 false, 0)) 7588 ExceptSpec.CalledDecl(Field->getLocation(), CopyAssign); 7589 } 7590 } 7591 7592 return ExceptSpec; 7593} 7594 7595CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 7596 // Note: The following rules are largely analoguous to the copy 7597 // constructor rules. Note that virtual bases are not taken into account 7598 // for determining the argument type of the operator. Note also that 7599 // operators taking an object instead of a reference are allowed. 7600 7601 QualType ArgType = Context.getTypeDeclType(ClassDecl); 7602 QualType RetType = Context.getLValueReferenceType(ArgType); 7603 if (isImplicitCopyAssignmentArgConst(*this, ClassDecl)) 7604 ArgType = ArgType.withConst(); 7605 ArgType = Context.getLValueReferenceType(ArgType); 7606 7607 // An implicitly-declared copy assignment operator is an inline public 7608 // member of its class. 7609 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 7610 SourceLocation ClassLoc = ClassDecl->getLocation(); 7611 DeclarationNameInfo NameInfo(Name, ClassLoc); 7612 CXXMethodDecl *CopyAssignment 7613 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, QualType(), 7614 /*TInfo=*/0, /*isStatic=*/false, 7615 /*StorageClassAsWritten=*/SC_None, 7616 /*isInline=*/true, /*isConstexpr=*/false, 7617 SourceLocation()); 7618 CopyAssignment->setAccess(AS_public); 7619 CopyAssignment->setDefaulted(); 7620 CopyAssignment->setImplicit(); 7621 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 7622 7623 // Build an exception specification pointing back at this member. 7624 FunctionProtoType::ExtProtoInfo EPI; 7625 EPI.ExceptionSpecType = EST_Unevaluated; 7626 EPI.ExceptionSpecDecl = CopyAssignment; 7627 CopyAssignment->setType(Context.getFunctionType(RetType, &ArgType, 1, EPI)); 7628 7629 // Add the parameter to the operator. 7630 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 7631 ClassLoc, ClassLoc, /*Id=*/0, 7632 ArgType, /*TInfo=*/0, 7633 SC_None, 7634 SC_None, 0); 7635 CopyAssignment->setParams(FromParam); 7636 7637 // Note that we have added this copy-assignment operator. 7638 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 7639 7640 if (Scope *S = getScopeForContext(ClassDecl)) 7641 PushOnScopeChains(CopyAssignment, S, false); 7642 ClassDecl->addDecl(CopyAssignment); 7643 7644 // C++0x [class.copy]p19: 7645 // .... If the class definition does not explicitly declare a copy 7646 // assignment operator, there is no user-declared move constructor, and 7647 // there is no user-declared move assignment operator, a copy assignment 7648 // operator is implicitly declared as defaulted. 7649 if (ShouldDeleteSpecialMember(CopyAssignment, CXXCopyAssignment)) 7650 CopyAssignment->setDeletedAsWritten(); 7651 7652 AddOverriddenMethods(ClassDecl, CopyAssignment); 7653 return CopyAssignment; 7654} 7655 7656void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 7657 CXXMethodDecl *CopyAssignOperator) { 7658 assert((CopyAssignOperator->isDefaulted() && 7659 CopyAssignOperator->isOverloadedOperator() && 7660 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 7661 !CopyAssignOperator->doesThisDeclarationHaveABody() && 7662 !CopyAssignOperator->isDeleted()) && 7663 "DefineImplicitCopyAssignment called for wrong function"); 7664 7665 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 7666 7667 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 7668 CopyAssignOperator->setInvalidDecl(); 7669 return; 7670 } 7671 7672 CopyAssignOperator->setUsed(); 7673 7674 ImplicitlyDefinedFunctionScope Scope(*this, CopyAssignOperator); 7675 DiagnosticErrorTrap Trap(Diags); 7676 7677 // C++0x [class.copy]p30: 7678 // The implicitly-defined or explicitly-defaulted copy assignment operator 7679 // for a non-union class X performs memberwise copy assignment of its 7680 // subobjects. The direct base classes of X are assigned first, in the 7681 // order of their declaration in the base-specifier-list, and then the 7682 // immediate non-static data members of X are assigned, in the order in 7683 // which they were declared in the class definition. 7684 7685 // The statements that form the synthesized function body. 7686 SmallVector<Stmt*, 8> Statements; 7687 7688 // The parameter for the "other" object, which we are copying from. 7689 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 7690 Qualifiers OtherQuals = Other->getType().getQualifiers(); 7691 QualType OtherRefType = Other->getType(); 7692 if (const LValueReferenceType *OtherRef 7693 = OtherRefType->getAs<LValueReferenceType>()) { 7694 OtherRefType = OtherRef->getPointeeType(); 7695 OtherQuals = OtherRefType.getQualifiers(); 7696 } 7697 7698 // Our location for everything implicitly-generated. 7699 SourceLocation Loc = CopyAssignOperator->getLocation(); 7700 7701 // Construct a reference to the "other" object. We'll be using this 7702 // throughout the generated ASTs. 7703 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 7704 assert(OtherRef && "Reference to parameter cannot fail!"); 7705 7706 // Construct the "this" pointer. We'll be using this throughout the generated 7707 // ASTs. 7708 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 7709 assert(This && "Reference to this cannot fail!"); 7710 7711 // Assign base classes. 7712 bool Invalid = false; 7713 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7714 E = ClassDecl->bases_end(); Base != E; ++Base) { 7715 // Form the assignment: 7716 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 7717 QualType BaseType = Base->getType().getUnqualifiedType(); 7718 if (!BaseType->isRecordType()) { 7719 Invalid = true; 7720 continue; 7721 } 7722 7723 CXXCastPath BasePath; 7724 BasePath.push_back(Base); 7725 7726 // Construct the "from" expression, which is an implicit cast to the 7727 // appropriately-qualified base type. 7728 Expr *From = OtherRef; 7729 From = ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 7730 CK_UncheckedDerivedToBase, 7731 VK_LValue, &BasePath).take(); 7732 7733 // Dereference "this". 7734 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 7735 7736 // Implicitly cast "this" to the appropriately-qualified base type. 7737 To = ImpCastExprToType(To.take(), 7738 Context.getCVRQualifiedType(BaseType, 7739 CopyAssignOperator->getTypeQualifiers()), 7740 CK_UncheckedDerivedToBase, 7741 VK_LValue, &BasePath); 7742 7743 // Build the copy. 7744 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, BaseType, 7745 To.get(), From, 7746 /*CopyingBaseSubobject=*/true, 7747 /*Copying=*/true); 7748 if (Copy.isInvalid()) { 7749 Diag(CurrentLocation, diag::note_member_synthesized_at) 7750 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7751 CopyAssignOperator->setInvalidDecl(); 7752 return; 7753 } 7754 7755 // Success! Record the copy. 7756 Statements.push_back(Copy.takeAs<Expr>()); 7757 } 7758 7759 // \brief Reference to the __builtin_memcpy function. 7760 Expr *BuiltinMemCpyRef = 0; 7761 // \brief Reference to the __builtin_objc_memmove_collectable function. 7762 Expr *CollectableMemCpyRef = 0; 7763 7764 // Assign non-static members. 7765 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7766 FieldEnd = ClassDecl->field_end(); 7767 Field != FieldEnd; ++Field) { 7768 if (Field->isUnnamedBitfield()) 7769 continue; 7770 7771 // Check for members of reference type; we can't copy those. 7772 if (Field->getType()->isReferenceType()) { 7773 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 7774 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 7775 Diag(Field->getLocation(), diag::note_declared_at); 7776 Diag(CurrentLocation, diag::note_member_synthesized_at) 7777 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7778 Invalid = true; 7779 continue; 7780 } 7781 7782 // Check for members of const-qualified, non-class type. 7783 QualType BaseType = Context.getBaseElementType(Field->getType()); 7784 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 7785 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 7786 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 7787 Diag(Field->getLocation(), diag::note_declared_at); 7788 Diag(CurrentLocation, diag::note_member_synthesized_at) 7789 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7790 Invalid = true; 7791 continue; 7792 } 7793 7794 // Suppress assigning zero-width bitfields. 7795 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0) 7796 continue; 7797 7798 QualType FieldType = Field->getType().getNonReferenceType(); 7799 if (FieldType->isIncompleteArrayType()) { 7800 assert(ClassDecl->hasFlexibleArrayMember() && 7801 "Incomplete array type is not valid"); 7802 continue; 7803 } 7804 7805 // Build references to the field in the object we're copying from and to. 7806 CXXScopeSpec SS; // Intentionally empty 7807 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 7808 LookupMemberName); 7809 MemberLookup.addDecl(*Field); 7810 MemberLookup.resolveKind(); 7811 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 7812 Loc, /*IsArrow=*/false, 7813 SS, SourceLocation(), 0, 7814 MemberLookup, 0); 7815 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 7816 Loc, /*IsArrow=*/true, 7817 SS, SourceLocation(), 0, 7818 MemberLookup, 0); 7819 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 7820 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 7821 7822 // If the field should be copied with __builtin_memcpy rather than via 7823 // explicit assignments, do so. This optimization only applies for arrays 7824 // of scalars and arrays of class type with trivial copy-assignment 7825 // operators. 7826 if (FieldType->isArrayType() && !FieldType.isVolatileQualified() 7827 && BaseType.hasTrivialAssignment(Context, /*Copying=*/true)) { 7828 // Compute the size of the memory buffer to be copied. 7829 QualType SizeType = Context.getSizeType(); 7830 llvm::APInt Size(Context.getTypeSize(SizeType), 7831 Context.getTypeSizeInChars(BaseType).getQuantity()); 7832 for (const ConstantArrayType *Array 7833 = Context.getAsConstantArrayType(FieldType); 7834 Array; 7835 Array = Context.getAsConstantArrayType(Array->getElementType())) { 7836 llvm::APInt ArraySize 7837 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 7838 Size *= ArraySize; 7839 } 7840 7841 // Take the address of the field references for "from" and "to". 7842 From = CreateBuiltinUnaryOp(Loc, UO_AddrOf, From.get()); 7843 To = CreateBuiltinUnaryOp(Loc, UO_AddrOf, To.get()); 7844 7845 bool NeedsCollectableMemCpy = 7846 (BaseType->isRecordType() && 7847 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 7848 7849 if (NeedsCollectableMemCpy) { 7850 if (!CollectableMemCpyRef) { 7851 // Create a reference to the __builtin_objc_memmove_collectable function. 7852 LookupResult R(*this, 7853 &Context.Idents.get("__builtin_objc_memmove_collectable"), 7854 Loc, LookupOrdinaryName); 7855 LookupName(R, TUScope, true); 7856 7857 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 7858 if (!CollectableMemCpy) { 7859 // Something went horribly wrong earlier, and we will have 7860 // complained about it. 7861 Invalid = true; 7862 continue; 7863 } 7864 7865 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 7866 Context.BuiltinFnTy, 7867 VK_RValue, Loc, 0).take(); 7868 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 7869 } 7870 } 7871 // Create a reference to the __builtin_memcpy builtin function. 7872 else if (!BuiltinMemCpyRef) { 7873 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 7874 LookupOrdinaryName); 7875 LookupName(R, TUScope, true); 7876 7877 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 7878 if (!BuiltinMemCpy) { 7879 // Something went horribly wrong earlier, and we will have complained 7880 // about it. 7881 Invalid = true; 7882 continue; 7883 } 7884 7885 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 7886 Context.BuiltinFnTy, 7887 VK_RValue, Loc, 0).take(); 7888 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 7889 } 7890 7891 SmallVector<Expr*, 8> CallArgs; 7892 CallArgs.push_back(To.takeAs<Expr>()); 7893 CallArgs.push_back(From.takeAs<Expr>()); 7894 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 7895 ExprResult Call = ExprError(); 7896 if (NeedsCollectableMemCpy) 7897 Call = ActOnCallExpr(/*Scope=*/0, 7898 CollectableMemCpyRef, 7899 Loc, CallArgs, 7900 Loc); 7901 else 7902 Call = ActOnCallExpr(/*Scope=*/0, 7903 BuiltinMemCpyRef, 7904 Loc, CallArgs, 7905 Loc); 7906 7907 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 7908 Statements.push_back(Call.takeAs<Expr>()); 7909 continue; 7910 } 7911 7912 // Build the copy of this field. 7913 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, FieldType, 7914 To.get(), From.get(), 7915 /*CopyingBaseSubobject=*/false, 7916 /*Copying=*/true); 7917 if (Copy.isInvalid()) { 7918 Diag(CurrentLocation, diag::note_member_synthesized_at) 7919 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7920 CopyAssignOperator->setInvalidDecl(); 7921 return; 7922 } 7923 7924 // Success! Record the copy. 7925 Statements.push_back(Copy.takeAs<Stmt>()); 7926 } 7927 7928 if (!Invalid) { 7929 // Add a "return *this;" 7930 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 7931 7932 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 7933 if (Return.isInvalid()) 7934 Invalid = true; 7935 else { 7936 Statements.push_back(Return.takeAs<Stmt>()); 7937 7938 if (Trap.hasErrorOccurred()) { 7939 Diag(CurrentLocation, diag::note_member_synthesized_at) 7940 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7941 Invalid = true; 7942 } 7943 } 7944 } 7945 7946 if (Invalid) { 7947 CopyAssignOperator->setInvalidDecl(); 7948 return; 7949 } 7950 7951 StmtResult Body; 7952 { 7953 CompoundScopeRAII CompoundScope(*this); 7954 Body = ActOnCompoundStmt(Loc, Loc, Statements, 7955 /*isStmtExpr=*/false); 7956 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 7957 } 7958 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 7959 7960 if (ASTMutationListener *L = getASTMutationListener()) { 7961 L->CompletedImplicitDefinition(CopyAssignOperator); 7962 } 7963} 7964 7965Sema::ImplicitExceptionSpecification 7966Sema::ComputeDefaultedMoveAssignmentExceptionSpec(CXXMethodDecl *MD) { 7967 CXXRecordDecl *ClassDecl = MD->getParent(); 7968 7969 ImplicitExceptionSpecification ExceptSpec(*this); 7970 if (ClassDecl->isInvalidDecl()) 7971 return ExceptSpec; 7972 7973 // C++0x [except.spec]p14: 7974 // An implicitly declared special member function (Clause 12) shall have an 7975 // exception-specification. [...] 7976 7977 // It is unspecified whether or not an implicit move assignment operator 7978 // attempts to deduplicate calls to assignment operators of virtual bases are 7979 // made. As such, this exception specification is effectively unspecified. 7980 // Based on a similar decision made for constness in C++0x, we're erring on 7981 // the side of assuming such calls to be made regardless of whether they 7982 // actually happen. 7983 // Note that a move constructor is not implicitly declared when there are 7984 // virtual bases, but it can still be user-declared and explicitly defaulted. 7985 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7986 BaseEnd = ClassDecl->bases_end(); 7987 Base != BaseEnd; ++Base) { 7988 if (Base->isVirtual()) 7989 continue; 7990 7991 CXXRecordDecl *BaseClassDecl 7992 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7993 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 7994 0, false, 0)) 7995 ExceptSpec.CalledDecl(Base->getLocStart(), MoveAssign); 7996 } 7997 7998 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7999 BaseEnd = ClassDecl->vbases_end(); 8000 Base != BaseEnd; ++Base) { 8001 CXXRecordDecl *BaseClassDecl 8002 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8003 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 8004 0, false, 0)) 8005 ExceptSpec.CalledDecl(Base->getLocStart(), MoveAssign); 8006 } 8007 8008 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8009 FieldEnd = ClassDecl->field_end(); 8010 Field != FieldEnd; 8011 ++Field) { 8012 QualType FieldType = Context.getBaseElementType(Field->getType()); 8013 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8014 if (CXXMethodDecl *MoveAssign = 8015 LookupMovingAssignment(FieldClassDecl, 8016 FieldType.getCVRQualifiers(), 8017 false, 0)) 8018 ExceptSpec.CalledDecl(Field->getLocation(), MoveAssign); 8019 } 8020 } 8021 8022 return ExceptSpec; 8023} 8024 8025/// Determine whether the class type has any direct or indirect virtual base 8026/// classes which have a non-trivial move assignment operator. 8027static bool 8028hasVirtualBaseWithNonTrivialMoveAssignment(Sema &S, CXXRecordDecl *ClassDecl) { 8029 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8030 BaseEnd = ClassDecl->vbases_end(); 8031 Base != BaseEnd; ++Base) { 8032 CXXRecordDecl *BaseClass = 8033 cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8034 8035 // Try to declare the move assignment. If it would be deleted, then the 8036 // class does not have a non-trivial move assignment. 8037 if (BaseClass->needsImplicitMoveAssignment()) 8038 S.DeclareImplicitMoveAssignment(BaseClass); 8039 8040 // If the class has both a trivial move assignment and a non-trivial move 8041 // assignment, hasTrivialMoveAssignment() is false. 8042 if (BaseClass->hasDeclaredMoveAssignment() && 8043 !BaseClass->hasTrivialMoveAssignment()) 8044 return true; 8045 } 8046 8047 return false; 8048} 8049 8050/// Determine whether the given type either has a move constructor or is 8051/// trivially copyable. 