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//
// System.Delegate.cs
//
// Authors:
// Miguel de Icaza (miguel@ximian.com)
// Daniel Stodden (stodden@in.tum.de)
// Dietmar Maurer (dietmar@ximian.com)
// Marek Safar (marek.safar@gmail.com)
//
// (C) Ximian, Inc. http://www.ximian.com
// Copyright (C) 2004 Novell, Inc (http://www.novell.com)
// Copyright 2014 Xamarin, Inc (http://www.xamarin.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.Reflection;
using System.Runtime.Remoting;
using System.Runtime.Serialization;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;
namespace System
{
/* Contains the rarely used fields of Delegate */
sealed class DelegateData
{
public Type target_type;
public string method_name;
public bool curried_first_arg;
}
[ClassInterface (ClassInterfaceType.AutoDual)]
[System.Runtime.InteropServices.ComVisible (true)]
[Serializable]
[StructLayout (LayoutKind.Sequential)]
public abstract class Delegate : ICloneable, ISerializable
{
#region Sync with object-internals.h
#pragma warning disable 169, 414, 649
private IntPtr method_ptr;
private IntPtr invoke_impl;
private object m_target;
private IntPtr method;
private IntPtr delegate_trampoline;
private IntPtr extra_arg;
private IntPtr method_code;
private MethodInfo method_info;
// Keep a ref of the MethodInfo passed to CreateDelegate.
// Used to keep DynamicMethods alive.
private MethodInfo original_method_info;
private DelegateData data;
private bool method_is_virtual;
#pragma warning restore 169, 414, 649
#endregion
protected Delegate (object target, string method)
{
if (target == null)
throw new ArgumentNullException ("target");
if (method == null)
throw new ArgumentNullException ("method");
this.m_target = target;
this.data = new DelegateData ();
this.data.method_name = method;
}
protected Delegate (Type target, string method)
{
if (target == null)
throw new ArgumentNullException ("target");
if (method == null)
throw new ArgumentNullException ("method");
this.data = new DelegateData ();
this.data.method_name = method;
this.data.target_type = target;
}
public MethodInfo Method {
get {
return GetMethodImpl ();
}
}
[MethodImplAttribute (MethodImplOptions.InternalCall)]
extern MethodInfo GetVirtualMethod_internal ();
public object Target {
get {
return m_target;
}
}
//
// Methods
//
[MethodImplAttribute (MethodImplOptions.InternalCall)]
internal static extern Delegate CreateDelegate_internal (Type type, object target, MethodInfo info, bool throwOnBindFailure);
private static bool arg_type_match (Type delArgType, Type argType) {
bool match = delArgType == argType;
// Delegate contravariance
if (!match) {
if (!argType.IsValueType && argType.IsAssignableFrom (delArgType))
match = true;
}
// enum basetypes
if (!match) {
if (delArgType.IsEnum && Enum.GetUnderlyingType (delArgType) == argType)
match = true;
else if (argType.IsEnum && Enum.GetUnderlyingType (argType) == delArgType)
match = true;
}
return match;
}
private static bool arg_type_match_this (Type delArgType, Type argType, bool boxedThis) {
bool match;
if (argType.IsValueType)
match = delArgType.IsByRef && delArgType.GetElementType () == argType ||
(boxedThis && delArgType == argType);
else
match = delArgType == argType || argType.IsAssignableFrom (delArgType);
return match;
}
private static bool return_type_match (Type delReturnType, Type returnType) {
bool returnMatch = returnType == delReturnType;
if (!returnMatch) {
// Delegate covariance
if (!returnType.IsValueType && delReturnType.IsAssignableFrom (returnType))
returnMatch = true;
}
return returnMatch;
}
public static Delegate CreateDelegate (Type type, object firstArgument, MethodInfo method, bool throwOnBindFailure)
{
return CreateDelegate (type, firstArgument, method, throwOnBindFailure, true);
}
static Delegate CreateDelegate (Type type, object firstArgument, MethodInfo method, bool throwOnBindFailure, bool allowClosed)
{
// The name of the parameter changed in 2.0
object target = firstArgument;
if (type == null)
throw new ArgumentNullException ("type");
if (method == null)
throw new ArgumentNullException ("method");
if (!type.IsSubclassOf (typeof (MulticastDelegate)))
throw new ArgumentException ("type is not a subclass of Multicastdelegate");
MethodInfo invoke = type.GetMethod ("Invoke");
if (!return_type_match (invoke.ReturnType, method.ReturnType)) {
if (throwOnBindFailure)
throw new ArgumentException ("method return type is incompatible");
else
return null;
}
ParameterInfo[] delargs = invoke.GetParametersInternal ();
ParameterInfo[] args = method.GetParametersInternal ();
bool argLengthMatch;
if (target != null) {
// delegate closed over target
if (!method.IsStatic)
// target is passed as this
argLengthMatch = (args.Length == delargs.Length);
else
// target is passed as the first argument to the static method
argLengthMatch = (args.Length == delargs.Length + 1);
} else {
if (!method.IsStatic) {
//
// Net 2.0 feature. The first argument of the delegate is passed
// as the 'this' argument to the method.
