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DefaultValueExpression.cs
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DefaultValueExpression.cs
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// Copyright 2004-2021 Castle Project - http://www.castleproject.org/
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
namespace Castle.DynamicProxy.Generators.Emitters.SimpleAST
{
using System;
using System.Reflection;
using System.Reflection.Emit;
internal class DefaultValueExpression : Expression
{
private readonly Type type;
public DefaultValueExpression(Type type)
{
this.type = type;
}
public override void Emit(IMemberEmitter member, ILGenerator gen)
{
// TODO: check if this can be simplified by using more of OpCodeUtil and other existing types
if (IsPrimitiveOrClass(type))
{
OpCodeUtil.EmitLoadOpCodeForDefaultValueOfType(gen, type);
}
else if (type.IsValueType || type.IsGenericParameter)
{
// TODO: handle decimal explicitly
var local = gen.DeclareLocal(type);
gen.Emit(OpCodes.Ldloca_S, local);
gen.Emit(OpCodes.Initobj, type);
gen.Emit(OpCodes.Ldloc, local);
}
else if (type.IsByRef)
{
EmitByRef(gen);
}
else
{
throw new NotImplementedException("Can't emit default value for type " + type);
}
}
private void EmitByRef(ILGenerator gen)
{
var elementType = type.GetElementType();
if (IsPrimitiveOrClass(elementType))
{
OpCodeUtil.EmitLoadOpCodeForDefaultValueOfType(gen, elementType);
OpCodeUtil.EmitStoreIndirectOpCodeForType(gen, elementType);
}
else if (elementType.IsGenericParameter || elementType.IsValueType)
{
gen.Emit(OpCodes.Initobj, elementType);
}
else
{
throw new NotImplementedException("Can't emit default value for reference of type " + elementType);
}
}
private bool IsPrimitiveOrClass(Type type)
{
if (type.IsPrimitive && type != typeof(IntPtr) && type != typeof(UIntPtr))
{
return true;
}
return ((type.IsClass || type.IsInterface) &&
type.IsGenericParameter == false &&
type.IsByRef == false);
}
}
}