SemaDeclCXX.cpp revision 568eae48a4e19c0359cdcd2a33b8ec9812e4abbc
1//===------ SemaDeclCXX.cpp - Semantic Analysis for C++ Declarations ------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements semantic analysis for C++ declarations. 11// 12//===----------------------------------------------------------------------===// 13 14#include "clang/Sema/SemaInternal.h" 15#include "clang/Sema/CXXFieldCollector.h" 16#include "clang/Sema/Scope.h" 17#include "clang/Sema/Initialization.h" 18#include "clang/Sema/Lookup.h" 19#include "clang/Sema/ScopeInfo.h" 20#include "clang/AST/ASTConsumer.h" 21#include "clang/AST/ASTContext.h" 22#include "clang/AST/ASTMutationListener.h" 23#include "clang/AST/CharUnits.h" 24#include "clang/AST/CXXInheritance.h" 25#include "clang/AST/DeclVisitor.h" 26#include "clang/AST/ExprCXX.h" 27#include "clang/AST/RecordLayout.h" 28#include "clang/AST/RecursiveASTVisitor.h" 29#include "clang/AST/StmtVisitor.h" 30#include "clang/AST/TypeLoc.h" 31#include "clang/AST/TypeOrdering.h" 32#include "clang/Sema/DeclSpec.h" 33#include "clang/Sema/ParsedTemplate.h" 34#include "clang/Basic/PartialDiagnostic.h" 35#include "clang/Lex/Preprocessor.h" 36#include "llvm/ADT/SmallString.h" 37#include "llvm/ADT/STLExtras.h" 38#include <map> 39#include <set> 40 41using namespace clang; 42 43//===----------------------------------------------------------------------===// 44// CheckDefaultArgumentVisitor 45//===----------------------------------------------------------------------===// 46 47namespace { 48 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses 49 /// the default argument of a parameter to determine whether it 50 /// contains any ill-formed subexpressions. For example, this will 51 /// diagnose the use of local variables or parameters within the 52 /// default argument expression. 53 class CheckDefaultArgumentVisitor 54 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { 55 Expr *DefaultArg; 56 Sema *S; 57 58 public: 59 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) 60 : DefaultArg(defarg), S(s) {} 61 62 bool VisitExpr(Expr *Node); 63 bool VisitDeclRefExpr(DeclRefExpr *DRE); 64 bool VisitCXXThisExpr(CXXThisExpr *ThisE); 65 bool VisitLambdaExpr(LambdaExpr *Lambda); 66 }; 67 68 /// VisitExpr - Visit all of the children of this expression. 69 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 70 bool IsInvalid = false; 71 for (Stmt::child_range I = Node->children(); I; ++I) 72 IsInvalid |= Visit(*I); 73 return IsInvalid; 74 } 75 76 /// VisitDeclRefExpr - Visit a reference to a declaration, to 77 /// determine whether this declaration can be used in the default 78 /// argument expression. 79 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { 80 NamedDecl *Decl = DRE->getDecl(); 81 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { 82 // C++ [dcl.fct.default]p9 83 // Default arguments are evaluated each time the function is 84 // called. The order of evaluation of function arguments is 85 // unspecified. Consequently, parameters of a function shall not 86 // be used in default argument expressions, even if they are not 87 // evaluated. Parameters of a function declared before a default 88 // argument expression are in scope and can hide namespace and 89 // class member names. 90 return S->Diag(DRE->getLocStart(), 91 diag::err_param_default_argument_references_param) 92 << Param->getDeclName() << DefaultArg->getSourceRange(); 93 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { 94 // C++ [dcl.fct.default]p7 95 // Local variables shall not be used in default argument 96 // expressions. 97 if (VDecl->isLocalVarDecl()) 98 return S->Diag(DRE->getLocStart(), 99 diag::err_param_default_argument_references_local) 100 << VDecl->getDeclName() << DefaultArg->getSourceRange(); 101 } 102 103 return false; 104 } 105 106 /// VisitCXXThisExpr - Visit a C++ "this" expression. 107 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { 108 // C++ [dcl.fct.default]p8: 109 // The keyword this shall not be used in a default argument of a 110 // member function. 111 return S->Diag(ThisE->getLocStart(), 112 diag::err_param_default_argument_references_this) 113 << ThisE->getSourceRange(); 114 } 115 116 bool CheckDefaultArgumentVisitor::VisitLambdaExpr(LambdaExpr *Lambda) { 117 // C++11 [expr.lambda.prim]p13: 118 // A lambda-expression appearing in a default argument shall not 119 // implicitly or explicitly capture any entity. 120 if (Lambda->capture_begin() == Lambda->capture_end()) 121 return false; 122 123 return S->Diag(Lambda->getLocStart(), 124 diag::err_lambda_capture_default_arg); 125 } 126} 127 128void Sema::ImplicitExceptionSpecification::CalledDecl(SourceLocation CallLoc, 129 CXXMethodDecl *Method) { 130 // If we have an MSAny or unknown spec already, don't bother. 131 if (!Method || ComputedEST == EST_MSAny || ComputedEST == EST_Delayed) 132 return; 133 134 const FunctionProtoType *Proto 135 = Method->getType()->getAs<FunctionProtoType>(); 136 Proto = Self->ResolveExceptionSpec(CallLoc, Proto); 137 if (!Proto) 138 return; 139 140 ExceptionSpecificationType EST = Proto->getExceptionSpecType(); 141 142 // If this function can throw any exceptions, make a note of that. 143 if (EST == EST_Delayed || EST == EST_MSAny || EST == EST_None) { 144 ClearExceptions(); 145 ComputedEST = EST; 146 return; 147 } 148 149 // FIXME: If the call to this decl is using any of its default arguments, we 150 // need to search them for potentially-throwing calls. 151 152 // If this function has a basic noexcept, it doesn't affect the outcome. 153 if (EST == EST_BasicNoexcept) 154 return; 155 156 // If we have a throw-all spec at this point, ignore the function. 157 if (ComputedEST == EST_None) 158 return; 159 160 // If we're still at noexcept(true) and there's a nothrow() callee, 161 // change to that specification. 162 if (EST == EST_DynamicNone) { 163 if (ComputedEST == EST_BasicNoexcept) 164 ComputedEST = EST_DynamicNone; 165 return; 166 } 167 168 // Check out noexcept specs. 169 if (EST == EST_ComputedNoexcept) { 170 FunctionProtoType::NoexceptResult NR = 171 Proto->getNoexceptSpec(Self->Context); 172 assert(NR != FunctionProtoType::NR_NoNoexcept && 173 "Must have noexcept result for EST_ComputedNoexcept."); 174 assert(NR != FunctionProtoType::NR_Dependent && 175 "Should not generate implicit declarations for dependent cases, " 176 "and don't know how to handle them anyway."); 177 178 // noexcept(false) -> no spec on the new function 179 if (NR == FunctionProtoType::NR_Throw) { 180 ClearExceptions(); 181 ComputedEST = EST_None; 182 } 183 // noexcept(true) won't change anything either. 184 return; 185 } 186 187 assert(EST == EST_Dynamic && "EST case not considered earlier."); 188 assert(ComputedEST != EST_None && 189 "Shouldn't collect exceptions when throw-all is guaranteed."); 190 ComputedEST = EST_Dynamic; 191 // Record the exceptions in this function's exception specification. 192 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(), 193 EEnd = Proto->exception_end(); 194 E != EEnd; ++E) 195 if (ExceptionsSeen.insert(Self->Context.getCanonicalType(*E))) 196 Exceptions.push_back(*E); 197} 198 199void Sema::ImplicitExceptionSpecification::CalledExpr(Expr *E) { 200 if (!E || ComputedEST == EST_MSAny || ComputedEST == EST_Delayed) 201 return; 202 203 // FIXME: 204 // 205 // C++0x [except.spec]p14: 206 // [An] implicit exception-specification specifies the type-id T if and 207 // only if T is allowed by the exception-specification of a function directly 208 // invoked by f's implicit definition; f shall allow all exceptions if any 209 // function it directly invokes allows all exceptions, and f shall allow no 210 // exceptions if every function it directly invokes allows no exceptions. 211 // 212 // Note in particular that if an implicit exception-specification is generated 213 // for a function containing a throw-expression, that specification can still 214 // be noexcept(true). 215 // 216 // Note also that 'directly invoked' is not defined in the standard, and there 217 // is no indication that we should only consider potentially-evaluated calls. 218 // 219 // Ultimately we should implement the intent of the standard: the exception 220 // specification should be the set of exceptions which can be thrown by the 221 // implicit definition. For now, we assume that any non-nothrow expression can 222 // throw any exception. 223 224 if (Self->canThrow(E)) 225 ComputedEST = EST_None; 226} 227 228bool 229Sema::SetParamDefaultArgument(ParmVarDecl *Param, Expr *Arg, 230 SourceLocation EqualLoc) { 231 if (RequireCompleteType(Param->getLocation(), Param->getType(), 232 diag::err_typecheck_decl_incomplete_type)) { 233 Param->setInvalidDecl(); 234 return true; 235 } 236 237 // C++ [dcl.fct.default]p5 238 // A default argument expression is implicitly converted (clause 239 // 4) to the parameter type. The default argument expression has 240 // the same semantic constraints as the initializer expression in 241 // a declaration of a variable of the parameter type, using the 242 // copy-initialization semantics (8.5). 243 InitializedEntity Entity = InitializedEntity::InitializeParameter(Context, 244 Param); 245 InitializationKind Kind = InitializationKind::CreateCopy(Param->getLocation(), 246 EqualLoc); 247 InitializationSequence InitSeq(*this, Entity, Kind, &Arg, 1); 248 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 249 MultiExprArg(*this, &Arg, 1)); 250 if (Result.isInvalid()) 251 return true; 252 Arg = Result.takeAs<Expr>(); 253 254 CheckImplicitConversions(Arg, EqualLoc); 255 Arg = MaybeCreateExprWithCleanups(Arg); 256 257 // Okay: add the default argument to the parameter 258 Param->setDefaultArg(Arg); 259 260 // We have already instantiated this parameter; provide each of the 261 // instantiations with the uninstantiated default argument. 262 UnparsedDefaultArgInstantiationsMap::iterator InstPos 263 = UnparsedDefaultArgInstantiations.find(Param); 264 if (InstPos != UnparsedDefaultArgInstantiations.end()) { 265 for (unsigned I = 0, N = InstPos->second.size(); I != N; ++I) 266 InstPos->second[I]->setUninstantiatedDefaultArg(Arg); 267 268 // We're done tracking this parameter's instantiations. 269 UnparsedDefaultArgInstantiations.erase(InstPos); 270 } 271 272 return false; 273} 274 275/// ActOnParamDefaultArgument - Check whether the default argument 276/// provided for a function parameter is well-formed. If so, attach it 277/// to the parameter declaration. 278void 279Sema::ActOnParamDefaultArgument(Decl *param, SourceLocation EqualLoc, 280 Expr *DefaultArg) { 281 if (!param || !DefaultArg) 282 return; 283 284 ParmVarDecl *Param = cast<ParmVarDecl>(param); 285 UnparsedDefaultArgLocs.erase(Param); 286 287 // Default arguments are only permitted in C++ 288 if (!getLangOpts().CPlusPlus) { 289 Diag(EqualLoc, diag::err_param_default_argument) 290 << DefaultArg->getSourceRange(); 291 Param->setInvalidDecl(); 292 return; 293 } 294 295 // Check for unexpanded parameter packs. 296 if (DiagnoseUnexpandedParameterPack(DefaultArg, UPPC_DefaultArgument)) { 297 Param->setInvalidDecl(); 298 return; 299 } 300 301 // Check that the default argument is well-formed 302 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg, this); 303 if (DefaultArgChecker.Visit(DefaultArg)) { 304 Param->setInvalidDecl(); 305 return; 306 } 307 308 SetParamDefaultArgument(Param, DefaultArg, EqualLoc); 309} 310 311/// ActOnParamUnparsedDefaultArgument - We've seen a default 312/// argument for a function parameter, but we can't parse it yet 313/// because we're inside a class definition. Note that this default 314/// argument will be parsed later. 315void Sema::ActOnParamUnparsedDefaultArgument(Decl *param, 316 SourceLocation EqualLoc, 317 SourceLocation ArgLoc) { 318 if (!param) 319 return; 320 321 ParmVarDecl *Param = cast<ParmVarDecl>(param); 322 if (Param) 323 Param->setUnparsedDefaultArg(); 324 325 UnparsedDefaultArgLocs[Param] = ArgLoc; 326} 327 328/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 329/// the default argument for the parameter param failed. 330void Sema::ActOnParamDefaultArgumentError(Decl *param) { 331 if (!param) 332 return; 333 334 ParmVarDecl *Param = cast<ParmVarDecl>(param); 335 336 Param->setInvalidDecl(); 337 338 UnparsedDefaultArgLocs.erase(Param); 339} 340 341/// CheckExtraCXXDefaultArguments - Check for any extra default 342/// arguments in the declarator, which is not a function declaration 343/// or definition and therefore is not permitted to have default 344/// arguments. This routine should be invoked for every declarator 345/// that is not a function declaration or definition. 346void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 347 // C++ [dcl.fct.default]p3 348 // A default argument expression shall be specified only in the 349 // parameter-declaration-clause of a function declaration or in a 350 // template-parameter (14.1). It shall not be specified for a 351 // parameter pack. If it is specified in a 352 // parameter-declaration-clause, it shall not occur within a 353 // declarator or abstract-declarator of a parameter-declaration. 354 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 355 DeclaratorChunk &chunk = D.getTypeObject(i); 356 if (chunk.Kind == DeclaratorChunk::Function) { 357 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 358 ParmVarDecl *Param = 359 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param); 360 if (Param->hasUnparsedDefaultArg()) { 361 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 362 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 363 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); 364 delete Toks; 365 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 366 } else if (Param->getDefaultArg()) { 367 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 368 << Param->getDefaultArg()->getSourceRange(); 369 Param->setDefaultArg(0); 370 } 371 } 372 } 373 } 374} 375 376// MergeCXXFunctionDecl - Merge two declarations of the same C++ 377// function, once we already know that they have the same 378// type. Subroutine of MergeFunctionDecl. Returns true if there was an 379// error, false otherwise. 380bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old, 381 Scope *S) { 382 bool Invalid = false; 383 384 // C++ [dcl.fct.default]p4: 385 // For non-template functions, default arguments can be added in 386 // later declarations of a function in the same 387 // scope. Declarations in different scopes have completely 388 // distinct sets of default arguments. That is, declarations in 389 // inner scopes do not acquire default arguments from 390 // declarations in outer scopes, and vice versa. In a given 391 // function declaration, all parameters subsequent to a 392 // parameter with a default argument shall have default 393 // arguments supplied in this or previous declarations. A 394 // default argument shall not be redefined by a later 395 // declaration (not even to the same value). 396 // 397 // C++ [dcl.fct.default]p6: 398 // Except for member functions of class templates, the default arguments 399 // in a member function definition that appears outside of the class 400 // definition are added to the set of default arguments provided by the 401 // member function declaration in the class definition. 402 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 403 ParmVarDecl *OldParam = Old->getParamDecl(p); 404 ParmVarDecl *NewParam = New->getParamDecl(p); 405 406 bool OldParamHasDfl = OldParam->hasDefaultArg(); 407 bool NewParamHasDfl = NewParam->hasDefaultArg(); 408 409 NamedDecl *ND = Old; 410 if (S && !isDeclInScope(ND, New->getDeclContext(), S)) 411 // Ignore default parameters of old decl if they are not in 412 // the same scope. 413 OldParamHasDfl = false; 414 415 if (OldParamHasDfl && NewParamHasDfl) { 416 417 unsigned DiagDefaultParamID = 418 diag::err_param_default_argument_redefinition; 419 420 // MSVC accepts that default parameters be redefined for member functions 421 // of template class. The new default parameter's value is ignored. 422 Invalid = true; 423 if (getLangOpts().MicrosoftExt) { 424 CXXMethodDecl* MD = dyn_cast<CXXMethodDecl>(New); 425 if (MD && MD->getParent()->getDescribedClassTemplate()) { 426 // Merge the old default argument into the new parameter. 427 NewParam->setHasInheritedDefaultArg(); 428 if (OldParam->hasUninstantiatedDefaultArg()) 429 NewParam->setUninstantiatedDefaultArg( 430 OldParam->getUninstantiatedDefaultArg()); 431 else 432 NewParam->setDefaultArg(OldParam->getInit()); 433 DiagDefaultParamID = diag::warn_param_default_argument_redefinition; 434 Invalid = false; 435 } 436 } 437 438 // FIXME: If we knew where the '=' was, we could easily provide a fix-it 439 // hint here. Alternatively, we could walk the type-source information 440 // for NewParam to find the last source location in the type... but it 441 // isn't worth the effort right now. This is the kind of test case that 442 // is hard to get right: 443 // int f(int); 444 // void g(int (*fp)(int) = f); 445 // void g(int (*fp)(int) = &f); 446 Diag(NewParam->getLocation(), DiagDefaultParamID) 447 << NewParam->getDefaultArgRange(); 448 449 // Look for the function declaration where the default argument was 450 // actually written, which may be a declaration prior to Old. 451 for (FunctionDecl *Older = Old->getPreviousDecl(); 452 Older; Older = Older->getPreviousDecl()) { 453 if (!Older->getParamDecl(p)->hasDefaultArg()) 454 break; 455 456 OldParam = Older->getParamDecl(p); 457 } 458 459 Diag(OldParam->getLocation(), diag::note_previous_definition) 460 << OldParam->getDefaultArgRange(); 461 } else if (OldParamHasDfl) { 462 // Merge the old default argument into the new parameter. 463 // It's important to use getInit() here; getDefaultArg() 464 // strips off any top-level ExprWithCleanups. 465 NewParam->setHasInheritedDefaultArg(); 466 if (OldParam->hasUninstantiatedDefaultArg()) 467 NewParam->setUninstantiatedDefaultArg( 468 OldParam->getUninstantiatedDefaultArg()); 469 else 470 NewParam->setDefaultArg(OldParam->getInit()); 471 } else if (NewParamHasDfl) { 472 if (New->getDescribedFunctionTemplate()) { 473 // Paragraph 4, quoted above, only applies to non-template functions. 474 Diag(NewParam->getLocation(), 475 diag::err_param_default_argument_template_redecl) 476 << NewParam->getDefaultArgRange(); 477 Diag(Old->getLocation(), diag::note_template_prev_declaration) 478 << false; 479 } else if (New->getTemplateSpecializationKind() 480 != TSK_ImplicitInstantiation && 481 New->getTemplateSpecializationKind() != TSK_Undeclared) { 482 // C++ [temp.expr.spec]p21: 483 // Default function arguments shall not be specified in a declaration 484 // or a definition for one of the following explicit specializations: 485 // - the explicit specialization of a function template; 486 // - the explicit specialization of a member function template; 487 // - the explicit specialization of a member function of a class 488 // template where the class template specialization to which the 489 // member function specialization belongs is implicitly 490 // instantiated. 491 Diag(NewParam->getLocation(), diag::err_template_spec_default_arg) 492 << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization) 493 << New->getDeclName() 494 << NewParam->getDefaultArgRange(); 495 } else if (New->getDeclContext()->isDependentContext()) { 496 // C++ [dcl.fct.default]p6 (DR217): 497 // Default arguments for a member function of a class template shall 498 // be specified on the initial declaration of the member function 499 // within the class template. 500 // 501 // Reading the tea leaves a bit in DR217 and its reference to DR205 502 // leads me to the conclusion that one cannot add default function 503 // arguments for an out-of-line definition of a member function of a 504 // dependent type. 505 int WhichKind = 2; 506 if (CXXRecordDecl *Record 507 = dyn_cast<CXXRecordDecl>(New->getDeclContext())) { 508 if (Record->getDescribedClassTemplate()) 509 WhichKind = 0; 510 else if (isa<ClassTemplatePartialSpecializationDecl>(Record)) 511 WhichKind = 1; 512 else 513 WhichKind = 2; 514 } 515 516 Diag(NewParam->getLocation(), 517 diag::err_param_default_argument_member_template_redecl) 518 << WhichKind 519 << NewParam->getDefaultArgRange(); 520 } else if (CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(New)) { 521 CXXSpecialMember NewSM = getSpecialMember(Ctor), 522 OldSM = getSpecialMember(cast<CXXConstructorDecl>(Old)); 523 if (NewSM != OldSM) { 524 Diag(NewParam->getLocation(),diag::warn_default_arg_makes_ctor_special) 525 << NewParam->getDefaultArgRange() << NewSM; 526 Diag(Old->getLocation(), diag::note_previous_declaration_special) 527 << OldSM; 528 } 529 } 530 } 531 } 532 533 // C++11 [dcl.constexpr]p1: If any declaration of a function or function 534 // template has a constexpr specifier then all its declarations shall 535 // contain the constexpr specifier. 536 if (New->isConstexpr() != Old->isConstexpr()) { 537 Diag(New->getLocation(), diag::err_constexpr_redecl_mismatch) 538 << New << New->isConstexpr(); 539 Diag(Old->getLocation(), diag::note_previous_declaration); 540 Invalid = true; 541 } 542 543 if (CheckEquivalentExceptionSpec(Old, New)) 544 Invalid = true; 545 546 return Invalid; 547} 548 549/// \brief Merge the exception specifications of two variable declarations. 550/// 551/// This is called when there's a redeclaration of a VarDecl. The function 552/// checks if the redeclaration might have an exception specification and 553/// validates compatibility and merges the specs if necessary. 554void Sema::MergeVarDeclExceptionSpecs(VarDecl *New, VarDecl *Old) { 555 // Shortcut if exceptions are disabled. 556 if (!getLangOpts().CXXExceptions) 557 return; 558 559 assert(Context.hasSameType(New->getType(), Old->getType()) && 560 "Should only be called if types are otherwise the same."); 561 562 QualType NewType = New->getType(); 563 QualType OldType = Old->getType(); 564 565 // We're only interested in pointers and references to functions, as well 566 // as pointers to member functions. 567 if (const ReferenceType *R = NewType->getAs<ReferenceType>()) { 568 NewType = R->getPointeeType(); 569 OldType = OldType->getAs<ReferenceType>()->getPointeeType(); 570 } else if (const PointerType *P = NewType->getAs<PointerType>()) { 571 NewType = P->getPointeeType(); 572 OldType = OldType->getAs<PointerType>()->getPointeeType(); 573 } else if (const MemberPointerType *M = NewType->getAs<MemberPointerType>()) { 574 NewType = M->getPointeeType(); 575 OldType = OldType->getAs<MemberPointerType>()->getPointeeType(); 576 } 577 578 if (!NewType->isFunctionProtoType()) 579 return; 580 581 // There's lots of special cases for functions. For function pointers, system 582 // libraries are hopefully not as broken so that we don't need these 583 // workarounds. 584 if (CheckEquivalentExceptionSpec( 585 OldType->getAs<FunctionProtoType>(), Old->getLocation(), 586 NewType->getAs<FunctionProtoType>(), New->getLocation())) { 587 New->setInvalidDecl(); 588 } 589} 590 591/// CheckCXXDefaultArguments - Verify that the default arguments for a 592/// function declaration are well-formed according to C++ 593/// [dcl.fct.default]. 594void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 595 unsigned NumParams = FD->getNumParams(); 596 unsigned p; 597 598 bool IsLambda = FD->getOverloadedOperator() == OO_Call && 599 isa<CXXMethodDecl>(FD) && 600 cast<CXXMethodDecl>(FD)->getParent()->isLambda(); 601 602 // Find first parameter with a default argument 603 for (p = 0; p < NumParams; ++p) { 604 ParmVarDecl *Param = FD->getParamDecl(p); 605 if (Param->hasDefaultArg()) { 606 // C++11 [expr.prim.lambda]p5: 607 // [...] Default arguments (8.3.6) shall not be specified in the 608 // parameter-declaration-clause of a lambda-declarator. 609 // 610 // FIXME: Core issue 974 strikes this sentence, we only provide an 611 // extension warning. 612 if (IsLambda) 613 Diag(Param->getLocation(), diag::ext_lambda_default_arguments) 614 << Param->getDefaultArgRange(); 615 break; 616 } 617 } 618 619 // C++ [dcl.fct.default]p4: 620 // In a given function declaration, all parameters 621 // subsequent to a parameter with a default argument shall 622 // have default arguments supplied in this or previous 623 // declarations. A default argument shall not be redefined 624 // by a later declaration (not even to the same value). 625 unsigned LastMissingDefaultArg = 0; 626 for (; p < NumParams; ++p) { 627 ParmVarDecl *Param = FD->getParamDecl(p); 628 if (!Param->hasDefaultArg()) { 629 if (Param->isInvalidDecl()) 630 /* We already complained about this parameter. */; 631 else if (Param->getIdentifier()) 632 Diag(Param->getLocation(), 633 diag::err_param_default_argument_missing_name) 634 << Param->getIdentifier(); 635 else 636 Diag(Param->getLocation(), 637 diag::err_param_default_argument_missing); 638 639 LastMissingDefaultArg = p; 640 } 641 } 642 643 if (LastMissingDefaultArg > 0) { 644 // Some default arguments were missing. Clear out all of the 645 // default arguments up to (and including) the last missing 646 // default argument, so that we leave the function parameters 647 // in a semantically valid state. 648 for (p = 0; p <= LastMissingDefaultArg; ++p) { 649 ParmVarDecl *Param = FD->getParamDecl(p); 650 if (Param->hasDefaultArg()) { 651 Param->setDefaultArg(0); 652 } 653 } 654 } 655} 656 657// CheckConstexprParameterTypes - Check whether a function's parameter types 658// are all literal types. If so, return true. If not, produce a suitable 659// diagnostic and return false. 660static bool CheckConstexprParameterTypes(Sema &SemaRef, 661 const FunctionDecl *FD) { 662 unsigned ArgIndex = 0; 663 const FunctionProtoType *FT = FD->getType()->getAs<FunctionProtoType>(); 664 for (FunctionProtoType::arg_type_iterator i = FT->arg_type_begin(), 665 e = FT->arg_type_end(); i != e; ++i, ++ArgIndex) { 666 const ParmVarDecl *PD = FD->getParamDecl(ArgIndex); 667 SourceLocation ParamLoc = PD->getLocation(); 668 if (!(*i)->isDependentType() && 669 SemaRef.RequireLiteralType(ParamLoc, *i, 670 diag::err_constexpr_non_literal_param, 671 ArgIndex+1, PD->getSourceRange(), 672 isa<CXXConstructorDecl>(FD))) 673 return false; 674 } 675 return true; 676} 677 678// CheckConstexprFunctionDecl - Check whether a function declaration satisfies 679// the requirements of a constexpr function definition or a constexpr 680// constructor definition. If so, return true. If not, produce appropriate 681// diagnostics and return false. 682// 683// This implements C++11 [dcl.constexpr]p3,4, as amended by DR1360. 684bool Sema::CheckConstexprFunctionDecl(const FunctionDecl *NewFD) { 685 const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewFD); 686 if (MD && MD->isInstance()) { 687 // C++11 [dcl.constexpr]p4: 688 // The definition of a constexpr constructor shall satisfy the following 689 // constraints: 690 // - the class shall not have any virtual base classes; 691 const CXXRecordDecl *RD = MD->getParent(); 692 if (RD->getNumVBases()) { 693 Diag(NewFD->getLocation(), diag::err_constexpr_virtual_base) 694 << isa<CXXConstructorDecl>(NewFD) << RD->isStruct() 695 << RD->getNumVBases(); 696 for (CXXRecordDecl::base_class_const_iterator I = RD->vbases_begin(), 697 E = RD->vbases_end(); I != E; ++I) 698 Diag(I->getLocStart(), 699 diag::note_constexpr_virtual_base_here) << I->getSourceRange(); 700 return false; 701 } 702 } 703 704 if (!isa<CXXConstructorDecl>(NewFD)) { 705 // C++11 [dcl.constexpr]p3: 706 // The definition of a constexpr function shall satisfy the following 707 // constraints: 708 // - it shall not be virtual; 709 const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD); 710 if (Method && Method->isVirtual()) { 711 Diag(NewFD->getLocation(), diag::err_constexpr_virtual); 712 713 // If it's not obvious why this function is virtual, find an overridden 714 // function which uses the 'virtual' keyword. 715 const CXXMethodDecl *WrittenVirtual = Method; 716 while (!WrittenVirtual->isVirtualAsWritten()) 717 WrittenVirtual = *WrittenVirtual->begin_overridden_methods(); 718 if (WrittenVirtual != Method) 719 Diag(WrittenVirtual->getLocation(), 720 diag::note_overridden_virtual_function); 721 return false; 722 } 723 724 // - its return type shall be a literal type; 725 QualType RT = NewFD->getResultType(); 726 if (!RT->isDependentType() && 727 RequireLiteralType(NewFD->getLocation(), RT, 728 diag::err_constexpr_non_literal_return)) 729 return false; 730 } 731 732 // - each of its parameter types shall be a literal type; 733 if (!CheckConstexprParameterTypes(*this, NewFD)) 734 return false; 735 736 return true; 737} 738 739/// Check the given declaration statement is legal within a constexpr function 740/// body. C++0x [dcl.constexpr]p3,p4. 741/// 742/// \return true if the body is OK, false if we have diagnosed a problem. 743static bool CheckConstexprDeclStmt(Sema &SemaRef, const FunctionDecl *Dcl, 744 DeclStmt *DS) { 745 // C++0x [dcl.constexpr]p3 and p4: 746 // The definition of a constexpr function(p3) or constructor(p4) [...] shall 747 // contain only 748 for (DeclStmt::decl_iterator DclIt = DS->decl_begin(), 749 DclEnd = DS->decl_end(); DclIt != DclEnd; ++DclIt) { 750 switch ((*DclIt)->getKind()) { 751 case Decl::StaticAssert: 752 case Decl::Using: 753 case Decl::UsingShadow: 754 case Decl::UsingDirective: 755 case Decl::UnresolvedUsingTypename: 756 // - static_assert-declarations 757 // - using-declarations, 758 // - using-directives, 759 continue; 760 761 case Decl::Typedef: 762 case Decl::TypeAlias: { 763 // - typedef declarations and alias-declarations that do not define 764 // classes or enumerations, 765 TypedefNameDecl *TN = cast<TypedefNameDecl>(*DclIt); 766 if (TN->getUnderlyingType()->isVariablyModifiedType()) { 767 // Don't allow variably-modified types in constexpr functions. 768 TypeLoc TL = TN->getTypeSourceInfo()->getTypeLoc(); 769 SemaRef.Diag(TL.getBeginLoc(), diag::err_constexpr_vla) 770 << TL.getSourceRange() << TL.getType() 771 << isa<CXXConstructorDecl>(Dcl); 772 return false; 773 } 774 continue; 775 } 776 777 case Decl::Enum: 778 case Decl::CXXRecord: 779 // As an extension, we allow the declaration (but not the definition) of 780 // classes and enumerations in all declarations, not just in typedef and 781 // alias declarations. 782 if (cast<TagDecl>(*DclIt)->isThisDeclarationADefinition()) { 783 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_type_definition) 784 << isa<CXXConstructorDecl>(Dcl); 785 return false; 786 } 787 continue; 788 789 case Decl::Var: 790 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_var_declaration) 791 << isa<CXXConstructorDecl>(Dcl); 792 return false; 793 794 default: 795 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_body_invalid_stmt) 796 << isa<CXXConstructorDecl>(Dcl); 797 return false; 798 } 799 } 800 801 return true; 802} 803 804/// Check that the given field is initialized within a constexpr constructor. 805/// 806/// \param Dcl The constexpr constructor being checked. 807/// \param Field The field being checked. This may be a member of an anonymous 808/// struct or union nested within the class being checked. 809/// \param Inits All declarations, including anonymous struct/union members and 810/// indirect members, for which any initialization was provided. 811/// \param Diagnosed Set to true if an error is produced. 812static void CheckConstexprCtorInitializer(Sema &SemaRef, 813 const FunctionDecl *Dcl, 814 FieldDecl *Field, 815 llvm::SmallSet<Decl*, 16> &Inits, 816 bool &Diagnosed) { 817 if (Field->isUnnamedBitfield()) 818 return; 819 820 if (Field->isAnonymousStructOrUnion() && 821 Field->getType()->getAsCXXRecordDecl()->isEmpty()) 822 return; 823 824 if (!Inits.count(Field)) { 825 if (!Diagnosed) { 826 SemaRef.Diag(Dcl->getLocation(), diag::err_constexpr_ctor_missing_init); 827 Diagnosed = true; 828 } 829 SemaRef.Diag(Field->getLocation(), diag::note_constexpr_ctor_missing_init); 830 } else if (Field->isAnonymousStructOrUnion()) { 831 const RecordDecl *RD = Field->getType()->castAs<RecordType>()->getDecl(); 832 for (RecordDecl::field_iterator I = RD->field_begin(), E = RD->field_end(); 833 I != E; ++I) 834 // If an anonymous union contains an anonymous struct of which any member 835 // is initialized, all members must be initialized. 836 if (!RD->isUnion() || Inits.count(*I)) 837 CheckConstexprCtorInitializer(SemaRef, Dcl, *I, Inits, Diagnosed); 838 } 839} 840 841/// Check the body for the given constexpr function declaration only contains 842/// the permitted types of statement. C++11 [dcl.constexpr]p3,p4. 843/// 844/// \return true if the body is OK, false if we have diagnosed a problem. 845bool Sema::CheckConstexprFunctionBody(const FunctionDecl *Dcl, Stmt *Body) { 846 if (isa<CXXTryStmt>(Body)) { 847 // C++11 [dcl.constexpr]p3: 848 // The definition of a constexpr function shall satisfy the following 849 // constraints: [...] 850 // - its function-body shall be = delete, = default, or a 851 // compound-statement 852 // 853 // C++11 [dcl.constexpr]p4: 854 // In the definition of a constexpr constructor, [...] 855 // - its function-body shall not be a function-try-block; 856 Diag(Body->getLocStart(), diag::err_constexpr_function_try_block) 857 << isa<CXXConstructorDecl>(Dcl); 858 return false; 859 } 860 861 // - its function-body shall be [...] a compound-statement that contains only 862 CompoundStmt *CompBody = cast<CompoundStmt>(Body); 863 864 llvm::SmallVector<SourceLocation, 4> ReturnStmts; 865 for (CompoundStmt::body_iterator BodyIt = CompBody->body_begin(), 866 BodyEnd = CompBody->body_end(); BodyIt != BodyEnd; ++BodyIt) { 867 switch ((*BodyIt)->getStmtClass()) { 868 case Stmt::NullStmtClass: 869 // - null statements, 870 continue; 871 872 case Stmt::DeclStmtClass: 873 // - static_assert-declarations 874 // - using-declarations, 875 // - using-directives, 876 // - typedef declarations and alias-declarations that do not define 877 // classes or enumerations, 878 if (!CheckConstexprDeclStmt(*this, Dcl, cast<DeclStmt>(*BodyIt))) 879 return false; 880 continue; 881 882 case Stmt::ReturnStmtClass: 883 // - and exactly one return statement; 884 if (isa<CXXConstructorDecl>(Dcl)) 885 break; 886 887 ReturnStmts.push_back((*BodyIt)->getLocStart()); 888 continue; 889 890 default: 891 break; 892 } 893 894 Diag((*BodyIt)->getLocStart(), diag::err_constexpr_body_invalid_stmt) 895 << isa<CXXConstructorDecl>(Dcl); 896 return false; 897 } 898 899 if (const CXXConstructorDecl *Constructor 900 = dyn_cast<CXXConstructorDecl>(Dcl)) { 901 const CXXRecordDecl *RD = Constructor->getParent(); 902 // DR1359: 903 // - every non-variant non-static data member and base class sub-object 904 // shall be initialized; 905 // - if the class is a non-empty union, or for each non-empty anonymous 906 // union member of a non-union class, exactly one non-static data member 907 // shall be initialized; 908 if (RD->isUnion()) { 909 if (Constructor->getNumCtorInitializers() == 0 && !RD->isEmpty()) { 910 Diag(Dcl->getLocation(), diag::err_constexpr_union_ctor_no_init); 911 return false; 912 } 913 } else if (!Constructor->isDependentContext() && 914 !Constructor->isDelegatingConstructor()) { 915 assert(RD->getNumVBases() == 0 && "constexpr ctor with virtual bases"); 916 917 // Skip detailed checking if we have enough initializers, and we would 918 // allow at most one initializer per member. 919 bool AnyAnonStructUnionMembers = false; 920 unsigned Fields = 0; 921 for (CXXRecordDecl::field_iterator I = RD->field_begin(), 922 E = RD->field_end(); I != E; ++I, ++Fields) { 923 if (I->isAnonymousStructOrUnion()) { 924 AnyAnonStructUnionMembers = true; 925 break; 926 } 927 } 928 if (AnyAnonStructUnionMembers || 929 Constructor->getNumCtorInitializers() != RD->getNumBases() + Fields) { 930 // Check initialization of non-static data members. Base classes are 931 // always initialized so do not need to be checked. Dependent bases 932 // might not have initializers in the member initializer list. 933 llvm::SmallSet<Decl*, 16> Inits; 934 for (CXXConstructorDecl::init_const_iterator 935 I = Constructor->init_begin(), E = Constructor->init_end(); 936 I != E; ++I) { 937 if (FieldDecl *FD = (*I)->getMember()) 938 Inits.insert(FD); 939 else if (IndirectFieldDecl *ID = (*I)->getIndirectMember()) 940 Inits.insert(ID->chain_begin(), ID->chain_end()); 941 } 942 943 bool Diagnosed = false; 944 for (CXXRecordDecl::field_iterator I = RD->field_begin(), 945 E = RD->field_end(); I != E; ++I) 946 CheckConstexprCtorInitializer(*this, Dcl, *I, Inits, Diagnosed); 947 if (Diagnosed) 948 return false; 949 } 950 } 951 } else { 952 if (ReturnStmts.empty()) { 953 Diag(Dcl->getLocation(), diag::err_constexpr_body_no_return); 954 return false; 955 } 956 if (ReturnStmts.size() > 1) { 957 Diag(ReturnStmts.back(), diag::err_constexpr_body_multiple_return); 958 for (unsigned I = 0; I < ReturnStmts.size() - 1; ++I) 959 Diag(ReturnStmts[I], diag::note_constexpr_body_previous_return); 960 return false; 961 } 962 } 963 964 // C++11 [dcl.constexpr]p5: 965 // if no function argument values exist such that the function invocation 966 // substitution would produce a constant expression, the program is 967 // ill-formed; no diagnostic required. 968 // C++11 [dcl.constexpr]p3: 969 // - every constructor call and implicit conversion used in initializing the 970 // return value shall be one of those allowed in a constant expression. 971 // C++11 [dcl.constexpr]p4: 972 // - every constructor involved in initializing non-static data members and 973 // base class sub-objects shall be a constexpr constructor. 974 llvm::SmallVector<PartialDiagnosticAt, 8> Diags; 975 if (!Expr::isPotentialConstantExpr(Dcl, Diags)) { 976 Diag(Dcl->getLocation(), diag::err_constexpr_function_never_constant_expr) 977 << isa<CXXConstructorDecl>(Dcl); 978 for (size_t I = 0, N = Diags.size(); I != N; ++I) 979 Diag(Diags[I].first, Diags[I].second); 980 return false; 981 } 982 983 return true; 984} 985 986/// isCurrentClassName - Determine whether the identifier II is the 987/// name of the class type currently being defined. In the case of 988/// nested classes, this will only return true if II is the name of 989/// the innermost class. 990bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 991 const CXXScopeSpec *SS) { 992 assert(getLangOpts().CPlusPlus && "No class names in C!"); 993 994 CXXRecordDecl *CurDecl; 995 if (SS && SS->isSet() && !SS->isInvalid()) { 996 DeclContext *DC = computeDeclContext(*SS, true); 997 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 998 } else 999 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 1000 1001 if (CurDecl && CurDecl->getIdentifier()) 1002 return &II == CurDecl->getIdentifier(); 1003 else 1004 return false; 1005} 1006 1007/// \brief Check the validity of a C++ base class specifier. 1008/// 1009/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 1010/// and returns NULL otherwise. 1011CXXBaseSpecifier * 1012Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 1013 SourceRange SpecifierRange, 1014 bool Virtual, AccessSpecifier Access, 1015 TypeSourceInfo *TInfo, 1016 SourceLocation EllipsisLoc) { 1017 QualType BaseType = TInfo->getType(); 1018 1019 // C++ [class.union]p1: 1020 // A union shall not have base classes. 1021 if (Class->isUnion()) { 1022 Diag(Class->getLocation(), diag::err_base_clause_on_union) 1023 << SpecifierRange; 1024 return 0; 1025 } 1026 1027 if (EllipsisLoc.isValid() && 1028 !TInfo->getType()->containsUnexpandedParameterPack()) { 1029 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 1030 << TInfo->getTypeLoc().getSourceRange(); 1031 EllipsisLoc = SourceLocation(); 1032 } 1033 1034 if (BaseType->isDependentType()) 1035 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 1036 Class->getTagKind() == TTK_Class, 1037 Access, TInfo, EllipsisLoc); 1038 1039 SourceLocation BaseLoc = TInfo->getTypeLoc().getBeginLoc(); 1040 1041 // Base specifiers must be record types. 1042 if (!BaseType->isRecordType()) { 1043 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 1044 return 0; 1045 } 1046 1047 // C++ [class.union]p1: 1048 // A union shall not be used as a base class. 1049 if (BaseType->isUnionType()) { 1050 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 1051 return 0; 1052 } 1053 1054 // C++ [class.derived]p2: 1055 // The class-name in a base-specifier shall not be an incompletely 1056 // defined class. 1057 if (RequireCompleteType(BaseLoc, BaseType, 1058 diag::err_incomplete_base_class, SpecifierRange)) { 1059 Class->setInvalidDecl(); 1060 return 0; 1061 } 1062 1063 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 1064 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 1065 assert(BaseDecl && "Record type has no declaration"); 1066 BaseDecl = BaseDecl->getDefinition(); 1067 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 1068 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 1069 assert(CXXBaseDecl && "Base type is not a C++ type"); 1070 1071 // C++ [class]p3: 1072 // If a class is marked final and it appears as a base-type-specifier in 1073 // base-clause, the program is ill-formed. 1074 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 1075 Diag(BaseLoc, diag::err_class_marked_final_used_as_base) 1076 << CXXBaseDecl->getDeclName(); 1077 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 1078 << CXXBaseDecl->getDeclName(); 1079 return 0; 1080 } 1081 1082 if (BaseDecl->isInvalidDecl()) 1083 Class->setInvalidDecl(); 1084 1085 // Create the base specifier. 1086 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 1087 Class->getTagKind() == TTK_Class, 1088 Access, TInfo, EllipsisLoc); 1089} 1090 1091/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 1092/// one entry in the base class list of a class specifier, for 1093/// example: 1094/// class foo : public bar, virtual private baz { 1095/// 'public bar' and 'virtual private baz' are each base-specifiers. 1096BaseResult 1097Sema::ActOnBaseSpecifier(Decl *classdecl, SourceRange SpecifierRange, 1098 bool Virtual, AccessSpecifier Access, 1099 ParsedType basetype, SourceLocation BaseLoc, 1100 SourceLocation EllipsisLoc) { 1101 if (!classdecl) 1102 return true; 1103 1104 AdjustDeclIfTemplate(classdecl); 1105 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl); 1106 if (!Class) 1107 return true; 1108 1109 TypeSourceInfo *TInfo = 0; 1110 GetTypeFromParser(basetype, &TInfo); 1111 1112 if (EllipsisLoc.isInvalid() && 1113 DiagnoseUnexpandedParameterPack(SpecifierRange.getBegin(), TInfo, 1114 UPPC_BaseType)) 1115 return true; 1116 1117 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 1118 Virtual, Access, TInfo, 1119 EllipsisLoc)) 1120 return BaseSpec; 1121 1122 return true; 1123} 1124 1125/// \brief Performs the actual work of attaching the given base class 1126/// specifiers to a C++ class. 1127bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 1128 unsigned NumBases) { 1129 if (NumBases == 0) 1130 return false; 1131 1132 // Used to keep track of which base types we have already seen, so 1133 // that we can properly diagnose redundant direct base types. Note 1134 // that the key is always the unqualified canonical type of the base 1135 // class. 1136 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 1137 1138 // Copy non-redundant base specifiers into permanent storage. 1139 unsigned NumGoodBases = 0; 1140 bool Invalid = false; 1141 for (unsigned idx = 0; idx < NumBases; ++idx) { 1142 QualType NewBaseType 1143 = Context.getCanonicalType(Bases[idx]->getType()); 1144 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 1145 1146 CXXBaseSpecifier *&KnownBase = KnownBaseTypes[NewBaseType]; 1147 if (KnownBase) { 1148 // C++ [class.mi]p3: 1149 // A class shall not be specified as a direct base class of a 1150 // derived class more than once. 1151 Diag(Bases[idx]->getLocStart(), 1152 diag::err_duplicate_base_class) 1153 << KnownBase->getType() 1154 << Bases[idx]->getSourceRange(); 1155 1156 // Delete the duplicate base class specifier; we're going to 1157 // overwrite its pointer later. 1158 Context.Deallocate(Bases[idx]); 1159 1160 Invalid = true; 1161 } else { 1162 // Okay, add this new base class. 1163 KnownBase = Bases[idx]; 1164 Bases[NumGoodBases++] = Bases[idx]; 1165 if (const RecordType *Record = NewBaseType->getAs<RecordType>()) 1166 if (const CXXRecordDecl *RD = cast<CXXRecordDecl>(Record->getDecl())) 1167 if (RD->hasAttr<WeakAttr>()) 1168 Class->addAttr(::new (Context) WeakAttr(SourceRange(), Context)); 1169 } 1170 } 1171 1172 // Attach the remaining base class specifiers to the derived class. 1173 Class->setBases(Bases, NumGoodBases); 1174 1175 // Delete the remaining (good) base class specifiers, since their 1176 // data has been copied into the CXXRecordDecl. 1177 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 1178 Context.Deallocate(Bases[idx]); 1179 1180 return Invalid; 1181} 1182 1183/// ActOnBaseSpecifiers - Attach the given base specifiers to the 1184/// class, after checking whether there are any duplicate base 1185/// classes. 1186void Sema::ActOnBaseSpecifiers(Decl *ClassDecl, CXXBaseSpecifier **Bases, 1187 unsigned NumBases) { 1188 if (!ClassDecl || !Bases || !NumBases) 1189 return; 1190 1191 AdjustDeclIfTemplate(ClassDecl); 1192 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl), 1193 (CXXBaseSpecifier**)(Bases), NumBases); 1194} 1195 1196static CXXRecordDecl *GetClassForType(QualType T) { 1197 if (const RecordType *RT = T->getAs<RecordType>()) 1198 return cast<CXXRecordDecl>(RT->getDecl()); 1199 else if (const InjectedClassNameType *ICT = T->getAs<InjectedClassNameType>()) 1200 return ICT->getDecl(); 1201 else 1202 return 0; 1203} 1204 1205/// \brief Determine whether the type \p Derived is a C++ class that is 1206/// derived from the type \p Base. 1207bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 1208 if (!getLangOpts().CPlusPlus) 1209 return false; 1210 1211 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 1212 if (!DerivedRD) 1213 return false; 1214 1215 CXXRecordDecl *BaseRD = GetClassForType(Base); 1216 if (!BaseRD) 1217 return false; 1218 1219 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 1220 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 1221} 1222 1223/// \brief Determine whether the type \p Derived is a C++ class that is 1224/// derived from the type \p Base. 1225bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 1226 if (!getLangOpts().CPlusPlus) 1227 return false; 1228 1229 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 1230 if (!DerivedRD) 1231 return false; 1232 1233 CXXRecordDecl *BaseRD = GetClassForType(Base); 1234 if (!BaseRD) 1235 return false; 1236 1237 return DerivedRD->isDerivedFrom(BaseRD, Paths); 1238} 1239 1240void Sema::BuildBasePathArray(const CXXBasePaths &Paths, 1241 CXXCastPath &BasePathArray) { 1242 assert(BasePathArray.empty() && "Base path array must be empty!"); 1243 assert(Paths.isRecordingPaths() && "Must record paths!"); 1244 1245 const CXXBasePath &Path = Paths.front(); 1246 1247 // We first go backward and check if we have a virtual base. 1248 // FIXME: It would be better if CXXBasePath had the base specifier for 1249 // the nearest virtual base. 1250 unsigned Start = 0; 1251 for (unsigned I = Path.size(); I != 0; --I) { 1252 if (Path[I - 1].Base->isVirtual()) { 1253 Start = I - 1; 1254 break; 1255 } 1256 } 1257 1258 // Now add all bases. 1259 for (unsigned I = Start, E = Path.size(); I != E; ++I) 1260 BasePathArray.push_back(const_cast<CXXBaseSpecifier*>(Path[I].Base)); 1261} 1262 1263/// \brief Determine whether the given base path includes a virtual 1264/// base class. 1265bool Sema::BasePathInvolvesVirtualBase(const CXXCastPath &BasePath) { 1266 for (CXXCastPath::const_iterator B = BasePath.begin(), 1267 BEnd = BasePath.end(); 1268 B != BEnd; ++B) 1269 if ((*B)->isVirtual()) 1270 return true; 1271 1272 return false; 1273} 1274 1275/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 1276/// conversion (where Derived and Base are class types) is 1277/// well-formed, meaning that the conversion is unambiguous (and 1278/// that all of the base classes are accessible). Returns true 1279/// and emits a diagnostic if the code is ill-formed, returns false 1280/// otherwise. Loc is the location where this routine should point to 1281/// if there is an error, and Range is the source range to highlight 1282/// if there is an error. 1283bool 1284Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 1285 unsigned InaccessibleBaseID, 1286 unsigned AmbigiousBaseConvID, 1287 SourceLocation Loc, SourceRange Range, 1288 DeclarationName Name, 1289 CXXCastPath *BasePath) { 1290 // First, determine whether the path from Derived to Base is 1291 // ambiguous. This is slightly more expensive than checking whether 1292 // the Derived to Base conversion exists, because here we need to 1293 // explore multiple paths to determine if there is an ambiguity. 1294 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1295 /*DetectVirtual=*/false); 1296 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 1297 assert(DerivationOkay && 1298 "Can only be used with a derived-to-base conversion"); 1299 (void)DerivationOkay; 1300 1301 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 1302 if (InaccessibleBaseID) { 1303 // Check that the base class can be accessed. 1304 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(), 1305 InaccessibleBaseID)) { 1306 case AR_inaccessible: 1307 return true; 1308 case AR_accessible: 1309 case AR_dependent: 1310 case AR_delayed: 1311 break; 1312 } 1313 } 1314 1315 // Build a base path if necessary. 1316 if (BasePath) 1317 BuildBasePathArray(Paths, *BasePath); 1318 return false; 1319 } 1320 1321 // We know that the derived-to-base conversion is ambiguous, and 1322 // we're going to produce a diagnostic. Perform the derived-to-base 1323 // search just one more time to compute all of the possible paths so 1324 // that we can print them out. This is more expensive than any of 1325 // the previous derived-to-base checks we've done, but at this point 1326 // performance isn't as much of an issue. 1327 Paths.clear(); 1328 Paths.setRecordingPaths(true); 1329 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 1330 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 1331 (void)StillOkay; 1332 1333 // Build up a textual representation of the ambiguous paths, e.g., 1334 // D -> B -> A, that will be used to illustrate the ambiguous 1335 // conversions in the diagnostic. We only print one of the paths 1336 // to each base class subobject. 1337 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 1338 1339 Diag(Loc, AmbigiousBaseConvID) 1340 << Derived << Base << PathDisplayStr << Range << Name; 1341 return true; 1342} 1343 1344bool 1345Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 1346 SourceLocation Loc, SourceRange Range, 1347 CXXCastPath *BasePath, 1348 bool IgnoreAccess) { 1349 return CheckDerivedToBaseConversion(Derived, Base, 1350 IgnoreAccess ? 0 1351 : diag::err_upcast_to_inaccessible_base, 1352 diag::err_ambiguous_derived_to_base_conv, 1353 Loc, Range, DeclarationName(), 1354 BasePath); 1355} 1356 1357 1358/// @brief Builds a string representing ambiguous paths from a 1359/// specific derived class to different subobjects of the same base 1360/// class. 1361/// 1362/// This function builds a string that can be used in error messages 1363/// to show the different paths that one can take through the 1364/// inheritance hierarchy to go from the derived class to different 1365/// subobjects of a base class. The result looks something like this: 1366/// @code 1367/// struct D -> struct B -> struct A 1368/// struct D -> struct C -> struct A 1369/// @endcode 1370std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 1371 std::string PathDisplayStr; 1372 std::set<unsigned> DisplayedPaths; 1373 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1374 Path != Paths.end(); ++Path) { 1375 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 1376 // We haven't displayed a path to this particular base 1377 // class subobject yet. 1378 PathDisplayStr += "\n "; 1379 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 1380 for (CXXBasePath::const_iterator Element = Path->begin(); 1381 Element != Path->end(); ++Element) 1382 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 1383 } 1384 } 1385 1386 return PathDisplayStr; 1387} 1388 1389//===----------------------------------------------------------------------===// 1390// C++ class member Handling 1391//===----------------------------------------------------------------------===// 1392 1393/// ActOnAccessSpecifier - Parsed an access specifier followed by a colon. 