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/* ****************************************************************************
*
* Copyright (c) Microsoft Corporation.
*
* This source code is subject to terms and conditions of the Microsoft Public License. A
* copy of the license can be found in the License.html file at the root of this distribution. If
* you cannot locate the Microsoft Public License, please send an email to
* ironpy@microsoft.com. By using this source code in any fashion, you are agreeing to be bound
* by the terms of the Microsoft Public License.
*
* You must not remove this notice, or any other, from this software.
*
*
* ***************************************************************************/
using System;
using System.Collections.Generic;
using System.Reflection;
using System.Reflection.Emit;
using Microsoft.Scripting.Runtime;
namespace Microsoft.Scripting.Utils {
public partial class ReflectedCaller {
internal ReflectedCaller() { }
private static readonly Dictionary<MethodInfo, ReflectedCaller> _cache = new Dictionary<MethodInfo,ReflectedCaller>();
/// <summary>
/// Creates a new ReflectedCaller which can be used to quickly invoke the provided MethodInfo.
/// </summary>
public static ReflectedCaller Create(MethodInfo info) {
if ((!info.IsStatic && info.DeclaringType.IsValueType) ||
info is System.Reflection.Emit.DynamicMethod) {
return new SlowReflectedCaller(info);
}
ParameterInfo[] pis = info.GetParameters();
int argCnt = pis.Length;
if (!info.IsStatic) argCnt++;
if (argCnt >= MaxHelpers) {
// no delegate for this size, fallback to reflection invoke
return new SlowReflectedCaller(info);
}
foreach (ParameterInfo pi in pis) {
if (pi.ParameterType.IsByRef) {
// we don't support ref args via generics.
return new SlowReflectedCaller(info);
}
}
// see if we've created one w/ a delegate
ReflectedCaller res;
if (ShouldCache(info)) {
lock (_cache) {
if (_cache.TryGetValue(info, out res)) {
return res;
}
}
}
// create it
try {
if (argCnt < MaxArgs) {
res = FastCreate(info, pis);
} else {
res = SlowCreate(info, pis);
}
} catch (TargetInvocationException tie) {
if (!(tie.InnerException is NotSupportedException)) {
throw;
}
res = new SlowReflectedCaller(info);
} catch (NotSupportedException) {
// if Delegate.CreateDelegate can't handle the method fallback to
// the slow reflection version. For example this can happen w/
// a generic method defined on an interface and implemented on a class.
res = new SlowReflectedCaller(info);
}
// cache it for future users if it's a reasonable method to cache
if (ShouldCache(info)) {
lock (_cache) {
_cache[info] = res;
}
}
return res;
}
private static bool ShouldCache(MethodInfo info) {
return !(info is DynamicMethod);
}
/// <summary>
/// Gets the next type or null if no more types are available.
/// </summary>
private static Type TryGetParameterOrReturnType(MethodInfo target, ParameterInfo[] pi, int index) {
if (!target.IsStatic) {
index--;
if (index < 0) {
return target.DeclaringType;
}
}
if (index < pi.Length) {
// next in signature
return pi[index].ParameterType;
}
if (target.ReturnType == typeof(void) || index > pi.Length) {
// no more parameters
return null;
}
// last parameter on Invoke is return type
return target.ReturnType;
}
private static bool IndexIsNotReturnType(int index, MethodInfo target, ParameterInfo[] pi) {
return pi.Length != index || (pi.Length == index && !target.IsStatic);
}
/// <summary>
/// Uses reflection to create new instance of the appropriate ReflectedCaller
/// </summary>
private static ReflectedCaller SlowCreate(MethodInfo info, ParameterInfo[] pis) {
List<Type> types = new List<Type>();
if (!info.IsStatic) types.Add(info.DeclaringType);
foreach (ParameterInfo pi in pis) {
types.Add(pi.ParameterType);
}
if (info.ReturnType != typeof(void)) {
types.Add(info.ReturnType);
}
Type[] arrTypes = types.ToArray();
return (ReflectedCaller)Activator.CreateInstance(GetHelperType(info, arrTypes), info);
}
}
sealed partial class SlowReflectedCaller : ReflectedCaller {
private MethodInfo _target;
public SlowReflectedCaller(MethodInfo target) {
_target = target;
}
public override object Invoke(params object[] args) {
return InvokeWorker(args);
}
public override object InvokeInstance(object instance, params object[] args) {
if (_target.IsStatic) {
try {
return _target.Invoke(null, args);
} catch (TargetInvocationException e) {
throw ExceptionHelpers.UpdateForRethrow(e.InnerException);
}
}
try {
return _target.Invoke(instance, args);
} catch (TargetInvocationException e) {
throw ExceptionHelpers.UpdateForRethrow(e.InnerException);
}
}
private object InvokeWorker(params object[] args) {
if (_target.IsStatic) {
try {
return _target.Invoke(null, args);
} catch (TargetInvocationException e) {
throw ExceptionHelpers.UpdateForRethrow(e.InnerException);
}
}
try {
return _target.Invoke(args[0], GetNonStaticArgs(args));
} catch (TargetInvocationException e) {
throw ExceptionHelpers.UpdateForRethrow(e.InnerException);
}
}
private static object[] GetNonStaticArgs(object[] args) {
object[] newArgs = new object[args.Length - 1];
for (int i = 0; i < newArgs.Length; i++) {
newArgs[i] = args[i + 1];
}
return newArgs;
}
}
}
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