lib/AST/DeclCXX.cpp - platform/external/clang - Gitiles

 //===--- DeclCXX.cpp - C++ Declaration AST Node Implementation ------------===//
 //
 //                     The LLVM Compiler Infrastructure
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
 // This file implements the C++ related Decl classes.
 //
 //===----------------------------------------------------------------------===//

 #include "clang/AST/DeclCXX.h"
 #include "clang/AST/ASTContext.h"
 #include "clang/AST/Expr.h"
 #include "clang/Basic/IdentifierTable.h"
 #include "llvm/ADT/STLExtras.h"
 using namespace clang;

 //===----------------------------------------------------------------------===//
 // Decl Allocation/Deallocation Method Implementations
 //===----------------------------------------------------------------------===//

 CXXRecordDecl::CXXRecordDecl(Kind K, TagKind TK, DeclContext *DC,
                              SourceLocation L, IdentifierInfo *Id)
   : RecordDecl(K, TK, DC, L, Id),
     UserDeclaredConstructor(false), UserDeclaredCopyConstructor(false),
     UserDeclaredCopyAssignment(false), UserDeclaredDestructor(false),
     Aggregate(true), PlainOldData(true), Polymorphic(false), Bases(0),
     NumBases(0), Conversions(DC, DeclarationName()) { }

 CXXRecordDecl *CXXRecordDecl::Create(ASTContext &C, TagKind TK, DeclContext *DC,
                                      SourceLocation L, IdentifierInfo *Id,
                                      CXXRecordDecl* PrevDecl) {
   CXXRecordDecl* R = new (C) CXXRecordDecl(CXXRecord, TK, DC, L, Id);
   C.getTypeDeclType(R, PrevDecl);
   return R;
 }

 CXXRecordDecl::~CXXRecordDecl() {
   delete [] Bases;
 }

 void
 CXXRecordDecl::setBases(CXXBaseSpecifier const * const *Bases,
                         unsigned NumBases) {
   // C++ [dcl.init.aggr]p1:
   //   An aggregate is an array or a class (clause 9) with [...]
   //   no base classes [...].
   Aggregate = false;

   if (this->Bases)
     delete [] this->Bases;

   // FIXME: allocate using the ASTContext
   this->Bases = new CXXBaseSpecifier[NumBases];
   this->NumBases = NumBases;
   for (unsigned i = 0; i < NumBases; ++i)
     this->Bases[i] = *Bases[i];
 }

 bool CXXRecordDecl::hasConstCopyConstructor(ASTContext &Context) const {
   QualType ClassType
     = Context.getTypeDeclType(const_cast<CXXRecordDecl*>(this));
   DeclarationName ConstructorName
     = Context.DeclarationNames.getCXXConstructorName(
                                            Context.getCanonicalType(ClassType));
   unsigned TypeQuals;
   DeclContext::lookup_const_iterator Con, ConEnd;
   for (llvm::tie(Con, ConEnd) = this->lookup(ConstructorName);
        Con != ConEnd; ++Con) {
     if (cast<CXXConstructorDecl>(*Con)->isCopyConstructor(Context, TypeQuals) &&
         (TypeQuals & QualType::Const) != 0)
       return true;
   }

   return false;
 }

 bool CXXRecordDecl::hasConstCopyAssignment(ASTContext &Context) const {
   QualType ClassType = Context.getCanonicalType(Context.getTypeDeclType(
     const_cast<CXXRecordDecl*>(this)));
   DeclarationName OpName =Context.DeclarationNames.getCXXOperatorName(OO_Equal);

   DeclContext::lookup_const_iterator Op, OpEnd;
   for (llvm::tie(Op, OpEnd) = this->lookup(OpName);
        Op != OpEnd; ++Op) {
     // C++ [class.copy]p9:
     //   A user-declared copy assignment operator is a non-static non-template
     //   member function of class X with exactly one parameter of type X, X&,
     //   const X&, volatile X& or const volatile X&.
     const CXXMethodDecl* Method = cast<CXXMethodDecl>(*Op);
     if (Method->isStatic())
       continue;
     // TODO: Skip templates? Or is this implicitly done due to parameter types?
     const FunctionProtoType *FnType =
       Method->getType()->getAsFunctionProtoType();
     assert(FnType && "Overloaded operator has no prototype.");
     // Don't assert on this; an invalid decl might have been left in the AST.
     if (FnType->getNumArgs() != 1 || FnType->isVariadic())
       continue;
     bool AcceptsConst = true;
     QualType ArgType = FnType->getArgType(0);
     if (const LValueReferenceType *Ref = ArgType->getAsLValueReferenceType()) {
       ArgType = Ref->getPointeeType();
       // Is it a non-const lvalue reference?
       if (!ArgType.isConstQualified())
         AcceptsConst = false;
     }
     if (Context.getCanonicalType(ArgType).getUnqualifiedType() != ClassType)
       continue;