1394bool Sema::ActOnAccessSpecifier(AccessSpecifier Access, 1395 SourceLocation ASLoc, 1396 SourceLocation ColonLoc, 1397 AttributeList *Attrs) { 1398 assert(Access != AS_none && "Invalid kind for syntactic access specifier!"); 1399 AccessSpecDecl *ASDecl = AccessSpecDecl::Create(Context, Access, CurContext, 1400 ASLoc, ColonLoc); 1401 CurContext->addHiddenDecl(ASDecl); 1402 return ProcessAccessDeclAttributeList(ASDecl, Attrs); 1403} 1404 1405/// CheckOverrideControl - Check C++0x override control semantics. 1406void Sema::CheckOverrideControl(const Decl *D) { 1407 const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D); 1408 if (!MD || !MD->isVirtual()) 1409 return; 1410 1411 if (MD->isDependentContext()) 1412 return; 1413 1414 // C++0x [class.virtual]p3: 1415 // If a virtual function is marked with the virt-specifier override and does 1416 // not override a member function of a base class, 1417 // the program is ill-formed. 1418 bool HasOverriddenMethods = 1419 MD->begin_overridden_methods() != MD->end_overridden_methods(); 1420 if (MD->hasAttr<OverrideAttr>() && !HasOverriddenMethods) { 1421 Diag(MD->getLocation(), 1422 diag::err_function_marked_override_not_overriding) 1423 << MD->getDeclName(); 1424 return; 1425 } 1426} 1427 1428/// CheckIfOverriddenFunctionIsMarkedFinal - Checks whether a virtual member 1429/// function overrides a virtual member function marked 'final', according to 1430/// C++0x [class.virtual]p3. 1431bool Sema::CheckIfOverriddenFunctionIsMarkedFinal(const CXXMethodDecl *New, 1432 const CXXMethodDecl *Old) { 1433 if (!Old->hasAttr<FinalAttr>()) 1434 return false; 1435 1436 Diag(New->getLocation(), diag::err_final_function_overridden) 1437 << New->getDeclName(); 1438 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 1439 return true; 1440} 1441 1442static bool InitializationHasSideEffects(const FieldDecl &FD) { 1443 if (!FD.getType().isNull()) { 1444 if (const CXXRecordDecl *RD = FD.getType()->getAsCXXRecordDecl()) { 1445 return !RD->isCompleteDefinition() || 1446 !RD->hasTrivialDefaultConstructor() || 1447 !RD->hasTrivialDestructor(); 1448 } 1449 } 1450 return false; 1451} 1452 1453/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 1454/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 1455/// bitfield width if there is one, 'InitExpr' specifies the initializer if 1456/// one has been parsed, and 'InitStyle' is set if an in-class initializer is 1457/// present (but parsing it has been deferred). 1458Decl * 1459Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 1460 MultiTemplateParamsArg TemplateParameterLists, 1461 Expr *BW, const VirtSpecifiers &VS, 1462 InClassInitStyle InitStyle) { 1463 const DeclSpec &DS = D.getDeclSpec(); 1464 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 1465 DeclarationName Name = NameInfo.getName(); 1466 SourceLocation Loc = NameInfo.getLoc(); 1467 1468 // For anonymous bitfields, the location should point to the type. 1469 if (Loc.isInvalid()) 1470 Loc = D.getLocStart(); 1471 1472 Expr *BitWidth = static_cast<Expr*>(BW); 1473 1474 assert(isa<CXXRecordDecl>(CurContext)); 1475 assert(!DS.isFriendSpecified()); 1476 1477 bool isFunc = D.isDeclarationOfFunction(); 1478 1479 // C++ 9.2p6: A member shall not be declared to have automatic storage 1480 // duration (auto, register) or with the extern storage-class-specifier. 1481 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 1482 // data members and cannot be applied to names declared const or static, 1483 // and cannot be applied to reference members. 1484 switch (DS.getStorageClassSpec()) { 1485 case DeclSpec::SCS_unspecified: 1486 case DeclSpec::SCS_typedef: 1487 case DeclSpec::SCS_static: 1488 // FALL THROUGH. 1489 break; 1490 case DeclSpec::SCS_mutable: 1491 if (isFunc) { 1492 if (DS.getStorageClassSpecLoc().isValid()) 1493 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 1494 else 1495 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 1496 1497 // FIXME: It would be nicer if the keyword was ignored only for this 1498 // declarator. Otherwise we could get follow-up errors. 1499 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1500 } 1501 break; 1502 default: 1503 if (DS.getStorageClassSpecLoc().isValid()) 1504 Diag(DS.getStorageClassSpecLoc(), 1505 diag::err_storageclass_invalid_for_member); 1506 else 1507 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 1508 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1509 } 1510 1511 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 1512 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 1513 !isFunc); 1514 1515 Decl *Member; 1516 if (isInstField) { 1517 CXXScopeSpec &SS = D.getCXXScopeSpec(); 1518 1519 // Data members must have identifiers for names. 1520 if (!Name.isIdentifier()) { 1521 Diag(Loc, diag::err_bad_variable_name) 1522 << Name; 1523 return 0; 1524 } 1525 1526 IdentifierInfo *II = Name.getAsIdentifierInfo(); 1527 1528 // Member field could not be with "template" keyword. 1529 // So TemplateParameterLists should be empty in this case. 1530 if (TemplateParameterLists.size()) { 1531 TemplateParameterList* TemplateParams = TemplateParameterLists.get()[0]; 1532 if (TemplateParams->size()) { 1533 // There is no such thing as a member field template. 1534 Diag(D.getIdentifierLoc(), diag::err_template_member) 1535 << II 1536 << SourceRange(TemplateParams->getTemplateLoc(), 1537 TemplateParams->getRAngleLoc()); 1538 } else { 1539 // There is an extraneous 'template<>' for this member. 1540 Diag(TemplateParams->getTemplateLoc(), 1541 diag::err_template_member_noparams) 1542 << II 1543 << SourceRange(TemplateParams->getTemplateLoc(), 1544 TemplateParams->getRAngleLoc()); 1545 } 1546 return 0; 1547 } 1548 1549 if (SS.isSet() && !SS.isInvalid()) { 1550 // The user provided a superfluous scope specifier inside a class 1551 // definition: 1552 // 1553 // class X { 1554 // int X::member; 1555 // }; 1556 if (DeclContext *DC = computeDeclContext(SS, false)) 1557 diagnoseQualifiedDeclaration(SS, DC, Name, D.getIdentifierLoc()); 1558 else 1559 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 1560 << Name << SS.getRange(); 1561 1562 SS.clear(); 1563 } 1564 1565 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 1566 InitStyle, AS); 1567 assert(Member && "HandleField never returns null"); 1568 } else { 1569 assert(InitStyle == ICIS_NoInit); 1570 1571 Member = HandleDeclarator(S, D, move(TemplateParameterLists)); 1572 if (!Member) { 1573 return 0; 1574 } 1575 1576 // Non-instance-fields can't have a bitfield. 1577 if (BitWidth) { 1578 if (Member->isInvalidDecl()) { 1579 // don't emit another diagnostic. 1580 } else if (isa<VarDecl>(Member)) { 1581 // C++ 9.6p3: A bit-field shall not be a static member. 1582 // "static member 'A' cannot be a bit-field" 1583 Diag(Loc, diag::err_static_not_bitfield) 1584 << Name << BitWidth->getSourceRange(); 1585 } else if (isa<TypedefDecl>(Member)) { 1586 // "typedef member 'x' cannot be a bit-field" 1587 Diag(Loc, diag::err_typedef_not_bitfield) 1588 << Name << BitWidth->getSourceRange(); 1589 } else { 1590 // A function typedef ("typedef int f(); f a;"). 1591 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 1592 Diag(Loc, diag::err_not_integral_type_bitfield) 1593 << Name << cast<ValueDecl>(Member)->getType() 1594 << BitWidth->getSourceRange(); 1595 } 1596 1597 BitWidth = 0; 1598 Member->setInvalidDecl(); 1599 } 1600 1601 Member->setAccess(AS); 1602 1603 // If we have declared a member function template, set the access of the 1604 // templated declaration as well. 1605 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 1606 FunTmpl->getTemplatedDecl()->setAccess(AS); 1607 } 1608 1609 if (VS.isOverrideSpecified()) { 1610 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member); 1611 if (!MD || !MD->isVirtual()) { 1612 Diag(Member->getLocStart(), 1613 diag::override_keyword_only_allowed_on_virtual_member_functions) 1614 << "override" << FixItHint::CreateRemoval(VS.getOverrideLoc()); 1615 } else 1616 MD->addAttr(new (Context) OverrideAttr(VS.getOverrideLoc(), Context)); 1617 } 1618 if (VS.isFinalSpecified()) { 1619 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member); 1620 if (!MD || !MD->isVirtual()) { 1621 Diag(Member->getLocStart(), 1622 diag::override_keyword_only_allowed_on_virtual_member_functions) 1623 << "final" << FixItHint::CreateRemoval(VS.getFinalLoc()); 1624 } else 1625 MD->addAttr(new (Context) FinalAttr(VS.getFinalLoc(), Context)); 1626 } 1627 1628 if (VS.getLastLocation().isValid()) { 1629 // Update the end location of a method that has a virt-specifiers. 1630 if (CXXMethodDecl *MD = dyn_cast_or_null<CXXMethodDecl>(Member)) 1631 MD->setRangeEnd(VS.getLastLocation()); 1632 } 1633 1634 CheckOverrideControl(Member); 1635 1636 assert((Name || isInstField) && "No identifier for non-field ?"); 1637 1638 if (isInstField) { 1639 FieldDecl *FD = cast<FieldDecl>(Member); 1640 FieldCollector->Add(FD); 1641 1642 if (Diags.getDiagnosticLevel(diag::warn_unused_private_field, 1643 FD->getLocation()) 1644 != DiagnosticsEngine::Ignored) { 1645 // Remember all explicit private FieldDecls that have a name, no side 1646 // effects and are not part of a dependent type declaration. 1647 if (!FD->isImplicit() && FD->getDeclName() && 1648 FD->getAccess() == AS_private && 1649 !FD->hasAttr<UnusedAttr>() && 1650 !FD->getParent()->getTypeForDecl()->isDependentType() && 1651 !InitializationHasSideEffects(*FD)) 1652 UnusedPrivateFields.insert(FD); 1653 } 1654 } 1655 1656 return Member; 1657} 1658 1659/// ActOnCXXInClassMemberInitializer - This is invoked after parsing an 1660/// in-class initializer for a non-static C++ class member, and after 1661/// instantiating an in-class initializer in a class template. Such actions 1662/// are deferred until the class is complete. 1663void 1664Sema::ActOnCXXInClassMemberInitializer(Decl *D, SourceLocation InitLoc, 1665 Expr *InitExpr) { 1666 FieldDecl *FD = cast<FieldDecl>(D); 1667 assert(FD->getInClassInitStyle() != ICIS_NoInit && 1668 "must set init style when field is created"); 1669 1670 if (!InitExpr) { 1671 FD->setInvalidDecl(); 1672 FD->removeInClassInitializer(); 1673 return; 1674 } 1675 1676 if (DiagnoseUnexpandedParameterPack(InitExpr, UPPC_Initializer)) { 1677 FD->setInvalidDecl(); 1678 FD->removeInClassInitializer(); 1679 return; 1680 } 1681 1682 ExprResult Init = InitExpr; 1683 if (!FD->getType()->isDependentType() && !InitExpr->isTypeDependent()) { 1684 if (isa<InitListExpr>(InitExpr) && isStdInitializerList(FD->getType(), 0)) { 1685 Diag(FD->getLocation(), diag::warn_dangling_std_initializer_list) 1686 << /*at end of ctor*/1 << InitExpr->getSourceRange(); 1687 } 1688 Expr **Inits = &InitExpr; 1689 unsigned NumInits = 1; 1690 InitializedEntity Entity = InitializedEntity::InitializeMember(FD); 1691 InitializationKind Kind = FD->getInClassInitStyle() == ICIS_ListInit 1692 ? InitializationKind::CreateDirectList(InitExpr->getLocStart()) 1693 : InitializationKind::CreateCopy(InitExpr->getLocStart(), InitLoc); 1694 InitializationSequence Seq(*this, Entity, Kind, Inits, NumInits); 1695 Init = Seq.Perform(*this, Entity, Kind, MultiExprArg(Inits, NumInits)); 1696 if (Init.isInvalid()) { 1697 FD->setInvalidDecl(); 1698 return; 1699 } 1700 1701 CheckImplicitConversions(Init.get(), InitLoc); 1702 } 1703 1704 // C++0x [class.base.init]p7: 1705 // The initialization of each base and member constitutes a 1706 // full-expression. 1707 Init = MaybeCreateExprWithCleanups(Init); 1708 if (Init.isInvalid()) { 1709 FD->setInvalidDecl(); 1710 return; 1711 } 1712 1713 InitExpr = Init.release(); 1714 1715 FD->setInClassInitializer(InitExpr); 1716} 1717 1718/// \brief Find the direct and/or virtual base specifiers that 1719/// correspond to the given base type, for use in base initialization 1720/// within a constructor. 1721static bool FindBaseInitializer(Sema &SemaRef, 1722 CXXRecordDecl *ClassDecl, 1723 QualType BaseType, 1724 const CXXBaseSpecifier *&DirectBaseSpec, 1725 const CXXBaseSpecifier *&VirtualBaseSpec) { 1726 // First, check for a direct base class. 1727 DirectBaseSpec = 0; 1728 for (CXXRecordDecl::base_class_const_iterator Base 1729 = ClassDecl->bases_begin(); 1730 Base != ClassDecl->bases_end(); ++Base) { 1731 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 1732 // We found a direct base of this type. That's what we're 1733 // initializing. 1734 DirectBaseSpec = &*Base; 1735 break; 1736 } 1737 } 1738 1739 // Check for a virtual base class. 1740 // FIXME: We might be able to short-circuit this if we know in advance that 1741 // there are no virtual bases. 1742 VirtualBaseSpec = 0; 1743 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 1744 // We haven't found a base yet; search the class hierarchy for a 1745 // virtual base class. 1746 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1747 /*DetectVirtual=*/false); 1748 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 1749 BaseType, Paths)) { 1750 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1751 Path != Paths.end(); ++Path) { 1752 if (Path->back().Base->isVirtual()) { 1753 VirtualBaseSpec = Path->back().Base; 1754 break; 1755 } 1756 } 1757 } 1758 } 1759 1760 return DirectBaseSpec || VirtualBaseSpec; 1761} 1762 1763/// \brief Handle a C++ member initializer using braced-init-list syntax. 1764MemInitResult 1765Sema::ActOnMemInitializer(Decl *ConstructorD, 1766 Scope *S, 1767 CXXScopeSpec &SS, 1768 IdentifierInfo *MemberOrBase, 1769 ParsedType TemplateTypeTy, 1770 const DeclSpec &DS, 1771 SourceLocation IdLoc, 1772 Expr *InitList, 1773 SourceLocation EllipsisLoc) { 1774 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy, 1775 DS, IdLoc, InitList, 1776 EllipsisLoc); 1777} 1778 1779/// \brief Handle a C++ member initializer using parentheses syntax. 1780MemInitResult 1781Sema::ActOnMemInitializer(Decl *ConstructorD, 1782 Scope *S, 1783 CXXScopeSpec &SS, 1784 IdentifierInfo *MemberOrBase, 1785 ParsedType TemplateTypeTy, 1786 const DeclSpec &DS, 1787 SourceLocation IdLoc, 1788 SourceLocation LParenLoc, 1789 Expr **Args, unsigned NumArgs, 1790 SourceLocation RParenLoc, 1791 SourceLocation EllipsisLoc) { 1792 Expr *List = new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1793 RParenLoc); 1794 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy, 1795 DS, IdLoc, List, EllipsisLoc); 1796} 1797 1798namespace { 1799 1800// Callback to only accept typo corrections that can be a valid C++ member 1801// intializer: either a non-static field member or a base class. 1802class MemInitializerValidatorCCC : public CorrectionCandidateCallback { 1803 public: 1804 explicit MemInitializerValidatorCCC(CXXRecordDecl *ClassDecl) 1805 : ClassDecl(ClassDecl) {} 1806 1807 virtual bool ValidateCandidate(const TypoCorrection &candidate) { 1808 if (NamedDecl *ND = candidate.getCorrectionDecl()) { 1809 if (FieldDecl *Member = dyn_cast<FieldDecl>(ND)) 1810 return Member->getDeclContext()->getRedeclContext()->Equals(ClassDecl); 1811 else 1812 return isa<TypeDecl>(ND); 1813 } 1814 return false; 1815 } 1816 1817 private: 1818 CXXRecordDecl *ClassDecl; 1819}; 1820 1821} 1822 1823/// \brief Handle a C++ member initializer. 1824MemInitResult 1825Sema::BuildMemInitializer(Decl *ConstructorD, 1826 Scope *S, 1827 CXXScopeSpec &SS, 1828 IdentifierInfo *MemberOrBase, 1829 ParsedType TemplateTypeTy, 1830 const DeclSpec &DS, 1831 SourceLocation IdLoc, 1832 Expr *Init, 1833 SourceLocation EllipsisLoc) { 1834 if (!ConstructorD) 1835 return true; 1836 1837 AdjustDeclIfTemplate(ConstructorD); 1838 1839 CXXConstructorDecl *Constructor 1840 = dyn_cast<CXXConstructorDecl>(ConstructorD); 1841 if (!Constructor) { 1842 // The user wrote a constructor initializer on a function that is 1843 // not a C++ constructor. Ignore the error for now, because we may 1844 // have more member initializers coming; we'll diagnose it just 1845 // once in ActOnMemInitializers. 1846 return true; 1847 } 1848 1849 CXXRecordDecl *ClassDecl = Constructor->getParent(); 1850 1851 // C++ [class.base.init]p2: 1852 // Names in a mem-initializer-id are looked up in the scope of the 1853 // constructor's class and, if not found in that scope, are looked 1854 // up in the scope containing the constructor's definition. 1855 // [Note: if the constructor's class contains a member with the 1856 // same name as a direct or virtual base class of the class, a 1857 // mem-initializer-id naming the member or base class and composed 1858 // of a single identifier refers to the class member. A 1859 // mem-initializer-id for the hidden base class may be specified 1860 // using a qualified name. ] 1861 if (!SS.getScopeRep() && !TemplateTypeTy) { 1862 // Look for a member, first. 1863 DeclContext::lookup_result Result 1864 = ClassDecl->lookup(MemberOrBase); 1865 if (Result.first != Result.second) { 1866 ValueDecl *Member; 1867 if ((Member = dyn_cast<FieldDecl>(*Result.first)) || 1868 (Member = dyn_cast<IndirectFieldDecl>(*Result.first))) { 1869 if (EllipsisLoc.isValid()) 1870 Diag(EllipsisLoc, diag::err_pack_expansion_member_init) 1871 << MemberOrBase 1872 << SourceRange(IdLoc, Init->getSourceRange().getEnd()); 1873 1874 return BuildMemberInitializer(Member, Init, IdLoc); 1875 } 1876 } 1877 } 1878 // It didn't name a member, so see if it names a class. 1879 QualType BaseType; 1880 TypeSourceInfo *TInfo = 0; 1881 1882 if (TemplateTypeTy) { 1883 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 1884 } else if (DS.getTypeSpecType() == TST_decltype) { 1885 BaseType = BuildDecltypeType(DS.getRepAsExpr(), DS.getTypeSpecTypeLoc()); 1886 } else { 1887 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 1888 LookupParsedName(R, S, &SS); 1889 1890 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 1891 if (!TyD) { 1892 if (R.isAmbiguous()) return true; 1893 1894 // We don't want access-control diagnostics here. 1895 R.suppressDiagnostics(); 1896 1897 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 1898 bool NotUnknownSpecialization = false; 1899 DeclContext *DC = computeDeclContext(SS, false); 1900 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 1901 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 1902 1903 if (!NotUnknownSpecialization) { 1904 // When the scope specifier can refer to a member of an unknown 1905 // specialization, we take it as a type name. 1906 BaseType = CheckTypenameType(ETK_None, SourceLocation(), 1907 SS.getWithLocInContext(Context), 1908 *MemberOrBase, IdLoc); 1909 if (BaseType.isNull()) 1910 return true; 1911 1912 R.clear(); 1913 R.setLookupName(MemberOrBase); 1914 } 1915 } 1916 1917 // If no results were found, try to correct typos. 1918 TypoCorrection Corr; 1919 MemInitializerValidatorCCC Validator(ClassDecl); 1920 if (R.empty() && BaseType.isNull() && 1921 (Corr = CorrectTypo(R.getLookupNameInfo(), R.getLookupKind(), S, &SS, 1922 Validator, ClassDecl))) { 1923 std::string CorrectedStr(Corr.getAsString(getLangOpts())); 1924 std::string CorrectedQuotedStr(Corr.getQuoted(getLangOpts())); 1925 if (FieldDecl *Member = Corr.getCorrectionDeclAs<FieldDecl>()) { 1926 // We have found a non-static data member with a similar 1927 // name to what was typed; complain and initialize that 1928 // member. 1929 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1930 << MemberOrBase << true << CorrectedQuotedStr 1931 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr); 1932 Diag(Member->getLocation(), diag::note_previous_decl) 1933 << CorrectedQuotedStr; 1934 1935 return BuildMemberInitializer(Member, Init, IdLoc); 1936 } else if (TypeDecl *Type = Corr.getCorrectionDeclAs<TypeDecl>()) { 1937 const CXXBaseSpecifier *DirectBaseSpec; 1938 const CXXBaseSpecifier *VirtualBaseSpec; 1939 if (FindBaseInitializer(*this, ClassDecl, 1940 Context.getTypeDeclType(Type), 1941 DirectBaseSpec, VirtualBaseSpec)) { 1942 // We have found a direct or virtual base class with a 1943 // similar name to what was typed; complain and initialize 1944 // that base class. 1945 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1946 << MemberOrBase << false << CorrectedQuotedStr 1947 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr); 1948 1949 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 1950 : VirtualBaseSpec; 1951 Diag(BaseSpec->getLocStart(), 1952 diag::note_base_class_specified_here) 1953 << BaseSpec->getType() 1954 << BaseSpec->getSourceRange(); 1955 1956 TyD = Type; 1957 } 1958 } 1959 } 1960 1961 if (!TyD && BaseType.isNull()) { 1962 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1963 << MemberOrBase << SourceRange(IdLoc,Init->getSourceRange().getEnd()); 1964 return true; 1965 } 1966 } 1967 1968 if (BaseType.isNull()) { 1969 BaseType = Context.getTypeDeclType(TyD); 1970 if (SS.isSet()) { 1971 NestedNameSpecifier *Qualifier = 1972 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1973 1974 // FIXME: preserve source range information 1975 BaseType = Context.getElaboratedType(ETK_None, Qualifier, BaseType); 1976 } 1977 } 1978 } 1979 1980 if (!TInfo) 1981 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 1982 1983 return BuildBaseInitializer(BaseType, TInfo, Init, ClassDecl, EllipsisLoc); 1984} 1985 1986/// Checks a member initializer expression for cases where reference (or 1987/// pointer) members are bound to by-value parameters (or their addresses). 1988static void CheckForDanglingReferenceOrPointer(Sema &S, ValueDecl *Member, 1989 Expr *Init, 1990 SourceLocation IdLoc) { 1991 QualType MemberTy = Member->getType(); 1992 1993 // We only handle pointers and references currently. 1994 // FIXME: Would this be relevant for ObjC object pointers? Or block pointers? 1995 if (!MemberTy->isReferenceType() && !MemberTy->isPointerType()) 1996 return; 1997 1998 const bool IsPointer = MemberTy->isPointerType(); 1999 if (IsPointer) { 2000 if (const UnaryOperator *Op 2001 = dyn_cast<UnaryOperator>(Init->IgnoreParenImpCasts())) { 2002 // The only case we're worried about with pointers requires taking the 2003 // address. 2004 if (Op->getOpcode() != UO_AddrOf) 2005 return; 2006 2007 Init = Op->getSubExpr(); 2008 } else { 2009 // We only handle address-of expression initializers for pointers. 2010 return; 2011 } 2012 } 2013 2014 if (isa<MaterializeTemporaryExpr>(Init->IgnoreParens())) { 2015 // Taking the address of a temporary will be diagnosed as a hard error. 2016 if (IsPointer) 2017 return; 2018 2019 S.Diag(Init->getExprLoc(), diag::warn_bind_ref_member_to_temporary) 2020 << Member << Init->getSourceRange(); 2021 } else if (const DeclRefExpr *DRE 2022 = dyn_cast<DeclRefExpr>(Init->IgnoreParens())) { 2023 // We only warn when referring to a non-reference parameter declaration. 2024 const ParmVarDecl *Parameter = dyn_cast<ParmVarDecl>(DRE->getDecl()); 2025 if (!Parameter || Parameter->getType()->isReferenceType()) 2026 return; 2027 2028 S.Diag(Init->getExprLoc(), 2029 IsPointer ? diag::warn_init_ptr_member_to_parameter_addr 2030 : diag::warn_bind_ref_member_to_parameter) 2031 << Member << Parameter << Init->getSourceRange(); 2032 } else { 2033 // Other initializers are fine. 2034 return; 2035 } 2036 2037 S.Diag(Member->getLocation(), diag::note_ref_or_ptr_member_declared_here) 2038 << (unsigned)IsPointer; 2039} 2040 2041/// Checks an initializer expression for use of uninitialized fields, such as 2042/// containing the field that is being initialized. Returns true if there is an 2043/// uninitialized field was used an updates the SourceLocation parameter; false 2044/// otherwise. 2045static bool InitExprContainsUninitializedFields(const Stmt *S, 2046 const ValueDecl *LhsField, 2047 SourceLocation *L) { 2048 assert(isa<FieldDecl>(LhsField) || isa<IndirectFieldDecl>(LhsField)); 2049 2050 if (isa<CallExpr>(S)) { 2051 // Do not descend into function calls or constructors, as the use 2052 // of an uninitialized field may be valid. One would have to inspect 2053 // the contents of the function/ctor to determine if it is safe or not. 2054 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 2055 // may be safe, depending on what the function/ctor does. 2056 return false; 2057 } 2058 if (const MemberExpr *ME = dyn_cast<MemberExpr>(S)) { 2059 const NamedDecl *RhsField = ME->getMemberDecl(); 2060 2061 if (const VarDecl *VD = dyn_cast<VarDecl>(RhsField)) { 2062 // The member expression points to a static data member. 2063 assert(VD->isStaticDataMember() && 2064 "Member points to non-static data member!"); 2065 (void)VD; 2066 return false; 2067 } 2068 2069 if (isa<EnumConstantDecl>(RhsField)) { 2070 // The member expression points to an enum. 2071 return false; 2072 } 2073 2074 if (RhsField == LhsField) { 2075 // Initializing a field with itself. Throw a warning. 2076 // But wait; there are exceptions! 2077 // Exception #1: The field may not belong to this record. 2078 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 2079 const Expr *base = ME->getBase(); 2080 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 2081 // Even though the field matches, it does not belong to this record. 2082 return false; 2083 } 2084 // None of the exceptions triggered; return true to indicate an 2085 // uninitialized field was used. 2086 *L = ME->getMemberLoc(); 2087 return true; 2088 } 2089 } else if (isa<UnaryExprOrTypeTraitExpr>(S)) { 2090 // sizeof/alignof doesn't reference contents, do not warn. 2091 return false; 2092 } else if (const UnaryOperator *UOE = dyn_cast<UnaryOperator>(S)) { 2093 // address-of doesn't reference contents (the pointer may be dereferenced 2094 // in the same expression but it would be rare; and weird). 2095 if (UOE->getOpcode() == UO_AddrOf) 2096 return false; 2097 } 2098 for (Stmt::const_child_range it = S->children(); it; ++it) { 2099 if (!*it) { 2100 // An expression such as 'member(arg ?: "")' may trigger this. 2101 continue; 2102 } 2103 if (InitExprContainsUninitializedFields(*it, LhsField, L)) 2104 return true; 2105 } 2106 return false; 2107} 2108 2109MemInitResult 2110Sema::BuildMemberInitializer(ValueDecl *Member, Expr *Init, 2111 SourceLocation IdLoc) { 2112 FieldDecl *DirectMember = dyn_cast<FieldDecl>(Member); 2113 IndirectFieldDecl *IndirectMember = dyn_cast<IndirectFieldDecl>(Member); 2114 assert((DirectMember || IndirectMember) && 2115 "Member must be a FieldDecl or IndirectFieldDecl"); 2116 2117 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) 2118 return true; 2119 2120 if (Member->isInvalidDecl()) 2121 return true; 2122 2123 // Diagnose value-uses of fields to initialize themselves, e.g. 2124 // foo(foo) 2125 // where foo is not also a parameter to the constructor. 2126 // TODO: implement -Wuninitialized and fold this into that framework. 2127 Expr **Args; 2128 unsigned NumArgs; 2129 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { 2130 Args = ParenList->getExprs(); 2131 NumArgs = ParenList->getNumExprs(); 2132 } else { 2133 InitListExpr *InitList = cast<InitListExpr>(Init); 2134 Args = InitList->getInits(); 2135 NumArgs = InitList->getNumInits(); 2136 } 2137 2138 // Mark FieldDecl as being used if it is a non-primitive type and the 2139 // initializer does not call the default constructor (which is trivial 2140 // for all entries in UnusedPrivateFields). 2141 // FIXME: Make this smarter once more side effect-free types can be 2142 // determined. 2143 if (NumArgs > 0) { 2144 if (Member->getType()->isRecordType()) { 2145 UnusedPrivateFields.remove(Member); 2146 } else { 2147 for (unsigned i = 0; i < NumArgs; ++i) { 2148 if (Args[i]->HasSideEffects(Context)) { 2149 UnusedPrivateFields.remove(Member); 2150 break; 2151 } 2152 } 2153 } 2154 } 2155 2156 for (unsigned i = 0; i < NumArgs; ++i) { 2157 SourceLocation L; 2158 if (InitExprContainsUninitializedFields(Args[i], Member, &L)) { 2159 // FIXME: Return true in the case when other fields are used before being 2160 // uninitialized. For example, let this field be the i'th field. When 2161 // initializing the i'th field, throw a warning if any of the >= i'th 2162 // fields are used, as they are not yet initialized. 2163 // Right now we are only handling the case where the i'th field uses 2164 // itself in its initializer. 2165 Diag(L, diag::warn_field_is_uninit); 2166 } 2167 } 2168 2169 SourceRange InitRange = Init->getSourceRange(); 2170 2171 if (Member->getType()->isDependentType() || Init->isTypeDependent()) { 2172 // Can't check initialization for a member of dependent type or when 2173 // any of the arguments are type-dependent expressions. 2174 DiscardCleanupsInEvaluationContext(); 2175 } else { 2176 bool InitList = false; 2177 if (isa<InitListExpr>(Init)) { 2178 InitList = true; 2179 Args = &Init; 2180 NumArgs = 1; 2181 2182 if (isStdInitializerList(Member->getType(), 0)) { 2183 Diag(IdLoc, diag::warn_dangling_std_initializer_list) 2184 << /*at end of ctor*/1 << InitRange; 2185 } 2186 } 2187 2188 // Initialize the member. 2189 InitializedEntity MemberEntity = 2190 DirectMember ? InitializedEntity::InitializeMember(DirectMember, 0) 2191 : InitializedEntity::InitializeMember(IndirectMember, 0); 2192 InitializationKind Kind = 2193 InitList ? InitializationKind::CreateDirectList(IdLoc) 2194 : InitializationKind::CreateDirect(IdLoc, InitRange.getBegin(), 2195 InitRange.getEnd()); 2196 2197 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args, NumArgs); 2198 ExprResult MemberInit = InitSeq.Perform(*this, MemberEntity, Kind, 2199 MultiExprArg(*this, Args, NumArgs), 2200 0); 2201 if (MemberInit.isInvalid()) 2202 return true; 2203 2204 CheckImplicitConversions(MemberInit.get(), 2205 InitRange.getBegin()); 2206 2207 // C++0x [class.base.init]p7: 2208 // The initialization of each base and member constitutes a 2209 // full-expression. 2210 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 2211 if (MemberInit.isInvalid()) 2212 return true; 2213 2214 // If we are in a dependent context, template instantiation will 2215 // perform this type-checking again. Just save the arguments that we 2216 // received. 2217 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2218 // of the information that we have about the member 2219 // initializer. However, deconstructing the ASTs is a dicey process, 2220 // and this approach is far more likely to get the corner cases right. 2221 if (CurContext->isDependentContext()) { 2222 // The existing Init will do fine. 2223 } else { 2224 Init = MemberInit.get(); 2225 CheckForDanglingReferenceOrPointer(*this, Member, Init, IdLoc); 2226 } 2227 } 2228 2229 if (DirectMember) { 2230 return new (Context) CXXCtorInitializer(Context, DirectMember, IdLoc, 2231 InitRange.getBegin(), Init, 2232 InitRange.getEnd()); 2233 } else { 2234 return new (Context) CXXCtorInitializer(Context, IndirectMember, IdLoc, 2235 InitRange.getBegin(), Init, 2236 InitRange.getEnd()); 2237 } 2238} 2239 2240MemInitResult 2241Sema::BuildDelegatingInitializer(TypeSourceInfo *TInfo, Expr *Init, 2242 CXXRecordDecl *ClassDecl) { 2243 SourceLocation NameLoc = TInfo->getTypeLoc().getLocalSourceRange().getBegin(); 2244 if (!LangOpts.CPlusPlus0x) 2245 return Diag(NameLoc, diag::err_delegating_ctor) 2246 << TInfo->getTypeLoc().getLocalSourceRange(); 2247 Diag(NameLoc, diag::warn_cxx98_compat_delegating_ctor); 2248 2249 bool InitList = true; 2250 Expr **Args = &Init; 2251 unsigned NumArgs = 1; 2252 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { 2253 InitList = false; 2254 Args = ParenList->getExprs(); 2255 NumArgs = ParenList->getNumExprs(); 2256 } 2257 2258 SourceRange InitRange = Init->getSourceRange(); 2259 // Initialize the object. 2260 InitializedEntity DelegationEntity = InitializedEntity::InitializeDelegation( 2261 QualType(ClassDecl->getTypeForDecl(), 0)); 2262 InitializationKind Kind = 2263 InitList ? InitializationKind::CreateDirectList(NameLoc) 2264 : InitializationKind::CreateDirect(NameLoc, InitRange.getBegin(), 2265 InitRange.getEnd()); 2266 InitializationSequence InitSeq(*this, DelegationEntity, Kind, Args, NumArgs); 2267 ExprResult DelegationInit = InitSeq.Perform(*this, DelegationEntity, Kind, 2268 MultiExprArg(*this, Args,NumArgs), 2269 0); 2270 if (DelegationInit.isInvalid()) 2271 return true; 2272 2273 assert(cast<CXXConstructExpr>(DelegationInit.get())->getConstructor() && 2274 "Delegating constructor with no target?"); 2275 2276 CheckImplicitConversions(DelegationInit.get(), InitRange.getBegin()); 2277 2278 // C++0x [class.base.init]p7: 2279 // The initialization of each base and member constitutes a 2280 // full-expression. 2281 DelegationInit = MaybeCreateExprWithCleanups(DelegationInit); 2282 if (DelegationInit.isInvalid()) 2283 return true; 2284 2285 // If we are in a dependent context, template instantiation will 2286 // perform this type-checking again. Just save the arguments that we 2287 // received in a ParenListExpr. 2288 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2289 // of the information that we have about the base 2290 // initializer. However, deconstructing the ASTs is a dicey process, 2291 // and this approach is far more likely to get the corner cases right. 2292 if (CurContext->isDependentContext()) 2293 DelegationInit = Owned(Init); 2294 2295 return new (Context) CXXCtorInitializer(Context, TInfo, InitRange.getBegin(), 2296 DelegationInit.takeAs<Expr>(), 2297 InitRange.getEnd()); 2298} 2299 2300MemInitResult 2301Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 2302 Expr *Init, CXXRecordDecl *ClassDecl, 2303 SourceLocation EllipsisLoc) { 2304 SourceLocation BaseLoc 2305 = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); 2306 2307 if (!BaseType->isDependentType() && !BaseType->isRecordType()) 2308 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 2309 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2310 2311 // C++ [class.base.init]p2: 2312 // [...] Unless the mem-initializer-id names a nonstatic data 2313 // member of the constructor's class or a direct or virtual base 2314 // of that class, the mem-initializer is ill-formed. A 2315 // mem-initializer-list can initialize a base class using any 2316 // name that denotes that base class type. 2317 bool Dependent = BaseType->isDependentType() || Init->isTypeDependent(); 2318 2319 SourceRange InitRange = Init->getSourceRange(); 2320 if (EllipsisLoc.isValid()) { 2321 // This is a pack expansion. 2322 if (!BaseType->containsUnexpandedParameterPack()) { 2323 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 2324 << SourceRange(BaseLoc, InitRange.getEnd()); 2325 2326 EllipsisLoc = SourceLocation(); 2327 } 2328 } else { 2329 // Check for any unexpanded parameter packs. 2330 if (DiagnoseUnexpandedParameterPack(BaseLoc, BaseTInfo, UPPC_Initializer)) 2331 return true; 2332 2333 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) 2334 return true; 2335 } 2336 2337 // Check for direct and virtual base classes. 2338 const CXXBaseSpecifier *DirectBaseSpec = 0; 2339 const CXXBaseSpecifier *VirtualBaseSpec = 0; 2340 if (!Dependent) { 2341 if (Context.hasSameUnqualifiedType(QualType(ClassDecl->getTypeForDecl(),0), 2342 BaseType)) 2343 return BuildDelegatingInitializer(BaseTInfo, Init, ClassDecl); 2344 2345 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 2346 VirtualBaseSpec); 2347 2348 // C++ [base.class.init]p2: 2349 // Unless the mem-initializer-id names a nonstatic data member of the 2350 // constructor's class or a direct or virtual base of that class, the 2351 // mem-initializer is ill-formed. 2352 if (!DirectBaseSpec && !VirtualBaseSpec) { 2353 // If the class has any dependent bases, then it's possible that 2354 // one of those types will resolve to the same type as 2355 // BaseType. Therefore, just treat this as a dependent base 2356 // class initialization. FIXME: Should we try to check the 2357 // initialization anyway? It seems odd. 2358 if (ClassDecl->hasAnyDependentBases()) 2359 Dependent = true; 2360 else 2361 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 2362 << BaseType << Context.getTypeDeclType(ClassDecl) 2363 << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2364 } 2365 } 2366 2367 if (Dependent) { 2368 DiscardCleanupsInEvaluationContext(); 2369 2370 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 2371 /*IsVirtual=*/false, 2372 InitRange.getBegin(), Init, 2373 InitRange.getEnd(), EllipsisLoc); 2374 } 2375 2376 // C++ [base.class.init]p2: 2377 // If a mem-initializer-id is ambiguous because it designates both 2378 // a direct non-virtual base class and an inherited virtual base 2379 // class, the mem-initializer is ill-formed. 2380 if (DirectBaseSpec && VirtualBaseSpec) 2381 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 2382 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2383 2384 CXXBaseSpecifier *BaseSpec = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 2385 if (!BaseSpec) 2386 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 2387 2388 // Initialize the base. 2389 bool InitList = true; 2390 Expr **Args = &Init; 2391 unsigned NumArgs = 1; 2392 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { 2393 InitList = false; 2394 Args = ParenList->getExprs(); 2395 NumArgs = ParenList->getNumExprs(); 2396 } 2397 2398 InitializedEntity BaseEntity = 2399 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 2400 InitializationKind Kind = 2401 InitList ? InitializationKind::CreateDirectList(BaseLoc) 2402 : InitializationKind::CreateDirect(BaseLoc, InitRange.getBegin(), 2403 InitRange.getEnd()); 2404 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args, NumArgs); 2405 ExprResult BaseInit = InitSeq.Perform(*this, BaseEntity, Kind, 2406 MultiExprArg(*this, Args, NumArgs), 2407 0); 2408 if (BaseInit.isInvalid()) 2409 return true; 2410 2411 CheckImplicitConversions(BaseInit.get(), InitRange.getBegin()); 2412 2413 // C++0x [class.base.init]p7: 2414 // The initialization of each base and member constitutes a 2415 // full-expression. 2416 BaseInit = MaybeCreateExprWithCleanups(BaseInit); 2417 if (BaseInit.isInvalid()) 2418 return true; 2419 2420 // If we are in a dependent context, template instantiation will 2421 // perform this type-checking again. Just save the arguments that we 2422 // received in a ParenListExpr. 2423 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2424 // of the information that we have about the base 2425 // initializer. However, deconstructing the ASTs is a dicey process, 2426 // and this approach is far more likely to get the corner cases right. 2427 if (CurContext->isDependentContext()) 2428 BaseInit = Owned(Init); 2429 2430 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 2431 BaseSpec->isVirtual(), 2432 InitRange.getBegin(), 2433 BaseInit.takeAs<Expr>(), 2434 InitRange.getEnd(), EllipsisLoc); 2435} 2436 2437// Create a static_cast\<T&&>(expr). 2438static Expr *CastForMoving(Sema &SemaRef, Expr *E) { 2439 QualType ExprType = E->getType(); 2440 QualType TargetType = SemaRef.Context.getRValueReferenceType(ExprType); 2441 SourceLocation ExprLoc = E->getLocStart(); 2442 TypeSourceInfo *TargetLoc = SemaRef.Context.getTrivialTypeSourceInfo( 2443 TargetType, ExprLoc); 2444 2445 return SemaRef.BuildCXXNamedCast(ExprLoc, tok::kw_static_cast, TargetLoc, E, 2446 SourceRange(ExprLoc, ExprLoc), 2447 E->getSourceRange()).take(); 2448} 2449 2450/// ImplicitInitializerKind - How an implicit base or member initializer should 2451/// initialize its base or member. 2452enum ImplicitInitializerKind { 2453 IIK_Default, 2454 IIK_Copy, 2455 IIK_Move 2456}; 2457 2458static bool 2459BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 2460 ImplicitInitializerKind ImplicitInitKind, 2461 CXXBaseSpecifier *BaseSpec, 2462 bool IsInheritedVirtualBase, 2463 CXXCtorInitializer *&CXXBaseInit) { 2464 InitializedEntity InitEntity 2465 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 2466 IsInheritedVirtualBase); 2467 2468 ExprResult BaseInit; 2469 2470 switch (ImplicitInitKind) { 2471 case IIK_Default: { 2472 InitializationKind InitKind 2473 = InitializationKind::CreateDefault(Constructor->getLocation()); 2474 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 2475 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 2476 MultiExprArg(SemaRef, 0, 0)); 2477 break; 2478 } 2479 2480 case IIK_Move: 2481 case IIK_Copy: { 2482 bool Moving = ImplicitInitKind == IIK_Move; 2483 ParmVarDecl *Param = Constructor->getParamDecl(0); 2484 QualType ParamType = Param->getType().getNonReferenceType(); 2485 2486 Expr *CopyCtorArg = 2487 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), 2488 SourceLocation(), Param, false, 2489 Constructor->getLocation(), ParamType, 2490 VK_LValue, 0); 2491 2492 SemaRef.MarkDeclRefReferenced(cast<DeclRefExpr>(CopyCtorArg)); 2493 2494 // Cast to the base class to avoid ambiguities. 2495 QualType ArgTy = 2496 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), 2497 ParamType.getQualifiers()); 2498 2499 if (Moving) { 2500 CopyCtorArg = CastForMoving(SemaRef, CopyCtorArg); 2501 } 2502 2503 CXXCastPath BasePath; 2504 BasePath.push_back(BaseSpec); 2505 CopyCtorArg = SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, 2506 CK_UncheckedDerivedToBase, 2507 Moving ? VK_XValue : VK_LValue, 2508 &BasePath).take(); 2509 2510 InitializationKind InitKind 2511 = InitializationKind::CreateDirect(Constructor->getLocation(), 2512 SourceLocation(), SourceLocation()); 2513 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 2514 &CopyCtorArg, 1); 2515 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 2516 MultiExprArg(&CopyCtorArg, 1)); 2517 break; 2518 } 2519 } 2520 2521 BaseInit = SemaRef.MaybeCreateExprWithCleanups(BaseInit); 2522 if (BaseInit.isInvalid()) 2523 return true; 2524 2525 CXXBaseInit = 2526 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2527 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 2528 SourceLocation()), 2529 BaseSpec->isVirtual(), 2530 SourceLocation(), 2531 BaseInit.takeAs<Expr>(), 2532 SourceLocation(), 2533 SourceLocation()); 2534 2535 return false; 2536} 2537 2538static bool RefersToRValueRef(Expr *MemRef) { 2539 ValueDecl *Referenced = cast<MemberExpr>(MemRef)->getMemberDecl(); 2540 return Referenced->getType()->isRValueReferenceType(); 2541} 2542 2543static bool 2544BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 2545 ImplicitInitializerKind ImplicitInitKind, 2546 FieldDecl *Field, IndirectFieldDecl *Indirect, 2547 CXXCtorInitializer *&CXXMemberInit) { 2548 if (Field->isInvalidDecl()) 2549 return true; 2550 2551 SourceLocation Loc = Constructor->getLocation(); 2552 2553 if (ImplicitInitKind == IIK_Copy || ImplicitInitKind == IIK_Move) { 2554 bool Moving = ImplicitInitKind == IIK_Move; 2555 ParmVarDecl *Param = Constructor->getParamDecl(0); 2556 QualType ParamType = Param->getType().getNonReferenceType(); 2557 2558 // Suppress copying zero-width bitfields. 2559 if (Field->isBitField() && Field->getBitWidthValue(SemaRef.Context) == 0) 2560 return false; 2561 2562 Expr *MemberExprBase = 2563 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), 2564 SourceLocation(), Param, false, 2565 Loc, ParamType, VK_LValue, 0); 2566 2567 SemaRef.MarkDeclRefReferenced(cast<DeclRefExpr>(MemberExprBase)); 2568 2569 if (Moving) { 2570 MemberExprBase = CastForMoving(SemaRef, MemberExprBase); 2571 } 2572 2573 // Build a reference to this field within the parameter. 2574 CXXScopeSpec SS; 2575 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, 2576 Sema::LookupMemberName); 2577 MemberLookup.addDecl(Indirect ? cast<ValueDecl>(Indirect) 2578 : cast<ValueDecl>(Field), AS_public); 2579 MemberLookup.resolveKind(); 2580 ExprResult CtorArg 2581 = SemaRef.BuildMemberReferenceExpr(MemberExprBase, 2582 ParamType, Loc, 2583 /*IsArrow=*/false, 2584 SS, 2585 /*TemplateKWLoc=*/SourceLocation(), 2586 /*FirstQualifierInScope=*/0, 2587 MemberLookup, 2588 /*TemplateArgs=*/0); 2589 if (CtorArg.isInvalid()) 2590 return true; 2591 2592 // C++11 [class.copy]p15: 2593 // - if a member m has rvalue reference type T&&, it is direct-initialized 2594 // with static_cast<T&&>(x.m); 2595 if (RefersToRValueRef(CtorArg.get())) { 2596 CtorArg = CastForMoving(SemaRef, CtorArg.take()); 2597 } 2598 2599 // When the field we are copying is an array, create index variables for 2600 // each dimension of the array. We use these index variables to subscript 2601 // the source array, and other clients (e.g., CodeGen) will perform the 2602 // necessary iteration with these index variables. 2603 SmallVector<VarDecl *, 4> IndexVariables; 2604 QualType BaseType = Field->getType(); 2605 QualType SizeType = SemaRef.Context.getSizeType(); 2606 bool InitializingArray = false; 2607 while (const ConstantArrayType *Array 2608 = SemaRef.Context.getAsConstantArrayType(BaseType)) { 2609 InitializingArray = true; 2610 // Create the iteration variable for this array index. 2611 IdentifierInfo *IterationVarName = 0; 2612 { 2613 SmallString<8> Str; 2614 llvm::raw_svector_ostream OS(Str); 2615 OS << "__i" << IndexVariables.size(); 2616 IterationVarName = &SemaRef.Context.Idents.get(OS.str()); 2617 } 2618 VarDecl *IterationVar 2619 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, Loc, 2620 IterationVarName, SizeType, 2621 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc), 2622 SC_None, SC_None); 2623 IndexVariables.push_back(IterationVar); 2624 2625 // Create a reference to the iteration variable. 2626 ExprResult IterationVarRef 2627 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, VK_LValue, Loc); 2628 assert(!IterationVarRef.isInvalid() && 2629 "Reference to invented variable cannot fail!"); 2630 IterationVarRef = SemaRef.DefaultLvalueConversion(IterationVarRef.take()); 2631 assert(!IterationVarRef.isInvalid() && 2632 "Conversion of invented variable cannot fail!"); 2633 2634 // Subscript the array with this iteration variable. 2635 CtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(CtorArg.take(), Loc, 2636 IterationVarRef.take(), 2637 Loc); 2638 if (CtorArg.isInvalid()) 2639 return true; 2640 2641 BaseType = Array->getElementType(); 2642 } 2643 2644 // The array subscript expression is an lvalue, which is wrong for moving. 2645 if (Moving && InitializingArray) 2646 CtorArg = CastForMoving(SemaRef, CtorArg.take()); 2647 2648 // Construct the entity that we will be initializing. For an array, this 2649 // will be first element in the array, which may require several levels 2650 // of array-subscript entities. 2651 SmallVector<InitializedEntity, 4> Entities; 2652 Entities.reserve(1 + IndexVariables.size()); 2653 if (Indirect) 2654 Entities.push_back(InitializedEntity::InitializeMember(Indirect)); 2655 else 2656 Entities.push_back(InitializedEntity::InitializeMember(Field)); 2657 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I) 2658 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context, 2659 0, 2660 Entities.back())); 2661 2662 // Direct-initialize to use the copy constructor. 2663 InitializationKind InitKind = 2664 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); 2665 2666 Expr *CtorArgE = CtorArg.takeAs<Expr>(); 2667 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, 2668 &CtorArgE, 1); 2669 2670 ExprResult MemberInit 2671 = InitSeq.Perform(SemaRef, Entities.back(), InitKind, 2672 MultiExprArg(&CtorArgE, 1)); 2673 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2674 if (MemberInit.isInvalid()) 2675 return true; 2676 2677 if (Indirect) { 2678 assert(IndexVariables.size() == 0 && 2679 "Indirect field improperly initialized"); 2680 CXXMemberInit 2681 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 2682 Loc, Loc, 2683 MemberInit.takeAs<Expr>(), 2684 Loc); 2685 } else 2686 CXXMemberInit = CXXCtorInitializer::Create(SemaRef.Context, Field, Loc, 2687 Loc, MemberInit.takeAs<Expr>(), 2688 Loc, 2689 IndexVariables.data(), 2690 IndexVariables.size()); 2691 return false; 2692 } 2693 2694 assert(ImplicitInitKind == IIK_Default && "Unhandled implicit init kind!"); 2695 2696 QualType FieldBaseElementType = 2697 SemaRef.Context.getBaseElementType(Field->getType()); 2698 2699 if (FieldBaseElementType->isRecordType()) { 2700 InitializedEntity InitEntity 2701 = Indirect? InitializedEntity::InitializeMember(Indirect) 2702 : InitializedEntity::InitializeMember(Field); 2703 InitializationKind InitKind = 2704 InitializationKind::CreateDefault(Loc); 2705 2706 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 2707 ExprResult MemberInit = 2708 InitSeq.Perform(SemaRef, InitEntity, InitKind, MultiExprArg()); 2709 2710 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2711 if (MemberInit.isInvalid()) 2712 return true; 2713 2714 if (Indirect) 2715 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2716 Indirect, Loc, 2717 Loc, 2718 MemberInit.get(), 2719 Loc); 2720 else 2721 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2722 Field, Loc, Loc, 2723 MemberInit.get(), 2724 Loc); 2725 return false; 2726 } 2727 2728 if (!Field->getParent()->isUnion()) { 2729 if (FieldBaseElementType->isReferenceType()) { 2730 SemaRef.Diag(Constructor->getLocation(), 2731 diag::err_uninitialized_member_in_ctor) 2732 << (int)Constructor->isImplicit() 2733 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2734 << 0 << Field->getDeclName(); 2735 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2736 return true; 2737 } 2738 2739 if (FieldBaseElementType.isConstQualified()) { 2740 SemaRef.Diag(Constructor->getLocation(), 2741 diag::err_uninitialized_member_in_ctor) 2742 << (int)Constructor->isImplicit() 2743 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2744 << 1 << Field->getDeclName(); 2745 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2746 return true; 2747 } 2748 } 2749 2750 if (SemaRef.getLangOpts().ObjCAutoRefCount && 2751 FieldBaseElementType->isObjCRetainableType() && 2752 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_None && 2753 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_ExplicitNone) { 2754 // Instant objects: 2755 // Default-initialize Objective-C pointers to NULL. 2756 CXXMemberInit 2757 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 2758 Loc, Loc, 2759 new (SemaRef.Context) ImplicitValueInitExpr(Field->getType()), 2760 Loc); 2761 return false; 2762 } 2763 2764 // Nothing to initialize. 2765 CXXMemberInit = 0; 2766 return false; 2767} 2768 2769namespace { 2770struct BaseAndFieldInfo { 2771 Sema &S; 2772 CXXConstructorDecl *Ctor; 2773 bool AnyErrorsInInits; 2774 ImplicitInitializerKind IIK; 2775 llvm::DenseMap<const void *, CXXCtorInitializer*> AllBaseFields; 2776 SmallVector<CXXCtorInitializer*, 8> AllToInit; 2777 2778 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) 2779 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { 2780 bool Generated = Ctor->isImplicit() || Ctor->isDefaulted(); 2781 if (Generated && Ctor->isCopyConstructor()) 2782 IIK = IIK_Copy; 2783 else if (Generated && Ctor->isMoveConstructor()) 2784 IIK = IIK_Move; 2785 else 2786 IIK = IIK_Default; 2787 } 2788 2789 bool isImplicitCopyOrMove() const { 2790 switch (IIK) { 2791 case IIK_Copy: 2792 case IIK_Move: 2793 return true; 2794 2795 case IIK_Default: 2796 return false; 2797 } 2798 2799 llvm_unreachable("Invalid ImplicitInitializerKind!"); 2800 } 2801}; 2802} 2803 2804/// \brief Determine whether the given indirect field declaration is somewhere 2805/// within an anonymous union. 2806static bool isWithinAnonymousUnion(IndirectFieldDecl *F) { 2807 for (IndirectFieldDecl::chain_iterator C = F->chain_begin(), 2808 CEnd = F->chain_end(); 2809 C != CEnd; ++C) 2810 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>((*C)->getDeclContext())) 2811 if (Record->isUnion()) 2812 return true; 2813 2814 return false; 2815} 2816 2817/// \brief Determine whether the given type is an incomplete or zero-lenfgth 2818/// array type. 2819static bool isIncompleteOrZeroLengthArrayType(ASTContext &Context, QualType T) { 2820 if (T->isIncompleteArrayType()) 2821 return true; 2822 2823 while (const ConstantArrayType *ArrayT = Context.getAsConstantArrayType(T)) { 2824 if (!ArrayT->getSize()) 2825 return true; 2826 2827 T = ArrayT->getElementType(); 2828 } 2829 2830 return false; 2831} 2832 2833static bool CollectFieldInitializer(Sema &SemaRef, BaseAndFieldInfo &Info, 2834 FieldDecl *Field, 2835 IndirectFieldDecl *Indirect = 0) { 2836 2837 // Overwhelmingly common case: we have a direct initializer for this field. 