8052static bool 8053hasMoveOrIsTriviallyCopyable(Sema &S, QualType Type, bool IsConstructor) { 8054 Type = S.Context.getBaseElementType(Type); 8055 8056 // FIXME: Technically, non-trivially-copyable non-class types, such as 8057 // reference types, are supposed to return false here, but that appears 8058 // to be a standard defect. 8059 CXXRecordDecl *ClassDecl = Type->getAsCXXRecordDecl(); 8060 if (!ClassDecl || !ClassDecl->getDefinition()) 8061 return true; 8062 8063 if (Type.isTriviallyCopyableType(S.Context)) 8064 return true; 8065 8066 if (IsConstructor) { 8067 if (ClassDecl->needsImplicitMoveConstructor()) 8068 S.DeclareImplicitMoveConstructor(ClassDecl); 8069 return ClassDecl->hasDeclaredMoveConstructor(); 8070 } 8071 8072 if (ClassDecl->needsImplicitMoveAssignment()) 8073 S.DeclareImplicitMoveAssignment(ClassDecl); 8074 return ClassDecl->hasDeclaredMoveAssignment(); 8075} 8076 8077/// Determine whether all non-static data members and direct or virtual bases 8078/// of class \p ClassDecl have either a move operation, or are trivially 8079/// copyable. 8080static bool subobjectsHaveMoveOrTrivialCopy(Sema &S, CXXRecordDecl *ClassDecl, 8081 bool IsConstructor) { 8082 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8083 BaseEnd = ClassDecl->bases_end(); 8084 Base != BaseEnd; ++Base) { 8085 if (Base->isVirtual()) 8086 continue; 8087 8088 if (!hasMoveOrIsTriviallyCopyable(S, Base->getType(), IsConstructor)) 8089 return false; 8090 } 8091 8092 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8093 BaseEnd = ClassDecl->vbases_end(); 8094 Base != BaseEnd; ++Base) { 8095 if (!hasMoveOrIsTriviallyCopyable(S, Base->getType(), IsConstructor)) 8096 return false; 8097 } 8098 8099 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8100 FieldEnd = ClassDecl->field_end(); 8101 Field != FieldEnd; ++Field) { 8102 if (!hasMoveOrIsTriviallyCopyable(S, Field->getType(), IsConstructor)) 8103 return false; 8104 } 8105 8106 return true; 8107} 8108 8109CXXMethodDecl *Sema::DeclareImplicitMoveAssignment(CXXRecordDecl *ClassDecl) { 8110 // C++11 [class.copy]p20: 8111 // If the definition of a class X does not explicitly declare a move 8112 // assignment operator, one will be implicitly declared as defaulted 8113 // if and only if: 8114 // 8115 // - [first 4 bullets] 8116 assert(ClassDecl->needsImplicitMoveAssignment()); 8117 8118 // [Checked after we build the declaration] 8119 // - the move assignment operator would not be implicitly defined as 8120 // deleted, 8121 8122 // [DR1402]: 8123 // - X has no direct or indirect virtual base class with a non-trivial 8124 // move assignment operator, and 8125 // - each of X's non-static data members and direct or virtual base classes 8126 // has a type that either has a move assignment operator or is trivially 8127 // copyable. 8128 if (hasVirtualBaseWithNonTrivialMoveAssignment(*this, ClassDecl) || 8129 !subobjectsHaveMoveOrTrivialCopy(*this, ClassDecl,/*Constructor*/false)) { 8130 ClassDecl->setFailedImplicitMoveAssignment(); 8131 return 0; 8132 } 8133 8134 // Note: The following rules are largely analoguous to the move 8135 // constructor rules. 8136 8137 QualType ArgType = Context.getTypeDeclType(ClassDecl); 8138 QualType RetType = Context.getLValueReferenceType(ArgType); 8139 ArgType = Context.getRValueReferenceType(ArgType); 8140 8141 // An implicitly-declared move assignment operator is an inline public 8142 // member of its class. 8143 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 8144 SourceLocation ClassLoc = ClassDecl->getLocation(); 8145 DeclarationNameInfo NameInfo(Name, ClassLoc); 8146 CXXMethodDecl *MoveAssignment 8147 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, QualType(), 8148 /*TInfo=*/0, /*isStatic=*/false, 8149 /*StorageClassAsWritten=*/SC_None, 8150 /*isInline=*/true, 8151 /*isConstexpr=*/false, 8152 SourceLocation()); 8153 MoveAssignment->setAccess(AS_public); 8154 MoveAssignment->setDefaulted(); 8155 MoveAssignment->setImplicit(); 8156 MoveAssignment->setTrivial(ClassDecl->hasTrivialMoveAssignment()); 8157 8158 // Build an exception specification pointing back at this member. 8159 FunctionProtoType::ExtProtoInfo EPI; 8160 EPI.ExceptionSpecType = EST_Unevaluated; 8161 EPI.ExceptionSpecDecl = MoveAssignment; 8162 MoveAssignment->setType(Context.getFunctionType(RetType, &ArgType, 1, EPI)); 8163 8164 // Add the parameter to the operator. 8165 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveAssignment, 8166 ClassLoc, ClassLoc, /*Id=*/0, 8167 ArgType, /*TInfo=*/0, 8168 SC_None, 8169 SC_None, 0); 8170 MoveAssignment->setParams(FromParam); 8171 8172 // Note that we have added this copy-assignment operator. 8173 ++ASTContext::NumImplicitMoveAssignmentOperatorsDeclared; 8174 8175 // C++0x [class.copy]p9: 8176 // If the definition of a class X does not explicitly declare a move 8177 // assignment operator, one will be implicitly declared as defaulted if and 8178 // only if: 8179 // [...] 8180 // - the move assignment operator would not be implicitly defined as 8181 // deleted. 8182 if (ShouldDeleteSpecialMember(MoveAssignment, CXXMoveAssignment)) { 8183 // Cache this result so that we don't try to generate this over and over 8184 // on every lookup, leaking memory and wasting time. 8185 ClassDecl->setFailedImplicitMoveAssignment(); 8186 return 0; 8187 } 8188 8189 if (Scope *S = getScopeForContext(ClassDecl)) 8190 PushOnScopeChains(MoveAssignment, S, false); 8191 ClassDecl->addDecl(MoveAssignment); 8192 8193 AddOverriddenMethods(ClassDecl, MoveAssignment); 8194 return MoveAssignment; 8195} 8196 8197void Sema::DefineImplicitMoveAssignment(SourceLocation CurrentLocation, 8198 CXXMethodDecl *MoveAssignOperator) { 8199 assert((MoveAssignOperator->isDefaulted() && 8200 MoveAssignOperator->isOverloadedOperator() && 8201 MoveAssignOperator->getOverloadedOperator() == OO_Equal && 8202 !MoveAssignOperator->doesThisDeclarationHaveABody() && 8203 !MoveAssignOperator->isDeleted()) && 8204 "DefineImplicitMoveAssignment called for wrong function"); 8205 8206 CXXRecordDecl *ClassDecl = MoveAssignOperator->getParent(); 8207 8208 if (ClassDecl->isInvalidDecl() || MoveAssignOperator->isInvalidDecl()) { 8209 MoveAssignOperator->setInvalidDecl(); 8210 return; 8211 } 8212 8213 MoveAssignOperator->setUsed(); 8214 8215 ImplicitlyDefinedFunctionScope Scope(*this, MoveAssignOperator); 8216 DiagnosticErrorTrap Trap(Diags); 8217 8218 // C++0x [class.copy]p28: 8219 // The implicitly-defined or move assignment operator for a non-union class 8220 // X performs memberwise move assignment of its subobjects. The direct base 8221 // classes of X are assigned first, in the order of their declaration in the 8222 // base-specifier-list, and then the immediate non-static data members of X 8223 // are assigned, in the order in which they were declared in the class 8224 // definition. 8225 8226 // The statements that form the synthesized function body. 8227 SmallVector<Stmt*, 8> Statements; 8228 8229 // The parameter for the "other" object, which we are move from. 8230 ParmVarDecl *Other = MoveAssignOperator->getParamDecl(0); 8231 QualType OtherRefType = Other->getType()-> 8232 getAs<RValueReferenceType>()->getPointeeType(); 8233 assert(OtherRefType.getQualifiers() == 0 && 8234 "Bad argument type of defaulted move assignment"); 8235 8236 // Our location for everything implicitly-generated. 8237 SourceLocation Loc = MoveAssignOperator->getLocation(); 8238 8239 // Construct a reference to the "other" object. We'll be using this 8240 // throughout the generated ASTs. 8241 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 8242 assert(OtherRef && "Reference to parameter cannot fail!"); 8243 // Cast to rvalue. 8244 OtherRef = CastForMoving(*this, OtherRef); 8245 8246 // Construct the "this" pointer. We'll be using this throughout the generated 8247 // ASTs. 8248 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 8249 assert(This && "Reference to this cannot fail!"); 8250 8251 // Assign base classes. 8252 bool Invalid = false; 8253 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8254 E = ClassDecl->bases_end(); Base != E; ++Base) { 8255 // Form the assignment: 8256 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&&>(other)); 8257 QualType BaseType = Base->getType().getUnqualifiedType(); 8258 if (!BaseType->isRecordType()) { 8259 Invalid = true; 8260 continue; 8261 } 8262 8263 CXXCastPath BasePath; 8264 BasePath.push_back(Base); 8265 8266 // Construct the "from" expression, which is an implicit cast to the 8267 // appropriately-qualified base type. 8268 Expr *From = OtherRef; 8269 From = ImpCastExprToType(From, BaseType, CK_UncheckedDerivedToBase, 8270 VK_XValue, &BasePath).take(); 8271 8272 // Dereference "this". 8273 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8274 8275 // Implicitly cast "this" to the appropriately-qualified base type. 8276 To = ImpCastExprToType(To.take(), 8277 Context.getCVRQualifiedType(BaseType, 8278 MoveAssignOperator->getTypeQualifiers()), 8279 CK_UncheckedDerivedToBase, 8280 VK_LValue, &BasePath); 8281 8282 // Build the move. 8283 StmtResult Move = BuildSingleCopyAssign(*this, Loc, BaseType, 8284 To.get(), From, 8285 /*CopyingBaseSubobject=*/true, 8286 /*Copying=*/false); 8287 if (Move.isInvalid()) { 8288 Diag(CurrentLocation, diag::note_member_synthesized_at) 8289 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8290 MoveAssignOperator->setInvalidDecl(); 8291 return; 8292 } 8293 8294 // Success! Record the move. 8295 Statements.push_back(Move.takeAs<Expr>()); 8296 } 8297 8298 // \brief Reference to the __builtin_memcpy function. 8299 Expr *BuiltinMemCpyRef = 0; 8300 // \brief Reference to the __builtin_objc_memmove_collectable function. 8301 Expr *CollectableMemCpyRef = 0; 8302 8303 // Assign non-static members. 8304 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8305 FieldEnd = ClassDecl->field_end(); 8306 Field != FieldEnd; ++Field) { 8307 if (Field->isUnnamedBitfield()) 8308 continue; 8309 8310 // Check for members of reference type; we can't move those. 8311 if (Field->getType()->isReferenceType()) { 8312 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8313 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 8314 Diag(Field->getLocation(), diag::note_declared_at); 8315 Diag(CurrentLocation, diag::note_member_synthesized_at) 8316 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8317 Invalid = true; 8318 continue; 8319 } 8320 8321 // Check for members of const-qualified, non-class type. 8322 QualType BaseType = Context.getBaseElementType(Field->getType()); 8323 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 8324 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8325 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 8326 Diag(Field->getLocation(), diag::note_declared_at); 8327 Diag(CurrentLocation, diag::note_member_synthesized_at) 8328 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8329 Invalid = true; 8330 continue; 8331 } 8332 8333 // Suppress assigning zero-width bitfields. 8334 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0) 8335 continue; 8336 8337 QualType FieldType = Field->getType().getNonReferenceType(); 8338 if (FieldType->isIncompleteArrayType()) { 8339 assert(ClassDecl->hasFlexibleArrayMember() && 8340 "Incomplete array type is not valid"); 8341 continue; 8342 } 8343 8344 // Build references to the field in the object we're copying from and to. 8345 CXXScopeSpec SS; // Intentionally empty 8346 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 8347 LookupMemberName); 8348 MemberLookup.addDecl(*Field); 8349 MemberLookup.resolveKind(); 8350 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 8351 Loc, /*IsArrow=*/false, 8352 SS, SourceLocation(), 0, 8353 MemberLookup, 0); 8354 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 8355 Loc, /*IsArrow=*/true, 8356 SS, SourceLocation(), 0, 8357 MemberLookup, 0); 8358 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 8359 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 8360 8361 assert(!From.get()->isLValue() && // could be xvalue or prvalue 8362 "Member reference with rvalue base must be rvalue except for reference " 8363 "members, which aren't allowed for move assignment."); 8364 8365 // If the field should be copied with __builtin_memcpy rather than via 8366 // explicit assignments, do so. This optimization only applies for arrays 8367 // of scalars and arrays of class type with trivial move-assignment 8368 // operators. 8369 if (FieldType->isArrayType() && !FieldType.isVolatileQualified() 8370 && BaseType.hasTrivialAssignment(Context, /*Copying=*/false)) { 8371 // Compute the size of the memory buffer to be copied. 8372 QualType SizeType = Context.getSizeType(); 8373 llvm::APInt Size(Context.getTypeSize(SizeType), 8374 Context.getTypeSizeInChars(BaseType).getQuantity()); 8375 for (const ConstantArrayType *Array 8376 = Context.getAsConstantArrayType(FieldType); 8377 Array; 8378 Array = Context.getAsConstantArrayType(Array->getElementType())) { 8379 llvm::APInt ArraySize 8380 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 8381 Size *= ArraySize; 8382 } 8383 8384 // Take the address of the field references for "from" and "to". We 8385 // directly construct UnaryOperators here because semantic analysis 8386 // does not permit us to take the address of an xvalue. 8387 From = new (Context) UnaryOperator(From.get(), UO_AddrOf, 8388 Context.getPointerType(From.get()->getType()), 8389 VK_RValue, OK_Ordinary, Loc); 8390 To = new (Context) UnaryOperator(To.get(), UO_AddrOf, 8391 Context.getPointerType(To.get()->getType()), 8392 VK_RValue, OK_Ordinary, Loc); 8393 8394 bool NeedsCollectableMemCpy = 8395 (BaseType->isRecordType() && 8396 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 8397 8398 if (NeedsCollectableMemCpy) { 8399 if (!CollectableMemCpyRef) { 8400 // Create a reference to the __builtin_objc_memmove_collectable function. 8401 LookupResult R(*this, 8402 &Context.Idents.get("__builtin_objc_memmove_collectable"), 8403 Loc, LookupOrdinaryName); 8404 LookupName(R, TUScope, true); 8405 8406 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 8407 if (!CollectableMemCpy) { 8408 // Something went horribly wrong earlier, and we will have 8409 // complained about it. 8410 Invalid = true; 8411 continue; 8412 } 8413 8414 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 8415 Context.BuiltinFnTy, 8416 VK_RValue, Loc, 0).take(); 8417 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 8418 } 8419 } 8420 // Create a reference to the __builtin_memcpy builtin function. 8421 else if (!BuiltinMemCpyRef) { 8422 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 8423 LookupOrdinaryName); 8424 LookupName(R, TUScope, true); 8425 8426 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 8427 if (!BuiltinMemCpy) { 8428 // Something went horribly wrong earlier, and we will have complained 8429 // about it. 8430 Invalid = true; 8431 continue; 8432 } 8433 8434 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 8435 Context.BuiltinFnTy, 8436 VK_RValue, Loc, 0).take(); 8437 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 8438 } 8439 8440 SmallVector<Expr*, 8> CallArgs; 8441 CallArgs.push_back(To.takeAs<Expr>()); 8442 CallArgs.push_back(From.takeAs<Expr>()); 8443 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 8444 ExprResult Call = ExprError(); 8445 if (NeedsCollectableMemCpy) 8446 Call = ActOnCallExpr(/*Scope=*/0, 8447 CollectableMemCpyRef, 8448 Loc, CallArgs, 8449 Loc); 8450 else 8451 Call = ActOnCallExpr(/*Scope=*/0, 8452 BuiltinMemCpyRef, 8453 Loc, CallArgs, 8454 Loc); 8455 8456 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 8457 Statements.push_back(Call.takeAs<Expr>()); 8458 continue; 8459 } 8460 8461 // Build the move of this field. 8462 StmtResult Move = BuildSingleCopyAssign(*this, Loc, FieldType, 8463 To.get(), From.get(), 8464 /*CopyingBaseSubobject=*/false, 8465 /*Copying=*/false); 8466 if (Move.isInvalid()) { 8467 Diag(CurrentLocation, diag::note_member_synthesized_at) 8468 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8469 MoveAssignOperator->setInvalidDecl(); 8470 return; 8471 } 8472 8473 // Success! Record the copy. 8474 Statements.push_back(Move.takeAs<Stmt>()); 8475 } 8476 8477 if (!Invalid) { 8478 // Add a "return *this;" 8479 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8480 8481 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 8482 if (Return.isInvalid()) 8483 Invalid = true; 8484 else { 8485 Statements.push_back(Return.takeAs<Stmt>()); 8486 8487 if (Trap.hasErrorOccurred()) { 8488 Diag(CurrentLocation, diag::note_member_synthesized_at) 8489 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8490 Invalid = true; 8491 } 8492 } 8493 } 8494 8495 if (Invalid) { 8496 MoveAssignOperator->setInvalidDecl(); 8497 return; 8498 } 8499 8500 StmtResult Body; 8501 { 8502 CompoundScopeRAII CompoundScope(*this); 8503 Body = ActOnCompoundStmt(Loc, Loc, Statements, 8504 /*isStmtExpr=*/false); 8505 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 8506 } 8507 MoveAssignOperator->setBody(Body.takeAs<Stmt>()); 8508 8509 if (ASTMutationListener *L = getASTMutationListener()) { 8510 L->CompletedImplicitDefinition(MoveAssignOperator); 8511 } 8512} 8513 8514/// Determine whether an implicit copy constructor for ClassDecl has a const 8515/// argument. 8516/// FIXME: It ought to be possible to store this on the record. 