On 03/31/2011 11:16 AM, Greicy.Costa-Marques@xxxxxxx wrote: > > Hi, Ian > >> One important question >> is going to be how you know which variable you want to duplicate. > > yes, i know which variables i want to duplicate. > >> Presumably you don't want to duplicate all variables. > > no, i want to duplicate all variables in my code. Statically-allocated, or even on-stack variables? >> Another important question is what you want to do with the >> duplicated variable. > > Because I want to harden my code. I'm working with fault injection > by software and I want to harden my code, and a way of hardening is > the duplication of variables. And as I still do not know how, I chose > to start trying for a single variable and after to use the same path > for all variables in my code. > >> If you duplicate the variable in a straightforward way, the duplicate will >> simply be removed by the optimization passes. > > I want the duplication remains after optimization. I suspect that the easiest way would be to create a volatile copy of every variable after gimplification, and then fix up all assignemnts to copy into the volatile. Andrew.
