diff options
Diffstat (limited to 'libguile/stacks.c')
-rw-r--r-- | libguile/stacks.c | 92 |
1 files changed, 44 insertions, 48 deletions
diff --git a/libguile/stacks.c b/libguile/stacks.c index 37a9161cd..c3ea624ce 100644 --- a/libguile/stacks.c +++ b/libguile/stacks.c @@ -95,23 +95,21 @@ stack_depth (SCM frame) * encountered. */ -static SCM +static SCM* find_prompt (SCM key) { - SCM winds; - for (winds = scm_i_dynwinds (); scm_is_pair (winds); winds = scm_cdr (winds)) - { - SCM elt = scm_car (winds); - if (SCM_PROMPT_P (elt) && scm_is_eq (SCM_PROMPT_TAG (elt), key)) - return elt; - } - scm_misc_error ("make-stack", "Prompt tag not found while narrowing stack", - scm_list_1 (key)); - return SCM_BOOL_F; /* not reached */ + SCM *fp; + + if (!scm_dynstack_find_prompt (&SCM_I_CURRENT_THREAD->dynstack, key, + NULL, &fp, NULL, NULL, NULL)) + scm_misc_error ("make-stack", "Prompt tag not found while narrowing stack", + scm_list_1 (key)); + + return fp; } static void -narrow_stack (SCM stack, long inner, SCM inner_key, long outer, SCM outer_key) +narrow_stack (SCM stack, SCM inner_cut, SCM outer_cut) { unsigned long int len; SCM frame; @@ -120,75 +118,75 @@ narrow_stack (SCM stack, long inner, SCM inner_key, long outer, SCM outer_key) frame = SCM_STACK_FRAME (stack); /* Cut inner part. */ - if (scm_is_true (scm_procedure_p (inner_key))) + if (scm_is_true (scm_procedure_p (inner_cut))) { /* Cut until the given procedure is seen. */ - for (; inner && len ; --inner) + for (; len ;) { SCM proc = scm_frame_procedure (frame); len--; frame = scm_frame_previous (frame); - if (scm_is_eq (proc, inner_key)) + if (scm_is_eq (proc, inner_cut)) break; } } - else if (scm_is_symbol (inner_key)) - { - /* Cut until the given prompt tag is seen. FIXME, assumes prompt tags are - symbols. */ - SCM prompt = find_prompt (inner_key); - for (; len; len--, frame = scm_frame_previous (frame)) - if (SCM_PROMPT_REGISTERS (prompt)->fp - == SCM_VM_FRAME_FP (frame) - SCM_VM_FRAME_OFFSET (frame)) - break; - } - else + else if (scm_is_integer (inner_cut)) { /* Cut specified number of frames. */ + long inner = scm_to_int (inner_cut); + for (; inner && len; --inner) { len--; frame = scm_frame_previous (frame); } } + else + { + /* Cut until the given prompt tag is seen. */ + SCM *fp = find_prompt (inner_cut); + for (; len; len--, frame = scm_frame_previous (frame)) + if (fp == SCM_VM_FRAME_FP (frame) - SCM_VM_FRAME_OFFSET (frame)) + break; + } SCM_SET_STACK_LENGTH (stack, len); SCM_SET_STACK_FRAME (stack, frame); /* Cut outer part. */ - if (scm_is_true (scm_procedure_p (outer_key))) + if (scm_is_true (scm_procedure_p (outer_cut))) { /* Cut until the given procedure is seen. */ - for (; outer && len ; --outer) + for (; len ;) { frame = scm_stack_ref (stack, scm_from_long (len - 1)); len--; - if (scm_is_eq (scm_frame_procedure (frame), outer_key)) + if (scm_is_eq (scm_frame_procedure (frame), outer_cut)) break; } } - else if (scm_is_symbol (outer_key)) + else if (scm_is_integer (outer_cut)) + { + /* Cut specified number of frames. */ + long outer = scm_to_int (outer_cut); + + if (outer < len) + len -= outer; + else + len = 0; + } + else { - /* Cut until the given prompt tag is seen. FIXME, assumes prompt tags are - symbols. */ - SCM prompt = find_prompt (outer_key); + /* Cut until the given prompt tag is seen. */ + SCM *fp = find_prompt (outer_cut); while (len) { frame = scm_stack_ref (stack, scm_from_long (len - 1)); len--; - if (SCM_PROMPT_REGISTERS (prompt)->fp - == SCM_VM_FRAME_FP (frame) - SCM_VM_FRAME_OFFSET (frame)) + if (fp == SCM_VM_FRAME_FP (frame) - SCM_VM_FRAME_OFFSET (frame)) break; } } - else - { - /* Cut specified number of frames. */ - if (outer < len) - len -= outer; - else - len = 0; - } SCM_SET_STACK_LENGTH (stack, len); } @@ -257,7 +255,7 @@ SCM_DEFINE (scm_make_stack, "make-stack", 1, 0, 1, SCM cont; struct scm_vm_cont *c; - cont = scm_i_vm_capture_continuation (scm_the_vm ()); + cont = scm_i_capture_current_stack (); c = SCM_VM_CONT_DATA (cont); frame = scm_c_make_frame (cont, c->fp + c->reloc, @@ -313,10 +311,8 @@ SCM_DEFINE (scm_make_stack, "make-stack", 1, 0, 1, } narrow_stack (stack, - scm_is_integer (inner_cut) ? scm_to_int (inner_cut) : n, - scm_is_integer (inner_cut) ? SCM_BOOL_T : inner_cut, - scm_is_integer (outer_cut) ? scm_to_int (outer_cut) : n, - scm_is_integer (outer_cut) ? SCM_BOOL_T : outer_cut); + inner_cut, + outer_cut); n = SCM_STACK_LENGTH (stack); } |