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expose frame-previous, once again

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* libguile/frames.h:
* libguile/frames.c (scm_frame_previous): Rename from scm_c_frame_prev,
  and expose to Scheme. Skip boot frames.

* libguile/stacks.c (stack_depth, narrow_stack, scm_make_stack)
  (scm_stack_ref): Adjust for scm_frame_previous skipping boot frames.
This commit is contained in:
Andy Wingo 2009-12-15 00:20:47 +01:00
parent 5b98517a65
commit 93dbc31b9a
3 changed files with 28 additions and 18 deletions
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23
libguile/frames.c
View file

@ -264,23 +264,34 @@ SCM_DEFINE (scm_frame_dynamic_link, "frame-dynamic-link", 1, 0, 0,
}
#undef FUNC_NAME
extern SCM
scm_c_frame_prev (SCM frame)
SCM_DEFINE (scm_frame_previous, "frame-previous", 1, 0, 0,
(SCM frame),
"")
#define FUNC_NAME s_scm_frame_previous
{
SCM *this_fp, *new_fp, *new_sp;
SCM_VALIDATE_VM_FRAME (1, frame);
again:
this_fp = SCM_VM_FRAME_FP (frame);
new_fp = SCM_FRAME_DYNAMIC_LINK (this_fp);
if (new_fp)
{ new_fp = RELOC (frame, new_fp);
new_sp = SCM_FRAME_LOWER_ADDRESS (this_fp) - 1;
return scm_c_make_frame (SCM_VM_FRAME_STACK_HOLDER (frame),
new_fp, new_sp,
SCM_FRAME_RETURN_ADDRESS (this_fp),
SCM_VM_FRAME_OFFSET (frame));
frame = scm_c_make_frame (SCM_VM_FRAME_STACK_HOLDER (frame),
new_fp, new_sp,
SCM_FRAME_RETURN_ADDRESS (this_fp),
SCM_VM_FRAME_OFFSET (frame));
if (SCM_PROGRAM_IS_BOOT (scm_frame_procedure (frame)))
goto again;
else
return frame;
}
else
return SCM_BOOL_F;
}
#undef FUNC_NAME
void