■

• リフレクションによるメソッド呼び出し(MethodInfo Invoke)の高速化

public static FastInvokeHandler GetMethodInvoker(MethodInfo methodInfo) { DynamicMethod dynamicMethod = new DynamicMethod(string.Empty, typeof(object), new Type { typeof(object), typeof(object) }, methodInfo.DeclaringType.Module); ILGenerator il = dynamicMethod.GetILGenerator(); ParameterInfo ps = methodInfo.GetParameters(); Type paramTypes = new Type[ps.Length]; for (int i = 0; i < paramTypes.Length; i++) { paramTypes[i] = ps[i].ParameterType; } LocalBuilder[] locals = new LocalBuilder[paramTypes.Length]; for (int i = 0; i < paramTypes.Length; i++) { locals[i] = il.DeclareLocal(paramTypes[i]); } for (int i = 0; i < paramTypes.Length; i++) { il.Emit(OpCodes.Ldarg_1); EmitFastInt(il, i); il.Emit(OpCodes.Ldelem_Ref); EmitCastToReference(il, paramTypes[i]); il.Emit(OpCodes.Stloc, locals[i]); } il.Emit(OpCodes.Ldarg_0); for (int i = 0; i < paramTypes.Length; i++) { il.Emit(OpCodes.Ldloc, locals[i]); } il.EmitCall(OpCodes.Call, methodInfo, null); if (methodInfo.ReturnType == typeof(void)) il.Emit(OpCodes.Ldnull); else EmitBoxIfNeeded(il, methodInfo.ReturnType); il.Emit(OpCodes.Ret); FastInvokeHandler invoder = (FastInvokeHandler)dynamicMethod.CreateDelegate( typeof(FastInvokeHandler)); return invoder; }