8517static bool isImplicitCopyCtorArgConst(Sema &S, CXXRecordDecl *ClassDecl) { 8518 if (ClassDecl->isInvalidDecl()) 8519 return true; 8520 8521 // C++ [class.copy]p5: 8522 // The implicitly-declared copy constructor for a class X will 8523 // have the form 8524 // 8525 // X::X(const X&) 8526 // 8527 // if 8528 // -- each direct or virtual base class B of X has a copy 8529 // constructor whose first parameter is of type const B& or 8530 // const volatile B&, and 8531 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8532 BaseEnd = ClassDecl->bases_end(); 8533 Base != BaseEnd; ++Base) { 8534 // Virtual bases are handled below. 8535 if (Base->isVirtual()) 8536 continue; 8537 8538 CXXRecordDecl *BaseClassDecl 8539 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8540 // FIXME: This lookup is wrong. If the copy ctor for a member or base is 8541 // ambiguous, we should still produce a constructor with a const-qualified 8542 // parameter. 8543 if (!S.LookupCopyingConstructor(BaseClassDecl, Qualifiers::Const)) 8544 return false; 8545 } 8546 8547 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8548 BaseEnd = ClassDecl->vbases_end(); 8549 Base != BaseEnd; ++Base) { 8550 CXXRecordDecl *BaseClassDecl 8551 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8552 if (!S.LookupCopyingConstructor(BaseClassDecl, Qualifiers::Const)) 8553 return false; 8554 } 8555 8556 // -- for all the nonstatic data members of X that are of a 8557 // class type M (or array thereof), each such class type 8558 // has a copy constructor whose first parameter is of type 8559 // const M& or const volatile M&. 8560 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8561 FieldEnd = ClassDecl->field_end(); 8562 Field != FieldEnd; ++Field) { 8563 QualType FieldType = S.Context.getBaseElementType(Field->getType()); 8564 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8565 if (!S.LookupCopyingConstructor(FieldClassDecl, Qualifiers::Const)) 8566 return false; 8567 } 8568 } 8569 8570 // Otherwise, the implicitly declared copy constructor will have 8571 // the form 8572 // 8573 // X::X(X&) 8574 8575 return true; 8576} 8577 8578Sema::ImplicitExceptionSpecification 8579Sema::ComputeDefaultedCopyCtorExceptionSpec(CXXMethodDecl *MD) { 8580 CXXRecordDecl *ClassDecl = MD->getParent(); 8581 8582 ImplicitExceptionSpecification ExceptSpec(*this); 8583 if (ClassDecl->isInvalidDecl()) 8584 return ExceptSpec; 8585 8586 const FunctionProtoType *T = MD->getType()->castAs<FunctionProtoType>(); 8587 assert(T->getNumArgs() >= 1 && "not a copy ctor"); 8588 unsigned Quals = T->getArgType(0).getNonReferenceType().getCVRQualifiers(); 8589 8590 // C++ [except.spec]p14: 8591 // An implicitly declared special member function (Clause 12) shall have an 8592 // exception-specification. [...] 8593 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8594 BaseEnd = ClassDecl->bases_end(); 8595 Base != BaseEnd; 8596 ++Base) { 8597 // Virtual bases are handled below. 8598 if (Base->isVirtual()) 8599 continue; 8600 8601 CXXRecordDecl *BaseClassDecl 8602 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8603 if (CXXConstructorDecl *CopyConstructor = 8604 LookupCopyingConstructor(BaseClassDecl, Quals)) 8605 ExceptSpec.CalledDecl(Base->getLocStart(), CopyConstructor); 8606 } 8607 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8608 BaseEnd = ClassDecl->vbases_end(); 8609 Base != BaseEnd; 8610 ++Base) { 8611 CXXRecordDecl *BaseClassDecl 8612 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8613 if (CXXConstructorDecl *CopyConstructor = 8614 LookupCopyingConstructor(BaseClassDecl, Quals)) 8615 ExceptSpec.CalledDecl(Base->getLocStart(), CopyConstructor); 8616 } 8617 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8618 FieldEnd = ClassDecl->field_end(); 8619 Field != FieldEnd; 8620 ++Field) { 8621 QualType FieldType = Context.getBaseElementType(Field->getType()); 8622 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8623 if (CXXConstructorDecl *CopyConstructor = 8624 LookupCopyingConstructor(FieldClassDecl, 8625 Quals | FieldType.getCVRQualifiers())) 8626 ExceptSpec.CalledDecl(Field->getLocation(), CopyConstructor); 8627 } 8628 } 8629 8630 return ExceptSpec; 8631} 8632 8633CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 8634 CXXRecordDecl *ClassDecl) { 8635 // C++ [class.copy]p4: 8636 // If the class definition does not explicitly declare a copy 8637 // constructor, one is declared implicitly. 8638 8639 QualType ClassType = Context.getTypeDeclType(ClassDecl); 8640 QualType ArgType = ClassType; 8641 bool Const = isImplicitCopyCtorArgConst(*this, ClassDecl); 8642 if (Const) 8643 ArgType = ArgType.withConst(); 8644 ArgType = Context.getLValueReferenceType(ArgType); 8645 8646 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, 8647 CXXCopyConstructor, 8648 Const); 8649 8650 DeclarationName Name 8651 = Context.DeclarationNames.getCXXConstructorName( 8652 Context.getCanonicalType(ClassType)); 8653 SourceLocation ClassLoc = ClassDecl->getLocation(); 8654 DeclarationNameInfo NameInfo(Name, ClassLoc); 8655 8656 // An implicitly-declared copy constructor is an inline public 8657 // member of its class. 8658 CXXConstructorDecl *CopyConstructor = CXXConstructorDecl::Create( 8659 Context, ClassDecl, ClassLoc, NameInfo, QualType(), /*TInfo=*/0, 8660 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 8661 Constexpr); 8662 CopyConstructor->setAccess(AS_public); 8663 CopyConstructor->setDefaulted(); 8664 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 8665 8666 // Build an exception specification pointing back at this member. 8667 FunctionProtoType::ExtProtoInfo EPI; 8668 EPI.ExceptionSpecType = EST_Unevaluated; 8669 EPI.ExceptionSpecDecl = CopyConstructor; 8670 CopyConstructor->setType( 8671 Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI)); 8672 8673 // Note that we have declared this constructor. 8674 ++ASTContext::NumImplicitCopyConstructorsDeclared; 8675 8676 // Add the parameter to the constructor. 8677 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 8678 ClassLoc, ClassLoc, 8679 /*IdentifierInfo=*/0, 8680 ArgType, /*TInfo=*/0, 8681 SC_None, 8682 SC_None, 0); 8683 CopyConstructor->setParams(FromParam); 8684 8685 if (Scope *S = getScopeForContext(ClassDecl)) 8686 PushOnScopeChains(CopyConstructor, S, false); 8687 ClassDecl->addDecl(CopyConstructor); 8688 8689 // C++11 [class.copy]p8: 8690 // ... If the class definition does not explicitly declare a copy 8691 // constructor, there is no user-declared move constructor, and there is no 8692 // user-declared move assignment operator, a copy constructor is implicitly 8693 // declared as defaulted. 8694 if (ShouldDeleteSpecialMember(CopyConstructor, CXXCopyConstructor)) 8695 CopyConstructor->setDeletedAsWritten(); 8696 8697 return CopyConstructor; 8698} 8699 8700void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 8701 CXXConstructorDecl *CopyConstructor) { 8702 assert((CopyConstructor->isDefaulted() && 8703 CopyConstructor->isCopyConstructor() && 8704 !CopyConstructor->doesThisDeclarationHaveABody() && 8705 !CopyConstructor->isDeleted()) && 8706 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 8707 8708 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 8709 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 8710 8711 ImplicitlyDefinedFunctionScope Scope(*this, CopyConstructor); 8712 DiagnosticErrorTrap Trap(Diags); 8713 8714 if (SetCtorInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) || 8715 Trap.hasErrorOccurred()) { 8716 Diag(CurrentLocation, diag::note_member_synthesized_at) 8717 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 8718 CopyConstructor->setInvalidDecl(); 8719 } else { 8720 Sema::CompoundScopeRAII CompoundScope(*this); 8721 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 8722 CopyConstructor->getLocation(), 8723 MultiStmtArg(), 8724 /*isStmtExpr=*/false) 8725 .takeAs<Stmt>()); 8726 CopyConstructor->setImplicitlyDefined(true); 8727 } 8728 8729 CopyConstructor->setUsed(); 8730 if (ASTMutationListener *L = getASTMutationListener()) { 8731 L->CompletedImplicitDefinition(CopyConstructor); 8732 } 8733} 8734 8735Sema::ImplicitExceptionSpecification 8736Sema::ComputeDefaultedMoveCtorExceptionSpec(CXXMethodDecl *MD) { 8737 CXXRecordDecl *ClassDecl = MD->getParent(); 8738 8739 // C++ [except.spec]p14: 8740 // An implicitly declared special member function (Clause 12) shall have an 8741 // exception-specification. [...] 8742 ImplicitExceptionSpecification ExceptSpec(*this); 8743 if (ClassDecl->isInvalidDecl()) 8744 return ExceptSpec; 8745 8746 // Direct base-class constructors. 8747 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 8748 BEnd = ClassDecl->bases_end(); 8749 B != BEnd; ++B) { 8750 if (B->isVirtual()) // Handled below. 8751 continue; 8752 8753 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 8754 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 8755 CXXConstructorDecl *Constructor = 8756 LookupMovingConstructor(BaseClassDecl, 0); 8757 // If this is a deleted function, add it anyway. This might be conformant 8758 // with the standard. This might not. I'm not sure. It might not matter. 8759 if (Constructor) 8760 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 8761 } 8762 } 8763 8764 // Virtual base-class constructors. 8765 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 8766 BEnd = ClassDecl->vbases_end(); 8767 B != BEnd; ++B) { 8768 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 8769 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 8770 CXXConstructorDecl *Constructor = 8771 LookupMovingConstructor(BaseClassDecl, 0); 8772 // If this is a deleted function, add it anyway. This might be conformant 8773 // with the standard. This might not. I'm not sure. It might not matter. 8774 if (Constructor) 8775 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 8776 } 8777 } 8778 8779 // Field constructors. 8780 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 8781 FEnd = ClassDecl->field_end(); 8782 F != FEnd; ++F) { 8783 QualType FieldType = Context.getBaseElementType(F->getType()); 8784 if (CXXRecordDecl *FieldRecDecl = FieldType->getAsCXXRecordDecl()) { 8785 CXXConstructorDecl *Constructor = 8786 LookupMovingConstructor(FieldRecDecl, FieldType.getCVRQualifiers()); 8787 // If this is a deleted function, add it anyway. This might be conformant 8788 // with the standard. This might not. I'm not sure. It might not matter. 8789 // In particular, the problem is that this function never gets called. It 8790 // might just be ill-formed because this function attempts to refer to 8791 // a deleted function here. 8792 if (Constructor) 8793 ExceptSpec.CalledDecl(F->getLocation(), Constructor); 8794 } 8795 } 8796 8797 return ExceptSpec; 8798} 8799 8800CXXConstructorDecl *Sema::DeclareImplicitMoveConstructor( 8801 CXXRecordDecl *ClassDecl) { 8802 // C++11 [class.copy]p9: 8803 // If the definition of a class X does not explicitly declare a move 8804 // constructor, one will be implicitly declared as defaulted if and only if: 8805 // 8806 // - [first 4 bullets] 8807 assert(ClassDecl->needsImplicitMoveConstructor()); 8808 8809 // [Checked after we build the declaration] 8810 // - the move assignment operator would not be implicitly defined as 8811 // deleted, 8812 8813 // [DR1402]: 8814 // - each of X's non-static data members and direct or virtual base classes 8815 // has a type that either has a move constructor or is trivially copyable. 8816 if (!subobjectsHaveMoveOrTrivialCopy(*this, ClassDecl, /*Constructor*/true)) { 8817 ClassDecl->setFailedImplicitMoveConstructor(); 8818 return 0; 8819 } 8820 8821 QualType ClassType = Context.getTypeDeclType(ClassDecl); 8822 QualType ArgType = Context.getRValueReferenceType(ClassType); 8823 8824 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, 8825 CXXMoveConstructor, 8826 false); 8827 8828 DeclarationName Name 8829 = Context.DeclarationNames.getCXXConstructorName( 8830 Context.getCanonicalType(ClassType)); 8831 SourceLocation ClassLoc = ClassDecl->getLocation(); 8832 DeclarationNameInfo NameInfo(Name, ClassLoc); 8833 8834 // C++0x [class.copy]p11: 8835 // An implicitly-declared copy/move constructor is an inline public 8836 // member of its class. 8837 CXXConstructorDecl *MoveConstructor = CXXConstructorDecl::Create( 8838 Context, ClassDecl, ClassLoc, NameInfo, QualType(), /*TInfo=*/0, 8839 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 8840 Constexpr); 8841 MoveConstructor->setAccess(AS_public); 8842 MoveConstructor->setDefaulted(); 8843 MoveConstructor->setTrivial(ClassDecl->hasTrivialMoveConstructor()); 8844 8845 // Build an exception specification pointing back at this member. 8846 FunctionProtoType::ExtProtoInfo EPI; 8847 EPI.ExceptionSpecType = EST_Unevaluated; 8848 EPI.ExceptionSpecDecl = MoveConstructor; 8849 MoveConstructor->setType( 8850 Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI)); 8851 8852 // Add the parameter to the constructor. 8853 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveConstructor, 8854 ClassLoc, ClassLoc, 8855 /*IdentifierInfo=*/0, 8856 ArgType, /*TInfo=*/0, 8857 SC_None, 8858 SC_None, 0); 8859 MoveConstructor->setParams(FromParam); 8860 8861 // C++0x [class.copy]p9: 8862 // If the definition of a class X does not explicitly declare a move 8863 // constructor, one will be implicitly declared as defaulted if and only if: 8864 // [...] 8865 // - the move constructor would not be implicitly defined as deleted. 8866 if (ShouldDeleteSpecialMember(MoveConstructor, CXXMoveConstructor)) { 8867 // Cache this result so that we don't try to generate this over and over 8868 // on every lookup, leaking memory and wasting time. 8869 ClassDecl->setFailedImplicitMoveConstructor(); 8870 return 0; 8871 } 8872 8873 // Note that we have declared this constructor. 8874 ++ASTContext::NumImplicitMoveConstructorsDeclared; 8875 8876 if (Scope *S = getScopeForContext(ClassDecl)) 8877 PushOnScopeChains(MoveConstructor, S, false); 8878 ClassDecl->addDecl(MoveConstructor); 8879 8880 return MoveConstructor; 8881} 8882 8883void Sema::DefineImplicitMoveConstructor(SourceLocation CurrentLocation, 8884 CXXConstructorDecl *MoveConstructor) { 8885 assert((MoveConstructor->isDefaulted() && 8886 MoveConstructor->isMoveConstructor() && 8887 !MoveConstructor->doesThisDeclarationHaveABody() && 8888 !MoveConstructor->isDeleted()) && 8889 "DefineImplicitMoveConstructor - call it for implicit move ctor"); 8890 8891 CXXRecordDecl *ClassDecl = MoveConstructor->getParent(); 8892 assert(ClassDecl && "DefineImplicitMoveConstructor - invalid constructor"); 8893 8894 ImplicitlyDefinedFunctionScope Scope(*this, MoveConstructor); 8895 DiagnosticErrorTrap Trap(Diags); 8896 8897 if (SetCtorInitializers(MoveConstructor, 0, 0, /*AnyErrors=*/false) || 8898 Trap.hasErrorOccurred()) { 8899 Diag(CurrentLocation, diag::note_member_synthesized_at) 8900 << CXXMoveConstructor << Context.getTagDeclType(ClassDecl); 8901 MoveConstructor->setInvalidDecl(); 8902 } else { 8903 Sema::CompoundScopeRAII CompoundScope(*this); 8904 MoveConstructor->setBody(ActOnCompoundStmt(MoveConstructor->getLocation(), 8905 MoveConstructor->getLocation(), 8906 MultiStmtArg(), 8907 /*isStmtExpr=*/false) 8908 .takeAs<Stmt>()); 8909 MoveConstructor->setImplicitlyDefined(true); 8910 } 8911 8912 MoveConstructor->setUsed(); 8913 8914 if (ASTMutationListener *L = getASTMutationListener()) { 8915 L->CompletedImplicitDefinition(MoveConstructor); 8916 } 8917} 8918 8919bool Sema::isImplicitlyDeleted(FunctionDecl *FD) { 8920 return FD->isDeleted() && 8921 (FD->isDefaulted() || FD->isImplicit()) && 8922 isa<CXXMethodDecl>(FD); 8923} 8924 8925/// \brief Mark the call operator of the given lambda closure type as "used". 8926static void markLambdaCallOperatorUsed(Sema &S, CXXRecordDecl *Lambda) { 8927 CXXMethodDecl *CallOperator 8928 = cast<CXXMethodDecl>( 8929 *Lambda->lookup( 8930 S.Context.DeclarationNames.getCXXOperatorName(OO_Call)).first); 8931 CallOperator->setReferenced(); 8932 CallOperator->setUsed(); 8933} 8934 8935void Sema::DefineImplicitLambdaToFunctionPointerConversion( 8936 SourceLocation CurrentLocation, 8937 CXXConversionDecl *Conv) 8938{ 8939 CXXRecordDecl *Lambda = Conv->getParent(); 8940 8941 // Make sure that the lambda call operator is marked used. 8942 markLambdaCallOperatorUsed(*this, Lambda); 8943 8944 Conv->setUsed(); 8945 8946 ImplicitlyDefinedFunctionScope Scope(*this, Conv); 8947 DiagnosticErrorTrap Trap(Diags); 8948 8949 // Return the address of the __invoke function. 8950 DeclarationName InvokeName = &Context.Idents.get("__invoke"); 8951 CXXMethodDecl *Invoke 8952 = cast<CXXMethodDecl>(*Lambda->lookup(InvokeName).first); 8953 Expr *FunctionRef = BuildDeclRefExpr(Invoke, Invoke->getType(), 8954 VK_LValue, Conv->getLocation()).take(); 8955 assert(FunctionRef && "Can't refer to __invoke function?"); 8956 Stmt *Return = ActOnReturnStmt(Conv->getLocation(), FunctionRef).take(); 8957 Conv->setBody(new (Context) CompoundStmt(Context, &Return, 1, 8958 Conv->getLocation(), 8959 Conv->getLocation())); 8960 8961 // Fill in the __invoke function with a dummy implementation. IR generation 8962 // will fill in the actual details. 