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
|
/*
* %CopyrightBegin%
*
* Copyright Ericsson AB 1996-2011. All Rights Reserved.
*
* The contents of this file are subject to the Erlang Public License,
* Version 1.1, (the "License"); you may not use this file except in
* compliance with the License. You should have received a copy of the
* Erlang Public License along with this software. If not, it can be
* retrieved online at http://www.erlang.org/.
*
* Software distributed under the License is distributed on an "AS IS"
* basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
* the License for the specific language governing rights and limitations
* under the License.
*
* %CopyrightEnd%
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include "sys.h"
#include "erl_vm.h"
#include "global.h"
#include "module.h"
#ifdef DEBUG
# define IF_DEBUG(x) x
#else
# define IF_DEBUG(x)
#endif
#define MODULE_SIZE 50
#define MODULE_LIMIT (64*1024)
static IndexTable module_tables[ERTS_NUM_CODE_IX];
/*
* SMP note: We don't need to look accesses to the module table because
* there is one only scheduler thread when we update it.
*/
#include "erl_smp.h"
void module_info(int to, void *to_arg)
{
index_info(to, to_arg, &module_tables[erts_active_code_ix()]);
}
static HashValue module_hash(Module* x)
{
return (HashValue) x->module;
}
static int module_cmp(Module* tmpl, Module* obj)
{
return tmpl->module != obj->module;
}
static Module* module_alloc(Module* tmpl)
{
Module* obj = (Module*) erts_alloc(ERTS_ALC_T_MODULE, sizeof(Module));
obj->module = tmpl->module;
obj->curr.code = 0;
obj->old.code = 0;
obj->curr.code_length = 0;
obj->old.code_length = 0;
obj->slot.index = -1;
obj->curr.nif = NULL;
obj->old.nif = NULL;
return obj;
}
static void module_free(Module* mod)
{
erts_free(ERTS_ALC_T_MODULE, mod);
}
void init_module_table(void)
{
HashFunctions f;
int i;
f.hash = (H_FUN) module_hash;
f.cmp = (HCMP_FUN) module_cmp;
f.alloc = (HALLOC_FUN) module_alloc;
f.free = (HFREE_FUN) module_free;
for (i = 0; i < ERTS_NUM_CODE_IX; i++) {
erts_index_init(ERTS_ALC_T_MODULE_TABLE, &module_tables[i], "module_code",
MODULE_SIZE, MODULE_LIMIT, f);
}
}
Module*
erts_get_module(Eterm mod, ErtsCodeIndex code_ix)
{
Module e;
int index;
IndexTable* mod_tab;
ASSERT(is_atom(mod));
mod_tab = &module_tables[code_ix];
e.module = atom_val(mod);
index = index_get(mod_tab, (void*) &e);
if (index == -1) {
return NULL;
} else {
return (Module*) erts_index_lookup(mod_tab, index);
}
}
Module*
erts_put_module(Eterm mod)
{
Module e;
int index;
IndexTable* mod_tab;
ASSERT(is_atom(mod));
ERTS_SMP_LC_ASSERT(erts_initialized == 0
|| erts_is_code_ix_locked()
|| erts_smp_thr_progress_is_blocking());
mod_tab = &module_tables[erts_loader_code_ix()];
e.module = atom_val(mod);
index = index_put(mod_tab, (void*) &e);
return (Module*) erts_index_lookup(mod_tab, index);
}
Module *module_code(int i, ErtsCodeIndex code_ix)
{
return (Module*) erts_index_lookup(&module_tables[code_ix], i);
}
int module_code_size(ErtsCodeIndex code_ix)
{
return module_tables[code_ix].entries;
}
int module_table_sz(void)
{
return index_table_sz(&module_tables[erts_active_code_ix()]);
}
#ifdef DEBUG
static ErtsCodeIndex dbg_load_code_ix = 0;
#endif
static int entries_at_start_load = 0;
void module_start_load(void)
{
IndexTable* src = &module_tables[erts_active_code_ix()];
IndexTable* dst = &module_tables[erts_loader_code_ix()];
Module* src_mod;
Module* dst_mod;
int i;
ASSERT(dbg_load_code_ix == -1);
ASSERT(dst->entries <= src->entries);
/*
* Make sure our existing modules are up-to-date
*/
for (i = 0; i < dst->entries; i++) {
src_mod = (Module*) erts_index_lookup(src, i);
dst_mod = (Module*) erts_index_lookup(dst, i);
ASSERT(src_mod->module == dst_mod->module);
dst_mod->curr = src_mod->curr;
dst_mod->old = src_mod->old;
}
/*
* Copy all new modules from active table
*/
for (i = dst->entries; i < src->entries; i++) {
src_mod = (Module*) erts_index_lookup(src, i);
dst_mod = (Module*) erts_index_lookup(dst, index_put(dst, src_mod));
ASSERT(dst_mod != src_mod);
dst_mod->curr = src_mod->curr;
dst_mod->old = src_mod->old;
}
entries_at_start_load = dst->entries;
IF_DEBUG(dbg_load_code_ix = erts_loader_code_ix());
}
void module_end_load(int commit)
{
ASSERT(dbg_load_code_ix == erts_loader_code_ix());
if (!commit) { /* abort */
IndexTable* tab = &module_tables[erts_loader_code_ix()];
ASSERT(entries_at_start_load <= tab->entries);
index_erase_latest_from(tab, entries_at_start_load);
}
IF_DEBUG(dbg_load_code_ix = -1);
}
|
