re: Guile 1.8 and 86_64 gcc 4

re: Guile 1.8 and 86_64 gcc 4

[Bill Schottstaedt]

Actually the only cases that need the check are SCM_CELL_OBJECT_1 and
SCM_SET_CELL_OBJECT_0.  But perhaps there's some way to embed that
asm business (in gc.h) into the SCM_VALIDATE_CELL macro.
I haven't used "asm" before, but here's a suggestion that seems to work:

  #define SCM_VALIDATE_CELL(cell, expr) ({ __asm__ __volatile__ ("" : : "g" (cell)); expr; })




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Re: Guile 1.8 and 86_64 gcc 4

[Kevin Ryde]

"Bill Schottstaedt" <bil@ccrma.Stanford.EDU> writes:
>
>   #define SCM_VALIDATE_CELL(cell, expr) ({ __asm__ __volatile__ ("" : : "g" (cell)); expr; })

The asm version of scm_remember_upto_here_1 could be made into an
expression like that "({...})", as opposed to the current "statement"
style, if that helped make it usable in macros like this.

But I don't quite follow why a remember would be wanted in
SCM_VALIDATE_CELL.  I'd have thought it was in fact a good thing if
the "cell" value went dead if not being checked.


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re: Guile 1.8 and 86_64 gcc 4

[Bill Schottstaedt]

Or even simpler, just change the SCM_VALIDATE_CELL definition in
gc.h to:

#define SCM_VALIDATE_CELL(cell, expr) (scm_remember_upto_here(cell), (expr))

This is kinda fun!



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re: Guile 1.8 and 86_64 gcc 4

[Bill Schottstaedt]

One more bit of info.  The only change needed to get the build
to run to completion is to set SCM_DEBUG_CELL_ACCESSES to 1.
The resultant guile also runs without stack overflow.



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