DynamicOperations.cs :  » Script » IronPython » Microsoft » Scripting » Runtime » C# / CSharp Open Source

Home
C# / CSharp Open Source
1.2.6.4 mono .net core
2.2.6.4 mono core
3.Aspect Oriented Frameworks
4.Bloggers
5.Build Systems
6.Business Application
7.Charting Reporting Tools
8.Chat Servers
9.Code Coverage Tools
10.Content Management Systems CMS
11.CRM ERP
12.Database
13.Development
14.Email
15.Forum
16.Game
17.GIS
18.GUI
19.IDEs
20.Installers Generators
21.Inversion of Control Dependency Injection
22.Issue Tracking
23.Logging Tools
24.Message
25.Mobile
26.Network Clients
27.Network Servers
28.Office
29.PDF
30.Persistence Frameworks
31.Portals
32.Profilers
33.Project Management
34.RSS RDF
35.Rule Engines
36.Script
37.Search Engines
38.Sound Audio
39.Source Control
40.SQL Clients
41.Template Engines
42.Testing
43.UML
44.Web Frameworks
45.Web Service
46.Web Testing
47.Wiki Engines
48.Windows Presentation Foundation
49.Workflows
50.XML Parsers
C# / C Sharp
C# / C Sharp by API
C# / CSharp Tutorial
C# / CSharp Open Source » Script » IronPython 
IronPython » Microsoft » Scripting » Runtime » DynamicOperations.cs
/* ****************************************************************************
 *
 * 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.
 *
 *
 * ***************************************************************************/

#if !CLR2
using System.Linq.Expressions;
#else
using Microsoft.Scripting.Ast;
#endif

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Dynamic;
using System.Reflection;
using System.Runtime.CompilerServices;

using Microsoft.Contracts;
using Microsoft.Scripting.Utils;

namespace Microsoft.Scripting.Runtime{

    /// <summary>
    /// ObjectOperations provide a large catalogue of object operations such as member access, conversions, 
    /// indexing, and things like addition.  There are several introspection and tool support services available
    /// for more advanced hosts.  
    /// 
    /// You get ObjectOperation instances from ScriptEngine, and they are bound to their engines for the semantics 
    /// of the operations.  There is a default instance of ObjectOperations you can share across all uses of the 
    /// engine.  However, very advanced hosts can create new instances.
    /// </summary>
    public sealed class DynamicOperations {
        private readonly LanguageContext _lc;

        /// <summary> a dictionary of SiteKey's which are used to cache frequently used operations, logically a set </summary>
        private Dictionary<SiteKey, SiteKey> _sites = new Dictionary<SiteKey, SiteKey>();

        /// <summary> the # of sites we had created at the last cleanup </summary>
        private int LastCleanup;

        /// <summary> the total number of sites we've ever created </summary>
        private int SitesCreated;

        /// <summary> the number of sites required before we'll try cleaning up the cache... </summary>
        private const int CleanupThreshold = 20;

        /// <summary> the minimum difference between the average that is required to remove </summary>
        private const int RemoveThreshold = 2;

        /// <summary> the maximum number we'll remove on a single cache cleanup </summary>
        private const int StopCleanupThreshold = CleanupThreshold / 2;

        /// <summary> the number of sites we should clear after if we can't make progress cleaning up otherwise </summary>
        private const int ClearThreshold = 50;

        public DynamicOperations(LanguageContext lc) {
            ContractUtils.RequiresNotNull(lc, "lc");
            _lc = lc;
        }

        #region Basic Operations

        private Dictionary<int, Func<DynamicOperations, CallSiteBinder, object, object[], object>> _invokers = new Dictionary<int, Func<DynamicOperations, CallSiteBinder, object, object[], object>>();

        /// <summary>
        /// Calls the provided object with the given parameters and returns the result.
        /// 
        /// The prefered way of calling objects is to convert the object to a strongly typed delegate 
        /// using the ConvertTo methods and then invoking that delegate.
        /// </summary>
        public object Invoke(object obj, params object[] parameters) {
            return GetInvoker(parameters.Length)(this, _lc.CreateInvokeBinder(new CallInfo(parameters.Length)), obj, parameters);
        }
        
        /// <summary>
        /// Invokes a member on the provided object with the given parameters and returns the result.
        /// </summary>
        public object InvokeMember(object obj, string memberName, params object[] parameters) {
            return InvokeMember(obj, memberName, false, parameters);
        }