2838 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(Field)) { 2839 Info.AllToInit.push_back(Init); 2840 return false; 2841 } 2842 2843 // C++0x [class.base.init]p8: if the entity is a non-static data member that 2844 // has a brace-or-equal-initializer, the entity is initialized as specified 2845 // in [dcl.init]. 2846 if (Field->hasInClassInitializer() && !Info.isImplicitCopyOrMove()) { 2847 CXXCtorInitializer *Init; 2848 if (Indirect) 2849 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 2850 SourceLocation(), 2851 SourceLocation(), 0, 2852 SourceLocation()); 2853 else 2854 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 2855 SourceLocation(), 2856 SourceLocation(), 0, 2857 SourceLocation()); 2858 Info.AllToInit.push_back(Init); 2859 2860 // Check whether this initializer makes the field "used". 2861 Expr *InitExpr = Field->getInClassInitializer(); 2862 if (Field->getType()->isRecordType() || 2863 (InitExpr && InitExpr->HasSideEffects(SemaRef.Context))) 2864 SemaRef.UnusedPrivateFields.remove(Field); 2865 2866 return false; 2867 } 2868 2869 // Don't build an implicit initializer for union members if none was 2870 // explicitly specified. 2871 if (Field->getParent()->isUnion() || 2872 (Indirect && isWithinAnonymousUnion(Indirect))) 2873 return false; 2874 2875 // Don't initialize incomplete or zero-length arrays. 2876 if (isIncompleteOrZeroLengthArrayType(SemaRef.Context, Field->getType())) 2877 return false; 2878 2879 // Don't try to build an implicit initializer if there were semantic 2880 // errors in any of the initializers (and therefore we might be 2881 // missing some that the user actually wrote). 2882 if (Info.AnyErrorsInInits || Field->isInvalidDecl()) 2883 return false; 2884 2885 CXXCtorInitializer *Init = 0; 2886 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, 2887 Indirect, Init)) 2888 return true; 2889 2890 if (Init) 2891 Info.AllToInit.push_back(Init); 2892 2893 return false; 2894} 2895 2896bool 2897Sema::SetDelegatingInitializer(CXXConstructorDecl *Constructor, 2898 CXXCtorInitializer *Initializer) { 2899 assert(Initializer->isDelegatingInitializer()); 2900 Constructor->setNumCtorInitializers(1); 2901 CXXCtorInitializer **initializer = 2902 new (Context) CXXCtorInitializer*[1]; 2903 memcpy(initializer, &Initializer, sizeof (CXXCtorInitializer*)); 2904 Constructor->setCtorInitializers(initializer); 2905 2906 if (CXXDestructorDecl *Dtor = LookupDestructor(Constructor->getParent())) { 2907 MarkFunctionReferenced(Initializer->getSourceLocation(), Dtor); 2908 DiagnoseUseOfDecl(Dtor, Initializer->getSourceLocation()); 2909 } 2910 2911 DelegatingCtorDecls.push_back(Constructor); 2912 2913 return false; 2914} 2915 2916bool Sema::SetCtorInitializers(CXXConstructorDecl *Constructor, 2917 CXXCtorInitializer **Initializers, 2918 unsigned NumInitializers, 2919 bool AnyErrors) { 2920 if (Constructor->isDependentContext()) { 2921 // Just store the initializers as written, they will be checked during 2922 // instantiation. 2923 if (NumInitializers > 0) { 2924 Constructor->setNumCtorInitializers(NumInitializers); 2925 CXXCtorInitializer **baseOrMemberInitializers = 2926 new (Context) CXXCtorInitializer*[NumInitializers]; 2927 memcpy(baseOrMemberInitializers, Initializers, 2928 NumInitializers * sizeof(CXXCtorInitializer*)); 2929 Constructor->setCtorInitializers(baseOrMemberInitializers); 2930 } 2931 2932 return false; 2933 } 2934 2935 BaseAndFieldInfo Info(*this, Constructor, AnyErrors); 2936 2937 // We need to build the initializer AST according to order of construction 2938 // and not what user specified in the Initializers list. 2939 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 2940 if (!ClassDecl) 2941 return true; 2942 2943 bool HadError = false; 2944 2945 for (unsigned i = 0; i < NumInitializers; i++) { 2946 CXXCtorInitializer *Member = Initializers[i]; 2947 2948 if (Member->isBaseInitializer()) 2949 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 2950 else 2951 Info.AllBaseFields[Member->getAnyMember()] = Member; 2952 } 2953 2954 // Keep track of the direct virtual bases. 2955 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 2956 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 2957 E = ClassDecl->bases_end(); I != E; ++I) { 2958 if (I->isVirtual()) 2959 DirectVBases.insert(I); 2960 } 2961 2962 // Push virtual bases before others. 2963 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2964 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2965 2966 if (CXXCtorInitializer *Value 2967 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 2968 Info.AllToInit.push_back(Value); 2969 } else if (!AnyErrors) { 2970 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 2971 CXXCtorInitializer *CXXBaseInit; 2972 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2973 VBase, IsInheritedVirtualBase, 2974 CXXBaseInit)) { 2975 HadError = true; 2976 continue; 2977 } 2978 2979 Info.AllToInit.push_back(CXXBaseInit); 2980 } 2981 } 2982 2983 // Non-virtual bases. 2984 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2985 E = ClassDecl->bases_end(); Base != E; ++Base) { 2986 // Virtuals are in the virtual base list and already constructed. 2987 if (Base->isVirtual()) 2988 continue; 2989 2990 if (CXXCtorInitializer *Value 2991 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 2992 Info.AllToInit.push_back(Value); 2993 } else if (!AnyErrors) { 2994 CXXCtorInitializer *CXXBaseInit; 2995 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2996 Base, /*IsInheritedVirtualBase=*/false, 2997 CXXBaseInit)) { 2998 HadError = true; 2999 continue; 3000 } 3001 3002 Info.AllToInit.push_back(CXXBaseInit); 3003 } 3004 } 3005 3006 // Fields. 3007 for (DeclContext::decl_iterator Mem = ClassDecl->decls_begin(), 3008 MemEnd = ClassDecl->decls_end(); 3009 Mem != MemEnd; ++Mem) { 3010 if (FieldDecl *F = dyn_cast<FieldDecl>(*Mem)) { 3011 // C++ [class.bit]p2: 3012 // A declaration for a bit-field that omits the identifier declares an 3013 // unnamed bit-field. Unnamed bit-fields are not members and cannot be 3014 // initialized. 3015 if (F->isUnnamedBitfield()) 3016 continue; 3017 3018 // If we're not generating the implicit copy/move constructor, then we'll 3019 // handle anonymous struct/union fields based on their individual 3020 // indirect fields. 3021 if (F->isAnonymousStructOrUnion() && Info.IIK == IIK_Default) 3022 continue; 3023 3024 if (CollectFieldInitializer(*this, Info, F)) 3025 HadError = true; 3026 continue; 3027 } 3028 3029 // Beyond this point, we only consider default initialization. 3030 if (Info.IIK != IIK_Default) 3031 continue; 3032 3033 if (IndirectFieldDecl *F = dyn_cast<IndirectFieldDecl>(*Mem)) { 3034 if (F->getType()->isIncompleteArrayType()) { 3035 assert(ClassDecl->hasFlexibleArrayMember() && 3036 "Incomplete array type is not valid"); 3037 continue; 3038 } 3039 3040 // Initialize each field of an anonymous struct individually. 3041 if (CollectFieldInitializer(*this, Info, F->getAnonField(), F)) 3042 HadError = true; 3043 3044 continue; 3045 } 3046 } 3047 3048 NumInitializers = Info.AllToInit.size(); 3049 if (NumInitializers > 0) { 3050 Constructor->setNumCtorInitializers(NumInitializers); 3051 CXXCtorInitializer **baseOrMemberInitializers = 3052 new (Context) CXXCtorInitializer*[NumInitializers]; 3053 memcpy(baseOrMemberInitializers, Info.AllToInit.data(), 3054 NumInitializers * sizeof(CXXCtorInitializer*)); 3055 Constructor->setCtorInitializers(baseOrMemberInitializers); 3056 3057 // Constructors implicitly reference the base and member 3058 // destructors. 3059 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 3060 Constructor->getParent()); 3061 } 3062 3063 return HadError; 3064} 3065 3066static void *GetKeyForTopLevelField(FieldDecl *Field) { 3067 // For anonymous unions, use the class declaration as the key. 3068 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 3069 if (RT->getDecl()->isAnonymousStructOrUnion()) 3070 return static_cast<void *>(RT->getDecl()); 3071 } 3072 return static_cast<void *>(Field); 3073} 3074 3075static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 3076 return const_cast<Type*>(Context.getCanonicalType(BaseType).getTypePtr()); 3077} 3078 3079static void *GetKeyForMember(ASTContext &Context, 3080 CXXCtorInitializer *Member) { 3081 if (!Member->isAnyMemberInitializer()) 3082 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 3083 3084 // For fields injected into the class via declaration of an anonymous union, 3085 // use its anonymous union class declaration as the unique key. 3086 FieldDecl *Field = Member->getAnyMember(); 3087 3088 // If the field is a member of an anonymous struct or union, our key 3089 // is the anonymous record decl that's a direct child of the class. 3090 RecordDecl *RD = Field->getParent(); 3091 if (RD->isAnonymousStructOrUnion()) { 3092 while (true) { 3093 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 3094 if (Parent->isAnonymousStructOrUnion()) 3095 RD = Parent; 3096 else 3097 break; 3098 } 3099 3100 return static_cast<void *>(RD); 3101 } 3102 3103 return static_cast<void *>(Field); 3104} 3105 3106static void 3107DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 3108 const CXXConstructorDecl *Constructor, 3109 CXXCtorInitializer **Inits, 3110 unsigned NumInits) { 3111 if (Constructor->getDeclContext()->isDependentContext()) 3112 return; 3113 3114 // Don't check initializers order unless the warning is enabled at the 3115 // location of at least one initializer. 3116 bool ShouldCheckOrder = false; 3117 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 3118 CXXCtorInitializer *Init = Inits[InitIndex]; 3119 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order, 3120 Init->getSourceLocation()) 3121 != DiagnosticsEngine::Ignored) { 3122 ShouldCheckOrder = true; 3123 break; 3124 } 3125 } 3126 if (!ShouldCheckOrder) 3127 return; 3128 3129 // Build the list of bases and members in the order that they'll 3130 // actually be initialized. The explicit initializers should be in 3131 // this same order but may be missing things. 3132 SmallVector<const void*, 32> IdealInitKeys; 3133 3134 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 3135 3136 // 1. Virtual bases. 3137 for (CXXRecordDecl::base_class_const_iterator VBase = 3138 ClassDecl->vbases_begin(), 3139 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 3140 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 3141 3142 // 2. Non-virtual bases. 3143 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 3144 E = ClassDecl->bases_end(); Base != E; ++Base) { 3145 if (Base->isVirtual()) 3146 continue; 3147 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 3148 } 3149 3150 // 3. Direct fields. 3151 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 3152 E = ClassDecl->field_end(); Field != E; ++Field) { 3153 if (Field->isUnnamedBitfield()) 3154 continue; 3155 3156 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 3157 } 3158 3159 unsigned NumIdealInits = IdealInitKeys.size(); 3160 unsigned IdealIndex = 0; 3161 3162 CXXCtorInitializer *PrevInit = 0; 3163 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 3164 CXXCtorInitializer *Init = Inits[InitIndex]; 3165 void *InitKey = GetKeyForMember(SemaRef.Context, Init); 3166 3167 // Scan forward to try to find this initializer in the idealized 3168 // initializers list. 3169 for (; IdealIndex != NumIdealInits; ++IdealIndex) 3170 if (InitKey == IdealInitKeys[IdealIndex]) 3171 break; 3172 3173 // If we didn't find this initializer, it must be because we 3174 // scanned past it on a previous iteration. That can only 3175 // happen if we're out of order; emit a warning. 3176 if (IdealIndex == NumIdealInits && PrevInit) { 3177 Sema::SemaDiagnosticBuilder D = 3178 SemaRef.Diag(PrevInit->getSourceLocation(), 3179 diag::warn_initializer_out_of_order); 3180 3181 if (PrevInit->isAnyMemberInitializer()) 3182 D << 0 << PrevInit->getAnyMember()->getDeclName(); 3183 else 3184 D << 1 << PrevInit->getTypeSourceInfo()->getType(); 3185 3186 if (Init->isAnyMemberInitializer()) 3187 D << 0 << Init->getAnyMember()->getDeclName(); 3188 else 3189 D << 1 << Init->getTypeSourceInfo()->getType(); 3190 3191 // Move back to the initializer's location in the ideal list. 3192 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 3193 if (InitKey == IdealInitKeys[IdealIndex]) 3194 break; 3195 3196 assert(IdealIndex != NumIdealInits && 3197 "initializer not found in initializer list"); 3198 } 3199 3200 PrevInit = Init; 3201 } 3202} 3203 3204namespace { 3205bool CheckRedundantInit(Sema &S, 3206 CXXCtorInitializer *Init, 3207 CXXCtorInitializer *&PrevInit) { 3208 if (!PrevInit) { 3209 PrevInit = Init; 3210 return false; 3211 } 3212 3213 if (FieldDecl *Field = Init->getMember()) 3214 S.Diag(Init->getSourceLocation(), 3215 diag::err_multiple_mem_initialization) 3216 << Field->getDeclName() 3217 << Init->getSourceRange(); 3218 else { 3219 const Type *BaseClass = Init->getBaseClass(); 3220 assert(BaseClass && "neither field nor base"); 3221 S.Diag(Init->getSourceLocation(), 3222 diag::err_multiple_base_initialization) 3223 << QualType(BaseClass, 0) 3224 << Init->getSourceRange(); 3225 } 3226 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 3227 << 0 << PrevInit->getSourceRange(); 3228 3229 return true; 3230} 3231 3232typedef std::pair<NamedDecl *, CXXCtorInitializer *> UnionEntry; 3233typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 3234 3235bool CheckRedundantUnionInit(Sema &S, 3236 CXXCtorInitializer *Init, 3237 RedundantUnionMap &Unions) { 3238 FieldDecl *Field = Init->getAnyMember(); 3239 RecordDecl *Parent = Field->getParent(); 3240 NamedDecl *Child = Field; 3241 3242 while (Parent->isAnonymousStructOrUnion() || Parent->isUnion()) { 3243 if (Parent->isUnion()) { 3244 UnionEntry &En = Unions[Parent]; 3245 if (En.first && En.first != Child) { 3246 S.Diag(Init->getSourceLocation(), 3247 diag::err_multiple_mem_union_initialization) 3248 << Field->getDeclName() 3249 << Init->getSourceRange(); 3250 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 3251 << 0 << En.second->getSourceRange(); 3252 return true; 3253 } 3254 if (!En.first) { 3255 En.first = Child; 3256 En.second = Init; 3257 } 3258 if (!Parent->isAnonymousStructOrUnion()) 3259 return false; 3260 } 3261 3262 Child = Parent; 3263 Parent = cast<RecordDecl>(Parent->getDeclContext()); 3264 } 3265 3266 return false; 3267} 3268} 3269 3270/// ActOnMemInitializers - Handle the member initializers for a constructor. 3271void Sema::ActOnMemInitializers(Decl *ConstructorDecl, 3272 SourceLocation ColonLoc, 3273 CXXCtorInitializer **meminits, 3274 unsigned NumMemInits, 3275 bool AnyErrors) { 3276 if (!ConstructorDecl) 3277 return; 3278 3279 AdjustDeclIfTemplate(ConstructorDecl); 3280 3281 CXXConstructorDecl *Constructor 3282 = dyn_cast<CXXConstructorDecl>(ConstructorDecl); 3283 3284 if (!Constructor) { 3285 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 3286 return; 3287 } 3288 3289 CXXCtorInitializer **MemInits = 3290 reinterpret_cast<CXXCtorInitializer **>(meminits); 3291 3292 // Mapping for the duplicate initializers check. 3293 // For member initializers, this is keyed with a FieldDecl*. 3294 // For base initializers, this is keyed with a Type*. 3295 llvm::DenseMap<void*, CXXCtorInitializer *> Members; 3296 3297 // Mapping for the inconsistent anonymous-union initializers check. 3298 RedundantUnionMap MemberUnions; 3299 3300 bool HadError = false; 3301 for (unsigned i = 0; i < NumMemInits; i++) { 3302 CXXCtorInitializer *Init = MemInits[i]; 3303 3304 // Set the source order index. 3305 Init->setSourceOrder(i); 3306 3307 if (Init->isAnyMemberInitializer()) { 3308 FieldDecl *Field = Init->getAnyMember(); 3309 if (CheckRedundantInit(*this, Init, Members[Field]) || 3310 CheckRedundantUnionInit(*this, Init, MemberUnions)) 3311 HadError = true; 3312 } else if (Init->isBaseInitializer()) { 3313 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 3314 if (CheckRedundantInit(*this, Init, Members[Key])) 3315 HadError = true; 3316 } else { 3317 assert(Init->isDelegatingInitializer()); 3318 // This must be the only initializer 3319 if (i != 0 || NumMemInits > 1) { 3320 Diag(MemInits[0]->getSourceLocation(), 3321 diag::err_delegating_initializer_alone) 3322 << MemInits[0]->getSourceRange(); 3323 HadError = true; 3324 // We will treat this as being the only initializer. 3325 } 3326 SetDelegatingInitializer(Constructor, MemInits[i]); 3327 // Return immediately as the initializer is set. 3328 return; 3329 } 3330 } 3331 3332 if (HadError) 3333 return; 3334 3335 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 3336 3337 SetCtorInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 3338} 3339 3340void 3341Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 3342 CXXRecordDecl *ClassDecl) { 3343 // Ignore dependent contexts. Also ignore unions, since their members never 3344 // have destructors implicitly called. 3345 if (ClassDecl->isDependentContext() || ClassDecl->isUnion()) 3346 return; 3347 3348 // FIXME: all the access-control diagnostics are positioned on the 3349 // field/base declaration. That's probably good; that said, the 3350 // user might reasonably want to know why the destructor is being 3351 // emitted, and we currently don't say. 3352 3353 // Non-static data members. 3354 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 3355 E = ClassDecl->field_end(); I != E; ++I) { 3356 FieldDecl *Field = *I; 3357 if (Field->isInvalidDecl()) 3358 continue; 3359 3360 // Don't destroy incomplete or zero-length arrays. 3361 if (isIncompleteOrZeroLengthArrayType(Context, Field->getType())) 3362 continue; 3363 3364 QualType FieldType = Context.getBaseElementType(Field->getType()); 3365 3366 const RecordType* RT = FieldType->getAs<RecordType>(); 3367 if (!RT) 3368 continue; 3369 3370 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3371 if (FieldClassDecl->isInvalidDecl()) 3372 continue; 3373 if (FieldClassDecl->hasIrrelevantDestructor()) 3374 continue; 3375 // The destructor for an implicit anonymous union member is never invoked. 3376 if (FieldClassDecl->isUnion() && FieldClassDecl->isAnonymousStructOrUnion()) 3377 continue; 3378 3379 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl); 3380 assert(Dtor && "No dtor found for FieldClassDecl!"); 3381 CheckDestructorAccess(Field->getLocation(), Dtor, 3382 PDiag(diag::err_access_dtor_field) 3383 << Field->getDeclName() 3384 << FieldType); 3385 3386 MarkFunctionReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3387 DiagnoseUseOfDecl(Dtor, Location); 3388 } 3389 3390 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 3391 3392 // Bases. 3393 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3394 E = ClassDecl->bases_end(); Base != E; ++Base) { 3395 // Bases are always records in a well-formed non-dependent class. 3396 const RecordType *RT = Base->getType()->getAs<RecordType>(); 3397 3398 // Remember direct virtual bases. 3399 if (Base->isVirtual()) 3400 DirectVirtualBases.insert(RT); 3401 3402 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3403 // If our base class is invalid, we probably can't get its dtor anyway. 3404 if (BaseClassDecl->isInvalidDecl()) 3405 continue; 3406 if (BaseClassDecl->hasIrrelevantDestructor()) 3407 continue; 3408 3409 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 3410 assert(Dtor && "No dtor found for BaseClassDecl!"); 3411 3412 // FIXME: caret should be on the start of the class name 3413 CheckDestructorAccess(Base->getLocStart(), Dtor, 3414 PDiag(diag::err_access_dtor_base) 3415 << Base->getType() 3416 << Base->getSourceRange(), 3417 Context.getTypeDeclType(ClassDecl)); 3418 3419 MarkFunctionReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3420 DiagnoseUseOfDecl(Dtor, Location); 3421 } 3422 3423 // Virtual bases. 3424 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 3425 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 3426 3427 // Bases are always records in a well-formed non-dependent class. 3428 const RecordType *RT = VBase->getType()->castAs<RecordType>(); 3429 3430 // Ignore direct virtual bases. 3431 if (DirectVirtualBases.count(RT)) 3432 continue; 3433 3434 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3435 // If our base class is invalid, we probably can't get its dtor anyway. 3436 if (BaseClassDecl->isInvalidDecl()) 3437 continue; 3438 if (BaseClassDecl->hasIrrelevantDestructor()) 3439 continue; 3440 3441 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 3442 assert(Dtor && "No dtor found for BaseClassDecl!"); 3443 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 3444 PDiag(diag::err_access_dtor_vbase) 3445 << VBase->getType(), 3446 Context.getTypeDeclType(ClassDecl)); 3447 3448 MarkFunctionReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3449 DiagnoseUseOfDecl(Dtor, Location); 3450 } 3451} 3452 3453void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) { 3454 if (!CDtorDecl) 3455 return; 3456 3457 if (CXXConstructorDecl *Constructor 3458 = dyn_cast<CXXConstructorDecl>(CDtorDecl)) 3459 SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 3460} 3461 3462bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 3463 unsigned DiagID, AbstractDiagSelID SelID) { 3464 class NonAbstractTypeDiagnoser : public TypeDiagnoser { 3465 unsigned DiagID; 3466 AbstractDiagSelID SelID; 3467 3468 public: 3469 NonAbstractTypeDiagnoser(unsigned DiagID, AbstractDiagSelID SelID) 3470 : TypeDiagnoser(DiagID == 0), DiagID(DiagID), SelID(SelID) { } 3471 3472 virtual void diagnose(Sema &S, SourceLocation Loc, QualType T) { 3473 if (SelID == -1) 3474 S.Diag(Loc, DiagID) << T; 3475 else 3476 S.Diag(Loc, DiagID) << SelID << T; 3477 } 3478 } Diagnoser(DiagID, SelID); 3479 3480 return RequireNonAbstractType(Loc, T, Diagnoser); 3481} 3482 3483bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 3484 TypeDiagnoser &Diagnoser) { 3485 if (!getLangOpts().CPlusPlus) 3486 return false; 3487 3488 if (const ArrayType *AT = Context.getAsArrayType(T)) 3489 return RequireNonAbstractType(Loc, AT->getElementType(), Diagnoser); 3490 3491 if (const PointerType *PT = T->getAs<PointerType>()) { 3492 // Find the innermost pointer type. 3493 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 3494 PT = T; 3495 3496 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 3497 return RequireNonAbstractType(Loc, AT->getElementType(), Diagnoser); 3498 } 3499 3500 const RecordType *RT = T->getAs<RecordType>(); 3501 if (!RT) 3502 return false; 3503 3504 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 3505 3506 // We can't answer whether something is abstract until it has a 3507 // definition. If it's currently being defined, we'll walk back 3508 // over all the declarations when we have a full definition. 3509 const CXXRecordDecl *Def = RD->getDefinition(); 3510 if (!Def || Def->isBeingDefined()) 3511 return false; 3512 3513 if (!RD->isAbstract()) 3514 return false; 3515 3516 Diagnoser.diagnose(*this, Loc, T); 3517 DiagnoseAbstractType(RD); 3518 3519 return true; 3520} 3521 3522void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) { 3523 // Check if we've already emitted the list of pure virtual functions 3524 // for this class. 3525 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 3526 return; 3527 3528 CXXFinalOverriderMap FinalOverriders; 3529 RD->getFinalOverriders(FinalOverriders); 3530 3531 // Keep a set of seen pure methods so we won't diagnose the same method 3532 // more than once. 3533 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; 3534 3535 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 3536 MEnd = FinalOverriders.end(); 3537 M != MEnd; 3538 ++M) { 3539 for (OverridingMethods::iterator SO = M->second.begin(), 3540 SOEnd = M->second.end(); 3541 SO != SOEnd; ++SO) { 3542 // C++ [class.abstract]p4: 3543 // A class is abstract if it contains or inherits at least one 3544 // pure virtual function for which the final overrider is pure 3545 // virtual. 3546 3547 // 3548 if (SO->second.size() != 1) 3549 continue; 3550 3551 if (!SO->second.front().Method->isPure()) 3552 continue; 3553 3554 if (!SeenPureMethods.insert(SO->second.front().Method)) 3555 continue; 3556 3557 Diag(SO->second.front().Method->getLocation(), 3558 diag::note_pure_virtual_function) 3559 << SO->second.front().Method->getDeclName() << RD->getDeclName(); 3560 } 3561 } 3562 3563 if (!PureVirtualClassDiagSet) 3564 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 3565 PureVirtualClassDiagSet->insert(RD); 3566} 3567 3568namespace { 3569struct AbstractUsageInfo { 3570 Sema &S; 3571 CXXRecordDecl *Record; 3572 CanQualType AbstractType; 3573 bool Invalid; 3574 3575 AbstractUsageInfo(Sema &S, CXXRecordDecl *Record) 3576 : S(S), Record(Record), 3577 AbstractType(S.Context.getCanonicalType( 3578 S.Context.getTypeDeclType(Record))), 3579 Invalid(false) {} 3580 3581 void DiagnoseAbstractType() { 3582 if (Invalid) return; 3583 S.DiagnoseAbstractType(Record); 3584 Invalid = true; 3585 } 3586 3587 void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel); 3588}; 3589 3590struct CheckAbstractUsage { 3591 AbstractUsageInfo &Info; 3592 const NamedDecl *Ctx; 3593 3594 CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx) 3595 : Info(Info), Ctx(Ctx) {} 3596 3597 void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 3598 switch (TL.getTypeLocClass()) { 3599#define ABSTRACT_TYPELOC(CLASS, PARENT) 3600#define TYPELOC(CLASS, PARENT) \ 3601 case TypeLoc::CLASS: Check(cast<CLASS##TypeLoc>(TL), Sel); break; 3602#include "clang/AST/TypeLocNodes.def" 3603 } 3604 } 3605 3606 void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3607 Visit(TL.getResultLoc(), Sema::AbstractReturnType); 3608 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 3609 if (!TL.getArg(I)) 3610 continue; 3611 3612 TypeSourceInfo *TSI = TL.getArg(I)->getTypeSourceInfo(); 3613 if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType); 3614 } 3615 } 3616 3617 void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3618 Visit(TL.getElementLoc(), Sema::AbstractArrayType); 3619 } 3620 3621 void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3622 // Visit the type parameters from a permissive context. 3623 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 3624 TemplateArgumentLoc TAL = TL.getArgLoc(I); 3625 if (TAL.getArgument().getKind() == TemplateArgument::Type) 3626 if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo()) 3627 Visit(TSI->getTypeLoc(), Sema::AbstractNone); 3628 // TODO: other template argument types? 3629 } 3630 } 3631 3632 // Visit pointee types from a permissive context. 3633#define CheckPolymorphic(Type) \ 3634 void Check(Type TL, Sema::AbstractDiagSelID Sel) { \ 3635 Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \ 3636 } 3637 CheckPolymorphic(PointerTypeLoc) 3638 CheckPolymorphic(ReferenceTypeLoc) 3639 CheckPolymorphic(MemberPointerTypeLoc) 3640 CheckPolymorphic(BlockPointerTypeLoc) 3641 CheckPolymorphic(AtomicTypeLoc) 3642 3643 /// Handle all the types we haven't given a more specific 3644 /// implementation for above. 3645 void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 3646 // Every other kind of type that we haven't called out already 3647 // that has an inner type is either (1) sugar or (2) contains that 3648 // inner type in some way as a subobject. 3649 if (TypeLoc Next = TL.getNextTypeLoc()) 3650 return Visit(Next, Sel); 3651 3652 // If there's no inner type and we're in a permissive context, 3653 // don't diagnose. 3654 if (Sel == Sema::AbstractNone) return; 3655 3656 // Check whether the type matches the abstract type. 3657 QualType T = TL.getType(); 3658 if (T->isArrayType()) { 3659 Sel = Sema::AbstractArrayType; 3660 T = Info.S.Context.getBaseElementType(T); 3661 } 3662 CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType(); 3663 if (CT != Info.AbstractType) return; 3664 3665 // It matched; do some magic. 3666 if (Sel == Sema::AbstractArrayType) { 3667 Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type) 3668 << T << TL.getSourceRange(); 3669 } else { 3670 Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl) 3671 << Sel << T << TL.getSourceRange(); 3672 } 3673 Info.DiagnoseAbstractType(); 3674 } 3675}; 3676 3677void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL, 3678 Sema::AbstractDiagSelID Sel) { 3679 CheckAbstractUsage(*this, D).Visit(TL, Sel); 3680} 3681 3682} 3683 3684/// Check for invalid uses of an abstract type in a method declaration. 3685static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 3686 CXXMethodDecl *MD) { 3687 // No need to do the check on definitions, which require that 3688 // the return/param types be complete. 3689 if (MD->doesThisDeclarationHaveABody()) 3690 return; 3691 3692 // For safety's sake, just ignore it if we don't have type source 3693 // information. This should never happen for non-implicit methods, 3694 // but... 3695 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo()) 3696 Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone); 3697} 3698 3699/// Check for invalid uses of an abstract type within a class definition. 3700static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 3701 CXXRecordDecl *RD) { 3702 for (CXXRecordDecl::decl_iterator 3703 I = RD->decls_begin(), E = RD->decls_end(); I != E; ++I) { 3704 Decl *D = *I; 3705 if (D->isImplicit()) continue; 3706 3707 // Methods and method templates. 3708 if (isa<CXXMethodDecl>(D)) { 3709 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D)); 3710 } else if (isa<FunctionTemplateDecl>(D)) { 3711 FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl(); 3712 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD)); 3713 3714 // Fields and static variables. 3715 } else if (isa<FieldDecl>(D)) { 3716 FieldDecl *FD = cast<FieldDecl>(D); 3717 if (TypeSourceInfo *TSI = FD->getTypeSourceInfo()) 3718 Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType); 3719 } else if (isa<VarDecl>(D)) { 3720 VarDecl *VD = cast<VarDecl>(D); 3721 if (TypeSourceInfo *TSI = VD->getTypeSourceInfo()) 3722 Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType); 3723 3724 // Nested classes and class templates. 3725 } else if (isa<CXXRecordDecl>(D)) { 3726 CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D)); 3727 } else if (isa<ClassTemplateDecl>(D)) { 3728 CheckAbstractClassUsage(Info, 3729 cast<ClassTemplateDecl>(D)->getTemplatedDecl()); 3730 } 3731 } 3732} 3733 3734/// \brief Perform semantic checks on a class definition that has been 3735/// completing, introducing implicitly-declared members, checking for 3736/// abstract types, etc. 3737void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 3738 if (!Record) 3739 return; 3740 3741 if (Record->isAbstract() && !Record->isInvalidDecl()) { 3742 AbstractUsageInfo Info(*this, Record); 3743 CheckAbstractClassUsage(Info, Record); 3744 } 3745 3746 // If this is not an aggregate type and has no user-declared constructor, 3747 // complain about any non-static data members of reference or const scalar 3748 // type, since they will never get initializers. 3749 if (!Record->isInvalidDecl() && !Record->isDependentType() && 3750 !Record->isAggregate() && !Record->hasUserDeclaredConstructor() && 3751 !Record->isLambda()) { 3752 bool Complained = false; 3753 for (RecordDecl::field_iterator F = Record->field_begin(), 3754 FEnd = Record->field_end(); 3755 F != FEnd; ++F) { 3756 if (F->hasInClassInitializer() || F->isUnnamedBitfield()) 3757 continue; 3758 3759 if (F->getType()->isReferenceType() || 3760 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 3761 if (!Complained) { 3762 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 3763 << Record->getTagKind() << Record; 3764 Complained = true; 3765 } 3766 3767 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 3768 << F->getType()->isReferenceType() 3769 << F->getDeclName(); 3770 } 3771 } 3772 } 3773 3774 if (Record->isDynamicClass() && !Record->isDependentType()) 3775 DynamicClasses.push_back(Record); 3776 3777 if (Record->getIdentifier()) { 3778 // C++ [class.mem]p13: 3779 // If T is the name of a class, then each of the following shall have a 3780 // name different from T: 3781 // - every member of every anonymous union that is a member of class T. 3782 // 3783 // C++ [class.mem]p14: 3784 // In addition, if class T has a user-declared constructor (12.1), every 3785 // non-static data member of class T shall have a name different from T. 3786 for (DeclContext::lookup_result R = Record->lookup(Record->getDeclName()); 3787 R.first != R.second; ++R.first) { 3788 NamedDecl *D = *R.first; 3789 if ((isa<FieldDecl>(D) && Record->hasUserDeclaredConstructor()) || 3790 isa<IndirectFieldDecl>(D)) { 3791 Diag(D->getLocation(), diag::err_member_name_of_class) 3792 << D->getDeclName(); 3793 break; 3794 } 3795 } 3796 } 3797 3798 // Warn if the class has virtual methods but non-virtual public destructor. 3799 if (Record->isPolymorphic() && !Record->isDependentType()) { 3800 CXXDestructorDecl *dtor = Record->getDestructor(); 3801 if (!dtor || (!dtor->isVirtual() && dtor->getAccess() == AS_public)) 3802 Diag(dtor ? dtor->getLocation() : Record->getLocation(), 3803 diag::warn_non_virtual_dtor) << Context.getRecordType(Record); 3804 } 3805 3806 // See if a method overloads virtual methods in a base 3807 /// class without overriding any. 3808 if (!Record->isDependentType()) { 3809 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 3810 MEnd = Record->method_end(); 3811 M != MEnd; ++M) { 3812 if (!M->isStatic()) 3813 DiagnoseHiddenVirtualMethods(Record, *M); 3814 } 3815 } 3816 3817 // C++0x [dcl.constexpr]p8: A constexpr specifier for a non-static member 3818 // function that is not a constructor declares that member function to be 3819 // const. [...] The class of which that function is a member shall be 3820 // a literal type. 3821 // 3822 // If the class has virtual bases, any constexpr members will already have 3823 // been diagnosed by the checks performed on the member declaration, so 3824 // suppress this (less useful) diagnostic. 3825 if (LangOpts.CPlusPlus0x && !Record->isDependentType() && 3826 !Record->isLiteral() && !Record->getNumVBases()) { 3827 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 3828 MEnd = Record->method_end(); 3829 M != MEnd; ++M) { 3830 if (M->isConstexpr() && M->isInstance() && !isa<CXXConstructorDecl>(*M)) { 3831 switch (Record->getTemplateSpecializationKind()) { 3832 case TSK_ImplicitInstantiation: 3833 case TSK_ExplicitInstantiationDeclaration: 3834 case TSK_ExplicitInstantiationDefinition: 3835 // If a template instantiates to a non-literal type, but its members 3836 // instantiate to constexpr functions, the template is technically 3837 // ill-formed, but we allow it for sanity. 3838 continue; 3839 3840 case TSK_Undeclared: 3841 case TSK_ExplicitSpecialization: 3842 RequireLiteralType(M->getLocation(), Context.getRecordType(Record), 3843 diag::err_constexpr_method_non_literal); 3844 break; 3845 } 3846 3847 // Only produce one error per class. 3848 break; 3849 } 3850 } 3851 } 3852 3853 // Declare inherited constructors. We do this eagerly here because: 3854 // - The standard requires an eager diagnostic for conflicting inherited 3855 // constructors from different classes. 3856 // - The lazy declaration of the other implicit constructors is so as to not 3857 // waste space and performance on classes that are not meant to be 3858 // instantiated (e.g. meta-functions). This doesn't apply to classes that 3859 // have inherited constructors. 3860 DeclareInheritedConstructors(Record); 3861 3862 if (!Record->isDependentType()) 3863 CheckExplicitlyDefaultedMethods(Record); 3864} 3865 3866void Sema::CheckExplicitlyDefaultedMethods(CXXRecordDecl *Record) { 3867 for (CXXRecordDecl::method_iterator MI = Record->method_begin(), 3868 ME = Record->method_end(); 3869 MI != ME; ++MI) 3870 if (!MI->isInvalidDecl() && MI->isExplicitlyDefaulted()) 3871 CheckExplicitlyDefaultedSpecialMember(*MI); 3872} 3873 3874/// Is the special member function which would be selected to perform the 3875/// specified operation on the specified class type a constexpr constructor? 3876static bool specialMemberIsConstexpr(Sema &S, CXXRecordDecl *ClassDecl, 3877 Sema::CXXSpecialMember CSM, 3878 bool ConstArg) { 3879 Sema::SpecialMemberOverloadResult *SMOR = 3880 S.LookupSpecialMember(ClassDecl, CSM, ConstArg, 3881 false, false, false, false); 3882 if (!SMOR || !SMOR->getMethod()) 3883 // A constructor we wouldn't select can't be "involved in initializing" 3884 // anything. 3885 return true; 3886 return SMOR->getMethod()->isConstexpr(); 3887} 3888 3889/// Determine whether the specified special member function would be constexpr 3890/// if it were implicitly defined. 3891static bool defaultedSpecialMemberIsConstexpr(Sema &S, CXXRecordDecl *ClassDecl, 3892 Sema::CXXSpecialMember CSM, 3893 bool ConstArg) { 3894 if (!S.getLangOpts().CPlusPlus0x) 3895 return false; 3896 3897 // C++11 [dcl.constexpr]p4: 3898 // In the definition of a constexpr constructor [...] 3899 switch (CSM) { 3900 case Sema::CXXDefaultConstructor: 3901 // Since default constructor lookup is essentially trivial (and cannot 3902 // involve, for instance, template instantiation), we compute whether a 3903 // defaulted default constructor is constexpr directly within CXXRecordDecl. 3904 // 3905 // This is important for performance; we need to know whether the default 3906 // constructor is constexpr to determine whether the type is a literal type. 3907 return ClassDecl->defaultedDefaultConstructorIsConstexpr(); 3908 3909 case Sema::CXXCopyConstructor: 3910 case Sema::CXXMoveConstructor: 3911 // For copy or move constructors, we need to perform overload resolution. 3912 break; 3913 3914 case Sema::CXXCopyAssignment: 3915 case Sema::CXXMoveAssignment: 3916 case Sema::CXXDestructor: 3917 case Sema::CXXInvalid: 3918 return false; 3919 } 3920 3921 // -- if the class is a non-empty union, or for each non-empty anonymous 3922 // union member of a non-union class, exactly one non-static data member 3923 // shall be initialized; [DR1359] 3924 // 3925 // If we squint, this is guaranteed, since exactly one non-static data member 3926 // will be initialized (if the constructor isn't deleted), we just don't know 3927 // which one. 3928 if (ClassDecl->isUnion()) 3929 return true; 3930 3931 // -- the class shall not have any virtual base classes; 3932 if (ClassDecl->getNumVBases()) 3933 return false; 3934 3935 // -- every constructor involved in initializing [...] base class 3936 // sub-objects shall be a constexpr constructor; 3937 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 3938 BEnd = ClassDecl->bases_end(); 3939 B != BEnd; ++B) { 3940 const RecordType *BaseType = B->getType()->getAs<RecordType>(); 3941 if (!BaseType) continue; 3942 3943 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 3944 if (!specialMemberIsConstexpr(S, BaseClassDecl, CSM, ConstArg)) 3945 return false; 3946 } 3947 3948 // -- every constructor involved in initializing non-static data members 3949 // [...] shall be a constexpr constructor; 3950 // -- every non-static data member and base class sub-object shall be 3951 // initialized 3952 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 3953 FEnd = ClassDecl->field_end(); 3954 F != FEnd; ++F) { 3955 if (F->isInvalidDecl()) 3956 continue; 3957 if (const RecordType *RecordTy = 3958 S.Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 3959 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 3960 if (!specialMemberIsConstexpr(S, FieldRecDecl, CSM, ConstArg)) 3961 return false; 3962 } 3963 } 3964 3965 // All OK, it's constexpr! 3966 return true; 3967} 3968 3969void Sema::CheckExplicitlyDefaultedSpecialMember(CXXMethodDecl *MD) { 3970 CXXRecordDecl *RD = MD->getParent(); 3971 CXXSpecialMember CSM = getSpecialMember(MD); 3972 3973 assert(MD->isExplicitlyDefaulted() && CSM != CXXInvalid && 3974 "not an explicitly-defaulted special member"); 3975 3976 // Whether this was the first-declared instance of the constructor. 3977 // This affects whether we implicitly add an exception spec and constexpr. 3978 bool First = MD == MD->getCanonicalDecl(); 3979 3980 bool HadError = false; 3981 3982 // C++11 [dcl.fct.def.default]p1: 3983 // A function that is explicitly defaulted shall 3984 // -- be a special member function (checked elsewhere), 3985 // -- have the same type (except for ref-qualifiers, and except that a 3986 // copy operation can take a non-const reference) as an implicit 3987 // declaration, and 3988 // -- not have default arguments. 3989 unsigned ExpectedParams = 1; 3990 if (CSM == CXXDefaultConstructor || CSM == CXXDestructor) 3991 ExpectedParams = 0; 3992 if (MD->getNumParams() != ExpectedParams) { 3993 // This also checks for default arguments: a copy or move constructor with a 3994 // default argument is classified as a default constructor, and assignment 3995 // operations and destructors can't have default arguments. 3996 Diag(MD->getLocation(), diag::err_defaulted_special_member_params) 3997 << CSM << MD->getSourceRange(); 3998 HadError = true; 3999 } 4000 4001 const FunctionProtoType *Type = MD->getType()->getAs<FunctionProtoType>(); 4002 4003 // Compute implicit exception specification, argument constness, constexpr 4004 // and triviality. 4005 ImplicitExceptionSpecification Spec(*this); 4006 bool CanHaveConstParam = false; 4007 bool Trivial; 4008 switch (CSM) { 4009 case CXXDefaultConstructor: 4010 Spec = ComputeDefaultedDefaultCtorExceptionSpec(RD); 4011 if (Spec.isDelayed()) 4012 // Exception specification depends on some deferred part of the class. 4013 // We'll try again when the class's definition has been fully processed. 4014 return; 4015 Trivial = RD->hasTrivialDefaultConstructor(); 4016 break; 4017 case CXXCopyConstructor: 4018 llvm::tie(Spec, CanHaveConstParam) = 4019 ComputeDefaultedCopyCtorExceptionSpecAndConst(RD); 4020 Trivial = RD->hasTrivialCopyConstructor(); 4021 break; 4022 case CXXCopyAssignment: 4023 llvm::tie(Spec, CanHaveConstParam) = 4024 ComputeDefaultedCopyAssignmentExceptionSpecAndConst(RD); 4025 Trivial = RD->hasTrivialCopyAssignment(); 4026 break; 4027 case CXXMoveConstructor: 4028 Spec = ComputeDefaultedMoveCtorExceptionSpec(RD); 4029 Trivial = RD->hasTrivialMoveConstructor(); 4030 break; 4031 case CXXMoveAssignment: 4032 Spec = ComputeDefaultedMoveAssignmentExceptionSpec(RD); 4033 Trivial = RD->hasTrivialMoveAssignment(); 4034 break; 4035 case CXXDestructor: 4036 Spec = ComputeDefaultedDtorExceptionSpec(RD); 4037 Trivial = RD->hasTrivialDestructor(); 4038 break; 4039 case CXXInvalid: 4040 llvm_unreachable("non-special member explicitly defaulted!"); 4041 } 4042 4043 QualType ReturnType = Context.VoidTy; 4044 if (CSM == CXXCopyAssignment || CSM == CXXMoveAssignment) { 4045 // Check for return type matching. 4046 ReturnType = Type->getResultType(); 4047 QualType ExpectedReturnType = 4048 Context.getLValueReferenceType(Context.getTypeDeclType(RD)); 4049 if (!Context.hasSameType(ReturnType, ExpectedReturnType)) { 4050 Diag(MD->getLocation(), diag::err_defaulted_special_member_return_type) 4051 << (CSM == CXXMoveAssignment) << ExpectedReturnType; 4052 HadError = true; 4053 } 4054 4055 // A defaulted special member cannot have cv-qualifiers. 4056 if (Type->getTypeQuals()) { 4057 Diag(MD->getLocation(), diag::err_defaulted_special_member_quals) 4058 << (CSM == CXXMoveAssignment); 4059 HadError = true; 4060 } 4061 } 4062 4063 // Check for parameter type matching. 4064 QualType ArgType = ExpectedParams ? Type->getArgType(0) : QualType(); 4065 bool HasConstParam = false; 4066 if (ExpectedParams && ArgType->isReferenceType()) { 4067 // Argument must be reference to possibly-const T. 4068 QualType ReferentType = ArgType->getPointeeType(); 4069 HasConstParam = ReferentType.isConstQualified(); 4070 4071 if (ReferentType.isVolatileQualified()) { 4072 Diag(MD->getLocation(), 4073 diag::err_defaulted_special_member_volatile_param) << CSM; 4074 HadError = true; 4075 } 4076 4077 if (HasConstParam && !CanHaveConstParam) { 4078 if (CSM == CXXCopyConstructor || CSM == CXXCopyAssignment) { 4079 Diag(MD->getLocation(), 4080 diag::err_defaulted_special_member_copy_const_param) 4081 << (CSM == CXXCopyAssignment); 4082 // FIXME: Explain why this special member can't be const. 4083 } else { 4084 Diag(MD->getLocation(), 4085 diag::err_defaulted_special_member_move_const_param) 4086 << (CSM == CXXMoveAssignment); 4087 } 4088 HadError = true; 4089 } 4090 4091 // If a function is explicitly defaulted on its first declaration, it shall 4092 // have the same parameter type as if it had been implicitly declared. 4093 // (Presumably this is to prevent it from being trivial?) 4094 if (!HasConstParam && CanHaveConstParam && First) 4095 Diag(MD->getLocation(), 4096 diag::err_defaulted_special_member_copy_non_const_param) 4097 << (CSM == CXXCopyAssignment); 4098 } else if (ExpectedParams) { 4099 // A copy assignment operator can take its argument by value, but a 4100 // defaulted one cannot. 4101 assert(CSM == CXXCopyAssignment && "unexpected non-ref argument"); 4102 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_not_ref); 4103 HadError = true; 4104 } 4105 4106 // Rebuild the type with the implicit exception specification added. 4107 FunctionProtoType::ExtProtoInfo EPI = Type->getExtProtoInfo(); 4108 Spec.getEPI(EPI); 4109 const FunctionProtoType *ImplicitType = cast<FunctionProtoType>( 4110 Context.getFunctionType(ReturnType, &ArgType, ExpectedParams, EPI)); 4111 4112 // C++11 [dcl.fct.def.default]p2: 4113 // An explicitly-defaulted function may be declared constexpr only if it 4114 // would have been implicitly declared as constexpr, 4115 // Do not apply this rule to members of class templates, since core issue 1358 4116 // makes such functions always instantiate to constexpr functions. For 4117 // non-constructors, this is checked elsewhere. 4118 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, RD, CSM, 4119 HasConstParam); 4120 if (isa<CXXConstructorDecl>(MD) && MD->isConstexpr() && !Constexpr && 4121 MD->getTemplatedKind() == FunctionDecl::TK_NonTemplate) { 4122 Diag(MD->getLocStart(), diag::err_incorrect_defaulted_constexpr) << CSM; 4123 // FIXME: Explain why the constructor can't be constexpr. 4124 HadError = true; 4125 } 4126 // and may have an explicit exception-specification only if it is compatible 4127 // with the exception-specification on the implicit declaration. 4128 if (Type->hasExceptionSpec() && 4129 CheckEquivalentExceptionSpec( 4130 PDiag(diag::err_incorrect_defaulted_exception_spec) << CSM, 4131 PDiag(), ImplicitType, SourceLocation(), Type, MD->getLocation())) 4132 HadError = true; 4133 4134 // If a function is explicitly defaulted on its first declaration, 4135 if (First) { 4136 // -- it is implicitly considered to be constexpr if the implicit 4137 // definition would be, 4138 MD->setConstexpr(Constexpr); 4139 4140 // -- it is implicitly considered to have the same exception-specification 4141 // as if it had been implicitly declared, 4142 MD->setType(QualType(ImplicitType, 0)); 4143 4144 // Such a function is also trivial if the implicitly-declared function 4145 // would have been. 4146 MD->setTrivial(Trivial); 4147 } 4148 4149 if (ShouldDeleteSpecialMember(MD, CSM)) { 4150 if (First) { 4151 MD->setDeletedAsWritten(); 4152 } else { 4153 // C++11 [dcl.fct.def.default]p4: 4154 // [For a] user-provided explicitly-defaulted function [...] if such a 4155 // function is implicitly defined as deleted, the program is ill-formed. 4156 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) << CSM; 4157 HadError = true; 4158 } 4159 } 4160 4161 if (HadError) 4162 MD->setInvalidDecl(); 4163} 4164 4165namespace { 4166struct SpecialMemberDeletionInfo { 4167 Sema &S; 4168 CXXMethodDecl *MD; 4169 Sema::CXXSpecialMember CSM; 4170 bool Diagnose; 4171 4172 // Properties of the special member, computed for convenience. 4173 bool IsConstructor, IsAssignment, IsMove, ConstArg, VolatileArg; 4174 SourceLocation Loc; 4175 4176 bool AllFieldsAreConst; 4177 4178 SpecialMemberDeletionInfo(Sema &S, CXXMethodDecl *MD, 4179 Sema::CXXSpecialMember CSM, bool Diagnose) 4180 : S(S), MD(MD), CSM(CSM), Diagnose(Diagnose), 4181 IsConstructor(false), IsAssignment(false), IsMove(false), 4182 ConstArg(false), VolatileArg(false), Loc(MD->getLocation()), 4183 AllFieldsAreConst(true) { 4184 switch (CSM) { 4185 case Sema::CXXDefaultConstructor: 4186 case Sema::CXXCopyConstructor: 4187 IsConstructor = true; 4188 break; 4189 case Sema::CXXMoveConstructor: 4190 IsConstructor = true; 4191 IsMove = true; 4192 break; 4193 case Sema::CXXCopyAssignment: 4194 IsAssignment = true; 4195 break; 4196 case Sema::CXXMoveAssignment: 4197 IsAssignment = true; 4198 IsMove = true; 4199 break; 4200 case Sema::CXXDestructor: 4201 break; 4202 case Sema::CXXInvalid: 4203 llvm_unreachable("invalid special member kind"); 4204 } 4205 4206 if (MD->getNumParams()) { 4207 ConstArg = MD->getParamDecl(0)->getType().isConstQualified(); 4208 VolatileArg = MD->getParamDecl(0)->getType().isVolatileQualified(); 4209 } 4210 } 4211 4212 bool inUnion() const { return MD->getParent()->isUnion(); } 4213 4214 /// Look up the corresponding special member in the given class. 4215 Sema::SpecialMemberOverloadResult *lookupIn(CXXRecordDecl *Class) { 4216 unsigned TQ = MD->getTypeQualifiers(); 4217 return S.LookupSpecialMember(Class, CSM, ConstArg, VolatileArg, 4218 MD->getRefQualifier() == RQ_RValue, 4219 TQ & Qualifiers::Const, 4220 TQ & Qualifiers::Volatile); 4221 } 4222 4223 typedef llvm::PointerUnion<CXXBaseSpecifier*, FieldDecl*> Subobject; 4224 4225 bool shouldDeleteForBase(CXXBaseSpecifier *Base); 4226 bool shouldDeleteForField(FieldDecl *FD); 4227 bool shouldDeleteForAllConstMembers(); 4228 4229 bool shouldDeleteForClassSubobject(CXXRecordDecl *Class, Subobject Subobj); 4230 bool shouldDeleteForSubobjectCall(Subobject Subobj, 4231 Sema::SpecialMemberOverloadResult *SMOR, 4232 bool IsDtorCallInCtor); 4233 4234 bool isAccessible(Subobject Subobj, CXXMethodDecl *D); 4235}; 4236} 4237 4238/// Is the given special member inaccessible when used on the given 4239/// sub-object. 4240bool SpecialMemberDeletionInfo::isAccessible(Subobject Subobj, 4241 CXXMethodDecl *target) { 4242 /// If we're operating on a base class, the object type is the 4243 /// type of this special member. 4244 QualType objectTy; 4245 AccessSpecifier access = target->getAccess();; 4246 if (CXXBaseSpecifier *base = Subobj.dyn_cast<CXXBaseSpecifier*>()) { 4247 objectTy = S.Context.getTypeDeclType(MD->getParent()); 4248 access = CXXRecordDecl::MergeAccess(base->getAccessSpecifier(), access); 4249 4250 // If we're operating on a field, the object type is the type of the field. 4251 } else { 4252 objectTy = S.Context.getTypeDeclType(target->getParent()); 4253 } 4254 4255 return S.isSpecialMemberAccessibleForDeletion(target, access, objectTy); 4256} 4257 4258/// Check whether we should delete a special member due to the implicit 4259/// definition containing a call to a special member of a subobject. 4260bool SpecialMemberDeletionInfo::shouldDeleteForSubobjectCall( 4261 Subobject Subobj, Sema::SpecialMemberOverloadResult *SMOR, 4262 bool IsDtorCallInCtor) { 4263 CXXMethodDecl *Decl = SMOR->getMethod(); 4264 FieldDecl *Field = Subobj.dyn_cast<FieldDecl*>(); 4265 4266 int DiagKind = -1; 4267 4268 if (SMOR->getKind() == Sema::SpecialMemberOverloadResult::NoMemberOrDeleted) 4269 DiagKind = !Decl ? 0 : 1; 4270 else if (SMOR->getKind() == Sema::SpecialMemberOverloadResult::Ambiguous) 4271 DiagKind = 2; 4272 else if (!isAccessible(Subobj, Decl)) 4273 DiagKind = 3; 4274 else if (!IsDtorCallInCtor && Field && Field->getParent()->isUnion() && 4275 !Decl->isTrivial()) { 4276 // A member of a union must have a trivial corresponding special member. 