     // We have a single argument of type cv X or cv X&, i.e. we've found the
     // copy assignment operator. Return whether it accepts const arguments.
     return AcceptsConst;
   }
   assert(isInvalidDecl() &&
          "No copy assignment operator declared in valid code.");
   return false;
 }

 void
 CXXRecordDecl::addedConstructor(ASTContext &Context,
                                 CXXConstructorDecl *ConDecl) {
   if (!ConDecl->isImplicit()) {
     // Note that we have a user-declared constructor.
     UserDeclaredConstructor = true;

     // C++ [dcl.init.aggr]p1:
     //   An aggregate is an array or a class (clause 9) with no
     //   user-declared constructors (12.1) [...].
     Aggregate = false;

     // C++ [class]p4:
     //   A POD-struct is an aggregate class [...]
     PlainOldData = false;

     // Note when we have a user-declared copy constructor, which will
     // suppress the implicit declaration of a copy constructor.
     if (ConDecl->isCopyConstructor(Context))
       UserDeclaredCopyConstructor = true;
   }
 }

 void CXXRecordDecl::addedAssignmentOperator(ASTContext &Context,
                                             CXXMethodDecl *OpDecl) {
   // We're interested specifically in copy assignment operators.
   // Unlike addedConstructor, this method is not called for implicit
   // declarations.
   const FunctionProtoType *FnType = OpDecl->getType()->getAsFunctionProtoType();
   assert(FnType && "Overloaded operator has no proto function type.");
   assert(FnType->getNumArgs() == 1 && !FnType->isVariadic());
   QualType ArgType = FnType->getArgType(0);
   if (const LValueReferenceType *Ref = ArgType->getAsLValueReferenceType())
     ArgType = Ref->getPointeeType();

   ArgType = ArgType.getUnqualifiedType();
   QualType ClassType = Context.getCanonicalType(Context.getTypeDeclType(
     const_cast<CXXRecordDecl*>(this)));

   if (ClassType != Context.getCanonicalType(ArgType))
     return;

   // This is a copy assignment operator.
   // Suppress the implicit declaration of a copy constructor.
   UserDeclaredCopyAssignment = true;

   // C++ [class]p4:
   //   A POD-struct is an aggregate class that [...] has no user-defined copy
   //   assignment operator [...].
   PlainOldData = false;
 }

 void CXXRecordDecl::addConversionFunction(ASTContext &Context,
                                           CXXConversionDecl *ConvDecl) {
   Conversions.addOverload(ConvDecl);
 }

 CXXMethodDecl *
 CXXMethodDecl::Create(ASTContext &C, CXXRecordDecl *RD,
                       SourceLocation L, DeclarationName N,
                       QualType T, bool isStatic, bool isInline) {
   return new (C) CXXMethodDecl(CXXMethod, RD, L, N, T, isStatic, isInline);
 }

 QualType CXXMethodDecl::getThisType(ASTContext &C) const {
   // C++ 9.3.2p1: The type of this in a member function of a class X is X*.
   // If the member function is declared const, the type of this is const X*,
   // if the member function is declared volatile, the type of this is
   // volatile X*, and if the member function is declared const volatile,
   // the type of this is const volatile X*.

   assert(isInstance() && "No 'this' for static methods!");
   QualType ClassTy = C.getTagDeclType(const_cast<CXXRecordDecl*>(getParent()));
   ClassTy = ClassTy.getWithAdditionalQualifiers(getTypeQualifiers());
   return C.getPointerType(ClassTy).withConst();
 }

