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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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20
libguile/stacks.c
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@ -69,9 +69,8 @@ stack_depth (SCM frame, SCM *fp)
long n;
/* count frames, skipping boot frames */
for (; scm_is_true (frame) && SCM_VM_FRAME_FP (frame) > fp;
frame = scm_c_frame_prev (frame))
if (!SCM_PROGRAM_IS_BOOT (scm_frame_procedure (frame)))
++n;
frame = scm_frame_previous (frame))
++n;
return n;
}
@ -112,7 +111,7 @@ narrow_stack (SCM stack, long inner, SCM inner_key, long outer, SCM outer_key)
for (; inner && len; --inner)
{
len--;
frame = scm_c_frame_prev (frame);
frame = scm_frame_previous (frame);
}
}
else
@ -122,7 +121,7 @@ narrow_stack (SCM stack, long inner, SCM inner_key, long outer, SCM outer_key)
{
SCM proc = scm_frame_procedure (frame);
len--;
frame = scm_c_frame_prev (frame);
frame = scm_frame_previous (frame);
if (scm_is_eq (proc, inner_key))
break;
}
@ -231,6 +230,11 @@ SCM_DEFINE (scm_make_stack, "make-stack", 1, 0, 1,
/* not reached */
}
/* FIXME: is this even possible? */
if (scm_is_true (frame)
&& SCM_PROGRAM_IS_BOOT (scm_frame_procedure (frame)))
frame = scm_frame_previous (frame);
if (scm_is_false (frame))
return SCM_BOOL_F;
@ -351,11 +355,7 @@ SCM_DEFINE (scm_stack_ref, "stack-ref", 2, 0, 0,
c_index = scm_to_unsigned_integer (index, 0, SCM_STACK_LENGTH(stack)-1);
frame = SCM_STACK_FRAME (stack);
while (c_index--)
{
frame = scm_c_frame_prev (frame);
while (SCM_PROGRAM_IS_BOOT (scm_frame_procedure (frame)))
frame = scm_c_frame_prev (frame);
}
frame = scm_frame_previous (frame);
return frame;
}
#undef FUNC_NAME