From ed0031b621c6cf8824a9a3e588426907244aeb7e Mon Sep 17 00:00:00 2001
From: Thomas Grill <xovo@users.sourceforge.net>
Date: Tue, 18 Apr 2006 01:38:08 +0000
Subject: implemented class-based method management very fast native-to-managed
 transition most of the logic transferred to the CLR side

svn path=/trunk/externals/clr/; revision=4931
---
 PureData/DynamicMethod.cs | 101 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 101 insertions(+)
 create mode 100644 PureData/DynamicMethod.cs

(limited to 'PureData/DynamicMethod.cs')

diff --git a/PureData/DynamicMethod.cs b/PureData/DynamicMethod.cs
new file mode 100644
index 0000000..749bb1a
--- /dev/null
+++ b/PureData/DynamicMethod.cs
@@ -0,0 +1,101 @@
+using System;
+using System.Reflection;
+using System.Reflection.Emit;
+
+namespace PureData
+{
+    public delegate void DynamicMethodBang(External target);
+    public delegate void DynamicMethodFloat(External target,float f);
+    public delegate void DynamicMethodSymbol(External target,Symbol s);
+    public delegate void DynamicMethodPointer(External target,Pointer p);
+    public delegate void DynamicMethodList(External target,Atom[] l);
+    public delegate void DynamicMethodAnything(External target,int i,Symbol s,Atom[] l);
+    public delegate void DynamicMethodObject(External target,int i,object o);
+
+    class DynamicMethods
+    {
+        private static Delegate CreateIntern(Delegate del, Type dyntype)
+        {
+            MethodInfo dynmethod = dyntype.GetMethod("Invoke");
+            ParameterInfo[] dynparms = dynmethod.GetParameters();
+            MethodInfo method = del.Method;
+
+#if DEBUG
+            if (dynmethod.ReturnType != typeof(void)) throw new ArgumentException("Return type must be void");
+
+            ParameterInfo[] parms = method.GetParameters();
+            int numparms = parms.Length;
+
+            if (dynparms.Length != numparms + 1) throw new ArgumentException("Number of parameters don't match");
+
+            for (int i = 0; i < numparms; ++i)
+                if (dynparms[i + 1].ParameterType != parms[i].ParameterType) throw new ArgumentException("Parameter types don't match");
+#endif
+
+            Type[] argtypes = new Type[dynparms.Length];
+            for (int i = 0; i < dynparms.Length; ++i)
+                argtypes[i] = dynparms[i].ParameterType;
+
+            // Create dynamic method and obtain its IL generator to inject code.
+            DynamicMethod dynam = new DynamicMethod("dummy", typeof(void), argtypes, typeof(DynamicMethods));
+            ILGenerator il = dynam.GetILGenerator();
+
+            #region IL Code generation
+            // If method isn't static push target instance on top of stack.
+            if (!method.IsStatic)
+                // Argument 0 of dynamic method is target instance.
+                il.Emit(OpCodes.Ldarg_0);
+
+            // Push parameters onto the stack
+            for (int i = 0; i < dynparms.Length - 1; ++i)
+                il.Emit(OpCodes.Ldarg, i + 1);
+
+            // Perform actual call.
+            // If method is not final a callvirt is required otherwise a normal call will be emitted.
+            il.Emit(method.IsFinal ? OpCodes.Call : OpCodes.Callvirt, method);
+
+            // Emit return opcode.
+            il.Emit(OpCodes.Ret);
+            #endregion
+
+            return dynam.CreateDelegate(dyntype);
+        }
+
+        #region Specialized DynamicMethod makers
+        public static DynamicMethodBang Create(Public.MethodBang method)
+        {
+            return (DynamicMethodBang)CreateIntern(method, typeof(DynamicMethodBang));
+        }
+
+        public static DynamicMethodFloat Create(Public.MethodFloat method)
+        {
+            return (DynamicMethodFloat)CreateIntern(method,typeof(DynamicMethodFloat));
+        }
+
+        public static DynamicMethodSymbol Create(Public.MethodSymbol method)
+        {
+            return (DynamicMethodSymbol)CreateIntern(method,typeof(DynamicMethodSymbol));
+        }
+
+        public static DynamicMethodPointer Create(Public.MethodPointer method)
+        {
+            return (DynamicMethodPointer)CreateIntern(method,typeof(DynamicMethodPointer));
+        }
+
+        public static DynamicMethodList Create(Public.MethodList method)
+        {
+            return (DynamicMethodList)CreateIntern(method,typeof(DynamicMethodList));
+        }
+
+        public static DynamicMethodAnything Create(Public.MethodAnything method)
+        {
+            return (DynamicMethodAnything)CreateIntern(method,typeof(DynamicMethodAnything));
+        }
+
+        public static DynamicMethodObject Create(Public.MethodObject method)
+        {
+            return (DynamicMethodObject)CreateIntern(method, typeof(DynamicMethodObject));
+        }
+        #endregion
+    }
+}
-- 
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