        /// <summary>
        /// Invokes a member on the provided object with the given parameters and returns the result.
        /// </summary>
        public object InvokeMember(object obj, string memberName, bool ignoreCase, params object[] parameters) {
            return GetInvoker(parameters.Length)(this, _lc.CreateCallBinder(memberName, ignoreCase, new CallInfo(parameters.Length)), obj, parameters);
        }

        /// <summary>
        /// Creates a new instance from the provided object using the given parameters, and returns the result.
        /// </summary>
        public object CreateInstance(object obj, params object[] parameters) {
            return GetInvoker(parameters.Length)(this, _lc.CreateCreateBinder(new CallInfo(parameters.Length)), obj, parameters);
        }

        /// <summary>
        /// Gets the member name from the object obj.  Throws an exception if the member does not exist or is write-only.
        /// </summary>
        public object GetMember(object obj, string name) {
            return GetMember(obj, name, false);
        }

        /// <summary>
        /// Gets the member name from the object obj and converts it to the type T.  Throws an exception if the
        /// member does not exist, is write-only, or cannot be converted.
        /// </summary>
        public T GetMember<T>(object obj, string name) {
            return GetMember<T>(obj, name, false);
        }

        /// <summary>
        /// Gets the member name from the object obj.  Returns true if the member is successfully retrieved and 
        /// stores the value in the value out param.
        /// </summary>
        public bool TryGetMember(object obj, string name, out object value) {
            return TryGetMember(obj, name, false, out value);
        }

        /// <summary>
        /// Returns true if the object has a member named name, false if the member does not exist.
        /// </summary>
        public bool ContainsMember(object obj, string name) {
            return ContainsMember(obj, name, false);
        }

        /// <summary>
        /// Removes the member name from the object obj.
        /// </summary>
        public void RemoveMember(object obj, string name) {
            RemoveMember(obj, name, false);
        }

        /// <summary>
        /// Sets the member name on object obj to value.
        /// </summary>
        public void SetMember(object obj, string name, object value) {
            SetMember(obj, name, value, false);
        }

        /// <summary>
        /// Sets the member name on object obj to value.  This overload can be used to avoid
        /// boxing and casting of strongly typed members.
        /// </summary>
        public void SetMember<T>(object obj, string name, T value) {
            SetMember<T>(obj, name, value, false);
        }

        /// <summary>
        /// Gets the member name from the object obj.  Throws an exception if the member does not exist or is write-only.
        /// </summary>
        public object GetMember(object obj, string name, bool ignoreCase) {
            CallSite<Func<CallSite, object, object>> site;
            site = GetOrCreateSite<object, object>(_lc.CreateGetMemberBinder(name, ignoreCase));
            return site.Target(site, obj);
        }

        /// <summary>
        /// Gets the member name from the object obj and converts it to the type T. The conversion will be explicit or implicit
        /// depending on what the langauge prefers. Throws an exception if the member does not exist, is write-only, or cannot be converted.
        /// </summary>
        public T GetMember<T>(object obj, string name, bool ignoreCase) {
            CallSite<Func<CallSite, object, T>> convertSite = GetOrCreateSite<object, T>(_lc.CreateConvertBinder(typeof(T), null));
            CallSite<Func<CallSite, object, object>> site = GetOrCreateSite<object, object>(_lc.CreateGetMemberBinder(name, ignoreCase));
            return convertSite.Target(convertSite, site.Target(site, obj));
        }

        /// <summary>
        /// Gets the member name from the object obj.  Returns true if the member is successfully retrieved and 
        /// stores the value in the value out param.
        /// </summary>
        public bool TryGetMember(object obj, string name, bool ignoreCase, out object value) {
            try {
                value = GetMember(obj, name, ignoreCase);
                return true;
            } catch (MissingMemberException) {
                value = null;
                return false;
            }
        }

        /// <summary>
        /// Returns true if the object has a member named name, false if the member does not exist.
        /// </summary>
        public bool ContainsMember(object obj, string name, bool ignoreCase) {
            object dummy;
            return TryGetMember(obj, name, ignoreCase, out dummy);
        }

