1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
|
/* Copyright (C) 1995,1996,1998,1999,2000,2001, 2003, 2004, 2006, 2008, 2010, 2011, 2012 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 License
* as published by the Free Software Foundation; either version 3 of
* the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301 USA
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <assert.h>
#include "libguile/_scm.h"
#include "libguile/dynstack.h"
#include "libguile/eval.h"
#include "libguile/ports.h"
#include "libguile/dynwind.h"
SCM
scm_dynamic_wind (SCM in_guard, SCM thunk, SCM out_guard)
#define FUNC_NAME "dynamic-wind"
{
SCM ans;
scm_i_thread *thread = SCM_I_CURRENT_THREAD;
SCM_ASSERT (scm_is_true (scm_thunk_p (out_guard)), out_guard,
SCM_ARG3, FUNC_NAME);
scm_call_0 (in_guard);
scm_dynstack_push_dynwind (&thread->dynstack, in_guard, out_guard);
ans = scm_call_0 (thunk);
scm_dynstack_pop (&thread->dynstack);
scm_call_0 (out_guard);
return ans;
}
#undef FUNC_NAME
void
scm_dynwind_begin (scm_t_dynwind_flags flags)
{
scm_i_thread *thread = SCM_I_CURRENT_THREAD;
scm_dynstack_push_frame (&thread->dynstack, flags);
}
void
scm_dynwind_end (void)
{
scm_dynstack_unwind_frame (&SCM_I_CURRENT_THREAD->dynstack);
}
void
scm_dynwind_unwind_handler (void (*proc) (void *), void *data,
scm_t_wind_flags flags)
{
scm_i_thread *thread = SCM_I_CURRENT_THREAD;
scm_t_dynstack *dynstack = &thread->dynstack;
scm_dynstack_push_unwinder (dynstack, flags, proc, data);
}
void
scm_dynwind_rewind_handler (void (*proc) (void *), void *data,
scm_t_wind_flags flags)
{
scm_i_thread *thread = SCM_I_CURRENT_THREAD;
scm_t_dynstack *dynstack = &thread->dynstack;
scm_dynstack_push_rewinder (dynstack, 0, proc, data);
if (flags & SCM_F_WIND_EXPLICITLY)
proc (data);
}
void
scm_dynwind_unwind_handler_with_scm (void (*proc) (SCM), SCM data,
scm_t_wind_flags flags)
{
/* FIXME: This is not a safe cast. */
scm_dynwind_unwind_handler ((scm_t_guard) proc, SCM2PTR (data), flags);
}
void
scm_dynwind_rewind_handler_with_scm (void (*proc) (SCM), SCM data,
scm_t_wind_flags flags)
{
/* FIXME: This is not a safe cast. */
scm_dynwind_rewind_handler ((scm_t_guard) proc, SCM2PTR (data), flags);
}
void
scm_dynwind_free (void *mem)
{
scm_dynwind_unwind_handler (free, mem, SCM_F_WIND_EXPLICITLY);
}
void
scm_swap_bindings (SCM vars, SCM vals)
{
SCM tmp;
while (scm_is_pair (vals))
{
tmp = SCM_VARIABLE_REF (SCM_CAR (vars));
SCM_VARIABLE_SET (SCM_CAR (vars), SCM_CAR (vals));
SCM_SETCAR (vals, tmp);
vars = SCM_CDR (vars);
vals = SCM_CDR (vals);
}
}
void
scm_init_dynwind ()
{
#include "libguile/dynwind.x"
}
/*
Local Variables:
c-file-style: "gnu"
End:
*/
|
