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bpo-40609: _tracemalloc allocates traces (GH-20064)

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Rewrite _tracemalloc to store "trace_t*" rather than directly
"trace_t" in traces hash tables. Traces are now allocated on the heap
memory, outside the hash table.

Add tracemalloc_copy_traces() and tracemalloc_copy_domains() helper
functions.

Remove _Py_hashtable_copy() function since there is no API to copy a
key or a value.

Remove also _Py_hashtable_delete() function which was commented.
This commit is contained in:
Victor Stinner 2020-05-13 03:52:11 +02:00 • committed by GitHub
parent 2d0a3d682f
commit d95bd4214c
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GPG key ID: 4AEE18F83AFDEB23
3 changed files with 117 additions and 102 deletions
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49
Python/hashtable.c
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@ -350,21 +350,6 @@ _Py_hashtable_pop(_Py_hashtable_t *ht, const void *key,
}
/* Code commented since the function is not needed in Python */
#if 0
void
_Py_hashtable_delete(_Py_hashtable_t *ht, size_t const void *key)
{
#ifndef NDEBUG
int found = _Py_hashtable_pop_entry(ht, key, NULL, 0);
assert(found);
#else
(void)_Py_hashtable_pop_entry(ht, key, NULL, 0);
#endif
}
#endif
int
_Py_hashtable_foreach(_Py_hashtable_t *ht,
_Py_hashtable_foreach_func func,
@ -538,37 +523,3 @@ _Py_hashtable_destroy(_Py_hashtable_t *ht)
ht->alloc.free(ht->buckets);
ht->alloc.free(ht);
}
_Py_hashtable_t *
_Py_hashtable_copy(_Py_hashtable_t *src)
{
const size_t data_size = src->data_size;
_Py_hashtable_t *dst;
_Py_hashtable_entry_t *entry;
size_t bucket;
int err;
dst = _Py_hashtable_new_full(data_size, src->num_buckets,
src->hash_func,
src->compare_func,
src->key_destroy_func,
src->value_destroy_func,
&src->alloc);
if (dst == NULL)
return NULL;
for (bucket=0; bucket < src->num_buckets; bucket++) {
entry = TABLE_HEAD(src, bucket);
for (; entry; entry = ENTRY_NEXT(entry)) {
const void *key = entry->key;
const void *pdata = _Py_HASHTABLE_ENTRY_PDATA(entry);
err = _Py_hashtable_set(dst, key, data_size, pdata);
if (err) {
_Py_hashtable_destroy(dst);
return NULL;
}
}
}
return dst;
}