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#region License
// Copyright (c) 2007 James Newton-King
//
// Permission is hereby granted, free of charge, to any person
// obtaining a copy of this software and associated documentation
// files (the "Software"), to deal in the Software without
// restriction, including without limitation the rights to use,
// copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following
// conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
// OTHER DEALINGS IN THE SOFTWARE.
#endregion
#if !PocketPC && !SILVERLIGHT
using System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using System.Reflection.Emit;
using System.Text;
using System.Globalization;
namespace Newtonsoft.Json.Utilities
{
internal class DynamicReflectionDelegateFactory : ReflectionDelegateFactory
{
public static DynamicReflectionDelegateFactory Instance = new DynamicReflectionDelegateFactory();
private static DynamicMethod CreateDynamicMethod(string name, Type returnType, Type[] parameterTypes, Type owner)
{
DynamicMethod dynamicMethod = !owner.IsInterface()
? new DynamicMethod(name, returnType, parameterTypes, owner, true)
: new DynamicMethod(name, returnType, parameterTypes, owner.Module(), true);
return dynamicMethod;
}
public override MethodCall<T, object> CreateMethodCall<T>(MethodBase method)
{
DynamicMethod dynamicMethod = CreateDynamicMethod(method.ToString(), typeof(object), new[] { typeof(object), typeof(object[]) }, method.DeclaringType);
ILGenerator generator = dynamicMethod.GetILGenerator();
GenerateCreateMethodCallIL(method, generator);
return (MethodCall<T, object>)dynamicMethod.CreateDelegate(typeof(MethodCall<T, object>));
}
private void GenerateCreateMethodCallIL(MethodBase method, ILGenerator generator)
{
ParameterInfo[] args = method.GetParameters();
Label argsOk = generator.DefineLabel();
generator.Emit(OpCodes.Ldarg_1);
generator.Emit(OpCodes.Ldlen);
generator.Emit(OpCodes.Ldc_I4, args.Length);
generator.Emit(OpCodes.Beq, argsOk);
generator.Emit(OpCodes.Newobj, typeof(TargetParameterCountException).GetConstructor(ReflectionUtils.EmptyTypes));
generator.Emit(OpCodes.Throw);
generator.MarkLabel(argsOk);
if (!method.IsConstructor && !method.IsStatic)
generator.PushInstance(method.DeclaringType);
for (int i = 0; i < args.Length; i++)
{
generator.Emit(OpCodes.Ldarg_1);
generator.Emit(OpCodes.Ldc_I4, i);
generator.Emit(OpCodes.Ldelem_Ref);
generator.UnboxIfNeeded(args[i].ParameterType);
}
if (method.IsConstructor)
generator.Emit(OpCodes.Newobj, (ConstructorInfo)method);
else if (method.IsFinal || !method.IsVirtual)
generator.CallMethod((MethodInfo)method);
Type returnType = method.IsConstructor
? method.DeclaringType
: ((MethodInfo)method).ReturnType;
if (returnType != typeof(void))
generator.BoxIfNeeded(returnType);
else
generator.Emit(OpCodes.Ldnull);
generator.Return();
}
public override Func<T> CreateDefaultConstructor<T>(Type type)
{
DynamicMethod dynamicMethod = CreateDynamicMethod("Create" + type.FullName, typeof(T), ReflectionUtils.EmptyTypes, type);
dynamicMethod.InitLocals = true;
ILGenerator generator = dynamicMethod.GetILGenerator();
GenerateCreateDefaultConstructorIL(type, generator);
return (Func<T>)dynamicMethod.CreateDelegate(typeof(Func<T>));
}
private void GenerateCreateDefaultConstructorIL(Type type, ILGenerator generator)
{
if (type.IsValueType())
{
generator.DeclareLocal(type);
generator.Emit(OpCodes.Ldloc_0);
generator.Emit(OpCodes.Box, type);
}
else
{