        /// <summary>
        /// Removes the member name from the object obj.  Returns true if the member was successfully removed
        /// or false if the member does not exist.
        /// </summary>
        public void RemoveMember(object obj, string name, bool ignoreCase) {
            CallSite<Action<CallSite, object>> site;
            site = GetOrCreateActionSite<object>(_lc.CreateDeleteMemberBinder(name, ignoreCase));
            site.Target(site, obj);
        }

        /// <summary>
        /// Sets the member name on object obj to value.
        /// </summary>
        public void SetMember(object obj, string name, object value, bool ignoreCase) {
            CallSite<Func<CallSite, object, object, object>> site;
            site = GetOrCreateSite<object, object, object>(_lc.CreateSetMemberBinder(name, ignoreCase));
            site.Target(site, obj, value);
        }

        /// <summary>
        /// Sets the member name on object obj to value.  This overload can be used to avoid
        /// boxing and casting of strongly typed members.
        /// </summary>
        public void SetMember<T>(object obj, string name, T value, bool ignoreCase) {
            CallSite<Func<CallSite, object, T, object>> site;
            site = GetOrCreateSite<object, T, object>(_lc.CreateSetMemberBinder(name, ignoreCase));
            site.Target(site, obj, value);
        }

        /// <summary>
        /// Converts the object obj to the type T.  The conversion will be explicit or implicit
        /// depending on what the langauge prefers.
        /// </summary>
        public T ConvertTo<T>(object obj) {
            CallSite<Func<CallSite, object, T>> site;
            site = GetOrCreateSite<object, T>(_lc.CreateConvertBinder(typeof(T), null));
            return site.Target(site, obj);
        }

        /// <summary> 
        /// Converts the object obj to the type type.  The conversion will be explicit or implicit
        /// depending on what the langauge prefers.
        /// </summary>
        public object ConvertTo(object obj, Type type) {
            if (type.IsInterface || type.IsClass) {
                CallSite<Func<CallSite, object, object>> site;
                site = GetOrCreateSite<object, object>(_lc.CreateConvertBinder(type, null));
                return site.Target(site, obj);
            }

            // TODO: We should probably cache these instead of using reflection all the time.
            foreach (MethodInfo mi in typeof(DynamicOperations).GetMember("ConvertTo")) {
                if (mi.IsGenericMethod) {
                    try {
                        return mi.MakeGenericMethod(type).Invoke(this, new object[] { obj });
                    } catch(TargetInvocationException tie) {
                        throw tie.InnerException;
                    }
                }
            }

            throw new InvalidOperationException();
        }

        /// <summary>
        /// Converts the object obj to the type T.  Returns true if the value can be converted, false if it cannot.
        /// 
        /// The conversion will be explicit or implicit depending on what the langauge prefers.
        /// </summary>
        public bool TryConvertTo<T>(object obj, out T result) {
            try {
                result = ConvertTo<T>(obj);
                return true;
            } catch (ArgumentTypeException) {
                result = default(T);
                return false;
            } catch (InvalidCastException) {
                result = default(T);
                return false;
            }
        }

        /// <summary>
        /// Converts the object obj to the type type.  Returns true if the value can be converted, false if it cannot.
        /// 
        /// The conversion will be explicit or implicit depending on what the langauge prefers.
        /// </summary>
        public bool TryConvertTo(object obj, Type type, out object result) {
            try {
                result = ConvertTo(obj, type);
                return true;
            } catch (ArgumentTypeException) {
                result = null;
                return false;
            } catch (InvalidCastException) {
                result = null;
                return false;
            }
        }

        /// <summary>
        /// Convers the object obj to the type T including explicit conversions which may lose information.
        /// </summary>
        public T ExplicitConvertTo<T>(object obj) {
            CallSite<Func<CallSite, object, T>> site;
            site = GetOrCreateSite<object, T>(_lc.CreateConvertBinder(typeof(T), true));
            return site.Target(site, obj);
        }

        /// <summary>
        /// Converts the object obj to the type type including explicit conversions which may lose information.
        /// </summary>
        public object ExplicitConvertTo(object obj, Type type) {
            CallSite<Func<CallSite, object, object>> site;
            site = GetOrCreateSite<object, object>(_lc.CreateConvertBinder(type, true));
            return site.Target(site, obj);
        }

        /// <summary>
        /// Converts the object obj to the type type including explicit conversions which may lose information.  
        /// 
        /// Returns true if the value can be converted, false if it cannot.
        /// </summary>
        public bool TryExplicitConvertTo(object obj, Type type, out object result) {
            try {
                result = ExplicitConvertTo(obj, type);
                return true;
            } catch (ArgumentTypeException) {
                result = null;
                return false;
            } catch (InvalidCastException) {
                result = null;
                return false;
            }
        }

