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* Fix a bug in scm_eval.

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This commit is contained in:
Dirk Herrmann 2000-12-15 14:00:18 +00:00
parent 3b505adf7d
commit 09074dbf9c
2 changed files with 52 additions and 2 deletions
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9
libguile/ChangeLog
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@ -1,3 +1,12 @@
2000-12-15 Dirk Herrmann <D.Herrmann@tu-bs.de>
* eval.c (change_environment, inner_eval, restore_environment):
New functions.
(scm_eval): Bring the global variable that holds the current
environment up to date when entering or leaving the scope of the
evaluated code. Thanks to Matthias Koeppe for the bug report.
2000-12-13 Dirk Herrmann <D.Herrmann@tu-bs.de>
* numbers.c (scm_init_numbers): Re-introduced bindings for

45
libguile/eval.c
View file

@ -81,6 +81,7 @@ char *alloca ();
#include <stdio.h>
#include "libguile/_scm.h"
#include "libguile/debug.h"
#include "libguile/dynwind.h"
#include "libguile/alist.h"
#include "libguile/eq.h"
#include "libguile/continuations.h"
@ -3808,15 +3809,55 @@ scm_eval_x (SCM exp, SCM module)
* environment explicit.
*/
static void
change_environment (void *data)
{
SCM pair = SCM_PACK (data);
SCM new_module = SCM_CAR (pair);
SCM old_module = scm_selected_module ();
SCM_SETCDR (pair, old_module);
scm_select_module (new_module);
}
static SCM
inner_eval (void *data)
{
SCM pair = SCM_PACK (data);
SCM exp = SCM_CAR (pair);
SCM env = SCM_CDR (pair);
SCM result = scm_i_eval (exp, env);
return result;
}
static void
restore_environment (void *data)
{
SCM pair = SCM_PACK (data);
SCM old_module = SCM_CDR (pair);
scm_select_module (old_module);
}
SCM_DEFINE (scm_eval, "eval", 2, 0, 0,
(SCM exp, SCM environment),
"Evaluate @var{exp}, a list representing a Scheme expression, in the\n"
"environment given by @var{environment specifier}.")
#define FUNC_NAME s_scm_eval
{
SCM copied_exp;
SCM env_closure;
SCM_VALIDATE_MODULE (2, environment);
return scm_i_eval (scm_copy_tree (exp),
scm_top_level_env (SCM_MODULE_EVAL_CLOSURE (environment)));
copied_exp = scm_copy_tree (exp);
env_closure = scm_top_level_env (SCM_MODULE_EVAL_CLOSURE (environment));
return scm_internal_dynamic_wind
(change_environment, inner_eval, restore_environment,
(void *) SCM_UNPACK (scm_cons (copied_exp, env_closure)),
(void *) SCM_UNPACK (scm_cons (environment, SCM_BOOL_F)));
}
#undef FUNC_NAME