 CXXBaseOrMemberInitializer::
 CXXBaseOrMemberInitializer(QualType BaseType, Expr **Args, unsigned NumArgs)
   : Args(0), NumArgs(0) {
   BaseOrMember = reinterpret_cast<uintptr_t>(BaseType.getTypePtr());
   assert((BaseOrMember & 0x01) == 0 && "Invalid base class type pointer");
   BaseOrMember |= 0x01;

   if (NumArgs > 0) {
     this->NumArgs = NumArgs;
     this->Args = new Expr*[NumArgs];
     for (unsigned Idx = 0; Idx < NumArgs; ++Idx)
       this->Args[Idx] = Args[Idx];
   }
 }

 CXXBaseOrMemberInitializer::
 CXXBaseOrMemberInitializer(FieldDecl *Member, Expr **Args, unsigned NumArgs)
   : Args(0), NumArgs(0) {
   BaseOrMember = reinterpret_cast<uintptr_t>(Member);
   assert((BaseOrMember & 0x01) == 0 && "Invalid member pointer");

   if (NumArgs > 0) {
     this->NumArgs = NumArgs;
     this->Args = new Expr*[NumArgs];
     for (unsigned Idx = 0; Idx < NumArgs; ++Idx)
       this->Args[Idx] = Args[Idx];
   }
 }

 CXXBaseOrMemberInitializer::~CXXBaseOrMemberInitializer() {
   delete [] Args;
 }

 CXXConstructorDecl *
 CXXConstructorDecl::Create(ASTContext &C, CXXRecordDecl *RD,
                            SourceLocation L, DeclarationName N,
                            QualType T, bool isExplicit,
                            bool isInline, bool isImplicitlyDeclared) {
   assert(N.getNameKind() == DeclarationName::CXXConstructorName &&
          "Name must refer to a constructor");
   return new (C) CXXConstructorDecl(RD, L, N, T, isExplicit, isInline,
                                       isImplicitlyDeclared);
 }

 bool CXXConstructorDecl::isDefaultConstructor() const {
   // C++ [class.ctor]p5:
   //   A default constructor for a class X is a constructor of class
   //   X that can be called without an argument.
   return (getNumParams() == 0) ||
          (getNumParams() > 0 && getParamDecl(0)->getDefaultArg() != 0);
 }

 bool
 CXXConstructorDecl::isCopyConstructor(ASTContext &Context,
                                       unsigned &TypeQuals) const {
   // C++ [class.copy]p2:
   //   A non-template constructor for class X is a copy constructor
   //   if its first parameter is of type X&, const X&, volatile X& or
   //   const volatile X&, and either there are no other parameters
   //   or else all other parameters have default arguments (8.3.6).
   if ((getNumParams() < 1) ||
       (getNumParams() > 1 && getParamDecl(1)->getDefaultArg() == 0))
     return false;

   const ParmVarDecl *Param = getParamDecl(0);

   // Do we have a reference type? Rvalue references don't count.
   const LValueReferenceType *ParamRefType =
     Param->getType()->getAsLValueReferenceType();
   if (!ParamRefType)
     return false;

   // Is it a reference to our class type?
   QualType PointeeType
     = Context.getCanonicalType(ParamRefType->getPointeeType());
   QualType ClassTy
     = Context.getTagDeclType(const_cast<CXXRecordDecl*>(getParent()));
   if (PointeeType.getUnqualifiedType() != ClassTy)
     return false;

   // We have a copy constructor.
   TypeQuals = PointeeType.getCVRQualifiers();
   return true;
 }

 bool CXXConstructorDecl::isConvertingConstructor() const {
   // C++ [class.conv.ctor]p1:
   //   A constructor declared without the function-specifier explicit
   //   that can be called with a single parameter specifies a
   //   conversion from the type of its first parameter to the type of
   //   its class. Such a constructor is called a converting
   //   constructor.
   if (isExplicit())
     return false;

   return (getNumParams() == 0 &&
           getType()->getAsFunctionProtoType()->isVariadic()) ||
          (getNumParams() == 1) ||
          (getNumParams() > 1 && getParamDecl(1)->getDefaultArg() != 0);
 }

 CXXDestructorDecl *
 CXXDestructorDecl::Create(ASTContext &C, CXXRecordDecl *RD,
                           SourceLocation L, DeclarationName N,
                           QualType T, bool isInline,
                           bool isImplicitlyDeclared) {
   assert(N.getNameKind() == DeclarationName::CXXDestructorName &&
          "Name must refer to a destructor");
   return new (C) CXXDestructorDecl(RD, L, N, T, isInline,
                                    isImplicitlyDeclared);
 }