8963 Invoke->setUsed(); 8964 Invoke->setReferenced(); 8965 Invoke->setBody(new (Context) CompoundStmt(Conv->getLocation())); 8966 8967 if (ASTMutationListener *L = getASTMutationListener()) { 8968 L->CompletedImplicitDefinition(Conv); 8969 L->CompletedImplicitDefinition(Invoke); 8970 } 8971} 8972 8973void Sema::DefineImplicitLambdaToBlockPointerConversion( 8974 SourceLocation CurrentLocation, 8975 CXXConversionDecl *Conv) 8976{ 8977 Conv->setUsed(); 8978 8979 ImplicitlyDefinedFunctionScope Scope(*this, Conv); 8980 DiagnosticErrorTrap Trap(Diags); 8981 8982 // Copy-initialize the lambda object as needed to capture it. 8983 Expr *This = ActOnCXXThis(CurrentLocation).take(); 8984 Expr *DerefThis =CreateBuiltinUnaryOp(CurrentLocation, UO_Deref, This).take(); 8985 8986 ExprResult BuildBlock = BuildBlockForLambdaConversion(CurrentLocation, 8987 Conv->getLocation(), 8988 Conv, DerefThis); 8989 8990 // If we're not under ARC, make sure we still get the _Block_copy/autorelease 8991 // behavior. Note that only the general conversion function does this 8992 // (since it's unusable otherwise); in the case where we inline the 8993 // block literal, it has block literal lifetime semantics. 8994 if (!BuildBlock.isInvalid() && !getLangOpts().ObjCAutoRefCount) 8995 BuildBlock = ImplicitCastExpr::Create(Context, BuildBlock.get()->getType(), 8996 CK_CopyAndAutoreleaseBlockObject, 8997 BuildBlock.get(), 0, VK_RValue); 8998 8999 if (BuildBlock.isInvalid()) { 9000 Diag(CurrentLocation, diag::note_lambda_to_block_conv); 9001 Conv->setInvalidDecl(); 9002 return; 9003 } 9004 9005 // Create the return statement that returns the block from the conversion 9006 // function. 9007 StmtResult Return = ActOnReturnStmt(Conv->getLocation(), BuildBlock.get()); 9008 if (Return.isInvalid()) { 9009 Diag(CurrentLocation, diag::note_lambda_to_block_conv); 9010 Conv->setInvalidDecl(); 9011 return; 9012 } 9013 9014 // Set the body of the conversion function. 9015 Stmt *ReturnS = Return.take(); 9016 Conv->setBody(new (Context) CompoundStmt(Context, &ReturnS, 1, 9017 Conv->getLocation(), 9018 Conv->getLocation())); 9019 9020 // We're done; notify the mutation listener, if any. 9021 if (ASTMutationListener *L = getASTMutationListener()) { 9022 L->CompletedImplicitDefinition(Conv); 9023 } 9024} 9025 9026/// \brief Determine whether the given list arguments contains exactly one 9027/// "real" (non-default) argument. 9028static bool hasOneRealArgument(MultiExprArg Args) { 9029 switch (Args.size()) { 9030 case 0: 9031 return false; 9032 9033 default: 9034 if (!Args[1]->isDefaultArgument()) 9035 return false; 9036 9037 // fall through 9038 case 1: 9039 return !Args[0]->isDefaultArgument(); 9040 } 9041 9042 return false; 9043} 9044 9045ExprResult 9046Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 9047 CXXConstructorDecl *Constructor, 9048 MultiExprArg ExprArgs, 9049 bool HadMultipleCandidates, 9050 bool RequiresZeroInit, 9051 unsigned ConstructKind, 9052 SourceRange ParenRange) { 9053 bool Elidable = false; 9054 9055 // C++0x [class.copy]p34: 9056 // When certain criteria are met, an implementation is allowed to 9057 // omit the copy/move construction of a class object, even if the 9058 // copy/move constructor and/or destructor for the object have 9059 // side effects. [...] 9060 // - when a temporary class object that has not been bound to a 9061 // reference (12.2) would be copied/moved to a class object 9062 // with the same cv-unqualified type, the copy/move operation 9063 // can be omitted by constructing the temporary object 9064 // directly into the target of the omitted copy/move 9065 if (ConstructKind == CXXConstructExpr::CK_Complete && 9066 Constructor->isCopyOrMoveConstructor() && hasOneRealArgument(ExprArgs)) { 9067 Expr *SubExpr = ExprArgs[0]; 9068 Elidable = SubExpr->isTemporaryObject(Context, Constructor->getParent()); 9069 } 9070 9071 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 9072 Elidable, ExprArgs, HadMultipleCandidates, 9073 RequiresZeroInit, ConstructKind, ParenRange); 9074} 9075 9076/// BuildCXXConstructExpr - Creates a complete call to a constructor, 9077/// including handling of its default argument expressions. 9078ExprResult 9079Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 9080 CXXConstructorDecl *Constructor, bool Elidable, 9081 MultiExprArg ExprArgs, 9082 bool HadMultipleCandidates, 9083 bool RequiresZeroInit, 9084 unsigned ConstructKind, 9085 SourceRange ParenRange) { 9086 MarkFunctionReferenced(ConstructLoc, Constructor); 9087 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 9088 Constructor, Elidable, ExprArgs, 9089 HadMultipleCandidates, /*FIXME*/false, 9090 RequiresZeroInit, 9091 static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind), 9092 ParenRange)); 9093} 9094 9095bool Sema::InitializeVarWithConstructor(VarDecl *VD, 9096 CXXConstructorDecl *Constructor, 9097 MultiExprArg Exprs, 9098 bool HadMultipleCandidates) { 9099 // FIXME: Provide the correct paren SourceRange when available. 9100 ExprResult TempResult = 9101 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 9102 Exprs, HadMultipleCandidates, false, 9103 CXXConstructExpr::CK_Complete, SourceRange()); 9104 if (TempResult.isInvalid()) 9105 return true; 9106 9107 Expr *Temp = TempResult.takeAs<Expr>(); 9108 CheckImplicitConversions(Temp, VD->getLocation()); 9109 MarkFunctionReferenced(VD->getLocation(), Constructor); 9110 Temp = MaybeCreateExprWithCleanups(Temp); 9111 VD->setInit(Temp); 9112 9113 return false; 9114} 9115 9116void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 9117 if (VD->isInvalidDecl()) return; 9118 9119 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 9120 if (ClassDecl->isInvalidDecl()) return; 9121 if (ClassDecl->hasIrrelevantDestructor()) return; 9122 if (ClassDecl->isDependentContext()) return; 9123 9124 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 9125 MarkFunctionReferenced(VD->getLocation(), Destructor); 9126 CheckDestructorAccess(VD->getLocation(), Destructor, 9127 PDiag(diag::err_access_dtor_var) 9128 << VD->getDeclName() 9129 << VD->getType()); 9130 DiagnoseUseOfDecl(Destructor, VD->getLocation()); 9131 9132 if (!VD->hasGlobalStorage()) return; 9133 9134 // Emit warning for non-trivial dtor in global scope (a real global, 9135 // class-static, function-static). 9136 Diag(VD->getLocation(), diag::warn_exit_time_destructor); 9137 9138 // TODO: this should be re-enabled for static locals by !CXAAtExit 9139 if (!VD->isStaticLocal()) 9140 Diag(VD->getLocation(), diag::warn_global_destructor); 9141} 9142 9143/// \brief Given a constructor and the set of arguments provided for the 9144/// constructor, convert the arguments and add any required default arguments 9145/// to form a proper call to this constructor. 9146/// 9147/// \returns true if an error occurred, false otherwise. 9148bool 9149Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 9150 MultiExprArg ArgsPtr, 9151 SourceLocation Loc, 9152 SmallVectorImpl<Expr*> &ConvertedArgs, 9153 bool AllowExplicit) { 9154 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 9155 unsigned NumArgs = ArgsPtr.size(); 9156 Expr **Args = ArgsPtr.data(); 9157 9158 const FunctionProtoType *Proto 9159 = Constructor->getType()->getAs<FunctionProtoType>(); 9160 assert(Proto && "Constructor without a prototype?"); 9161 unsigned NumArgsInProto = Proto->getNumArgs(); 9162 9163 // If too few arguments are available, we'll fill in the rest with defaults. 9164 if (NumArgs < NumArgsInProto) 9165 ConvertedArgs.reserve(NumArgsInProto); 9166 else 9167 ConvertedArgs.reserve(NumArgs); 9168 9169 VariadicCallType CallType = 9170 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 9171 SmallVector<Expr *, 8> AllArgs; 9172 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 9173 Proto, 0, Args, NumArgs, AllArgs, 9174 CallType, AllowExplicit); 9175 ConvertedArgs.append(AllArgs.begin(), AllArgs.end()); 9176 9177 DiagnoseSentinelCalls(Constructor, Loc, AllArgs.data(), AllArgs.size()); 9178 9179 CheckConstructorCall(Constructor, AllArgs.data(), AllArgs.size(), 9180 Proto, Loc); 9181 9182 return Invalid; 9183} 9184 9185static inline bool 9186CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 9187 const FunctionDecl *FnDecl) { 9188 const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext(); 9189 if (isa<NamespaceDecl>(DC)) { 9190 return SemaRef.Diag(FnDecl->getLocation(), 9191 diag::err_operator_new_delete_declared_in_namespace) 9192 << FnDecl->getDeclName(); 9193 } 9194 9195 if (isa<TranslationUnitDecl>(DC) && 9196 FnDecl->getStorageClass() == SC_Static) { 9197 return SemaRef.Diag(FnDecl->getLocation(), 9198 diag::err_operator_new_delete_declared_static) 9199 << FnDecl->getDeclName(); 9200 } 9201 9202 return false; 9203} 9204 9205static inline bool 9206CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 9207 CanQualType ExpectedResultType, 9208 CanQualType ExpectedFirstParamType, 9209 unsigned DependentParamTypeDiag, 9210 unsigned InvalidParamTypeDiag) { 9211 QualType ResultType = 9212 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 9213 9214 // Check that the result type is not dependent. 9215 if (ResultType->isDependentType()) 9216 return SemaRef.Diag(FnDecl->getLocation(), 9217 diag::err_operator_new_delete_dependent_result_type) 9218 << FnDecl->getDeclName() << ExpectedResultType; 9219 9220 // Check that the result type is what we expect. 9221 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 9222 return SemaRef.Diag(FnDecl->getLocation(), 9223 diag::err_operator_new_delete_invalid_result_type) 9224 << FnDecl->getDeclName() << ExpectedResultType; 9225 9226 // A function template must have at least 2 parameters. 9227 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 9228 return SemaRef.Diag(FnDecl->getLocation(), 9229 diag::err_operator_new_delete_template_too_few_parameters) 9230 << FnDecl->getDeclName(); 9231 9232 // The function decl must have at least 1 parameter. 9233 if (FnDecl->getNumParams() == 0) 9234 return SemaRef.Diag(FnDecl->getLocation(), 9235 diag::err_operator_new_delete_too_few_parameters) 9236 << FnDecl->getDeclName(); 9237 9238 // Check the first parameter type is not dependent. 9239 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 9240 if (FirstParamType->isDependentType()) 9241 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 9242 << FnDecl->getDeclName() << ExpectedFirstParamType; 9243 9244 // Check that the first parameter type is what we expect. 9245 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 9246 ExpectedFirstParamType) 9247 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 9248 << FnDecl->getDeclName() << ExpectedFirstParamType; 9249 9250 return false; 9251} 9252 9253static bool 9254CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 9255 // C++ [basic.stc.dynamic.allocation]p1: 9256 // A program is ill-formed if an allocation function is declared in a 9257 // namespace scope other than global scope or declared static in global 9258 // scope. 9259 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 9260 return true; 9261 9262 CanQualType SizeTy = 9263 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 9264 9265 // C++ [basic.stc.dynamic.allocation]p1: 9266 // The return type shall be void*. The first parameter shall have type 9267 // std::size_t. 9268 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 9269 SizeTy, 9270 diag::err_operator_new_dependent_param_type, 9271 diag::err_operator_new_param_type)) 9272 return true; 9273 9274 // C++ [basic.stc.dynamic.allocation]p1: 9275 // The first parameter shall not have an associated default argument. 9276 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 9277 return SemaRef.Diag(FnDecl->getLocation(), 9278 diag::err_operator_new_default_arg) 9279 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 9280 9281 return false; 9282} 9283 9284static bool 9285CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 9286 // C++ [basic.stc.dynamic.deallocation]p1: 9287 // A program is ill-formed if deallocation functions are declared in a 9288 // namespace scope other than global scope or declared static in global 9289 // scope. 9290 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 9291 return true; 9292 9293 // C++ [basic.stc.dynamic.deallocation]p2: 9294 // Each deallocation function shall return void and its first parameter 9295 // shall be void*. 9296 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 9297 SemaRef.Context.VoidPtrTy, 9298 diag::err_operator_delete_dependent_param_type, 9299 diag::err_operator_delete_param_type)) 9300 return true; 9301 9302 return false; 9303} 9304 9305/// CheckOverloadedOperatorDeclaration - Check whether the declaration 9306/// of this overloaded operator is well-formed. If so, returns false; 9307/// otherwise, emits appropriate diagnostics and returns true. 9308bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 9309 assert(FnDecl && FnDecl->isOverloadedOperator() && 9310 "Expected an overloaded operator declaration"); 9311 9312 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 9313 9314 // C++ [over.oper]p5: 9315 // The allocation and deallocation functions, operator new, 9316 // operator new[], operator delete and operator delete[], are 9317 // described completely in 3.7.3. The attributes and restrictions 9318 // found in the rest of this subclause do not apply to them unless 9319 // explicitly stated in 3.7.3. 9320 if (Op == OO_Delete || Op == OO_Array_Delete) 9321 return CheckOperatorDeleteDeclaration(*this, FnDecl); 9322 9323 if (Op == OO_New || Op == OO_Array_New) 9324 return CheckOperatorNewDeclaration(*this, FnDecl); 9325 9326 // C++ [over.oper]p6: 9327 // An operator function shall either be a non-static member 9328 // function or be a non-member function and have at least one 9329 // parameter whose type is a class, a reference to a class, an 9330 // enumeration, or a reference to an enumeration. 9331 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 9332 if (MethodDecl->isStatic()) 9333 return Diag(FnDecl->getLocation(), 9334 diag::err_operator_overload_static) << FnDecl->getDeclName(); 9335 } else { 9336 bool ClassOrEnumParam = false; 9337 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 9338 ParamEnd = FnDecl->param_end(); 9339 Param != ParamEnd; ++Param) { 9340 QualType ParamType = (*Param)->getType().getNonReferenceType(); 9341 if (ParamType->isDependentType() || ParamType->isRecordType() || 9342 ParamType->isEnumeralType()) { 9343 ClassOrEnumParam = true; 9344 break; 9345 } 9346 } 9347 9348 if (!ClassOrEnumParam) 9349 return Diag(FnDecl->getLocation(), 9350 diag::err_operator_overload_needs_class_or_enum) 9351 << FnDecl->getDeclName(); 9352 } 9353 9354 // C++ [over.oper]p8: 9355 // An operator function cannot have default arguments (8.3.6), 9356 // except where explicitly stated below. 9357 // 9358 // Only the function-call operator allows default arguments 9359 // (C++ [over.call]p1). 9360 if (Op != OO_Call) { 9361 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 9362 Param != FnDecl->param_end(); ++Param) { 9363 if ((*Param)->hasDefaultArg()) 9364 return Diag((*Param)->getLocation(), 9365 diag::err_operator_overload_default_arg) 9366 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 9367 } 9368 } 9369 9370 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 9371 { false, false, false } 9372#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 9373 , { Unary, Binary, MemberOnly } 9374#include "clang/Basic/OperatorKinds.def" 9375 }; 9376 9377 bool CanBeUnaryOperator = OperatorUses[Op][0]; 9378 bool CanBeBinaryOperator = OperatorUses[Op][1]; 9379 bool MustBeMemberOperator = OperatorUses[Op][2]; 9380 9381 // C++ [over.oper]p8: 9382 // [...] Operator functions cannot have more or fewer parameters 9383 // than the number required for the corresponding operator, as 9384 // described in the rest of this subclause. 9385 unsigned NumParams = FnDecl->getNumParams() 9386 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 9387 if (Op != OO_Call && 9388 ((NumParams == 1 && !CanBeUnaryOperator) || 9389 (NumParams == 2 && !CanBeBinaryOperator) || 9390 (NumParams < 1) || (NumParams > 2))) { 9391 // We have the wrong number of parameters. 9392 unsigned ErrorKind; 9393 if (CanBeUnaryOperator && CanBeBinaryOperator) { 9394 ErrorKind = 2; // 2 -> unary or binary. 9395 } else if (CanBeUnaryOperator) { 9396 ErrorKind = 0; // 0 -> unary 9397 } else { 9398 assert(CanBeBinaryOperator && 9399 "All non-call overloaded operators are unary or binary!"); 9400 ErrorKind = 1; // 1 -> binary 9401 } 9402 9403 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 9404 << FnDecl->getDeclName() << NumParams << ErrorKind; 9405 } 9406 9407 // Overloaded operators other than operator() cannot be variadic. 9408 if (Op != OO_Call && 9409 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 9410 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 9411 << FnDecl->getDeclName(); 9412 } 9413 9414 // Some operators must be non-static member functions. 