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InvokeHelpers.cs
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209 lines (180 loc) · 7.15 KB
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// Copyright (c) Microsoft Corporation. All rights reserved.
// Licensed under the MIT license.
using System;
using System.Collections.Generic;
using System.Dynamic;
using System.Linq.Expressions;
using System.Reflection;
namespace Microsoft.ClearScript.Util
{
internal static class InvokeHelpers
{
public static object InvokeMethod(IHostInvokeContext context, object target, MethodInfo method, object[] args)
{
var argList = new List<object>();
var byRefArgInfo = new List<ByRefArgItem>();
object tailArgsArg = null;
var parameters = method.GetParameters();
for (var index = 0; index < parameters.Length; index++)
{
var param = parameters[index];
if (CustomAttributes.Has<ParamArrayAttribute>(param, false))
{
if ((index != (args.Length - 1)) || !param.ParameterType.IsInstanceOfType(args[index]))
{
var tailArgType = param.ParameterType.GetElementType();
var tailArgs = Array.CreateInstance(tailArgType, args.Length - index);
for (var innerIndex = index; innerIndex < args.Length; innerIndex++)
{
var byRefArg = args[innerIndex] as IByRefArg;
if (byRefArg == null)
{
tailArgs.SetValue(GetCompatibleArg(param.Name, tailArgType, args[innerIndex]), innerIndex - index);
}
else
{
tailArgs.SetValue(GetCompatibleArg(param.Name, tailArgType, byRefArg.Value), innerIndex - index);
byRefArgInfo.Add(new ByRefArgItem(byRefArg, tailArgs, innerIndex - index));
}
}
argList.Add(tailArgs);
tailArgsArg = tailArgs;
break;
}
}
if (index < args.Length)
{
var byRefArg = args[index] as IByRefArg;
if (byRefArg == null)
{
argList.Add(GetCompatibleArg(param, args[index]));
}
else
{
argList.Add(GetCompatibleArg(param, byRefArg.Value));
byRefArgInfo.Add(new ByRefArgItem(byRefArg, null, index));
}
}
else if (param.IsOptional)
{
if (param.Attributes.HasFlag(ParameterAttributes.HasDefault))
{
try
{
argList.Add(param.DefaultValue);
}
catch (FormatException)
{
// undocumented but observed when calling HostFunctions.newVar()
argList.Add(null);
}
}
else
{
argList.Add(Missing.Value);
}
}
else
{
break;
}
}
var finalArgs = argList.ToArray();
var result = method.Invoke(target, finalArgs);
foreach (var item in byRefArgInfo)
{
var array = item.Array ?? finalArgs;
item.ByRefArg.Value = array.GetValue(item.Index);
}
for (var index = 0; index < finalArgs.Length; index++)
{
if (index >= args.Length)
{
break;
}
var finalArg = finalArgs[index];
if (ReferenceEquals(finalArg, tailArgsArg))
{
break;
}
args[index] = finalArg;
}
var type = method.ReturnType;
if (type == typeof(void))
{
return VoidResult.Value;
}
return context.Engine.PrepareResult(result, type, method.GetScriptMemberFlags(), false);
}
public static object InvokeDelegate(IHostInvokeContext context, Delegate del, object[] args)
{
return InvokeMethod(context, del, del.GetType().GetMethod("Invoke"), args);
}
public static bool TryInvokeObject(IHostInvokeContext context, object target, BindingFlags invokeFlags, object[] args, object[] bindArgs, bool tryDynamic, out object result)
{
if (target is HostTarget hostTarget)
{
if (hostTarget.TryInvoke(context, invokeFlags, args, bindArgs, out result))
{
return true;
}
if (hostTarget is HostType)
{
return false;
}
target = hostTarget.InvokeTarget;
tryDynamic = tryDynamic && typeof(IDynamicMetaObjectProvider).IsAssignableFrom(hostTarget.Type);
}
if ((target != null) && invokeFlags.HasFlag(BindingFlags.InvokeMethod))
{
if (target is ScriptItem scriptItem)
{
target = DelegateFactory.CreateFunc<object>(scriptItem.Engine, target, args.Length);
}
if (target is Delegate del)
{
result = InvokeDelegate(context, del, args);
return true;
}
if (tryDynamic)
{
if (target is IDynamicMetaObjectProvider dynamicMetaObjectProvider)
{
if (dynamicMetaObjectProvider.GetMetaObject(Expression.Constant(target)).TryInvoke(context, args, out result))
{
return true;
}
}
}
}
result = null;
return false;
}
private static object GetCompatibleArg(ParameterInfo param, object value)
{
return GetCompatibleArg(param.Name, param.ParameterType, value);
}
private static object GetCompatibleArg(string paramName, Type type, object value)
{
if (!type.IsAssignableFrom(ref value))
{
throw new ArgumentException(MiscHelpers.FormatInvariant("Invalid argument specified for parameter '{0}'", paramName));
}
return value;
}
#region Nested type: ByRefArgItem
private sealed class ByRefArgItem
{
public IByRefArg ByRefArg { get; }
public Array Array { get; }
public int Index { get; }
public ByRefArgItem(IByRefArg arg, Array array, int index)
{
ByRefArg = arg;
Array = array;
Index = index;
}
}
#endregion
}
}