        /// <summary>
        /// Converts the object obj to the type T.  Returns true if the value can be converted, false if it cannot.
        /// </summary>
        public bool TryExplicitConvertTo<T>(object obj, out T result) {
            try {
                result = ExplicitConvertTo<T>(obj);
                return true;
            } catch (ArgumentTypeException) {
                result = default(T);
                return false;
            } catch (InvalidCastException) {
                result = default(T);
                return false;
            }
        }

        /// <summary>
        /// Convers the object obj to the type T including implicit conversions.
        /// </summary>
        public T ImplicitConvertTo<T>(object obj) {
            CallSite<Func<CallSite, object, T>> site;
            site = GetOrCreateSite<object, T>(_lc.CreateConvertBinder(typeof(T), false));
            return site.Target(site, obj);
        }

        /// <summary>
        /// Converts the object obj to the type type including implicit conversions.
        /// </summary>
        public object ImplicitConvertTo(object obj, Type type) {
            CallSite<Func<CallSite, object, object>> site;
            site = GetOrCreateSite<object, object>(_lc.CreateConvertBinder(type, false));
            return site.Target(site, obj);
        }

        /// <summary>
        /// Converts the object obj to the type type including implicit conversions. 
        /// 
        /// Returns true if the value can be converted, false if it cannot.
        /// </summary>
        public bool TryImplicitConvertTo(object obj, Type type, out object result) {
            try {
                result = ImplicitConvertTo(obj, type);
                return true;
            } catch (ArgumentTypeException) {
                result = null;
                return false;
            } catch (InvalidCastException) {
                result = null;
                return false;
            }
        }

        /// <summary>
        /// Converts the object obj to the type T.  Returns true if the value can be converted, false if it cannot.
        /// </summary>
        public bool TryImplicitConvertTo<T>(object obj, out T result) {
            try {
                result = ImplicitConvertTo<T>(obj);
                return true;
            } catch (ArgumentTypeException) {
                result = default(T);
                return false;
            } catch (InvalidCastException) {
                result = default(T);
                return false;
            }
        }

        /// <summary>
        /// Performs a generic unary operation on the strongly typed target and returns the value as the specified type
        /// </summary>
        public TResult DoOperation<TTarget, TResult>(ExpressionType operation, TTarget target) {
            var site = GetOrCreateSite<TTarget, TResult>(_lc.CreateUnaryOperationBinder(operation));
            return site.Target(site, target);
        }

        /// <summary>
        /// Peforms the generic binary operation on the specified strongly typed targets and returns
        /// the strongly typed result.
        /// </summary>
        public TResult DoOperation<TTarget, TOther, TResult>(ExpressionType operation, TTarget target, TOther other) {
            var site = GetOrCreateSite<TTarget, TOther, TResult>(_lc.CreateBinaryOperationBinder(operation));
            return site.Target(site, target, other);
        }
        
        public string GetDocumentation(object o) {
            return _lc.GetDocumentation(o);
        }

        public IList<string> GetCallSignatures(object o) {
            return _lc.GetCallSignatures(o);
        }

        public bool IsCallable(object o) {
            return _lc.IsCallable(o);
        }
        
        /// <summary>
        /// Returns a list of strings which contain the known members of the object.
        /// </summary>
        public IList<string> GetMemberNames(object obj) {
            return _lc.GetMemberNames(obj);
        }

        /// <summary>
        /// Returns a string representation of the object in a language specific object display format.
        /// </summary>
        public string Format(object obj) {
            return _lc.FormatObject(this, obj);
        }

        #endregion

        #region Private implementation details

        /// <summary>
        /// Gets or creates a dynamic site w/ the specified type parameters for the provided binder.
        /// </summary>
        /// <remarks>
        /// This will either get the site from the cache or create a new site and return it. The cache
        /// may be cleaned if it's gotten too big since the last usage.
        /// </remarks>
        public CallSite<Func<CallSite, T1, TResult>> GetOrCreateSite<T1, TResult>(CallSiteBinder siteBinder) {
            return GetOrCreateSite<CallSite<Func<CallSite, T1, TResult>>>(siteBinder, CallSite<Func<CallSite, T1, TResult>>.Create);
        }