 CXXConversionDecl *
 CXXConversionDecl::Create(ASTContext &C, CXXRecordDecl *RD,
                           SourceLocation L, DeclarationName N,
                           QualType T, bool isInline, bool isExplicit) {
   assert(N.getNameKind() == DeclarationName::CXXConversionFunctionName &&
          "Name must refer to a conversion function");
   return new (C) CXXConversionDecl(RD, L, N, T, isInline, isExplicit);
 }

 OverloadedFunctionDecl *
 OverloadedFunctionDecl::Create(ASTContext &C, DeclContext *DC,
                                DeclarationName N) {
   return new (C) OverloadedFunctionDecl(DC, N);
 }

 LinkageSpecDecl *LinkageSpecDecl::Create(ASTContext &C,
                                          DeclContext *DC,
                                          SourceLocation L,
                                          LanguageIDs Lang, bool Braces) {
   return new (C) LinkageSpecDecl(DC, L, Lang, Braces);
 }

 UsingDirectiveDecl *UsingDirectiveDecl::Create(ASTContext &C, DeclContext *DC,
                                                SourceLocation L,
                                                SourceLocation NamespaceLoc,
                                                SourceLocation IdentLoc,
                                                NamespaceDecl *Used,
                                                DeclContext *CommonAncestor) {
   return new (C) UsingDirectiveDecl(DC, L, NamespaceLoc, IdentLoc,
                                     Used, CommonAncestor);
 }

 StaticAssertDecl *StaticAssertDecl::Create(ASTContext &C, DeclContext *DC,
                                            SourceLocation L, Expr *AssertExpr,
                                            StringLiteral *Message) {
   return new (C) StaticAssertDecl(DC, L, AssertExpr, Message);
 }

 void StaticAssertDecl::Destroy(ASTContext& C) {
   AssertExpr->Destroy(C);
   Message->Destroy(C);
   this->~StaticAssertDecl();
   C.Deallocate((void *)this);
 }

 StaticAssertDecl::~StaticAssertDecl() {
 }
	//===--- DeclCXX.cpp - C++ Declaration AST Node Implementation ------------===//
	//
	// The LLVM Compiler Infrastructure
	//
	// This file is distributed under the University of Illinois Open Source
	// License. See LICENSE.TXT for details.
	//
	//===----------------------------------------------------------------------===//
	//
	// This file implements the C++ related Decl classes.
	//
	//===----------------------------------------------------------------------===//

	#include "clang/AST/DeclCXX.h"
	#include "clang/AST/ASTContext.h"
	#include "clang/AST/Expr.h"
	#include "clang/Basic/IdentifierTable.h"
	#include "llvm/ADT/STLExtras.h"
	using namespace clang;

	//===----------------------------------------------------------------------===//
	// Decl Allocation/Deallocation Method Implementations
	//===----------------------------------------------------------------------===//

	CXXRecordDecl::CXXRecordDecl(Kind K, TagKind TK, DeclContext *DC,
	SourceLocation L, IdentifierInfo *Id)
	: RecordDecl(K, TK, DC, L, Id),
	UserDeclaredConstructor(false), UserDeclaredCopyConstructor(false),
	UserDeclaredCopyAssignment(false), UserDeclaredDestructor(false),
	Aggregate(true), PlainOldData(true), Polymorphic(false), Bases(0),
	NumBases(0), Conversions(DC, DeclarationName()) { }

	CXXRecordDecl CXXRecordDecl::Create(ASTContext &C, TagKind TK, DeclContext DC,
	SourceLocation L, IdentifierInfo *Id,
	CXXRecordDecl* PrevDecl) {
	CXXRecordDecl* R = new (C) CXXRecordDecl(CXXRecord, TK, DC, L, Id);
	C.getTypeDeclType(R, PrevDecl);
	return R;
	}

	CXXRecordDecl::~CXXRecordDecl() {
	delete [] Bases;
	}

	void
	CXXRecordDecl::setBases(CXXBaseSpecifier const * const *Bases,
	unsigned NumBases) {
	// C++ [dcl.init.aggr]p1:
	// An aggregate is an array or a class (clause 9) with [...]
	// no base classes [...].
	Aggregate = false;

	if (this->Bases)
	delete [] this->Bases;

