Re: [Valgrind-developers] Tracing the origin of uninitialised memory

[Maurice v. d. P. <gri...@ge...>]

Hi,

I've been studying valgrind's source and I have a few questions.

1) Is it allowed to simply call VG_(synth_ccall) multiple times from=20
   within synth_LOADV for instance? I was planning something like=20
   this:

     VG_(synth_ccall) ( helper, 1, 1, argv, tagv, tv_reg,
                        regs_live_before, regs_live_after );

     UInt argv2[] =3D { a_reg,   tv_reg };
     Tag  tagv2[] =3D { RealReg, RealReg };

     VG_(synth_ccall) ( helper2, 2, 2, argv2, tagv2, INVALID_REALREG,
                        regs_live_after, regs_live_after );

2) Is there a way to get to a register itself instead of the value it
   contains, from a helper function? In helper2 I would like to somehow
   modify some information about tv_reg dependent on both tv_reg's own=20
   value and the value of a_reg.

3) Alternatively i might want to add code to do this to the first helper
   function. Is it possible to get to the register that will receive the
   return value? Or should I modify synth_ccall to receive not only the
   return value but also the extra information that needs to be remembered
   about the return value register?

I hope I'm making sense.

Best regards,
Maurice.

--=20
Maurice van der Pot

Gentoo Linux Developer   gri...@ge...     http://www.gentoo.org
Creator of BiteMe!       gri...@kf...   http://www.kfk4ever.com