Re: [Valgrind-developers] A dataflow tracer for intrusion detection

[Nicholas N. <nj...@cs...>]

On Wed, 20 Feb 2008, Olivier Sarrouy wrote:

> But how can i, at run-time, access the content of temporaries  (for example 
> to obtain the result of an Add32) ?

Temporaries don't exist at run-time as such -- they all get converted into 
real registers.  But, at instrumentation time that isn't relevant... if you 
want the value in a temporary, you just use it.  Eg. if you have

   t3 = Add32(t1, t2)

the result in t3 is accessed simply by using t3.  So you can pass it into a 
helper function, for example.

Look at Memcheck's code, and also the code after it has instrumented it 
(using --trace-flags).  Or you might find the example in 
http://www.valgrind.org/docs/valgrind2007.pdf useful.

Nick