9415 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 9416 return Diag(FnDecl->getLocation(), 9417 diag::err_operator_overload_must_be_member) 9418 << FnDecl->getDeclName(); 9419 } 9420 9421 // C++ [over.inc]p1: 9422 // The user-defined function called operator++ implements the 9423 // prefix and postfix ++ operator. If this function is a member 9424 // function with no parameters, or a non-member function with one 9425 // parameter of class or enumeration type, it defines the prefix 9426 // increment operator ++ for objects of that type. If the function 9427 // is a member function with one parameter (which shall be of type 9428 // int) or a non-member function with two parameters (the second 9429 // of which shall be of type int), it defines the postfix 9430 // increment operator ++ for objects of that type. 9431 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 9432 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 9433 bool ParamIsInt = false; 9434 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 9435 ParamIsInt = BT->getKind() == BuiltinType::Int; 9436 9437 if (!ParamIsInt) 9438 return Diag(LastParam->getLocation(), 9439 diag::err_operator_overload_post_incdec_must_be_int) 9440 << LastParam->getType() << (Op == OO_MinusMinus); 9441 } 9442 9443 return false; 9444} 9445 9446/// CheckLiteralOperatorDeclaration - Check whether the declaration 9447/// of this literal operator function is well-formed. If so, returns 9448/// false; otherwise, emits appropriate diagnostics and returns true. 9449bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 9450 if (isa<CXXMethodDecl>(FnDecl)) { 9451 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 9452 << FnDecl->getDeclName(); 9453 return true; 9454 } 9455 9456 if (FnDecl->isExternC()) { 9457 Diag(FnDecl->getLocation(), diag::err_literal_operator_extern_c); 9458 return true; 9459 } 9460 9461 bool Valid = false; 9462 9463 // This might be the definition of a literal operator template. 9464 FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate(); 9465 // This might be a specialization of a literal operator template. 9466 if (!TpDecl) 9467 TpDecl = FnDecl->getPrimaryTemplate(); 9468 9469 // template <char...> type operator "" name() is the only valid template 9470 // signature, and the only valid signature with no parameters. 9471 if (TpDecl) { 9472 if (FnDecl->param_size() == 0) { 9473 // Must have only one template parameter 9474 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 9475 if (Params->size() == 1) { 9476 NonTypeTemplateParmDecl *PmDecl = 9477 dyn_cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 9478 9479 // The template parameter must be a char parameter pack. 9480 if (PmDecl && PmDecl->isTemplateParameterPack() && 9481 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 9482 Valid = true; 9483 } 9484 } 9485 } else if (FnDecl->param_size()) { 9486 // Check the first parameter 9487 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 9488 9489 QualType T = (*Param)->getType().getUnqualifiedType(); 9490 9491 // unsigned long long int, long double, and any character type are allowed 9492 // as the only parameters. 9493 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 9494 Context.hasSameType(T, Context.LongDoubleTy) || 9495 Context.hasSameType(T, Context.CharTy) || 9496 Context.hasSameType(T, Context.WCharTy) || 9497 Context.hasSameType(T, Context.Char16Ty) || 9498 Context.hasSameType(T, Context.Char32Ty)) { 9499 if (++Param == FnDecl->param_end()) 9500 Valid = true; 9501 goto FinishedParams; 9502 } 9503 9504 // Otherwise it must be a pointer to const; let's strip those qualifiers. 9505 const PointerType *PT = T->getAs<PointerType>(); 9506 if (!PT) 9507 goto FinishedParams; 9508 T = PT->getPointeeType(); 9509 if (!T.isConstQualified() || T.isVolatileQualified()) 9510 goto FinishedParams; 9511 T = T.getUnqualifiedType(); 9512 9513 // Move on to the second parameter; 9514 ++Param; 9515 9516 // If there is no second parameter, the first must be a const char * 9517 if (Param == FnDecl->param_end()) { 9518 if (Context.hasSameType(T, Context.CharTy)) 9519 Valid = true; 9520 goto FinishedParams; 9521 } 9522 9523 // const char *, const wchar_t*, const char16_t*, and const char32_t* 9524 // are allowed as the first parameter to a two-parameter function 9525 if (!(Context.hasSameType(T, Context.CharTy) || 9526 Context.hasSameType(T, Context.WCharTy) || 9527 Context.hasSameType(T, Context.Char16Ty) || 9528 Context.hasSameType(T, Context.Char32Ty))) 9529 goto FinishedParams; 9530 9531 // The second and final parameter must be an std::size_t 9532 T = (*Param)->getType().getUnqualifiedType(); 9533 if (Context.hasSameType(T, Context.getSizeType()) && 9534 ++Param == FnDecl->param_end()) 9535 Valid = true; 9536 } 9537 9538 // FIXME: This diagnostic is absolutely terrible. 9539FinishedParams: 9540 if (!Valid) { 9541 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 9542 << FnDecl->getDeclName(); 9543 return true; 9544 } 9545 9546 // A parameter-declaration-clause containing a default argument is not 9547 // equivalent to any of the permitted forms. 9548 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 9549 ParamEnd = FnDecl->param_end(); 9550 Param != ParamEnd; ++Param) { 9551 if ((*Param)->hasDefaultArg()) { 9552 Diag((*Param)->getDefaultArgRange().getBegin(), 9553 diag::err_literal_operator_default_argument) 9554 << (*Param)->getDefaultArgRange(); 9555 break; 9556 } 9557 } 9558 9559 StringRef LiteralName 9560 = FnDecl->getDeclName().getCXXLiteralIdentifier()->getName(); 9561 if (LiteralName[0] != '_') { 9562 // C++11 [usrlit.suffix]p1: 9563 // Literal suffix identifiers that do not start with an underscore 9564 // are reserved for future standardization. 9565 Diag(FnDecl->getLocation(), diag::warn_user_literal_reserved); 9566 } 9567 9568 return false; 9569} 9570 9571/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 9572/// linkage specification, including the language and (if present) 9573/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 9574/// the location of the language string literal, which is provided 9575/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 9576/// the '{' brace. Otherwise, this linkage specification does not 9577/// have any braces. 9578Decl *Sema::ActOnStartLinkageSpecification(Scope *S, SourceLocation ExternLoc, 9579 SourceLocation LangLoc, 9580 StringRef Lang, 9581 SourceLocation LBraceLoc) { 9582 LinkageSpecDecl::LanguageIDs Language; 9583 if (Lang == "\"C\"") 9584 Language = LinkageSpecDecl::lang_c; 9585 else if (Lang == "\"C++\"") 9586 Language = LinkageSpecDecl::lang_cxx; 9587 else { 9588 Diag(LangLoc, diag::err_bad_language); 9589 return 0; 9590 } 9591 9592 // FIXME: Add all the various semantics of linkage specifications 9593 9594 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 9595 ExternLoc, LangLoc, Language); 9596 CurContext->addDecl(D); 9597 PushDeclContext(S, D); 9598 return D; 9599} 9600 9601/// ActOnFinishLinkageSpecification - Complete the definition of 9602/// the C++ linkage specification LinkageSpec. If RBraceLoc is 9603/// valid, it's the position of the closing '}' brace in a linkage 9604/// specification that uses braces. 9605Decl *Sema::ActOnFinishLinkageSpecification(Scope *S, 9606 Decl *LinkageSpec, 9607 SourceLocation RBraceLoc) { 9608 if (LinkageSpec) { 9609 if (RBraceLoc.isValid()) { 9610 LinkageSpecDecl* LSDecl = cast<LinkageSpecDecl>(LinkageSpec); 9611 LSDecl->setRBraceLoc(RBraceLoc); 9612 } 9613 PopDeclContext(); 9614 } 9615 return LinkageSpec; 9616} 9617 9618/// \brief Perform semantic analysis for the variable declaration that 9619/// occurs within a C++ catch clause, returning the newly-created 9620/// variable. 9621VarDecl *Sema::BuildExceptionDeclaration(Scope *S, 9622 TypeSourceInfo *TInfo, 9623 SourceLocation StartLoc, 9624 SourceLocation Loc, 9625 IdentifierInfo *Name) { 9626 bool Invalid = false; 9627 QualType ExDeclType = TInfo->getType(); 9628 9629 // Arrays and functions decay. 9630 if (ExDeclType->isArrayType()) 9631 ExDeclType = Context.getArrayDecayedType(ExDeclType); 9632 else if (ExDeclType->isFunctionType()) 9633 ExDeclType = Context.getPointerType(ExDeclType); 9634 9635 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 9636 // The exception-declaration shall not denote a pointer or reference to an 9637 // incomplete type, other than [cv] void*. 9638 // N2844 forbids rvalue references. 9639 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 9640 Diag(Loc, diag::err_catch_rvalue_ref); 9641 Invalid = true; 9642 } 9643 9644 QualType BaseType = ExDeclType; 9645 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 9646 unsigned DK = diag::err_catch_incomplete; 9647 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 9648 BaseType = Ptr->getPointeeType(); 9649 Mode = 1; 9650 DK = diag::err_catch_incomplete_ptr; 9651 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 9652 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 9653 BaseType = Ref->getPointeeType(); 9654 Mode = 2; 9655 DK = diag::err_catch_incomplete_ref; 9656 } 9657 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 9658 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK)) 9659 Invalid = true; 9660 9661 if (!Invalid && !ExDeclType->isDependentType() && 9662 RequireNonAbstractType(Loc, ExDeclType, 9663 diag::err_abstract_type_in_decl, 9664 AbstractVariableType)) 9665 Invalid = true; 9666 9667 // Only the non-fragile NeXT runtime currently supports C++ catches 9668 // of ObjC types, and no runtime supports catching ObjC types by value. 9669 if (!Invalid && getLangOpts().ObjC1) { 9670 QualType T = ExDeclType; 9671 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 9672 T = RT->getPointeeType(); 9673 9674 if (T->isObjCObjectType()) { 9675 Diag(Loc, diag::err_objc_object_catch); 9676 Invalid = true; 9677 } else if (T->isObjCObjectPointerType()) { 9678 // FIXME: should this be a test for macosx-fragile specifically? 9679 if (getLangOpts().ObjCRuntime.isFragile()) 9680 Diag(Loc, diag::warn_objc_pointer_cxx_catch_fragile); 9681 } 9682 } 9683 9684 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, StartLoc, Loc, Name, 9685 ExDeclType, TInfo, SC_None, SC_None); 9686 ExDecl->setExceptionVariable(true); 9687 9688 // In ARC, infer 'retaining' for variables of retainable type. 9689 if (getLangOpts().ObjCAutoRefCount && inferObjCARCLifetime(ExDecl)) 9690 Invalid = true; 9691 9692 if (!Invalid && !ExDeclType->isDependentType()) { 9693 if (const RecordType *recordType = ExDeclType->getAs<RecordType>()) { 9694 // C++ [except.handle]p16: 9695 // The object declared in an exception-declaration or, if the 9696 // exception-declaration does not specify a name, a temporary (12.2) is 9697 // copy-initialized (8.5) from the exception object. [...] 9698 // The object is destroyed when the handler exits, after the destruction 9699 // of any automatic objects initialized within the handler. 9700 // 9701 // We just pretend to initialize the object with itself, then make sure 9702 // it can be destroyed later. 9703 QualType initType = ExDeclType; 9704 9705 InitializedEntity entity = 9706 InitializedEntity::InitializeVariable(ExDecl); 9707 InitializationKind initKind = 9708 InitializationKind::CreateCopy(Loc, SourceLocation()); 9709 9710 Expr *opaqueValue = 9711 new (Context) OpaqueValueExpr(Loc, initType, VK_LValue, OK_Ordinary); 9712 InitializationSequence sequence(*this, entity, initKind, &opaqueValue, 1); 9713 ExprResult result = sequence.Perform(*this, entity, initKind, 9714 MultiExprArg(&opaqueValue, 1)); 9715 if (result.isInvalid()) 9716 Invalid = true; 9717 else { 9718 // If the constructor used was non-trivial, set this as the 9719 // "initializer". 9720 CXXConstructExpr *construct = cast<CXXConstructExpr>(result.take()); 9721 if (!construct->getConstructor()->isTrivial()) { 9722 Expr *init = MaybeCreateExprWithCleanups(construct); 9723 ExDecl->setInit(init); 9724 } 9725 9726 // And make sure it's destructable. 9727 FinalizeVarWithDestructor(ExDecl, recordType); 9728 } 9729 } 9730 } 9731 9732 if (Invalid) 9733 ExDecl->setInvalidDecl(); 9734 9735 return ExDecl; 9736} 9737 9738/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 9739/// handler. 9740Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 9741 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 9742 bool Invalid = D.isInvalidType(); 9743 9744 // Check for unexpanded parameter packs. 9745 if (TInfo && DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 9746 UPPC_ExceptionType)) { 9747 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 9748 D.getIdentifierLoc()); 9749 Invalid = true; 9750 } 9751 9752 IdentifierInfo *II = D.getIdentifier(); 9753 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 9754 LookupOrdinaryName, 9755 ForRedeclaration)) { 9756 // The scope should be freshly made just for us. There is just no way 9757 // it contains any previous declaration. 9758 assert(!S->isDeclScope(PrevDecl)); 9759 if (PrevDecl->isTemplateParameter()) { 9760 // Maybe we will complain about the shadowed template parameter. 9761 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 9762 PrevDecl = 0; 9763 } 9764 } 9765 9766 if (D.getCXXScopeSpec().isSet() && !Invalid) { 9767 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 9768 << D.getCXXScopeSpec().getRange(); 9769 Invalid = true; 9770 } 9771 9772 VarDecl *ExDecl = BuildExceptionDeclaration(S, TInfo, 9773 D.getLocStart(), 9774 D.getIdentifierLoc(), 9775 D.getIdentifier()); 9776 if (Invalid) 9777 ExDecl->setInvalidDecl(); 9778 9779 // Add the exception declaration into this scope. 9780 if (II) 9781 PushOnScopeChains(ExDecl, S); 9782 else 9783 CurContext->addDecl(ExDecl); 9784 9785 ProcessDeclAttributes(S, ExDecl, D); 9786 return ExDecl; 9787} 9788 9789Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation StaticAssertLoc, 9790 Expr *AssertExpr, 9791 Expr *AssertMessageExpr, 9792 SourceLocation RParenLoc) { 9793 StringLiteral *AssertMessage = cast<StringLiteral>(AssertMessageExpr); 9794 9795 if (DiagnoseUnexpandedParameterPack(AssertExpr, UPPC_StaticAssertExpression)) 9796 return 0; 9797 9798 return BuildStaticAssertDeclaration(StaticAssertLoc, AssertExpr, 9799 AssertMessage, RParenLoc, false); 9800} 9801 9802Decl *Sema::BuildStaticAssertDeclaration(SourceLocation StaticAssertLoc, 9803 Expr *AssertExpr, 9804 StringLiteral *AssertMessage, 9805 SourceLocation RParenLoc, 9806 bool Failed) { 9807 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent() && 9808 !Failed) { 9809 // In a static_assert-declaration, the constant-expression shall be a 9810 // constant expression that can be contextually converted to bool. 9811 ExprResult Converted = PerformContextuallyConvertToBool(AssertExpr); 9812 if (Converted.isInvalid()) 9813 Failed = true; 9814 9815 llvm::APSInt Cond; 9816 if (!Failed && VerifyIntegerConstantExpression(Converted.get(), &Cond, 9817 diag::err_static_assert_expression_is_not_constant, 9818 /*AllowFold=*/false).isInvalid()) 9819 Failed = true; 9820 9821 if (!Failed && !Cond) { 9822 llvm::SmallString<256> MsgBuffer; 9823 llvm::raw_svector_ostream Msg(MsgBuffer); 9824 AssertMessage->printPretty(Msg, 0, getPrintingPolicy()); 9825 Diag(StaticAssertLoc, diag::err_static_assert_failed) 9826 << Msg.str() << AssertExpr->getSourceRange(); 9827 Failed = true; 9828 } 9829 } 9830 9831 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, StaticAssertLoc, 9832 AssertExpr, AssertMessage, RParenLoc, 9833 Failed); 9834 9835 CurContext->addDecl(Decl); 9836 return Decl; 9837} 9838 9839/// \brief Perform semantic analysis of the given friend type declaration. 9840/// 9841/// \returns A friend declaration that. 9842FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation Loc, 9843 SourceLocation FriendLoc, 9844 TypeSourceInfo *TSInfo) { 9845 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 9846 9847 QualType T = TSInfo->getType(); 9848 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 9849 9850 // C++03 [class.friend]p2: 9851 // An elaborated-type-specifier shall be used in a friend declaration 9852 // for a class.* 9853 // 9854 // * The class-key of the elaborated-type-specifier is required. 9855 if (!ActiveTemplateInstantiations.empty()) { 9856 // Do not complain about the form of friend template types during 9857 // template instantiation; we will already have complained when the 9858 // template was declared. 9859 } else if (!T->isElaboratedTypeSpecifier()) { 9860 // If we evaluated the type to a record type, suggest putting 9861 // a tag in front. 9862 if (const RecordType *RT = T->getAs<RecordType>()) { 9863 RecordDecl *RD = RT->getDecl(); 9864 9865 std::string InsertionText = std::string(" ") + RD->getKindName(); 9866 9867 Diag(TypeRange.getBegin(), 9868 getLangOpts().CPlusPlus0x ? 9869 diag::warn_cxx98_compat_unelaborated_friend_type : 9870 diag::ext_unelaborated_friend_type) 9871 << (unsigned) RD->getTagKind() 9872 << T 9873 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 9874 InsertionText); 9875 } else { 9876 Diag(FriendLoc, 9877 getLangOpts().CPlusPlus0x ? 9878 diag::warn_cxx98_compat_nonclass_type_friend : 9879 diag::ext_nonclass_type_friend) 9880 << T 9881 << SourceRange(FriendLoc, TypeRange.getEnd()); 9882 } 9883 } else if (T->getAs<EnumType>()) { 9884 Diag(FriendLoc, 9885 getLangOpts().CPlusPlus0x ? 9886 diag::warn_cxx98_compat_enum_friend : 9887 diag::ext_enum_friend) 9888 << T 9889 << SourceRange(FriendLoc, TypeRange.getEnd()); 9890 } 9891 9892 // C++0x [class.friend]p3: 9893 // If the type specifier in a friend declaration designates a (possibly 9894 // cv-qualified) class type, that class is declared as a friend; otherwise, 9895 // the friend declaration is ignored. 9896 9897 // FIXME: C++0x has some syntactic restrictions on friend type declarations 9898 // in [class.friend]p3 that we do not implement. 9899 9900 return FriendDecl::Create(Context, CurContext, Loc, TSInfo, FriendLoc); 9901} 9902 9903/// Handle a friend tag declaration where the scope specifier was 9904/// templated. 