4277 // As a weird special case, a destructor call from a union's constructor 4278 // must be accessible and non-deleted, but need not be trivial. Such a 4279 // destructor is never actually called, but is semantically checked as 4280 // if it were. 4281 DiagKind = 4; 4282 } 4283 4284 if (DiagKind == -1) 4285 return false; 4286 4287 if (Diagnose) { 4288 if (Field) { 4289 S.Diag(Field->getLocation(), 4290 diag::note_deleted_special_member_class_subobject) 4291 << CSM << MD->getParent() << /*IsField*/true 4292 << Field << DiagKind << IsDtorCallInCtor; 4293 } else { 4294 CXXBaseSpecifier *Base = Subobj.get<CXXBaseSpecifier*>(); 4295 S.Diag(Base->getLocStart(), 4296 diag::note_deleted_special_member_class_subobject) 4297 << CSM << MD->getParent() << /*IsField*/false 4298 << Base->getType() << DiagKind << IsDtorCallInCtor; 4299 } 4300 4301 if (DiagKind == 1) 4302 S.NoteDeletedFunction(Decl); 4303 // FIXME: Explain inaccessibility if DiagKind == 3. 4304 } 4305 4306 return true; 4307} 4308 4309/// Check whether we should delete a special member function due to having a 4310/// direct or virtual base class or static data member of class type M. 4311bool SpecialMemberDeletionInfo::shouldDeleteForClassSubobject( 4312 CXXRecordDecl *Class, Subobject Subobj) { 4313 FieldDecl *Field = Subobj.dyn_cast<FieldDecl*>(); 4314 4315 // C++11 [class.ctor]p5: 4316 // -- any direct or virtual base class, or non-static data member with no 4317 // brace-or-equal-initializer, has class type M (or array thereof) and 4318 // either M has no default constructor or overload resolution as applied 4319 // to M's default constructor results in an ambiguity or in a function 4320 // that is deleted or inaccessible 4321 // C++11 [class.copy]p11, C++11 [class.copy]p23: 4322 // -- a direct or virtual base class B that cannot be copied/moved because 4323 // overload resolution, as applied to B's corresponding special member, 4324 // results in an ambiguity or a function that is deleted or inaccessible 4325 // from the defaulted special member 4326 // C++11 [class.dtor]p5: 4327 // -- any direct or virtual base class [...] has a type with a destructor 4328 // that is deleted or inaccessible 4329 if (!(CSM == Sema::CXXDefaultConstructor && 4330 Field && Field->hasInClassInitializer()) && 4331 shouldDeleteForSubobjectCall(Subobj, lookupIn(Class), false)) 4332 return true; 4333 4334 // C++11 [class.ctor]p5, C++11 [class.copy]p11: 4335 // -- any direct or virtual base class or non-static data member has a 4336 // type with a destructor that is deleted or inaccessible 4337 if (IsConstructor) { 4338 Sema::SpecialMemberOverloadResult *SMOR = 4339 S.LookupSpecialMember(Class, Sema::CXXDestructor, 4340 false, false, false, false, false); 4341 if (shouldDeleteForSubobjectCall(Subobj, SMOR, true)) 4342 return true; 4343 } 4344 4345 return false; 4346} 4347 4348/// Check whether we should delete a special member function due to the class 4349/// having a particular direct or virtual base class. 4350bool SpecialMemberDeletionInfo::shouldDeleteForBase(CXXBaseSpecifier *Base) { 4351 CXXRecordDecl *BaseClass = Base->getType()->getAsCXXRecordDecl(); 4352 return shouldDeleteForClassSubobject(BaseClass, Base); 4353} 4354 4355/// Check whether we should delete a special member function due to the class 4356/// having a particular non-static data member. 4357bool SpecialMemberDeletionInfo::shouldDeleteForField(FieldDecl *FD) { 4358 QualType FieldType = S.Context.getBaseElementType(FD->getType()); 4359 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4360 4361 if (CSM == Sema::CXXDefaultConstructor) { 4362 // For a default constructor, all references must be initialized in-class 4363 // and, if a union, it must have a non-const member. 4364 if (FieldType->isReferenceType() && !FD->hasInClassInitializer()) { 4365 if (Diagnose) 4366 S.Diag(FD->getLocation(), diag::note_deleted_default_ctor_uninit_field) 4367 << MD->getParent() << FD << FieldType << /*Reference*/0; 4368 return true; 4369 } 4370 // C++11 [class.ctor]p5: any non-variant non-static data member of 4371 // const-qualified type (or array thereof) with no 4372 // brace-or-equal-initializer does not have a user-provided default 4373 // constructor. 4374 if (!inUnion() && FieldType.isConstQualified() && 4375 !FD->hasInClassInitializer() && 4376 (!FieldRecord || !FieldRecord->hasUserProvidedDefaultConstructor())) { 4377 if (Diagnose) 4378 S.Diag(FD->getLocation(), diag::note_deleted_default_ctor_uninit_field) 4379 << MD->getParent() << FD << FD->getType() << /*Const*/1; 4380 return true; 4381 } 4382 4383 if (inUnion() && !FieldType.isConstQualified()) 4384 AllFieldsAreConst = false; 4385 } else if (CSM == Sema::CXXCopyConstructor) { 4386 // For a copy constructor, data members must not be of rvalue reference 4387 // type. 4388 if (FieldType->isRValueReferenceType()) { 4389 if (Diagnose) 4390 S.Diag(FD->getLocation(), diag::note_deleted_copy_ctor_rvalue_reference) 4391 << MD->getParent() << FD << FieldType; 4392 return true; 4393 } 4394 } else if (IsAssignment) { 4395 // For an assignment operator, data members must not be of reference type. 4396 if (FieldType->isReferenceType()) { 4397 if (Diagnose) 4398 S.Diag(FD->getLocation(), diag::note_deleted_assign_field) 4399 << IsMove << MD->getParent() << FD << FieldType << /*Reference*/0; 4400 return true; 4401 } 4402 if (!FieldRecord && FieldType.isConstQualified()) { 4403 // C++11 [class.copy]p23: 4404 // -- a non-static data member of const non-class type (or array thereof) 4405 if (Diagnose) 4406 S.Diag(FD->getLocation(), diag::note_deleted_assign_field) 4407 << IsMove << MD->getParent() << FD << FD->getType() << /*Const*/1; 4408 return true; 4409 } 4410 } 4411 4412 if (FieldRecord) { 4413 // Some additional restrictions exist on the variant members. 4414 if (!inUnion() && FieldRecord->isUnion() && 4415 FieldRecord->isAnonymousStructOrUnion()) { 4416 bool AllVariantFieldsAreConst = true; 4417 4418 // FIXME: Handle anonymous unions declared within anonymous unions. 4419 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4420 UE = FieldRecord->field_end(); 4421 UI != UE; ++UI) { 4422 QualType UnionFieldType = S.Context.getBaseElementType(UI->getType()); 4423 4424 if (!UnionFieldType.isConstQualified()) 4425 AllVariantFieldsAreConst = false; 4426 4427 CXXRecordDecl *UnionFieldRecord = UnionFieldType->getAsCXXRecordDecl(); 4428 if (UnionFieldRecord && 4429 shouldDeleteForClassSubobject(UnionFieldRecord, *UI)) 4430 return true; 4431 } 4432 4433 // At least one member in each anonymous union must be non-const 4434 if (CSM == Sema::CXXDefaultConstructor && AllVariantFieldsAreConst && 4435 FieldRecord->field_begin() != FieldRecord->field_end()) { 4436 if (Diagnose) 4437 S.Diag(FieldRecord->getLocation(), 4438 diag::note_deleted_default_ctor_all_const) 4439 << MD->getParent() << /*anonymous union*/1; 4440 return true; 4441 } 4442 4443 // Don't check the implicit member of the anonymous union type. 4444 // This is technically non-conformant, but sanity demands it. 4445 return false; 4446 } 4447 4448 if (shouldDeleteForClassSubobject(FieldRecord, FD)) 4449 return true; 4450 } 4451 4452 return false; 4453} 4454 4455/// C++11 [class.ctor] p5: 4456/// A defaulted default constructor for a class X is defined as deleted if 4457/// X is a union and all of its variant members are of const-qualified type. 4458bool SpecialMemberDeletionInfo::shouldDeleteForAllConstMembers() { 4459 // This is a silly definition, because it gives an empty union a deleted 4460 // default constructor. Don't do that. 4461 if (CSM == Sema::CXXDefaultConstructor && inUnion() && AllFieldsAreConst && 4462 (MD->getParent()->field_begin() != MD->getParent()->field_end())) { 4463 if (Diagnose) 4464 S.Diag(MD->getParent()->getLocation(), 4465 diag::note_deleted_default_ctor_all_const) 4466 << MD->getParent() << /*not anonymous union*/0; 4467 return true; 4468 } 4469 return false; 4470} 4471 4472/// Determine whether a defaulted special member function should be defined as 4473/// deleted, as specified in C++11 [class.ctor]p5, C++11 [class.copy]p11, 4474/// C++11 [class.copy]p23, and C++11 [class.dtor]p5. 4475bool Sema::ShouldDeleteSpecialMember(CXXMethodDecl *MD, CXXSpecialMember CSM, 4476 bool Diagnose) { 4477 assert(!MD->isInvalidDecl()); 4478 CXXRecordDecl *RD = MD->getParent(); 4479 assert(!RD->isDependentType() && "do deletion after instantiation"); 4480 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4481 return false; 4482 4483 // C++11 [expr.lambda.prim]p19: 4484 // The closure type associated with a lambda-expression has a 4485 // deleted (8.4.3) default constructor and a deleted copy 4486 // assignment operator. 4487 if (RD->isLambda() && 4488 (CSM == CXXDefaultConstructor || CSM == CXXCopyAssignment)) { 4489 if (Diagnose) 4490 Diag(RD->getLocation(), diag::note_lambda_decl); 4491 return true; 4492 } 4493 4494 // For an anonymous struct or union, the copy and assignment special members 4495 // will never be used, so skip the check. For an anonymous union declared at 4496 // namespace scope, the constructor and destructor are used. 4497 if (CSM != CXXDefaultConstructor && CSM != CXXDestructor && 4498 RD->isAnonymousStructOrUnion()) 4499 return false; 4500 4501 // C++11 [class.copy]p7, p18: 4502 // If the class definition declares a move constructor or move assignment 4503 // operator, an implicitly declared copy constructor or copy assignment 4504 // operator is defined as deleted. 4505 if (MD->isImplicit() && 4506 (CSM == CXXCopyConstructor || CSM == CXXCopyAssignment)) { 4507 CXXMethodDecl *UserDeclaredMove = 0; 4508 4509 // In Microsoft mode, a user-declared move only causes the deletion of the 4510 // corresponding copy operation, not both copy operations. 4511 if (RD->hasUserDeclaredMoveConstructor() && 4512 (!getLangOpts().MicrosoftMode || CSM == CXXCopyConstructor)) { 4513 if (!Diagnose) return true; 4514 UserDeclaredMove = RD->getMoveConstructor(); 4515 assert(UserDeclaredMove); 4516 } else if (RD->hasUserDeclaredMoveAssignment() && 4517 (!getLangOpts().MicrosoftMode || CSM == CXXCopyAssignment)) { 4518 if (!Diagnose) return true; 4519 UserDeclaredMove = RD->getMoveAssignmentOperator(); 4520 assert(UserDeclaredMove); 4521 } 4522 4523 if (UserDeclaredMove) { 4524 Diag(UserDeclaredMove->getLocation(), 4525 diag::note_deleted_copy_user_declared_move) 4526 << (CSM == CXXCopyAssignment) << RD 4527 << UserDeclaredMove->isMoveAssignmentOperator(); 4528 return true; 4529 } 4530 } 4531 4532 // Do access control from the special member function 4533 ContextRAII MethodContext(*this, MD); 4534 4535 // C++11 [class.dtor]p5: 4536 // -- for a virtual destructor, lookup of the non-array deallocation function 4537 // results in an ambiguity or in a function that is deleted or inaccessible 4538 if (CSM == CXXDestructor && MD->isVirtual()) { 4539 FunctionDecl *OperatorDelete = 0; 4540 DeclarationName Name = 4541 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 4542 if (FindDeallocationFunction(MD->getLocation(), MD->getParent(), Name, 4543 OperatorDelete, false)) { 4544 if (Diagnose) 4545 Diag(RD->getLocation(), diag::note_deleted_dtor_no_operator_delete); 4546 return true; 4547 } 4548 } 4549 4550 SpecialMemberDeletionInfo SMI(*this, MD, CSM, Diagnose); 4551 4552 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4553 BE = RD->bases_end(); BI != BE; ++BI) 4554 if (!BI->isVirtual() && 4555 SMI.shouldDeleteForBase(BI)) 4556 return true; 4557 4558 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 4559 BE = RD->vbases_end(); BI != BE; ++BI) 4560 if (SMI.shouldDeleteForBase(BI)) 4561 return true; 4562 4563 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4564 FE = RD->field_end(); FI != FE; ++FI) 4565 if (!FI->isInvalidDecl() && !FI->isUnnamedBitfield() && 4566 SMI.shouldDeleteForField(*FI)) 4567 return true; 4568 4569 if (SMI.shouldDeleteForAllConstMembers()) 4570 return true; 4571 4572 return false; 4573} 4574 4575/// \brief Data used with FindHiddenVirtualMethod 4576namespace { 4577 struct FindHiddenVirtualMethodData { 4578 Sema *S; 4579 CXXMethodDecl *Method; 4580 llvm::SmallPtrSet<const CXXMethodDecl *, 8> OverridenAndUsingBaseMethods; 4581 SmallVector<CXXMethodDecl *, 8> OverloadedMethods; 4582 }; 4583} 4584 4585/// \brief Member lookup function that determines whether a given C++ 4586/// method overloads virtual methods in a base class without overriding any, 4587/// to be used with CXXRecordDecl::lookupInBases(). 4588static bool FindHiddenVirtualMethod(const CXXBaseSpecifier *Specifier, 4589 CXXBasePath &Path, 4590 void *UserData) { 4591 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 4592 4593 FindHiddenVirtualMethodData &Data 4594 = *static_cast<FindHiddenVirtualMethodData*>(UserData); 4595 4596 DeclarationName Name = Data.Method->getDeclName(); 4597 assert(Name.getNameKind() == DeclarationName::Identifier); 4598 4599 bool foundSameNameMethod = false; 4600 SmallVector<CXXMethodDecl *, 8> overloadedMethods; 4601 for (Path.Decls = BaseRecord->lookup(Name); 4602 Path.Decls.first != Path.Decls.second; 4603 ++Path.Decls.first) { 4604 NamedDecl *D = *Path.Decls.first; 4605 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 4606 MD = MD->getCanonicalDecl(); 4607 foundSameNameMethod = true; 4608 // Interested only in hidden virtual methods. 4609 if (!MD->isVirtual()) 4610 continue; 4611 // If the method we are checking overrides a method from its base 4612 // don't warn about the other overloaded methods. 4613 if (!Data.S->IsOverload(Data.Method, MD, false)) 4614 return true; 4615 // Collect the overload only if its hidden. 4616 if (!Data.OverridenAndUsingBaseMethods.count(MD)) 4617 overloadedMethods.push_back(MD); 4618 } 4619 } 4620 4621 if (foundSameNameMethod) 4622 Data.OverloadedMethods.append(overloadedMethods.begin(), 4623 overloadedMethods.end()); 4624 return foundSameNameMethod; 4625} 4626 4627/// \brief See if a method overloads virtual methods in a base class without 4628/// overriding any. 4629void Sema::DiagnoseHiddenVirtualMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 4630 if (Diags.getDiagnosticLevel(diag::warn_overloaded_virtual, 4631 MD->getLocation()) == DiagnosticsEngine::Ignored) 4632 return; 4633 if (!MD->getDeclName().isIdentifier()) 4634 return; 4635 4636 CXXBasePaths Paths(/*FindAmbiguities=*/true, // true to look in all bases. 4637 /*bool RecordPaths=*/false, 4638 /*bool DetectVirtual=*/false); 4639 FindHiddenVirtualMethodData Data; 4640 Data.Method = MD; 4641 Data.S = this; 4642 4643 // Keep the base methods that were overriden or introduced in the subclass 4644 // by 'using' in a set. A base method not in this set is hidden. 4645 for (DeclContext::lookup_result res = DC->lookup(MD->getDeclName()); 4646 res.first != res.second; ++res.first) { 4647 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*res.first)) 4648 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 4649 E = MD->end_overridden_methods(); 4650 I != E; ++I) 4651 Data.OverridenAndUsingBaseMethods.insert((*I)->getCanonicalDecl()); 4652 if (UsingShadowDecl *shad = dyn_cast<UsingShadowDecl>(*res.first)) 4653 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(shad->getTargetDecl())) 4654 Data.OverridenAndUsingBaseMethods.insert(MD->getCanonicalDecl()); 4655 } 4656 4657 if (DC->lookupInBases(&FindHiddenVirtualMethod, &Data, Paths) && 4658 !Data.OverloadedMethods.empty()) { 4659 Diag(MD->getLocation(), diag::warn_overloaded_virtual) 4660 << MD << (Data.OverloadedMethods.size() > 1); 4661 4662 for (unsigned i = 0, e = Data.OverloadedMethods.size(); i != e; ++i) { 4663 CXXMethodDecl *overloadedMD = Data.OverloadedMethods[i]; 4664 Diag(overloadedMD->getLocation(), 4665 diag::note_hidden_overloaded_virtual_declared_here) << overloadedMD; 4666 } 4667 } 4668} 4669 4670void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 4671 Decl *TagDecl, 4672 SourceLocation LBrac, 4673 SourceLocation RBrac, 4674 AttributeList *AttrList) { 4675 if (!TagDecl) 4676 return; 4677 4678 AdjustDeclIfTemplate(TagDecl); 4679 4680 ActOnFields(S, RLoc, TagDecl, llvm::makeArrayRef( 4681 // strict aliasing violation! 4682 reinterpret_cast<Decl**>(FieldCollector->getCurFields()), 4683 FieldCollector->getCurNumFields()), LBrac, RBrac, AttrList); 4684 4685 CheckCompletedCXXClass( 4686 dyn_cast_or_null<CXXRecordDecl>(TagDecl)); 4687} 4688 4689/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 4690/// special functions, such as the default constructor, copy 4691/// constructor, or destructor, to the given C++ class (C++ 4692/// [special]p1). This routine can only be executed just before the 4693/// definition of the class is complete. 4694void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 4695 if (!ClassDecl->hasUserDeclaredConstructor()) 4696 ++ASTContext::NumImplicitDefaultConstructors; 4697 4698 if (!ClassDecl->hasUserDeclaredCopyConstructor()) 4699 ++ASTContext::NumImplicitCopyConstructors; 4700 4701 if (getLangOpts().CPlusPlus0x && ClassDecl->needsImplicitMoveConstructor()) 4702 ++ASTContext::NumImplicitMoveConstructors; 4703 4704 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 4705 ++ASTContext::NumImplicitCopyAssignmentOperators; 4706 4707 // If we have a dynamic class, then the copy assignment operator may be 4708 // virtual, so we have to declare it immediately. This ensures that, e.g., 4709 // it shows up in the right place in the vtable and that we diagnose 4710 // problems with the implicit exception specification. 4711 if (ClassDecl->isDynamicClass()) 4712 DeclareImplicitCopyAssignment(ClassDecl); 4713 } 4714 4715 if (getLangOpts().CPlusPlus0x && ClassDecl->needsImplicitMoveAssignment()) { 4716 ++ASTContext::NumImplicitMoveAssignmentOperators; 4717 4718 // Likewise for the move assignment operator. 4719 if (ClassDecl->isDynamicClass()) 4720 DeclareImplicitMoveAssignment(ClassDecl); 4721 } 4722 4723 if (!ClassDecl->hasUserDeclaredDestructor()) { 4724 ++ASTContext::NumImplicitDestructors; 4725 4726 // If we have a dynamic class, then the destructor may be virtual, so we 4727 // have to declare the destructor immediately. This ensures that, e.g., it 4728 // shows up in the right place in the vtable and that we diagnose problems 4729 // with the implicit exception specification. 4730 if (ClassDecl->isDynamicClass()) 4731 DeclareImplicitDestructor(ClassDecl); 4732 } 4733} 4734 4735void Sema::ActOnReenterDeclaratorTemplateScope(Scope *S, DeclaratorDecl *D) { 4736 if (!D) 4737 return; 4738 4739 int NumParamList = D->getNumTemplateParameterLists(); 4740 for (int i = 0; i < NumParamList; i++) { 4741 TemplateParameterList* Params = D->getTemplateParameterList(i); 4742 for (TemplateParameterList::iterator Param = Params->begin(), 4743 ParamEnd = Params->end(); 4744 Param != ParamEnd; ++Param) { 4745 NamedDecl *Named = cast<NamedDecl>(*Param); 4746 if (Named->getDeclName()) { 4747 S->AddDecl(Named); 4748 IdResolver.AddDecl(Named); 4749 } 4750 } 4751 } 4752} 4753 4754void Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) { 4755 if (!D) 4756 return; 4757 4758 TemplateParameterList *Params = 0; 4759 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 4760 Params = Template->getTemplateParameters(); 4761 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 4762 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 4763 Params = PartialSpec->getTemplateParameters(); 4764 else 4765 return; 4766 4767 for (TemplateParameterList::iterator Param = Params->begin(), 4768 ParamEnd = Params->end(); 4769 Param != ParamEnd; ++Param) { 4770 NamedDecl *Named = cast<NamedDecl>(*Param); 4771 if (Named->getDeclName()) { 4772 S->AddDecl(Named); 4773 IdResolver.AddDecl(Named); 4774 } 4775 } 4776} 4777 4778void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 4779 if (!RecordD) return; 4780 AdjustDeclIfTemplate(RecordD); 4781 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD); 4782 PushDeclContext(S, Record); 4783} 4784 4785void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 4786 if (!RecordD) return; 4787 PopDeclContext(); 4788} 4789 4790/// ActOnStartDelayedCXXMethodDeclaration - We have completed 4791/// parsing a top-level (non-nested) C++ class, and we are now 4792/// parsing those parts of the given Method declaration that could 4793/// not be parsed earlier (C++ [class.mem]p2), such as default 4794/// arguments. This action should enter the scope of the given 4795/// Method declaration as if we had just parsed the qualified method 4796/// name. However, it should not bring the parameters into scope; 4797/// that will be performed by ActOnDelayedCXXMethodParameter. 4798void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 4799} 4800 4801/// ActOnDelayedCXXMethodParameter - We've already started a delayed 4802/// C++ method declaration. We're (re-)introducing the given 4803/// function parameter into scope for use in parsing later parts of 4804/// the method declaration. For example, we could see an 4805/// ActOnParamDefaultArgument event for this parameter. 4806void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) { 4807 if (!ParamD) 4808 return; 4809 4810 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD); 4811 4812 // If this parameter has an unparsed default argument, clear it out 4813 // to make way for the parsed default argument. 4814 if (Param->hasUnparsedDefaultArg()) 4815 Param->setDefaultArg(0); 4816 4817 S->AddDecl(Param); 4818 if (Param->getDeclName()) 4819 IdResolver.AddDecl(Param); 4820} 4821 4822/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 4823/// processing the delayed method declaration for Method. The method 4824/// declaration is now considered finished. There may be a separate 4825/// ActOnStartOfFunctionDef action later (not necessarily 4826/// immediately!) for this method, if it was also defined inside the 4827/// class body. 4828void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 4829 if (!MethodD) 4830 return; 4831 4832 AdjustDeclIfTemplate(MethodD); 4833 4834 FunctionDecl *Method = cast<FunctionDecl>(MethodD); 4835 4836 // Now that we have our default arguments, check the constructor 4837 // again. It could produce additional diagnostics or affect whether 4838 // the class has implicitly-declared destructors, among other 4839 // things. 4840 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 4841 CheckConstructor(Constructor); 4842 4843 // Check the default arguments, which we may have added. 4844 if (!Method->isInvalidDecl()) 4845 CheckCXXDefaultArguments(Method); 4846} 4847 4848/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 4849/// the well-formedness of the constructor declarator @p D with type @p 4850/// R. If there are any errors in the declarator, this routine will 4851/// emit diagnostics and set the invalid bit to true. In any case, the type 4852/// will be updated to reflect a well-formed type for the constructor and 4853/// returned. 4854QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 4855 StorageClass &SC) { 4856 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 4857 4858 // C++ [class.ctor]p3: 4859 // A constructor shall not be virtual (10.3) or static (9.4). A 4860 // constructor can be invoked for a const, volatile or const 4861 // volatile object. A constructor shall not be declared const, 4862 // volatile, or const volatile (9.3.2). 4863 if (isVirtual) { 4864 if (!D.isInvalidType()) 4865 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 4866 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 4867 << SourceRange(D.getIdentifierLoc()); 4868 D.setInvalidType(); 4869 } 4870 if (SC == SC_Static) { 4871 if (!D.isInvalidType()) 4872 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 4873 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 4874 << SourceRange(D.getIdentifierLoc()); 4875 D.setInvalidType(); 4876 SC = SC_None; 4877 } 4878 4879 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 4880 if (FTI.TypeQuals != 0) { 4881 if (FTI.TypeQuals & Qualifiers::Const) 4882 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 4883 << "const" << SourceRange(D.getIdentifierLoc()); 4884 if (FTI.TypeQuals & Qualifiers::Volatile) 4885 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 4886 << "volatile" << SourceRange(D.getIdentifierLoc()); 4887 if (FTI.TypeQuals & Qualifiers::Restrict) 4888 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 4889 << "restrict" << SourceRange(D.getIdentifierLoc()); 4890 D.setInvalidType(); 4891 } 4892 4893 // C++0x [class.ctor]p4: 4894 // A constructor shall not be declared with a ref-qualifier. 4895 if (FTI.hasRefQualifier()) { 4896 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_constructor) 4897 << FTI.RefQualifierIsLValueRef 4898 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 4899 D.setInvalidType(); 4900 } 4901 4902 // Rebuild the function type "R" without any type qualifiers (in 4903 // case any of the errors above fired) and with "void" as the 4904 // return type, since constructors don't have return types. 4905 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 4906 if (Proto->getResultType() == Context.VoidTy && !D.isInvalidType()) 4907 return R; 4908 4909 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 4910 EPI.TypeQuals = 0; 4911 EPI.RefQualifier = RQ_None; 4912 4913 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 4914 Proto->getNumArgs(), EPI); 4915} 4916 4917/// CheckConstructor - Checks a fully-formed constructor for 4918/// well-formedness, issuing any diagnostics required. Returns true if 4919/// the constructor declarator is invalid. 4920void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 4921 CXXRecordDecl *ClassDecl 4922 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 4923 if (!ClassDecl) 4924 return Constructor->setInvalidDecl(); 4925 4926 // C++ [class.copy]p3: 4927 // A declaration of a constructor for a class X is ill-formed if 4928 // its first parameter is of type (optionally cv-qualified) X and 4929 // either there are no other parameters or else all other 4930 // parameters have default arguments. 4931 if (!Constructor->isInvalidDecl() && 4932 ((Constructor->getNumParams() == 1) || 4933 (Constructor->getNumParams() > 1 && 4934 Constructor->getParamDecl(1)->hasDefaultArg())) && 4935 Constructor->getTemplateSpecializationKind() 4936 != TSK_ImplicitInstantiation) { 4937 QualType ParamType = Constructor->getParamDecl(0)->getType(); 4938 QualType ClassTy = Context.getTagDeclType(ClassDecl); 4939 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 4940 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 4941 const char *ConstRef 4942 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 4943 : " const &"; 4944 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 4945 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 4946 4947 // FIXME: Rather that making the constructor invalid, we should endeavor 4948 // to fix the type. 4949 Constructor->setInvalidDecl(); 4950 } 4951 } 4952} 4953 4954/// CheckDestructor - Checks a fully-formed destructor definition for 4955/// well-formedness, issuing any diagnostics required. Returns true 4956/// on error. 4957bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 4958 CXXRecordDecl *RD = Destructor->getParent(); 4959 4960 if (Destructor->isVirtual()) { 4961 SourceLocation Loc; 4962 4963 if (!Destructor->isImplicit()) 4964 Loc = Destructor->getLocation(); 4965 else 4966 Loc = RD->getLocation(); 4967 4968 // If we have a virtual destructor, look up the deallocation function 4969 FunctionDecl *OperatorDelete = 0; 4970 DeclarationName Name = 4971 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 4972 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 4973 return true; 4974 4975 MarkFunctionReferenced(Loc, OperatorDelete); 4976 4977 Destructor->setOperatorDelete(OperatorDelete); 4978 } 4979 4980 return false; 4981} 4982 4983static inline bool 4984FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 4985 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 4986 FTI.ArgInfo[0].Param && 4987 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()); 4988} 4989 4990/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 4991/// the well-formednes of the destructor declarator @p D with type @p 4992/// R. If there are any errors in the declarator, this routine will 4993/// emit diagnostics and set the declarator to invalid. Even if this happens, 4994/// will be updated to reflect a well-formed type for the destructor and 4995/// returned. 4996QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, 4997 StorageClass& SC) { 4998 // C++ [class.dtor]p1: 4999 // [...] A typedef-name that names a class is a class-name 5000 // (7.1.3); however, a typedef-name that names a class shall not 5001 // be used as the identifier in the declarator for a destructor 5002 // declaration. 5003 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 5004 if (const TypedefType *TT = DeclaratorType->getAs<TypedefType>()) 5005 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 5006 << DeclaratorType << isa<TypeAliasDecl>(TT->getDecl()); 5007 else if (const TemplateSpecializationType *TST = 5008 DeclaratorType->getAs<TemplateSpecializationType>()) 5009 if (TST->isTypeAlias()) 5010 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 5011 << DeclaratorType << 1; 5012 5013 // C++ [class.dtor]p2: 5014 // A destructor is used to destroy objects of its class type. A 5015 // destructor takes no parameters, and no return type can be 5016 // specified for it (not even void). The address of a destructor 5017 // shall not be taken. A destructor shall not be static. A 5018 // destructor can be invoked for a const, volatile or const 5019 // volatile object. A destructor shall not be declared const, 5020 // volatile or const volatile (9.3.2). 5021 if (SC == SC_Static) { 5022 if (!D.isInvalidType()) 5023 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 5024 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5025 << SourceRange(D.getIdentifierLoc()) 5026 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 5027 5028 SC = SC_None; 5029 } 5030 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 5031 // Destructors don't have return types, but the parser will 5032 // happily parse something like: 5033 // 5034 // class X { 5035 // float ~X(); 5036 // }; 5037 // 5038 // The return type will be eliminated later. 5039 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 5040 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 5041 << SourceRange(D.getIdentifierLoc()); 5042 } 5043 5044 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5045 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 5046 if (FTI.TypeQuals & Qualifiers::Const) 5047 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5048 << "const" << SourceRange(D.getIdentifierLoc()); 5049 if (FTI.TypeQuals & Qualifiers::Volatile) 5050 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5051 << "volatile" << SourceRange(D.getIdentifierLoc()); 5052 if (FTI.TypeQuals & Qualifiers::Restrict) 5053 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5054 << "restrict" << SourceRange(D.getIdentifierLoc()); 5055 D.setInvalidType(); 5056 } 5057 5058 // C++0x [class.dtor]p2: 5059 // A destructor shall not be declared with a ref-qualifier. 5060 if (FTI.hasRefQualifier()) { 5061 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_destructor) 5062 << FTI.RefQualifierIsLValueRef 5063 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 5064 D.setInvalidType(); 5065 } 5066 5067 // Make sure we don't have any parameters. 5068 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 5069 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 5070 5071 // Delete the parameters. 5072 FTI.freeArgs(); 5073 D.setInvalidType(); 5074 } 5075 5076 // Make sure the destructor isn't variadic. 5077 if (FTI.isVariadic) { 5078 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 5079 D.setInvalidType(); 5080 } 5081 5082 // Rebuild the function type "R" without any type qualifiers or 5083 // parameters (in case any of the errors above fired) and with 5084 // "void" as the return type, since destructors don't have return 5085 // types. 5086 if (!D.isInvalidType()) 5087 return R; 5088 5089 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5090 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 5091 EPI.Variadic = false; 5092 EPI.TypeQuals = 0; 5093 EPI.RefQualifier = RQ_None; 5094 return Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 5095} 5096 5097/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 5098/// well-formednes of the conversion function declarator @p D with 5099/// type @p R. If there are any errors in the declarator, this routine 5100/// will emit diagnostics and return true. Otherwise, it will return 5101/// false. Either way, the type @p R will be updated to reflect a 5102/// well-formed type for the conversion operator. 5103void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 5104 StorageClass& SC) { 5105 // C++ [class.conv.fct]p1: 5106 // Neither parameter types nor return type can be specified. The 5107 // type of a conversion function (8.3.5) is "function taking no 5108 // parameter returning conversion-type-id." 5109 if (SC == SC_Static) { 5110 if (!D.isInvalidType()) 5111 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 5112 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5113 << SourceRange(D.getIdentifierLoc()); 5114 D.setInvalidType(); 5115 SC = SC_None; 5116 } 5117 5118 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 5119 5120 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 5121 // Conversion functions don't have return types, but the parser will 5122 // happily parse something like: 5123 // 5124 // class X { 5125 // float operator bool(); 5126 // }; 5127 // 5128 // The return type will be changed later anyway. 5129 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 5130 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 5131 << SourceRange(D.getIdentifierLoc()); 5132 D.setInvalidType(); 5133 } 5134 5135 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5136 5137 // Make sure we don't have any parameters. 5138 if (Proto->getNumArgs() > 0) { 5139 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 5140 5141 // Delete the parameters. 5142 D.getFunctionTypeInfo().freeArgs(); 5143 D.setInvalidType(); 5144 } else if (Proto->isVariadic()) { 5145 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 5146 D.setInvalidType(); 5147 } 5148 5149 // Diagnose "&operator bool()" and other such nonsense. This 5150 // is actually a gcc extension which we don't support. 5151 if (Proto->getResultType() != ConvType) { 5152 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 5153 << Proto->getResultType(); 5154 D.setInvalidType(); 5155 ConvType = Proto->getResultType(); 5156 } 5157 5158 // C++ [class.conv.fct]p4: 5159 // The conversion-type-id shall not represent a function type nor 5160 // an array type. 5161 if (ConvType->isArrayType()) { 5162 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 5163 ConvType = Context.getPointerType(ConvType); 5164 D.setInvalidType(); 5165 } else if (ConvType->isFunctionType()) { 5166 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 5167 ConvType = Context.getPointerType(ConvType); 5168 D.setInvalidType(); 5169 } 5170 5171 // Rebuild the function type "R" without any parameters (in case any 5172 // of the errors above fired) and with the conversion type as the 5173 // return type. 5174 if (D.isInvalidType()) 5175 R = Context.getFunctionType(ConvType, 0, 0, Proto->getExtProtoInfo()); 5176 5177 // C++0x explicit conversion operators. 5178 if (D.getDeclSpec().isExplicitSpecified()) 5179 Diag(D.getDeclSpec().getExplicitSpecLoc(), 5180 getLangOpts().CPlusPlus0x ? 5181 diag::warn_cxx98_compat_explicit_conversion_functions : 5182 diag::ext_explicit_conversion_functions) 5183 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 5184} 5185 5186/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 5187/// the declaration of the given C++ conversion function. This routine 5188/// is responsible for recording the conversion function in the C++ 5189/// class, if possible. 5190Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 5191 assert(Conversion && "Expected to receive a conversion function declaration"); 5192 5193 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 5194 5195 // Make sure we aren't redeclaring the conversion function. 5196 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 5197 5198 // C++ [class.conv.fct]p1: 5199 // [...] A conversion function is never used to convert a 5200 // (possibly cv-qualified) object to the (possibly cv-qualified) 5201 // same object type (or a reference to it), to a (possibly 5202 // cv-qualified) base class of that type (or a reference to it), 5203 // or to (possibly cv-qualified) void. 5204 // FIXME: Suppress this warning if the conversion function ends up being a 5205 // virtual function that overrides a virtual function in a base class. 5206 QualType ClassType 5207 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 5208 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 5209 ConvType = ConvTypeRef->getPointeeType(); 5210 if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared && 5211 Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) 5212 /* Suppress diagnostics for instantiations. */; 5213 else if (ConvType->isRecordType()) { 5214 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 5215 if (ConvType == ClassType) 5216 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 5217 << ClassType; 5218 else if (IsDerivedFrom(ClassType, ConvType)) 5219 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 5220 << ClassType << ConvType; 5221 } else if (ConvType->isVoidType()) { 5222 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 5223 << ClassType << ConvType; 5224 } 5225 5226 if (FunctionTemplateDecl *ConversionTemplate 5227 = Conversion->getDescribedFunctionTemplate()) 5228 return ConversionTemplate; 5229 5230 return Conversion; 5231} 5232 5233//===----------------------------------------------------------------------===// 5234// Namespace Handling 5235//===----------------------------------------------------------------------===// 5236 5237 5238 5239/// ActOnStartNamespaceDef - This is called at the start of a namespace 5240/// definition. 5241Decl *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 5242 SourceLocation InlineLoc, 5243 SourceLocation NamespaceLoc, 5244 SourceLocation IdentLoc, 5245 IdentifierInfo *II, 5246 SourceLocation LBrace, 5247 AttributeList *AttrList) { 5248 SourceLocation StartLoc = InlineLoc.isValid() ? InlineLoc : NamespaceLoc; 5249 // For anonymous namespace, take the location of the left brace. 5250 SourceLocation Loc = II ? IdentLoc : LBrace; 5251 bool IsInline = InlineLoc.isValid(); 5252 bool IsInvalid = false; 5253 bool IsStd = false; 5254 bool AddToKnown = false; 5255 Scope *DeclRegionScope = NamespcScope->getParent(); 5256 5257 NamespaceDecl *PrevNS = 0; 5258 if (II) { 5259 // C++ [namespace.def]p2: 5260 // The identifier in an original-namespace-definition shall not 5261 // have been previously defined in the declarative region in 5262 // which the original-namespace-definition appears. The 5263 // identifier in an original-namespace-definition is the name of 5264 // the namespace. Subsequently in that declarative region, it is 5265 // treated as an original-namespace-name. 5266 // 5267 // Since namespace names are unique in their scope, and we don't 5268 // look through using directives, just look for any ordinary names. 5269 5270 const unsigned IDNS = Decl::IDNS_Ordinary | Decl::IDNS_Member | 5271 Decl::IDNS_Type | Decl::IDNS_Using | Decl::IDNS_Tag | 5272 Decl::IDNS_Namespace; 5273 NamedDecl *PrevDecl = 0; 5274 for (DeclContext::lookup_result R 5275 = CurContext->getRedeclContext()->lookup(II); 5276 R.first != R.second; ++R.first) { 5277 if ((*R.first)->getIdentifierNamespace() & IDNS) { 5278 PrevDecl = *R.first; 5279 break; 5280 } 5281 } 5282 5283 PrevNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl); 5284 5285 if (PrevNS) { 5286 // This is an extended namespace definition. 5287 if (IsInline != PrevNS->isInline()) { 5288 // inline-ness must match 5289 if (PrevNS->isInline()) { 5290 // The user probably just forgot the 'inline', so suggest that it 5291 // be added back. 5292 Diag(Loc, diag::warn_inline_namespace_reopened_noninline) 5293 << FixItHint::CreateInsertion(NamespaceLoc, "inline "); 5294 } else { 5295 Diag(Loc, diag::err_inline_namespace_mismatch) 5296 << IsInline; 5297 } 5298 Diag(PrevNS->getLocation(), diag::note_previous_definition); 5299 5300 IsInline = PrevNS->isInline(); 5301 } 5302 } else if (PrevDecl) { 5303 // This is an invalid name redefinition. 5304 Diag(Loc, diag::err_redefinition_different_kind) 5305 << II; 5306 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 5307 IsInvalid = true; 5308 // Continue on to push Namespc as current DeclContext and return it. 5309 } else if (II->isStr("std") && 5310 CurContext->getRedeclContext()->isTranslationUnit()) { 5311 // This is the first "real" definition of the namespace "std", so update 5312 // our cache of the "std" namespace to point at this definition. 5313 PrevNS = getStdNamespace(); 5314 IsStd = true; 5315 AddToKnown = !IsInline; 5316 } else { 5317 // We've seen this namespace for the first time. 5318 AddToKnown = !IsInline; 5319 } 5320 } else { 5321 // Anonymous namespaces. 5322 5323 // Determine whether the parent already has an anonymous namespace. 5324 DeclContext *Parent = CurContext->getRedeclContext(); 5325 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 5326 PrevNS = TU->getAnonymousNamespace(); 5327 } else { 5328 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 5329 PrevNS = ND->getAnonymousNamespace(); 5330 } 5331 5332 if (PrevNS && IsInline != PrevNS->isInline()) { 5333 // inline-ness must match 5334 Diag(Loc, diag::err_inline_namespace_mismatch) 5335 << IsInline; 5336 Diag(PrevNS->getLocation(), diag::note_previous_definition); 5337 5338 // Recover by ignoring the new namespace's inline status. 5339 IsInline = PrevNS->isInline(); 5340 } 5341 } 5342 5343 NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, IsInline, 5344 StartLoc, Loc, II, PrevNS); 5345 if (IsInvalid) 5346 Namespc->setInvalidDecl(); 5347 5348 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 5349 5350 // FIXME: Should we be merging attributes? 5351 if (const VisibilityAttr *Attr = Namespc->getAttr<VisibilityAttr>()) 5352 PushNamespaceVisibilityAttr(Attr, Loc); 5353 5354 if (IsStd) 5355 StdNamespace = Namespc; 5356 if (AddToKnown) 5357 KnownNamespaces[Namespc] = false; 5358 5359 if (II) { 5360 PushOnScopeChains(Namespc, DeclRegionScope); 5361 } else { 5362 // Link the anonymous namespace into its parent. 5363 DeclContext *Parent = CurContext->getRedeclContext(); 5364 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 5365 TU->setAnonymousNamespace(Namespc); 5366 } else { 5367 cast<NamespaceDecl>(Parent)->setAnonymousNamespace(Namespc); 5368 } 5369 5370 CurContext->addDecl(Namespc); 5371 5372 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 5373 // behaves as if it were replaced by 5374 // namespace unique { /* empty body */ } 5375 // using namespace unique; 5376 // namespace unique { namespace-body } 5377 // where all occurrences of 'unique' in a translation unit are 5378 // replaced by the same identifier and this identifier differs 5379 // from all other identifiers in the entire program. 5380 5381 // We just create the namespace with an empty name and then add an 5382 // implicit using declaration, just like the standard suggests. 5383 // 5384 // CodeGen enforces the "universally unique" aspect by giving all 5385 // declarations semantically contained within an anonymous 5386 // namespace internal linkage. 5387 5388 if (!PrevNS) { 5389 UsingDirectiveDecl* UD 5390 = UsingDirectiveDecl::Create(Context, CurContext, 5391 /* 'using' */ LBrace, 5392 /* 'namespace' */ SourceLocation(), 5393 /* qualifier */ NestedNameSpecifierLoc(), 5394 /* identifier */ SourceLocation(), 5395 Namespc, 5396 /* Ancestor */ CurContext); 5397 UD->setImplicit(); 5398 CurContext->addDecl(UD); 5399 } 5400 } 5401 5402 // Although we could have an invalid decl (i.e. the namespace name is a 5403 // redefinition), push it as current DeclContext and try to continue parsing. 5404 // FIXME: We should be able to push Namespc here, so that the each DeclContext 5405 // for the namespace has the declarations that showed up in that particular 5406 // namespace definition. 5407 PushDeclContext(NamespcScope, Namespc); 5408 return Namespc; 5409} 5410 5411/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 5412/// is a namespace alias, returns the namespace it points to. 5413static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 5414 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 5415 return AD->getNamespace(); 5416 return dyn_cast_or_null<NamespaceDecl>(D); 5417} 5418 5419/// ActOnFinishNamespaceDef - This callback is called after a namespace is 5420/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 5421void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) { 5422 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 5423 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 5424 Namespc->setRBraceLoc(RBrace); 5425 PopDeclContext(); 5426 if (Namespc->hasAttr<VisibilityAttr>()) 5427 PopPragmaVisibility(true, RBrace); 5428} 5429 5430CXXRecordDecl *Sema::getStdBadAlloc() const { 5431 return cast_or_null<CXXRecordDecl>( 5432 StdBadAlloc.get(Context.getExternalSource())); 5433} 5434 5435NamespaceDecl *Sema::getStdNamespace() const { 5436 return cast_or_null<NamespaceDecl>( 5437 StdNamespace.get(Context.getExternalSource())); 5438} 5439 5440/// \brief Retrieve the special "std" namespace, which may require us to 5441/// implicitly define the namespace. 5442NamespaceDecl *Sema::getOrCreateStdNamespace() { 5443 if (!StdNamespace) { 5444 // The "std" namespace has not yet been defined, so build one implicitly. 5445 StdNamespace = NamespaceDecl::Create(Context, 5446 Context.getTranslationUnitDecl(), 5447 /*Inline=*/false, 5448 SourceLocation(), SourceLocation(), 5449 &PP.getIdentifierTable().get("std"), 5450 /*PrevDecl=*/0); 5451 getStdNamespace()->setImplicit(true); 5452 } 5453 5454 return getStdNamespace(); 5455} 5456 5457bool Sema::isStdInitializerList(QualType Ty, QualType *Element) { 5458 assert(getLangOpts().CPlusPlus && 5459 "Looking for std::initializer_list outside of C++."); 5460 5461 // We're looking for implicit instantiations of 5462 // template <typename E> class std::initializer_list. 5463 5464 if (!StdNamespace) // If we haven't seen namespace std yet, this can't be it. 5465 return false; 5466 5467 ClassTemplateDecl *Template = 0; 5468 const TemplateArgument *Arguments = 0; 5469 5470 if (const RecordType *RT = Ty->getAs<RecordType>()) { 5471 5472 ClassTemplateSpecializationDecl *Specialization = 5473 dyn_cast<ClassTemplateSpecializationDecl>(RT->getDecl()); 5474 if (!Specialization) 5475 return false; 5476 5477 Template = Specialization->getSpecializedTemplate(); 5478 Arguments = Specialization->getTemplateArgs().data(); 5479 } else if (const TemplateSpecializationType *TST = 5480 Ty->getAs<TemplateSpecializationType>()) { 5481 Template = dyn_cast_or_null<ClassTemplateDecl>( 5482 TST->getTemplateName().getAsTemplateDecl()); 5483 Arguments = TST->getArgs(); 5484 } 5485 if (!Template) 5486 return false; 5487 5488 if (!StdInitializerList) { 5489 // Haven't recognized std::initializer_list yet, maybe this is it. 5490 CXXRecordDecl *TemplateClass = Template->getTemplatedDecl(); 5491 if (TemplateClass->getIdentifier() != 5492 &PP.getIdentifierTable().get("initializer_list") || 5493 !getStdNamespace()->InEnclosingNamespaceSetOf( 5494 TemplateClass->getDeclContext())) 5495 return false; 5496 // This is a template called std::initializer_list, but is it the right 5497 // template? 5498 TemplateParameterList *Params = Template->getTemplateParameters(); 5499 if (Params->getMinRequiredArguments() != 1) 5500 return false; 5501 if (!isa<TemplateTypeParmDecl>(Params->getParam(0))) 5502 return false; 5503 5504 // It's the right template. 5505 StdInitializerList = Template; 5506 } 5507 5508 if (Template != StdInitializerList) 5509 return false; 5510 5511 // This is an instance of std::initializer_list. Find the argument type. 5512 if (Element) 5513 *Element = Arguments[0].getAsType(); 5514 return true; 5515} 5516 5517static ClassTemplateDecl *LookupStdInitializerList(Sema &S, SourceLocation Loc){ 5518 NamespaceDecl *Std = S.getStdNamespace(); 5519 if (!Std) { 5520 S.Diag(Loc, diag::err_implied_std_initializer_list_not_found); 5521 return 0; 5522 } 5523 5524 LookupResult Result(S, &S.PP.getIdentifierTable().get("initializer_list"), 5525 Loc, Sema::LookupOrdinaryName); 5526 if (!S.LookupQualifiedName(Result, Std)) { 5527 S.Diag(Loc, diag::err_implied_std_initializer_list_not_found); 5528 return 0; 5529 } 5530 ClassTemplateDecl *Template = Result.getAsSingle<ClassTemplateDecl>(); 5531 if (!Template) { 5532 Result.suppressDiagnostics(); 5533 // We found something weird. Complain about the first thing we found. 5534 NamedDecl *Found = *Result.begin(); 5535 S.Diag(Found->getLocation(), diag::err_malformed_std_initializer_list); 5536 return 0; 5537 } 5538 5539 // We found some template called std::initializer_list. Now verify that it's 5540 // correct. 5541 TemplateParameterList *Params = Template->getTemplateParameters(); 5542 if (Params->getMinRequiredArguments() != 1 || 5543 !isa<TemplateTypeParmDecl>(Params->getParam(0))) { 5544 S.Diag(Template->getLocation(), diag::err_malformed_std_initializer_list); 5545 return 0; 5546 } 5547 5548 return Template; 5549} 5550 5551QualType Sema::BuildStdInitializerList(QualType Element, SourceLocation Loc) { 5552 if (!StdInitializerList) { 5553 StdInitializerList = LookupStdInitializerList(*this, Loc); 5554 if (!StdInitializerList) 5555 return QualType(); 5556 } 5557 5558 TemplateArgumentListInfo Args(Loc, Loc); 5559 Args.addArgument(TemplateArgumentLoc(TemplateArgument(Element), 5560 Context.getTrivialTypeSourceInfo(Element, 5561 Loc))); 5562 return Context.getCanonicalType( 5563 CheckTemplateIdType(TemplateName(StdInitializerList), Loc, Args)); 5564} 5565 5566bool Sema::isInitListConstructor(const CXXConstructorDecl* Ctor) { 5567 // C++ [dcl.init.list]p2: 5568 // A constructor is an initializer-list constructor if its first parameter 5569 // is of type std::initializer_list<E> or reference to possibly cv-qualified 5570 // std::initializer_list<E> for some type E, and either there are no other 5571 // parameters or else all other parameters have default arguments. 5572 if (Ctor->getNumParams() < 1 || 5573 (Ctor->getNumParams() > 1 && !Ctor->getParamDecl(1)->hasDefaultArg())) 5574 return false; 5575 5576 QualType ArgType = Ctor->getParamDecl(0)->getType(); 5577 if (const ReferenceType *RT = ArgType->getAs<ReferenceType>()) 5578 ArgType = RT->getPointeeType().getUnqualifiedType(); 5579 5580 return isStdInitializerList(ArgType, 0); 5581} 5582 5583/// \brief Determine whether a using statement is in a context where it will be 5584/// apply in all contexts. 5585static bool IsUsingDirectiveInToplevelContext(DeclContext *CurContext) { 5586 switch (CurContext->getDeclKind()) { 5587 case Decl::TranslationUnit: 5588 return true; 5589 case Decl::LinkageSpec: 5590 return IsUsingDirectiveInToplevelContext(CurContext->getParent()); 5591 default: 5592 return false; 5593 } 5594} 5595 5596namespace { 5597 5598// Callback to only accept typo corrections that are namespaces. 