	// FIXME: allocate using the ASTContext
	this->Bases = new CXXBaseSpecifier[NumBases];
	this->NumBases = NumBases;
	for (unsigned i = 0; i < NumBases; ++i)
	this->Bases[i] = *Bases[i];
	}

	bool CXXRecordDecl::hasConstCopyConstructor(ASTContext &Context) const {
	QualType ClassType
	= Context.getTypeDeclType(const_cast<CXXRecordDecl*>(this));
	DeclarationName ConstructorName
	= Context.DeclarationNames.getCXXConstructorName(
	Context.getCanonicalType(ClassType));
	unsigned TypeQuals;
	DeclContext::lookup_const_iterator Con, ConEnd;
	for (llvm::tie(Con, ConEnd) = this->lookup(ConstructorName);
	Con != ConEnd; ++Con) {
	if (cast<CXXConstructorDecl>(*Con)->isCopyConstructor(Context, TypeQuals) &&
	(TypeQuals & QualType::Const) != 0)
	return true;
	}

	return false;
	}

	bool CXXRecordDecl::hasConstCopyAssignment(ASTContext &Context) const {
	QualType ClassType = Context.getCanonicalType(Context.getTypeDeclType(
	const_cast<CXXRecordDecl*>(this)));
	DeclarationName OpName =Context.DeclarationNames.getCXXOperatorName(OO_Equal);

	DeclContext::lookup_const_iterator Op, OpEnd;
	for (llvm::tie(Op, OpEnd) = this->lookup(OpName);
	Op != OpEnd; ++Op) {
	// C++ [class.copy]p9:
	// A user-declared copy assignment operator is a non-static non-template
	// member function of class X with exactly one parameter of type X, X&,
	// const X&, volatile X& or const volatile X&.
	const CXXMethodDecl* Method = cast<CXXMethodDecl>(*Op);
	if (Method->isStatic())
	continue;
	// TODO: Skip templates? Or is this implicitly done due to parameter types?
	const FunctionProtoType *FnType =
	Method->getType()->getAsFunctionProtoType();
	assert(FnType && "Overloaded operator has no prototype.");
	// Don't assert on this; an invalid decl might have been left in the AST.
	if (FnType->getNumArgs() != 1 \|\| FnType->isVariadic())
	continue;
	bool AcceptsConst = true;
	QualType ArgType = FnType->getArgType(0);
	if (const LValueReferenceType *Ref = ArgType->getAsLValueReferenceType()) {
	ArgType = Ref->getPointeeType();
	// Is it a non-const lvalue reference?
	if (!ArgType.isConstQualified())
	AcceptsConst = false;
	}
	if (Context.getCanonicalType(ArgType).getUnqualifiedType() != ClassType)
	continue;

	// We have a single argument of type cv X or cv X&, i.e. we've found the
	// copy assignment operator. Return whether it accepts const arguments.
	return AcceptsConst;
	}
	assert(isInvalidDecl() &&
	"No copy assignment operator declared in valid code.");
	return false;
	}

	void
	CXXRecordDecl::addedConstructor(ASTContext &Context,
	CXXConstructorDecl *ConDecl) {
	if (!ConDecl->isImplicit()) {
	// Note that we have a user-declared constructor.
	UserDeclaredConstructor = true;

	// C++ [dcl.init.aggr]p1:
	// An aggregate is an array or a class (clause 9) with no
	// user-declared constructors (12.1) [...].
	Aggregate = false;

	// C++ [class]p4:
	// A POD-struct is an aggregate class [...]
	PlainOldData = false;

	// Note when we have a user-declared copy constructor, which will
	// suppress the implicit declaration of a copy constructor.
	if (ConDecl->isCopyConstructor(Context))
	UserDeclaredCopyConstructor = true;
	}
	}

	void CXXRecordDecl::addedAssignmentOperator(ASTContext &Context,
	CXXMethodDecl *OpDecl) {
	// We're interested specifically in copy assignment operators.
	// Unlike addedConstructor, this method is not called for implicit
	// declarations.
	const FunctionProtoType *FnType = OpDecl->getType()->getAsFunctionProtoType();
	assert(FnType && "Overloaded operator has no proto function type.");
	assert(FnType->getNumArgs() == 1 && !FnType->isVariadic());
	QualType ArgType = FnType->getArgType(0);
	if (const LValueReferenceType *Ref = ArgType->getAsLValueReferenceType())
	ArgType = Ref->getPointeeType();