//
argLengthMatch = (args.Length + 1 == delargs.Length);
if (!argLengthMatch)
// closed over a null reference
argLengthMatch = (args.Length == delargs.Length);
} else {
argLengthMatch = (args.Length == delargs.Length);
if (!argLengthMatch)
// closed over a null reference
argLengthMatch = args.Length == delargs.Length + 1;
}
}
if (!argLengthMatch) {
if (throwOnBindFailure)
throw new ArgumentException ("method argument length mismatch");
else
return null;
}
bool argsMatch;
DelegateData delegate_data = new DelegateData ();
if (target != null) {
if (!method.IsStatic) {
argsMatch = arg_type_match_this (target.GetType (), method.DeclaringType, true);
for (int i = 0; i < args.Length; i++)
argsMatch &= arg_type_match (delargs [i].ParameterType, args [i].ParameterType);
} else {
argsMatch = arg_type_match (target.GetType (), args [0].ParameterType);
for (int i = 1; i < args.Length; i++)
argsMatch &= arg_type_match (delargs [i - 1].ParameterType, args [i].ParameterType);
delegate_data.curried_first_arg = true;
}
} else {
if (!method.IsStatic) {
if (args.Length + 1 == delargs.Length) {
// The first argument should match this
argsMatch = arg_type_match_this (delargs [0].ParameterType, method.DeclaringType, false);
for (int i = 0; i < args.Length; i++)
argsMatch &= arg_type_match (delargs [i + 1].ParameterType, args [i].ParameterType);
} else {
// closed over a null reference
argsMatch = allowClosed;
for (int i = 0; i < args.Length; i++)
argsMatch &= arg_type_match (delargs [i].ParameterType, args [i].ParameterType);
}
} else {
if (delargs.Length + 1 == args.Length) {
// closed over a null reference
argsMatch = !(args [0].ParameterType.IsValueType || args [0].ParameterType.IsByRef) && allowClosed;
for (int i = 0; i < delargs.Length; i++)
argsMatch &= arg_type_match (delargs [i].ParameterType, args [i + 1].ParameterType);
delegate_data.curried_first_arg = true;
} else {
argsMatch = true;
for (int i = 0; i < args.Length; i++)
argsMatch &= arg_type_match (delargs [i].ParameterType, args [i].ParameterType);
}
}
}
if (!argsMatch) {
if (throwOnBindFailure)
throw new ArgumentException ("method arguments are incompatible");
else
return null;
}
Delegate d = CreateDelegate_internal (type, target, method, throwOnBindFailure);
if (d != null)
d.original_method_info = method;
if (delegate_data != null)
d.data = delegate_data;
return d;
}
public static Delegate CreateDelegate (Type type, object firstArgument, MethodInfo method)
{
return CreateDelegate (type, firstArgument, method, true, true);
}
public static Delegate CreateDelegate (Type type, MethodInfo method, bool throwOnBindFailure)
{
return CreateDelegate (type, null, method, throwOnBindFailure, false);
}
public static Delegate CreateDelegate (Type type, MethodInfo method)
{
return CreateDelegate (type, method, true);
}
public static Delegate CreateDelegate (Type type, object target, string method)
{
return CreateDelegate (type, target, method, false);
}
static MethodInfo GetCandidateMethod (Type type, Type target, string method, BindingFlags bflags, bool ignoreCase, bool throwOnBindFailure)
{
if (type == null)
throw new ArgumentNullException ("type");
if (method == null)
throw new ArgumentNullException ("method");
if (!type.IsSubclassOf (typeof (MulticastDelegate)))
throw new ArgumentException ("type is not subclass of MulticastDelegate.");
MethodInfo invoke = type.GetMethod ("Invoke");
ParameterInfo [] delargs = invoke.GetParametersInternal ();
Type[] delargtypes = new Type [delargs.Length];
for (int i=0; i<delargs.Length; i++)
delargtypes [i] = delargs [i].ParameterType;
/*
* FIXME: we should check the caller has reflection permission
* or if it lives in the same assembly...
