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ILRewriting for beginners

, 27 Sep 2012 Ms-PL
Runtime IL-Rewriting can be used to add behavior such as logging to applications, or redirect calls from one API to another. This article and accompanying source code explains how to substitute a method call at runtime.
ILRewriting_demo
ILRewriteProfiler.dll
InterceptApp.exe
InterceptLib.dll
SampleApp1.exe
ILRewriting_src
ILEmitTest
Properties
ILRewriteProfiler
exports.def
ILRewriteProfiler.vcxproj.filters
ILRewriteProfiler.vcxproj.user
InterceptApp
app.aps
app.ico
InterceptApp.vcxproj.filters
InterceptApp.vcxproj.user
InterceptLib
InterceptLib.snk
Properties
SampleApp1
Properties
SampleApp1.snk
// ----------------------------------------------------------------------------------------------
// Copyright (c) Mattias H�gstr�m.
// ----------------------------------------------------------------------------------------------
// This source code is subject to terms and conditions of the Microsoft Public License. A 
// copy of the license can be found in the License.html file at the root of this distribution. 
// If you cannot locate the Microsoft Public License, please send an email to 
// dlr@microsoft.com. By using this source code in any fashion, you are agreeing to be bound 
// by the terms of the Microsoft Public License.
// ----------------------------------------------------------------------------------------------
// You must not remove this notice, or any other, from this software.
// ----------------------------------------------------------------------------------------------

#pragma once

#include <Windows.h>

class PerformanceCounter
{
public:
   PerformanceCounter()
   {
      if (!QueryPerformanceFrequency( &m_ticksPerSecond ))
         throw "QueryPerformanceFrequency failed";
   }

   void Start()
   {
      m_start.QuadPart = 0;
      QueryPerformanceCounter( &m_start );
   }

   void Stop()
   {
      m_end.QuadPart = 0;
      QueryPerformanceCounter( &m_end );
   }

   long double GetDurationInSeconds()
   {
      return (m_end.QuadPart - m_start.QuadPart) / long double( m_ticksPerSecond.QuadPart );
   }

   long long GetDurationInTicks()
   {
      return (m_end.QuadPart - m_start.QuadPart);
   }

   long long GetTicksPerSecond()
   {
      return m_ticksPerSecond.QuadPart;
   }

private:
   LARGE_INTEGER m_start;
   LARGE_INTEGER m_end;
   LARGE_INTEGER m_ticksPerSecond;
};

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License

This article, along with any associated source code and files, is licensed under The Microsoft Public License (Ms-PL)

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About the Author

Mattias Högström
Architect Visma Software AB
Sweden Sweden
Mattias works at Visma, a leading Nordic ERP solution provider. He has good knowledge in C++/.Net development, test tool development, and debugging. His great passion is memory dump analysis. He likes giving talks and courses.

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