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authorDirk Herrmann <dirk@dirk-herrmanns-seiten.de>2004-06-06 07:46:18 +0000
committerDirk Herrmann <dirk@dirk-herrmanns-seiten.de>2004-06-06 07:46:18 +0000
commit212e58ede8e7e7cc074eb90ba3eab03afdd2641c (patch)
treed58329084fdfb96ffc034a97777dcccafd0ccf7b /libguile/list.c
parent9ccea3704316ac2bdb7e0450d162a3a7c3273d95 (diff)
downloadguile-212e58ede8e7e7cc074eb90ba3eab03afdd2641c.tar.gz
* list.[ch] (scm_i_finite_list_copy): New internal function to
copy lists that are known to be finite (though not necessarily proper). * debug.c (scm_procedure_source): Don't have scm_unmemocopy treat a closure's argument list like an expression of a body. * eval.c (unmemoize_expression, unmemoize_exprs, unmemoize_and, unmemoize_begin, unmemoize_case, unmemoize_cond, unmemoize_delay, unmemoize_do, unmemoize_if, unmemoize_lambda, unmemoize_let, unmemoize_letrec, unmemoize_letstar, unmemoize_or, unmemoize_set_x, unmemoize_apply, unmemoize_atcall_cc, unmemoize_at_call_with_values, unmemoize_future, sym_atslot_ref, unmemoize_atslot_ref, sym_atslot_set_x, unmemoize_atslot_set_x, unmemoize_builtin_macro): New static functions and symbols. (scm_unmemocopy): Rewritten in terms of the above. scm_unmemocopy now has a slightly different meaning: The memoized form that is receives as its argument is now interpreted as a sequence of expressions from a body. (unmemocar, scm_unmemocar): Since the whole functionality of unmemocar and scm_unmemocar is not needed any more, scm_unmemocar has its old content back and is deprecated, while unmemocar has been removed. (SCM_BIT7): Removed. (CEVAL): For unmemoizing a single expression, call unmemoize_expression instead of scm_unmemocopy, which now expects a sequence of body expressions. Eliminated unnecessary empty environment frame when executing let* forms. Eliminated unmemoization step from evaluator.
Diffstat (limited to 'libguile/list.c')
-rw-r--r--libguile/list.c31
1 files changed, 30 insertions, 1 deletions
diff --git a/libguile/list.c b/libguile/list.c
index 71ebf6642..213613712 100644
--- a/libguile/list.c
+++ b/libguile/list.c
@@ -1,4 +1,5 @@
-/* Copyright (C) 1995,1996,1997,2000,2001, 2003, 2004 Free Software Foundation, Inc.
+/* Copyright (C) 1995,1996,1997,2000,2001,2003,2004
+ * Free Software Foundation, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
@@ -500,6 +501,34 @@ SCM_DEFINE (scm_list_head, "list-head", 2, 0, 0,
#undef FUNC_NAME
+/* Copy a list which is known to be finite. The last pair may or may not have
+ * a '() in its cdr. That is, improper lists are accepted. */
+SCM
+scm_i_finite_list_copy (SCM list)
+{
+ if (!SCM_CONSP (list))
+ {
+ return list;
+ }
+ else
+ {
+ SCM tail;
+ const SCM result = tail = scm_list_1 (SCM_CAR (list));
+ list = SCM_CDR (list);
+ while (SCM_CONSP (list))
+ {
+ const SCM new_tail = scm_list_1 (SCM_CAR (list));
+ SCM_SETCDR (tail, new_tail);
+ tail = new_tail;
+ list = SCM_CDR (list);
+ }
+ SCM_SETCDR (tail, list);
+
+ return result;
+ }
+}
+
+
SCM_DEFINE (scm_list_copy, "list-copy", 1, 0, 0,
(SCM lst),
"Return a (newly-created) copy of @var{lst}.")