title: Extending VC++ compiler for instrumentation
body: <p>I am very new to the windows world and development. I want to extend the VC++ compiler so that I can add some instrumentation instructions in a "pass" before creating the final shared lib. I googled somewhat, read some docs, installed Visual Studio and the compiler to play around but haven't been able to find a straightforward solution.  Any pointers will be really helpful </p>
  
  <p>Thanks</p>