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//------------------------------------------------------------------------------
// <copyright file="ArglessEventHandlerProxy.cs" company="Microsoft">
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
//------------------------------------------------------------------------------
namespace System.Web.Util {
using System;
using System.Reflection;
using System.Reflection.Emit;
using System.Security.Permissions;
using System.Security;
/*
* Proxy that provides EventHandler and redirects it to arg-less method on the given object
*/
internal class ArglessEventHandlerProxy {
private Object _target;
private MethodInfo _arglessMethod;
internal ArglessEventHandlerProxy(Object target, MethodInfo arglessMethod) {
Debug.Assert(arglessMethod.GetParameters().Length == 0);
_target = target;
_arglessMethod = arglessMethod;
}
[ReflectionPermission(SecurityAction.Assert, Flags=ReflectionPermissionFlag.RestrictedMemberAccess)]
internal void Callback(Object sender, EventArgs e) {
_arglessMethod.Invoke(_target, new Object[0]);
}
internal EventHandler Handler {
get {
return new EventHandler(Callback);
}
}
}
internal delegate void VoidMethod();
internal class CalliEventHandlerDelegateProxy {
private delegate void ParameterlessDelegate();
private delegate void ParameterfulDelegate(object sender, EventArgs e);
private IntPtr _functionPointer;
private Object _target;
private bool _argless;
internal CalliEventHandlerDelegateProxy(Object target, IntPtr functionPointer, bool argless) {
_argless = argless;
_target = target;
_functionPointer = functionPointer;
}
internal void Callback(Object sender, EventArgs e) {
if (_argless) {
ParameterlessDelegate del = FastDelegateCreator<ParameterlessDelegate>.BindTo(_target, _functionPointer);
del();
}
else {
ParameterfulDelegate del = FastDelegateCreator<ParameterfulDelegate>.BindTo(_target, _functionPointer);
del(sender, e);
}
}
internal EventHandler Handler {
get {
return new EventHandler(Callback);
}
}
}
#if LCG_Implementation
internal delegate void ArglessMethod(IntPtr methodPtr, Object target);
internal delegate void EventArgMethod(IntPtr methodPtr, Object target, Object source, EventArgs e);
internal class CalliHelper {
internal static ArglessMethod ArglessFunctionCaller;
internal static EventArgMethod EventArgFunctionCaller;
// Make sure we have reflection permission to use ReflectionEmit and access method
[ReflectionPermission(SecurityAction.Assert, Flags = ReflectionPermissionFlag.ReflectionEmit | ReflectionPermissionFlag.MemberAccess)]
static CalliHelper() {
// generate void(void) calli
DynamicMethod dm = new DynamicMethod("void_calli",
typeof(void),
new Type[] { typeof(IntPtr) /* function ptr */, typeof(Object) /* target */},
typeof(CalliHelper).Module);
ILGenerator ilg = dm.GetILGenerator();
ilg.Emit(OpCodes.Ldarg_1);
ilg.Emit(OpCodes.Ldarg_0);
ilg.EmitCalli(OpCodes.Calli, CallingConventions.HasThis, typeof(void), new Type[0], null);
ilg.Emit(OpCodes.Ret);
ArglessFunctionCaller = (ArglessMethod)dm.CreateDelegate(typeof(ArglessMethod));
// generate void(Object, EventArgs) calli
dm = new DynamicMethod("eventarg_calli",
typeof(void),
new Type[] { typeof(IntPtr) /* function ptr */, typeof(Object) /* target */, typeof(Object) /* sender */, typeof(EventArgs) },
typeof(CalliHelper).Module);
ilg = dm.GetILGenerator();
ilg.Emit(OpCodes.Ldarg_1);
ilg.Emit(OpCodes.Ldarg_2);
ilg.Emit(OpCodes.Ldarg_3);
ilg.Emit(OpCodes.Ldarg_0);
ilg.EmitCalli(OpCodes.Calli, CallingConventions.HasThis, typeof(void), new Type[] { typeof(object) /* sender */, typeof(EventArgs) }, null);
ilg.Emit(OpCodes.Ret);
EventArgFunctionCaller = (EventArgMethod)dm.CreateDelegate(typeof(EventArgMethod));
}
}
#endif //LCG_Implementation
#if Reflection_Emit_Implementation
internal delegate void ArglessMethod(IntPtr methodPtr, Object target);
internal delegate void EventArgMethod(IntPtr methodPtr, Object target, Object source, EventArgs e);
internal class CalliHelper {
internal static ArglessMethod ArglessFunctionCaller;
internal static EventArgMethod EventArgFunctionCaller;
// Make sure we have reflection permission to use ReflectionEmit and access method
[ReflectionPermission(SecurityAction.Assert, Flags = ReflectionPermissionFlag.ReflectionEmit | ReflectionPermissionFlag.MemberAccess)]
static CalliHelper() {
AssemblyName an = new AssemblyName("CalliHelper");
AssemblyBuilder ab = AppDomain.CurrentDomain.DefineDynamicAssembly(an, AssemblyBuilderAccess.Run);
ModuleBuilder mb = ab.DefineDynamicModule("CalliHelper.dll");
ConstructorInfo ci = typeof(CLSCompliantAttribute).GetConstructor(new Type[] { typeof(bool) });
CustomAttributeBuilder cb = new CustomAttributeBuilder(ci, new object[] { true });
mb.SetCustomAttribute(cb);
TypeBuilder tb = mb.DefineType("System.Web.Util.CalliHelper", TypeAttributes.NotPublic | TypeAttributes.Sealed);
MethodBuilder methb = tb.DefineMethod("EventArgMethod", MethodAttributes.Assembly | MethodAttributes.Static, typeof(void), new Type[] { typeof(IntPtr), typeof(object), typeof(object), typeof(EventArgs) });
ILGenerator ilg = methb.GetILGenerator();
ilg.Emit(OpCodes.Ldarg_1);
ilg.Emit(OpCodes.Ldarg_2);
ilg.Emit(OpCodes.Ldarg_3);
ilg.Emit(OpCodes.Ldarg_0);
ilg.EmitCalli(OpCodes.Calli, CallingConventions.HasThis, typeof(void), new Type[] { typeof(object), typeof(EventArgs) }, null);
ilg.Emit(OpCodes.Ret);
methb = tb.DefineMethod("ArglessMethod", MethodAttributes.Assembly | MethodAttributes.Static, typeof(void), new Type[] { typeof (IntPtr), typeof(object) });
ilg = methb.GetILGenerator();
ilg.Emit(OpCodes.Ldarg_1);
ilg.Emit(OpCodes.Ldarg_0);
ilg.EmitCalli(OpCodes.Calli, CallingConventions.HasThis, typeof(void), new Type[0], null);
ilg.Emit(OpCodes.Ret);
Type t = tb.CreateType();
ArglessFunctionCaller = (ArglessMethod)Delegate.CreateDelegate(typeof(ArglessMethod), t, "ArglessMethod", true);
EventArgFunctionCaller = (EventArgMethod)Delegate.CreateDelegate(typeof(EventArgMethod), t, "EventArgMethod", true);
//ab.Save("CalliHelper.dll");
}
}
#endif // Reflection_Emit_Implementation
}
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