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actually compile start-stack to something useful

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* ice-9/boot-9.scm (start-stack): Define as a defmacro instead of an acro
  in C. We have a way to delay evaluation of the exp, after all: putting
  it in a thunk is sufficient.

* libguile/debug.h:
* libguile/debug.c (scm_sys_start_stack): Renamed from scm_start_stack,
  and exposed to the user. Takes a thunk instead of an expression +
  environment.
  (scm_m_start_stack): Remove this acro.

* module/language/scheme/translate.scm (custom-transformer-table): Remove
  the start-stack special case.
This commit is contained in:
Andy Wingo 2008-09-26 12:03:36 +02:00
parent 99b1dd09cc
commit 107139eaad
4 changed files with 14 additions and 23 deletions
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8
ice-9/boot-9.scm
View file

@ -750,6 +750,14 @@
;;; {The interpreter stack}
;;;
(defmacro start-stack (tag exp)
`(%start-stack ,tag (lambda () ,exp)))
;;; {Loading by paths}
;;;

23
libguile/debug.c
View file

@ -445,8 +445,10 @@ scm_reverse_lookup (SCM env, SCM data)
return SCM_BOOL_F;
}
SCM
scm_start_stack (SCM id, SCM exp, SCM env)
SCM_DEFINE (scm_sys_start_stack, "%start-stack", 2, 0, 0,
(SCM id, SCM thunk),
"Call @var{thunk} on an evaluator stack tagged with @var{id}.")
#define FUNC_NAME s_scm_sys_start_stack
{
SCM answer;
scm_t_debug_frame vframe;
@ -456,27 +458,12 @@ scm_start_stack (SCM id, SCM exp, SCM env)
vframe.vect = &vframe_vect_body;
vframe.vect[0].id = id;
scm_i_set_last_debug_frame (&vframe);
answer = scm_i_eval (exp, env);
answer = scm_call_0 (thunk);
scm_i_set_last_debug_frame (vframe.prev);
return answer;
}
SCM_SYNTAX(s_start_stack, "start-stack", scm_makacro, scm_m_start_stack);
static SCM
scm_m_start_stack (SCM exp, SCM env)
#define FUNC_NAME s_start_stack
{
exp = SCM_CDR (exp);
if (!scm_is_pair (exp)
|| !scm_is_pair (SCM_CDR (exp))
|| !scm_is_null (SCM_CDDR (exp)))
SCM_WRONG_NUM_ARGS ();
return scm_start_stack (scm_eval_car (exp, env), SCM_CADR (exp), env);
}
#undef FUNC_NAME
/* {Debug Objects}
*
* The debugging evaluator throws these on frame traps.

2
libguile/debug.h
View file

@ -138,7 +138,7 @@ SCM_API scm_t_bits scm_tc16_memoized;
SCM_API SCM scm_debug_object_p (SCM obj);
SCM_API SCM scm_local_eval (SCM exp, SCM env);
SCM_API SCM scm_reverse_lookup (SCM env, SCM data);
SCM_API SCM scm_start_stack (SCM info_id, SCM exp, SCM env);
SCM_API SCM scm_sys_start_stack (SCM info_id, SCM thunk);
SCM_API SCM scm_procedure_environment (SCM proc);
SCM_API SCM scm_procedure_source (SCM proc);
SCM_API SCM scm_procedure_name (SCM proc);

4
module/language/scheme/translate.scm
View file

@ -303,10 +303,6 @@
runtime)))
(else (syntax-error l "bad eval-case clause" (car in))))))))))))
;; FIXME: make this actually do something
(start-stack
((,tag ,expr) (retrans expr)))
;; FIXME: not hygienic, relies on @apply not being shadowed
(apply
(,args (retrans `(@apply ,@args))))