	ArgType = ArgType.getUnqualifiedType();
	QualType ClassType = Context.getCanonicalType(Context.getTypeDeclType(
	const_cast<CXXRecordDecl*>(this)));

	if (ClassType != Context.getCanonicalType(ArgType))
	return;

	// This is a copy assignment operator.
	// Suppress the implicit declaration of a copy constructor.
	UserDeclaredCopyAssignment = true;

	// C++ [class]p4:
	// A POD-struct is an aggregate class that [...] has no user-defined copy
	// assignment operator [...].
	PlainOldData = false;
	}

	void CXXRecordDecl::addConversionFunction(ASTContext &Context,
	CXXConversionDecl *ConvDecl) {
	Conversions.addOverload(ConvDecl);
	}

	CXXMethodDecl *
	CXXMethodDecl::Create(ASTContext &C, CXXRecordDecl *RD,
	SourceLocation L, DeclarationName N,
	QualType T, bool isStatic, bool isInline) {
	return new (C) CXXMethodDecl(CXXMethod, RD, L, N, T, isStatic, isInline);
	}

	QualType CXXMethodDecl::getThisType(ASTContext &C) const {
	// C++ 9.3.2p1: The type of this in a member function of a class X is X*.
	// If the member function is declared const, the type of this is const X*,
	// if the member function is declared volatile, the type of this is
	// volatile X*, and if the member function is declared const volatile,
	// the type of this is const volatile X*.

	assert(isInstance() && "No 'this' for static methods!");
	QualType ClassTy = C.getTagDeclType(const_cast<CXXRecordDecl*>(getParent()));
	ClassTy = ClassTy.getWithAdditionalQualifiers(getTypeQualifiers());
	return C.getPointerType(ClassTy).withConst();
	}

	CXXBaseOrMemberInitializer::
	CXXBaseOrMemberInitializer(QualType BaseType, Expr **Args, unsigned NumArgs)
	: Args(0), NumArgs(0) {
	BaseOrMember = reinterpret_cast<uintptr_t>(BaseType.getTypePtr());
	assert((BaseOrMember & 0x01) == 0 && "Invalid base class type pointer");
	BaseOrMember \|= 0x01;

	if (NumArgs > 0) {
	this->NumArgs = NumArgs;
	this->Args = new Expr*[NumArgs];
	for (unsigned Idx = 0; Idx < NumArgs; ++Idx)
	this->Args[Idx] = Args[Idx];
	}
	}

	CXXBaseOrMemberInitializer::
	CXXBaseOrMemberInitializer(FieldDecl Member, Expr *Args, unsigned NumArgs)
	: Args(0), NumArgs(0) {
	BaseOrMember = reinterpret_cast<uintptr_t>(Member);
	assert((BaseOrMember & 0x01) == 0 && "Invalid member pointer");

	if (NumArgs > 0) {
	this->NumArgs = NumArgs;
	this->Args = new Expr*[NumArgs];
	for (unsigned Idx = 0; Idx < NumArgs; ++Idx)
	this->Args[Idx] = Args[Idx];
	}
	}

	CXXBaseOrMemberInitializer::~CXXBaseOrMemberInitializer() {
	delete [] Args;
	}

	CXXConstructorDecl *
	CXXConstructorDecl::Create(ASTContext &C, CXXRecordDecl *RD,
	SourceLocation L, DeclarationName N,
	QualType T, bool isExplicit,
	bool isInline, bool isImplicitlyDeclared) {
	assert(N.getNameKind() == DeclarationName::CXXConstructorName &&
	"Name must refer to a constructor");
	return new (C) CXXConstructorDecl(RD, L, N, T, isExplicit, isInline,
	isImplicitlyDeclared);
	}

	bool CXXConstructorDecl::isDefaultConstructor() const {
	// C++ [class.ctor]p5:
	// A default constructor for a class X is a constructor of class
	// X that can be called without an argument.
	return (getNumParams() == 0) \|\|
	(getNumParams() > 0 && getParamDecl(0)->getDefaultArg() != 0);
	}

	bool
	CXXConstructorDecl::isCopyConstructor(ASTContext &Context,
	unsigned &TypeQuals) const {
	// C++ [class.copy]p2:
	// A non-template constructor for class X is a copy constructor
	// if its first parameter is of type X&, const X&, volatile X& or
	// const volatile X&, and either there are no other parameters
	// or else all other parameters have default arguments (8.3.6).
	if ((getNumParams() < 1) \|\|
	(getNumParams() > 1 && getParamDecl(1)->getDefaultArg() == 0))
	return false;

	const ParmVarDecl *Param = getParamDecl(0);

