[CM] C Stack Unwinding

[Woody Douglass]

I think i may have solved the issue i mentioned below. It looks like a
catch always needs to carry a jmp_buf pointer, so that nested eval
statements are handled properly. consider the attached patch, and the C
file that tests it.

Thanks,
Woody

On Wed, 2021-11-10 at 21:23 +0000, Woody Douglass wrote:
> Cool! thanks so much!
> 
> One thing I have noticed in my testing today is that
> 
>     result1 = s7_call_with_catch(s, tag, make_func, catch);
> 
> behaves differently from
> 
>     result1 = s7_eval_c_string(s, "(catch #t bad-func error-
> handler)");
> 
> now. I suspect that one (or more) of the 
> 
>     catch_cstack(p) = NULL;
> 
> lines i added to s7.c needs to change, but i'm not sure which (all?)
> 
> I'll have more information in the morning, i'm still wrapping my head
> around it. Thanks again for merging!
> 
> -Woody
> 
> On Wed, 2021-11-10 at 13:08 -0800, bil at ccrma.Stanford.EDU wrote:
> > I merged in your changes, and they pass all my bazillion
> > tests.  One timing test is 2% slower -- callgrind
> > blames fprintf, but there is no fprintf!  I made other
> > changes, so this is probably something unrelated to
> > your code.  Thanks again for the improvement!
> > 
> 
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