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gh-124296: Remove private dictionary version tag (PEP 699) (#124472)

This commit is contained in:
Sam Gross 2024-10-01 12:39:56 -04:00 committed by GitHub
parent 60ff67d010
commit 5aa91c56bf
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GPG Key ID: B5690EEEBB952194
13 changed files with 35 additions and 354 deletions
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13
Include/cpython/dictobject.h
View File

@ -14,16 +14,11 @@ typedef struct {
/* Number of items in the dictionary */
Py_ssize_t ma_used;
/* Dictionary version: globally unique, value change each time
the dictionary is modified */
#ifdef Py_BUILD_CORE
/* Bits 0-7 are for dict watchers.
/* This is a private field for CPython's internal use.
* Bits 0-7 are for dict watchers.
* Bits 8-11 are for the watched mutation counter (used by tier2 optimization)
* The remaining bits (12-63) are the actual version tag. */
uint64_t ma_version_tag;
#else
Py_DEPRECATED(3.12) uint64_t ma_version_tag;
#endif
* The remaining bits are not currently used. */
uint64_t _ma_watcher_tag;
PyDictKeysObject *ma_keys;

30
Include/internal/pycore_dict.h
View File

@ -230,31 +230,6 @@ static inline PyDictUnicodeEntry* DK_UNICODE_ENTRIES(PyDictKeysObject *dk) {
#define DICT_WATCHER_MASK ((1 << DICT_MAX_WATCHERS) - 1)
#define DICT_WATCHER_AND_MODIFICATION_MASK ((1 << (DICT_MAX_WATCHERS + DICT_WATCHED_MUTATION_BITS)) - 1)
#ifdef Py_GIL_DISABLED
#define THREAD_LOCAL_DICT_VERSION_COUNT 256
#define THREAD_LOCAL_DICT_VERSION_BATCH THREAD_LOCAL_DICT_VERSION_COUNT * DICT_VERSION_INCREMENT
static inline uint64_t
dict_next_version(PyInterpreterState *interp)
{
PyThreadState *tstate = PyThreadState_GET();
uint64_t cur_progress = (tstate->dict_global_version &
(THREAD_LOCAL_DICT_VERSION_BATCH - 1));
if (cur_progress == 0) {
uint64_t next = _Py_atomic_add_uint64(&interp->dict_state.global_version,
THREAD_LOCAL_DICT_VERSION_BATCH);
tstate->dict_global_version = next;
}
return tstate->dict_global_version += DICT_VERSION_INCREMENT;
}
#define DICT_NEXT_VERSION(INTERP) dict_next_version(INTERP)
#else
#define DICT_NEXT_VERSION(INTERP) \
((INTERP)->dict_state.global_version += DICT_VERSION_INCREMENT)
#endif
PyAPI_FUNC(void)
_PyDict_SendEvent(int watcher_bits,
@ -263,7 +238,7 @@ _PyDict_SendEvent(int watcher_bits,
PyObject *key,
PyObject *value);
static inline uint64_t
static inline void
_PyDict_NotifyEvent(PyInterpreterState *interp,
PyDict_WatchEvent event,
PyDictObject *mp,
@ -271,12 +246,11 @@ _PyDict_NotifyEvent(PyInterpreterState *interp,
PyObject *value)
{
assert(Py_REFCNT((PyObject*)mp) > 0);
int watcher_bits = mp->ma_version_tag & DICT_WATCHER_MASK;
int watcher_bits = mp->_ma_watcher_tag & DICT_WATCHER_MASK;
if (watcher_bits) {
RARE_EVENT_STAT_INC(watched_dict_modification);
_PyDict_SendEvent(watcher_bits, event, mp, key, value);
}
return DICT_NEXT_VERSION(interp) | (mp->ma_version_tag & DICT_WATCHER_AND_MODIFICATION_MASK);
}
extern PyDictObject *_PyObject_MaterializeManagedDict(PyObject *obj);

