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/*
* %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;
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_staging_code_ix()];
e.module = atom_val(mod);
return (Module*) index_put_entry(mod_tab, (void*) &e);
}
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_staging(void)
{
IndexTable* src = &module_tables[erts_active_code_ix()];
IndexTable* dst = &module_tables[erts_staging_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*) index_put_entry(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_staging_code_ix());
}
void module_end_staging(int commit)
{
ASSERT(dbg_load_code_ix == erts_staging_code_ix());
if (!commit) { /* abort */
IndexTable* tab = &module_tables[erts_staging_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);
}
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