        /// <summary>
        /// Gets or creates a dynamic site w/ the specified type parameters for the provided binder.
        /// </summary>
        /// <remarks>
        /// This will either get the site from the cache or create a new site and return it. The cache
        /// may be cleaned if it's gotten too big since the last usage.
        /// </remarks>
        public CallSite<Action<CallSite, T1>> GetOrCreateActionSite<T1>(CallSiteBinder siteBinder) {
            return GetOrCreateSite<CallSite<Action<CallSite, T1>>>(siteBinder, CallSite<Action<CallSite, T1>>.Create);
        }

        /// <summary>
        /// Gets or creates a dynamic site w/ the specified type parameters for the provided binder.
        /// </summary>
        /// <remarks>
        /// This will either get the site from the cache or create a new site and return it. The cache
        /// may be cleaned if it's gotten too big since the last usage.
        /// </remarks>
        public CallSite<Func<CallSite, T1, T2, TResult>> GetOrCreateSite<T1, T2, TResult>(CallSiteBinder siteBinder) {
            return GetOrCreateSite<CallSite<Func<CallSite, T1, T2, TResult>>>(siteBinder, CallSite<Func<CallSite, T1, T2, TResult>>.Create);
        }

        /// <summary>
        /// Gets or creates a dynamic site w/ the specified type parameters for the provided binder.
        /// </summary>
        /// <remarks>
        /// This will either get the site from the cache or create a new site and return it. The cache
        /// may be cleaned if it's gotten too big since the last usage.
        /// </remarks>
        public CallSite<Func<CallSite, T1, T2, T3, TResult>> GetOrCreateSite<T1, T2, T3, TResult>(CallSiteBinder siteBinder) {
            return GetOrCreateSite<CallSite<Func<CallSite, T1, T2, T3, TResult>>>(siteBinder, CallSite<Func<CallSite, T1, T2, T3, TResult>>.Create);
        }

        /// <summary>
        /// Gets or creates a dynamic site w/ the specified type parameters for the provided binder.
        /// </summary>
        /// <remarks>
        /// This will either get the site from the cache or create a new site and return it. The cache
        /// may be cleaned if it's gotten too big since the last usage.
        /// </remarks>
        public CallSite<TSiteFunc> GetOrCreateSite<TSiteFunc>(CallSiteBinder siteBinder) where TSiteFunc : class {
            return GetOrCreateSite<CallSite<TSiteFunc>>(siteBinder, CallSite<TSiteFunc>.Create);
        }

        /// <summary>
        /// Helper to create to get or create the dynamic site - called by the GetSite methods.
        /// </summary>
        private T GetOrCreateSite<T>(CallSiteBinder siteBinder, Func<CallSiteBinder, T> factory) where T : CallSite {
            SiteKey sk = new SiteKey(typeof(T), siteBinder);

            lock (_sites) {
                SiteKey old;
                if (!_sites.TryGetValue(sk, out old)) {
                    SitesCreated++;
                    if (SitesCreated < 0) {
                        // overflow, just reset back to zero...
                        SitesCreated = 0;
                        LastCleanup = 0;
                    }
                    sk.Site = factory(sk.SiteBinder);
                    _sites[sk] = sk;
                } else {
                    sk = old;
                }

                sk.HitCount++;

                CleanupNoLock();
            }

            return (T)sk.Site;
        }

        /// <summary>
        /// Removes items from the cache that have the lowest usage...
        /// </summary>
        private void CleanupNoLock() {
            // cleanup only if we have too many sites and we've created a bunch since our last cleanup
            if (_sites.Count > CleanupThreshold && (LastCleanup < SitesCreated - CleanupThreshold)) {
                LastCleanup = SitesCreated;

                // calculate the average use, remove up to StopCleanupThreshold that are below average.
                int totalUse = 0;
                foreach (SiteKey sk in _sites.Keys) {
                    totalUse += sk.HitCount;
                }

                int avgUse = totalUse / _sites.Count;
                if (avgUse == 1 && _sites.Count > ClearThreshold) {
                    // we only have a bunch of one-off requests
                    _sites.Clear();
                    return;
                }

                List<SiteKey> toRemove = null;
                foreach (SiteKey sk in _sites.Keys) {
                    if (sk.HitCount < (avgUse - RemoveThreshold)) {
                        if (toRemove == null) {
                            toRemove = new List<SiteKey>();
                        }