4
Include/internal/pycore_dict_state.h
View File

@ -12,10 +12,6 @@ extern "C" {
#define DICT_WATCHED_MUTATION_BITS 4
struct _Py_dict_state {
/*Global counter used to set ma_version_tag field of dictionary.
* It is incremented each time that a dictionary is created and each
* time that a dictionary is modified. */
uint64_t global_version;
uint32_t next_keys_version;
PyDict_WatchCallback watchers[DICT_MAX_WATCHERS];
};

191
Lib/test/test_dict_version.py
View File

@ -1,191 +0,0 @@
"""
Test implementation of the PEP 509: dictionary versioning.
"""
import unittest
from test.support import import_helper
# PEP 509 is implemented in CPython but other Python implementations
# don't require to implement it
_testcapi = import_helper.import_module('_testcapi')
class DictVersionTests(unittest.TestCase):
type2test = dict
def setUp(self):
self.seen_versions = set()
self.dict = None
def check_version_unique(self, mydict):
version = _testcapi.dict_get_version(mydict)
self.assertNotIn(version, self.seen_versions)
self.seen_versions.add(version)
def check_version_changed(self, mydict, method, *args, **kw):
result = method(*args, **kw)
self.check_version_unique(mydict)
return result
def check_version_dont_change(self, mydict, method, *args, **kw):
version1 = _testcapi.dict_get_version(mydict)
self.seen_versions.add(version1)
result = method(*args, **kw)
version2 = _testcapi.dict_get_version(mydict)
self.assertEqual(version2, version1, "version changed")
return result
def new_dict(self, *args, **kw):
d = self.type2test(*args, **kw)
self.check_version_unique(d)
return d
def test_constructor(self):
# new empty dictionaries must all have an unique version
empty1 = self.new_dict()
empty2 = self.new_dict()
empty3 = self.new_dict()
# non-empty dictionaries must also have an unique version
nonempty1 = self.new_dict(x='x')
nonempty2 = self.new_dict(x='x', y='y')
def test_copy(self):
d = self.new_dict(a=1, b=2)
d2 = self.check_version_dont_change(d, d.copy)
# dict.copy() must create a dictionary with a new unique version
self.check_version_unique(d2)
def test_setitem(self):
d = self.new_dict()
# creating new keys must change the version
self.check_version_changed(d, d.__setitem__, 'x', 'x')
self.check_version_changed(d, d.__setitem__, 'y', 'y')
# changing values must change the version
self.check_version_changed(d, d.__setitem__, 'x', 1)
self.check_version_changed(d, d.__setitem__, 'y', 2)
def test_setitem_same_value(self):
value = object()
d = self.new_dict()
# setting a key must change the version
self.check_version_changed(d, d.__setitem__, 'key', value)
# setting a key to the same value with dict.__setitem__
# must change the version
self.check_version_dont_change(d, d.__setitem__, 'key', value)
# setting a key to the same value with dict.update
# must change the version
self.check_version_dont_change(d, d.update, key=value)
d2 = self.new_dict(key=value)
self.check_version_dont_change(d, d.update, d2)
def test_setitem_equal(self):
class AlwaysEqual:
def __eq__(self, other):
return True
value1 = AlwaysEqual()
value2 = AlwaysEqual()
self.assertTrue(value1 == value2)
self.assertFalse(value1 != value2)
self.assertIsNot(value1, value2)
d = self.new_dict()
self.check_version_changed(d, d.__setitem__, 'key', value1)
self.assertIs(d['key'], value1)
# setting a key to a value equal to the current value
# with dict.__setitem__() must change the version
self.check_version_changed(d, d.__setitem__, 'key', value2)
self.assertIs(d['key'], value2)
# setting a key to a value equal to the current value
# with dict.update() must change the version
self.check_version_changed(d, d.update, key=value1)
self.assertIs(d['key'], value1)
d2 = self.new_dict(key=value2)
self.check_version_changed(d, d.update, d2)
self.assertIs(d['key'], value2)
def test_setdefault(self):
d = self.new_dict()
# setting a key with dict.setdefault() must change the version
self.check_version_changed(d, d.setdefault, 'key', 'value1')
# don't change the version if the key already exists
self.check_version_dont_change(d, d.setdefault, 'key', 'value2')
def test_delitem(self):
d = self.new_dict(key='value')
# deleting a key with dict.__delitem__() must change the version
self.check_version_changed(d, d.__delitem__, 'key')
# don't change the version if the key doesn't exist
self.check_version_dont_change(d, self.assertRaises, KeyError,
d.__delitem__, 'key')
def test_pop(self):
d = self.new_dict(key='value')
# pop() must change the version if the key exists
self.check_version_changed(d, d.pop, 'key')
# pop() must not change the version if the key does not exist
self.check_version_dont_change(d, self.assertRaises, KeyError,
d.pop, 'key')
def test_popitem(self):
d = self.new_dict(key='value')
# popitem() must change the version if the dict is not empty
self.check_version_changed(d, d.popitem)
# popitem() must not change the version if the dict is empty
self.check_version_dont_change(d, self.assertRaises, KeyError,
d.popitem)
def test_update(self):
d = self.new_dict(key='value')
# update() calling with no argument must not change the version
self.check_version_dont_change(d, d.update)
# update() must change the version
self.check_version_changed(d, d.update, key='new value')
d2 = self.new_dict(key='value 3')
self.check_version_changed(d, d.update, d2)
def test_clear(self):
d = self.new_dict(key='value')
# clear() must change the version if the dict is not empty
self.check_version_changed(d, d.clear)
# clear() must not change the version if the dict is empty
self.check_version_dont_change(d, d.clear)
class Dict(dict):
pass
class DictSubtypeVersionTests(DictVersionTests):
type2test = Dict
if __name__ == "__main__":
unittest.main()