5599class NamespaceValidatorCCC : public CorrectionCandidateCallback { 5600 public: 5601 virtual bool ValidateCandidate(const TypoCorrection &candidate) { 5602 if (NamedDecl *ND = candidate.getCorrectionDecl()) { 5603 return isa<NamespaceDecl>(ND) || isa<NamespaceAliasDecl>(ND); 5604 } 5605 return false; 5606 } 5607}; 5608 5609} 5610 5611static bool TryNamespaceTypoCorrection(Sema &S, LookupResult &R, Scope *Sc, 5612 CXXScopeSpec &SS, 5613 SourceLocation IdentLoc, 5614 IdentifierInfo *Ident) { 5615 NamespaceValidatorCCC Validator; 5616 R.clear(); 5617 if (TypoCorrection Corrected = S.CorrectTypo(R.getLookupNameInfo(), 5618 R.getLookupKind(), Sc, &SS, 5619 Validator)) { 5620 std::string CorrectedStr(Corrected.getAsString(S.getLangOpts())); 5621 std::string CorrectedQuotedStr(Corrected.getQuoted(S.getLangOpts())); 5622 if (DeclContext *DC = S.computeDeclContext(SS, false)) 5623 S.Diag(IdentLoc, diag::err_using_directive_member_suggest) 5624 << Ident << DC << CorrectedQuotedStr << SS.getRange() 5625 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr); 5626 else 5627 S.Diag(IdentLoc, diag::err_using_directive_suggest) 5628 << Ident << CorrectedQuotedStr 5629 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr); 5630 5631 S.Diag(Corrected.getCorrectionDecl()->getLocation(), 5632 diag::note_namespace_defined_here) << CorrectedQuotedStr; 5633 5634 R.addDecl(Corrected.getCorrectionDecl()); 5635 return true; 5636 } 5637 return false; 5638} 5639 5640Decl *Sema::ActOnUsingDirective(Scope *S, 5641 SourceLocation UsingLoc, 5642 SourceLocation NamespcLoc, 5643 CXXScopeSpec &SS, 5644 SourceLocation IdentLoc, 5645 IdentifierInfo *NamespcName, 5646 AttributeList *AttrList) { 5647 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 5648 assert(NamespcName && "Invalid NamespcName."); 5649 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 5650 5651 // This can only happen along a recovery path. 5652 while (S->getFlags() & Scope::TemplateParamScope) 5653 S = S->getParent(); 5654 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 5655 5656 UsingDirectiveDecl *UDir = 0; 5657 NestedNameSpecifier *Qualifier = 0; 5658 if (SS.isSet()) 5659 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 5660 5661 // Lookup namespace name. 5662 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 5663 LookupParsedName(R, S, &SS); 5664 if (R.isAmbiguous()) 5665 return 0; 5666 5667 if (R.empty()) { 5668 R.clear(); 5669 // Allow "using namespace std;" or "using namespace ::std;" even if 5670 // "std" hasn't been defined yet, for GCC compatibility. 5671 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 5672 NamespcName->isStr("std")) { 5673 Diag(IdentLoc, diag::ext_using_undefined_std); 5674 R.addDecl(getOrCreateStdNamespace()); 5675 R.resolveKind(); 5676 } 5677 // Otherwise, attempt typo correction. 5678 else TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, NamespcName); 5679 } 5680 5681 if (!R.empty()) { 5682 NamedDecl *Named = R.getFoundDecl(); 5683 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 5684 && "expected namespace decl"); 5685 // C++ [namespace.udir]p1: 5686 // A using-directive specifies that the names in the nominated 5687 // namespace can be used in the scope in which the 5688 // using-directive appears after the using-directive. During 5689 // unqualified name lookup (3.4.1), the names appear as if they 5690 // were declared in the nearest enclosing namespace which 5691 // contains both the using-directive and the nominated 5692 // namespace. [Note: in this context, "contains" means "contains 5693 // directly or indirectly". ] 5694 5695 // Find enclosing context containing both using-directive and 5696 // nominated namespace. 5697 NamespaceDecl *NS = getNamespaceDecl(Named); 5698 DeclContext *CommonAncestor = cast<DeclContext>(NS); 5699 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 5700 CommonAncestor = CommonAncestor->getParent(); 5701 5702 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 5703 SS.getWithLocInContext(Context), 5704 IdentLoc, Named, CommonAncestor); 5705 5706 if (IsUsingDirectiveInToplevelContext(CurContext) && 5707 !SourceMgr.isFromMainFile(SourceMgr.getExpansionLoc(IdentLoc))) { 5708 Diag(IdentLoc, diag::warn_using_directive_in_header); 5709 } 5710 5711 PushUsingDirective(S, UDir); 5712 } else { 5713 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 5714 } 5715 5716 // FIXME: We ignore attributes for now. 5717 return UDir; 5718} 5719 5720void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 5721 // If the scope has an associated entity and the using directive is at 5722 // namespace or translation unit scope, add the UsingDirectiveDecl into 5723 // its lookup structure so qualified name lookup can find it. 5724 DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity()); 5725 if (Ctx && !Ctx->isFunctionOrMethod()) 5726 Ctx->addDecl(UDir); 5727 else 5728 // Otherwise, it is at block sope. The using-directives will affect lookup 5729 // only to the end of the scope. 5730 S->PushUsingDirective(UDir); 5731} 5732 5733 5734Decl *Sema::ActOnUsingDeclaration(Scope *S, 5735 AccessSpecifier AS, 5736 bool HasUsingKeyword, 5737 SourceLocation UsingLoc, 5738 CXXScopeSpec &SS, 5739 UnqualifiedId &Name, 5740 AttributeList *AttrList, 5741 bool IsTypeName, 5742 SourceLocation TypenameLoc) { 5743 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 5744 5745 switch (Name.getKind()) { 5746 case UnqualifiedId::IK_ImplicitSelfParam: 5747 case UnqualifiedId::IK_Identifier: 5748 case UnqualifiedId::IK_OperatorFunctionId: 5749 case UnqualifiedId::IK_LiteralOperatorId: 5750 case UnqualifiedId::IK_ConversionFunctionId: 5751 break; 5752 5753 case UnqualifiedId::IK_ConstructorName: 5754 case UnqualifiedId::IK_ConstructorTemplateId: 5755 // C++11 inheriting constructors. 5756 Diag(Name.getLocStart(), 5757 getLangOpts().CPlusPlus0x ? 5758 // FIXME: Produce warn_cxx98_compat_using_decl_constructor 5759 // instead once inheriting constructors work. 5760 diag::err_using_decl_constructor_unsupported : 5761 diag::err_using_decl_constructor) 5762 << SS.getRange(); 5763 5764 if (getLangOpts().CPlusPlus0x) break; 5765 5766 return 0; 5767 5768 case UnqualifiedId::IK_DestructorName: 5769 Diag(Name.getLocStart(), diag::err_using_decl_destructor) 5770 << SS.getRange(); 5771 return 0; 5772 5773 case UnqualifiedId::IK_TemplateId: 5774 Diag(Name.getLocStart(), diag::err_using_decl_template_id) 5775 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 5776 return 0; 5777 } 5778 5779 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name); 5780 DeclarationName TargetName = TargetNameInfo.getName(); 5781 if (!TargetName) 5782 return 0; 5783 5784 // Warn about using declarations. 5785 // TODO: store that the declaration was written without 'using' and 5786 // talk about access decls instead of using decls in the 5787 // diagnostics. 5788 if (!HasUsingKeyword) { 5789 UsingLoc = Name.getLocStart(); 5790 5791 Diag(UsingLoc, diag::warn_access_decl_deprecated) 5792 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 5793 } 5794 5795 if (DiagnoseUnexpandedParameterPack(SS, UPPC_UsingDeclaration) || 5796 DiagnoseUnexpandedParameterPack(TargetNameInfo, UPPC_UsingDeclaration)) 5797 return 0; 5798 5799 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 5800 TargetNameInfo, AttrList, 5801 /* IsInstantiation */ false, 5802 IsTypeName, TypenameLoc); 5803 if (UD) 5804 PushOnScopeChains(UD, S, /*AddToContext*/ false); 5805 5806 return UD; 5807} 5808 5809/// \brief Determine whether a using declaration considers the given 5810/// declarations as "equivalent", e.g., if they are redeclarations of 5811/// the same entity or are both typedefs of the same type. 5812static bool 5813IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2, 5814 bool &SuppressRedeclaration) { 5815 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) { 5816 SuppressRedeclaration = false; 5817 return true; 5818 } 5819 5820 if (TypedefNameDecl *TD1 = dyn_cast<TypedefNameDecl>(D1)) 5821 if (TypedefNameDecl *TD2 = dyn_cast<TypedefNameDecl>(D2)) { 5822 SuppressRedeclaration = true; 5823 return Context.hasSameType(TD1->getUnderlyingType(), 5824 TD2->getUnderlyingType()); 5825 } 5826 5827 return false; 5828} 5829 5830 5831/// Determines whether to create a using shadow decl for a particular 5832/// decl, given the set of decls existing prior to this using lookup. 5833bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 5834 const LookupResult &Previous) { 5835 // Diagnose finding a decl which is not from a base class of the 5836 // current class. We do this now because there are cases where this 5837 // function will silently decide not to build a shadow decl, which 5838 // will pre-empt further diagnostics. 5839 // 5840 // We don't need to do this in C++0x because we do the check once on 5841 // the qualifier. 5842 // 5843 // FIXME: diagnose the following if we care enough: 5844 // struct A { int foo; }; 5845 // struct B : A { using A::foo; }; 5846 // template <class T> struct C : A {}; 5847 // template <class T> struct D : C<T> { using B::foo; } // <--- 5848 // This is invalid (during instantiation) in C++03 because B::foo 5849 // resolves to the using decl in B, which is not a base class of D<T>. 5850 // We can't diagnose it immediately because C<T> is an unknown 5851 // specialization. The UsingShadowDecl in D<T> then points directly 5852 // to A::foo, which will look well-formed when we instantiate. 5853 // The right solution is to not collapse the shadow-decl chain. 5854 if (!getLangOpts().CPlusPlus0x && CurContext->isRecord()) { 5855 DeclContext *OrigDC = Orig->getDeclContext(); 5856 5857 // Handle enums and anonymous structs. 5858 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 5859 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 5860 while (OrigRec->isAnonymousStructOrUnion()) 5861 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 5862 5863 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 5864 if (OrigDC == CurContext) { 5865 Diag(Using->getLocation(), 5866 diag::err_using_decl_nested_name_specifier_is_current_class) 5867 << Using->getQualifierLoc().getSourceRange(); 5868 Diag(Orig->getLocation(), diag::note_using_decl_target); 5869 return true; 5870 } 5871 5872 Diag(Using->getQualifierLoc().getBeginLoc(), 5873 diag::err_using_decl_nested_name_specifier_is_not_base_class) 5874 << Using->getQualifier() 5875 << cast<CXXRecordDecl>(CurContext) 5876 << Using->getQualifierLoc().getSourceRange(); 5877 Diag(Orig->getLocation(), diag::note_using_decl_target); 5878 return true; 5879 } 5880 } 5881 5882 if (Previous.empty()) return false; 5883 5884 NamedDecl *Target = Orig; 5885 if (isa<UsingShadowDecl>(Target)) 5886 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 5887 5888 // If the target happens to be one of the previous declarations, we 5889 // don't have a conflict. 5890 // 5891 // FIXME: but we might be increasing its access, in which case we 5892 // should redeclare it. 5893 NamedDecl *NonTag = 0, *Tag = 0; 5894 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 5895 I != E; ++I) { 5896 NamedDecl *D = (*I)->getUnderlyingDecl(); 5897 bool Result; 5898 if (IsEquivalentForUsingDecl(Context, D, Target, Result)) 5899 return Result; 5900 5901 (isa<TagDecl>(D) ? Tag : NonTag) = D; 5902 } 5903 5904 if (Target->isFunctionOrFunctionTemplate()) { 5905 FunctionDecl *FD; 5906 if (isa<FunctionTemplateDecl>(Target)) 5907 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 5908 else 5909 FD = cast<FunctionDecl>(Target); 5910 5911 NamedDecl *OldDecl = 0; 5912 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 5913 case Ovl_Overload: 5914 return false; 5915 5916 case Ovl_NonFunction: 5917 Diag(Using->getLocation(), diag::err_using_decl_conflict); 5918 break; 5919 5920 // We found a decl with the exact signature. 5921 case Ovl_Match: 5922 // If we're in a record, we want to hide the target, so we 5923 // return true (without a diagnostic) to tell the caller not to 5924 // build a shadow decl. 5925 if (CurContext->isRecord()) 5926 return true; 5927 5928 // If we're not in a record, this is an error. 5929 Diag(Using->getLocation(), diag::err_using_decl_conflict); 5930 break; 5931 } 5932 5933 Diag(Target->getLocation(), diag::note_using_decl_target); 5934 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 5935 return true; 5936 } 5937 5938 // Target is not a function. 5939 5940 if (isa<TagDecl>(Target)) { 5941 // No conflict between a tag and a non-tag. 5942 if (!Tag) return false; 5943 5944 Diag(Using->getLocation(), diag::err_using_decl_conflict); 5945 Diag(Target->getLocation(), diag::note_using_decl_target); 5946 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 5947 return true; 5948 } 5949 5950 // No conflict between a tag and a non-tag. 5951 if (!NonTag) return false; 5952 5953 Diag(Using->getLocation(), diag::err_using_decl_conflict); 5954 Diag(Target->getLocation(), diag::note_using_decl_target); 5955 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 5956 return true; 5957} 5958 5959/// Builds a shadow declaration corresponding to a 'using' declaration. 5960UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 5961 UsingDecl *UD, 5962 NamedDecl *Orig) { 5963 5964 // If we resolved to another shadow declaration, just coalesce them. 5965 NamedDecl *Target = Orig; 5966 if (isa<UsingShadowDecl>(Target)) { 5967 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 5968 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 5969 } 5970 5971 UsingShadowDecl *Shadow 5972 = UsingShadowDecl::Create(Context, CurContext, 5973 UD->getLocation(), UD, Target); 5974 UD->addShadowDecl(Shadow); 5975 5976 Shadow->setAccess(UD->getAccess()); 5977 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 5978 Shadow->setInvalidDecl(); 5979 5980 if (S) 5981 PushOnScopeChains(Shadow, S); 5982 else 5983 CurContext->addDecl(Shadow); 5984 5985 5986 return Shadow; 5987} 5988 5989/// Hides a using shadow declaration. This is required by the current 5990/// using-decl implementation when a resolvable using declaration in a 5991/// class is followed by a declaration which would hide or override 5992/// one or more of the using decl's targets; for example: 5993/// 5994/// struct Base { void foo(int); }; 5995/// struct Derived : Base { 5996/// using Base::foo; 5997/// void foo(int); 5998/// }; 5999/// 6000/// The governing language is C++03 [namespace.udecl]p12: 6001/// 6002/// When a using-declaration brings names from a base class into a 6003/// derived class scope, member functions in the derived class 6004/// override and/or hide member functions with the same name and 6005/// parameter types in a base class (rather than conflicting). 6006/// 6007/// There are two ways to implement this: 6008/// (1) optimistically create shadow decls when they're not hidden 6009/// by existing declarations, or 6010/// (2) don't create any shadow decls (or at least don't make them 6011/// visible) until we've fully parsed/instantiated the class. 6012/// The problem with (1) is that we might have to retroactively remove 6013/// a shadow decl, which requires several O(n) operations because the 6014/// decl structures are (very reasonably) not designed for removal. 6015/// (2) avoids this but is very fiddly and phase-dependent. 6016void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 6017 if (Shadow->getDeclName().getNameKind() == 6018 DeclarationName::CXXConversionFunctionName) 6019 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 6020 6021 // Remove it from the DeclContext... 6022 Shadow->getDeclContext()->removeDecl(Shadow); 6023 6024 // ...and the scope, if applicable... 6025 if (S) { 6026 S->RemoveDecl(Shadow); 6027 IdResolver.RemoveDecl(Shadow); 6028 } 6029 6030 // ...and the using decl. 6031 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 6032 6033 // TODO: complain somehow if Shadow was used. It shouldn't 6034 // be possible for this to happen, because...? 6035} 6036 6037/// Builds a using declaration. 6038/// 6039/// \param IsInstantiation - Whether this call arises from an 6040/// instantiation of an unresolved using declaration. We treat 6041/// the lookup differently for these declarations. 6042NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 6043 SourceLocation UsingLoc, 6044 CXXScopeSpec &SS, 6045 const DeclarationNameInfo &NameInfo, 6046 AttributeList *AttrList, 6047 bool IsInstantiation, 6048 bool IsTypeName, 6049 SourceLocation TypenameLoc) { 6050 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 6051 SourceLocation IdentLoc = NameInfo.getLoc(); 6052 assert(IdentLoc.isValid() && "Invalid TargetName location."); 6053 6054 // FIXME: We ignore attributes for now. 6055 6056 if (SS.isEmpty()) { 6057 Diag(IdentLoc, diag::err_using_requires_qualname); 6058 return 0; 6059 } 6060 6061 // Do the redeclaration lookup in the current scope. 6062 LookupResult Previous(*this, NameInfo, LookupUsingDeclName, 6063 ForRedeclaration); 6064 Previous.setHideTags(false); 6065 if (S) { 6066 LookupName(Previous, S); 6067 6068 // It is really dumb that we have to do this. 6069 LookupResult::Filter F = Previous.makeFilter(); 6070 while (F.hasNext()) { 6071 NamedDecl *D = F.next(); 6072 if (!isDeclInScope(D, CurContext, S)) 6073 F.erase(); 6074 } 6075 F.done(); 6076 } else { 6077 assert(IsInstantiation && "no scope in non-instantiation"); 6078 assert(CurContext->isRecord() && "scope not record in instantiation"); 6079 LookupQualifiedName(Previous, CurContext); 6080 } 6081 6082 // Check for invalid redeclarations. 6083 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 6084 return 0; 6085 6086 // Check for bad qualifiers. 6087 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 6088 return 0; 6089 6090 DeclContext *LookupContext = computeDeclContext(SS); 6091 NamedDecl *D; 6092 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 6093 if (!LookupContext) { 6094 if (IsTypeName) { 6095 // FIXME: not all declaration name kinds are legal here 6096 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 6097 UsingLoc, TypenameLoc, 6098 QualifierLoc, 6099 IdentLoc, NameInfo.getName()); 6100 } else { 6101 D = UnresolvedUsingValueDecl::Create(Context, CurContext, UsingLoc, 6102 QualifierLoc, NameInfo); 6103 } 6104 } else { 6105 D = UsingDecl::Create(Context, CurContext, UsingLoc, QualifierLoc, 6106 NameInfo, IsTypeName); 6107 } 6108 D->setAccess(AS); 6109 CurContext->addDecl(D); 6110 6111 if (!LookupContext) return D; 6112 UsingDecl *UD = cast<UsingDecl>(D); 6113 6114 if (RequireCompleteDeclContext(SS, LookupContext)) { 6115 UD->setInvalidDecl(); 6116 return UD; 6117 } 6118 6119 // The normal rules do not apply to inheriting constructor declarations. 6120 if (NameInfo.getName().getNameKind() == DeclarationName::CXXConstructorName) { 6121 if (CheckInheritingConstructorUsingDecl(UD)) 6122 UD->setInvalidDecl(); 6123 return UD; 6124 } 6125 6126 // Otherwise, look up the target name. 6127 6128 LookupResult R(*this, NameInfo, LookupOrdinaryName); 6129 6130 // Unlike most lookups, we don't always want to hide tag 6131 // declarations: tag names are visible through the using declaration 6132 // even if hidden by ordinary names, *except* in a dependent context 6133 // where it's important for the sanity of two-phase lookup. 6134 if (!IsInstantiation) 6135 R.setHideTags(false); 6136 6137 // For the purposes of this lookup, we have a base object type 6138 // equal to that of the current context. 6139 if (CurContext->isRecord()) { 6140 R.setBaseObjectType( 6141 Context.getTypeDeclType(cast<CXXRecordDecl>(CurContext))); 6142 } 6143 6144 LookupQualifiedName(R, LookupContext); 6145 6146 if (R.empty()) { 6147 Diag(IdentLoc, diag::err_no_member) 6148 << NameInfo.getName() << LookupContext << SS.getRange(); 6149 UD->setInvalidDecl(); 6150 return UD; 6151 } 6152 6153 if (R.isAmbiguous()) { 6154 UD->setInvalidDecl(); 6155 return UD; 6156 } 6157 6158 if (IsTypeName) { 6159 // If we asked for a typename and got a non-type decl, error out. 6160 if (!R.getAsSingle<TypeDecl>()) { 6161 Diag(IdentLoc, diag::err_using_typename_non_type); 6162 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 6163 Diag((*I)->getUnderlyingDecl()->getLocation(), 6164 diag::note_using_decl_target); 6165 UD->setInvalidDecl(); 6166 return UD; 6167 } 6168 } else { 6169 // If we asked for a non-typename and we got a type, error out, 6170 // but only if this is an instantiation of an unresolved using 6171 // decl. Otherwise just silently find the type name. 6172 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 6173 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 6174 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 6175 UD->setInvalidDecl(); 6176 return UD; 6177 } 6178 } 6179 6180 // C++0x N2914 [namespace.udecl]p6: 6181 // A using-declaration shall not name a namespace. 6182 if (R.getAsSingle<NamespaceDecl>()) { 6183 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 6184 << SS.getRange(); 6185 UD->setInvalidDecl(); 6186 return UD; 6187 } 6188 6189 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 6190 if (!CheckUsingShadowDecl(UD, *I, Previous)) 6191 BuildUsingShadowDecl(S, UD, *I); 6192 } 6193 6194 return UD; 6195} 6196 6197/// Additional checks for a using declaration referring to a constructor name. 6198bool Sema::CheckInheritingConstructorUsingDecl(UsingDecl *UD) { 6199 assert(!UD->isTypeName() && "expecting a constructor name"); 6200 6201 const Type *SourceType = UD->getQualifier()->getAsType(); 6202 assert(SourceType && 6203 "Using decl naming constructor doesn't have type in scope spec."); 6204 CXXRecordDecl *TargetClass = cast<CXXRecordDecl>(CurContext); 6205 6206 // Check whether the named type is a direct base class. 6207 CanQualType CanonicalSourceType = SourceType->getCanonicalTypeUnqualified(); 6208 CXXRecordDecl::base_class_iterator BaseIt, BaseE; 6209 for (BaseIt = TargetClass->bases_begin(), BaseE = TargetClass->bases_end(); 6210 BaseIt != BaseE; ++BaseIt) { 6211 CanQualType BaseType = BaseIt->getType()->getCanonicalTypeUnqualified(); 6212 if (CanonicalSourceType == BaseType) 6213 break; 6214 if (BaseIt->getType()->isDependentType()) 6215 break; 6216 } 6217 6218 if (BaseIt == BaseE) { 6219 // Did not find SourceType in the bases. 6220 Diag(UD->getUsingLocation(), 6221 diag::err_using_decl_constructor_not_in_direct_base) 6222 << UD->getNameInfo().getSourceRange() 6223 << QualType(SourceType, 0) << TargetClass; 6224 return true; 6225 } 6226 6227 if (!CurContext->isDependentContext()) 6228 BaseIt->setInheritConstructors(); 6229 6230 return false; 6231} 6232 6233/// Checks that the given using declaration is not an invalid 6234/// redeclaration. Note that this is checking only for the using decl 6235/// itself, not for any ill-formedness among the UsingShadowDecls. 6236bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 6237 bool isTypeName, 6238 const CXXScopeSpec &SS, 6239 SourceLocation NameLoc, 6240 const LookupResult &Prev) { 6241 // C++03 [namespace.udecl]p8: 6242 // C++0x [namespace.udecl]p10: 6243 // A using-declaration is a declaration and can therefore be used 6244 // repeatedly where (and only where) multiple declarations are 6245 // allowed. 6246 // 6247 // That's in non-member contexts. 6248 if (!CurContext->getRedeclContext()->isRecord()) 6249 return false; 6250 6251 NestedNameSpecifier *Qual 6252 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 6253 6254 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 6255 NamedDecl *D = *I; 6256 6257 bool DTypename; 6258 NestedNameSpecifier *DQual; 6259 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 6260 DTypename = UD->isTypeName(); 6261 DQual = UD->getQualifier(); 6262 } else if (UnresolvedUsingValueDecl *UD 6263 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 6264 DTypename = false; 6265 DQual = UD->getQualifier(); 6266 } else if (UnresolvedUsingTypenameDecl *UD 6267 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 6268 DTypename = true; 6269 DQual = UD->getQualifier(); 6270 } else continue; 6271 6272 // using decls differ if one says 'typename' and the other doesn't. 6273 // FIXME: non-dependent using decls? 6274 if (isTypeName != DTypename) continue; 6275 6276 // using decls differ if they name different scopes (but note that 6277 // template instantiation can cause this check to trigger when it 6278 // didn't before instantiation). 6279 if (Context.getCanonicalNestedNameSpecifier(Qual) != 6280 Context.getCanonicalNestedNameSpecifier(DQual)) 6281 continue; 6282 6283 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 6284 Diag(D->getLocation(), diag::note_using_decl) << 1; 6285 return true; 6286 } 6287 6288 return false; 6289} 6290 6291 6292/// Checks that the given nested-name qualifier used in a using decl 6293/// in the current context is appropriately related to the current 6294/// scope. If an error is found, diagnoses it and returns true. 6295bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 6296 const CXXScopeSpec &SS, 6297 SourceLocation NameLoc) { 6298 DeclContext *NamedContext = computeDeclContext(SS); 6299 6300 if (!CurContext->isRecord()) { 6301 // C++03 [namespace.udecl]p3: 6302 // C++0x [namespace.udecl]p8: 6303 // A using-declaration for a class member shall be a member-declaration. 6304 6305 // If we weren't able to compute a valid scope, it must be a 6306 // dependent class scope. 6307 if (!NamedContext || NamedContext->isRecord()) { 6308 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 6309 << SS.getRange(); 6310 return true; 6311 } 6312 6313 // Otherwise, everything is known to be fine. 6314 return false; 6315 } 6316 6317 // The current scope is a record. 6318 6319 // If the named context is dependent, we can't decide much. 6320 if (!NamedContext) { 6321 // FIXME: in C++0x, we can diagnose if we can prove that the 6322 // nested-name-specifier does not refer to a base class, which is 6323 // still possible in some cases. 6324 6325 // Otherwise we have to conservatively report that things might be 6326 // okay. 6327 return false; 6328 } 6329 6330 if (!NamedContext->isRecord()) { 6331 // Ideally this would point at the last name in the specifier, 6332 // but we don't have that level of source info. 6333 Diag(SS.getRange().getBegin(), 6334 diag::err_using_decl_nested_name_specifier_is_not_class) 6335 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 6336 return true; 6337 } 6338 6339 if (!NamedContext->isDependentContext() && 6340 RequireCompleteDeclContext(const_cast<CXXScopeSpec&>(SS), NamedContext)) 6341 return true; 6342 6343 if (getLangOpts().CPlusPlus0x) { 6344 // C++0x [namespace.udecl]p3: 6345 // In a using-declaration used as a member-declaration, the 6346 // nested-name-specifier shall name a base class of the class 6347 // being defined. 6348 6349 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 6350 cast<CXXRecordDecl>(NamedContext))) { 6351 if (CurContext == NamedContext) { 6352 Diag(NameLoc, 6353 diag::err_using_decl_nested_name_specifier_is_current_class) 6354 << SS.getRange(); 6355 return true; 6356 } 6357 6358 Diag(SS.getRange().getBegin(), 6359 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6360 << (NestedNameSpecifier*) SS.getScopeRep() 6361 << cast<CXXRecordDecl>(CurContext) 6362 << SS.getRange(); 6363 return true; 6364 } 6365 6366 return false; 6367 } 6368 6369 // C++03 [namespace.udecl]p4: 6370 // A using-declaration used as a member-declaration shall refer 6371 // to a member of a base class of the class being defined [etc.]. 6372 6373 // Salient point: SS doesn't have to name a base class as long as 6374 // lookup only finds members from base classes. Therefore we can 6375 // diagnose here only if we can prove that that can't happen, 6376 // i.e. if the class hierarchies provably don't intersect. 6377 6378 // TODO: it would be nice if "definitely valid" results were cached 6379 // in the UsingDecl and UsingShadowDecl so that these checks didn't 6380 // need to be repeated. 6381 6382 struct UserData { 6383 llvm::SmallPtrSet<const CXXRecordDecl*, 4> Bases; 6384 6385 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 6386 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 6387 Data->Bases.insert(Base); 6388 return true; 6389 } 6390 6391 bool hasDependentBases(const CXXRecordDecl *Class) { 6392 return !Class->forallBases(collect, this); 6393 } 6394 6395 /// Returns true if the base is dependent or is one of the 6396 /// accumulated base classes. 6397 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 6398 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 6399 return !Data->Bases.count(Base); 6400 } 6401 6402 bool mightShareBases(const CXXRecordDecl *Class) { 6403 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 6404 } 6405 }; 6406 6407 UserData Data; 6408 6409 // Returns false if we find a dependent base. 6410 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 6411 return false; 6412 6413 // Returns false if the class has a dependent base or if it or one 6414 // of its bases is present in the base set of the current context. 6415 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 6416 return false; 6417 6418 Diag(SS.getRange().getBegin(), 6419 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6420 << (NestedNameSpecifier*) SS.getScopeRep() 6421 << cast<CXXRecordDecl>(CurContext) 6422 << SS.getRange(); 6423 6424 return true; 6425} 6426 6427Decl *Sema::ActOnAliasDeclaration(Scope *S, 6428 AccessSpecifier AS, 6429 MultiTemplateParamsArg TemplateParamLists, 6430 SourceLocation UsingLoc, 6431 UnqualifiedId &Name, 6432 TypeResult Type) { 6433 // Skip up to the relevant declaration scope. 6434 while (S->getFlags() & Scope::TemplateParamScope) 6435 S = S->getParent(); 6436 assert((S->getFlags() & Scope::DeclScope) && 6437 "got alias-declaration outside of declaration scope"); 6438 6439 if (Type.isInvalid()) 6440 return 0; 6441 6442 bool Invalid = false; 6443 DeclarationNameInfo NameInfo = GetNameFromUnqualifiedId(Name); 6444 TypeSourceInfo *TInfo = 0; 6445 GetTypeFromParser(Type.get(), &TInfo); 6446 6447 if (DiagnoseClassNameShadow(CurContext, NameInfo)) 6448 return 0; 6449 6450 if (DiagnoseUnexpandedParameterPack(Name.StartLocation, TInfo, 6451 UPPC_DeclarationType)) { 6452 Invalid = true; 6453 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 6454 TInfo->getTypeLoc().getBeginLoc()); 6455 } 6456 6457 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, ForRedeclaration); 6458 LookupName(Previous, S); 6459 6460 // Warn about shadowing the name of a template parameter. 6461 if (Previous.isSingleResult() && 6462 Previous.getFoundDecl()->isTemplateParameter()) { 6463 DiagnoseTemplateParameterShadow(Name.StartLocation,Previous.getFoundDecl()); 6464 Previous.clear(); 6465 } 6466 6467 assert(Name.Kind == UnqualifiedId::IK_Identifier && 6468 "name in alias declaration must be an identifier"); 6469 TypeAliasDecl *NewTD = TypeAliasDecl::Create(Context, CurContext, UsingLoc, 6470 Name.StartLocation, 6471 Name.Identifier, TInfo); 6472 6473 NewTD->setAccess(AS); 6474 6475 if (Invalid) 6476 NewTD->setInvalidDecl(); 6477 6478 CheckTypedefForVariablyModifiedType(S, NewTD); 6479 Invalid |= NewTD->isInvalidDecl(); 6480 6481 bool Redeclaration = false; 6482 6483 NamedDecl *NewND; 6484 if (TemplateParamLists.size()) { 6485 TypeAliasTemplateDecl *OldDecl = 0; 6486 TemplateParameterList *OldTemplateParams = 0; 6487 6488 if (TemplateParamLists.size() != 1) { 6489 Diag(UsingLoc, diag::err_alias_template_extra_headers) 6490 << SourceRange(TemplateParamLists.get()[1]->getTemplateLoc(), 6491 TemplateParamLists.get()[TemplateParamLists.size()-1]->getRAngleLoc()); 6492 } 6493 TemplateParameterList *TemplateParams = TemplateParamLists.get()[0]; 6494 6495 // Only consider previous declarations in the same scope. 6496 FilterLookupForScope(Previous, CurContext, S, /*ConsiderLinkage*/false, 6497 /*ExplicitInstantiationOrSpecialization*/false); 6498 if (!Previous.empty()) { 6499 Redeclaration = true; 6500 6501 OldDecl = Previous.getAsSingle<TypeAliasTemplateDecl>(); 6502 if (!OldDecl && !Invalid) { 6503 Diag(UsingLoc, diag::err_redefinition_different_kind) 6504 << Name.Identifier; 6505 6506 NamedDecl *OldD = Previous.getRepresentativeDecl(); 6507 if (OldD->getLocation().isValid()) 6508 Diag(OldD->getLocation(), diag::note_previous_definition); 6509 6510 Invalid = true; 6511 } 6512 6513 if (!Invalid && OldDecl && !OldDecl->isInvalidDecl()) { 6514 if (TemplateParameterListsAreEqual(TemplateParams, 6515 OldDecl->getTemplateParameters(), 6516 /*Complain=*/true, 6517 TPL_TemplateMatch)) 6518 OldTemplateParams = OldDecl->getTemplateParameters(); 6519 else 6520 Invalid = true; 6521 6522 TypeAliasDecl *OldTD = OldDecl->getTemplatedDecl(); 6523 if (!Invalid && 6524 !Context.hasSameType(OldTD->getUnderlyingType(), 6525 NewTD->getUnderlyingType())) { 6526 // FIXME: The C++0x standard does not clearly say this is ill-formed, 6527 // but we can't reasonably accept it. 6528 Diag(NewTD->getLocation(), diag::err_redefinition_different_typedef) 6529 << 2 << NewTD->getUnderlyingType() << OldTD->getUnderlyingType(); 6530 if (OldTD->getLocation().isValid()) 6531 Diag(OldTD->getLocation(), diag::note_previous_definition); 6532 Invalid = true; 6533 } 6534 } 6535 } 6536 6537 // Merge any previous default template arguments into our parameters, 6538 // and check the parameter list. 6539 if (CheckTemplateParameterList(TemplateParams, OldTemplateParams, 6540 TPC_TypeAliasTemplate)) 6541 return 0; 6542 6543 TypeAliasTemplateDecl *NewDecl = 6544 TypeAliasTemplateDecl::Create(Context, CurContext, UsingLoc, 6545 Name.Identifier, TemplateParams, 6546 NewTD); 6547 6548 NewDecl->setAccess(AS); 6549 6550 if (Invalid) 6551 NewDecl->setInvalidDecl(); 6552 else if (OldDecl) 6553 NewDecl->setPreviousDeclaration(OldDecl); 6554 6555 NewND = NewDecl; 6556 } else { 6557 ActOnTypedefNameDecl(S, CurContext, NewTD, Previous, Redeclaration); 6558 NewND = NewTD; 6559 } 6560 6561 if (!Redeclaration) 6562 PushOnScopeChains(NewND, S); 6563 6564 return NewND; 6565} 6566 6567Decl *Sema::ActOnNamespaceAliasDef(Scope *S, 6568 SourceLocation NamespaceLoc, 6569 SourceLocation AliasLoc, 6570 IdentifierInfo *Alias, 6571 CXXScopeSpec &SS, 6572 SourceLocation IdentLoc, 6573 IdentifierInfo *Ident) { 6574 6575 // Lookup the namespace name. 6576 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 6577 LookupParsedName(R, S, &SS); 6578 6579 // Check if we have a previous declaration with the same name. 6580 NamedDecl *PrevDecl 6581 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 6582 ForRedeclaration); 6583 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 6584 PrevDecl = 0; 6585 6586 if (PrevDecl) { 6587 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 6588 // We already have an alias with the same name that points to the same 6589 // namespace, so don't create a new one. 6590 // FIXME: At some point, we'll want to create the (redundant) 6591 // declaration to maintain better source information. 6592 if (!R.isAmbiguous() && !R.empty() && 6593 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 6594 return 0; 6595 } 6596 6597 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 6598 diag::err_redefinition_different_kind; 6599 Diag(AliasLoc, DiagID) << Alias; 6600 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 6601 return 0; 6602 } 6603 6604 if (R.isAmbiguous()) 6605 return 0; 6606 6607 if (R.empty()) { 6608 if (!TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, Ident)) { 6609 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 6610 return 0; 6611 } 6612 } 6613 6614 NamespaceAliasDecl *AliasDecl = 6615 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 6616 Alias, SS.getWithLocInContext(Context), 6617 IdentLoc, R.getFoundDecl()); 6618 6619 PushOnScopeChains(AliasDecl, S); 6620 return AliasDecl; 6621} 6622 6623namespace { 6624 /// \brief Scoped object used to handle the state changes required in Sema 6625 /// to implicitly define the body of a C++ member function; 6626 class ImplicitlyDefinedFunctionScope { 6627 Sema &S; 6628 Sema::ContextRAII SavedContext; 6629 6630 public: 6631 ImplicitlyDefinedFunctionScope(Sema &S, CXXMethodDecl *Method) 6632 : S(S), SavedContext(S, Method) 6633 { 6634 S.PushFunctionScope(); 6635 S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated); 6636 } 6637 6638 ~ImplicitlyDefinedFunctionScope() { 6639 S.PopExpressionEvaluationContext(); 6640 S.PopFunctionScopeInfo(); 6641 } 6642 }; 6643} 6644 6645Sema::ImplicitExceptionSpecification 6646Sema::ComputeDefaultedDefaultCtorExceptionSpec(CXXRecordDecl *ClassDecl) { 6647 // C++ [except.spec]p14: 6648 // An implicitly declared special member function (Clause 12) shall have an 6649 // exception-specification. [...] 6650 ImplicitExceptionSpecification ExceptSpec(*this); 6651 if (ClassDecl->isInvalidDecl()) 6652 return ExceptSpec; 6653 6654 // Direct base-class constructors. 6655 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 6656 BEnd = ClassDecl->bases_end(); 6657 B != BEnd; ++B) { 6658 if (B->isVirtual()) // Handled below. 6659 continue; 6660 6661 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 6662 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 6663 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 6664 // If this is a deleted function, add it anyway. This might be conformant 6665 // with the standard. This might not. I'm not sure. It might not matter. 6666 if (Constructor) 6667 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 6668 } 6669 } 6670 6671 // Virtual base-class constructors. 6672 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 6673 BEnd = ClassDecl->vbases_end(); 6674 B != BEnd; ++B) { 6675 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 6676 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 6677 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 6678 // If this is a deleted function, add it anyway. This might be conformant 6679 // with the standard. This might not. I'm not sure. It might not matter. 6680 if (Constructor) 6681 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 6682 } 6683 } 6684 6685 // Field constructors. 6686 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 6687 FEnd = ClassDecl->field_end(); 6688 F != FEnd; ++F) { 6689 if (F->hasInClassInitializer()) { 6690 if (Expr *E = F->getInClassInitializer()) 6691 ExceptSpec.CalledExpr(E); 6692 else if (!F->isInvalidDecl()) 6693 ExceptSpec.SetDelayed(); 6694 } else if (const RecordType *RecordTy 6695 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 6696 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 6697 CXXConstructorDecl *Constructor = LookupDefaultConstructor(FieldRecDecl); 6698 // If this is a deleted function, add it anyway. This might be conformant 6699 // with the standard. This might not. I'm not sure. It might not matter. 6700 // In particular, the problem is that this function never gets called. It 6701 // might just be ill-formed because this function attempts to refer to 6702 // a deleted function here. 6703 if (Constructor) 6704 ExceptSpec.CalledDecl(F->getLocation(), Constructor); 6705 } 6706 } 6707 6708 return ExceptSpec; 6709} 6710 6711CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( 6712 CXXRecordDecl *ClassDecl) { 6713 // C++ [class.ctor]p5: 6714 // A default constructor for a class X is a constructor of class X 6715 // that can be called without an argument. If there is no 6716 // user-declared constructor for class X, a default constructor is 6717 // implicitly declared. An implicitly-declared default constructor 6718 // is an inline public member of its class. 6719 assert(!ClassDecl->hasUserDeclaredConstructor() && 6720 "Should not build implicit default constructor!"); 6721 6722 ImplicitExceptionSpecification Spec = 6723 ComputeDefaultedDefaultCtorExceptionSpec(ClassDecl); 6724 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 6725 6726 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, 6727 CXXDefaultConstructor, 6728 false); 6729 6730 // Create the actual constructor declaration. 6731 CanQualType ClassType 6732 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 6733 SourceLocation ClassLoc = ClassDecl->getLocation(); 6734 DeclarationName Name 6735 = Context.DeclarationNames.getCXXConstructorName(ClassType); 6736 DeclarationNameInfo NameInfo(Name, ClassLoc); 6737 CXXConstructorDecl *DefaultCon = CXXConstructorDecl::Create( 6738 Context, ClassDecl, ClassLoc, NameInfo, 6739 Context.getFunctionType(Context.VoidTy, 0, 0, EPI), /*TInfo=*/0, 6740 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 6741 Constexpr); 6742 DefaultCon->setAccess(AS_public); 6743 DefaultCon->setDefaulted(); 6744 DefaultCon->setImplicit(); 6745 DefaultCon->setTrivial(ClassDecl->hasTrivialDefaultConstructor()); 6746 6747 // Note that we have declared this constructor. 6748 ++ASTContext::NumImplicitDefaultConstructorsDeclared; 6749 6750 if (Scope *S = getScopeForContext(ClassDecl)) 6751 PushOnScopeChains(DefaultCon, S, false); 6752 ClassDecl->addDecl(DefaultCon); 6753 6754 if (ShouldDeleteSpecialMember(DefaultCon, CXXDefaultConstructor)) 6755 DefaultCon->setDeletedAsWritten(); 6756 6757 return DefaultCon; 6758} 6759 6760void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 6761 CXXConstructorDecl *Constructor) { 6762 assert((Constructor->isDefaulted() && Constructor->isDefaultConstructor() && 6763 !Constructor->doesThisDeclarationHaveABody() && 6764 !Constructor->isDeleted()) && 6765 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 6766 6767 CXXRecordDecl *ClassDecl = Constructor->getParent(); 6768 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 6769 6770 ImplicitlyDefinedFunctionScope Scope(*this, Constructor); 6771 DiagnosticErrorTrap Trap(Diags); 6772 if (SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false) || 6773 Trap.hasErrorOccurred()) { 6774 Diag(CurrentLocation, diag::note_member_synthesized_at) 6775 << CXXDefaultConstructor << Context.getTagDeclType(ClassDecl); 6776 Constructor->setInvalidDecl(); 6777 return; 6778 } 6779 6780 SourceLocation Loc = Constructor->getLocation(); 6781 Constructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 6782 6783 Constructor->setUsed(); 6784 MarkVTableUsed(CurrentLocation, ClassDecl); 6785 6786 if (ASTMutationListener *L = getASTMutationListener()) { 6787 L->CompletedImplicitDefinition(Constructor); 6788 } 6789} 6790 6791/// Get any existing defaulted default constructor for the given class. Do not 6792/// implicitly define one if it does not exist. 6793static CXXConstructorDecl *getDefaultedDefaultConstructorUnsafe(Sema &Self, 6794 CXXRecordDecl *D) { 6795 ASTContext &Context = Self.Context; 6796 QualType ClassType = Context.getTypeDeclType(D); 6797 DeclarationName ConstructorName 6798 = Context.DeclarationNames.getCXXConstructorName( 6799 Context.getCanonicalType(ClassType.getUnqualifiedType())); 6800 6801 DeclContext::lookup_const_iterator Con, ConEnd; 6802 for (llvm::tie(Con, ConEnd) = D->lookup(ConstructorName); 6803 Con != ConEnd; ++Con) { 6804 // A function template cannot be defaulted. 6805 if (isa<FunctionTemplateDecl>(*Con)) 6806 continue; 6807 6808 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 6809 if (Constructor->isDefaultConstructor()) 6810 return Constructor->isDefaulted() ? Constructor : 0; 6811 } 6812 return 0; 6813} 6814 6815void Sema::ActOnFinishDelayedMemberInitializers(Decl *D) { 6816 if (!D) return; 6817 AdjustDeclIfTemplate(D); 6818 6819 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(D); 6820 CXXConstructorDecl *CtorDecl 6821 = getDefaultedDefaultConstructorUnsafe(*this, ClassDecl); 6822 6823 if (!CtorDecl) return; 6824 6825 // Compute the exception specification for the default constructor. 6826 const FunctionProtoType *CtorTy = 6827 CtorDecl->getType()->castAs<FunctionProtoType>(); 6828 if (CtorTy->getExceptionSpecType() == EST_Delayed) { 6829 // FIXME: Don't do this unless the exception spec is needed. 6830 ImplicitExceptionSpecification Spec = 6831 ComputeDefaultedDefaultCtorExceptionSpec(ClassDecl); 6832 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 6833 assert(EPI.ExceptionSpecType != EST_Delayed); 6834 6835 CtorDecl->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 6836 } 6837 6838 // If the default constructor is explicitly defaulted, checking the exception 6839 // specification is deferred until now. 6840 if (!CtorDecl->isInvalidDecl() && CtorDecl->isExplicitlyDefaulted() && 6841 !ClassDecl->isDependentType()) 6842 CheckExplicitlyDefaultedSpecialMember(CtorDecl); 6843} 6844 6845void Sema::DeclareInheritedConstructors(CXXRecordDecl *ClassDecl) { 6846 // We start with an initial pass over the base classes to collect those that 6847 // inherit constructors from. If there are none, we can forgo all further 6848 // processing. 6849 typedef SmallVector<const RecordType *, 4> BasesVector; 6850 BasesVector BasesToInheritFrom; 6851 for (CXXRecordDecl::base_class_iterator BaseIt = ClassDecl->bases_begin(), 6852 BaseE = ClassDecl->bases_end(); 6853 BaseIt != BaseE; ++BaseIt) { 6854 if (BaseIt->getInheritConstructors()) { 6855 QualType Base = BaseIt->getType(); 6856 if (Base->isDependentType()) { 6857 // If we inherit constructors from anything that is dependent, just 6858 // abort processing altogether. We'll get another chance for the 6859 // instantiations. 6860 return; 6861 } 6862 BasesToInheritFrom.push_back(Base->castAs<RecordType>()); 6863 } 6864 } 6865 if (BasesToInheritFrom.empty()) 6866 return; 6867 6868 // Now collect the constructors that we already have in the current class. 6869 // Those take precedence over inherited constructors. 6870 // C++0x [class.inhctor]p3: [...] a constructor is implicitly declared [...] 6871 // unless there is a user-declared constructor with the same signature in 6872 // the class where the using-declaration appears. 6873 llvm::SmallSet<const Type *, 8> ExistingConstructors; 6874 for (CXXRecordDecl::ctor_iterator CtorIt = ClassDecl->ctor_begin(), 6875 CtorE = ClassDecl->ctor_end(); 6876 CtorIt != CtorE; ++CtorIt) { 6877 ExistingConstructors.insert( 6878 Context.getCanonicalType(CtorIt->getType()).getTypePtr()); 6879 } 6880 6881 DeclarationName CreatedCtorName = 6882 Context.DeclarationNames.getCXXConstructorName( 6883 ClassDecl->getTypeForDecl()->getCanonicalTypeUnqualified()); 6884 6885 // Now comes the true work. 6886 // First, we keep a map from constructor types to the base that introduced 6887 // them. Needed for finding conflicting constructors. We also keep the 6888 // actually inserted declarations in there, for pretty diagnostics. 6889 typedef std::pair<CanQualType, CXXConstructorDecl *> ConstructorInfo; 6890 typedef llvm::DenseMap<const Type *, ConstructorInfo> ConstructorToSourceMap; 6891 ConstructorToSourceMap InheritedConstructors; 6892 for (BasesVector::iterator BaseIt = BasesToInheritFrom.begin(), 6893 BaseE = BasesToInheritFrom.end(); 6894 BaseIt != BaseE; ++BaseIt) { 6895 const RecordType *Base = *BaseIt; 6896 CanQualType CanonicalBase = Base->getCanonicalTypeUnqualified(); 6897 CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(Base->getDecl()); 6898 for (CXXRecordDecl::ctor_iterator CtorIt = BaseDecl->ctor_begin(), 6899 CtorE = BaseDecl->ctor_end(); 6900 CtorIt != CtorE; ++CtorIt) { 6901 // Find the using declaration for inheriting this base's constructors. 6902 // FIXME: Don't perform name lookup just to obtain a source location! 6903 DeclarationName Name = 6904 Context.DeclarationNames.getCXXConstructorName(CanonicalBase); 6905 LookupResult Result(*this, Name, SourceLocation(), LookupUsingDeclName); 6906 LookupQualifiedName(Result, CurContext); 6907 UsingDecl *UD = Result.getAsSingle<UsingDecl>(); 6908 SourceLocation UsingLoc = UD ? UD->getLocation() : 6909 ClassDecl->getLocation(); 6910 6911 // C++0x [class.inhctor]p1: The candidate set of inherited constructors 6912 // from the class X named in the using-declaration consists of actual 6913 // constructors and notional constructors that result from the 6914 // transformation of defaulted parameters as follows: 6915 // - all non-template default constructors of X, and 6916 // - for each non-template constructor of X that has at least one 6917 // parameter with a default argument, the set of constructors that 6918 // results from omitting any ellipsis parameter specification and 6919 // successively omitting parameters with a default argument from the 6920 // end of the parameter-type-list. 6921 CXXConstructorDecl *BaseCtor = *CtorIt; 6922 bool CanBeCopyOrMove = BaseCtor->isCopyOrMoveConstructor(); 6923 const FunctionProtoType *BaseCtorType = 6924 BaseCtor->getType()->getAs<FunctionProtoType>(); 6925 6926 for (unsigned params = BaseCtor->getMinRequiredArguments(), 6927 maxParams = BaseCtor->getNumParams(); 6928 params <= maxParams; ++params) { 6929 // Skip default constructors. They're never inherited. 6930 if (params == 0) 6931 continue; 6932 // Skip copy and move constructors for the same reason. 6933 if (CanBeCopyOrMove && params == 1) 6934 continue; 6935 6936 // Build up a function type for this particular constructor. 6937 // FIXME: The working paper does not consider that the exception spec 6938 // for the inheriting constructor might be larger than that of the 6939 // source. This code doesn't yet, either. When it does, this code will 6940 // need to be delayed until after exception specifications and in-class 6941 // member initializers are attached. 6942 const Type *NewCtorType; 6943 if (params == maxParams) 6944 NewCtorType = BaseCtorType; 6945 else { 6946 SmallVector<QualType, 16> Args; 6947 for (unsigned i = 0; i < params; ++i) { 6948 Args.push_back(BaseCtorType->getArgType(i)); 6949 } 6950 FunctionProtoType::ExtProtoInfo ExtInfo = 6951 BaseCtorType->getExtProtoInfo(); 6952 ExtInfo.Variadic = false; 6953 NewCtorType = Context.getFunctionType(BaseCtorType->getResultType(), 6954 Args.data(), params, ExtInfo) 6955 .getTypePtr(); 6956 } 6957 const Type *CanonicalNewCtorType = 6958 Context.getCanonicalType(NewCtorType); 6959 6960 // Now that we have the type, first check if the class already has a 6961 // constructor with this signature. 6962 if (ExistingConstructors.count(CanonicalNewCtorType)) 6963 continue; 6964 6965 // Then we check if we have already declared an inherited constructor 6966 // with this signature. 6967 std::pair<ConstructorToSourceMap::iterator, bool> result = 6968 InheritedConstructors.insert(std::make_pair( 6969 CanonicalNewCtorType, 6970 std::make_pair(CanonicalBase, (CXXConstructorDecl*)0))); 6971 if (!result.second) { 6972 // Already in the map. If it came from a different class, that's an 6973 // error. Not if it's from the same. 6974 CanQualType PreviousBase = result.first->second.first; 6975 if (CanonicalBase != PreviousBase) { 6976 const CXXConstructorDecl *PrevCtor = result.first->second.second; 6977 const CXXConstructorDecl *PrevBaseCtor = 6978 PrevCtor->getInheritedConstructor(); 6979 assert(PrevBaseCtor && "Conflicting constructor was not inherited"); 6980 6981 Diag(UsingLoc, diag::err_using_decl_constructor_conflict); 6982 Diag(BaseCtor->getLocation(), 6983 diag::note_using_decl_constructor_conflict_current_ctor); 6984 Diag(PrevBaseCtor->getLocation(), 6985 diag::note_using_decl_constructor_conflict_previous_ctor); 6986 Diag(PrevCtor->getLocation(), 6987 diag::note_using_decl_constructor_conflict_previous_using); 6988 } 6989 continue; 6990 } 6991 6992 // OK, we're there, now add the constructor. 6993 // C++0x [class.inhctor]p8: [...] that would be performed by a 6994 // user-written inline constructor [...] 6995 DeclarationNameInfo DNI(CreatedCtorName, UsingLoc); 6996 CXXConstructorDecl *NewCtor = CXXConstructorDecl::Create( 6997 Context, ClassDecl, UsingLoc, DNI, QualType(NewCtorType, 0), 6998 /*TInfo=*/0, BaseCtor->isExplicit(), /*Inline=*/true, 6999 /*ImplicitlyDeclared=*/true, 7000 // FIXME: Due to a defect in the standard, we treat inherited 7001 // constructors as constexpr even if that makes them ill-formed. 7002 /*Constexpr=*/BaseCtor->isConstexpr()); 7003 NewCtor->setAccess(BaseCtor->getAccess()); 7004 7005 // Build up the parameter decls and add them. 7006 SmallVector<ParmVarDecl *, 16> ParamDecls; 7007 for (unsigned i = 0; i < params; ++i) { 7008 ParamDecls.push_back(ParmVarDecl::Create(Context, NewCtor, 7009 UsingLoc, UsingLoc, 7010 /*IdentifierInfo=*/0, 7011 BaseCtorType->getArgType(i), 7012 /*TInfo=*/0, SC_None, 7013 SC_None, /*DefaultArg=*/0)); 7014 } 7015 NewCtor->setParams(ParamDecls); 7016 NewCtor->setInheritedConstructor(BaseCtor); 7017 7018 ClassDecl->addDecl(NewCtor); 7019 result.first->second.second = NewCtor; 7020 } 7021 } 7022 } 7023} 7024 7025Sema::ImplicitExceptionSpecification 7026Sema::ComputeDefaultedDtorExceptionSpec(CXXRecordDecl *ClassDecl) { 7027 // C++ [except.spec]p14: 7028 // An implicitly declared special member function (Clause 12) shall have 7029 // an exception-specification. 7030 ImplicitExceptionSpecification ExceptSpec(*this); 7031 if (ClassDecl->isInvalidDecl()) 7032 return ExceptSpec; 7033 7034 // Direct base-class destructors. 7035 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 7036 BEnd = ClassDecl->bases_end(); 7037 B != BEnd; ++B) { 7038 if (B->isVirtual()) // Handled below. 7039 continue; 7040 7041 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 7042 ExceptSpec.CalledDecl(B->getLocStart(), 7043 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 7044 } 7045 7046 // Virtual base-class destructors. 