原文：http://blog.csdn.net/cstod/article/details/6262506

CLR Injection: Runtime Method Replacer

http://www.codeproject.com/Articles/37549/CLR-Injection-Runtime-Method-Replacer

CLR Injection: Modify IL Code during Run-time

http://www.codeproject.com/Articles/463508/NET-CLR-Injection-Modify-IL-Code-during-Run-time

我之前發(fā)過一篇叫“托管函數(shù)的掛鉤”的文章，實現(xiàn)了對MarshalByRefObject繼承樹下的實例函數(shù)的掛鉤。?

最近，在CodeProject上看到一個關于托管函數(shù)掛鉤的文章，發(fā)現(xiàn)作者的方法很好用，但是正好不能用于MarshalByRefObject繼承樹下的實例函數(shù)（作者本人并沒有發(fā)現(xiàn)這個問題），于是兩種方法正好互補。

你也許要用，我為什么要強調MarshalByRefObject繼承樹呢？這是因為非常多的類都存在于該類的繼承樹下，比如很多人習慣把代碼寫在自己的窗體類中，而Form就在MarshalByRefObject樹下，從我的實際經驗來看，它比非MarshalByRefObject繼承樹的范圍更廣。?

我對兩種代碼進行了封裝，使用時只需調用ManagedReplacer.Replace方法即可。?

說明：托管函數(shù)在第一次被調用時會被JIT成本地代碼，之后會復用被JIT的本地代碼，所以一定要在函數(shù)被JIT之前進行掛鉤，否則將無效。

參考：http://www.sysnet.pe.kr/2/0/942

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using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Reflection; using System.IO; using RuntimeHelpers = System.Runtime.CompilerServices.RuntimeHelpers; using System.Runtime.InteropServices; using System.Reflection.Emit;namespace System {public static class MethodUtil{/// <summary>/// 將源方法替換為新方法/// </summary> public static void Replace(this MethodBase source, MethodBase dest){ReplaceMethod(source, dest, false);}public static void ReplaceMethod(MethodBase source, MethodBase dest, bool isDynamicSource){if (!MethodSignaturesEqual(source, dest)){throw new ArgumentException("The method signatures are not the same.", "source");}ReplaceMethod(GetMethodAddress(source), dest, isDynamicSource);}public static void ReplaceMethod(IntPtr srcAdr, MethodBase dest, bool isDynamicSource){IntPtr destAdr = GetMethodAddress(dest);unsafe{if (IntPtr.Size == 8){ulong* d = (ulong*)destAdr.ToPointer();if (isDynamicSource == true){*d = (ulong)srcAdr.ToInt64();}else{*d = *((ulong*)srcAdr.ToPointer());}}else{uint* d = (uint*)destAdr.ToPointer();if (isDynamicSource == true){*d = (uint)srcAdr.ToInt32();}else{*d = *((uint*)srcAdr.ToPointer());}}}}public static IntPtr GetMethodAddress(MethodBase method){if ((method is DynamicMethod)){return GetDynamicMethodAddress(method);}// Prepare the method so it gets jited RuntimeHelpers.PrepareMethod(method.MethodHandle);// If 3.5 sp1 or greater than we have a different layout in memory.if (IsNet20Sp2OrGreater()){return GetMethodAddress20SP2(method);}unsafe{// Skip theseconst int skip = 10;// Read the method index.UInt64* location = (UInt64*)(method.MethodHandle.Value.ToPointer());int index = (int)(((*location) >> 32) & 0xFF);if (IntPtr.Size == 8){// Get the method tableulong* classStart = (ulong*)method.DeclaringType.TypeHandle.Value.ToPointer();ulong* address = classStart + index + skip;return new IntPtr(address);}else{// Get the method tableuint* classStart = (uint*)method.DeclaringType.TypeHandle.Value.ToPointer();uint* address = classStart + index + skip;return new IntPtr(address);}}}private static IntPtr GetDynamicMethodAddress(MethodBase method){unsafe{RuntimeMethodHandle handle = GetDynamicMethodRuntimeHandle(method);byte* ptr = (byte*)handle.Value.ToPointer();if (IsNet20Sp2OrGreater()){RuntimeHelpers.PrepareMethod(handle);return handle.GetFunctionPointer();//if (IntPtr.Size == 8)//{// ulong* address = (ulong*)ptr;// address = (ulong*)*(address + 5);// return new IntPtr(address + 12);//}//else//{// uint* address = (uint*)ptr;// address = (uint*)*(address + 5);// return new IntPtr(address + 12);//} }else{if (IntPtr.Size == 8){ulong* address = (ulong*)ptr;address += 6;return new IntPtr(address);}else{uint* address = (uint*)ptr;address += 6;return new IntPtr(address);}}}}private static RuntimeMethodHandle GetDynamicMethodRuntimeHandle(MethodBase method){RuntimeMethodHandle handle;if (Environment.Version.Major == 4){MethodInfo getMethodDescriptorInfo = typeof(DynamicMethod).GetMethod("GetMethodDescriptor",BindingFlags.NonPublic | BindingFlags.Instance);handle = (RuntimeMethodHandle)getMethodDescriptorInfo.Invoke(method, null);}else{FieldInfo fieldInfo = typeof(DynamicMethod).GetField("m_method", BindingFlags.NonPublic | BindingFlags.Instance);handle = ((RuntimeMethodHandle)fieldInfo.GetValue(method));}return handle;}private static IntPtr GetMethodAddress20SP2(MethodBase method){unsafe{return new IntPtr(((int*)method.MethodHandle.Value.ToPointer() + 2));}}private static bool MethodSignaturesEqual(MethodBase x, MethodBase y){if (x.CallingConvention != y.CallingConvention){return false;}Type returnX = GetMethodReturnType(x), returnY = GetMethodReturnType(y);if (returnX != returnY){return false;}ParameterInfo[] xParams = x.GetParameters(), yParams = y.GetParameters();if (xParams.Length != yParams.Length){return false;}for (int i = 0; i < xParams.Length; i++){if (xParams[i].ParameterType != yParams[i].ParameterType){return false;}}return true;}private static Type GetMethodReturnType(MethodBase method){MethodInfo methodInfo = method as MethodInfo;if (methodInfo == null){// Constructor info.throw new ArgumentException("Unsupported MethodBase : " + method.GetType().Name, "method");}return methodInfo.ReturnType;}private static bool IsNet20Sp2OrGreater(){if (Environment.Version.Major == 4){return true;}return Environment.Version.Major == NetFxVersions.Net20SP2.Major &&Environment.Version.MinorRevision >= NetFxVersions.Net20SP2.MinorRevision;}#region NetFxVersionspublic static class NetFxVersions{public static readonly Version Net35 = new Version(3, 5, 21022, 8);public static readonly Version Net35SP1 = new Version(3, 5, 30729, 1);public static readonly Version Net30 = new Version(3, 0, 4506, 30);public static readonly Version Net30SP1 = new Version(3, 0, 4506, 648);public static readonly Version Net30SP2 = new Version(3, 0, 4506, 2152);public static readonly Version Net20 = new Version(2, 0, 50727, 42);public static readonly Version Net20SP1 = new Version(2, 0, 50727, 1433);public static readonly Version Net20SP2 = new Version(2, 0, 50727, 3053);}#endregion} }

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devexpress patch for vs2015 packge :?devexpress.vspackage.vs2015.zip

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轉載于:https://www.cnblogs.com/zhahost/p/3660139.html

與50位技術專家面對面20年技術見證，附贈技術全景圖

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