	// Do we have a reference type? Rvalue references don't count.
	const LValueReferenceType *ParamRefType =
	Param->getType()->getAsLValueReferenceType();
	if (!ParamRefType)
	return false;

	// Is it a reference to our class type?
	QualType PointeeType
	= Context.getCanonicalType(ParamRefType->getPointeeType());
	QualType ClassTy
	= Context.getTagDeclType(const_cast<CXXRecordDecl*>(getParent()));
	if (PointeeType.getUnqualifiedType() != ClassTy)
	return false;

	// We have a copy constructor.
	TypeQuals = PointeeType.getCVRQualifiers();
	return true;
	}

	bool CXXConstructorDecl::isConvertingConstructor() const {
	// C++ [class.conv.ctor]p1:
	// A constructor declared without the function-specifier explicit
	// that can be called with a single parameter specifies a
	// conversion from the type of its first parameter to the type of
	// its class. Such a constructor is called a converting
	// constructor.
	if (isExplicit())
	return false;

	return (getNumParams() == 0 &&
	getType()->getAsFunctionProtoType()->isVariadic()) \|\|
	(getNumParams() == 1) \|\|
	(getNumParams() > 1 && getParamDecl(1)->getDefaultArg() != 0);
	}

	CXXDestructorDecl *
	CXXDestructorDecl::Create(ASTContext &C, CXXRecordDecl *RD,
	SourceLocation L, DeclarationName N,
	QualType T, bool isInline,
	bool isImplicitlyDeclared) {
	assert(N.getNameKind() == DeclarationName::CXXDestructorName &&
	"Name must refer to a destructor");
	return new (C) CXXDestructorDecl(RD, L, N, T, isInline,
	isImplicitlyDeclared);
	}

	CXXConversionDecl *
	CXXConversionDecl::Create(ASTContext &C, CXXRecordDecl *RD,
	SourceLocation L, DeclarationName N,
	QualType T, bool isInline, bool isExplicit) {
	assert(N.getNameKind() == DeclarationName::CXXConversionFunctionName &&
	"Name must refer to a conversion function");
	return new (C) CXXConversionDecl(RD, L, N, T, isInline, isExplicit);
	}

	OverloadedFunctionDecl *
	OverloadedFunctionDecl::Create(ASTContext &C, DeclContext *DC,
	DeclarationName N) {
	return new (C) OverloadedFunctionDecl(DC, N);
	}

	LinkageSpecDecl *LinkageSpecDecl::Create(ASTContext &C,
	DeclContext *DC,
	SourceLocation L,
	LanguageIDs Lang, bool Braces) {
	return new (C) LinkageSpecDecl(DC, L, Lang, Braces);
	}

	UsingDirectiveDecl UsingDirectiveDecl::Create(ASTContext &C, DeclContext DC,
	SourceLocation L,
	SourceLocation NamespaceLoc,
	SourceLocation IdentLoc,
	NamespaceDecl *Used,
	DeclContext *CommonAncestor) {
	return new (C) UsingDirectiveDecl(DC, L, NamespaceLoc, IdentLoc,
	Used, CommonAncestor);
	}

	StaticAssertDecl StaticAssertDecl::Create(ASTContext &C, DeclContext DC,
	SourceLocation L, Expr *AssertExpr,
	StringLiteral *Message) {
	return new (C) StaticAssertDecl(DC, L, AssertExpr, Message);
	}

	void StaticAssertDecl::Destroy(ASTContext& C) {
	AssertExpr->Destroy(C);
	Message->Destroy(C);
	this->~StaticAssertDecl();
	C.Deallocate((void *)this);
	}

	StaticAssertDecl::~StaticAssertDecl() {
	}