diff options
Diffstat (limited to 'libguile/frames.c')
-rw-r--r-- | libguile/frames.c | 23 |
1 files changed, 17 insertions, 6 deletions
diff --git a/libguile/frames.c b/libguile/frames.c index e38fc00ac..80c556b45 100644 --- a/libguile/frames.c +++ b/libguile/frames.c @@ -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 |