Re: unwind, x86, DW_CFA_GNU_args_size

[Geoffrey Keating <geoffk at apple dot com>]

On 18/08/2006, at 6:39 PM, Ian Lance Taylor wrote:

> Geoffrey Keating <geoffk@apple.com> writes:
>
> > On 18/08/2006, at 5:42 PM, Ian Lance Taylor wrote:
> >
> > ...
> > > We could change CSA so that when it combines a prologue instruction
> > > with a non-prologue instruction it sets a new flag on the  
> > > instruction,
> > > and uses a table on the side to record the original values in the
> > > instruction.
> >
> > I guess that would work; but wouldn't it be easier to just have
> > calls.c tell the dwarf output code what the right offset is?
>
> Would that actually work correctly when the stack adjustments are
> combined?  Wouldn't we get the wrong number when different stack
> adjustments were combined?

I'm not sure what you mean by 'combined' here.  At present, calls.c  
puts the size of the arguments for that call in each CALL.  What we  
could do is change it to put the size of the total arguments pushed  
so far in each CALL, even if some of those arguments will be used by  
a later call.

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