7047 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 7048 BEnd = ClassDecl->vbases_end(); 7049 B != BEnd; ++B) { 7050 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 7051 ExceptSpec.CalledDecl(B->getLocStart(), 7052 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 7053 } 7054 7055 // Field destructors. 7056 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 7057 FEnd = ClassDecl->field_end(); 7058 F != FEnd; ++F) { 7059 if (const RecordType *RecordTy 7060 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 7061 ExceptSpec.CalledDecl(F->getLocation(), 7062 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl()))); 7063 } 7064 7065 return ExceptSpec; 7066} 7067 7068CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { 7069 // C++ [class.dtor]p2: 7070 // If a class has no user-declared destructor, a destructor is 7071 // declared implicitly. An implicitly-declared destructor is an 7072 // inline public member of its class. 7073 7074 ImplicitExceptionSpecification Spec = 7075 ComputeDefaultedDtorExceptionSpec(ClassDecl); 7076 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 7077 7078 // Create the actual destructor declaration. 7079 QualType Ty = Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 7080 7081 CanQualType ClassType 7082 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 7083 SourceLocation ClassLoc = ClassDecl->getLocation(); 7084 DeclarationName Name 7085 = Context.DeclarationNames.getCXXDestructorName(ClassType); 7086 DeclarationNameInfo NameInfo(Name, ClassLoc); 7087 CXXDestructorDecl *Destructor 7088 = CXXDestructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, Ty, 0, 7089 /*isInline=*/true, 7090 /*isImplicitlyDeclared=*/true); 7091 Destructor->setAccess(AS_public); 7092 Destructor->setDefaulted(); 7093 Destructor->setImplicit(); 7094 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 7095 7096 // Note that we have declared this destructor. 7097 ++ASTContext::NumImplicitDestructorsDeclared; 7098 7099 // Introduce this destructor into its scope. 7100 if (Scope *S = getScopeForContext(ClassDecl)) 7101 PushOnScopeChains(Destructor, S, false); 7102 ClassDecl->addDecl(Destructor); 7103 7104 // This could be uniqued if it ever proves significant. 7105 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 7106 7107 AddOverriddenMethods(ClassDecl, Destructor); 7108 7109 if (ShouldDeleteSpecialMember(Destructor, CXXDestructor)) 7110 Destructor->setDeletedAsWritten(); 7111 7112 return Destructor; 7113} 7114 7115void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 7116 CXXDestructorDecl *Destructor) { 7117 assert((Destructor->isDefaulted() && 7118 !Destructor->doesThisDeclarationHaveABody() && 7119 !Destructor->isDeleted()) && 7120 "DefineImplicitDestructor - call it for implicit default dtor"); 7121 CXXRecordDecl *ClassDecl = Destructor->getParent(); 7122 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 7123 7124 if (Destructor->isInvalidDecl()) 7125 return; 7126 7127 ImplicitlyDefinedFunctionScope Scope(*this, Destructor); 7128 7129 DiagnosticErrorTrap Trap(Diags); 7130 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 7131 Destructor->getParent()); 7132 7133 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 7134 Diag(CurrentLocation, diag::note_member_synthesized_at) 7135 << CXXDestructor << Context.getTagDeclType(ClassDecl); 7136 7137 Destructor->setInvalidDecl(); 7138 return; 7139 } 7140 7141 SourceLocation Loc = Destructor->getLocation(); 7142 Destructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 7143 Destructor->setImplicitlyDefined(true); 7144 Destructor->setUsed(); 7145 MarkVTableUsed(CurrentLocation, ClassDecl); 7146 7147 if (ASTMutationListener *L = getASTMutationListener()) { 7148 L->CompletedImplicitDefinition(Destructor); 7149 } 7150} 7151 7152/// \brief Perform any semantic analysis which needs to be delayed until all 7153/// pending class member declarations have been parsed. 7154void Sema::ActOnFinishCXXMemberDecls() { 7155 // Now we have parsed all exception specifications, determine the implicit 7156 // exception specifications for destructors. 7157 for (unsigned i = 0, e = DelayedDestructorExceptionSpecs.size(); 7158 i != e; ++i) { 7159 CXXDestructorDecl *Dtor = DelayedDestructorExceptionSpecs[i]; 7160 AdjustDestructorExceptionSpec(Dtor->getParent(), Dtor, true); 7161 } 7162 DelayedDestructorExceptionSpecs.clear(); 7163 7164 // Perform any deferred checking of exception specifications for virtual 7165 // destructors. 7166 for (unsigned i = 0, e = DelayedDestructorExceptionSpecChecks.size(); 7167 i != e; ++i) { 7168 const CXXDestructorDecl *Dtor = 7169 DelayedDestructorExceptionSpecChecks[i].first; 7170 assert(!Dtor->getParent()->isDependentType() && 7171 "Should not ever add destructors of templates into the list."); 7172 CheckOverridingFunctionExceptionSpec(Dtor, 7173 DelayedDestructorExceptionSpecChecks[i].second); 7174 } 7175 DelayedDestructorExceptionSpecChecks.clear(); 7176} 7177 7178void Sema::AdjustDestructorExceptionSpec(CXXRecordDecl *classDecl, 7179 CXXDestructorDecl *destructor, 7180 bool WasDelayed) { 7181 // C++11 [class.dtor]p3: 7182 // A declaration of a destructor that does not have an exception- 7183 // specification is implicitly considered to have the same exception- 7184 // specification as an implicit declaration. 7185 const FunctionProtoType *dtorType = destructor->getType()-> 7186 getAs<FunctionProtoType>(); 7187 if (!WasDelayed && dtorType->hasExceptionSpec()) 7188 return; 7189 7190 ImplicitExceptionSpecification exceptSpec = 7191 ComputeDefaultedDtorExceptionSpec(classDecl); 7192 7193 // Replace the destructor's type, building off the existing one. Fortunately, 7194 // the only thing of interest in the destructor type is its extended info. 7195 // The return and arguments are fixed. 7196 FunctionProtoType::ExtProtoInfo epi = dtorType->getExtProtoInfo(); 7197 epi.ExceptionSpecType = exceptSpec.getExceptionSpecType(); 7198 epi.NumExceptions = exceptSpec.size(); 7199 epi.Exceptions = exceptSpec.data(); 7200 QualType ty = Context.getFunctionType(Context.VoidTy, 0, 0, epi); 7201 7202 destructor->setType(ty); 7203 7204 // If we can't compute the exception specification for this destructor yet 7205 // (because it depends on an exception specification which we have not parsed 7206 // yet), make a note that we need to try again when the class is complete. 7207 if (epi.ExceptionSpecType == EST_Delayed) { 7208 assert(!WasDelayed && "couldn't compute destructor exception spec"); 7209 DelayedDestructorExceptionSpecs.push_back(destructor); 7210 } 7211 7212 // FIXME: If the destructor has a body that could throw, and the newly created 7213 // spec doesn't allow exceptions, we should emit a warning, because this 7214 // change in behavior can break conforming C++03 programs at runtime. 7215 // However, we don't have a body yet, so it needs to be done somewhere else. 7216} 7217 7218/// \brief Builds a statement that copies/moves the given entity from \p From to 7219/// \c To. 7220/// 7221/// This routine is used to copy/move the members of a class with an 7222/// implicitly-declared copy/move assignment operator. When the entities being 7223/// copied are arrays, this routine builds for loops to copy them. 7224/// 7225/// \param S The Sema object used for type-checking. 7226/// 7227/// \param Loc The location where the implicit copy/move is being generated. 7228/// 7229/// \param T The type of the expressions being copied/moved. Both expressions 7230/// must have this type. 7231/// 7232/// \param To The expression we are copying/moving to. 7233/// 7234/// \param From The expression we are copying/moving from. 7235/// 7236/// \param CopyingBaseSubobject Whether we're copying/moving a base subobject. 7237/// Otherwise, it's a non-static member subobject. 7238/// 7239/// \param Copying Whether we're copying or moving. 7240/// 7241/// \param Depth Internal parameter recording the depth of the recursion. 7242/// 7243/// \returns A statement or a loop that copies the expressions. 7244static StmtResult 7245BuildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 7246 Expr *To, Expr *From, 7247 bool CopyingBaseSubobject, bool Copying, 7248 unsigned Depth = 0) { 7249 // C++0x [class.copy]p28: 7250 // Each subobject is assigned in the manner appropriate to its type: 7251 // 7252 // - if the subobject is of class type, as if by a call to operator= with 7253 // the subobject as the object expression and the corresponding 7254 // subobject of x as a single function argument (as if by explicit 7255 // qualification; that is, ignoring any possible virtual overriding 7256 // functions in more derived classes); 7257 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 7258 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 7259 7260 // Look for operator=. 7261 DeclarationName Name 7262 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 7263 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 7264 S.LookupQualifiedName(OpLookup, ClassDecl, false); 7265 7266 // Filter out any result that isn't a copy/move-assignment operator. 7267 LookupResult::Filter F = OpLookup.makeFilter(); 7268 while (F.hasNext()) { 7269 NamedDecl *D = F.next(); 7270 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 7271 if (Method->isCopyAssignmentOperator() || 7272 (!Copying && Method->isMoveAssignmentOperator())) 7273 continue; 7274 7275 F.erase(); 7276 } 7277 F.done(); 7278 7279 // Suppress the protected check (C++ [class.protected]) for each of the 7280 // assignment operators we found. This strange dance is required when 7281 // we're assigning via a base classes's copy-assignment operator. To 7282 // ensure that we're getting the right base class subobject (without 7283 // ambiguities), we need to cast "this" to that subobject type; to 7284 // ensure that we don't go through the virtual call mechanism, we need 7285 // to qualify the operator= name with the base class (see below). However, 7286 // this means that if the base class has a protected copy assignment 7287 // operator, the protected member access check will fail. So, we 7288 // rewrite "protected" access to "public" access in this case, since we 7289 // know by construction that we're calling from a derived class. 7290 if (CopyingBaseSubobject) { 7291 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 7292 L != LEnd; ++L) { 7293 if (L.getAccess() == AS_protected) 7294 L.setAccess(AS_public); 7295 } 7296 } 7297 7298 // Create the nested-name-specifier that will be used to qualify the 7299 // reference to operator=; this is required to suppress the virtual 7300 // call mechanism. 7301 CXXScopeSpec SS; 7302 const Type *CanonicalT = S.Context.getCanonicalType(T.getTypePtr()); 7303 SS.MakeTrivial(S.Context, 7304 NestedNameSpecifier::Create(S.Context, 0, false, 7305 CanonicalT), 7306 Loc); 7307 7308 // Create the reference to operator=. 7309 ExprResult OpEqualRef 7310 = S.BuildMemberReferenceExpr(To, T, Loc, /*isArrow=*/false, SS, 7311 /*TemplateKWLoc=*/SourceLocation(), 7312 /*FirstQualifierInScope=*/0, 7313 OpLookup, 7314 /*TemplateArgs=*/0, 7315 /*SuppressQualifierCheck=*/true); 7316 if (OpEqualRef.isInvalid()) 7317 return StmtError(); 7318 7319 // Build the call to the assignment operator. 7320 7321 ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 7322 OpEqualRef.takeAs<Expr>(), 7323 Loc, &From, 1, Loc); 7324 if (Call.isInvalid()) 7325 return StmtError(); 7326 7327 return S.Owned(Call.takeAs<Stmt>()); 7328 } 7329 7330 // - if the subobject is of scalar type, the built-in assignment 7331 // operator is used. 7332 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 7333 if (!ArrayTy) { 7334 ExprResult Assignment = S.CreateBuiltinBinOp(Loc, BO_Assign, To, From); 7335 if (Assignment.isInvalid()) 7336 return StmtError(); 7337 7338 return S.Owned(Assignment.takeAs<Stmt>()); 7339 } 7340 7341 // - if the subobject is an array, each element is assigned, in the 7342 // manner appropriate to the element type; 7343 7344 // Construct a loop over the array bounds, e.g., 7345 // 7346 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 7347 // 7348 // that will copy each of the array elements. 7349 QualType SizeType = S.Context.getSizeType(); 7350 7351 // Create the iteration variable. 7352 IdentifierInfo *IterationVarName = 0; 7353 { 7354 SmallString<8> Str; 7355 llvm::raw_svector_ostream OS(Str); 7356 OS << "__i" << Depth; 7357 IterationVarName = &S.Context.Idents.get(OS.str()); 7358 } 7359 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, Loc, 7360 IterationVarName, SizeType, 7361 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 7362 SC_None, SC_None); 7363 7364 // Initialize the iteration variable to zero. 7365 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 7366 IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc)); 7367 7368 // Create a reference to the iteration variable; we'll use this several 7369 // times throughout. 7370 Expr *IterationVarRef 7371 = S.BuildDeclRefExpr(IterationVar, SizeType, VK_LValue, Loc).take(); 7372 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 7373 Expr *IterationVarRefRVal = S.DefaultLvalueConversion(IterationVarRef).take(); 7374 assert(IterationVarRefRVal && "Conversion of invented variable cannot fail!"); 7375 7376 // Create the DeclStmt that holds the iteration variable. 7377 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 7378 7379 // Create the comparison against the array bound. 7380 llvm::APInt Upper 7381 = ArrayTy->getSize().zextOrTrunc(S.Context.getTypeSize(SizeType)); 7382 Expr *Comparison 7383 = new (S.Context) BinaryOperator(IterationVarRefRVal, 7384 IntegerLiteral::Create(S.Context, Upper, SizeType, Loc), 7385 BO_NE, S.Context.BoolTy, 7386 VK_RValue, OK_Ordinary, Loc); 7387 7388 // Create the pre-increment of the iteration variable. 7389 Expr *Increment 7390 = new (S.Context) UnaryOperator(IterationVarRef, UO_PreInc, SizeType, 7391 VK_LValue, OK_Ordinary, Loc); 7392 7393 // Subscript the "from" and "to" expressions with the iteration variable. 7394 From = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(From, Loc, 7395 IterationVarRefRVal, 7396 Loc)); 7397 To = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(To, Loc, 7398 IterationVarRefRVal, 7399 Loc)); 7400 if (!Copying) // Cast to rvalue 7401 From = CastForMoving(S, From); 7402 7403 // Build the copy/move for an individual element of the array. 7404 StmtResult Copy = BuildSingleCopyAssign(S, Loc, ArrayTy->getElementType(), 7405 To, From, CopyingBaseSubobject, 7406 Copying, Depth + 1); 7407 if (Copy.isInvalid()) 7408 return StmtError(); 7409 7410 // Construct the loop that copies all elements of this array. 7411 return S.ActOnForStmt(Loc, Loc, InitStmt, 7412 S.MakeFullExpr(Comparison), 7413 0, S.MakeFullExpr(Increment), 7414 Loc, Copy.take()); 7415} 7416 7417std::pair<Sema::ImplicitExceptionSpecification, bool> 7418Sema::ComputeDefaultedCopyAssignmentExceptionSpecAndConst( 7419 CXXRecordDecl *ClassDecl) { 7420 if (ClassDecl->isInvalidDecl()) 7421 return std::make_pair(ImplicitExceptionSpecification(*this), true); 7422 7423 // C++ [class.copy]p10: 7424 // If the class definition does not explicitly declare a copy 7425 // assignment operator, one is declared implicitly. 7426 // The implicitly-defined copy assignment operator for a class X 7427 // will have the form 7428 // 7429 // X& X::operator=(const X&) 7430 // 7431 // if 7432 bool HasConstCopyAssignment = true; 7433 7434 // -- each direct base class B of X has a copy assignment operator 7435 // whose parameter is of type const B&, const volatile B& or B, 7436 // and 7437 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7438 BaseEnd = ClassDecl->bases_end(); 7439 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 7440 // We'll handle this below 7441 if (LangOpts.CPlusPlus0x && Base->isVirtual()) 7442 continue; 7443 7444 assert(!Base->getType()->isDependentType() && 7445 "Cannot generate implicit members for class with dependent bases."); 7446 CXXRecordDecl *BaseClassDecl = Base->getType()->getAsCXXRecordDecl(); 7447 HasConstCopyAssignment &= 7448 (bool)LookupCopyingAssignment(BaseClassDecl, Qualifiers::Const, 7449 false, 0); 7450 } 7451 7452 // In C++11, the above citation has "or virtual" added 7453 if (LangOpts.CPlusPlus0x) { 7454 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7455 BaseEnd = ClassDecl->vbases_end(); 7456 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 7457 assert(!Base->getType()->isDependentType() && 7458 "Cannot generate implicit members for class with dependent bases."); 7459 CXXRecordDecl *BaseClassDecl = Base->getType()->getAsCXXRecordDecl(); 7460 HasConstCopyAssignment &= 7461 (bool)LookupCopyingAssignment(BaseClassDecl, Qualifiers::Const, 7462 false, 0); 7463 } 7464 } 7465 7466 // -- for all the nonstatic data members of X that are of a class 7467 // type M (or array thereof), each such class type has a copy 7468 // assignment operator whose parameter is of type const M&, 7469 // const volatile M& or M. 7470 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7471 FieldEnd = ClassDecl->field_end(); 7472 HasConstCopyAssignment && Field != FieldEnd; 7473 ++Field) { 7474 QualType FieldType = Context.getBaseElementType(Field->getType()); 7475 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7476 HasConstCopyAssignment &= 7477 (bool)LookupCopyingAssignment(FieldClassDecl, Qualifiers::Const, 7478 false, 0); 7479 } 7480 } 7481 7482 // Otherwise, the implicitly declared copy assignment operator will 7483 // have the form 7484 // 7485 // X& X::operator=(X&) 7486 7487 // C++ [except.spec]p14: 7488 // An implicitly declared special member function (Clause 12) shall have an 7489 // exception-specification. [...] 7490 7491 // It is unspecified whether or not an implicit copy assignment operator 7492 // attempts to deduplicate calls to assignment operators of virtual bases are 7493 // made. As such, this exception specification is effectively unspecified. 7494 // Based on a similar decision made for constness in C++0x, we're erring on 7495 // the side of assuming such calls to be made regardless of whether they 7496 // actually happen. 7497 ImplicitExceptionSpecification ExceptSpec(*this); 7498 unsigned ArgQuals = HasConstCopyAssignment ? Qualifiers::Const : 0; 7499 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7500 BaseEnd = ClassDecl->bases_end(); 7501 Base != BaseEnd; ++Base) { 7502 if (Base->isVirtual()) 7503 continue; 7504 7505 CXXRecordDecl *BaseClassDecl 7506 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7507 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 7508 ArgQuals, false, 0)) 7509 ExceptSpec.CalledDecl(Base->getLocStart(), CopyAssign); 7510 } 7511 7512 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7513 BaseEnd = ClassDecl->vbases_end(); 7514 Base != BaseEnd; ++Base) { 7515 CXXRecordDecl *BaseClassDecl 7516 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7517 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 7518 ArgQuals, false, 0)) 7519 ExceptSpec.CalledDecl(Base->getLocStart(), CopyAssign); 7520 } 7521 7522 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7523 FieldEnd = ClassDecl->field_end(); 7524 Field != FieldEnd; 7525 ++Field) { 7526 QualType FieldType = Context.getBaseElementType(Field->getType()); 7527 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7528 if (CXXMethodDecl *CopyAssign = 7529 LookupCopyingAssignment(FieldClassDecl, ArgQuals, false, 0)) 7530 ExceptSpec.CalledDecl(Field->getLocation(), CopyAssign); 7531 } 7532 } 7533 7534 return std::make_pair(ExceptSpec, HasConstCopyAssignment); 7535} 7536 7537CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 7538 // Note: The following rules are largely analoguous to the copy 7539 // constructor rules. Note that virtual bases are not taken into account 7540 // for determining the argument type of the operator. Note also that 7541 // operators taking an object instead of a reference are allowed. 7542 7543 ImplicitExceptionSpecification Spec(*this); 7544 bool Const; 7545 llvm::tie(Spec, Const) = 7546 ComputeDefaultedCopyAssignmentExceptionSpecAndConst(ClassDecl); 7547 7548 QualType ArgType = Context.getTypeDeclType(ClassDecl); 7549 QualType RetType = Context.getLValueReferenceType(ArgType); 7550 if (Const) 7551 ArgType = ArgType.withConst(); 7552 ArgType = Context.getLValueReferenceType(ArgType); 7553 7554 // An implicitly-declared copy assignment operator is an inline public 7555 // member of its class. 7556 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 7557 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 7558 SourceLocation ClassLoc = ClassDecl->getLocation(); 7559 DeclarationNameInfo NameInfo(Name, ClassLoc); 7560 CXXMethodDecl *CopyAssignment 7561 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 7562 Context.getFunctionType(RetType, &ArgType, 1, EPI), 7563 /*TInfo=*/0, /*isStatic=*/false, 7564 /*StorageClassAsWritten=*/SC_None, 7565 /*isInline=*/true, /*isConstexpr=*/false, 7566 SourceLocation()); 7567 CopyAssignment->setAccess(AS_public); 7568 CopyAssignment->setDefaulted(); 7569 CopyAssignment->setImplicit(); 7570 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 7571 7572 // Add the parameter to the operator. 7573 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 7574 ClassLoc, ClassLoc, /*Id=*/0, 7575 ArgType, /*TInfo=*/0, 7576 SC_None, 7577 SC_None, 0); 7578 CopyAssignment->setParams(FromParam); 7579 7580 // Note that we have added this copy-assignment operator. 7581 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 7582 7583 if (Scope *S = getScopeForContext(ClassDecl)) 7584 PushOnScopeChains(CopyAssignment, S, false); 7585 ClassDecl->addDecl(CopyAssignment); 7586 7587 // C++0x [class.copy]p19: 7588 // .... If the class definition does not explicitly declare a copy 7589 // assignment operator, there is no user-declared move constructor, and 7590 // there is no user-declared move assignment operator, a copy assignment 7591 // operator is implicitly declared as defaulted. 7592 if (ShouldDeleteSpecialMember(CopyAssignment, CXXCopyAssignment)) 7593 CopyAssignment->setDeletedAsWritten(); 7594 7595 AddOverriddenMethods(ClassDecl, CopyAssignment); 7596 return CopyAssignment; 7597} 7598 7599void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 7600 CXXMethodDecl *CopyAssignOperator) { 7601 assert((CopyAssignOperator->isDefaulted() && 7602 CopyAssignOperator->isOverloadedOperator() && 7603 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 7604 !CopyAssignOperator->doesThisDeclarationHaveABody() && 7605 !CopyAssignOperator->isDeleted()) && 7606 "DefineImplicitCopyAssignment called for wrong function"); 7607 7608 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 7609 7610 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 7611 CopyAssignOperator->setInvalidDecl(); 7612 return; 7613 } 7614 7615 CopyAssignOperator->setUsed(); 7616 7617 ImplicitlyDefinedFunctionScope Scope(*this, CopyAssignOperator); 7618 DiagnosticErrorTrap Trap(Diags); 7619 7620 // C++0x [class.copy]p30: 7621 // The implicitly-defined or explicitly-defaulted copy assignment operator 7622 // for a non-union class X performs memberwise copy assignment of its 7623 // subobjects. The direct base classes of X are assigned first, in the 7624 // order of their declaration in the base-specifier-list, and then the 7625 // immediate non-static data members of X are assigned, in the order in 7626 // which they were declared in the class definition. 7627 7628 // The statements that form the synthesized function body. 7629 ASTOwningVector<Stmt*> Statements(*this); 7630 7631 // The parameter for the "other" object, which we are copying from. 7632 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 7633 Qualifiers OtherQuals = Other->getType().getQualifiers(); 7634 QualType OtherRefType = Other->getType(); 7635 if (const LValueReferenceType *OtherRef 7636 = OtherRefType->getAs<LValueReferenceType>()) { 7637 OtherRefType = OtherRef->getPointeeType(); 7638 OtherQuals = OtherRefType.getQualifiers(); 7639 } 7640 7641 // Our location for everything implicitly-generated. 7642 SourceLocation Loc = CopyAssignOperator->getLocation(); 7643 7644 // Construct a reference to the "other" object. We'll be using this 7645 // throughout the generated ASTs. 7646 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 7647 assert(OtherRef && "Reference to parameter cannot fail!"); 7648 7649 // Construct the "this" pointer. We'll be using this throughout the generated 7650 // ASTs. 7651 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 7652 assert(This && "Reference to this cannot fail!"); 7653 7654 // Assign base classes. 7655 bool Invalid = false; 7656 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7657 E = ClassDecl->bases_end(); Base != E; ++Base) { 7658 // Form the assignment: 7659 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 7660 QualType BaseType = Base->getType().getUnqualifiedType(); 7661 if (!BaseType->isRecordType()) { 7662 Invalid = true; 7663 continue; 7664 } 7665 7666 CXXCastPath BasePath; 7667 BasePath.push_back(Base); 7668 7669 // Construct the "from" expression, which is an implicit cast to the 7670 // appropriately-qualified base type. 7671 Expr *From = OtherRef; 7672 From = ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 7673 CK_UncheckedDerivedToBase, 7674 VK_LValue, &BasePath).take(); 7675 7676 // Dereference "this". 7677 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 7678 7679 // Implicitly cast "this" to the appropriately-qualified base type. 7680 To = ImpCastExprToType(To.take(), 7681 Context.getCVRQualifiedType(BaseType, 7682 CopyAssignOperator->getTypeQualifiers()), 7683 CK_UncheckedDerivedToBase, 7684 VK_LValue, &BasePath); 7685 7686 // Build the copy. 7687 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, BaseType, 7688 To.get(), From, 7689 /*CopyingBaseSubobject=*/true, 7690 /*Copying=*/true); 7691 if (Copy.isInvalid()) { 7692 Diag(CurrentLocation, diag::note_member_synthesized_at) 7693 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7694 CopyAssignOperator->setInvalidDecl(); 7695 return; 7696 } 7697 7698 // Success! Record the copy. 7699 Statements.push_back(Copy.takeAs<Expr>()); 7700 } 7701 7702 // \brief Reference to the __builtin_memcpy function. 7703 Expr *BuiltinMemCpyRef = 0; 7704 // \brief Reference to the __builtin_objc_memmove_collectable function. 7705 Expr *CollectableMemCpyRef = 0; 7706 7707 // Assign non-static members. 7708 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7709 FieldEnd = ClassDecl->field_end(); 7710 Field != FieldEnd; ++Field) { 7711 if (Field->isUnnamedBitfield()) 7712 continue; 7713 7714 // Check for members of reference type; we can't copy those. 7715 if (Field->getType()->isReferenceType()) { 7716 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 7717 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 7718 Diag(Field->getLocation(), diag::note_declared_at); 7719 Diag(CurrentLocation, diag::note_member_synthesized_at) 7720 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7721 Invalid = true; 7722 continue; 7723 } 7724 7725 // Check for members of const-qualified, non-class type. 7726 QualType BaseType = Context.getBaseElementType(Field->getType()); 7727 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 7728 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 7729 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 7730 Diag(Field->getLocation(), diag::note_declared_at); 7731 Diag(CurrentLocation, diag::note_member_synthesized_at) 7732 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7733 Invalid = true; 7734 continue; 7735 } 7736 7737 // Suppress assigning zero-width bitfields. 7738 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0) 7739 continue; 7740 7741 QualType FieldType = Field->getType().getNonReferenceType(); 7742 if (FieldType->isIncompleteArrayType()) { 7743 assert(ClassDecl->hasFlexibleArrayMember() && 7744 "Incomplete array type is not valid"); 7745 continue; 7746 } 7747 7748 // Build references to the field in the object we're copying from and to. 7749 CXXScopeSpec SS; // Intentionally empty 7750 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 7751 LookupMemberName); 7752 MemberLookup.addDecl(*Field); 7753 MemberLookup.resolveKind(); 7754 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 7755 Loc, /*IsArrow=*/false, 7756 SS, SourceLocation(), 0, 7757 MemberLookup, 0); 7758 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 7759 Loc, /*IsArrow=*/true, 7760 SS, SourceLocation(), 0, 7761 MemberLookup, 0); 7762 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 7763 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 7764 7765 // If the field should be copied with __builtin_memcpy rather than via 7766 // explicit assignments, do so. This optimization only applies for arrays 7767 // of scalars and arrays of class type with trivial copy-assignment 7768 // operators. 7769 if (FieldType->isArrayType() && !FieldType.isVolatileQualified() 7770 && BaseType.hasTrivialAssignment(Context, /*Copying=*/true)) { 7771 // Compute the size of the memory buffer to be copied. 7772 QualType SizeType = Context.getSizeType(); 7773 llvm::APInt Size(Context.getTypeSize(SizeType), 7774 Context.getTypeSizeInChars(BaseType).getQuantity()); 7775 for (const ConstantArrayType *Array 7776 = Context.getAsConstantArrayType(FieldType); 7777 Array; 7778 Array = Context.getAsConstantArrayType(Array->getElementType())) { 7779 llvm::APInt ArraySize 7780 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 7781 Size *= ArraySize; 7782 } 7783 7784 // Take the address of the field references for "from" and "to". 7785 From = CreateBuiltinUnaryOp(Loc, UO_AddrOf, From.get()); 7786 To = CreateBuiltinUnaryOp(Loc, UO_AddrOf, To.get()); 7787 7788 bool NeedsCollectableMemCpy = 7789 (BaseType->isRecordType() && 7790 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 7791 7792 if (NeedsCollectableMemCpy) { 7793 if (!CollectableMemCpyRef) { 7794 // Create a reference to the __builtin_objc_memmove_collectable function. 7795 LookupResult R(*this, 7796 &Context.Idents.get("__builtin_objc_memmove_collectable"), 7797 Loc, LookupOrdinaryName); 7798 LookupName(R, TUScope, true); 7799 7800 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 7801 if (!CollectableMemCpy) { 7802 // Something went horribly wrong earlier, and we will have 7803 // complained about it. 7804 Invalid = true; 7805 continue; 7806 } 7807 7808 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 7809 CollectableMemCpy->getType(), 7810 VK_LValue, Loc, 0).take(); 7811 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 7812 } 7813 } 7814 // Create a reference to the __builtin_memcpy builtin function. 7815 else if (!BuiltinMemCpyRef) { 7816 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 7817 LookupOrdinaryName); 7818 LookupName(R, TUScope, true); 7819 7820 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 7821 if (!BuiltinMemCpy) { 7822 // Something went horribly wrong earlier, and we will have complained 7823 // about it. 7824 Invalid = true; 7825 continue; 7826 } 7827 7828 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 7829 BuiltinMemCpy->getType(), 7830 VK_LValue, Loc, 0).take(); 7831 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 7832 } 7833 7834 ASTOwningVector<Expr*> CallArgs(*this); 7835 CallArgs.push_back(To.takeAs<Expr>()); 7836 CallArgs.push_back(From.takeAs<Expr>()); 7837 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 7838 ExprResult Call = ExprError(); 7839 if (NeedsCollectableMemCpy) 7840 Call = ActOnCallExpr(/*Scope=*/0, 7841 CollectableMemCpyRef, 7842 Loc, move_arg(CallArgs), 7843 Loc); 7844 else 7845 Call = ActOnCallExpr(/*Scope=*/0, 7846 BuiltinMemCpyRef, 7847 Loc, move_arg(CallArgs), 7848 Loc); 7849 7850 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 7851 Statements.push_back(Call.takeAs<Expr>()); 7852 continue; 7853 } 7854 7855 // Build the copy of this field. 7856 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, FieldType, 7857 To.get(), From.get(), 7858 /*CopyingBaseSubobject=*/false, 7859 /*Copying=*/true); 7860 if (Copy.isInvalid()) { 7861 Diag(CurrentLocation, diag::note_member_synthesized_at) 7862 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7863 CopyAssignOperator->setInvalidDecl(); 7864 return; 7865 } 7866 7867 // Success! Record the copy. 7868 Statements.push_back(Copy.takeAs<Stmt>()); 7869 } 7870 7871 if (!Invalid) { 7872 // Add a "return *this;" 7873 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 7874 7875 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 7876 if (Return.isInvalid()) 7877 Invalid = true; 7878 else { 7879 Statements.push_back(Return.takeAs<Stmt>()); 7880 7881 if (Trap.hasErrorOccurred()) { 7882 Diag(CurrentLocation, diag::note_member_synthesized_at) 7883 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7884 Invalid = true; 7885 } 7886 } 7887 } 7888 7889 if (Invalid) { 7890 CopyAssignOperator->setInvalidDecl(); 7891 return; 7892 } 7893 7894 StmtResult Body; 7895 { 7896 CompoundScopeRAII CompoundScope(*this); 7897 Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 7898 /*isStmtExpr=*/false); 7899 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 7900 } 7901 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 7902 7903 if (ASTMutationListener *L = getASTMutationListener()) { 7904 L->CompletedImplicitDefinition(CopyAssignOperator); 7905 } 7906} 7907 7908Sema::ImplicitExceptionSpecification 7909Sema::ComputeDefaultedMoveAssignmentExceptionSpec(CXXRecordDecl *ClassDecl) { 7910 ImplicitExceptionSpecification ExceptSpec(*this); 7911 7912 if (ClassDecl->isInvalidDecl()) 7913 return ExceptSpec; 7914 7915 // C++0x [except.spec]p14: 7916 // An implicitly declared special member function (Clause 12) shall have an 7917 // exception-specification. [...] 7918 7919 // It is unspecified whether or not an implicit move assignment operator 7920 // attempts to deduplicate calls to assignment operators of virtual bases are 7921 // made. As such, this exception specification is effectively unspecified. 7922 // Based on a similar decision made for constness in C++0x, we're erring on 7923 // the side of assuming such calls to be made regardless of whether they 7924 // actually happen. 7925 // Note that a move constructor is not implicitly declared when there are 7926 // virtual bases, but it can still be user-declared and explicitly defaulted. 7927 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7928 BaseEnd = ClassDecl->bases_end(); 7929 Base != BaseEnd; ++Base) { 7930 if (Base->isVirtual()) 7931 continue; 7932 7933 CXXRecordDecl *BaseClassDecl 7934 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7935 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 7936 false, 0)) 7937 ExceptSpec.CalledDecl(Base->getLocStart(), MoveAssign); 7938 } 7939 7940 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7941 BaseEnd = ClassDecl->vbases_end(); 7942 Base != BaseEnd; ++Base) { 7943 CXXRecordDecl *BaseClassDecl 7944 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7945 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 7946 false, 0)) 7947 ExceptSpec.CalledDecl(Base->getLocStart(), MoveAssign); 7948 } 7949 7950 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7951 FieldEnd = ClassDecl->field_end(); 7952 Field != FieldEnd; 7953 ++Field) { 7954 QualType FieldType = Context.getBaseElementType(Field->getType()); 7955 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7956 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(FieldClassDecl, 7957 false, 0)) 7958 ExceptSpec.CalledDecl(Field->getLocation(), MoveAssign); 7959 } 7960 } 7961 7962 return ExceptSpec; 7963} 7964 7965/// Determine whether the class type has any direct or indirect virtual base 7966/// classes which have a non-trivial move assignment operator. 7967static bool 7968hasVirtualBaseWithNonTrivialMoveAssignment(Sema &S, CXXRecordDecl *ClassDecl) { 7969 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7970 BaseEnd = ClassDecl->vbases_end(); 7971 Base != BaseEnd; ++Base) { 7972 CXXRecordDecl *BaseClass = 7973 cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7974 7975 // Try to declare the move assignment. If it would be deleted, then the 7976 // class does not have a non-trivial move assignment. 7977 if (BaseClass->needsImplicitMoveAssignment()) 7978 S.DeclareImplicitMoveAssignment(BaseClass); 7979 7980 // If the class has both a trivial move assignment and a non-trivial move 7981 // assignment, hasTrivialMoveAssignment() is false. 7982 if (BaseClass->hasDeclaredMoveAssignment() && 7983 !BaseClass->hasTrivialMoveAssignment()) 7984 return true; 7985 } 7986 7987 return false; 7988} 7989 7990/// Determine whether the given type either has a move constructor or is 7991/// trivially copyable. 7992static bool 7993hasMoveOrIsTriviallyCopyable(Sema &S, QualType Type, bool IsConstructor) { 7994 Type = S.Context.getBaseElementType(Type); 7995 7996 // FIXME: Technically, non-trivially-copyable non-class types, such as 7997 // reference types, are supposed to return false here, but that appears 7998 // to be a standard defect. 7999 CXXRecordDecl *ClassDecl = Type->getAsCXXRecordDecl(); 8000 if (!ClassDecl || !ClassDecl->getDefinition()) 8001 return true; 8002 8003 if (Type.isTriviallyCopyableType(S.Context)) 8004 return true; 8005 8006 if (IsConstructor) { 8007 if (ClassDecl->needsImplicitMoveConstructor()) 8008 S.DeclareImplicitMoveConstructor(ClassDecl); 8009 return ClassDecl->hasDeclaredMoveConstructor(); 8010 } 8011 8012 if (ClassDecl->needsImplicitMoveAssignment()) 8013 S.DeclareImplicitMoveAssignment(ClassDecl); 8014 return ClassDecl->hasDeclaredMoveAssignment(); 8015} 8016 8017/// Determine whether all non-static data members and direct or virtual bases 8018/// of class \p ClassDecl have either a move operation, or are trivially 8019/// copyable. 8020static bool subobjectsHaveMoveOrTrivialCopy(Sema &S, CXXRecordDecl *ClassDecl, 8021 bool IsConstructor) { 8022 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8023 BaseEnd = ClassDecl->bases_end(); 8024 Base != BaseEnd; ++Base) { 8025 if (Base->isVirtual()) 8026 continue; 8027 8028 if (!hasMoveOrIsTriviallyCopyable(S, Base->getType(), IsConstructor)) 8029 return false; 8030 } 8031 8032 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8033 BaseEnd = ClassDecl->vbases_end(); 8034 Base != BaseEnd; ++Base) { 8035 if (!hasMoveOrIsTriviallyCopyable(S, Base->getType(), IsConstructor)) 8036 return false; 8037 } 8038 8039 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8040 FieldEnd = ClassDecl->field_end(); 8041 Field != FieldEnd; ++Field) { 8042 if (!hasMoveOrIsTriviallyCopyable(S, Field->getType(), IsConstructor)) 8043 return false; 8044 } 8045 8046 return true; 8047} 8048 8049CXXMethodDecl *Sema::DeclareImplicitMoveAssignment(CXXRecordDecl *ClassDecl) { 8050 // C++11 [class.copy]p20: 8051 // If the definition of a class X does not explicitly declare a move 8052 // assignment operator, one will be implicitly declared as defaulted 8053 // if and only if: 8054 // 8055 // - [first 4 bullets] 8056 assert(ClassDecl->needsImplicitMoveAssignment()); 8057 8058 // [Checked after we build the declaration] 8059 // - the move assignment operator would not be implicitly defined as 8060 // deleted, 8061 8062 // [DR1402]: 8063 // - X has no direct or indirect virtual base class with a non-trivial 8064 // move assignment operator, and 8065 // - each of X's non-static data members and direct or virtual base classes 8066 // has a type that either has a move assignment operator or is trivially 8067 // copyable. 8068 if (hasVirtualBaseWithNonTrivialMoveAssignment(*this, ClassDecl) || 8069 !subobjectsHaveMoveOrTrivialCopy(*this, ClassDecl,/*Constructor*/false)) { 8070 ClassDecl->setFailedImplicitMoveAssignment(); 8071 return 0; 8072 } 8073 8074 // Note: The following rules are largely analoguous to the move 8075 // constructor rules. 8076 8077 ImplicitExceptionSpecification Spec( 8078 ComputeDefaultedMoveAssignmentExceptionSpec(ClassDecl)); 8079 8080 QualType ArgType = Context.getTypeDeclType(ClassDecl); 8081 QualType RetType = Context.getLValueReferenceType(ArgType); 8082 ArgType = Context.getRValueReferenceType(ArgType); 8083 8084 // An implicitly-declared move assignment operator is an inline public 8085 // member of its class. 8086 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 8087 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 8088 SourceLocation ClassLoc = ClassDecl->getLocation(); 8089 DeclarationNameInfo NameInfo(Name, ClassLoc); 8090 CXXMethodDecl *MoveAssignment 8091 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 8092 Context.getFunctionType(RetType, &ArgType, 1, EPI), 8093 /*TInfo=*/0, /*isStatic=*/false, 8094 /*StorageClassAsWritten=*/SC_None, 8095 /*isInline=*/true, 8096 /*isConstexpr=*/false, 8097 SourceLocation()); 8098 MoveAssignment->setAccess(AS_public); 8099 MoveAssignment->setDefaulted(); 8100 MoveAssignment->setImplicit(); 8101 MoveAssignment->setTrivial(ClassDecl->hasTrivialMoveAssignment()); 8102 8103 // Add the parameter to the operator. 8104 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveAssignment, 8105 ClassLoc, ClassLoc, /*Id=*/0, 8106 ArgType, /*TInfo=*/0, 8107 SC_None, 8108 SC_None, 0); 8109 MoveAssignment->setParams(FromParam); 8110 8111 // Note that we have added this copy-assignment operator. 8112 ++ASTContext::NumImplicitMoveAssignmentOperatorsDeclared; 8113 8114 // C++0x [class.copy]p9: 8115 // If the definition of a class X does not explicitly declare a move 8116 // assignment operator, one will be implicitly declared as defaulted if and 8117 // only if: 8118 // [...] 8119 // - the move assignment operator would not be implicitly defined as 8120 // deleted. 8121 if (ShouldDeleteSpecialMember(MoveAssignment, CXXMoveAssignment)) { 8122 // Cache this result so that we don't try to generate this over and over 8123 // on every lookup, leaking memory and wasting time. 8124 ClassDecl->setFailedImplicitMoveAssignment(); 8125 return 0; 8126 } 8127 8128 if (Scope *S = getScopeForContext(ClassDecl)) 8129 PushOnScopeChains(MoveAssignment, S, false); 8130 ClassDecl->addDecl(MoveAssignment); 8131 8132 AddOverriddenMethods(ClassDecl, MoveAssignment); 8133 return MoveAssignment; 8134} 8135 8136void Sema::DefineImplicitMoveAssignment(SourceLocation CurrentLocation, 8137 CXXMethodDecl *MoveAssignOperator) { 8138 assert((MoveAssignOperator->isDefaulted() && 8139 MoveAssignOperator->isOverloadedOperator() && 8140 MoveAssignOperator->getOverloadedOperator() == OO_Equal && 8141 !MoveAssignOperator->doesThisDeclarationHaveABody() && 8142 !MoveAssignOperator->isDeleted()) && 8143 "DefineImplicitMoveAssignment called for wrong function"); 8144 8145 CXXRecordDecl *ClassDecl = MoveAssignOperator->getParent(); 8146 8147 if (ClassDecl->isInvalidDecl() || MoveAssignOperator->isInvalidDecl()) { 8148 MoveAssignOperator->setInvalidDecl(); 8149 return; 8150 } 8151 8152 MoveAssignOperator->setUsed(); 8153 8154 ImplicitlyDefinedFunctionScope Scope(*this, MoveAssignOperator); 8155 DiagnosticErrorTrap Trap(Diags); 8156 8157 // C++0x [class.copy]p28: 8158 // The implicitly-defined or move assignment operator for a non-union class 8159 // X performs memberwise move assignment of its subobjects. The direct base 8160 // classes of X are assigned first, in the order of their declaration in the 8161 // base-specifier-list, and then the immediate non-static data members of X 8162 // are assigned, in the order in which they were declared in the class 8163 // definition. 8164 8165 // The statements that form the synthesized function body. 8166 ASTOwningVector<Stmt*> Statements(*this); 8167 8168 // The parameter for the "other" object, which we are move from. 8169 ParmVarDecl *Other = MoveAssignOperator->getParamDecl(0); 8170 QualType OtherRefType = Other->getType()-> 8171 getAs<RValueReferenceType>()->getPointeeType(); 8172 assert(OtherRefType.getQualifiers() == 0 && 8173 "Bad argument type of defaulted move assignment"); 8174 8175 // Our location for everything implicitly-generated. 8176 SourceLocation Loc = MoveAssignOperator->getLocation(); 8177 8178 // Construct a reference to the "other" object. We'll be using this 8179 // throughout the generated ASTs. 8180 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 8181 assert(OtherRef && "Reference to parameter cannot fail!"); 8182 // Cast to rvalue. 8183 OtherRef = CastForMoving(*this, OtherRef); 8184 8185 // Construct the "this" pointer. We'll be using this throughout the generated 8186 // ASTs. 8187 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 8188 assert(This && "Reference to this cannot fail!"); 8189 8190 // Assign base classes. 8191 bool Invalid = false; 8192 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8193 E = ClassDecl->bases_end(); Base != E; ++Base) { 8194 // Form the assignment: 8195 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&&>(other)); 8196 QualType BaseType = Base->getType().getUnqualifiedType(); 8197 if (!BaseType->isRecordType()) { 8198 Invalid = true; 8199 continue; 8200 } 8201 8202 CXXCastPath BasePath; 8203 BasePath.push_back(Base); 8204 8205 // Construct the "from" expression, which is an implicit cast to the 8206 // appropriately-qualified base type. 8207 Expr *From = OtherRef; 8208 From = ImpCastExprToType(From, BaseType, CK_UncheckedDerivedToBase, 8209 VK_XValue, &BasePath).take(); 8210 8211 // Dereference "this". 8212 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8213 8214 // Implicitly cast "this" to the appropriately-qualified base type. 8215 To = ImpCastExprToType(To.take(), 8216 Context.getCVRQualifiedType(BaseType, 8217 MoveAssignOperator->getTypeQualifiers()), 8218 CK_UncheckedDerivedToBase, 8219 VK_LValue, &BasePath); 8220 8221 // Build the move. 8222 StmtResult Move = BuildSingleCopyAssign(*this, Loc, BaseType, 8223 To.get(), From, 8224 /*CopyingBaseSubobject=*/true, 8225 /*Copying=*/false); 8226 if (Move.isInvalid()) { 8227 Diag(CurrentLocation, diag::note_member_synthesized_at) 8228 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8229 MoveAssignOperator->setInvalidDecl(); 8230 return; 8231 } 8232 8233 // Success! Record the move. 8234 Statements.push_back(Move.takeAs<Expr>()); 8235 } 8236 8237 // \brief Reference to the __builtin_memcpy function. 8238 Expr *BuiltinMemCpyRef = 0; 8239 // \brief Reference to the __builtin_objc_memmove_collectable function. 8240 Expr *CollectableMemCpyRef = 0; 8241 8242 // Assign non-static members. 8243 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8244 FieldEnd = ClassDecl->field_end(); 8245 Field != FieldEnd; ++Field) { 8246 if (Field->isUnnamedBitfield()) 8247 continue; 8248 8249 // Check for members of reference type; we can't move those. 8250 if (Field->getType()->isReferenceType()) { 8251 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8252 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 8253 Diag(Field->getLocation(), diag::note_declared_at); 8254 Diag(CurrentLocation, diag::note_member_synthesized_at) 8255 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8256 Invalid = true; 8257 continue; 8258 } 8259 8260 // Check for members of const-qualified, non-class type. 8261 QualType BaseType = Context.getBaseElementType(Field->getType()); 8262 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 8263 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8264 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 8265 Diag(Field->getLocation(), diag::note_declared_at); 8266 Diag(CurrentLocation, diag::note_member_synthesized_at) 8267 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8268 Invalid = true; 8269 continue; 8270 } 8271 8272 // Suppress assigning zero-width bitfields. 8273 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0) 8274 continue; 8275 8276 QualType FieldType = Field->getType().getNonReferenceType(); 8277 if (FieldType->isIncompleteArrayType()) { 8278 assert(ClassDecl->hasFlexibleArrayMember() && 8279 "Incomplete array type is not valid"); 8280 continue; 8281 } 8282 8283 // Build references to the field in the object we're copying from and to. 8284 CXXScopeSpec SS; // Intentionally empty 8285 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 8286 LookupMemberName); 8287 MemberLookup.addDecl(*Field); 8288 MemberLookup.resolveKind(); 8289 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 8290 Loc, /*IsArrow=*/false, 8291 SS, SourceLocation(), 0, 8292 MemberLookup, 0); 8293 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 8294 Loc, /*IsArrow=*/true, 8295 SS, SourceLocation(), 0, 8296 MemberLookup, 0); 8297 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 8298 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 8299 8300 assert(!From.get()->isLValue() && // could be xvalue or prvalue 8301 "Member reference with rvalue base must be rvalue except for reference " 8302 "members, which aren't allowed for move assignment."); 8303 8304 // If the field should be copied with __builtin_memcpy rather than via 8305 // explicit assignments, do so. This optimization only applies for arrays 8306 // of scalars and arrays of class type with trivial move-assignment 8307 // operators. 8308 if (FieldType->isArrayType() && !FieldType.isVolatileQualified() 8309 && BaseType.hasTrivialAssignment(Context, /*Copying=*/false)) { 8310 // Compute the size of the memory buffer to be copied. 8311 QualType SizeType = Context.getSizeType(); 8312 llvm::APInt Size(Context.getTypeSize(SizeType), 8313 Context.getTypeSizeInChars(BaseType).getQuantity()); 8314 for (const ConstantArrayType *Array 8315 = Context.getAsConstantArrayType(FieldType); 8316 Array; 8317 Array = Context.getAsConstantArrayType(Array->getElementType())) { 8318 llvm::APInt ArraySize 8319 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 8320 Size *= ArraySize; 8321 } 8322 8323 // Take the address of the field references for "from" and "to". We 8324 // directly construct UnaryOperators here because semantic analysis 8325 // does not permit us to take the address of an xvalue. 8326 From = new (Context) UnaryOperator(From.get(), UO_AddrOf, 8327 Context.getPointerType(From.get()->getType()), 8328 VK_RValue, OK_Ordinary, Loc); 8329 To = new (Context) UnaryOperator(To.get(), UO_AddrOf, 8330 Context.getPointerType(To.get()->getType()), 8331 VK_RValue, OK_Ordinary, Loc); 8332 8333 bool NeedsCollectableMemCpy = 8334 (BaseType->isRecordType() && 8335 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 8336 8337 if (NeedsCollectableMemCpy) { 8338 if (!CollectableMemCpyRef) { 8339 // Create a reference to the __builtin_objc_memmove_collectable function. 8340 LookupResult R(*this, 8341 &Context.Idents.get("__builtin_objc_memmove_collectable"), 8342 Loc, LookupOrdinaryName); 8343 LookupName(R, TUScope, true); 8344 8345 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 8346 if (!CollectableMemCpy) { 8347 // Something went horribly wrong earlier, and we will have 8348 // complained about it. 8349 Invalid = true; 8350 continue; 8351 } 8352 8353 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 8354 CollectableMemCpy->getType(), 8355 VK_LValue, Loc, 0).take(); 8356 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 8357 } 8358 } 8359 // Create a reference to the __builtin_memcpy builtin function. 8360 else if (!BuiltinMemCpyRef) { 8361 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 8362 LookupOrdinaryName); 8363 LookupName(R, TUScope, true); 8364 8365 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 8366 if (!BuiltinMemCpy) { 8367 // Something went horribly wrong earlier, and we will have complained 8368 // about it. 8369 Invalid = true; 8370 continue; 8371 } 8372 8373 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 8374 BuiltinMemCpy->getType(), 8375 VK_LValue, Loc, 0).take(); 8376 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 8377 } 8378 8379 ASTOwningVector<Expr*> CallArgs(*this); 8380 CallArgs.push_back(To.takeAs<Expr>()); 8381 CallArgs.push_back(From.takeAs<Expr>()); 8382 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 8383 ExprResult Call = ExprError(); 8384 if (NeedsCollectableMemCpy) 8385 Call = ActOnCallExpr(/*Scope=*/0, 8386 CollectableMemCpyRef, 8387 Loc, move_arg(CallArgs), 8388 Loc); 8389 else 8390 Call = ActOnCallExpr(/*Scope=*/0, 8391 BuiltinMemCpyRef, 8392 Loc, move_arg(CallArgs), 8393 Loc); 8394 8395 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 8396 Statements.push_back(Call.takeAs<Expr>()); 8397 continue; 8398 } 8399 8400 // Build the move of this field. 