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Code Issues 1 Releases Wiki Activity

Tables created via table_init cannot leak memory.

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Before, if Janet paniced without calling table_deinit
on a table created via table_init, Janet leaked memory.
This changes tables so that tables created via table_init
us scratch memory for auto cleanup instead of normal
malloc/free.
This commit is contained in:
Calvin Rose 2019-06-05 17:08:49 -04:00
parent efb2ab06cb
commit 64a80c57e3
2 changed files with 45 additions and 12 deletions
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2
src/core/gc.c
View File

@ -265,7 +265,7 @@ static void janet_deinit_block(JanetGCObject *mem) {
free(((JanetArray *) mem)->data);
break;
case JANET_MEMORY_TABLE:
janet_table_deinit((JanetTable *) mem);
free(((JanetTable *) mem)->data);
break;
case JANET_MEMORY_FIBER:
free(((JanetFiber *)mem)->data);

43
src/core/table.c
View File

@ -27,15 +27,33 @@
#include <math.h>
#endif
/* Initialize a table */
JanetTable *janet_table_init(JanetTable *table, int32_t capacity) {
#define JANET_TABLE_FLAG_STACK 0x10000
static void *janet_memalloc_empty_local(int32_t count) {
int32_t i;
void *mem = janet_smalloc(count * sizeof(JanetKV));
JanetKV *mmem = (JanetKV *)mem;
for (i = 0; i < count; i++) {
JanetKV *kv = mmem + i;
kv->key = janet_wrap_nil();
kv->value = janet_wrap_nil();
}
return mem;
}
static JanetTable *janet_table_init_impl(JanetTable *table, int32_t capacity, int stackalloc) {
JanetKV *data;
capacity = janet_tablen(capacity);
if (stackalloc) table->gc.flags = JANET_TABLE_FLAG_STACK;
if (capacity) {
if (stackalloc) {
data = janet_memalloc_empty_local(capacity);
} else {
data = (JanetKV *) janet_memalloc_empty(capacity);
if (NULL == data) {
JANET_OUT_OF_MEMORY;
}
}
table->data = data;
table->capacity = capacity;
} else {
@ -48,15 +66,20 @@ JanetTable *janet_table_init(JanetTable *table, int32_t capacity) {
return table;
}
/* Initialize a table */
JanetTable *janet_table_init(JanetTable *table, int32_t capacity) {
return janet_table_init_impl(table, capacity, 1);
}
/* Deinitialize a table */
void janet_table_deinit(JanetTable *table) {
free(table->data);
janet_sfree(table->data);
}
/* Create a new table */
JanetTable *janet_table(int32_t capacity) {
JanetTable *table = janet_gcalloc(JANET_MEMORY_TABLE, sizeof(JanetTable));
return janet_table_init(table, capacity);
return janet_table_init_impl(table, capacity, 0);
}
/* Find the bucket that contains the given key. Will also return
@ -68,10 +91,16 @@ JanetKV *janet_table_find(JanetTable *t, Janet key) {
/* Resize the dictionary table. */
static void janet_table_rehash(JanetTable *t, int32_t size) {
JanetKV *olddata = t->data;
JanetKV *newdata = (JanetKV *) janet_memalloc_empty(size);
JanetKV *newdata;
int islocal = t->gc.flags & JANET_TABLE_FLAG_STACK;
if (islocal) {
newdata = (JanetKV *) janet_memalloc_empty_local(size);
} else {
newdata = (JanetKV *) janet_memalloc_empty(size);
if (NULL == newdata) {
JANET_OUT_OF_MEMORY;
}
}
int32_t i, oldcapacity;
oldcapacity = t->capacity;
t->data = newdata;
@ -84,7 +113,11 @@ static void janet_table_rehash(JanetTable *t, int32_t size) {
*newkv = *kv;
}
}
if (islocal) {
janet_sfree(olddata);
} else {
free(olddata);
}
}
/* Get a value out of the table */