9905Decl *Sema::ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc, 9906 unsigned TagSpec, SourceLocation TagLoc, 9907 CXXScopeSpec &SS, 9908 IdentifierInfo *Name, SourceLocation NameLoc, 9909 AttributeList *Attr, 9910 MultiTemplateParamsArg TempParamLists) { 9911 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 9912 9913 bool isExplicitSpecialization = false; 9914 bool Invalid = false; 9915 9916 if (TemplateParameterList *TemplateParams 9917 = MatchTemplateParametersToScopeSpecifier(TagLoc, NameLoc, SS, 9918 TempParamLists.data(), 9919 TempParamLists.size(), 9920 /*friend*/ true, 9921 isExplicitSpecialization, 9922 Invalid)) { 9923 if (TemplateParams->size() > 0) { 9924 // This is a declaration of a class template. 9925 if (Invalid) 9926 return 0; 9927 9928 return CheckClassTemplate(S, TagSpec, TUK_Friend, TagLoc, 9929 SS, Name, NameLoc, Attr, 9930 TemplateParams, AS_public, 9931 /*ModulePrivateLoc=*/SourceLocation(), 9932 TempParamLists.size() - 1, 9933 TempParamLists.data()).take(); 9934 } else { 9935 // The "template<>" header is extraneous. 9936 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 9937 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 9938 isExplicitSpecialization = true; 9939 } 9940 } 9941 9942 if (Invalid) return 0; 9943 9944 bool isAllExplicitSpecializations = true; 9945 for (unsigned I = TempParamLists.size(); I-- > 0; ) { 9946 if (TempParamLists[I]->size()) { 9947 isAllExplicitSpecializations = false; 9948 break; 9949 } 9950 } 9951 9952 // FIXME: don't ignore attributes. 9953 9954 // If it's explicit specializations all the way down, just forget 9955 // about the template header and build an appropriate non-templated 9956 // friend. TODO: for source fidelity, remember the headers. 9957 if (isAllExplicitSpecializations) { 9958 if (SS.isEmpty()) { 9959 bool Owned = false; 9960 bool IsDependent = false; 9961 return ActOnTag(S, TagSpec, TUK_Friend, TagLoc, SS, Name, NameLoc, 9962 Attr, AS_public, 9963 /*ModulePrivateLoc=*/SourceLocation(), 9964 MultiTemplateParamsArg(), Owned, IsDependent, 9965 /*ScopedEnumKWLoc=*/SourceLocation(), 9966 /*ScopedEnumUsesClassTag=*/false, 9967 /*UnderlyingType=*/TypeResult()); 9968 } 9969 9970 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 9971 ElaboratedTypeKeyword Keyword 9972 = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 9973 QualType T = CheckTypenameType(Keyword, TagLoc, QualifierLoc, 9974 *Name, NameLoc); 9975 if (T.isNull()) 9976 return 0; 9977 9978 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 9979 if (isa<DependentNameType>(T)) { 9980 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 9981 TL.setElaboratedKeywordLoc(TagLoc); 9982 TL.setQualifierLoc(QualifierLoc); 9983 TL.setNameLoc(NameLoc); 9984 } else { 9985 ElaboratedTypeLoc TL = cast<ElaboratedTypeLoc>(TSI->getTypeLoc()); 9986 TL.setElaboratedKeywordLoc(TagLoc); 9987 TL.setQualifierLoc(QualifierLoc); 9988 cast<TypeSpecTypeLoc>(TL.getNamedTypeLoc()).setNameLoc(NameLoc); 9989 } 9990 9991 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 9992 TSI, FriendLoc); 9993 Friend->setAccess(AS_public); 9994 CurContext->addDecl(Friend); 9995 return Friend; 9996 } 9997 9998 assert(SS.isNotEmpty() && "valid templated tag with no SS and no direct?"); 9999 10000 10001 10002 // Handle the case of a templated-scope friend class. e.g. 10003 // template <class T> class A<T>::B; 10004 // FIXME: we don't support these right now. 10005 ElaboratedTypeKeyword ETK = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 10006 QualType T = Context.getDependentNameType(ETK, SS.getScopeRep(), Name); 10007 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 10008 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 10009 TL.setElaboratedKeywordLoc(TagLoc); 10010 TL.setQualifierLoc(SS.getWithLocInContext(Context)); 10011 TL.setNameLoc(NameLoc); 10012 10013 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 10014 TSI, FriendLoc); 10015 Friend->setAccess(AS_public); 10016 Friend->setUnsupportedFriend(true); 10017 CurContext->addDecl(Friend); 10018 return Friend; 10019} 10020 10021 10022/// Handle a friend type declaration. This works in tandem with 10023/// ActOnTag. 10024/// 10025/// Notes on friend class templates: 10026/// 10027/// We generally treat friend class declarations as if they were 10028/// declaring a class. So, for example, the elaborated type specifier 10029/// in a friend declaration is required to obey the restrictions of a 10030/// class-head (i.e. no typedefs in the scope chain), template 10031/// parameters are required to match up with simple template-ids, &c. 10032/// However, unlike when declaring a template specialization, it's 10033/// okay to refer to a template specialization without an empty 10034/// template parameter declaration, e.g. 10035/// friend class A<T>::B<unsigned>; 10036/// We permit this as a special case; if there are any template 10037/// parameters present at all, require proper matching, i.e. 10038/// template <> template \<class T> friend class A<int>::B; 10039Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 10040 MultiTemplateParamsArg TempParams) { 10041 SourceLocation Loc = DS.getLocStart(); 10042 10043 assert(DS.isFriendSpecified()); 10044 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 10045 10046 // Try to convert the decl specifier to a type. This works for 10047 // friend templates because ActOnTag never produces a ClassTemplateDecl 10048 // for a TUK_Friend. 10049 Declarator TheDeclarator(DS, Declarator::MemberContext); 10050 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 10051 QualType T = TSI->getType(); 10052 if (TheDeclarator.isInvalidType()) 10053 return 0; 10054 10055 if (DiagnoseUnexpandedParameterPack(Loc, TSI, UPPC_FriendDeclaration)) 10056 return 0; 10057 10058 // This is definitely an error in C++98. It's probably meant to 10059 // be forbidden in C++0x, too, but the specification is just 10060 // poorly written. 10061 // 10062 // The problem is with declarations like the following: 10063 // template <T> friend A<T>::foo; 10064 // where deciding whether a class C is a friend or not now hinges 10065 // on whether there exists an instantiation of A that causes 10066 // 'foo' to equal C. There are restrictions on class-heads 10067 // (which we declare (by fiat) elaborated friend declarations to 10068 // be) that makes this tractable. 10069 // 10070 // FIXME: handle "template <> friend class A<T>;", which 10071 // is possibly well-formed? Who even knows? 10072 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 10073 Diag(Loc, diag::err_tagless_friend_type_template) 10074 << DS.getSourceRange(); 10075 return 0; 10076 } 10077 10078 // C++98 [class.friend]p1: A friend of a class is a function 10079 // or class that is not a member of the class . . . 10080 // This is fixed in DR77, which just barely didn't make the C++03 10081 // deadline. It's also a very silly restriction that seriously 10082 // affects inner classes and which nobody else seems to implement; 10083 // thus we never diagnose it, not even in -pedantic. 10084 // 10085 // But note that we could warn about it: it's always useless to 10086 // friend one of your own members (it's not, however, worthless to 10087 // friend a member of an arbitrary specialization of your template). 10088 10089 Decl *D; 10090 if (unsigned NumTempParamLists = TempParams.size()) 10091 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 10092 NumTempParamLists, 10093 TempParams.data(), 10094 TSI, 10095 DS.getFriendSpecLoc()); 10096 else 10097 D = CheckFriendTypeDecl(Loc, DS.getFriendSpecLoc(), TSI); 10098 10099 if (!D) 10100 return 0; 10101 10102 D->setAccess(AS_public); 10103 CurContext->addDecl(D); 10104 10105 return D; 10106} 10107 10108Decl *Sema::ActOnFriendFunctionDecl(Scope *S, Declarator &D, 10109 MultiTemplateParamsArg TemplateParams) { 10110 const DeclSpec &DS = D.getDeclSpec(); 10111 10112 assert(DS.isFriendSpecified()); 10113 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 10114 10115 SourceLocation Loc = D.getIdentifierLoc(); 10116 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 10117 10118 // C++ [class.friend]p1 10119 // A friend of a class is a function or class.... 10120 // Note that this sees through typedefs, which is intended. 10121 // It *doesn't* see through dependent types, which is correct 10122 // according to [temp.arg.type]p3: 10123 // If a declaration acquires a function type through a 10124 // type dependent on a template-parameter and this causes 10125 // a declaration that does not use the syntactic form of a 10126 // function declarator to have a function type, the program 10127 // is ill-formed. 10128 if (!TInfo->getType()->isFunctionType()) { 10129 Diag(Loc, diag::err_unexpected_friend); 10130 10131 // It might be worthwhile to try to recover by creating an 10132 // appropriate declaration. 10133 return 0; 10134 } 10135 10136 // C++ [namespace.memdef]p3 10137 // - If a friend declaration in a non-local class first declares a 10138 // class or function, the friend class or function is a member 10139 // of the innermost enclosing namespace. 10140 // - The name of the friend is not found by simple name lookup 10141 // until a matching declaration is provided in that namespace 10142 // scope (either before or after the class declaration granting 10143 // friendship). 10144 // - If a friend function is called, its name may be found by the 10145 // name lookup that considers functions from namespaces and 10146 // classes associated with the types of the function arguments. 10147 // - When looking for a prior declaration of a class or a function 10148 // declared as a friend, scopes outside the innermost enclosing 10149 // namespace scope are not considered. 10150 10151 CXXScopeSpec &SS = D.getCXXScopeSpec(); 10152 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 10153 DeclarationName Name = NameInfo.getName(); 10154 assert(Name); 10155 10156 // Check for unexpanded parameter packs. 10157 if (DiagnoseUnexpandedParameterPack(Loc, TInfo, UPPC_FriendDeclaration) || 10158 DiagnoseUnexpandedParameterPack(NameInfo, UPPC_FriendDeclaration) || 10159 DiagnoseUnexpandedParameterPack(SS, UPPC_FriendDeclaration)) 10160 return 0; 10161 10162 // The context we found the declaration in, or in which we should 10163 // create the declaration. 10164 DeclContext *DC; 10165 Scope *DCScope = S; 10166 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 10167 ForRedeclaration); 10168 10169 // FIXME: there are different rules in local classes 10170 10171 // There are four cases here. 10172 // - There's no scope specifier, in which case we just go to the 10173 // appropriate scope and look for a function or function template 10174 // there as appropriate. 10175 // Recover from invalid scope qualifiers as if they just weren't there. 10176 if (SS.isInvalid() || !SS.isSet()) { 10177 // C++0x [namespace.memdef]p3: 10178 // If the name in a friend declaration is neither qualified nor 10179 // a template-id and the declaration is a function or an 10180 // elaborated-type-specifier, the lookup to determine whether 10181 // the entity has been previously declared shall not consider 10182 // any scopes outside the innermost enclosing namespace. 10183 // C++0x [class.friend]p11: 10184 // If a friend declaration appears in a local class and the name 10185 // specified is an unqualified name, a prior declaration is 10186 // looked up without considering scopes that are outside the 10187 // innermost enclosing non-class scope. For a friend function 10188 // declaration, if there is no prior declaration, the program is 10189 // ill-formed. 10190 bool isLocal = cast<CXXRecordDecl>(CurContext)->isLocalClass(); 10191 bool isTemplateId = D.getName().getKind() == UnqualifiedId::IK_TemplateId; 10192 10193 // Find the appropriate context according to the above. 10194 DC = CurContext; 10195 while (true) { 10196 // Skip class contexts. If someone can cite chapter and verse 10197 // for this behavior, that would be nice --- it's what GCC and 10198 // EDG do, and it seems like a reasonable intent, but the spec 10199 // really only says that checks for unqualified existing 10200 // declarations should stop at the nearest enclosing namespace, 10201 // not that they should only consider the nearest enclosing 10202 // namespace. 10203 while (DC->isRecord() || DC->isTransparentContext()) 10204 DC = DC->getParent(); 10205 10206 LookupQualifiedName(Previous, DC); 10207 10208 // TODO: decide what we think about using declarations. 10209 if (isLocal || !Previous.empty()) 10210 break; 10211 10212 if (isTemplateId) { 10213 if (isa<TranslationUnitDecl>(DC)) break; 10214 } else { 10215 if (DC->isFileContext()) break; 10216 } 10217 DC = DC->getParent(); 10218 } 10219 10220 // C++ [class.friend]p1: A friend of a class is a function or 10221 // class that is not a member of the class . . . 10222 // C++11 changes this for both friend types and functions. 10223 // Most C++ 98 compilers do seem to give an error here, so 10224 // we do, too. 10225 if (!Previous.empty() && DC->Equals(CurContext)) 10226 Diag(DS.getFriendSpecLoc(), 10227 getLangOpts().CPlusPlus0x ? 10228 diag::warn_cxx98_compat_friend_is_member : 10229 diag::err_friend_is_member); 10230 10231 DCScope = getScopeForDeclContext(S, DC); 10232 10233 // C++ [class.friend]p6: 10234 // A function can be defined in a friend declaration of a class if and 10235 // only if the class is a non-local class (9.8), the function name is 10236 // unqualified, and the function has namespace scope. 10237 if (isLocal && D.isFunctionDefinition()) { 10238 Diag(NameInfo.getBeginLoc(), diag::err_friend_def_in_local_class); 10239 } 10240 10241 // - There's a non-dependent scope specifier, in which case we 10242 // compute it and do a previous lookup there for a function 10243 // or function template. 10244 } else if (!SS.getScopeRep()->isDependent()) { 10245 DC = computeDeclContext(SS); 10246 if (!DC) return 0; 10247 10248 if (RequireCompleteDeclContext(SS, DC)) return 0; 10249 10250 LookupQualifiedName(Previous, DC); 10251 10252 // Ignore things found implicitly in the wrong scope. 10253 // TODO: better diagnostics for this case. Suggesting the right 10254 // qualified scope would be nice... 10255 LookupResult::Filter F = Previous.makeFilter(); 10256 while (F.hasNext()) { 10257 NamedDecl *D = F.next(); 10258 if (!DC->InEnclosingNamespaceSetOf( 10259 D->getDeclContext()->getRedeclContext())) 10260 F.erase(); 10261 } 10262 F.done(); 10263 10264 if (Previous.empty()) { 10265 D.setInvalidType(); 10266 Diag(Loc, diag::err_qualified_friend_not_found) 10267 << Name << TInfo->getType(); 10268 return 0; 10269 } 10270 10271 // C++ [class.friend]p1: A friend of a class is a function or 10272 // class that is not a member of the class . . . 10273 if (DC->Equals(CurContext)) 10274 Diag(DS.getFriendSpecLoc(), 10275 getLangOpts().CPlusPlus0x ? 10276 diag::warn_cxx98_compat_friend_is_member : 10277 diag::err_friend_is_member); 10278 10279 if (D.isFunctionDefinition()) { 10280 // C++ [class.friend]p6: 10281 // A function can be defined in a friend declaration of a class if and 10282 // only if the class is a non-local class (9.8), the function name is 10283 // unqualified, and the function has namespace scope. 10284 SemaDiagnosticBuilder DB 10285 = Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def); 10286 10287 DB << SS.getScopeRep(); 10288 if (DC->isFileContext()) 10289 DB << FixItHint::CreateRemoval(SS.getRange()); 10290 SS.clear(); 10291 } 10292 10293 // - There's a scope specifier that does not match any template 10294 // parameter lists, in which case we use some arbitrary context, 10295 // create a method or method template, and wait for instantiation. 10296 // - There's a scope specifier that does match some template 10297 // parameter lists, which we don't handle right now. 10298 } else { 10299 if (D.isFunctionDefinition()) { 10300 // C++ [class.friend]p6: 10301 // A function can be defined in a friend declaration of a class if and 10302 // only if the class is a non-local class (9.8), the function name is 10303 // unqualified, and the function has namespace scope. 10304 Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def) 10305 << SS.getScopeRep(); 10306 } 10307 10308 DC = CurContext; 10309 assert(isa<CXXRecordDecl>(DC) && "friend declaration not in class?"); 10310 } 10311 10312 if (!DC->isRecord()) { 10313 // This implies that it has to be an operator or function. 10314 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 10315 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 10316 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 10317 Diag(Loc, diag::err_introducing_special_friend) << 10318 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 10319 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 10320 return 0; 10321 } 10322 } 10323 10324 // FIXME: This is an egregious hack to cope with cases where the scope stack 10325 // does not contain the declaration context, i.e., in an out-of-line 10326 // definition of a class. 10327 Scope FakeDCScope(S, Scope::DeclScope, Diags); 10328 if (!DCScope) { 10329 FakeDCScope.setEntity(DC); 10330 DCScope = &FakeDCScope; 10331 } 10332 10333 bool AddToScope = true; 10334 NamedDecl *ND = ActOnFunctionDeclarator(DCScope, D, DC, TInfo, Previous, 10335 TemplateParams, AddToScope); 10336 if (!ND) return 0; 10337 10338 assert(ND->getDeclContext() == DC); 10339 assert(ND->getLexicalDeclContext() == CurContext); 10340 10341 // Add the function declaration to the appropriate lookup tables, 10342 // adjusting the redeclarations list as necessary. We don't 10343 // want to do this yet if the friending class is dependent. 