118 lines
5.2 KiB
C#
118 lines
5.2 KiB
C#
/*
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* Copyright (c) Contributors, http://opensimulator.org/
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* See CONTRIBUTORS.TXT for a full list of copyright holders.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* * Neither the name of the OpenSimulator Project nor the
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* names of its contributors may be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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using System;
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using System.Collections.Generic;
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using System.Reflection;
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using System.Reflection.Emit;
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namespace OpenSim.Region.ScriptEngine.Yengine
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{
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public class DelegateCommon
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{
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private string sig; // rettype(arg1type,arg2type,...), eg, "void(list,string,integer)"
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private Type type; // resultant delegate type
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private static Dictionary<string, DelegateCommon> delegateCommons = new Dictionary<string, DelegateCommon>();
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private static Dictionary<Type, DelegateCommon> delegateCommonsBySysType = new Dictionary<Type, DelegateCommon>();
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private static ModuleBuilder delegateModuleBuilder = null;
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public static Type[] constructorArgTypes = new Type[] { typeof(object), typeof(IntPtr) };
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private DelegateCommon()
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{
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}
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public static Type GetType(System.Type ret, System.Type[] args, string sig)
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{
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DelegateCommon dc;
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lock(delegateCommons)
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{
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if(!delegateCommons.TryGetValue(sig, out dc))
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{
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dc = new DelegateCommon();
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dc.sig = sig;
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dc.type = CreateDelegateType(sig, ret, args);
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delegateCommons.Add(sig, dc);
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delegateCommonsBySysType.Add(dc.type, dc);
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}
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}
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return dc.type;
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}
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public static Type TryGetType(string sig)
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{
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DelegateCommon dc;
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lock(delegateCommons)
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{
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if(!delegateCommons.TryGetValue(sig, out dc))
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dc = null;
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}
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return (dc == null) ? null : dc.type;
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}
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public static string TryGetName(Type t)
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{
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DelegateCommon dc;
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lock(delegateCommons)
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{
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if(!delegateCommonsBySysType.TryGetValue(t, out dc))
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dc = null;
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}
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return (dc == null) ? null : dc.sig;
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}
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// http://blog.bittercoder.com/PermaLink,guid,a770377a-b1ad-4590-9145-36381757a52b.aspx
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private static Type CreateDelegateType(string name, Type retType, Type[] argTypes)
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{
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if(delegateModuleBuilder == null)
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{
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AssemblyName assembly = new AssemblyName();
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assembly.Name = "CustomDelegateAssembly";
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AssemblyBuilder assemblyBuilder = AppDomain.CurrentDomain.DefineDynamicAssembly(assembly, AssemblyBuilderAccess.Run);
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delegateModuleBuilder = assemblyBuilder.DefineDynamicModule("CustomDelegateModule");
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}
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TypeBuilder typeBuilder = delegateModuleBuilder.DefineType(name,
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TypeAttributes.Public | TypeAttributes.Sealed | TypeAttributes.Class |
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TypeAttributes.AnsiClass | TypeAttributes.AutoClass, typeof(MulticastDelegate));
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ConstructorBuilder constructorBuilder = typeBuilder.DefineConstructor(
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MethodAttributes.RTSpecialName | MethodAttributes.HideBySig | MethodAttributes.Public,
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CallingConventions.Standard, constructorArgTypes);
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constructorBuilder.SetImplementationFlags(MethodImplAttributes.Runtime | MethodImplAttributes.Managed);
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MethodBuilder methodBuilder = typeBuilder.DefineMethod("Invoke",
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MethodAttributes.Public | MethodAttributes.HideBySig | MethodAttributes.NewSlot |
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MethodAttributes.Virtual, retType, argTypes);
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methodBuilder.SetImplementationFlags(MethodImplAttributes.Managed | MethodImplAttributes.Runtime);
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return typeBuilder.CreateType();
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}
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}
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}
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