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
|
/* go-reflect-map.c -- map reflection support for Go.
Copyright 2009, 2010 The Go Authors. All rights reserved.
Use of this source code is governed by a BSD-style
license that can be found in the LICENSE file. */
#include <stdlib.h>
#include <stdint.h>
#include "go-alloc.h"
#include "go-assert.h"
#include "go-panic.h"
#include "go-type.h"
#include "map.h"
/* This file implements support for reflection on maps. These
functions are called from reflect/value.go. */
struct mapaccess_ret
{
uintptr_t val;
_Bool pres;
};
extern struct mapaccess_ret mapaccess (struct __go_map_type *, uintptr_t,
uintptr_t)
asm ("libgo_reflect.reflect.mapaccess");
struct mapaccess_ret
mapaccess (struct __go_map_type *mt, uintptr_t m, uintptr_t key_i)
{
struct __go_map *map = (struct __go_map *) m;
void *key;
const struct __go_type_descriptor *key_descriptor;
void *p;
const struct __go_type_descriptor *val_descriptor;
struct mapaccess_ret ret;
void *val;
void *pv;
__go_assert (mt->__common.__code == GO_MAP);
key_descriptor = mt->__key_type;
if (__go_is_pointer_type (key_descriptor))
key = &key_i;
else
key = (void *) key_i;
if (map == NULL)
p = NULL;
else
p = __go_map_index (map, key, 0);
val_descriptor = mt->__val_type;
if (__go_is_pointer_type (val_descriptor))
{
val = NULL;
pv = &val;
}
else
{
val = __go_alloc (val_descriptor->__size);
pv = val;
}
if (p == NULL)
ret.pres = 0;
else
{
__builtin_memcpy (pv, p, val_descriptor->__size);
ret.pres = 1;
}
ret.val = (uintptr_t) val;
return ret;
}
extern void mapassign (struct __go_map_type *, uintptr_t, uintptr_t,
uintptr_t, _Bool)
asm ("libgo_reflect.reflect.mapassign");
void
mapassign (struct __go_map_type *mt, uintptr_t m, uintptr_t key_i,
uintptr_t val_i, _Bool pres)
{
struct __go_map *map = (struct __go_map *) m;
const struct __go_type_descriptor *key_descriptor;
void *key;
__go_assert (mt->__common.__code == GO_MAP);
if (map == NULL)
__go_panic_msg ("assignment to entry in nil map");
key_descriptor = mt->__key_type;
if (__go_is_pointer_type (key_descriptor))
key = &key_i;
else
key = (void *) key_i;
if (!pres)
__go_map_delete (map, key);
else
{
void *p;
const struct __go_type_descriptor *val_descriptor;
void *pv;
p = __go_map_index (map, key, 1);
val_descriptor = mt->__val_type;
if (__go_is_pointer_type (val_descriptor))
pv = &val_i;
else
pv = (void *) val_i;
__builtin_memcpy (p, pv, val_descriptor->__size);
}
}
extern int32_t maplen (uintptr_t)
asm ("libgo_reflect.reflect.maplen");
int32_t
maplen (uintptr_t m)
{
struct __go_map *map = (struct __go_map *) m;
if (map == NULL)
return 0;
return (int32_t) map->__element_count;
}
extern unsigned char *mapiterinit (struct __go_map_type *, uintptr_t)
asm ("libgo_reflect.reflect.mapiterinit");
unsigned char *
mapiterinit (struct __go_map_type *mt, uintptr_t m)
{
struct __go_hash_iter *it;
__go_assert (mt->__common.__code == GO_MAP);
it = __go_alloc (sizeof (struct __go_hash_iter));
__go_mapiterinit ((struct __go_map *) m, it);
return (unsigned char *) it;
}
extern void mapiternext (unsigned char *)
asm ("libgo_reflect.reflect.mapiternext");
void
mapiternext (unsigned char *it)
{
__go_mapiternext ((struct __go_hash_iter *) it);
}
struct mapiterkey_ret
{
uintptr_t key;
_Bool ok;
};
extern struct mapiterkey_ret mapiterkey (unsigned char *)
asm ("libgo_reflect.reflect.mapiterkey");
struct mapiterkey_ret
mapiterkey (unsigned char *ita)
{
struct __go_hash_iter *it = (struct __go_hash_iter *) ita;
struct mapiterkey_ret ret;
if (it->entry == NULL)
{
ret.key = 0;
ret.ok = 0;
}
else
{
const struct __go_type_descriptor *key_descriptor;
void *key;
void *pk;
key_descriptor = it->map->__descriptor->__map_descriptor->__key_type;
if (__go_is_pointer_type (key_descriptor))
{
key = NULL;
pk = &key;
}
else
{
key = __go_alloc (key_descriptor->__size);
pk = key;
}
__go_mapiter1 (it, pk);
ret.key = (uintptr_t) key;
ret.ok = 1;
}
return ret;
}
/* Make a new map. We have to build our own map descriptor. */
extern uintptr_t makemap (const struct __go_map_type *)
asm ("libgo_reflect.reflect.makemap");
uintptr_t
makemap (const struct __go_map_type *t)
{
struct __go_map_descriptor *md;
unsigned int o;
const struct __go_type_descriptor *kt;
const struct __go_type_descriptor *vt;
struct __go_map* map;
void *ret;
/* FIXME: Reference count. */
md = (struct __go_map_descriptor *) __go_alloc (sizeof (*md));
md->__map_descriptor = t;
o = sizeof (void *);
kt = t->__key_type;
o = (o + kt->__field_align - 1) & ~ (kt->__field_align - 1);
md->__key_offset = o;
o += kt->__size;
vt = t->__val_type;
o = (o + vt->__field_align - 1) & ~ (vt->__field_align - 1);
md->__val_offset = o;
o += vt->__size;
o = (o + sizeof (void *) - 1) & ~ (sizeof (void *) - 1);
o = (o + kt->__field_align - 1) & ~ (kt->__field_align - 1);
o = (o + vt->__field_align - 1) & ~ (vt->__field_align - 1);
md->__entry_size = o;
map = __go_new_map (md, 0);
ret = __go_alloc (sizeof (void *));
__builtin_memcpy (ret, &map, sizeof (void *));
return (uintptr_t) ret;
}
|