                        toRemove.Add(sk);
                        if (toRemove.Count > StopCleanupThreshold) {
                            // if we have a setup like weight(100), weight(1), weight(1), weight(1), ... we don't want
                            // to just run through and remove all of the weight(1)'s. 
                            break;
                        }
                    }

                }

                if (toRemove != null) {
                    foreach (SiteKey sk in toRemove) {
                        _sites.Remove(sk);
                    }

                    // reset all hit counts so the next time through is fair 
                    // to newly added members which may take precedence.
                    foreach (SiteKey sk in _sites.Keys) {
                        sk.HitCount = 0;
                    }
                }
            }
        }

        /// <summary>
        /// Helper class for tracking all of our unique dynamic sites and their
        /// usage patterns.  We hash on the combination of the binder and site type.
        /// 
        /// We also track the hit count and the key holds the site associated w/ the 
        /// key.  Logically this is a set based upon the binder and site-type but we
        /// store it in a dictionary.
        /// </summary>
        private class SiteKey : IEquatable<SiteKey> {
            // the key portion of the data
            internal readonly CallSiteBinder SiteBinder;
            private readonly Type _siteType;

            // not used for equality, used for caching strategy
            public int HitCount;
            public CallSite Site;

            public SiteKey(Type siteType, CallSiteBinder siteBinder) {
                Debug.Assert(siteType != null);
                Debug.Assert(siteBinder != null);

                SiteBinder = siteBinder;
                _siteType = siteType;
            }

            [Confined]
            public override bool Equals(object obj) {
                return Equals(obj as SiteKey);
            }

            [Confined]
            public override int GetHashCode() {
                return SiteBinder.GetHashCode() ^ _siteType.GetHashCode();
            }

            #region IEquatable<SiteKey> Members

            [StateIndependent]
            public bool Equals(SiteKey other) {
                if (other == null) return false;

                return other.SiteBinder.Equals(SiteBinder) &&
                    other._siteType == _siteType;
            }

            #endregion
#if DEBUG
            [Confined]
            public override string ToString() {
                return String.Format("{0} {1}", SiteBinder.ToString(), HitCount);
            }
#endif
        }

        private Func<DynamicOperations, CallSiteBinder, object, object[], object> GetInvoker(int paramCount) {
            Func<DynamicOperations, CallSiteBinder, object, object[], object> invoker;
            lock (_invokers) {
                if (!_invokers.TryGetValue(paramCount, out invoker)) {
                    ParameterExpression dynOps = Expression.Parameter(typeof(DynamicOperations));
                    ParameterExpression callInfo = Expression.Parameter(typeof(CallSiteBinder));
                    ParameterExpression target = Expression.Parameter(typeof(object));
                    ParameterExpression args = Expression.Parameter(typeof(object[]));
                    Type funcType = ReflectionUtils.GetObjectCallSiteDelegateType(paramCount);
                    ParameterExpression site = Expression.Parameter(typeof(CallSite<>).MakeGenericType(funcType));
                    Expression[] siteArgs = new Expression[paramCount + 2];
                    siteArgs[0] = site;
                    siteArgs[1] = target;
                    for (int i = 0; i < paramCount; i++) {
                        siteArgs[i + 2] = Expression.ArrayIndex(args, Expression.Constant(i));
                    }

                    var getOrCreateSiteFunc = new Func<CallSiteBinder, CallSite<Func<object>>>(GetOrCreateSite<Func<object>>).Method.GetGenericMethodDefinition();
                    _invokers[paramCount] = invoker = Expression.Lambda<Func<DynamicOperations, CallSiteBinder, object, object[], object>>(
                        Expression.Block(
                            new[] { site },
                            Expression.Assign(
                                site,
                                Expression.Call(dynOps, getOrCreateSiteFunc.MakeGenericMethod(funcType), callInfo)
                            ),
                            Expression.Invoke(
                                Expression.Field(
                                    site,
                                    site.Type.GetField("Target")
                                ),
                                siteArgs
                            )
                        ),
                        new[] { dynOps, callInfo, target, args }
                    ).Compile();
                }
            }
            return invoker;
        }
       
        #endregion
    }
}
www.java2v.com | Contact Us
Copyright 2009 - 12 Demo Source and Support. All rights reserved.
All other trademarks are property of their respective owners.