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
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
|
/* Copyright (C) 1995,1996,1998,2000,2001,2003,2004 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
* License as published by the Free Software Foundation; either
* version 2.1 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
*/
#include "libguile/_scm.h"
#include "libguile/alist.h"
#include "libguile/eval.h"
#include "libguile/procs.h"
#include "libguile/gsubr.h"
#include "libguile/objects.h"
#include "libguile/smob.h"
#include "libguile/root.h"
#include "libguile/vectors.h"
#include "libguile/hashtab.h"
#include "libguile/validate.h"
#include "libguile/procprop.h"
SCM_GLOBAL_SYMBOL (scm_sym_system_procedure, "system-procedure");
SCM_GLOBAL_SYMBOL (scm_sym_arity, "arity");
SCM
scm_i_procedure_arity (SCM proc)
{
int a = 0, o = 0, r = 0;
if (SCM_IMP (proc))
return SCM_BOOL_F;
loop:
switch (SCM_TYP7 (proc))
{
case scm_tc7_subr_1o:
o = 1;
case scm_tc7_subr_0:
break;
case scm_tc7_subr_2o:
o = 1;
case scm_tc7_subr_1:
case scm_tc7_dsubr:
case scm_tc7_cxr:
a += 1;
break;
case scm_tc7_subr_2:
a += 2;
break;
case scm_tc7_subr_3:
a += 3;
break;
case scm_tc7_asubr:
case scm_tc7_rpsubr:
case scm_tc7_lsubr:
r = 1;
break;
case scm_tc7_lsubr_2:
a += 2;
r = 1;
break;
case scm_tc7_smob:
if (SCM_SMOB_APPLICABLE_P (proc))
{
int type = SCM_SMOB_DESCRIPTOR (proc).gsubr_type;
a += SCM_GSUBR_REQ (type);
o = SCM_GSUBR_OPT (type);
r = SCM_GSUBR_REST (type);
break;
}
else
{
return SCM_BOOL_F;
}
case scm_tc7_cclo:
if (scm_is_eq (SCM_CCLO_SUBR (proc), scm_f_gsubr_apply))
{
int type = scm_to_int (SCM_GSUBR_TYPE (proc));
a += SCM_GSUBR_REQ (type);
o = SCM_GSUBR_OPT (type);
r = SCM_GSUBR_REST (type);
break;
}
else
{
proc = SCM_CCLO_SUBR (proc);
a -= 1;
goto loop;
}
case scm_tc7_pws:
proc = SCM_PROCEDURE (proc);
goto loop;
case scm_tcs_closures:
proc = SCM_CLOSURE_FORMALS (proc);
if (scm_is_null (proc))
break;
while (scm_is_pair (proc))
{
++a;
proc = SCM_CDR (proc);
}
if (!scm_is_null (proc))
r = 1;
break;
case scm_tcs_struct:
if (SCM_OBJ_CLASS_FLAGS (proc) & SCM_CLASSF_PURE_GENERIC)
{
r = 1;
break;
}
else if (!SCM_I_OPERATORP (proc))
return SCM_BOOL_F;
proc = (SCM_I_ENTITYP (proc)
? SCM_ENTITY_PROCEDURE (proc)
: SCM_OPERATOR_PROCEDURE (proc));
a -= 1;
goto loop;
default:
return SCM_BOOL_F;
}
return scm_list_3 (scm_from_int (a), scm_from_int (o), scm_from_bool(r));
}
/* XXX - instead of using a stand-in value for everything except
closures, we should find other ways to store the procedure
properties for those other kinds of procedures. For example, subrs
have their own property slot, which is unused at present.
*/
static SCM
scm_stand_in_scm_proc(SCM proc)
{
SCM handle, answer;
handle = scm_hashq_get_handle (scm_stand_in_procs, proc);
if (scm_is_false (handle))
{
answer = scm_closure (scm_list_2 (SCM_EOL, SCM_BOOL_F), SCM_EOL);
scm_hashq_set_x (scm_stand_in_procs, proc, answer);
}
else
answer = SCM_CDR (handle);
return answer;
}
SCM_DEFINE (scm_procedure_properties, "procedure-properties", 1, 0, 0,
(SCM proc),
"Return @var{obj}'s property list.")
#define FUNC_NAME s_scm_procedure_properties
{
SCM_VALIDATE_PROC (1, proc);
return scm_acons (scm_sym_arity, scm_i_procedure_arity (proc),
SCM_PROCPROPS (SCM_CLOSUREP (proc)
? proc
: scm_stand_in_scm_proc (proc)));
}
#undef FUNC_NAME
SCM_DEFINE (scm_set_procedure_properties_x, "set-procedure-properties!", 2, 0, 0,
(SCM proc, SCM new_val),
"Set @var{obj}'s property list to @var{alist}.")
#define FUNC_NAME s_scm_set_procedure_properties_x
{
if (!SCM_CLOSUREP (proc))
proc = scm_stand_in_scm_proc(proc);
SCM_VALIDATE_CLOSURE (1, proc);
SCM_SETPROCPROPS (proc, new_val);
return SCM_UNSPECIFIED;
}
#undef FUNC_NAME
SCM_DEFINE (scm_procedure_property, "procedure-property", 2, 0, 0,
(SCM p, SCM k),
"Return the property of @var{obj} with name @var{key}.")
#define FUNC_NAME s_scm_procedure_property
{
SCM assoc;
if (scm_is_eq (k, scm_sym_arity))
{
SCM arity;
SCM_ASSERT (scm_is_true (arity = scm_i_procedure_arity (p)),
p, SCM_ARG1, FUNC_NAME);
return arity;
}
SCM_VALIDATE_PROC (1, p);
assoc = scm_sloppy_assq (k,
SCM_PROCPROPS (SCM_CLOSUREP (p)
? p
: scm_stand_in_scm_proc (p)));
return (SCM_NIMP (assoc) ? SCM_CDR (assoc) : SCM_BOOL_F);
}
#undef FUNC_NAME
SCM_DEFINE (scm_set_procedure_property_x, "set-procedure-property!", 3, 0, 0,
(SCM p, SCM k, SCM v),
"In @var{obj}'s property list, set the property named @var{key} to\n"
"@var{value}.")
#define FUNC_NAME s_scm_set_procedure_property_x
{
SCM assoc;
if (!SCM_CLOSUREP (p))
p = scm_stand_in_scm_proc(p);
SCM_VALIDATE_CLOSURE (1, p);
if (scm_is_eq (k, scm_sym_arity))
SCM_MISC_ERROR ("arity is a read-only property", SCM_EOL);
assoc = scm_sloppy_assq (k, SCM_PROCPROPS (p));
if (SCM_NIMP (assoc))
SCM_SETCDR (assoc, v);
else
SCM_SETPROCPROPS (p, scm_acons (k, v, SCM_PROCPROPS (p)));
return SCM_UNSPECIFIED;
}
#undef FUNC_NAME
void
scm_init_procprop ()
{
#include "libguile/procprop.x"
}
/*
Local Variables:
c-file-style: "gnu"
End:
*/
|
