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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
* dlr@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.Runtime.CompilerServices;
using System.Reflection;
using Microsoft.Scripting.Utils;
namespace Microsoft.Scripting.Interpreter {
public static partial class DynamicInstructions {
private static Dictionary<Type, Func<CallSiteBinder, Instruction>> _factories =
new Dictionary<Type, Func<CallSiteBinder, Instruction>>();
public static Instruction MakeInstruction(Type delegateType, CallSiteBinder binder) {
Func<CallSiteBinder, Instruction> factory;
lock (_factories) {
if (!_factories.TryGetValue(delegateType, out factory)) {
if (delegateType.GetMethod("Invoke").ReturnType == typeof(void)) {
// TODO: We should generally support void returning binders but the only
// ones that exist are delete index/member who's perf isn't that critical.
return new DynamicInstructionN(delegateType, CallSite.Create(delegateType, binder), true);
}
Type instructionType = GetDynamicInstructionType(delegateType);
if (instructionType == null) {
return new DynamicInstructionN(delegateType, CallSite.Create(delegateType, binder));
}
factory = (Func<CallSiteBinder, Instruction>)Delegate.CreateDelegate(typeof(Func<CallSiteBinder, Instruction>),
instructionType.GetMethod("Factory"));
_factories[delegateType] = factory;
}
}
return factory(binder);
}
}
public class DynamicInstructionN : Instruction {
private ReflectedCaller _target;
private FieldInfo _targetField;
private CallSite _site;
private int _argCount;
private bool _isVoid;
public DynamicInstructionN(Type delegateType, CallSite site) {
var methodInfo = delegateType.GetMethod("Invoke");
_target = ReflectedCaller.Create(methodInfo);
_targetField = site.GetType().GetField("Target");
_site = site;
_argCount = methodInfo.GetParameters().Length;
}
public DynamicInstructionN(Type delegateType, CallSite site, bool isVoid)
: this(delegateType, site) {
_isVoid = isVoid;
}
public override int ProducedStack { get { return _isVoid ? 0 : 1; } }
public override int ConsumedStack { get { return _argCount-1; } }
public override int Run(InterpretedFrame frame) {
var targetDelegate = _targetField.GetValue(_site);
object[] args = new object[_argCount];
for (int i = _argCount - 1; i >= 1; i--) {
args[i] = frame.Pop();
}
args[0] = _site;
object ret = _target.InvokeInstance(targetDelegate, args);
if (!_isVoid) frame.Push(ret);
return +1;
}
public override string ToString() {
return "DynamicInstructionN(" + _site + ")";
}
}
}
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