8401 StmtResult Move = BuildSingleCopyAssign(*this, Loc, FieldType, 8402 To.get(), From.get(), 8403 /*CopyingBaseSubobject=*/false, 8404 /*Copying=*/false); 8405 if (Move.isInvalid()) { 8406 Diag(CurrentLocation, diag::note_member_synthesized_at) 8407 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8408 MoveAssignOperator->setInvalidDecl(); 8409 return; 8410 } 8411 8412 // Success! Record the copy. 8413 Statements.push_back(Move.takeAs<Stmt>()); 8414 } 8415 8416 if (!Invalid) { 8417 // Add a "return *this;" 8418 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8419 8420 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 8421 if (Return.isInvalid()) 8422 Invalid = true; 8423 else { 8424 Statements.push_back(Return.takeAs<Stmt>()); 8425 8426 if (Trap.hasErrorOccurred()) { 8427 Diag(CurrentLocation, diag::note_member_synthesized_at) 8428 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8429 Invalid = true; 8430 } 8431 } 8432 } 8433 8434 if (Invalid) { 8435 MoveAssignOperator->setInvalidDecl(); 8436 return; 8437 } 8438 8439 StmtResult Body; 8440 { 8441 CompoundScopeRAII CompoundScope(*this); 8442 Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 8443 /*isStmtExpr=*/false); 8444 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 8445 } 8446 MoveAssignOperator->setBody(Body.takeAs<Stmt>()); 8447 8448 if (ASTMutationListener *L = getASTMutationListener()) { 8449 L->CompletedImplicitDefinition(MoveAssignOperator); 8450 } 8451} 8452 8453std::pair<Sema::ImplicitExceptionSpecification, bool> 8454Sema::ComputeDefaultedCopyCtorExceptionSpecAndConst(CXXRecordDecl *ClassDecl) { 8455 if (ClassDecl->isInvalidDecl()) 8456 return std::make_pair(ImplicitExceptionSpecification(*this), true); 8457 8458 // C++ [class.copy]p5: 8459 // The implicitly-declared copy constructor for a class X will 8460 // have the form 8461 // 8462 // X::X(const X&) 8463 // 8464 // if 8465 // FIXME: It ought to be possible to store this on the record. 8466 bool HasConstCopyConstructor = true; 8467 8468 // -- each direct or virtual base class B of X has a copy 8469 // constructor whose first parameter is of type const B& or 8470 // const volatile B&, and 8471 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8472 BaseEnd = ClassDecl->bases_end(); 8473 HasConstCopyConstructor && Base != BaseEnd; 8474 ++Base) { 8475 // Virtual bases are handled below. 8476 if (Base->isVirtual()) 8477 continue; 8478 8479 CXXRecordDecl *BaseClassDecl 8480 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8481 HasConstCopyConstructor &= 8482 (bool)LookupCopyingConstructor(BaseClassDecl, Qualifiers::Const); 8483 } 8484 8485 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8486 BaseEnd = ClassDecl->vbases_end(); 8487 HasConstCopyConstructor && Base != BaseEnd; 8488 ++Base) { 8489 CXXRecordDecl *BaseClassDecl 8490 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8491 HasConstCopyConstructor &= 8492 (bool)LookupCopyingConstructor(BaseClassDecl, Qualifiers::Const); 8493 } 8494 8495 // -- for all the nonstatic data members of X that are of a 8496 // class type M (or array thereof), each such class type 8497 // has a copy constructor whose first parameter is of type 8498 // const M& or const volatile M&. 8499 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8500 FieldEnd = ClassDecl->field_end(); 8501 HasConstCopyConstructor && Field != FieldEnd; 8502 ++Field) { 8503 QualType FieldType = Context.getBaseElementType(Field->getType()); 8504 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8505 HasConstCopyConstructor &= 8506 (bool)LookupCopyingConstructor(FieldClassDecl, Qualifiers::Const); 8507 } 8508 } 8509 // Otherwise, the implicitly declared copy constructor will have 8510 // the form 8511 // 8512 // X::X(X&) 8513 8514 // C++ [except.spec]p14: 8515 // An implicitly declared special member function (Clause 12) shall have an 8516 // exception-specification. [...] 8517 ImplicitExceptionSpecification ExceptSpec(*this); 8518 unsigned Quals = HasConstCopyConstructor? Qualifiers::Const : 0; 8519 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8520 BaseEnd = ClassDecl->bases_end(); 8521 Base != BaseEnd; 8522 ++Base) { 8523 // Virtual bases are handled below. 8524 if (Base->isVirtual()) 8525 continue; 8526 8527 CXXRecordDecl *BaseClassDecl 8528 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8529 if (CXXConstructorDecl *CopyConstructor = 8530 LookupCopyingConstructor(BaseClassDecl, Quals)) 8531 ExceptSpec.CalledDecl(Base->getLocStart(), CopyConstructor); 8532 } 8533 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8534 BaseEnd = ClassDecl->vbases_end(); 8535 Base != BaseEnd; 8536 ++Base) { 8537 CXXRecordDecl *BaseClassDecl 8538 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8539 if (CXXConstructorDecl *CopyConstructor = 8540 LookupCopyingConstructor(BaseClassDecl, Quals)) 8541 ExceptSpec.CalledDecl(Base->getLocStart(), CopyConstructor); 8542 } 8543 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8544 FieldEnd = ClassDecl->field_end(); 8545 Field != FieldEnd; 8546 ++Field) { 8547 QualType FieldType = Context.getBaseElementType(Field->getType()); 8548 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8549 if (CXXConstructorDecl *CopyConstructor = 8550 LookupCopyingConstructor(FieldClassDecl, Quals)) 8551 ExceptSpec.CalledDecl(Field->getLocation(), CopyConstructor); 8552 } 8553 } 8554 8555 return std::make_pair(ExceptSpec, HasConstCopyConstructor); 8556} 8557 8558CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 8559 CXXRecordDecl *ClassDecl) { 8560 // C++ [class.copy]p4: 8561 // If the class definition does not explicitly declare a copy 8562 // constructor, one is declared implicitly. 8563 8564 ImplicitExceptionSpecification Spec(*this); 8565 bool Const; 8566 llvm::tie(Spec, Const) = 8567 ComputeDefaultedCopyCtorExceptionSpecAndConst(ClassDecl); 8568 8569 QualType ClassType = Context.getTypeDeclType(ClassDecl); 8570 QualType ArgType = ClassType; 8571 if (Const) 8572 ArgType = ArgType.withConst(); 8573 ArgType = Context.getLValueReferenceType(ArgType); 8574 8575 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 8576 8577 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, 8578 CXXCopyConstructor, 8579 Const); 8580 8581 DeclarationName Name 8582 = Context.DeclarationNames.getCXXConstructorName( 8583 Context.getCanonicalType(ClassType)); 8584 SourceLocation ClassLoc = ClassDecl->getLocation(); 8585 DeclarationNameInfo NameInfo(Name, ClassLoc); 8586 8587 // An implicitly-declared copy constructor is an inline public 8588 // member of its class. 8589 CXXConstructorDecl *CopyConstructor = CXXConstructorDecl::Create( 8590 Context, ClassDecl, ClassLoc, NameInfo, 8591 Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI), /*TInfo=*/0, 8592 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 8593 Constexpr); 8594 CopyConstructor->setAccess(AS_public); 8595 CopyConstructor->setDefaulted(); 8596 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 8597 8598 // Note that we have declared this constructor. 8599 ++ASTContext::NumImplicitCopyConstructorsDeclared; 8600 8601 // Add the parameter to the constructor. 8602 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 8603 ClassLoc, ClassLoc, 8604 /*IdentifierInfo=*/0, 8605 ArgType, /*TInfo=*/0, 8606 SC_None, 8607 SC_None, 0); 8608 CopyConstructor->setParams(FromParam); 8609 8610 if (Scope *S = getScopeForContext(ClassDecl)) 8611 PushOnScopeChains(CopyConstructor, S, false); 8612 ClassDecl->addDecl(CopyConstructor); 8613 8614 // C++11 [class.copy]p8: 8615 // ... If the class definition does not explicitly declare a copy 8616 // constructor, there is no user-declared move constructor, and there is no 8617 // user-declared move assignment operator, a copy constructor is implicitly 8618 // declared as defaulted. 8619 if (ShouldDeleteSpecialMember(CopyConstructor, CXXCopyConstructor)) 8620 CopyConstructor->setDeletedAsWritten(); 8621 8622 return CopyConstructor; 8623} 8624 8625void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 8626 CXXConstructorDecl *CopyConstructor) { 8627 assert((CopyConstructor->isDefaulted() && 8628 CopyConstructor->isCopyConstructor() && 8629 !CopyConstructor->doesThisDeclarationHaveABody() && 8630 !CopyConstructor->isDeleted()) && 8631 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 8632 8633 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 8634 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 8635 8636 ImplicitlyDefinedFunctionScope Scope(*this, CopyConstructor); 8637 DiagnosticErrorTrap Trap(Diags); 8638 8639 if (SetCtorInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) || 8640 Trap.hasErrorOccurred()) { 8641 Diag(CurrentLocation, diag::note_member_synthesized_at) 8642 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 8643 CopyConstructor->setInvalidDecl(); 8644 } else { 8645 Sema::CompoundScopeRAII CompoundScope(*this); 8646 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 8647 CopyConstructor->getLocation(), 8648 MultiStmtArg(*this, 0, 0), 8649 /*isStmtExpr=*/false) 8650 .takeAs<Stmt>()); 8651 CopyConstructor->setImplicitlyDefined(true); 8652 } 8653 8654 CopyConstructor->setUsed(); 8655 if (ASTMutationListener *L = getASTMutationListener()) { 8656 L->CompletedImplicitDefinition(CopyConstructor); 8657 } 8658} 8659 8660Sema::ImplicitExceptionSpecification 8661Sema::ComputeDefaultedMoveCtorExceptionSpec(CXXRecordDecl *ClassDecl) { 8662 // C++ [except.spec]p14: 8663 // An implicitly declared special member function (Clause 12) shall have an 8664 // exception-specification. [...] 8665 ImplicitExceptionSpecification ExceptSpec(*this); 8666 if (ClassDecl->isInvalidDecl()) 8667 return ExceptSpec; 8668 8669 // Direct base-class constructors. 8670 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 8671 BEnd = ClassDecl->bases_end(); 8672 B != BEnd; ++B) { 8673 if (B->isVirtual()) // Handled below. 8674 continue; 8675 8676 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 8677 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 8678 CXXConstructorDecl *Constructor = LookupMovingConstructor(BaseClassDecl); 8679 // If this is a deleted function, add it anyway. This might be conformant 8680 // with the standard. This might not. I'm not sure. It might not matter. 8681 if (Constructor) 8682 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 8683 } 8684 } 8685 8686 // Virtual base-class constructors. 8687 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 8688 BEnd = ClassDecl->vbases_end(); 8689 B != BEnd; ++B) { 8690 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 8691 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 8692 CXXConstructorDecl *Constructor = LookupMovingConstructor(BaseClassDecl); 8693 // If this is a deleted function, add it anyway. This might be conformant 8694 // with the standard. This might not. I'm not sure. It might not matter. 8695 if (Constructor) 8696 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 8697 } 8698 } 8699 8700 // Field constructors. 8701 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 8702 FEnd = ClassDecl->field_end(); 8703 F != FEnd; ++F) { 8704 if (const RecordType *RecordTy 8705 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 8706 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 8707 CXXConstructorDecl *Constructor = LookupMovingConstructor(FieldRecDecl); 8708 // If this is a deleted function, add it anyway. This might be conformant 8709 // with the standard. This might not. I'm not sure. It might not matter. 8710 // In particular, the problem is that this function never gets called. It 8711 // might just be ill-formed because this function attempts to refer to 8712 // a deleted function here. 8713 if (Constructor) 8714 ExceptSpec.CalledDecl(F->getLocation(), Constructor); 8715 } 8716 } 8717 8718 return ExceptSpec; 8719} 8720 8721CXXConstructorDecl *Sema::DeclareImplicitMoveConstructor( 8722 CXXRecordDecl *ClassDecl) { 8723 // C++11 [class.copy]p9: 8724 // If the definition of a class X does not explicitly declare a move 8725 // constructor, one will be implicitly declared as defaulted if and only if: 8726 // 8727 // - [first 4 bullets] 8728 assert(ClassDecl->needsImplicitMoveConstructor()); 8729 8730 // [Checked after we build the declaration] 8731 // - the move assignment operator would not be implicitly defined as 8732 // deleted, 8733 8734 // [DR1402]: 8735 // - each of X's non-static data members and direct or virtual base classes 8736 // has a type that either has a move constructor or is trivially copyable. 8737 if (!subobjectsHaveMoveOrTrivialCopy(*this, ClassDecl, /*Constructor*/true)) { 8738 ClassDecl->setFailedImplicitMoveConstructor(); 8739 return 0; 8740 } 8741 8742 ImplicitExceptionSpecification Spec( 8743 ComputeDefaultedMoveCtorExceptionSpec(ClassDecl)); 8744 8745 QualType ClassType = Context.getTypeDeclType(ClassDecl); 8746 QualType ArgType = Context.getRValueReferenceType(ClassType); 8747 8748 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 8749 8750 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, 8751 CXXMoveConstructor, 8752 false); 8753 8754 DeclarationName Name 8755 = Context.DeclarationNames.getCXXConstructorName( 8756 Context.getCanonicalType(ClassType)); 8757 SourceLocation ClassLoc = ClassDecl->getLocation(); 8758 DeclarationNameInfo NameInfo(Name, ClassLoc); 8759 8760 // C++0x [class.copy]p11: 8761 // An implicitly-declared copy/move constructor is an inline public 8762 // member of its class. 8763 CXXConstructorDecl *MoveConstructor = CXXConstructorDecl::Create( 8764 Context, ClassDecl, ClassLoc, NameInfo, 8765 Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI), /*TInfo=*/0, 8766 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 8767 Constexpr); 8768 MoveConstructor->setAccess(AS_public); 8769 MoveConstructor->setDefaulted(); 8770 MoveConstructor->setTrivial(ClassDecl->hasTrivialMoveConstructor()); 8771 8772 // Add the parameter to the constructor. 8773 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveConstructor, 8774 ClassLoc, ClassLoc, 8775 /*IdentifierInfo=*/0, 8776 ArgType, /*TInfo=*/0, 8777 SC_None, 8778 SC_None, 0); 8779 MoveConstructor->setParams(FromParam); 8780 8781 // C++0x [class.copy]p9: 8782 // If the definition of a class X does not explicitly declare a move 8783 // constructor, one will be implicitly declared as defaulted if and only if: 8784 // [...] 8785 // - the move constructor would not be implicitly defined as deleted. 8786 if (ShouldDeleteSpecialMember(MoveConstructor, CXXMoveConstructor)) { 8787 // Cache this result so that we don't try to generate this over and over 8788 // on every lookup, leaking memory and wasting time. 8789 ClassDecl->setFailedImplicitMoveConstructor(); 8790 return 0; 8791 } 8792 8793 // Note that we have declared this constructor. 8794 ++ASTContext::NumImplicitMoveConstructorsDeclared; 8795 8796 if (Scope *S = getScopeForContext(ClassDecl)) 8797 PushOnScopeChains(MoveConstructor, S, false); 8798 ClassDecl->addDecl(MoveConstructor); 8799 8800 return MoveConstructor; 8801} 8802 8803void Sema::DefineImplicitMoveConstructor(SourceLocation CurrentLocation, 8804 CXXConstructorDecl *MoveConstructor) { 8805 assert((MoveConstructor->isDefaulted() && 8806 MoveConstructor->isMoveConstructor() && 8807 !MoveConstructor->doesThisDeclarationHaveABody() && 8808 !MoveConstructor->isDeleted()) && 8809 "DefineImplicitMoveConstructor - call it for implicit move ctor"); 8810 8811 CXXRecordDecl *ClassDecl = MoveConstructor->getParent(); 8812 assert(ClassDecl && "DefineImplicitMoveConstructor - invalid constructor"); 8813 8814 ImplicitlyDefinedFunctionScope Scope(*this, MoveConstructor); 8815 DiagnosticErrorTrap Trap(Diags); 8816 8817 if (SetCtorInitializers(MoveConstructor, 0, 0, /*AnyErrors=*/false) || 8818 Trap.hasErrorOccurred()) { 8819 Diag(CurrentLocation, diag::note_member_synthesized_at) 8820 << CXXMoveConstructor << Context.getTagDeclType(ClassDecl); 8821 MoveConstructor->setInvalidDecl(); 8822 } else { 8823 Sema::CompoundScopeRAII CompoundScope(*this); 8824 MoveConstructor->setBody(ActOnCompoundStmt(MoveConstructor->getLocation(), 8825 MoveConstructor->getLocation(), 8826 MultiStmtArg(*this, 0, 0), 8827 /*isStmtExpr=*/false) 8828 .takeAs<Stmt>()); 8829 MoveConstructor->setImplicitlyDefined(true); 8830 } 8831 8832 MoveConstructor->setUsed(); 8833 8834 if (ASTMutationListener *L = getASTMutationListener()) { 8835 L->CompletedImplicitDefinition(MoveConstructor); 8836 } 8837} 8838 8839bool Sema::isImplicitlyDeleted(FunctionDecl *FD) { 8840 return FD->isDeleted() && 8841 (FD->isDefaulted() || FD->isImplicit()) && 8842 isa<CXXMethodDecl>(FD); 8843} 8844 8845/// \brief Mark the call operator of the given lambda closure type as "used". 8846static void markLambdaCallOperatorUsed(Sema &S, CXXRecordDecl *Lambda) { 8847 CXXMethodDecl *CallOperator 8848 = cast<CXXMethodDecl>( 8849 *Lambda->lookup( 8850 S.Context.DeclarationNames.getCXXOperatorName(OO_Call)).first); 8851 CallOperator->setReferenced(); 8852 CallOperator->setUsed(); 8853} 8854 8855void Sema::DefineImplicitLambdaToFunctionPointerConversion( 8856 SourceLocation CurrentLocation, 8857 CXXConversionDecl *Conv) 8858{ 8859 CXXRecordDecl *Lambda = Conv->getParent(); 8860 8861 // Make sure that the lambda call operator is marked used. 8862 markLambdaCallOperatorUsed(*this, Lambda); 8863 8864 Conv->setUsed(); 8865 8866 ImplicitlyDefinedFunctionScope Scope(*this, Conv); 8867 DiagnosticErrorTrap Trap(Diags); 8868 8869 // Return the address of the __invoke function. 8870 DeclarationName InvokeName = &Context.Idents.get("__invoke"); 8871 CXXMethodDecl *Invoke 8872 = cast<CXXMethodDecl>(*Lambda->lookup(InvokeName).first); 8873 Expr *FunctionRef = BuildDeclRefExpr(Invoke, Invoke->getType(), 8874 VK_LValue, Conv->getLocation()).take(); 8875 assert(FunctionRef && "Can't refer to __invoke function?"); 8876 Stmt *Return = ActOnReturnStmt(Conv->getLocation(), FunctionRef).take(); 8877 Conv->setBody(new (Context) CompoundStmt(Context, &Return, 1, 8878 Conv->getLocation(), 8879 Conv->getLocation())); 8880 8881 // Fill in the __invoke function with a dummy implementation. IR generation 8882 // will fill in the actual details. 8883 Invoke->setUsed(); 8884 Invoke->setReferenced(); 8885 Invoke->setBody(new (Context) CompoundStmt(Context, 0, 0, Conv->getLocation(), 8886 Conv->getLocation())); 8887 8888 if (ASTMutationListener *L = getASTMutationListener()) { 8889 L->CompletedImplicitDefinition(Conv); 8890 L->CompletedImplicitDefinition(Invoke); 8891 } 8892} 8893 8894void Sema::DefineImplicitLambdaToBlockPointerConversion( 8895 SourceLocation CurrentLocation, 8896 CXXConversionDecl *Conv) 8897{ 8898 Conv->setUsed(); 8899 8900 ImplicitlyDefinedFunctionScope Scope(*this, Conv); 8901 DiagnosticErrorTrap Trap(Diags); 8902 8903 // Copy-initialize the lambda object as needed to capture it. 8904 Expr *This = ActOnCXXThis(CurrentLocation).take(); 8905 Expr *DerefThis =CreateBuiltinUnaryOp(CurrentLocation, UO_Deref, This).take(); 8906 8907 ExprResult BuildBlock = BuildBlockForLambdaConversion(CurrentLocation, 8908 Conv->getLocation(), 8909 Conv, DerefThis); 8910 8911 // If we're not under ARC, make sure we still get the _Block_copy/autorelease 8912 // behavior. Note that only the general conversion function does this 8913 // (since it's unusable otherwise); in the case where we inline the 8914 // block literal, it has block literal lifetime semantics. 8915 if (!BuildBlock.isInvalid() && !getLangOpts().ObjCAutoRefCount) 8916 BuildBlock = ImplicitCastExpr::Create(Context, BuildBlock.get()->getType(), 8917 CK_CopyAndAutoreleaseBlockObject, 8918 BuildBlock.get(), 0, VK_RValue); 8919 8920 if (BuildBlock.isInvalid()) { 8921 Diag(CurrentLocation, diag::note_lambda_to_block_conv); 8922 Conv->setInvalidDecl(); 8923 return; 8924 } 8925 8926 // Create the return statement that returns the block from the conversion 8927 // function. 8928 StmtResult Return = ActOnReturnStmt(Conv->getLocation(), BuildBlock.get()); 8929 if (Return.isInvalid()) { 8930 Diag(CurrentLocation, diag::note_lambda_to_block_conv); 8931 Conv->setInvalidDecl(); 8932 return; 8933 } 8934 8935 // Set the body of the conversion function. 8936 Stmt *ReturnS = Return.take(); 8937 Conv->setBody(new (Context) CompoundStmt(Context, &ReturnS, 1, 8938 Conv->getLocation(), 8939 Conv->getLocation())); 8940 8941 // We're done; notify the mutation listener, if any. 8942 if (ASTMutationListener *L = getASTMutationListener()) { 8943 L->CompletedImplicitDefinition(Conv); 8944 } 8945} 8946 8947/// \brief Determine whether the given list arguments contains exactly one 8948/// "real" (non-default) argument. 8949static bool hasOneRealArgument(MultiExprArg Args) { 8950 switch (Args.size()) { 8951 case 0: 8952 return false; 8953 8954 default: 8955 if (!Args.get()[1]->isDefaultArgument()) 8956 return false; 8957 8958 // fall through 8959 case 1: 8960 return !Args.get()[0]->isDefaultArgument(); 8961 } 8962 8963 return false; 8964} 8965 8966ExprResult 8967Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 8968 CXXConstructorDecl *Constructor, 8969 MultiExprArg ExprArgs, 8970 bool HadMultipleCandidates, 8971 bool RequiresZeroInit, 8972 unsigned ConstructKind, 8973 SourceRange ParenRange) { 8974 bool Elidable = false; 8975 8976 // C++0x [class.copy]p34: 8977 // When certain criteria are met, an implementation is allowed to 8978 // omit the copy/move construction of a class object, even if the 8979 // copy/move constructor and/or destructor for the object have 8980 // side effects. [...] 8981 // - when a temporary class object that has not been bound to a 8982 // reference (12.2) would be copied/moved to a class object 8983 // with the same cv-unqualified type, the copy/move operation 8984 // can be omitted by constructing the temporary object 8985 // directly into the target of the omitted copy/move 8986 if (ConstructKind == CXXConstructExpr::CK_Complete && 8987 Constructor->isCopyOrMoveConstructor() && hasOneRealArgument(ExprArgs)) { 8988 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 8989 Elidable = SubExpr->isTemporaryObject(Context, Constructor->getParent()); 8990 } 8991 8992 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 8993 Elidable, move(ExprArgs), HadMultipleCandidates, 8994 RequiresZeroInit, ConstructKind, ParenRange); 8995} 8996 8997/// BuildCXXConstructExpr - Creates a complete call to a constructor, 8998/// including handling of its default argument expressions. 8999ExprResult 9000Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 9001 CXXConstructorDecl *Constructor, bool Elidable, 9002 MultiExprArg ExprArgs, 9003 bool HadMultipleCandidates, 9004 bool RequiresZeroInit, 9005 unsigned ConstructKind, 9006 SourceRange ParenRange) { 9007 unsigned NumExprs = ExprArgs.size(); 9008 Expr **Exprs = (Expr **)ExprArgs.release(); 9009 9010 for (specific_attr_iterator<NonNullAttr> 9011 i = Constructor->specific_attr_begin<NonNullAttr>(), 9012 e = Constructor->specific_attr_end<NonNullAttr>(); i != e; ++i) { 9013 const NonNullAttr *NonNull = *i; 9014 CheckNonNullArguments(NonNull, ExprArgs.get(), ConstructLoc); 9015 } 9016 9017 MarkFunctionReferenced(ConstructLoc, Constructor); 9018 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 9019 Constructor, Elidable, Exprs, NumExprs, 9020 HadMultipleCandidates, /*FIXME*/false, 9021 RequiresZeroInit, 9022 static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind), 9023 ParenRange)); 9024} 9025 9026bool Sema::InitializeVarWithConstructor(VarDecl *VD, 9027 CXXConstructorDecl *Constructor, 9028 MultiExprArg Exprs, 9029 bool HadMultipleCandidates) { 9030 // FIXME: Provide the correct paren SourceRange when available. 9031 ExprResult TempResult = 9032 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 9033 move(Exprs), HadMultipleCandidates, false, 9034 CXXConstructExpr::CK_Complete, SourceRange()); 9035 if (TempResult.isInvalid()) 9036 return true; 9037 9038 Expr *Temp = TempResult.takeAs<Expr>(); 9039 CheckImplicitConversions(Temp, VD->getLocation()); 9040 MarkFunctionReferenced(VD->getLocation(), Constructor); 9041 Temp = MaybeCreateExprWithCleanups(Temp); 9042 VD->setInit(Temp); 9043 9044 return false; 9045} 9046 9047void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 9048 if (VD->isInvalidDecl()) return; 9049 9050 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 9051 if (ClassDecl->isInvalidDecl()) return; 9052 if (ClassDecl->hasIrrelevantDestructor()) return; 9053 if (ClassDecl->isDependentContext()) return; 9054 9055 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 9056 MarkFunctionReferenced(VD->getLocation(), Destructor); 9057 CheckDestructorAccess(VD->getLocation(), Destructor, 9058 PDiag(diag::err_access_dtor_var) 9059 << VD->getDeclName() 9060 << VD->getType()); 9061 DiagnoseUseOfDecl(Destructor, VD->getLocation()); 9062 9063 if (!VD->hasGlobalStorage()) return; 9064 9065 // Emit warning for non-trivial dtor in global scope (a real global, 9066 // class-static, function-static). 9067 Diag(VD->getLocation(), diag::warn_exit_time_destructor); 9068 9069 // TODO: this should be re-enabled for static locals by !CXAAtExit 9070 if (!VD->isStaticLocal()) 9071 Diag(VD->getLocation(), diag::warn_global_destructor); 9072} 9073 9074/// \brief Given a constructor and the set of arguments provided for the 9075/// constructor, convert the arguments and add any required default arguments 9076/// to form a proper call to this constructor. 9077/// 9078/// \returns true if an error occurred, false otherwise. 9079bool 9080Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 9081 MultiExprArg ArgsPtr, 9082 SourceLocation Loc, 9083 ASTOwningVector<Expr*> &ConvertedArgs, 9084 bool AllowExplicit) { 9085 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 9086 unsigned NumArgs = ArgsPtr.size(); 9087 Expr **Args = (Expr **)ArgsPtr.get(); 9088 9089 const FunctionProtoType *Proto 9090 = Constructor->getType()->getAs<FunctionProtoType>(); 9091 assert(Proto && "Constructor without a prototype?"); 9092 unsigned NumArgsInProto = Proto->getNumArgs(); 9093 9094 // If too few arguments are available, we'll fill in the rest with defaults. 9095 if (NumArgs < NumArgsInProto) 9096 ConvertedArgs.reserve(NumArgsInProto); 9097 else 9098 ConvertedArgs.reserve(NumArgs); 9099 9100 VariadicCallType CallType = 9101 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 9102 SmallVector<Expr *, 8> AllArgs; 9103 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 9104 Proto, 0, Args, NumArgs, AllArgs, 9105 CallType, AllowExplicit); 9106 ConvertedArgs.append(AllArgs.begin(), AllArgs.end()); 9107 9108 DiagnoseSentinelCalls(Constructor, Loc, AllArgs.data(), AllArgs.size()); 9109 9110 // FIXME: Missing call to CheckFunctionCall or equivalent 9111 9112 return Invalid; 9113} 9114 9115static inline bool 9116CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 9117 const FunctionDecl *FnDecl) { 9118 const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext(); 9119 if (isa<NamespaceDecl>(DC)) { 9120 return SemaRef.Diag(FnDecl->getLocation(), 9121 diag::err_operator_new_delete_declared_in_namespace) 9122 << FnDecl->getDeclName(); 9123 } 9124 9125 if (isa<TranslationUnitDecl>(DC) && 9126 FnDecl->getStorageClass() == SC_Static) { 9127 return SemaRef.Diag(FnDecl->getLocation(), 9128 diag::err_operator_new_delete_declared_static) 9129 << FnDecl->getDeclName(); 9130 } 9131 9132 return false; 9133} 9134 9135static inline bool 9136CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 9137 CanQualType ExpectedResultType, 9138 CanQualType ExpectedFirstParamType, 9139 unsigned DependentParamTypeDiag, 9140 unsigned InvalidParamTypeDiag) { 9141 QualType ResultType = 9142 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 9143 9144 // Check that the result type is not dependent. 9145 if (ResultType->isDependentType()) 9146 return SemaRef.Diag(FnDecl->getLocation(), 9147 diag::err_operator_new_delete_dependent_result_type) 9148 << FnDecl->getDeclName() << ExpectedResultType; 9149 9150 // Check that the result type is what we expect. 9151 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 9152 return SemaRef.Diag(FnDecl->getLocation(), 9153 diag::err_operator_new_delete_invalid_result_type) 9154 << FnDecl->getDeclName() << ExpectedResultType; 9155 9156 // A function template must have at least 2 parameters. 9157 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 9158 return SemaRef.Diag(FnDecl->getLocation(), 9159 diag::err_operator_new_delete_template_too_few_parameters) 9160 << FnDecl->getDeclName(); 9161 9162 // The function decl must have at least 1 parameter. 9163 if (FnDecl->getNumParams() == 0) 9164 return SemaRef.Diag(FnDecl->getLocation(), 9165 diag::err_operator_new_delete_too_few_parameters) 9166 << FnDecl->getDeclName(); 9167 9168 // Check the the first parameter type is not dependent. 9169 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 9170 if (FirstParamType->isDependentType()) 9171 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 9172 << FnDecl->getDeclName() << ExpectedFirstParamType; 9173 9174 // Check that the first parameter type is what we expect. 9175 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 9176 ExpectedFirstParamType) 9177 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 9178 << FnDecl->getDeclName() << ExpectedFirstParamType; 9179 9180 return false; 9181} 9182 9183static bool 9184CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 9185 // C++ [basic.stc.dynamic.allocation]p1: 9186 // A program is ill-formed if an allocation function is declared in a 9187 // namespace scope other than global scope or declared static in global 9188 // scope. 9189 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 9190 return true; 9191 9192 CanQualType SizeTy = 9193 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 9194 9195 // C++ [basic.stc.dynamic.allocation]p1: 9196 // The return type shall be void*. The first parameter shall have type 9197 // std::size_t. 9198 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 9199 SizeTy, 9200 diag::err_operator_new_dependent_param_type, 9201 diag::err_operator_new_param_type)) 9202 return true; 9203 9204 // C++ [basic.stc.dynamic.allocation]p1: 9205 // The first parameter shall not have an associated default argument. 9206 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 9207 return SemaRef.Diag(FnDecl->getLocation(), 9208 diag::err_operator_new_default_arg) 9209 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 9210 9211 return false; 9212} 9213 9214static bool 9215CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 9216 // C++ [basic.stc.dynamic.deallocation]p1: 9217 // A program is ill-formed if deallocation functions are declared in a 9218 // namespace scope other than global scope or declared static in global 9219 // scope. 9220 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 9221 return true; 9222 9223 // C++ [basic.stc.dynamic.deallocation]p2: 9224 // Each deallocation function shall return void and its first parameter 9225 // shall be void*. 9226 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 9227 SemaRef.Context.VoidPtrTy, 9228 diag::err_operator_delete_dependent_param_type, 9229 diag::err_operator_delete_param_type)) 9230 return true; 9231 9232 return false; 9233} 9234 9235/// CheckOverloadedOperatorDeclaration - Check whether the declaration 9236/// of this overloaded operator is well-formed. If so, returns false; 9237/// otherwise, emits appropriate diagnostics and returns true. 9238bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 9239 assert(FnDecl && FnDecl->isOverloadedOperator() && 9240 "Expected an overloaded operator declaration"); 9241 9242 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 9243 9244 // C++ [over.oper]p5: 9245 // The allocation and deallocation functions, operator new, 9246 // operator new[], operator delete and operator delete[], are 9247 // described completely in 3.7.3. The attributes and restrictions 9248 // found in the rest of this subclause do not apply to them unless 9249 // explicitly stated in 3.7.3. 9250 if (Op == OO_Delete || Op == OO_Array_Delete) 9251 return CheckOperatorDeleteDeclaration(*this, FnDecl); 9252 9253 if (Op == OO_New || Op == OO_Array_New) 9254 return CheckOperatorNewDeclaration(*this, FnDecl); 9255 9256 // C++ [over.oper]p6: 9257 // An operator function shall either be a non-static member 9258 // function or be a non-member function and have at least one 9259 // parameter whose type is a class, a reference to a class, an 9260 // enumeration, or a reference to an enumeration. 9261 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 9262 if (MethodDecl->isStatic()) 9263 return Diag(FnDecl->getLocation(), 9264 diag::err_operator_overload_static) << FnDecl->getDeclName(); 9265 } else { 9266 bool ClassOrEnumParam = false; 9267 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 9268 ParamEnd = FnDecl->param_end(); 9269 Param != ParamEnd; ++Param) { 9270 QualType ParamType = (*Param)->getType().getNonReferenceType(); 9271 if (ParamType->isDependentType() || ParamType->isRecordType() || 9272 ParamType->isEnumeralType()) { 9273 ClassOrEnumParam = true; 9274 break; 9275 } 9276 } 9277 9278 if (!ClassOrEnumParam) 9279 return Diag(FnDecl->getLocation(), 9280 diag::err_operator_overload_needs_class_or_enum) 9281 << FnDecl->getDeclName(); 9282 } 9283 9284 // C++ [over.oper]p8: 9285 // An operator function cannot have default arguments (8.3.6), 9286 // except where explicitly stated below. 9287 // 9288 // Only the function-call operator allows default arguments 9289 // (C++ [over.call]p1). 9290 if (Op != OO_Call) { 9291 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 9292 Param != FnDecl->param_end(); ++Param) { 9293 if ((*Param)->hasDefaultArg()) 9294 return Diag((*Param)->getLocation(), 9295 diag::err_operator_overload_default_arg) 9296 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 9297 } 9298 } 9299 9300 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 9301 { false, false, false } 9302#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 9303 , { Unary, Binary, MemberOnly } 9304#include "clang/Basic/OperatorKinds.def" 9305 }; 9306 9307 bool CanBeUnaryOperator = OperatorUses[Op][0]; 9308 bool CanBeBinaryOperator = OperatorUses[Op][1]; 9309 bool MustBeMemberOperator = OperatorUses[Op][2]; 9310 9311 // C++ [over.oper]p8: 9312 // [...] Operator functions cannot have more or fewer parameters 9313 // than the number required for the corresponding operator, as 9314 // described in the rest of this subclause. 9315 unsigned NumParams = FnDecl->getNumParams() 9316 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 9317 if (Op != OO_Call && 9318 ((NumParams == 1 && !CanBeUnaryOperator) || 9319 (NumParams == 2 && !CanBeBinaryOperator) || 9320 (NumParams < 1) || (NumParams > 2))) { 9321 // We have the wrong number of parameters. 9322 unsigned ErrorKind; 9323 if (CanBeUnaryOperator && CanBeBinaryOperator) { 9324 ErrorKind = 2; // 2 -> unary or binary. 9325 } else if (CanBeUnaryOperator) { 9326 ErrorKind = 0; // 0 -> unary 9327 } else { 9328 assert(CanBeBinaryOperator && 9329 "All non-call overloaded operators are unary or binary!"); 9330 ErrorKind = 1; // 1 -> binary 9331 } 9332 9333 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 9334 << FnDecl->getDeclName() << NumParams << ErrorKind; 9335 } 9336 9337 // Overloaded operators other than operator() cannot be variadic. 9338 if (Op != OO_Call && 9339 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 9340 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 9341 << FnDecl->getDeclName(); 9342 } 9343 9344 // Some operators must be non-static member functions. 9345 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 9346 return Diag(FnDecl->getLocation(), 9347 diag::err_operator_overload_must_be_member) 9348 << FnDecl->getDeclName(); 9349 } 9350 9351 // C++ [over.inc]p1: 9352 // The user-defined function called operator++ implements the 9353 // prefix and postfix ++ operator. If this function is a member 9354 // function with no parameters, or a non-member function with one 9355 // parameter of class or enumeration type, it defines the prefix 9356 // increment operator ++ for objects of that type. If the function 9357 // is a member function with one parameter (which shall be of type 9358 // int) or a non-member function with two parameters (the second 9359 // of which shall be of type int), it defines the postfix 9360 // increment operator ++ for objects of that type. 9361 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 9362 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 9363 bool ParamIsInt = false; 9364 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 9365 ParamIsInt = BT->getKind() == BuiltinType::Int; 9366 9367 if (!ParamIsInt) 9368 return Diag(LastParam->getLocation(), 9369 diag::err_operator_overload_post_incdec_must_be_int) 9370 << LastParam->getType() << (Op == OO_MinusMinus); 9371 } 9372 9373 return false; 9374} 9375 9376/// CheckLiteralOperatorDeclaration - Check whether the declaration 9377/// of this literal operator function is well-formed. If so, returns 9378/// false; otherwise, emits appropriate diagnostics and returns true. 9379bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 9380 if (isa<CXXMethodDecl>(FnDecl)) { 9381 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 9382 << FnDecl->getDeclName(); 9383 return true; 9384 } 9385 9386 if (FnDecl->isExternC()) { 9387 Diag(FnDecl->getLocation(), diag::err_literal_operator_extern_c); 9388 return true; 9389 } 9390 9391 bool Valid = false; 9392 9393 // This might be the definition of a literal operator template. 9394 FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate(); 9395 // This might be a specialization of a literal operator template. 9396 if (!TpDecl) 9397 TpDecl = FnDecl->getPrimaryTemplate(); 9398 9399 // template <char...> type operator "" name() is the only valid template 9400 // signature, and the only valid signature with no parameters. 9401 if (TpDecl) { 9402 if (FnDecl->param_size() == 0) { 9403 // Must have only one template parameter 9404 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 9405 if (Params->size() == 1) { 9406 NonTypeTemplateParmDecl *PmDecl = 9407 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 9408 9409 // The template parameter must be a char parameter pack. 9410 if (PmDecl && PmDecl->isTemplateParameterPack() && 9411 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 9412 Valid = true; 9413 } 9414 } 9415 } else if (FnDecl->param_size()) { 9416 // Check the first parameter 9417 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 9418 9419 QualType T = (*Param)->getType().getUnqualifiedType(); 9420 9421 // unsigned long long int, long double, and any character type are allowed 9422 // as the only parameters. 9423 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 9424 Context.hasSameType(T, Context.LongDoubleTy) || 9425 Context.hasSameType(T, Context.CharTy) || 9426 Context.hasSameType(T, Context.WCharTy) || 9427 Context.hasSameType(T, Context.Char16Ty) || 9428 Context.hasSameType(T, Context.Char32Ty)) { 9429 if (++Param == FnDecl->param_end()) 9430 Valid = true; 9431 goto FinishedParams; 9432 } 9433 9434 // Otherwise it must be a pointer to const; let's strip those qualifiers. 9435 const PointerType *PT = T->getAs<PointerType>(); 9436 if (!PT) 9437 goto FinishedParams; 9438 T = PT->getPointeeType(); 9439 if (!T.isConstQualified() || T.isVolatileQualified()) 9440 goto FinishedParams; 9441 T = T.getUnqualifiedType(); 9442 9443 // Move on to the second parameter; 9444 ++Param; 9445 9446 // If there is no second parameter, the first must be a const char * 9447 if (Param == FnDecl->param_end()) { 9448 if (Context.hasSameType(T, Context.CharTy)) 9449 Valid = true; 9450 goto FinishedParams; 9451 } 9452 9453 // const char *, const wchar_t*, const char16_t*, and const char32_t* 9454 // are allowed as the first parameter to a two-parameter function 9455 if (!(Context.hasSameType(T, Context.CharTy) || 9456 Context.hasSameType(T, Context.WCharTy) || 9457 Context.hasSameType(T, Context.Char16Ty) || 9458 Context.hasSameType(T, Context.Char32Ty))) 9459 goto FinishedParams; 9460 9461 // The second and final parameter must be an std::size_t 9462 T = (*Param)->getType().getUnqualifiedType(); 9463 if (Context.hasSameType(T, Context.getSizeType()) && 9464 ++Param == FnDecl->param_end()) 9465 Valid = true; 9466 } 9467 9468 // FIXME: This diagnostic is absolutely terrible. 9469FinishedParams: 9470 if (!Valid) { 9471 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 9472 << FnDecl->getDeclName(); 9473 return true; 9474 } 9475 9476 // A parameter-declaration-clause containing a default argument is not 9477 // equivalent to any of the permitted forms. 9478 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 9479 ParamEnd = FnDecl->param_end(); 9480 Param != ParamEnd; ++Param) { 9481 if ((*Param)->hasDefaultArg()) { 9482 Diag((*Param)->getDefaultArgRange().getBegin(), 9483 diag::err_literal_operator_default_argument) 9484 << (*Param)->getDefaultArgRange(); 9485 break; 9486 } 9487 } 9488 9489 StringRef LiteralName 9490 = FnDecl->getDeclName().getCXXLiteralIdentifier()->getName(); 9491 if (LiteralName[0] != '_') { 9492 // C++11 [usrlit.suffix]p1: 9493 // Literal suffix identifiers that do not start with an underscore 9494 // are reserved for future standardization. 9495 Diag(FnDecl->getLocation(), diag::warn_user_literal_reserved); 9496 } 9497 9498 return false; 9499} 9500 9501/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 9502/// linkage specification, including the language and (if present) 9503/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 9504/// the location of the language string literal, which is provided 9505/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 9506/// the '{' brace. Otherwise, this linkage specification does not 9507/// have any braces. 9508Decl *Sema::ActOnStartLinkageSpecification(Scope *S, SourceLocation ExternLoc, 9509 SourceLocation LangLoc, 9510 StringRef Lang, 9511 SourceLocation LBraceLoc) { 9512 LinkageSpecDecl::LanguageIDs Language; 9513 if (Lang == "\"C\"") 9514 Language = LinkageSpecDecl::lang_c; 9515 else if (Lang == "\"C++\"") 9516 Language = LinkageSpecDecl::lang_cxx; 9517 else { 9518 Diag(LangLoc, diag::err_bad_language); 9519 return 0; 9520 } 9521 9522 // FIXME: Add all the various semantics of linkage specifications 9523 9524 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 9525 ExternLoc, LangLoc, Language); 9526 CurContext->addDecl(D); 9527 PushDeclContext(S, D); 9528 return D; 9529} 9530 9531/// ActOnFinishLinkageSpecification - Complete the definition of 9532/// the C++ linkage specification LinkageSpec. If RBraceLoc is 9533/// valid, it's the position of the closing '}' brace in a linkage 9534/// specification that uses braces. 9535Decl *Sema::ActOnFinishLinkageSpecification(Scope *S, 9536 Decl *LinkageSpec, 9537 SourceLocation RBraceLoc) { 9538 if (LinkageSpec) { 9539 if (RBraceLoc.isValid()) { 9540 LinkageSpecDecl* LSDecl = cast<LinkageSpecDecl>(LinkageSpec); 9541 LSDecl->setRBraceLoc(RBraceLoc); 9542 } 9543 PopDeclContext(); 9544 } 9545 return LinkageSpec; 9546} 9547 9548/// \brief Perform semantic analysis for the variable declaration that 9549/// occurs within a C++ catch clause, returning the newly-created 9550/// variable. 9551VarDecl *Sema::BuildExceptionDeclaration(Scope *S, 9552 TypeSourceInfo *TInfo, 9553 SourceLocation StartLoc, 9554 SourceLocation Loc, 9555 IdentifierInfo *Name) { 9556 bool Invalid = false; 9557 QualType ExDeclType = TInfo->getType(); 9558 9559 // Arrays and functions decay. 9560 if (ExDeclType->isArrayType()) 9561 ExDeclType = Context.getArrayDecayedType(ExDeclType); 9562 else if (ExDeclType->isFunctionType()) 9563 ExDeclType = Context.getPointerType(ExDeclType); 9564 9565 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 9566 // The exception-declaration shall not denote a pointer or reference to an 9567 // incomplete type, other than [cv] void*. 9568 // N2844 forbids rvalue references. 9569 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 9570 Diag(Loc, diag::err_catch_rvalue_ref); 9571 Invalid = true; 9572 } 9573 9574 QualType BaseType = ExDeclType; 9575 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 9576 unsigned DK = diag::err_catch_incomplete; 9577 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 9578 BaseType = Ptr->getPointeeType(); 9579 Mode = 1; 9580 DK = diag::err_catch_incomplete_ptr; 9581 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 9582 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 9583 BaseType = Ref->getPointeeType(); 9584 Mode = 2; 9585 DK = diag::err_catch_incomplete_ref; 9586 } 9587 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 9588 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK)) 9589 Invalid = true; 9590 9591 if (!Invalid && !ExDeclType->isDependentType() && 9592 RequireNonAbstractType(Loc, ExDeclType, 9593 diag::err_abstract_type_in_decl, 9594 AbstractVariableType)) 9595 Invalid = true; 9596 9597 // Only the non-fragile NeXT runtime currently supports C++ catches 9598 // of ObjC types, and no runtime supports catching ObjC types by value. 9599 if (!Invalid && getLangOpts().ObjC1) { 9600 QualType T = ExDeclType; 9601 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 9602 T = RT->getPointeeType(); 9603 9604 if (T->isObjCObjectType()) { 9605 Diag(Loc, diag::err_objc_object_catch); 9606 Invalid = true; 9607 } else if (T->isObjCObjectPointerType()) { 9608 if (!getLangOpts().ObjCNonFragileABI) 9609 Diag(Loc, diag::warn_objc_pointer_cxx_catch_fragile); 9610 } 9611 } 9612 9613 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, StartLoc, Loc, Name, 9614 ExDeclType, TInfo, SC_None, SC_None); 9615 ExDecl->setExceptionVariable(true); 9616 9617 // In ARC, infer 'retaining' for variables of retainable type. 9618 if (getLangOpts().ObjCAutoRefCount && inferObjCARCLifetime(ExDecl)) 9619 Invalid = true; 9620 9621 if (!Invalid && !ExDeclType->isDependentType()) { 9622 if (const RecordType *recordType = ExDeclType->getAs<RecordType>()) { 9623 // C++ [except.handle]p16: 9624 // The object declared in an exception-declaration or, if the 9625 // exception-declaration does not specify a name, a temporary (12.2) is 9626 // copy-initialized (8.5) from the exception object. [...] 9627 // The object is destroyed when the handler exits, after the destruction 9628 // of any automatic objects initialized within the handler. 9629 // 9630 // We just pretend to initialize the object with itself, then make sure 9631 // it can be destroyed later. 9632 QualType initType = ExDeclType; 9633 9634 InitializedEntity entity = 9635 InitializedEntity::InitializeVariable(ExDecl); 9636 InitializationKind initKind = 9637 InitializationKind::CreateCopy(Loc, SourceLocation()); 9638 9639 Expr *opaqueValue = 9640 new (Context) OpaqueValueExpr(Loc, initType, VK_LValue, OK_Ordinary); 9641 InitializationSequence sequence(*this, entity, initKind, &opaqueValue, 1); 9642 ExprResult result = sequence.Perform(*this, entity, initKind, 9643 MultiExprArg(&opaqueValue, 1)); 9644 if (result.isInvalid()) 9645 Invalid = true; 9646 else { 9647 // If the constructor used was non-trivial, set this as the 9648 // "initializer". 9649 CXXConstructExpr *construct = cast<CXXConstructExpr>(result.take()); 9650 if (!construct->getConstructor()->isTrivial()) { 9651 Expr *init = MaybeCreateExprWithCleanups(construct); 9652 ExDecl->setInit(init); 9653 } 9654 9655 // And make sure it's destructable. 9656 FinalizeVarWithDestructor(ExDecl, recordType); 9657 } 9658 } 9659 } 9660 9661 if (Invalid) 9662 ExDecl->setInvalidDecl(); 9663 9664 return ExDecl; 9665} 9666 9667/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 9668/// handler. 9669Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 9670 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 9671 bool Invalid = D.isInvalidType(); 9672 9673 // Check for unexpanded parameter packs. 9674 if (TInfo && DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 9675 UPPC_ExceptionType)) { 9676 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 9677 D.getIdentifierLoc()); 9678 Invalid = true; 9679 } 9680 9681 IdentifierInfo *II = D.getIdentifier(); 9682 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 9683 LookupOrdinaryName, 9684 ForRedeclaration)) { 9685 // The scope should be freshly made just for us. There is just no way 9686 // it contains any previous declaration. 9687 assert(!S->isDeclScope(PrevDecl)); 9688 if (PrevDecl->isTemplateParameter()) { 9689 // Maybe we will complain about the shadowed template parameter. 9690 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 9691 PrevDecl = 0; 9692 } 9693 } 9694 9695 if (D.getCXXScopeSpec().isSet() && !Invalid) { 9696 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 9697 << D.getCXXScopeSpec().getRange(); 9698 Invalid = true; 9699 } 9700 9701 VarDecl *ExDecl = BuildExceptionDeclaration(S, TInfo, 9702 D.getLocStart(), 9703 D.getIdentifierLoc(), 9704 D.getIdentifier()); 9705 if (Invalid) 9706 ExDecl->setInvalidDecl(); 9707 9708 // Add the exception declaration into this scope. 9709 if (II) 9710 PushOnScopeChains(ExDecl, S); 9711 else 9712 CurContext->addDecl(ExDecl); 9713 9714 ProcessDeclAttributes(S, ExDecl, D); 9715 return ExDecl; 9716} 9717 9718Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation StaticAssertLoc, 9719 Expr *AssertExpr, 9720 Expr *AssertMessageExpr_, 9721 SourceLocation RParenLoc) { 9722 StringLiteral *AssertMessage = cast<StringLiteral>(AssertMessageExpr_); 9723 9724 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 9725 // In a static_assert-declaration, the constant-expression shall be a 9726 // constant expression that can be contextually converted to bool. 9727 ExprResult Converted = PerformContextuallyConvertToBool(AssertExpr); 9728 if (Converted.isInvalid()) 9729 return 0; 9730 9731 llvm::APSInt Cond; 9732 if (VerifyIntegerConstantExpression(Converted.get(), &Cond, 9733 diag::err_static_assert_expression_is_not_constant, 9734 /*AllowFold=*/false).isInvalid()) 9735 return 0; 9736 9737 if (!Cond) { 9738 llvm::SmallString<256> MsgBuffer; 9739 llvm::raw_svector_ostream Msg(MsgBuffer); 9740 AssertMessage->printPretty(Msg, Context, 0, getPrintingPolicy()); 9741 Diag(StaticAssertLoc, diag::err_static_assert_failed) 9742 << Msg.str() << AssertExpr->getSourceRange(); 9743 } 9744 } 9745 9746 if (DiagnoseUnexpandedParameterPack(AssertExpr, UPPC_StaticAssertExpression)) 9747 return 0; 9748 9749 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, StaticAssertLoc, 9750 AssertExpr, AssertMessage, RParenLoc); 9751 9752 CurContext->addDecl(Decl); 9753 return Decl; 9754} 9755 9756/// \brief Perform semantic analysis of the given friend type declaration. 9757/// 9758/// \returns A friend declaration that. 9759FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation Loc, 9760 SourceLocation FriendLoc, 9761 TypeSourceInfo *TSInfo) { 9762 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 9763 9764 QualType T = TSInfo->getType(); 9765 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 9766 9767 // C++03 [class.friend]p2: 9768 // An elaborated-type-specifier shall be used in a friend declaration 9769 // for a class.* 9770 // 9771 // * The class-key of the elaborated-type-specifier is required. 9772 if (!ActiveTemplateInstantiations.empty()) { 9773 // Do not complain about the form of friend template types during 9774 // template instantiation; we will already have complained when the 9775 // template was declared. 9776 } else if (!T->isElaboratedTypeSpecifier()) { 9777 // If we evaluated the type to a record type, suggest putting 9778 // a tag in front. 9779 if (const RecordType *RT = T->getAs<RecordType>()) { 9780 RecordDecl *RD = RT->getDecl(); 9781 9782 std::string InsertionText = std::string(" ") + RD->getKindName(); 9783 9784 Diag(TypeRange.getBegin(), 9785 getLangOpts().CPlusPlus0x ? 