1 files changed, 117 insertions, 0 deletions

diff --git a/OpenSim/Region/ScriptEngine/YEngine/MMRDelegateCommon.cs b/OpenSim/Region/ScriptEngine/YEngine/MMRDelegateCommon.cs
new file mode 100644
index 0000000..433062a
--- /dev/null
+++ b/OpenSim/Region/ScriptEngine/YEngine/MMRDelegateCommon.cs
@@ -0,0 +1,117 @@
+/*
+ * Copyright (c) Contributors, http://opensimulator.org/
+ * See CONTRIBUTORS.TXT for a full list of copyright holders.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above copyright
+ *       notice, this list of conditions and the following disclaimer in the
+ *       documentation and/or other materials provided with the distribution.
+ *     * Neither the name of the OpenSimulator Project nor the
+ *       names of its contributors may be used to endorse or promote products
+ *       derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+using System;
+using System.Collections.Generic;
+using System.Reflection;
+using System.Reflection.Emit;
+
+namespace OpenSim.Region.ScriptEngine.Yengine
+{
+
+    public class DelegateCommon
+    {
+        private string sig;  // rettype(arg1type,arg2type,...), eg, "void(list,string,integer)"
+        private Type type;   // resultant delegate type
+
+        private static Dictionary<string, DelegateCommon> delegateCommons = new Dictionary<string, DelegateCommon>();
+        private static Dictionary<Type, DelegateCommon> delegateCommonsBySysType = new Dictionary<Type, DelegateCommon>();
+        private static ModuleBuilder delegateModuleBuilder = null;
+        public static Type[] constructorArgTypes = new Type[] { typeof(object), typeof(IntPtr) };
+
+        private DelegateCommon()
+        {
+        }
+
+        public static Type GetType(System.Type ret, System.Type[] args, string sig)
+        {
+            DelegateCommon dc;
+            lock(delegateCommons)
+            {
+                if(!delegateCommons.TryGetValue(sig, out dc))
+                {
+                    dc = new DelegateCommon();
+                    dc.sig = sig;
+                    dc.type = CreateDelegateType(sig, ret, args);
+                    delegateCommons.Add(sig, dc);
+                    delegateCommonsBySysType.Add(dc.type, dc);
+                }
+            }
+            return dc.type;
+        }
+
+        public static Type TryGetType(string sig)
+        {
+            DelegateCommon dc;
+            lock(delegateCommons)
+            {
+                if(!delegateCommons.TryGetValue(sig, out dc))
+                    dc = null;
+            }
+            return (dc == null) ? null : dc.type;
+        }
+
+        public static string TryGetName(Type t)
+        {
+            DelegateCommon dc;
+            lock(delegateCommons)
+            {
+                if(!delegateCommonsBySysType.TryGetValue(t, out dc))
+                    dc = null;
+            }
+            return (dc == null) ? null : dc.sig;
+        }
+
+        // http://blog.bittercoder.com/PermaLink,guid,a770377a-b1ad-4590-9145-36381757a52b.aspx
+        private static Type CreateDelegateType(string name, Type retType, Type[] argTypes)
+        {
+            if(delegateModuleBuilder == null)
+            {
+                AssemblyName assembly = new AssemblyName();
+                assembly.Name = "CustomDelegateAssembly";
+                AssemblyBuilder assemblyBuilder = AppDomain.CurrentDomain.DefineDynamicAssembly(assembly, AssemblyBuilderAccess.Run);
+                delegateModuleBuilder = assemblyBuilder.DefineDynamicModule("CustomDelegateModule");
+            }
+
+            TypeBuilder typeBuilder = delegateModuleBuilder.DefineType(name,
+                TypeAttributes.Public | TypeAttributes.Sealed | TypeAttributes.Class |
+                TypeAttributes.AnsiClass | TypeAttributes.AutoClass, typeof(MulticastDelegate));
+
+            ConstructorBuilder constructorBuilder = typeBuilder.DefineConstructor(
+                MethodAttributes.RTSpecialName | MethodAttributes.HideBySig | MethodAttributes.Public,
+                CallingConventions.Standard, constructorArgTypes);
+            constructorBuilder.SetImplementationFlags(MethodImplAttributes.Runtime | MethodImplAttributes.Managed);
+
+            MethodBuilder methodBuilder = typeBuilder.DefineMethod("Invoke",
+                MethodAttributes.Public | MethodAttributes.HideBySig | MethodAttributes.NewSlot |
+                MethodAttributes.Virtual, retType, argTypes);
+            methodBuilder.SetImplementationFlags(MethodImplAttributes.Managed | MethodImplAttributes.Runtime);
+
+            return typeBuilder.CreateType();
+        }
+    }
+}