10344 // 10345 // Also update the scope-based lookup if the target context's 10346 // lookup context is in lexical scope. 10347 if (!CurContext->isDependentContext()) { 10348 DC = DC->getRedeclContext(); 10349 DC->makeDeclVisibleInContext(ND); 10350 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 10351 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 10352 } 10353 10354 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 10355 D.getIdentifierLoc(), ND, 10356 DS.getFriendSpecLoc()); 10357 FrD->setAccess(AS_public); 10358 CurContext->addDecl(FrD); 10359 10360 if (ND->isInvalidDecl()) { 10361 FrD->setInvalidDecl(); 10362 } else { 10363 if (DC->isRecord()) CheckFriendAccess(ND); 10364 10365 FunctionDecl *FD; 10366 if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(ND)) 10367 FD = FTD->getTemplatedDecl(); 10368 else 10369 FD = cast<FunctionDecl>(ND); 10370 10371 // Mark templated-scope function declarations as unsupported. 10372 if (FD->getNumTemplateParameterLists()) 10373 FrD->setUnsupportedFriend(true); 10374 } 10375 10376 return ND; 10377} 10378 10379void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) { 10380 AdjustDeclIfTemplate(Dcl); 10381 10382 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 10383 if (!Fn) { 10384 Diag(DelLoc, diag::err_deleted_non_function); 10385 return; 10386 } 10387 if (const FunctionDecl *Prev = Fn->getPreviousDecl()) { 10388 // Don't consider the implicit declaration we generate for explicit 10389 // specializations. FIXME: Do not generate these implicit declarations. 10390 if ((Prev->getTemplateSpecializationKind() != TSK_ExplicitSpecialization 10391 || Prev->getPreviousDecl()) && !Prev->isDefined()) { 10392 Diag(DelLoc, diag::err_deleted_decl_not_first); 10393 Diag(Prev->getLocation(), diag::note_previous_declaration); 10394 } 10395 // If the declaration wasn't the first, we delete the function anyway for 10396 // recovery. 10397 } 10398 Fn->setDeletedAsWritten(); 10399 10400 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Dcl); 10401 if (!MD) 10402 return; 10403 10404 // A deleted special member function is trivial if the corresponding 10405 // implicitly-declared function would have been. 10406 switch (getSpecialMember(MD)) { 10407 case CXXInvalid: 10408 break; 10409 case CXXDefaultConstructor: 10410 MD->setTrivial(MD->getParent()->hasTrivialDefaultConstructor()); 10411 break; 10412 case CXXCopyConstructor: 10413 MD->setTrivial(MD->getParent()->hasTrivialCopyConstructor()); 10414 break; 10415 case CXXMoveConstructor: 10416 MD->setTrivial(MD->getParent()->hasTrivialMoveConstructor()); 10417 break; 10418 case CXXCopyAssignment: 10419 MD->setTrivial(MD->getParent()->hasTrivialCopyAssignment()); 10420 break; 10421 case CXXMoveAssignment: 10422 MD->setTrivial(MD->getParent()->hasTrivialMoveAssignment()); 10423 break; 10424 case CXXDestructor: 10425 MD->setTrivial(MD->getParent()->hasTrivialDestructor()); 10426 break; 10427 } 10428} 10429 10430void Sema::SetDeclDefaulted(Decl *Dcl, SourceLocation DefaultLoc) { 10431 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Dcl); 10432 10433 if (MD) { 10434 if (MD->getParent()->isDependentType()) { 10435 MD->setDefaulted(); 10436 MD->setExplicitlyDefaulted(); 10437 return; 10438 } 10439 10440 CXXSpecialMember Member = getSpecialMember(MD); 10441 if (Member == CXXInvalid) { 10442 Diag(DefaultLoc, diag::err_default_special_members); 10443 return; 10444 } 10445 10446 MD->setDefaulted(); 10447 MD->setExplicitlyDefaulted(); 10448 10449 // If this definition appears within the record, do the checking when 10450 // the record is complete. 10451 const FunctionDecl *Primary = MD; 10452 if (const FunctionDecl *Pattern = MD->getTemplateInstantiationPattern()) 10453 // Find the uninstantiated declaration that actually had the '= default' 10454 // on it. 10455 Pattern->isDefined(Primary); 10456 10457 if (Primary == Primary->getCanonicalDecl()) 10458 return; 10459 10460 CheckExplicitlyDefaultedSpecialMember(MD); 10461 10462 switch (Member) { 10463 case CXXDefaultConstructor: { 10464 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10465 if (!CD->isInvalidDecl()) 10466 DefineImplicitDefaultConstructor(DefaultLoc, CD); 10467 break; 10468 } 10469 10470 case CXXCopyConstructor: { 10471 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10472 if (!CD->isInvalidDecl()) 10473 DefineImplicitCopyConstructor(DefaultLoc, CD); 10474 break; 10475 } 10476 10477 case CXXCopyAssignment: { 10478 if (!MD->isInvalidDecl()) 10479 DefineImplicitCopyAssignment(DefaultLoc, MD); 10480 break; 10481 } 10482 10483 case CXXDestructor: { 10484 CXXDestructorDecl *DD = cast<CXXDestructorDecl>(MD); 10485 if (!DD->isInvalidDecl()) 10486 DefineImplicitDestructor(DefaultLoc, DD); 10487 break; 10488 } 10489 10490 case CXXMoveConstructor: { 10491 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10492 if (!CD->isInvalidDecl()) 10493 DefineImplicitMoveConstructor(DefaultLoc, CD); 10494 break; 10495 } 10496 10497 case CXXMoveAssignment: { 10498 if (!MD->isInvalidDecl()) 10499 DefineImplicitMoveAssignment(DefaultLoc, MD); 10500 break; 10501 } 10502 10503 case CXXInvalid: 10504 llvm_unreachable("Invalid special member."); 10505 } 10506 } else { 10507 Diag(DefaultLoc, diag::err_default_special_members); 10508 } 10509} 10510 10511static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 10512 for (Stmt::child_range CI = S->children(); CI; ++CI) { 10513 Stmt *SubStmt = *CI; 10514 if (!SubStmt) 10515 continue; 10516 if (isa<ReturnStmt>(SubStmt)) 10517 Self.Diag(SubStmt->getLocStart(), 10518 diag::err_return_in_constructor_handler); 10519 if (!isa<Expr>(SubStmt)) 10520 SearchForReturnInStmt(Self, SubStmt); 10521 } 10522} 10523 10524void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 10525 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 10526 CXXCatchStmt *Handler = TryBlock->getHandler(I); 10527 SearchForReturnInStmt(*this, Handler); 10528 } 10529} 10530 10531bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 10532 const CXXMethodDecl *Old) { 10533 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 10534 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 10535 10536 if (Context.hasSameType(NewTy, OldTy) || 10537 NewTy->isDependentType() || OldTy->isDependentType()) 10538 return false; 10539 10540 // Check if the return types are covariant 10541 QualType NewClassTy, OldClassTy; 10542 10543 /// Both types must be pointers or references to classes. 10544 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 10545 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 10546 NewClassTy = NewPT->getPointeeType(); 10547 OldClassTy = OldPT->getPointeeType(); 10548 } 10549 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 10550 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 10551 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 10552 NewClassTy = NewRT->getPointeeType(); 10553 OldClassTy = OldRT->getPointeeType(); 10554 } 10555 } 10556 } 10557 10558 // The return types aren't either both pointers or references to a class type. 10559 if (NewClassTy.isNull()) { 10560 Diag(New->getLocation(), 10561 diag::err_different_return_type_for_overriding_virtual_function) 10562 << New->getDeclName() << NewTy << OldTy; 10563 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10564 10565 return true; 10566 } 10567 10568 // C++ [class.virtual]p6: 10569 // If the return type of D::f differs from the return type of B::f, the 10570 // class type in the return type of D::f shall be complete at the point of 10571 // declaration of D::f or shall be the class type D. 10572 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 10573 if (!RT->isBeingDefined() && 10574 RequireCompleteType(New->getLocation(), NewClassTy, 10575 diag::err_covariant_return_incomplete, 10576 New->getDeclName())) 10577 return true; 10578 } 10579 10580 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 10581 // Check if the new class derives from the old class. 10582 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 10583 Diag(New->getLocation(), 10584 diag::err_covariant_return_not_derived) 10585 << New->getDeclName() << NewTy << OldTy; 10586 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10587 return true; 10588 } 10589 10590 // Check if we the conversion from derived to base is valid. 10591 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 10592 diag::err_covariant_return_inaccessible_base, 10593 diag::err_covariant_return_ambiguous_derived_to_base_conv, 10594 // FIXME: Should this point to the return type? 10595 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 10596 // FIXME: this note won't trigger for delayed access control 10597 // diagnostics, and it's impossible to get an undelayed error 10598 // here from access control during the original parse because 10599 // the ParsingDeclSpec/ParsingDeclarator are still in scope. 10600 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10601 return true; 10602 } 10603 } 10604 10605 // The qualifiers of the return types must be the same. 10606 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 10607 Diag(New->getLocation(), 10608 diag::err_covariant_return_type_different_qualifications) 10609 << New->getDeclName() << NewTy << OldTy; 10610 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10611 return true; 10612 }; 10613 10614 10615 // The new class type must have the same or less qualifiers as the old type. 10616 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 10617 Diag(New->getLocation(), 10618 diag::err_covariant_return_type_class_type_more_qualified) 10619 << New->getDeclName() << NewTy << OldTy; 10620 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10621 return true; 10622 }; 10623 10624 return false; 10625} 10626 10627/// \brief Mark the given method pure. 10628/// 10629/// \param Method the method to be marked pure. 10630/// 10631/// \param InitRange the source range that covers the "0" initializer. 10632bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 10633 SourceLocation EndLoc = InitRange.getEnd(); 10634 if (EndLoc.isValid()) 10635 Method->setRangeEnd(EndLoc); 10636 10637 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 10638 Method->setPure(); 10639 return false; 10640 } 10641 10642 if (!Method->isInvalidDecl()) 10643 Diag(Method->getLocation(), diag::err_non_virtual_pure) 10644 << Method->getDeclName() << InitRange; 10645 return true; 10646} 10647 10648/// \brief Determine whether the given declaration is a static data member. 10649static bool isStaticDataMember(Decl *D) { 10650 VarDecl *Var = dyn_cast_or_null<VarDecl>(D); 10651 if (!Var) 10652 return false; 10653 10654 return Var->isStaticDataMember(); 10655} 10656/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 10657/// an initializer for the out-of-line declaration 'Dcl'. The scope 10658/// is a fresh scope pushed for just this purpose. 10659/// 10660/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 10661/// static data member of class X, names should be looked up in the scope of 10662/// class X. 10663void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) { 10664 // If there is no declaration, there was an error parsing it. 10665 if (D == 0 || D->isInvalidDecl()) return; 10666 10667 // We should only get called for declarations with scope specifiers, like: 10668 // int foo::bar; 10669 assert(D->isOutOfLine()); 10670 EnterDeclaratorContext(S, D->getDeclContext()); 10671 10672 // If we are parsing the initializer for a static data member, push a 10673 // new expression evaluation context that is associated with this static 10674 // data member. 10675 if (isStaticDataMember(D)) 10676 PushExpressionEvaluationContext(PotentiallyEvaluated, D); 10677} 10678 10679/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 10680/// initializer for the out-of-line declaration 'D'. 10681void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) { 10682 // If there is no declaration, there was an error parsing it. 10683 if (D == 0 || D->isInvalidDecl()) return; 10684 10685 if (isStaticDataMember(D)) 10686 PopExpressionEvaluationContext(); 10687 10688 assert(D->isOutOfLine()); 10689 ExitDeclaratorContext(S); 10690} 10691 10692/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 10693/// C++ if/switch/while/for statement. 10694/// e.g: "if (int x = f()) {...}" 10695DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 10696 // C++ 6.4p2: 10697 // The declarator shall not specify a function or an array. 10698 // The type-specifier-seq shall not contain typedef and shall not declare a 10699 // new class or enumeration. 10700 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 10701 "Parser allowed 'typedef' as storage class of condition decl."); 10702 10703 Decl *Dcl = ActOnDeclarator(S, D); 10704 if (!Dcl) 10705 return true; 10706 10707 if (isa<FunctionDecl>(Dcl)) { // The declarator shall not specify a function. 10708 Diag(Dcl->getLocation(), diag::err_invalid_use_of_function_type) 10709 << D.getSourceRange(); 10710 return true; 10711 } 10712 10713 return Dcl; 10714} 10715 10716void Sema::LoadExternalVTableUses() { 10717 if (!ExternalSource) 10718 return; 10719 10720 SmallVector<ExternalVTableUse, 4> VTables; 10721 ExternalSource->ReadUsedVTables(VTables); 10722 SmallVector<VTableUse, 4> NewUses; 10723 for (unsigned I = 0, N = VTables.size(); I != N; ++I) { 10724 llvm::DenseMap<CXXRecordDecl *, bool>::iterator Pos 10725 = VTablesUsed.find(VTables[I].Record); 10726 // Even if a definition wasn't required before, it may be required now. 10727 if (Pos != VTablesUsed.end()) { 10728 if (!Pos->second && VTables[I].DefinitionRequired) 10729 Pos->second = true; 10730 continue; 10731 } 10732 10733 VTablesUsed[VTables[I].Record] = VTables[I].DefinitionRequired; 10734 NewUses.push_back(VTableUse(VTables[I].Record, VTables[I].Location)); 10735 } 10736 10737 VTableUses.insert(VTableUses.begin(), NewUses.begin(), NewUses.end()); 10738} 10739 10740void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 10741 bool DefinitionRequired) { 10742 // Ignore any vtable uses in unevaluated operands or for classes that do 10743 // not have a vtable. 10744 if (!Class->isDynamicClass() || Class->isDependentContext() || 10745 CurContext->isDependentContext() || 10746 ExprEvalContexts.back().Context == Unevaluated) 10747 return; 10748 10749 // Try to insert this class into the map. 10750 LoadExternalVTableUses(); 10751 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 10752 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 10753 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 10754 if (!Pos.second) { 10755 // If we already had an entry, check to see if we are promoting this vtable 10756 // to required a definition. If so, we need to reappend to the VTableUses 10757 // list, since we may have already processed the first entry. 10758 if (DefinitionRequired && !Pos.first->second) { 10759 Pos.first->second = true; 10760 } else { 10761 // Otherwise, we can early exit. 10762 return; 10763 } 10764 } 10765 10766 // Local classes need to have their virtual members marked 10767 // immediately. For all other classes, we mark their virtual members 10768 // at the end of the translation unit. 10769 if (Class->isLocalClass()) 10770 MarkVirtualMembersReferenced(Loc, Class); 10771 else 10772 VTableUses.push_back(std::make_pair(Class, Loc)); 10773} 10774 10775bool Sema::DefineUsedVTables() { 10776 LoadExternalVTableUses(); 10777 if (VTableUses.empty()) 10778 return false; 10779 10780 // Note: The VTableUses vector could grow as a result of marking 10781 // the members of a class as "used", so we check the size each 10782 // time through the loop and prefer indices (which are stable) to 10783 // iterators (which are not). 10784 bool DefinedAnything = false; 10785 for (unsigned I = 0; I != VTableUses.size(); ++I) { 10786 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 10787 if (!Class) 10788 continue; 10789 10790 SourceLocation Loc = VTableUses[I].second; 10791 10792 bool DefineVTable = true; 10793 10794 // If this class has a key function, but that key function is 10795 // defined in another translation unit, we don't need to emit the 10796 // vtable even though we're using it. 10797 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class); 10798 if (KeyFunction && !KeyFunction->hasBody()) { 10799 switch (KeyFunction->getTemplateSpecializationKind()) { 10800 case TSK_Undeclared: 10801 case TSK_ExplicitSpecialization: 10802 case TSK_ExplicitInstantiationDeclaration: 10803 // The key function is in another translation unit. 10804 DefineVTable = false; 10805 break; 10806 10807 case TSK_ExplicitInstantiationDefinition: 10808 case TSK_ImplicitInstantiation: 10809 // We will be instantiating the key function. 10810 break; 10811 } 10812 } else if (!KeyFunction) { 10813 // If we have a class with no key function that is the subject 10814 // of an explicit instantiation declaration, suppress the 10815 // vtable; it will live with the explicit instantiation 10816 // definition. 