*/
/*
* since we need to walk the inheritance chain anyway to
* find private methods, adjust the bindingflags to ignore
* inherited methods
*/
BindingFlags flags = BindingFlags.ExactBinding |
BindingFlags.Public | BindingFlags.NonPublic |
BindingFlags.DeclaredOnly | bflags;
if (ignoreCase)
flags |= BindingFlags.IgnoreCase;
MethodInfo info = null;
for (Type targetType = target; targetType != null; targetType = targetType.BaseType) {
MethodInfo mi = targetType.GetMethod (method, flags,
null, delargtypes, EmptyArray<ParameterModifier>.Value);
if (mi != null && return_type_match (invoke.ReturnType, mi.ReturnType)) {
info = mi;
break;
}
}
if (info == null) {
if (throwOnBindFailure)
throw new ArgumentException ("Couldn't bind to method '" + method + "'.");
else
return null;
}
return info;
}
public static Delegate CreateDelegate (Type type, Type target, string method, bool ignoreCase, bool throwOnBindFailure)
{
if (target == null)
throw new ArgumentNullException ("target");
MethodInfo info = GetCandidateMethod (type, target, method,
BindingFlags.Static, ignoreCase, throwOnBindFailure);
if (info == null)
return null;
return CreateDelegate_internal (type, null, info, throwOnBindFailure);
}
public static Delegate CreateDelegate (Type type, Type target, string method) {
return CreateDelegate (type, target, method, false, true);
}
public static Delegate CreateDelegate (Type type, Type target, string method, bool ignoreCase) {
return CreateDelegate (type, target, method, ignoreCase, true);
}
public static Delegate CreateDelegate (Type type, object target, string method, bool ignoreCase, bool throwOnBindFailure)
{
if (target == null)
throw new ArgumentNullException ("target");
MethodInfo info = GetCandidateMethod (type, target.GetType (), method,
BindingFlags.Instance, ignoreCase, throwOnBindFailure);
if (info == null)
return null;
return CreateDelegate_internal (type, target, info, throwOnBindFailure);
}
public static Delegate CreateDelegate (Type type, object target, string method, bool ignoreCase) {
return CreateDelegate (type, target, method, ignoreCase, true);
}
public object DynamicInvoke (params object[] args)
{
return DynamicInvokeImpl (args);
}
void InitializeDelegateData ()
{
DelegateData delegate_data = new DelegateData ();
if (method_info.IsStatic) {
if (m_target != null) {
delegate_data.curried_first_arg = true;
} else {
MethodInfo invoke = GetType ().GetMethod ("Invoke");
if (invoke.GetParametersCount () + 1 == method_info.GetParametersCount ())
delegate_data.curried_first_arg = true;
}
}
this.data = delegate_data;
}
protected virtual object DynamicInvokeImpl (object[] args)
{
if (Method == null) {
Type[] mtypes = new Type [args.Length];
for (int i = 0; i < args.Length; ++i) {
mtypes [i] = args [i].GetType ();
}
method_info = m_target.GetType ().GetMethod (data.method_name, mtypes);
}
var target = m_target;
if (this.data == null)
InitializeDelegateData ();
if (Method.IsStatic) {
//
// The delegate is bound to m_target
//
if (data.curried_first_arg) {
if (args == null) {
args = new [] { target };
} else {
Array.Resize (ref args, args.Length + 1);
Array.Copy (args, 0, args, 1, args.Length - 1);
args [0] = target;
}
target = null;
}
} else {
if (m_target == null && args != null && args.Length > 0) {
target = args [0];
Array.Copy (args, 1, args, 0, args.Length - 1);
Array.Resize (ref args, args.Length - 1);
}
}
return Method.Invoke (target, args);
}
public virtual object Clone ()
{
return MemberwiseClone ();
}
public override bool Equals (object obj)
{
Delegate d = obj as Delegate;
if (d == null)
return false;
// Do not compare method_ptr, since it can point to a trampoline
if (d.m_target == m_target && d.Method == Method) {