ConstructorInfo constructorInfo =
type.GetConstructor(BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance, null,
ReflectionUtils.EmptyTypes, null);
if (constructorInfo == null)
throw new Exception("Could not get constructor for {0}.".FormatWith(CultureInfo.InvariantCulture, type));
generator.Emit(OpCodes.Newobj, constructorInfo);
}
generator.Return();
}
public override Func<T, object> CreateGet<T>(PropertyInfo propertyInfo)
{
DynamicMethod dynamicMethod = CreateDynamicMethod("Get" + propertyInfo.Name, typeof(T), new[] { typeof(object) }, propertyInfo.DeclaringType);
ILGenerator generator = dynamicMethod.GetILGenerator();
GenerateCreateGetPropertyIL(propertyInfo, generator);
return (Func<T, object>)dynamicMethod.CreateDelegate(typeof(Func<T, object>));
}
private void GenerateCreateGetPropertyIL(PropertyInfo propertyInfo, ILGenerator generator)
{
MethodInfo getMethod = propertyInfo.GetGetMethod(true);
if (getMethod == null)
throw new Exception("Property '{0}' does not have a getter.".FormatWith(CultureInfo.InvariantCulture, propertyInfo.Name));
if (!getMethod.IsStatic)
generator.PushInstance(propertyInfo.DeclaringType);
generator.CallMethod(getMethod);
generator.BoxIfNeeded(propertyInfo.PropertyType);
generator.Return();
}
public override Func<T, object> CreateGet<T>(FieldInfo fieldInfo)
{
DynamicMethod dynamicMethod = CreateDynamicMethod("Get" + fieldInfo.Name, typeof(T), new[] { typeof(object) }, fieldInfo.DeclaringType);
ILGenerator generator = dynamicMethod.GetILGenerator();
GenerateCreateGetFieldIL(fieldInfo, generator);
return (Func<T, object>)dynamicMethod.CreateDelegate(typeof(Func<T, object>));
}
private void GenerateCreateGetFieldIL(FieldInfo fieldInfo, ILGenerator generator)
{
if (!fieldInfo.IsStatic)
generator.PushInstance(fieldInfo.DeclaringType);
generator.Emit(OpCodes.Ldfld, fieldInfo);
generator.BoxIfNeeded(fieldInfo.FieldType);
generator.Return();
}
public override Action<T, object> CreateSet<T>(FieldInfo fieldInfo)
{
DynamicMethod dynamicMethod = CreateDynamicMethod("Set" + fieldInfo.Name, null, new[] { typeof(T), typeof(object) }, fieldInfo.DeclaringType);
ILGenerator generator = dynamicMethod.GetILGenerator();
GenerateCreateSetFieldIL(fieldInfo, generator);
return (Action<T, object>)dynamicMethod.CreateDelegate(typeof(Action<T, object>));
}
internal static void GenerateCreateSetFieldIL(FieldInfo fieldInfo, ILGenerator generator)
{
if (!fieldInfo.IsStatic)
generator.PushInstance(fieldInfo.DeclaringType);
generator.Emit(OpCodes.Ldarg_1);
generator.UnboxIfNeeded(fieldInfo.FieldType);
generator.Emit(OpCodes.Stfld, fieldInfo);
generator.Return();
}
public override Action<T, object> CreateSet<T>(PropertyInfo propertyInfo)
{
DynamicMethod dynamicMethod = CreateDynamicMethod("Set" + propertyInfo.Name, null, new[] { typeof(T), typeof(object) }, propertyInfo.DeclaringType);
ILGenerator generator = dynamicMethod.GetILGenerator();
GenerateCreateSetPropertyIL(propertyInfo, generator);
return (Action<T, object>)dynamicMethod.CreateDelegate(typeof(Action<T, object>));
}
internal static void GenerateCreateSetPropertyIL(PropertyInfo propertyInfo, ILGenerator generator)
{
MethodInfo setMethod = propertyInfo.GetSetMethod(true);
if (!setMethod.IsStatic)
generator.PushInstance(propertyInfo.DeclaringType);
generator.Emit(OpCodes.Ldarg_1);
generator.UnboxIfNeeded(propertyInfo.PropertyType);
generator.CallMethod(setMethod);
generator.Return();
}
}
}
#endif
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