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authorSverker Eriksson <[email protected]>2012-01-23 11:25:41 +0100
committerSverker Eriksson <[email protected]>2012-02-21 12:23:01 +0100
commit194ae0717f9be27374db3609e6884fad086df4df (patch)
treec1e5ab615230a1214ad142ac6cd001fc0b1ac5f3 /erts/emulator
parent2a04e25043753d1e9de617e85b27b64781b683cb (diff)
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erts: Refactor export entry allocation
Use a more general approach that does not assume in which order the table entries in a blob are allocated and freed.
Diffstat (limited to 'erts/emulator')
-rw-r--r--erts/emulator/beam/export.c106
1 files changed, 51 insertions, 55 deletions
diff --git a/erts/emulator/beam/export.c b/erts/emulator/beam/export.c
index e61cd95566..957d93a281 100644
--- a/erts/emulator/beam/export.c
+++ b/erts/emulator/beam/export.c
@@ -64,7 +64,6 @@ struct export_entry
struct export_blob
{
Export exp;
- unsigned top_ix; /* highest ix used in entryv */
struct export_entry entryv[ERTS_NUM_CODE_IX];
/* Note that entryv is not indexed by "code_ix".
*/
@@ -78,6 +77,11 @@ struct export_templ
Export exp;
};
+static struct export_blob* entry_to_blob(struct export_entry* ee)
+{
+ return (struct export_blob*)
+ ((char*)ee->ep - offsetof(struct export_blob,exp));
+}
void
export_info(int to, void *to_arg)
@@ -117,36 +121,53 @@ export_cmp(struct export_entry* tmpl_e, struct export_entry* obj_e)
static struct export_entry*
export_alloc(struct export_entry* tmpl_e)
{
-
- Export* tmpl = tmpl_e->ep;
- struct export_blob* blob =
- (struct export_blob*) erts_alloc(ERTS_ALC_T_EXPORT, sizeof(*blob));
- Export* obj = &blob->exp;
- int i;
-
- obj->fake_op_func_info_for_hipe[0] = 0;
- obj->fake_op_func_info_for_hipe[1] = 0;
- obj->code[0] = tmpl->code[0];
- obj->code[1] = tmpl->code[1];
- obj->code[2] = tmpl->code[2];
- obj->code[3] = (BeamInstr) em_call_error_handler;
- obj->code[4] = 0;
- obj->match_prog_set = NULL;
-
- for (i=0; i<ERTS_NUM_CODE_IX; i++) {
- obj->addressv[i] = obj->code+3;
-
- blob->entryv[i].slot.index = -1;
- blob->entryv[i].ep = &blob->exp;
+ struct export_blob* blob;
+ unsigned ix;
+
+ if (tmpl_e->slot.index == -1) { /* Template, allocate blob */
+ Export* tmpl = tmpl_e->ep;
+ Export* obj;
+
+ blob = (struct export_blob*) erts_alloc(ERTS_ALC_T_EXPORT, sizeof(*blob));
+ obj = &blob->exp;
+ obj->fake_op_func_info_for_hipe[0] = 0;
+ obj->fake_op_func_info_for_hipe[1] = 0;
+ obj->code[0] = tmpl->code[0];
+ obj->code[1] = tmpl->code[1];
+ obj->code[2] = tmpl->code[2];
+ obj->code[3] = (BeamInstr) em_call_error_handler;
+ obj->code[4] = 0;
+ obj->match_prog_set = NULL;
+
+ for (ix=0; ix<ERTS_NUM_CODE_IX; ix++) {
+ obj->addressv[ix] = obj->code+3;
+
+ blob->entryv[ix].slot.index = -1;
+ blob->entryv[ix].ep = &blob->exp;
+ }
+ ix = 0;
+ }
+ else { /* Existing entry in another table, use free entry in blob */
+ blob = entry_to_blob(tmpl_e);
+ for (ix = 0; blob->entryv[ix].slot.index >= 0; ix++) {
+ ASSERT(ix < ERTS_NUM_CODE_IX);
+ }
}
- blob->top_ix = 0;
- return &blob->entryv[blob->top_ix];
+ return &blob->entryv[ix];
}
-static void
+static void
export_free(struct export_entry* obj)
{
- erts_free(ERTS_ALC_T_EXPORT, (void*) obj);
+ struct export_blob* blob = entry_to_blob(obj);
+ int i;
+ obj->slot.index = -1;
+ for (i=0; i < ERTS_NUM_CODE_IX; i++) {
+ if (blob->entryv[i].slot.index >= 0) {
+ return;
+ }
+ }
+ erts_free(ERTS_ALC_T_EXPORT, blob);
}
void
@@ -359,18 +380,6 @@ Export *export_get(Export *e)
return entry ? entry->ep : NULL;
}
-static struct export_entry*
-export_dummy_alloc(struct export_entry* entry)
-{
- return entry;
-}
-
-static struct export_blob* entry_to_blob(struct export_entry* ee)
-{
- return (struct export_blob*)
- ((char*)ee->ep - offsetof(struct export_blob,exp));
-}
-
IF_DEBUG(static ErtsCodeIndex debug_start_load_ix = 0;)
static int entries_at_start_load = 0;
@@ -383,7 +392,6 @@ void export_start_load(void)
IndexTable* src = &export_tables[src_ix];
struct export_entry* src_entry;
struct export_entry* dst_entry;
- struct export_blob* blob;
int i;
ASSERT(dst_ix != src_ix);
@@ -394,31 +402,19 @@ void export_start_load(void)
* Make sure our existing entries are up to date
*/
for (i = 0; i < dst->entries; i++) {
- src_entry = (struct export_entry*) erts_index_lookup(src, i);
- blob = entry_to_blob(src_entry);
- blob->exp.addressv[dst_ix] = blob->exp.addressv[src_ix];
+ dst_entry = (struct export_entry*) erts_index_lookup(dst, i);
+ dst_entry->ep->addressv[dst_ix] = dst_entry->ep->addressv[src_ix];
}
/*
* Insert all new entries from active table
*/
-
- /* Trick hash_put (called by index_put) to insert existing entries. */
- dst->htable.fun.alloc = (HALLOC_FUN) &export_dummy_alloc;
-
for (i = dst->entries; i < src->entries; i++) {
src_entry = (struct export_entry*) erts_index_lookup(src, i);
- blob = entry_to_blob(src_entry);
- dst_entry = &blob->entryv[++blob->top_ix];
- blob->exp.addressv[dst_ix] = blob->exp.addressv[src_ix];
- ASSERT(blob->top_ix < ERTS_NUM_CODE_IX);
- ASSERT(dst_entry->ep == &blob->exp);
- ASSERT(dst_entry->slot.index == -1);
- index_put(dst, dst_entry);
+ src_entry->ep->addressv[dst_ix] = src_entry->ep->addressv[src_ix];
+ index_put(dst, src_entry);
}
- dst->htable.fun.alloc = (HALLOC_FUN) &export_alloc; /* restore */
-
merge_secondary_table(dst);
entries_at_start_load = dst->entries;