if (d.data != null || data != null) {
/* Uncommon case */
if (d.data != null && data != null)
return (d.data.target_type == data.target_type && d.data.method_name == data.method_name);
else {
if (d.data != null)
return d.data.target_type == null;
if (data != null)
return data.target_type == null;
return false;
}
}
return true;
}
return false;
}
public override int GetHashCode ()
{
MethodInfo m;
m = Method;
return (m != null ? m.GetHashCode () : GetType ().GetHashCode ()) ^ RuntimeHelpers.GetHashCode (m_target);
}
protected virtual MethodInfo GetMethodImpl ()
{
if (method_info != null) {
return method_info;
} else {
if (method != IntPtr.Zero) {
if (!method_is_virtual)
method_info = (MethodInfo)MethodBase.GetMethodFromHandleNoGenericCheck (new RuntimeMethodHandle (method));
else
method_info = GetVirtualMethod_internal ();
}
return method_info;
}
}
// This is from ISerializable
public virtual void GetObjectData (SerializationInfo info, StreamingContext context)
{
DelegateSerializationHolder.GetDelegateData (this, info, context);
}
public virtual Delegate[] GetInvocationList()
{
return new Delegate[] { this };
}
/// <symmary>
/// Returns a new MulticastDelegate holding the
/// concatenated invocation lists of MulticastDelegates a and b
/// </symmary>
public static Delegate Combine (Delegate a, Delegate b)
{
if (a == null)
return b;
if (b == null)
return a;
if (a.GetType () != b.GetType ())
throw new ArgumentException (Locale.GetText ("Incompatible Delegate Types. First is {0} second is {1}.", a.GetType ().FullName, b.GetType ().FullName));
return a.CombineImpl (b);
}
/// <symmary>
/// Returns a new MulticastDelegate holding the
/// concatenated invocation lists of an Array of MulticastDelegates
/// </symmary>
[System.Runtime.InteropServices.ComVisible (true)]
public static Delegate Combine (params Delegate[] delegates)
{
if (delegates == null)
return null;
Delegate retval = null;
foreach (Delegate next in delegates)
retval = Combine (retval, next);
return retval;
}
protected virtual Delegate CombineImpl (Delegate d)
{
throw new MulticastNotSupportedException (String.Empty);
}
public static Delegate Remove (Delegate source, Delegate value)
{
if (source == null)
return null;
if (value == null)
return source;
if (source.GetType () != value.GetType ())
throw new ArgumentException (Locale.GetText ("Incompatible Delegate Types. First is {0} second is {1}.", source.GetType ().FullName, value.GetType ().FullName));
return source.RemoveImpl (value);
}
protected virtual Delegate RemoveImpl (Delegate d)
{
if (this.Equals (d))
return null;
return this;
}
public static Delegate RemoveAll (Delegate source, Delegate value)
{
Delegate tmp = source;
while ((source = Delegate.Remove (source, value)) != tmp)
tmp = source;
return tmp;
}
public static bool operator == (Delegate d1, Delegate d2)
{
if ((object)d1 == null) {
if ((object)d2 == null)
return true;
return false;
} else if ((object) d2 == null)
return false;
return d1.Equals (d2);
}
public static bool operator != (Delegate d1, Delegate d2)
{
return !(d1 == d2);
}
internal bool IsTransparentProxy ()
{
#if DISABLE_REMOTING
return false;
#else
return RemotingServices.IsTransparentProxy (m_target);
#endif
}
internal static Delegate CreateDelegateNoSecurityCheck (RuntimeType type, Object firstArgument, MethodInfo method)
{
return CreateDelegate_internal (type, firstArgument, method, true);
}
/* Internal call largely inspired from MS Delegate.InternalAllocLike */
[MethodImplAttribute(MethodImplOptions.InternalCall)]
internal extern static MulticastDelegate AllocDelegateLike_internal (Delegate d);
}
}
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