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//
// System.Reflection/EventInfo.cs
//
// Author:
// Paolo Molaro (lupus@ximian.com)
//
// (C) 2001 Ximian, Inc. http://www.ximian.com
// Copyright (C) 2004-2005 Novell, Inc (http://www.novell.com)
//
// 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.
//
using System.Diagnostics;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;
namespace System.Reflection {
[Serializable]
public abstract partial class EventInfo : MemberInfo {
// Field needed by runtime, just disable warning.
#pragma warning disable CS0169
AddEventAdapter cached_add_event;
#pragma warning restore CS0169
[DebuggerHidden]
[DebuggerStepThrough]
public virtual void AddEventHandler (object target, Delegate handler)
{
// this optimization cause problems with full AOT
// see bug https://bugzilla.xamarin.com/show_bug.cgi?id=3682
#if FULL_AOT_RUNTIME
MethodInfo add = GetAddMethod ();
if (add == null)
throw new InvalidOperationException (SR.InvalidOperation_NoPublicAddMethod);
if (target == null && !add.IsStatic)
throw new TargetException ("Cannot add a handler to a non static event with a null target");
add.Invoke (target, new object [] {handler});
#else
if (cached_add_event == null) {
MethodInfo add = GetAddMethod ();
if (add == null)
throw new InvalidOperationException (SR.InvalidOperation_NoPublicAddMethod);
if (add.DeclaringType.IsValueType) {
if (target == null && !add.IsStatic)
throw new TargetException ("Cannot add a handler to a non static event with a null target");
add.Invoke (target, new object [] {handler});
return;
}
cached_add_event = CreateAddEventDelegate (add);
}
//if (target == null && is_instance)
// throw new TargetException ("Cannot add a handler to a non static event with a null target");
cached_add_event (target, handler);
#endif
}
delegate void AddEventAdapter (object _this, Delegate dele);
// this optimization cause problems with full AOT
// see bug https://bugzilla.xamarin.com/show_bug.cgi?id=3682
// do not revove the above delegate or it's field since it's required by the runtime!
#if !FULL_AOT_RUNTIME
delegate void AddEvent<T, D> (T _this, D dele);
delegate void StaticAddEvent<D> (D dele);
#pragma warning disable 169
// Used via reflection
static void AddEventFrame<T,D> (AddEvent<T,D> addEvent, object obj, object dele)
{
if (obj == null)
throw new TargetException ("Cannot add a handler to a non static event with a null target");
if (!(obj is T))
throw new TargetException ("Object doesn't match target");
if (!(dele is D))
throw new ArgumentException ($"Object of type {dele.GetType ()} cannot be converted to type {typeof (D)}.");
addEvent ((T)obj, (D)dele);
}
static void StaticAddEventAdapterFrame<D> (StaticAddEvent<D> addEvent, object obj, object dele)
{
addEvent ((D)dele);
}
#pragma warning restore 169
/*
* The idea behing this optimization is to use a pair of delegates to simulate the same effect of doing a reflection call.
* The first delegate performs casting and boxing, the second dispatch to the add_... method.
*/
static AddEventAdapter CreateAddEventDelegate (MethodInfo method)
{
Type[] typeVector;
Type addHandlerType;
object addHandlerDelegate;
MethodInfo adapterFrame;
Type addHandlerDelegateType;
string frameName;
if (method.IsStatic) {
typeVector = new Type[] { method.GetParametersInternal () [0].ParameterType };
addHandlerDelegateType = typeof (StaticAddEvent<>);
frameName = "StaticAddEventAdapterFrame";
} else {
typeVector = new Type[] { method.DeclaringType, method.GetParametersInternal () [0].ParameterType };
addHandlerDelegateType = typeof (AddEvent<,>);
frameName = "AddEventFrame";
}
addHandlerType = addHandlerDelegateType.MakeGenericType (typeVector);
#if MOBILE
// with Silverlight a coreclr failure (e.g. Transparent caller creating a delegate on a Critical method)
// would normally throw an ArgumentException, so we set throwOnBindFailure to false and check for a null
// delegate that we can transform into a MethodAccessException
addHandlerDelegate = Delegate.CreateDelegate (addHandlerType, method, false);
if (addHandlerDelegate == null)
throw new MethodAccessException ();
#else
addHandlerDelegate = Delegate.CreateDelegate (addHandlerType, method);
#endif
adapterFrame = typeof (EventInfo).GetMethod (frameName, BindingFlags.Static | BindingFlags.NonPublic);
adapterFrame = adapterFrame.MakeGenericMethod (typeVector);
return (AddEventAdapter)Delegate.CreateDelegate (typeof (AddEventAdapter), addHandlerDelegate, adapterFrame, true);
}
#endif
[MethodImplAttribute (MethodImplOptions.InternalCall)]
static extern EventInfo internal_from_handle_type (IntPtr event_handle, IntPtr type_handle);
internal static EventInfo GetEventFromHandle (Mono.RuntimeEventHandle handle, RuntimeTypeHandle reflectedType)
{
if (handle.Value == IntPtr.Zero)
throw new ArgumentException ("The handle is invalid.");
EventInfo ei = internal_from_handle_type (handle.Value, reflectedType.Value);
if (ei == null)
throw new ArgumentException ("The event handle and the type handle are incompatible.");
return ei;
}
}
}
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