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[Frama-c-discuss] Simplifying branches

On Wed, 2011-08-17 at 16:44 +0200, Anne Pacalet wrote:
> Le 17/08/2011 16:29, Daniel Sheridan a ?crit :
> > Is it possible to access this simplification step from a plugin, or do I
> > need to write my own visitor-based implementation of it?
> 
> Maybe you should have a look at the file [src/misc/filter.ml].
> It is used by both the [sparecode] and the [slicing] plug-ins
> to filter out the unwanted parts. Maybe you can use the provided
> functor directly, or at least get inspiration of how to use a [frama_c_visitor].
> In the second case, I think that the function [optim_if]
> is what you are looking for.

Thanks for the pointer. As I am using sparecode as one of the steps in
my plugin, I would expect to get this for free. However, I see that
optim_if is never called in such a way that it interprets constant 1 --
it only eliminates the if statement if there is no condition, which
seems to occur if the if statement itself is set to non-visible. 

I see that I could use the functor to get the result that I want. But I
wonder whether this would be a useful enhancement, either in filter.ml
or in sparecode?

	Dan.