10817 bool IsExplicitInstantiationDeclaration 10818 = Class->getTemplateSpecializationKind() 10819 == TSK_ExplicitInstantiationDeclaration; 10820 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 10821 REnd = Class->redecls_end(); 10822 R != REnd; ++R) { 10823 TemplateSpecializationKind TSK 10824 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 10825 if (TSK == TSK_ExplicitInstantiationDeclaration) 10826 IsExplicitInstantiationDeclaration = true; 10827 else if (TSK == TSK_ExplicitInstantiationDefinition) { 10828 IsExplicitInstantiationDeclaration = false; 10829 break; 10830 } 10831 } 10832 10833 if (IsExplicitInstantiationDeclaration) 10834 DefineVTable = false; 10835 } 10836 10837 // The exception specifications for all virtual members may be needed even 10838 // if we are not providing an authoritative form of the vtable in this TU. 10839 // We may choose to emit it available_externally anyway. 10840 if (!DefineVTable) { 10841 MarkVirtualMemberExceptionSpecsNeeded(Loc, Class); 10842 continue; 10843 } 10844 10845 // Mark all of the virtual members of this class as referenced, so 10846 // that we can build a vtable. Then, tell the AST consumer that a 10847 // vtable for this class is required. 10848 DefinedAnything = true; 10849 MarkVirtualMembersReferenced(Loc, Class); 10850 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 10851 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 10852 10853 // Optionally warn if we're emitting a weak vtable. 10854 if (Class->getLinkage() == ExternalLinkage && 10855 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 10856 const FunctionDecl *KeyFunctionDef = 0; 10857 if (!KeyFunction || 10858 (KeyFunction->hasBody(KeyFunctionDef) && 10859 KeyFunctionDef->isInlined())) 10860 Diag(Class->getLocation(), Class->getTemplateSpecializationKind() == 10861 TSK_ExplicitInstantiationDefinition 10862 ? diag::warn_weak_template_vtable : diag::warn_weak_vtable) 10863 << Class; 10864 } 10865 } 10866 VTableUses.clear(); 10867 10868 return DefinedAnything; 10869} 10870 10871void Sema::MarkVirtualMemberExceptionSpecsNeeded(SourceLocation Loc, 10872 const CXXRecordDecl *RD) { 10873 for (CXXRecordDecl::method_iterator I = RD->method_begin(), 10874 E = RD->method_end(); I != E; ++I) 10875 if ((*I)->isVirtual() && !(*I)->isPure()) 10876 ResolveExceptionSpec(Loc, (*I)->getType()->castAs<FunctionProtoType>()); 10877} 10878 10879void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 10880 const CXXRecordDecl *RD) { 10881 // Mark all functions which will appear in RD's vtable as used. 10882 CXXFinalOverriderMap FinalOverriders; 10883 RD->getFinalOverriders(FinalOverriders); 10884 for (CXXFinalOverriderMap::const_iterator I = FinalOverriders.begin(), 10885 E = FinalOverriders.end(); 10886 I != E; ++I) { 10887 for (OverridingMethods::const_iterator OI = I->second.begin(), 10888 OE = I->second.end(); 10889 OI != OE; ++OI) { 10890 assert(OI->second.size() > 0 && "no final overrider"); 10891 CXXMethodDecl *Overrider = OI->second.front().Method; 10892 10893 // C++ [basic.def.odr]p2: 10894 // [...] A virtual member function is used if it is not pure. [...] 10895 if (!Overrider->isPure()) 10896 MarkFunctionReferenced(Loc, Overrider); 10897 } 10898 } 10899 10900 // Only classes that have virtual bases need a VTT. 10901 if (RD->getNumVBases() == 0) 10902 return; 10903 10904 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 10905 e = RD->bases_end(); i != e; ++i) { 10906 const CXXRecordDecl *Base = 10907 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 10908 if (Base->getNumVBases() == 0) 10909 continue; 10910 MarkVirtualMembersReferenced(Loc, Base); 10911 } 10912} 10913 10914/// SetIvarInitializers - This routine builds initialization ASTs for the 10915/// Objective-C implementation whose ivars need be initialized. 10916void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 10917 if (!getLangOpts().CPlusPlus) 10918 return; 10919 if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 10920 SmallVector<ObjCIvarDecl*, 8> ivars; 10921 CollectIvarsToConstructOrDestruct(OID, ivars); 10922 if (ivars.empty()) 10923 return; 10924 SmallVector<CXXCtorInitializer*, 32> AllToInit; 10925 for (unsigned i = 0; i < ivars.size(); i++) { 10926 FieldDecl *Field = ivars[i]; 10927 if (Field->isInvalidDecl()) 10928 continue; 10929 10930 CXXCtorInitializer *Member; 10931 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 10932 InitializationKind InitKind = 10933 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 10934 10935 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 10936 ExprResult MemberInit = 10937 InitSeq.Perform(*this, InitEntity, InitKind, MultiExprArg()); 10938 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 10939 // Note, MemberInit could actually come back empty if no initialization 10940 // is required (e.g., because it would call a trivial default constructor) 10941 if (!MemberInit.get() || MemberInit.isInvalid()) 10942 continue; 10943 10944 Member = 10945 new (Context) CXXCtorInitializer(Context, Field, SourceLocation(), 10946 SourceLocation(), 10947 MemberInit.takeAs<Expr>(), 10948 SourceLocation()); 10949 AllToInit.push_back(Member); 10950 10951 // Be sure that the destructor is accessible and is marked as referenced. 10952 if (const RecordType *RecordTy 10953 = Context.getBaseElementType(Field->getType()) 10954 ->getAs<RecordType>()) { 10955 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 10956 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 10957 MarkFunctionReferenced(Field->getLocation(), Destructor); 10958 CheckDestructorAccess(Field->getLocation(), Destructor, 10959 PDiag(diag::err_access_dtor_ivar) 10960 << Context.getBaseElementType(Field->getType())); 10961 } 10962 } 10963 } 10964 ObjCImplementation->setIvarInitializers(Context, 10965 AllToInit.data(), AllToInit.size()); 10966 } 10967} 10968 10969static 10970void DelegatingCycleHelper(CXXConstructorDecl* Ctor, 10971 llvm::SmallSet<CXXConstructorDecl*, 4> &Valid, 10972 llvm::SmallSet<CXXConstructorDecl*, 4> &Invalid, 10973 llvm::SmallSet<CXXConstructorDecl*, 4> &Current, 10974 Sema &S) { 10975 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 10976 CE = Current.end(); 10977 if (Ctor->isInvalidDecl()) 10978 return; 10979 10980 CXXConstructorDecl *Target = Ctor->getTargetConstructor(); 10981 10982 // Target may not be determinable yet, for instance if this is a dependent 10983 // call in an uninstantiated template. 10984 if (Target) { 10985 const FunctionDecl *FNTarget = 0; 10986 (void)Target->hasBody(FNTarget); 10987 Target = const_cast<CXXConstructorDecl*>( 10988 cast_or_null<CXXConstructorDecl>(FNTarget)); 10989 } 10990 10991 CXXConstructorDecl *Canonical = Ctor->getCanonicalDecl(), 10992 // Avoid dereferencing a null pointer here. 10993 *TCanonical = Target ? Target->getCanonicalDecl() : 0; 10994 10995 if (!Current.insert(Canonical)) 10996 return; 10997 10998 // We know that beyond here, we aren't chaining into a cycle. 10999 if (!Target || !Target->isDelegatingConstructor() || 11000 Target->isInvalidDecl() || Valid.count(TCanonical)) { 11001 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 11002 Valid.insert(*CI); 11003 Current.clear(); 11004 // We've hit a cycle. 11005 } else if (TCanonical == Canonical || Invalid.count(TCanonical) || 11006 Current.count(TCanonical)) { 11007 // If we haven't diagnosed this cycle yet, do so now. 11008 if (!Invalid.count(TCanonical)) { 11009 S.Diag((*Ctor->init_begin())->getSourceLocation(), 11010 diag::warn_delegating_ctor_cycle) 11011 << Ctor; 11012 11013 // Don't add a note for a function delegating directly to itself. 11014 if (TCanonical != Canonical) 11015 S.Diag(Target->getLocation(), diag::note_it_delegates_to); 11016 11017 CXXConstructorDecl *C = Target; 11018 while (C->getCanonicalDecl() != Canonical) { 11019 const FunctionDecl *FNTarget = 0; 11020 (void)C->getTargetConstructor()->hasBody(FNTarget); 11021 assert(FNTarget && "Ctor cycle through bodiless function"); 11022 11023 C = const_cast<CXXConstructorDecl*>( 11024 cast<CXXConstructorDecl>(FNTarget)); 11025 S.Diag(C->getLocation(), diag::note_which_delegates_to); 11026 } 11027 } 11028 11029 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 11030 Invalid.insert(*CI); 11031 Current.clear(); 11032 } else { 11033 DelegatingCycleHelper(Target, Valid, Invalid, Current, S); 11034 } 11035} 11036 11037 11038void Sema::CheckDelegatingCtorCycles() { 11039 llvm::SmallSet<CXXConstructorDecl*, 4> Valid, Invalid, Current; 11040 11041 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 11042 CE = Current.end(); 11043 11044 for (DelegatingCtorDeclsType::iterator 11045 I = DelegatingCtorDecls.begin(ExternalSource), 11046 E = DelegatingCtorDecls.end(); 11047 I != E; ++I) 11048 DelegatingCycleHelper(*I, Valid, Invalid, Current, *this); 11049 11050 for (CI = Invalid.begin(), CE = Invalid.end(); CI != CE; ++CI) 11051 (*CI)->setInvalidDecl(); 11052} 11053 11054namespace { 11055 /// \brief AST visitor that finds references to the 'this' expression. 11056 class FindCXXThisExpr : public RecursiveASTVisitor<FindCXXThisExpr> { 11057 Sema &S; 11058 11059 public: 11060 explicit FindCXXThisExpr(Sema &S) : S(S) { } 11061 11062 bool VisitCXXThisExpr(CXXThisExpr *E) { 11063 S.Diag(E->getLocation(), diag::err_this_static_member_func) 11064 << E->isImplicit(); 11065 return false; 11066 } 11067 }; 11068} 11069 11070bool Sema::checkThisInStaticMemberFunctionType(CXXMethodDecl *Method) { 11071 TypeSourceInfo *TSInfo = Method->getTypeSourceInfo(); 11072 if (!TSInfo) 11073 return false; 11074 11075 TypeLoc TL = TSInfo->getTypeLoc(); 11076 FunctionProtoTypeLoc *ProtoTL = dyn_cast<FunctionProtoTypeLoc>(&TL); 11077 if (!ProtoTL) 11078 return false; 11079 11080 // C++11 [expr.prim.general]p3: 11081 // [The expression this] shall not appear before the optional 11082 // cv-qualifier-seq and it shall not appear within the declaration of a 11083 // static member function (although its type and value category are defined 11084 // within a static member function as they are within a non-static member 11085 // function). [ Note: this is because declaration matching does not occur 11086 // until the complete declarator is known. - end note ] 11087 const FunctionProtoType *Proto = ProtoTL->getTypePtr(); 11088 FindCXXThisExpr Finder(*this); 11089 11090 // If the return type came after the cv-qualifier-seq, check it now. 11091 if (Proto->hasTrailingReturn() && 11092 !Finder.TraverseTypeLoc(ProtoTL->getResultLoc())) 11093 return true; 11094 11095 // Check the exception specification. 11096 if (checkThisInStaticMemberFunctionExceptionSpec(Method)) 11097 return true; 11098 11099 return checkThisInStaticMemberFunctionAttributes(Method); 11100} 11101 11102bool Sema::checkThisInStaticMemberFunctionExceptionSpec(CXXMethodDecl *Method) { 11103 TypeSourceInfo *TSInfo = Method->getTypeSourceInfo(); 11104 if (!TSInfo) 11105 return false; 11106 11107 TypeLoc TL = TSInfo->getTypeLoc(); 11108 FunctionProtoTypeLoc *ProtoTL = dyn_cast<FunctionProtoTypeLoc>(&TL); 11109 if (!ProtoTL) 11110 return false; 11111 11112 const FunctionProtoType *Proto = ProtoTL->getTypePtr(); 11113 FindCXXThisExpr Finder(*this); 11114 11115 switch (Proto->getExceptionSpecType()) { 11116 case EST_Uninstantiated: 11117 case EST_Unevaluated: 11118 case EST_BasicNoexcept: 11119 case EST_DynamicNone: 11120 case EST_MSAny: 11121 case EST_None: 11122 break; 11123 11124 case EST_ComputedNoexcept: 11125 if (!Finder.TraverseStmt(Proto->getNoexceptExpr())) 11126 return true; 11127 11128 case EST_Dynamic: 11129 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(), 11130 EEnd = Proto->exception_end(); 11131 E != EEnd; ++E) { 11132 if (!Finder.TraverseType(*E)) 11133 return true; 11134 } 11135 break; 11136 } 11137 11138 return false; 11139} 11140 11141bool Sema::checkThisInStaticMemberFunctionAttributes(CXXMethodDecl *Method) { 11142 FindCXXThisExpr Finder(*this); 11143 11144 // Check attributes. 11145 for (Decl::attr_iterator A = Method->attr_begin(), AEnd = Method->attr_end(); 11146 A != AEnd; ++A) { 11147 // FIXME: This should be emitted by tblgen. 11148 Expr *Arg = 0; 11149 ArrayRef<Expr *> Args; 11150 if (GuardedByAttr *G = dyn_cast<GuardedByAttr>(*A)) 11151 Arg = G->getArg(); 11152 else if (PtGuardedByAttr *G = dyn_cast<PtGuardedByAttr>(*A)) 11153 Arg = G->getArg(); 11154 else if (AcquiredAfterAttr *AA = dyn_cast<AcquiredAfterAttr>(*A)) 11155 Args = ArrayRef<Expr *>(AA->args_begin(), AA->args_size()); 11156 else if (AcquiredBeforeAttr *AB = dyn_cast<AcquiredBeforeAttr>(*A)) 11157 Args = ArrayRef<Expr *>(AB->args_begin(), AB->args_size()); 11158 else if (ExclusiveLockFunctionAttr *ELF 11159 = dyn_cast<ExclusiveLockFunctionAttr>(*A)) 11160 Args = ArrayRef<Expr *>(ELF->args_begin(), ELF->args_size()); 11161 else if (SharedLockFunctionAttr *SLF 11162 = dyn_cast<SharedLockFunctionAttr>(*A)) 11163 Args = ArrayRef<Expr *>(SLF->args_begin(), SLF->args_size()); 11164 else if (ExclusiveTrylockFunctionAttr *ETLF 11165 = dyn_cast<ExclusiveTrylockFunctionAttr>(*A)) { 11166 Arg = ETLF->getSuccessValue(); 11167 Args = ArrayRef<Expr *>(ETLF->args_begin(), ETLF->args_size()); 11168 } else if (SharedTrylockFunctionAttr *STLF 11169 = dyn_cast<SharedTrylockFunctionAttr>(*A)) { 11170 Arg = STLF->getSuccessValue(); 11171 Args = ArrayRef<Expr *>(STLF->args_begin(), STLF->args_size()); 11172 } else if (UnlockFunctionAttr *UF = dyn_cast<UnlockFunctionAttr>(*A)) 11173 Args = ArrayRef<Expr *>(UF->args_begin(), UF->args_size()); 11174 else if (LockReturnedAttr *LR = dyn_cast<LockReturnedAttr>(*A)) 11175 Arg = LR->getArg(); 11176 else if (LocksExcludedAttr *LE = dyn_cast<LocksExcludedAttr>(*A)) 11177 Args = ArrayRef<Expr *>(LE->args_begin(), LE->args_size()); 11178 else if (ExclusiveLocksRequiredAttr *ELR 11179 = dyn_cast<ExclusiveLocksRequiredAttr>(*A)) 11180 Args = ArrayRef<Expr *>(ELR->args_begin(), ELR->args_size()); 11181 else if (SharedLocksRequiredAttr *SLR 11182 = dyn_cast<SharedLocksRequiredAttr>(*A)) 11183 Args = ArrayRef<Expr *>(SLR->args_begin(), SLR->args_size()); 11184 11185 if (Arg && !Finder.TraverseStmt(Arg)) 11186 return true; 11187 11188 for (unsigned I = 0, N = Args.size(); I != N; ++I) { 11189 if (!Finder.TraverseStmt(Args[I])) 11190 return true; 11191 } 11192 } 11193 11194 return false; 11195} 11196 11197void 11198Sema::checkExceptionSpecification(ExceptionSpecificationType EST, 11199 ArrayRef<ParsedType> DynamicExceptions, 11200 ArrayRef<SourceRange> DynamicExceptionRanges, 11201 Expr *NoexceptExpr, 11202 llvm::SmallVectorImpl<QualType> &Exceptions, 11203 FunctionProtoType::ExtProtoInfo &EPI) { 11204 Exceptions.clear(); 11205 EPI.ExceptionSpecType = EST; 11206 if (EST == EST_Dynamic) { 11207 Exceptions.reserve(DynamicExceptions.size()); 11208 for (unsigned ei = 0, ee = DynamicExceptions.size(); ei != ee; ++ei) { 11209 // FIXME: Preserve type source info. 11210 QualType ET = GetTypeFromParser(DynamicExceptions[ei]); 11211 11212 SmallVector<UnexpandedParameterPack, 2> Unexpanded; 11213 collectUnexpandedParameterPacks(ET, Unexpanded); 11214 if (!Unexpanded.empty()) { 11215 DiagnoseUnexpandedParameterPacks(DynamicExceptionRanges[ei].getBegin(), 11216 UPPC_ExceptionType, 11217 Unexpanded); 11218 continue; 11219 } 11220 11221 // Check that the type is valid for an exception spec, and 11222 // drop it if not. 11223 if (!CheckSpecifiedExceptionType(ET, DynamicExceptionRanges[ei])) 11224 Exceptions.push_back(ET); 11225 } 11226 EPI.NumExceptions = Exceptions.size(); 11227 EPI.Exceptions = Exceptions.data(); 11228 return; 11229 } 11230 11231 if (EST == EST_ComputedNoexcept) { 11232 // If an error occurred, there's no expression here. 11233 if (NoexceptExpr) { 11234 assert((NoexceptExpr->isTypeDependent() || 11235 NoexceptExpr->getType()->getCanonicalTypeUnqualified() == 11236 Context.BoolTy) && 11237 "Parser should have made sure that the expression is boolean"); 11238 if (NoexceptExpr && DiagnoseUnexpandedParameterPack(NoexceptExpr)) { 11239 EPI.ExceptionSpecType = EST_BasicNoexcept; 11240 return; 11241 } 11242 11243 if (!NoexceptExpr->isValueDependent()) 11244 NoexceptExpr = VerifyIntegerConstantExpression(NoexceptExpr, 0, 11245 diag::err_noexcept_needs_constant_expression, 11246 /*AllowFold*/ false).take(); 11247 EPI.NoexceptExpr = NoexceptExpr; 11248 } 11249 return; 11250 } 11251} 11252 11253/// IdentifyCUDATarget - Determine the CUDA compilation target for this function 11254Sema::CUDAFunctionTarget Sema::IdentifyCUDATarget(const FunctionDecl *D) { 11255 // Implicitly declared functions (e.g. copy constructors) are 11256 // __host__ __device__ 11257 if (D->isImplicit()) 11258 return CFT_HostDevice; 11259 11260 if (D->hasAttr<CUDAGlobalAttr>()) 11261 return CFT_Global; 11262 11263 if (D->hasAttr<CUDADeviceAttr>()) { 11264 if (D->hasAttr<CUDAHostAttr>()) 11265 return CFT_HostDevice; 11266 else 11267 return CFT_Device; 11268 } 11269 11270 return CFT_Host; 11271} 11272 11273bool Sema::CheckCUDATarget(CUDAFunctionTarget CallerTarget, 11274 CUDAFunctionTarget CalleeTarget) { 11275 // CUDA B.1.1 "The __device__ qualifier declares a function that is... 11276 // Callable from the device only." 11277 if (CallerTarget == CFT_Host && CalleeTarget == CFT_Device) 11278 return true; 11279 11280 // CUDA B.1.2 "The __global__ qualifier declares a function that is... 11281 // Callable from the host only." 11282 // CUDA B.1.3 "The __host__ qualifier declares a function that is... 11283 // Callable from the host only." 11284 if ((CallerTarget == CFT_Device || CallerTarget == CFT_Global) && 11285 (CalleeTarget == CFT_Host || CalleeTarget == CFT_Global)) 11286 return true; 11287 11288 if (CallerTarget == CFT_HostDevice && CalleeTarget != CFT_HostDevice) 11289 return true; 11290 11291 return false; 11292} 11293