9786 diag::warn_cxx98_compat_unelaborated_friend_type : 9787 diag::ext_unelaborated_friend_type) 9788 << (unsigned) RD->getTagKind() 9789 << T 9790 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 9791 InsertionText); 9792 } else { 9793 Diag(FriendLoc, 9794 getLangOpts().CPlusPlus0x ? 9795 diag::warn_cxx98_compat_nonclass_type_friend : 9796 diag::ext_nonclass_type_friend) 9797 << T 9798 << SourceRange(FriendLoc, TypeRange.getEnd()); 9799 } 9800 } else if (T->getAs<EnumType>()) { 9801 Diag(FriendLoc, 9802 getLangOpts().CPlusPlus0x ? 9803 diag::warn_cxx98_compat_enum_friend : 9804 diag::ext_enum_friend) 9805 << T 9806 << SourceRange(FriendLoc, TypeRange.getEnd()); 9807 } 9808 9809 // C++0x [class.friend]p3: 9810 // If the type specifier in a friend declaration designates a (possibly 9811 // cv-qualified) class type, that class is declared as a friend; otherwise, 9812 // the friend declaration is ignored. 9813 9814 // FIXME: C++0x has some syntactic restrictions on friend type declarations 9815 // in [class.friend]p3 that we do not implement. 9816 9817 return FriendDecl::Create(Context, CurContext, Loc, TSInfo, FriendLoc); 9818} 9819 9820/// Handle a friend tag declaration where the scope specifier was 9821/// templated. 9822Decl *Sema::ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc, 9823 unsigned TagSpec, SourceLocation TagLoc, 9824 CXXScopeSpec &SS, 9825 IdentifierInfo *Name, SourceLocation NameLoc, 9826 AttributeList *Attr, 9827 MultiTemplateParamsArg TempParamLists) { 9828 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 9829 9830 bool isExplicitSpecialization = false; 9831 bool Invalid = false; 9832 9833 if (TemplateParameterList *TemplateParams 9834 = MatchTemplateParametersToScopeSpecifier(TagLoc, NameLoc, SS, 9835 TempParamLists.get(), 9836 TempParamLists.size(), 9837 /*friend*/ true, 9838 isExplicitSpecialization, 9839 Invalid)) { 9840 if (TemplateParams->size() > 0) { 9841 // This is a declaration of a class template. 9842 if (Invalid) 9843 return 0; 9844 9845 return CheckClassTemplate(S, TagSpec, TUK_Friend, TagLoc, 9846 SS, Name, NameLoc, Attr, 9847 TemplateParams, AS_public, 9848 /*ModulePrivateLoc=*/SourceLocation(), 9849 TempParamLists.size() - 1, 9850 (TemplateParameterList**) TempParamLists.release()).take(); 9851 } else { 9852 // The "template<>" header is extraneous. 9853 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 9854 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 9855 isExplicitSpecialization = true; 9856 } 9857 } 9858 9859 if (Invalid) return 0; 9860 9861 bool isAllExplicitSpecializations = true; 9862 for (unsigned I = TempParamLists.size(); I-- > 0; ) { 9863 if (TempParamLists.get()[I]->size()) { 9864 isAllExplicitSpecializations = false; 9865 break; 9866 } 9867 } 9868 9869 // FIXME: don't ignore attributes. 9870 9871 // If it's explicit specializations all the way down, just forget 9872 // about the template header and build an appropriate non-templated 9873 // friend. TODO: for source fidelity, remember the headers. 9874 if (isAllExplicitSpecializations) { 9875 if (SS.isEmpty()) { 9876 bool Owned = false; 9877 bool IsDependent = false; 9878 return ActOnTag(S, TagSpec, TUK_Friend, TagLoc, SS, Name, NameLoc, 9879 Attr, AS_public, 9880 /*ModulePrivateLoc=*/SourceLocation(), 9881 MultiTemplateParamsArg(), Owned, IsDependent, 9882 /*ScopedEnumKWLoc=*/SourceLocation(), 9883 /*ScopedEnumUsesClassTag=*/false, 9884 /*UnderlyingType=*/TypeResult()); 9885 } 9886 9887 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 9888 ElaboratedTypeKeyword Keyword 9889 = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 9890 QualType T = CheckTypenameType(Keyword, TagLoc, QualifierLoc, 9891 *Name, NameLoc); 9892 if (T.isNull()) 9893 return 0; 9894 9895 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 9896 if (isa<DependentNameType>(T)) { 9897 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 9898 TL.setElaboratedKeywordLoc(TagLoc); 9899 TL.setQualifierLoc(QualifierLoc); 9900 TL.setNameLoc(NameLoc); 9901 } else { 9902 ElaboratedTypeLoc TL = cast<ElaboratedTypeLoc>(TSI->getTypeLoc()); 9903 TL.setElaboratedKeywordLoc(TagLoc); 9904 TL.setQualifierLoc(QualifierLoc); 9905 cast<TypeSpecTypeLoc>(TL.getNamedTypeLoc()).setNameLoc(NameLoc); 9906 } 9907 9908 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 9909 TSI, FriendLoc); 9910 Friend->setAccess(AS_public); 9911 CurContext->addDecl(Friend); 9912 return Friend; 9913 } 9914 9915 assert(SS.isNotEmpty() && "valid templated tag with no SS and no direct?"); 9916 9917 9918 9919 // Handle the case of a templated-scope friend class. e.g. 9920 // template <class T> class A<T>::B; 9921 // FIXME: we don't support these right now. 9922 ElaboratedTypeKeyword ETK = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 9923 QualType T = Context.getDependentNameType(ETK, SS.getScopeRep(), Name); 9924 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 9925 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 9926 TL.setElaboratedKeywordLoc(TagLoc); 9927 TL.setQualifierLoc(SS.getWithLocInContext(Context)); 9928 TL.setNameLoc(NameLoc); 9929 9930 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 9931 TSI, FriendLoc); 9932 Friend->setAccess(AS_public); 9933 Friend->setUnsupportedFriend(true); 9934 CurContext->addDecl(Friend); 9935 return Friend; 9936} 9937 9938 9939/// Handle a friend type declaration. This works in tandem with 9940/// ActOnTag. 9941/// 9942/// Notes on friend class templates: 9943/// 9944/// We generally treat friend class declarations as if they were 9945/// declaring a class. So, for example, the elaborated type specifier 9946/// in a friend declaration is required to obey the restrictions of a 9947/// class-head (i.e. no typedefs in the scope chain), template 9948/// parameters are required to match up with simple template-ids, &c. 9949/// However, unlike when declaring a template specialization, it's 9950/// okay to refer to a template specialization without an empty 9951/// template parameter declaration, e.g. 9952/// friend class A<T>::B<unsigned>; 9953/// We permit this as a special case; if there are any template 9954/// parameters present at all, require proper matching, i.e. 9955/// template <> template <class T> friend class A<int>::B; 9956Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 9957 MultiTemplateParamsArg TempParams) { 9958 SourceLocation Loc = DS.getLocStart(); 9959 9960 assert(DS.isFriendSpecified()); 9961 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 9962 9963 // Try to convert the decl specifier to a type. This works for 9964 // friend templates because ActOnTag never produces a ClassTemplateDecl 9965 // for a TUK_Friend. 9966 Declarator TheDeclarator(DS, Declarator::MemberContext); 9967 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 9968 QualType T = TSI->getType(); 9969 if (TheDeclarator.isInvalidType()) 9970 return 0; 9971 9972 if (DiagnoseUnexpandedParameterPack(Loc, TSI, UPPC_FriendDeclaration)) 9973 return 0; 9974 9975 // This is definitely an error in C++98. It's probably meant to 9976 // be forbidden in C++0x, too, but the specification is just 9977 // poorly written. 9978 // 9979 // The problem is with declarations like the following: 9980 // template <T> friend A<T>::foo; 9981 // where deciding whether a class C is a friend or not now hinges 9982 // on whether there exists an instantiation of A that causes 9983 // 'foo' to equal C. There are restrictions on class-heads 9984 // (which we declare (by fiat) elaborated friend declarations to 9985 // be) that makes this tractable. 9986 // 9987 // FIXME: handle "template <> friend class A<T>;", which 9988 // is possibly well-formed? Who even knows? 9989 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 9990 Diag(Loc, diag::err_tagless_friend_type_template) 9991 << DS.getSourceRange(); 9992 return 0; 9993 } 9994 9995 // C++98 [class.friend]p1: A friend of a class is a function 9996 // or class that is not a member of the class . . . 9997 // This is fixed in DR77, which just barely didn't make the C++03 9998 // deadline. It's also a very silly restriction that seriously 9999 // affects inner classes and which nobody else seems to implement; 10000 // thus we never diagnose it, not even in -pedantic. 10001 // 10002 // But note that we could warn about it: it's always useless to 10003 // friend one of your own members (it's not, however, worthless to 10004 // friend a member of an arbitrary specialization of your template). 10005 10006 Decl *D; 10007 if (unsigned NumTempParamLists = TempParams.size()) 10008 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 10009 NumTempParamLists, 10010 TempParams.release(), 10011 TSI, 10012 DS.getFriendSpecLoc()); 10013 else 10014 D = CheckFriendTypeDecl(Loc, DS.getFriendSpecLoc(), TSI); 10015 10016 if (!D) 10017 return 0; 10018 10019 D->setAccess(AS_public); 10020 CurContext->addDecl(D); 10021 10022 return D; 10023} 10024 10025Decl *Sema::ActOnFriendFunctionDecl(Scope *S, Declarator &D, 10026 MultiTemplateParamsArg TemplateParams) { 10027 const DeclSpec &DS = D.getDeclSpec(); 10028 10029 assert(DS.isFriendSpecified()); 10030 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 10031 10032 SourceLocation Loc = D.getIdentifierLoc(); 10033 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 10034 10035 // C++ [class.friend]p1 10036 // A friend of a class is a function or class.... 10037 // Note that this sees through typedefs, which is intended. 10038 // It *doesn't* see through dependent types, which is correct 10039 // according to [temp.arg.type]p3: 10040 // If a declaration acquires a function type through a 10041 // type dependent on a template-parameter and this causes 10042 // a declaration that does not use the syntactic form of a 10043 // function declarator to have a function type, the program 10044 // is ill-formed. 10045 if (!TInfo->getType()->isFunctionType()) { 10046 Diag(Loc, diag::err_unexpected_friend); 10047 10048 // It might be worthwhile to try to recover by creating an 10049 // appropriate declaration. 10050 return 0; 10051 } 10052 10053 // C++ [namespace.memdef]p3 10054 // - If a friend declaration in a non-local class first declares a 10055 // class or function, the friend class or function is a member 10056 // of the innermost enclosing namespace. 10057 // - The name of the friend is not found by simple name lookup 10058 // until a matching declaration is provided in that namespace 10059 // scope (either before or after the class declaration granting 10060 // friendship). 10061 // - If a friend function is called, its name may be found by the 10062 // name lookup that considers functions from namespaces and 10063 // classes associated with the types of the function arguments. 10064 // - When looking for a prior declaration of a class or a function 10065 // declared as a friend, scopes outside the innermost enclosing 10066 // namespace scope are not considered. 10067 10068 CXXScopeSpec &SS = D.getCXXScopeSpec(); 10069 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 10070 DeclarationName Name = NameInfo.getName(); 10071 assert(Name); 10072 10073 // Check for unexpanded parameter packs. 10074 if (DiagnoseUnexpandedParameterPack(Loc, TInfo, UPPC_FriendDeclaration) || 10075 DiagnoseUnexpandedParameterPack(NameInfo, UPPC_FriendDeclaration) || 10076 DiagnoseUnexpandedParameterPack(SS, UPPC_FriendDeclaration)) 10077 return 0; 10078 10079 // The context we found the declaration in, or in which we should 10080 // create the declaration. 10081 DeclContext *DC; 10082 Scope *DCScope = S; 10083 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 10084 ForRedeclaration); 10085 10086 // FIXME: there are different rules in local classes 10087 10088 // There are four cases here. 10089 // - There's no scope specifier, in which case we just go to the 10090 // appropriate scope and look for a function or function template 10091 // there as appropriate. 10092 // Recover from invalid scope qualifiers as if they just weren't there. 10093 if (SS.isInvalid() || !SS.isSet()) { 10094 // C++0x [namespace.memdef]p3: 10095 // If the name in a friend declaration is neither qualified nor 10096 // a template-id and the declaration is a function or an 10097 // elaborated-type-specifier, the lookup to determine whether 10098 // the entity has been previously declared shall not consider 10099 // any scopes outside the innermost enclosing namespace. 10100 // C++0x [class.friend]p11: 10101 // If a friend declaration appears in a local class and the name 10102 // specified is an unqualified name, a prior declaration is 10103 // looked up without considering scopes that are outside the 10104 // innermost enclosing non-class scope. For a friend function 10105 // declaration, if there is no prior declaration, the program is 10106 // ill-formed. 10107 bool isLocal = cast<CXXRecordDecl>(CurContext)->isLocalClass(); 10108 bool isTemplateId = D.getName().getKind() == UnqualifiedId::IK_TemplateId; 10109 10110 // Find the appropriate context according to the above. 10111 DC = CurContext; 10112 while (true) { 10113 // Skip class contexts. If someone can cite chapter and verse 10114 // for this behavior, that would be nice --- it's what GCC and 10115 // EDG do, and it seems like a reasonable intent, but the spec 10116 // really only says that checks for unqualified existing 10117 // declarations should stop at the nearest enclosing namespace, 10118 // not that they should only consider the nearest enclosing 10119 // namespace. 10120 while (DC->isRecord() || DC->isTransparentContext()) 10121 DC = DC->getParent(); 10122 10123 LookupQualifiedName(Previous, DC); 10124 10125 // TODO: decide what we think about using declarations. 10126 if (isLocal || !Previous.empty()) 10127 break; 10128 10129 if (isTemplateId) { 10130 if (isa<TranslationUnitDecl>(DC)) break; 10131 } else { 10132 if (DC->isFileContext()) break; 10133 } 10134 DC = DC->getParent(); 10135 } 10136 10137 // C++ [class.friend]p1: A friend of a class is a function or 10138 // class that is not a member of the class . . . 10139 // C++11 changes this for both friend types and functions. 10140 // Most C++ 98 compilers do seem to give an error here, so 10141 // we do, too. 10142 if (!Previous.empty() && DC->Equals(CurContext)) 10143 Diag(DS.getFriendSpecLoc(), 10144 getLangOpts().CPlusPlus0x ? 10145 diag::warn_cxx98_compat_friend_is_member : 10146 diag::err_friend_is_member); 10147 10148 DCScope = getScopeForDeclContext(S, DC); 10149 10150 // C++ [class.friend]p6: 10151 // A function can be defined in a friend declaration of a class if and 10152 // only if the class is a non-local class (9.8), the function name is 10153 // unqualified, and the function has namespace scope. 10154 if (isLocal && D.isFunctionDefinition()) { 10155 Diag(NameInfo.getBeginLoc(), diag::err_friend_def_in_local_class); 10156 } 10157 10158 // - There's a non-dependent scope specifier, in which case we 10159 // compute it and do a previous lookup there for a function 10160 // or function template. 10161 } else if (!SS.getScopeRep()->isDependent()) { 10162 DC = computeDeclContext(SS); 10163 if (!DC) return 0; 10164 10165 if (RequireCompleteDeclContext(SS, DC)) return 0; 10166 10167 LookupQualifiedName(Previous, DC); 10168 10169 // Ignore things found implicitly in the wrong scope. 10170 // TODO: better diagnostics for this case. Suggesting the right 10171 // qualified scope would be nice... 10172 LookupResult::Filter F = Previous.makeFilter(); 10173 while (F.hasNext()) { 10174 NamedDecl *D = F.next(); 10175 if (!DC->InEnclosingNamespaceSetOf( 10176 D->getDeclContext()->getRedeclContext())) 10177 F.erase(); 10178 } 10179 F.done(); 10180 10181 if (Previous.empty()) { 10182 D.setInvalidType(); 10183 Diag(Loc, diag::err_qualified_friend_not_found) 10184 << Name << TInfo->getType(); 10185 return 0; 10186 } 10187 10188 // C++ [class.friend]p1: A friend of a class is a function or 10189 // class that is not a member of the class . . . 10190 if (DC->Equals(CurContext)) 10191 Diag(DS.getFriendSpecLoc(), 10192 getLangOpts().CPlusPlus0x ? 10193 diag::warn_cxx98_compat_friend_is_member : 10194 diag::err_friend_is_member); 10195 10196 if (D.isFunctionDefinition()) { 10197 // C++ [class.friend]p6: 10198 // A function can be defined in a friend declaration of a class if and 10199 // only if the class is a non-local class (9.8), the function name is 10200 // unqualified, and the function has namespace scope. 10201 SemaDiagnosticBuilder DB 10202 = Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def); 10203 10204 DB << SS.getScopeRep(); 10205 if (DC->isFileContext()) 10206 DB << FixItHint::CreateRemoval(SS.getRange()); 10207 SS.clear(); 10208 } 10209 10210 // - There's a scope specifier that does not match any template 10211 // parameter lists, in which case we use some arbitrary context, 10212 // create a method or method template, and wait for instantiation. 10213 // - There's a scope specifier that does match some template 10214 // parameter lists, which we don't handle right now. 10215 } else { 10216 if (D.isFunctionDefinition()) { 10217 // C++ [class.friend]p6: 10218 // A function can be defined in a friend declaration of a class if and 10219 // only if the class is a non-local class (9.8), the function name is 10220 // unqualified, and the function has namespace scope. 10221 Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def) 10222 << SS.getScopeRep(); 10223 } 10224 10225 DC = CurContext; 10226 assert(isa<CXXRecordDecl>(DC) && "friend declaration not in class?"); 10227 } 10228 10229 if (!DC->isRecord()) { 10230 // This implies that it has to be an operator or function. 10231 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 10232 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 10233 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 10234 Diag(Loc, diag::err_introducing_special_friend) << 10235 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 10236 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 10237 return 0; 10238 } 10239 } 10240 10241 // FIXME: This is an egregious hack to cope with cases where the scope stack 10242 // does not contain the declaration context, i.e., in an out-of-line 10243 // definition of a class. 10244 Scope FakeDCScope(S, Scope::DeclScope, Diags); 10245 if (!DCScope) { 10246 FakeDCScope.setEntity(DC); 10247 DCScope = &FakeDCScope; 10248 } 10249 10250 bool AddToScope = true; 10251 NamedDecl *ND = ActOnFunctionDeclarator(DCScope, D, DC, TInfo, Previous, 10252 move(TemplateParams), AddToScope); 10253 if (!ND) return 0; 10254 10255 assert(ND->getDeclContext() == DC); 10256 assert(ND->getLexicalDeclContext() == CurContext); 10257 10258 // Add the function declaration to the appropriate lookup tables, 10259 // adjusting the redeclarations list as necessary. We don't 10260 // want to do this yet if the friending class is dependent. 10261 // 10262 // Also update the scope-based lookup if the target context's 10263 // lookup context is in lexical scope. 10264 if (!CurContext->isDependentContext()) { 10265 DC = DC->getRedeclContext(); 10266 DC->makeDeclVisibleInContext(ND); 10267 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 10268 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 10269 } 10270 10271 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 10272 D.getIdentifierLoc(), ND, 10273 DS.getFriendSpecLoc()); 10274 FrD->setAccess(AS_public); 10275 CurContext->addDecl(FrD); 10276 10277 if (ND->isInvalidDecl()) 10278 FrD->setInvalidDecl(); 10279 else { 10280 FunctionDecl *FD; 10281 if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(ND)) 10282 FD = FTD->getTemplatedDecl(); 10283 else 10284 FD = cast<FunctionDecl>(ND); 10285 10286 // Mark templated-scope function declarations as unsupported. 10287 if (FD->getNumTemplateParameterLists()) 10288 FrD->setUnsupportedFriend(true); 10289 } 10290 10291 return ND; 10292} 10293 10294void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) { 10295 AdjustDeclIfTemplate(Dcl); 10296 10297 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 10298 if (!Fn) { 10299 Diag(DelLoc, diag::err_deleted_non_function); 10300 return; 10301 } 10302 if (const FunctionDecl *Prev = Fn->getPreviousDecl()) { 10303 Diag(DelLoc, diag::err_deleted_decl_not_first); 10304 Diag(Prev->getLocation(), diag::note_previous_declaration); 10305 // If the declaration wasn't the first, we delete the function anyway for 10306 // recovery. 10307 } 10308 Fn->setDeletedAsWritten(); 10309 10310 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Dcl); 10311 if (!MD) 10312 return; 10313 10314 // A deleted special member function is trivial if the corresponding 10315 // implicitly-declared function would have been. 10316 switch (getSpecialMember(MD)) { 10317 case CXXInvalid: 10318 break; 10319 case CXXDefaultConstructor: 10320 MD->setTrivial(MD->getParent()->hasTrivialDefaultConstructor()); 10321 break; 10322 case CXXCopyConstructor: 10323 MD->setTrivial(MD->getParent()->hasTrivialCopyConstructor()); 10324 break; 10325 case CXXMoveConstructor: 10326 MD->setTrivial(MD->getParent()->hasTrivialMoveConstructor()); 10327 break; 10328 case CXXCopyAssignment: 10329 MD->setTrivial(MD->getParent()->hasTrivialCopyAssignment()); 10330 break; 10331 case CXXMoveAssignment: 10332 MD->setTrivial(MD->getParent()->hasTrivialMoveAssignment()); 10333 break; 10334 case CXXDestructor: 10335 MD->setTrivial(MD->getParent()->hasTrivialDestructor()); 10336 break; 10337 } 10338} 10339 10340void Sema::SetDeclDefaulted(Decl *Dcl, SourceLocation DefaultLoc) { 10341 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Dcl); 10342 10343 if (MD) { 10344 if (MD->getParent()->isDependentType()) { 10345 MD->setDefaulted(); 10346 MD->setExplicitlyDefaulted(); 10347 return; 10348 } 10349 10350 CXXSpecialMember Member = getSpecialMember(MD); 10351 if (Member == CXXInvalid) { 10352 Diag(DefaultLoc, diag::err_default_special_members); 10353 return; 10354 } 10355 10356 MD->setDefaulted(); 10357 MD->setExplicitlyDefaulted(); 10358 10359 // If this definition appears within the record, do the checking when 10360 // the record is complete. 10361 const FunctionDecl *Primary = MD; 10362 if (MD->getTemplatedKind() != FunctionDecl::TK_NonTemplate) 10363 // Find the uninstantiated declaration that actually had the '= default' 10364 // on it. 10365 MD->getTemplateInstantiationPattern()->isDefined(Primary); 10366 10367 if (Primary == Primary->getCanonicalDecl()) 10368 return; 10369 10370 switch (Member) { 10371 case CXXDefaultConstructor: { 10372 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10373 CheckExplicitlyDefaultedSpecialMember(CD); 10374 if (!CD->isInvalidDecl()) 10375 DefineImplicitDefaultConstructor(DefaultLoc, CD); 10376 break; 10377 } 10378 10379 case CXXCopyConstructor: { 10380 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10381 CheckExplicitlyDefaultedSpecialMember(CD); 10382 if (!CD->isInvalidDecl()) 10383 DefineImplicitCopyConstructor(DefaultLoc, CD); 10384 break; 10385 } 10386 10387 case CXXCopyAssignment: { 10388 CheckExplicitlyDefaultedSpecialMember(MD); 10389 if (!MD->isInvalidDecl()) 10390 DefineImplicitCopyAssignment(DefaultLoc, MD); 10391 break; 10392 } 10393 10394 case CXXDestructor: { 10395 CXXDestructorDecl *DD = cast<CXXDestructorDecl>(MD); 10396 CheckExplicitlyDefaultedSpecialMember(DD); 10397 if (!DD->isInvalidDecl()) 10398 DefineImplicitDestructor(DefaultLoc, DD); 10399 break; 10400 } 10401 10402 case CXXMoveConstructor: { 10403 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10404 CheckExplicitlyDefaultedSpecialMember(CD); 10405 if (!CD->isInvalidDecl()) 10406 DefineImplicitMoveConstructor(DefaultLoc, CD); 10407 break; 10408 } 10409 10410 case CXXMoveAssignment: { 10411 CheckExplicitlyDefaultedSpecialMember(MD); 10412 if (!MD->isInvalidDecl()) 10413 DefineImplicitMoveAssignment(DefaultLoc, MD); 10414 break; 10415 } 10416 10417 case CXXInvalid: 10418 llvm_unreachable("Invalid special member."); 10419 } 10420 } else { 10421 Diag(DefaultLoc, diag::err_default_special_members); 10422 } 10423} 10424 10425static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 10426 for (Stmt::child_range CI = S->children(); CI; ++CI) { 10427 Stmt *SubStmt = *CI; 10428 if (!SubStmt) 10429 continue; 10430 if (isa<ReturnStmt>(SubStmt)) 10431 Self.Diag(SubStmt->getLocStart(), 10432 diag::err_return_in_constructor_handler); 10433 if (!isa<Expr>(SubStmt)) 10434 SearchForReturnInStmt(Self, SubStmt); 10435 } 10436} 10437 10438void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 10439 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 10440 CXXCatchStmt *Handler = TryBlock->getHandler(I); 10441 SearchForReturnInStmt(*this, Handler); 10442 } 10443} 10444 10445bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 10446 const CXXMethodDecl *Old) { 10447 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 10448 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 10449 10450 if (Context.hasSameType(NewTy, OldTy) || 10451 NewTy->isDependentType() || OldTy->isDependentType()) 10452 return false; 10453 10454 // Check if the return types are covariant 10455 QualType NewClassTy, OldClassTy; 10456 10457 /// Both types must be pointers or references to classes. 10458 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 10459 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 10460 NewClassTy = NewPT->getPointeeType(); 10461 OldClassTy = OldPT->getPointeeType(); 10462 } 10463 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 10464 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 10465 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 10466 NewClassTy = NewRT->getPointeeType(); 10467 OldClassTy = OldRT->getPointeeType(); 10468 } 10469 } 10470 } 10471 10472 // The return types aren't either both pointers or references to a class type. 10473 if (NewClassTy.isNull()) { 10474 Diag(New->getLocation(), 10475 diag::err_different_return_type_for_overriding_virtual_function) 10476 << New->getDeclName() << NewTy << OldTy; 10477 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10478 10479 return true; 10480 } 10481 10482 // C++ [class.virtual]p6: 10483 // If the return type of D::f differs from the return type of B::f, the 10484 // class type in the return type of D::f shall be complete at the point of 10485 // declaration of D::f or shall be the class type D. 10486 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 10487 if (!RT->isBeingDefined() && 10488 RequireCompleteType(New->getLocation(), NewClassTy, 10489 diag::err_covariant_return_incomplete, 10490 New->getDeclName())) 10491 return true; 10492 } 10493 10494 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 10495 // Check if the new class derives from the old class. 10496 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 10497 Diag(New->getLocation(), 10498 diag::err_covariant_return_not_derived) 10499 << New->getDeclName() << NewTy << OldTy; 10500 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10501 return true; 10502 } 10503 10504 // Check if we the conversion from derived to base is valid. 10505 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 10506 diag::err_covariant_return_inaccessible_base, 10507 diag::err_covariant_return_ambiguous_derived_to_base_conv, 10508 // FIXME: Should this point to the return type? 10509 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 10510 // FIXME: this note won't trigger for delayed access control 10511 // diagnostics, and it's impossible to get an undelayed error 10512 // here from access control during the original parse because 10513 // the ParsingDeclSpec/ParsingDeclarator are still in scope. 10514 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10515 return true; 10516 } 10517 } 10518 10519 // The qualifiers of the return types must be the same. 10520 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 10521 Diag(New->getLocation(), 10522 diag::err_covariant_return_type_different_qualifications) 10523 << New->getDeclName() << NewTy << OldTy; 10524 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10525 return true; 10526 }; 10527 10528 10529 // The new class type must have the same or less qualifiers as the old type. 10530 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 10531 Diag(New->getLocation(), 10532 diag::err_covariant_return_type_class_type_more_qualified) 10533 << New->getDeclName() << NewTy << OldTy; 10534 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10535 return true; 10536 }; 10537 10538 return false; 10539} 10540 10541/// \brief Mark the given method pure. 10542/// 10543/// \param Method the method to be marked pure. 10544/// 10545/// \param InitRange the source range that covers the "0" initializer. 10546bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 10547 SourceLocation EndLoc = InitRange.getEnd(); 10548 if (EndLoc.isValid()) 10549 Method->setRangeEnd(EndLoc); 10550 10551 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 10552 Method->setPure(); 10553 return false; 10554 } 10555 10556 if (!Method->isInvalidDecl()) 10557 Diag(Method->getLocation(), diag::err_non_virtual_pure) 10558 << Method->getDeclName() << InitRange; 10559 return true; 10560} 10561 10562/// \brief Determine whether the given declaration is a static data member. 10563static bool isStaticDataMember(Decl *D) { 10564 VarDecl *Var = dyn_cast_or_null<VarDecl>(D); 10565 if (!Var) 10566 return false; 10567 10568 return Var->isStaticDataMember(); 10569} 10570/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 10571/// an initializer for the out-of-line declaration 'Dcl'. The scope 10572/// is a fresh scope pushed for just this purpose. 10573/// 10574/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 10575/// static data member of class X, names should be looked up in the scope of 10576/// class X. 10577void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) { 10578 // If there is no declaration, there was an error parsing it. 10579 if (D == 0 || D->isInvalidDecl()) return; 10580 10581 // We should only get called for declarations with scope specifiers, like: 10582 // int foo::bar; 10583 assert(D->isOutOfLine()); 10584 EnterDeclaratorContext(S, D->getDeclContext()); 10585 10586 // If we are parsing the initializer for a static data member, push a 10587 // new expression evaluation context that is associated with this static 10588 // data member. 10589 if (isStaticDataMember(D)) 10590 PushExpressionEvaluationContext(PotentiallyEvaluated, D); 10591} 10592 10593/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 10594/// initializer for the out-of-line declaration 'D'. 10595void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) { 10596 // If there is no declaration, there was an error parsing it. 10597 if (D == 0 || D->isInvalidDecl()) return; 10598 10599 if (isStaticDataMember(D)) 10600 PopExpressionEvaluationContext(); 10601 10602 assert(D->isOutOfLine()); 10603 ExitDeclaratorContext(S); 10604} 10605 10606/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 10607/// C++ if/switch/while/for statement. 10608/// e.g: "if (int x = f()) {...}" 10609DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 10610 // C++ 6.4p2: 10611 // The declarator shall not specify a function or an array. 10612 // The type-specifier-seq shall not contain typedef and shall not declare a 10613 // new class or enumeration. 10614 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 10615 "Parser allowed 'typedef' as storage class of condition decl."); 10616 10617 Decl *Dcl = ActOnDeclarator(S, D); 10618 if (!Dcl) 10619 return true; 10620 10621 if (isa<FunctionDecl>(Dcl)) { // The declarator shall not specify a function. 10622 Diag(Dcl->getLocation(), diag::err_invalid_use_of_function_type) 10623 << D.getSourceRange(); 10624 return true; 10625 } 10626 10627 return Dcl; 10628} 10629 10630void Sema::LoadExternalVTableUses() { 10631 if (!ExternalSource) 10632 return; 10633 10634 SmallVector<ExternalVTableUse, 4> VTables; 10635 ExternalSource->ReadUsedVTables(VTables); 10636 SmallVector<VTableUse, 4> NewUses; 10637 for (unsigned I = 0, N = VTables.size(); I != N; ++I) { 10638 llvm::DenseMap<CXXRecordDecl *, bool>::iterator Pos 10639 = VTablesUsed.find(VTables[I].Record); 10640 // Even if a definition wasn't required before, it may be required now. 10641 if (Pos != VTablesUsed.end()) { 10642 if (!Pos->second && VTables[I].DefinitionRequired) 10643 Pos->second = true; 10644 continue; 10645 } 10646 10647 VTablesUsed[VTables[I].Record] = VTables[I].DefinitionRequired; 10648 NewUses.push_back(VTableUse(VTables[I].Record, VTables[I].Location)); 10649 } 10650 10651 VTableUses.insert(VTableUses.begin(), NewUses.begin(), NewUses.end()); 10652} 10653 10654void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 10655 bool DefinitionRequired) { 10656 // Ignore any vtable uses in unevaluated operands or for classes that do 10657 // not have a vtable. 10658 if (!Class->isDynamicClass() || Class->isDependentContext() || 10659 CurContext->isDependentContext() || 10660 ExprEvalContexts.back().Context == Unevaluated) 10661 return; 10662 10663 // Try to insert this class into the map. 10664 LoadExternalVTableUses(); 10665 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 10666 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 10667 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 10668 if (!Pos.second) { 10669 // If we already had an entry, check to see if we are promoting this vtable 10670 // to required a definition. If so, we need to reappend to the VTableUses 10671 // list, since we may have already processed the first entry. 10672 if (DefinitionRequired && !Pos.first->second) { 10673 Pos.first->second = true; 10674 } else { 10675 // Otherwise, we can early exit. 10676 return; 10677 } 10678 } 10679 10680 // Local classes need to have their virtual members marked 10681 // immediately. For all other classes, we mark their virtual members 10682 // at the end of the translation unit. 10683 if (Class->isLocalClass()) 10684 MarkVirtualMembersReferenced(Loc, Class); 10685 else 10686 VTableUses.push_back(std::make_pair(Class, Loc)); 10687} 10688 10689bool Sema::DefineUsedVTables() { 10690 LoadExternalVTableUses(); 10691 if (VTableUses.empty()) 10692 return false; 10693 10694 // Note: The VTableUses vector could grow as a result of marking 10695 // the members of a class as "used", so we check the size each 10696 // time through the loop and prefer indices (with are stable) to 10697 // iterators (which are not). 10698 bool DefinedAnything = false; 10699 for (unsigned I = 0; I != VTableUses.size(); ++I) { 10700 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 10701 if (!Class) 10702 continue; 10703 10704 SourceLocation Loc = VTableUses[I].second; 10705 10706 // If this class has a key function, but that key function is 10707 // defined in another translation unit, we don't need to emit the 10708 // vtable even though we're using it. 10709 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class); 10710 if (KeyFunction && !KeyFunction->hasBody()) { 10711 switch (KeyFunction->getTemplateSpecializationKind()) { 10712 case TSK_Undeclared: 10713 case TSK_ExplicitSpecialization: 10714 case TSK_ExplicitInstantiationDeclaration: 10715 // The key function is in another translation unit. 10716 continue; 10717 10718 case TSK_ExplicitInstantiationDefinition: 10719 case TSK_ImplicitInstantiation: 10720 // We will be instantiating the key function. 10721 break; 10722 } 10723 } else if (!KeyFunction) { 10724 // If we have a class with no key function that is the subject 10725 // of an explicit instantiation declaration, suppress the 10726 // vtable; it will live with the explicit instantiation 10727 // definition. 10728 bool IsExplicitInstantiationDeclaration 10729 = Class->getTemplateSpecializationKind() 10730 == TSK_ExplicitInstantiationDeclaration; 10731 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 10732 REnd = Class->redecls_end(); 10733 R != REnd; ++R) { 10734 TemplateSpecializationKind TSK 10735 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 10736 if (TSK == TSK_ExplicitInstantiationDeclaration) 10737 IsExplicitInstantiationDeclaration = true; 10738 else if (TSK == TSK_ExplicitInstantiationDefinition) { 10739 IsExplicitInstantiationDeclaration = false; 10740 break; 10741 } 10742 } 10743 10744 if (IsExplicitInstantiationDeclaration) 10745 continue; 10746 } 10747 10748 // Mark all of the virtual members of this class as referenced, so 10749 // that we can build a vtable. Then, tell the AST consumer that a 10750 // vtable for this class is required. 10751 DefinedAnything = true; 10752 MarkVirtualMembersReferenced(Loc, Class); 10753 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 10754 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 10755 10756 // Optionally warn if we're emitting a weak vtable. 10757 if (Class->getLinkage() == ExternalLinkage && 10758 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 10759 const FunctionDecl *KeyFunctionDef = 0; 10760 if (!KeyFunction || 10761 (KeyFunction->hasBody(KeyFunctionDef) && 10762 KeyFunctionDef->isInlined())) 10763 Diag(Class->getLocation(), Class->getTemplateSpecializationKind() == 10764 TSK_ExplicitInstantiationDefinition 10765 ? diag::warn_weak_template_vtable : diag::warn_weak_vtable) 10766 << Class; 10767 } 10768 } 10769 VTableUses.clear(); 10770 10771 return DefinedAnything; 10772} 10773 10774void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 10775 const CXXRecordDecl *RD) { 10776 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 10777 e = RD->method_end(); i != e; ++i) { 10778 CXXMethodDecl *MD = *i; 10779 10780 // C++ [basic.def.odr]p2: 10781 // [...] A virtual member function is used if it is not pure. [...] 10782 if (MD->isVirtual() && !MD->isPure()) 10783 MarkFunctionReferenced(Loc, MD); 10784 } 10785 10786 // Only classes that have virtual bases need a VTT. 10787 if (RD->getNumVBases() == 0) 10788 return; 10789 10790 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 10791 e = RD->bases_end(); i != e; ++i) { 10792 const CXXRecordDecl *Base = 10793 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 10794 if (Base->getNumVBases() == 0) 10795 continue; 10796 MarkVirtualMembersReferenced(Loc, Base); 10797 } 10798} 10799 10800/// SetIvarInitializers - This routine builds initialization ASTs for the 10801/// Objective-C implementation whose ivars need be initialized. 10802void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 10803 if (!getLangOpts().CPlusPlus) 10804 return; 10805 if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 10806 SmallVector<ObjCIvarDecl*, 8> ivars; 10807 CollectIvarsToConstructOrDestruct(OID, ivars); 10808 if (ivars.empty()) 10809 return; 10810 SmallVector<CXXCtorInitializer*, 32> AllToInit; 10811 for (unsigned i = 0; i < ivars.size(); i++) { 10812 FieldDecl *Field = ivars[i]; 10813 if (Field->isInvalidDecl()) 10814 continue; 10815 10816 CXXCtorInitializer *Member; 10817 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 10818 InitializationKind InitKind = 10819 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 10820 10821 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 10822 ExprResult MemberInit = 10823 InitSeq.Perform(*this, InitEntity, InitKind, MultiExprArg()); 10824 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 10825 // Note, MemberInit could actually come back empty if no initialization 10826 // is required (e.g., because it would call a trivial default constructor) 10827 if (!MemberInit.get() || MemberInit.isInvalid()) 10828 continue; 10829 10830 Member = 10831 new (Context) CXXCtorInitializer(Context, Field, SourceLocation(), 10832 SourceLocation(), 10833 MemberInit.takeAs<Expr>(), 10834 SourceLocation()); 10835 AllToInit.push_back(Member); 10836 10837 // Be sure that the destructor is accessible and is marked as referenced. 10838 if (const RecordType *RecordTy 10839 = Context.getBaseElementType(Field->getType()) 10840 ->getAs<RecordType>()) { 10841 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 10842 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 10843 MarkFunctionReferenced(Field->getLocation(), Destructor); 10844 CheckDestructorAccess(Field->getLocation(), Destructor, 10845 PDiag(diag::err_access_dtor_ivar) 10846 << Context.getBaseElementType(Field->getType())); 10847 } 10848 } 10849 } 10850 ObjCImplementation->setIvarInitializers(Context, 10851 AllToInit.data(), AllToInit.size()); 10852 } 10853} 10854 10855static 10856void DelegatingCycleHelper(CXXConstructorDecl* Ctor, 10857 llvm::SmallSet<CXXConstructorDecl*, 4> &Valid, 10858 llvm::SmallSet<CXXConstructorDecl*, 4> &Invalid, 10859 llvm::SmallSet<CXXConstructorDecl*, 4> &Current, 10860 Sema &S) { 10861 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 10862 CE = Current.end(); 10863 if (Ctor->isInvalidDecl()) 10864 return; 10865 10866 const FunctionDecl *FNTarget = 0; 10867 CXXConstructorDecl *Target; 10868 10869 // We ignore the result here since if we don't have a body, Target will be 10870 // null below. 10871 (void)Ctor->getTargetConstructor()->hasBody(FNTarget); 10872 Target 10873= const_cast<CXXConstructorDecl*>(cast_or_null<CXXConstructorDecl>(FNTarget)); 10874 10875 CXXConstructorDecl *Canonical = Ctor->getCanonicalDecl(), 10876 // Avoid dereferencing a null pointer here. 10877 *TCanonical = Target ? Target->getCanonicalDecl() : 0; 10878 10879 if (!Current.insert(Canonical)) 10880 return; 10881 10882 // We know that beyond here, we aren't chaining into a cycle. 10883 if (!Target || !Target->isDelegatingConstructor() || 10884 Target->isInvalidDecl() || Valid.count(TCanonical)) { 10885 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 10886 Valid.insert(*CI); 10887 Current.clear(); 10888 // We've hit a cycle. 10889 } else if (TCanonical == Canonical || Invalid.count(TCanonical) || 10890 Current.count(TCanonical)) { 10891 // If we haven't diagnosed this cycle yet, do so now. 10892 if (!Invalid.count(TCanonical)) { 10893 S.Diag((*Ctor->init_begin())->getSourceLocation(), 10894 diag::warn_delegating_ctor_cycle) 10895 << Ctor; 10896 10897 // Don't add a note for a function delegating directo to itself. 10898 if (TCanonical != Canonical) 10899 S.Diag(Target->getLocation(), diag::note_it_delegates_to); 10900 10901 CXXConstructorDecl *C = Target; 10902 while (C->getCanonicalDecl() != Canonical) { 10903 (void)C->getTargetConstructor()->hasBody(FNTarget); 10904 assert(FNTarget && "Ctor cycle through bodiless function"); 10905 10906 C 10907 = const_cast<CXXConstructorDecl*>(cast<CXXConstructorDecl>(FNTarget)); 10908 S.Diag(C->getLocation(), diag::note_which_delegates_to); 10909 } 10910 } 10911 10912 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 10913 Invalid.insert(*CI); 10914 Current.clear(); 10915 } else { 10916 DelegatingCycleHelper(Target, Valid, Invalid, Current, S); 10917 } 10918} 10919 10920 10921void Sema::CheckDelegatingCtorCycles() { 10922 llvm::SmallSet<CXXConstructorDecl*, 4> Valid, Invalid, Current; 10923 10924 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 10925 CE = Current.end(); 10926 10927 for (DelegatingCtorDeclsType::iterator 10928 I = DelegatingCtorDecls.begin(ExternalSource), 10929 E = DelegatingCtorDecls.end(); 10930 I != E; ++I) { 10931 DelegatingCycleHelper(*I, Valid, Invalid, Current, *this); 10932 } 10933 10934 for (CI = Invalid.begin(), CE = Invalid.end(); CI != CE; ++CI) 10935 (*CI)->setInvalidDecl(); 10936} 10937 10938namespace { 10939 /// \brief AST visitor that finds references to the 'this' expression. 10940 class FindCXXThisExpr : public RecursiveASTVisitor<FindCXXThisExpr> { 10941 Sema &S; 10942 10943 public: 10944 explicit FindCXXThisExpr(Sema &S) : S(S) { } 10945 10946 bool VisitCXXThisExpr(CXXThisExpr *E) { 10947 S.Diag(E->getLocation(), diag::err_this_static_member_func) 10948 << E->isImplicit(); 10949 return false; 10950 } 10951 }; 10952} 10953 10954bool Sema::checkThisInStaticMemberFunctionType(CXXMethodDecl *Method) { 10955 TypeSourceInfo *TSInfo = Method->getTypeSourceInfo(); 10956 if (!TSInfo) 10957 return false; 10958 10959 TypeLoc TL = TSInfo->getTypeLoc(); 10960 FunctionProtoTypeLoc *ProtoTL = dyn_cast<FunctionProtoTypeLoc>(&TL); 10961 if (!ProtoTL) 10962 return false; 10963 10964 // C++11 [expr.prim.general]p3: 10965 // [The expression this] shall not appear before the optional 10966 // cv-qualifier-seq and it shall not appear within the declaration of a 10967 // static member function (although its type and value category are defined 10968 // within a static member function as they are within a non-static member 10969 // function). [ Note: this is because declaration matching does not occur 10970 // until the complete declarator is known. - end note ] 10971 const FunctionProtoType *Proto = ProtoTL->getTypePtr(); 10972 FindCXXThisExpr Finder(*this); 10973 10974 // If the return type came after the cv-qualifier-seq, check it now. 10975 if (Proto->hasTrailingReturn() && 10976 !Finder.TraverseTypeLoc(ProtoTL->getResultLoc())) 10977 return true; 10978 10979 // Check the exception specification. 10980 if (checkThisInStaticMemberFunctionExceptionSpec(Method)) 10981 return true; 10982 10983 return checkThisInStaticMemberFunctionAttributes(Method); 10984} 10985 10986bool Sema::checkThisInStaticMemberFunctionExceptionSpec(CXXMethodDecl *Method) { 10987 TypeSourceInfo *TSInfo = Method->getTypeSourceInfo(); 10988 if (!TSInfo) 10989 return false; 10990 10991 TypeLoc TL = TSInfo->getTypeLoc(); 10992 FunctionProtoTypeLoc *ProtoTL = dyn_cast<FunctionProtoTypeLoc>(&TL); 10993 if (!ProtoTL) 10994 return false; 10995 10996 const FunctionProtoType *Proto = ProtoTL->getTypePtr(); 10997 FindCXXThisExpr Finder(*this); 10998 10999 switch (Proto->getExceptionSpecType()) { 11000 case EST_Uninstantiated: 11001 case EST_BasicNoexcept: 11002 case EST_Delayed: 11003 case EST_DynamicNone: 11004 case EST_MSAny: 11005 case EST_None: 11006 break; 11007 11008 case EST_ComputedNoexcept: 11009 if (!Finder.TraverseStmt(Proto->getNoexceptExpr())) 11010 return true; 11011 11012 case EST_Dynamic: 11013 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(), 11014 EEnd = Proto->exception_end(); 11015 E != EEnd; ++E) { 11016 if (!Finder.TraverseType(*E)) 11017 return true; 11018 } 11019 break; 11020 } 11021 11022 return false; 11023} 11024 11025bool Sema::checkThisInStaticMemberFunctionAttributes(CXXMethodDecl *Method) { 11026 FindCXXThisExpr Finder(*this); 11027 11028 // Check attributes. 11029 for (Decl::attr_iterator A = Method->attr_begin(), AEnd = Method->attr_end(); 11030 A != AEnd; ++A) { 11031 // FIXME: This should be emitted by tblgen. 11032 Expr *Arg = 0; 11033 ArrayRef<Expr *> Args; 11034 if (GuardedByAttr *G = dyn_cast<GuardedByAttr>(*A)) 11035 Arg = G->getArg(); 11036 else if (PtGuardedByAttr *G = dyn_cast<PtGuardedByAttr>(*A)) 11037 Arg = G->getArg(); 11038 else if (AcquiredAfterAttr *AA = dyn_cast<AcquiredAfterAttr>(*A)) 11039 Args = ArrayRef<Expr *>(AA->args_begin(), AA->args_size()); 11040 else if (AcquiredBeforeAttr *AB = dyn_cast<AcquiredBeforeAttr>(*A)) 11041 Args = ArrayRef<Expr *>(AB->args_begin(), AB->args_size()); 11042 else if (ExclusiveLockFunctionAttr *ELF 11043 = dyn_cast<ExclusiveLockFunctionAttr>(*A)) 11044 Args = ArrayRef<Expr *>(ELF->args_begin(), ELF->args_size()); 11045 else if (SharedLockFunctionAttr *SLF 11046 = dyn_cast<SharedLockFunctionAttr>(*A)) 11047 Args = ArrayRef<Expr *>(SLF->args_begin(), SLF->args_size()); 11048 else if (ExclusiveTrylockFunctionAttr *ETLF 11049 = dyn_cast<ExclusiveTrylockFunctionAttr>(*A)) { 11050 Arg = ETLF->getSuccessValue(); 11051 Args = ArrayRef<Expr *>(ETLF->args_begin(), ETLF->args_size()); 11052 } else if (SharedTrylockFunctionAttr *STLF 11053 = dyn_cast<SharedTrylockFunctionAttr>(*A)) { 11054 Arg = STLF->getSuccessValue(); 11055 Args = ArrayRef<Expr *>(STLF->args_begin(), STLF->args_size()); 11056 } else if (UnlockFunctionAttr *UF = dyn_cast<UnlockFunctionAttr>(*A)) 11057 Args = ArrayRef<Expr *>(UF->args_begin(), UF->args_size()); 11058 else if (LockReturnedAttr *LR = dyn_cast<LockReturnedAttr>(*A)) 11059 Arg = LR->getArg(); 11060 else if (LocksExcludedAttr *LE = dyn_cast<LocksExcludedAttr>(*A)) 11061 Args = ArrayRef<Expr *>(LE->args_begin(), LE->args_size()); 11062 else if (ExclusiveLocksRequiredAttr *ELR 11063 = dyn_cast<ExclusiveLocksRequiredAttr>(*A)) 11064 Args = ArrayRef<Expr *>(ELR->args_begin(), ELR->args_size()); 11065 else if (SharedLocksRequiredAttr *SLR 11066 = dyn_cast<SharedLocksRequiredAttr>(*A)) 11067 Args = ArrayRef<Expr *>(SLR->args_begin(), SLR->args_size()); 11068 11069 if (Arg && !Finder.TraverseStmt(Arg)) 11070 return true; 11071 11072 for (unsigned I = 0, N = Args.size(); I != N; ++I) { 11073 if (!Finder.TraverseStmt(Args[I])) 11074 return true; 11075 } 11076 } 11077 11078 return false; 11079} 11080 11081void 11082Sema::checkExceptionSpecification(ExceptionSpecificationType EST, 11083 ArrayRef<ParsedType> DynamicExceptions, 11084 ArrayRef<SourceRange> DynamicExceptionRanges, 11085 Expr *NoexceptExpr, 11086 llvm::SmallVectorImpl<QualType> &Exceptions, 11087 FunctionProtoType::ExtProtoInfo &EPI) { 11088 Exceptions.clear(); 11089 EPI.ExceptionSpecType = EST; 11090 if (EST == EST_Dynamic) { 11091 Exceptions.reserve(DynamicExceptions.size()); 11092 for (unsigned ei = 0, ee = DynamicExceptions.size(); ei != ee; ++ei) { 11093 // FIXME: Preserve type source info. 11094 QualType ET = GetTypeFromParser(DynamicExceptions[ei]); 11095 11096 SmallVector<UnexpandedParameterPack, 2> Unexpanded; 11097 collectUnexpandedParameterPacks(ET, Unexpanded); 11098 if (!Unexpanded.empty()) { 11099 DiagnoseUnexpandedParameterPacks(DynamicExceptionRanges[ei].getBegin(), 11100 UPPC_ExceptionType, 11101 Unexpanded); 11102 continue; 11103 } 11104 11105 // Check that the type is valid for an exception spec, and 11106 // drop it if not. 11107 if (!CheckSpecifiedExceptionType(ET, DynamicExceptionRanges[ei])) 11108 Exceptions.push_back(ET); 11109 } 11110 EPI.NumExceptions = Exceptions.size(); 11111 EPI.Exceptions = Exceptions.data(); 11112 return; 11113 } 11114 11115 if (EST == EST_ComputedNoexcept) { 11116 // If an error occurred, there's no expression here. 11117 if (NoexceptExpr) { 11118 assert((NoexceptExpr->isTypeDependent() || 11119 NoexceptExpr->getType()->getCanonicalTypeUnqualified() == 11120 Context.BoolTy) && 11121 "Parser should have made sure that the expression is boolean"); 11122 if (NoexceptExpr && DiagnoseUnexpandedParameterPack(NoexceptExpr)) { 11123 EPI.ExceptionSpecType = EST_BasicNoexcept; 11124 return; 11125 } 11126 11127 if (!NoexceptExpr->isValueDependent()) 11128 NoexceptExpr = VerifyIntegerConstantExpression(NoexceptExpr, 0, 11129 diag::err_noexcept_needs_constant_expression, 11130 /*AllowFold*/ false).take(); 11131 EPI.NoexceptExpr = NoexceptExpr; 11132 } 11133 return; 11134 } 11135} 11136 11137/// IdentifyCUDATarget - Determine the CUDA compilation target for this function 11138Sema::CUDAFunctionTarget Sema::IdentifyCUDATarget(const FunctionDecl *D) { 11139 // Implicitly declared functions (e.g. copy constructors) are 11140 // __host__ __device__ 11141 if (D->isImplicit()) 11142 return CFT_HostDevice; 11143 11144 if (D->hasAttr<CUDAGlobalAttr>()) 11145 return CFT_Global; 11146 11147 if (D->hasAttr<CUDADeviceAttr>()) { 11148 if (D->hasAttr<CUDAHostAttr>()) 11149 return CFT_HostDevice; 11150 else 11151 return CFT_Device; 11152 } 11153 11154 return CFT_Host; 11155} 11156 11157bool Sema::CheckCUDATarget(CUDAFunctionTarget CallerTarget, 11158 CUDAFunctionTarget CalleeTarget) { 11159 // CUDA B.1.1 "The __device__ qualifier declares a function that is... 11160 // Callable from the device only." 11161 if (CallerTarget == CFT_Host && CalleeTarget == CFT_Device) 11162 return true; 11163 11164 // CUDA B.1.2 "The __global__ qualifier declares a function that is... 11165 // Callable from the host only." 11166 // CUDA B.1.3 "The __host__ qualifier declares a function that is... 11167 // Callable from the host only." 11168 if ((CallerTarget == CFT_Device || CallerTarget == CFT_Global) && 11169 (CalleeTarget == CFT_Host || CalleeTarget == CFT_Global)) 11170 return true; 11171 11172 if (CallerTarget == CFT_HostDevice && CalleeTarget != CFT_HostDevice) 11173 return true; 11174 11175 return false; 11176} 11177