moel@165: /* moel@165: moel@165: Version: MPL 1.1/GPL 2.0/LGPL 2.1 moel@165: moel@165: The contents of this file are subject to the Mozilla Public License Version moel@165: 1.1 (the "License"); you may not use this file except in compliance with moel@165: the License. You may obtain a copy of the License at moel@165: moel@165: http://www.mozilla.org/MPL/ moel@165: moel@165: Software distributed under the License is distributed on an "AS IS" basis, moel@165: WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License moel@165: for the specific language governing rights and limitations under the License. moel@165: moel@165: The Original Code is the Open Hardware Monitor code. moel@165: moel@165: The Initial Developer of the Original Code is moel@165: Michael Möller . moel@165: Portions created by the Initial Developer are Copyright (C) 2009-2010 moel@165: the Initial Developer. All Rights Reserved. moel@165: moel@165: Contributor(s): moel@165: moel@165: Alternatively, the contents of this file may be used under the terms of moel@165: either the GNU General Public License Version 2 or later (the "GPL"), or moel@165: the GNU Lesser General Public License Version 2.1 or later (the "LGPL"), moel@165: in which case the provisions of the GPL or the LGPL are applicable instead moel@165: of those above. If you wish to allow use of your version of this file only moel@165: under the terms of either the GPL or the LGPL, and not to allow others to moel@165: use your version of this file under the terms of the MPL, indicate your moel@165: decision by deleting the provisions above and replace them with the notice moel@165: and other provisions required by the GPL or the LGPL. If you do not delete moel@165: the provisions above, a recipient may use your version of this file under moel@165: the terms of any one of the MPL, the GPL or the LGPL. moel@165: moel@165: */ moel@165: moel@165: using System; moel@165: using System.Collections.Generic; moel@165: using System.Reflection; moel@165: using System.Reflection.Emit; moel@165: using System.Runtime.InteropServices; moel@165: moel@165: namespace OpenHardwareMonitor.Hardware { moel@165: moel@165: internal sealed class PInvokeDelegateFactory { moel@165: moel@165: private static AssemblyBuilder assemblyBuilder; moel@165: private static ModuleBuilder moduleBuilder; moel@165: moel@165: private static IDictionary wrapperTypes = moel@165: new Dictionary(); moel@165: moel@165: static PInvokeDelegateFactory() { moel@165: moel@165: AssemblyName assemblyName = new AssemblyName(); moel@165: assemblyName.Name = "PInvokeDelegateFactoryInternalAssembly"; moel@165: moel@165: assemblyBuilder = moel@165: AppDomain.CurrentDomain.DefineDynamicAssembly(assemblyName, moel@165: AssemblyBuilderAccess.Run); moel@165: moel@165: moduleBuilder = assemblyBuilder.DefineDynamicModule( moel@165: "PInvokeDelegateFactoryInternalModule"); moel@165: } moel@165: moel@165: private PInvokeDelegateFactory() { } moel@165: moel@165: public static void CreateDelegate(DllImportAttribute dllImportAttribute, moel@165: out T newDelegate) where T : class moel@165: { moel@165: Type wrapperType; moel@165: wrapperTypes.TryGetValue(dllImportAttribute, out wrapperType); moel@165: moel@165: if (wrapperType == null) { moel@165: wrapperType = CreateWrapperType(typeof(T), dllImportAttribute); moel@165: wrapperTypes.Add(dllImportAttribute, wrapperType); moel@165: } moel@165: moel@165: newDelegate = Delegate.CreateDelegate(typeof(T), wrapperType, moel@165: dllImportAttribute.EntryPoint) as T; moel@165: } moel@165: moel@165: moel@165: private static Type CreateWrapperType(Type delegateType, moel@165: DllImportAttribute dllImportAttribute) { moel@165: moel@165: TypeBuilder typeBuilder = moduleBuilder.DefineType( moel@165: "PInvokeDelegateFactoryInternalWrapperType" + wrapperTypes.Count); moel@165: moel@165: MethodInfo methodInfo = delegateType.GetMethod("Invoke"); moel@165: moel@165: ParameterInfo[] parameterInfos = methodInfo.GetParameters(); moel@165: int parameterCount = parameterInfos.GetLength(0); moel@165: moel@165: Type[] parameterTypes = new Type[parameterCount]; moel@165: for (int i = 0; i < parameterCount; i++) moel@165: parameterTypes[i] = parameterInfos[i].ParameterType; moel@165: moel@165: MethodBuilder methodBuilder = typeBuilder.DefinePInvokeMethod( moel@165: dllImportAttribute.EntryPoint, dllImportAttribute.Value, moel@165: MethodAttributes.Public | MethodAttributes.Static | moel@165: MethodAttributes.PinvokeImpl, CallingConventions.Standard, moel@165: methodInfo.ReturnType, parameterTypes, moel@165: dllImportAttribute.CallingConvention, moel@165: dllImportAttribute.CharSet); moel@165: moel@165: foreach (ParameterInfo parameterInfo in parameterInfos) moel@165: methodBuilder.DefineParameter(parameterInfo.Position + 1, moel@165: parameterInfo.Attributes, parameterInfo.Name); moel@165: moel@165: if (dllImportAttribute.PreserveSig) moel@165: methodBuilder.SetImplementationFlags(MethodImplAttributes.PreserveSig); moel@165: moel@165: return typeBuilder.CreateType(); moel@165: } moel@165: } moel@165: }