35
Lib/test/test_free_threading/test_dict.py
View File

@ -142,41 +142,6 @@ class TestDict(TestCase):
for ref in thread_list:
self.assertIsNone(ref())
@unittest.skipIf(_testcapi is None, 'need _testcapi module')
def test_dict_version(self):
dict_version = _testcapi.dict_version
THREAD_COUNT = 10
DICT_COUNT = 10000
lists = []
writers = []
def writer_func(thread_list):
for i in range(DICT_COUNT):
thread_list.append(dict_version({}))
for x in range(THREAD_COUNT):
thread_list = []
lists.append(thread_list)
writer = Thread(target=partial(writer_func, thread_list))
writers.append(writer)
for writer in writers:
writer.start()
for writer in writers:
writer.join()
total_len = 0
values = set()
for thread_list in lists:
for v in thread_list:
if v in values:
print('dup', v, (v/4096)%256)
values.add(v)
total_len += len(thread_list)
versions = set(dict_version for thread_list in lists for dict_version in thread_list)
self.assertEqual(len(versions), THREAD_COUNT*DICT_COUNT)
if __name__ == "__main__":
unittest.main()

3
Misc/NEWS.d/next/C_API/2024-09-24-20-34-21.gh-issue-124296.S4QoS1.rst Normal file
View File

@ -0,0 +1,3 @@
:c:type:`PyDictObject` no longer maintains a private version tag field
``ma_version_tag`` per :pep:`699`. This field was originally added in
Python 3.6 (:pep:`509`) and deprecated in Python 3.12.

14
Modules/_testcapi/dict.c
View File

@ -181,19 +181,6 @@ dict_popstring_null(PyObject *self, PyObject *args)
RETURN_INT(PyDict_PopString(dict, key, NULL));
}
static PyObject *
dict_version(PyObject *self, PyObject *dict)
{
if (!PyDict_Check(dict)) {
PyErr_SetString(PyExc_TypeError, "expected dict");
return NULL;
}
_Py_COMP_DIAG_PUSH
_Py_COMP_DIAG_IGNORE_DEPR_DECLS
return PyLong_FromUnsignedLongLong(((PyDictObject *)dict)->ma_version_tag);
_Py_COMP_DIAG_POP
}
static PyMethodDef test_methods[] = {
{"dict_containsstring", dict_containsstring, METH_VARARGS},
{"dict_getitemref", dict_getitemref, METH_VARARGS},
@ -204,7 +191,6 @@ static PyMethodDef test_methods[] = {
{"dict_pop_null", dict_pop_null, METH_VARARGS},
{"dict_popstring", dict_popstring, METH_VARARGS},
{"dict_popstring_null", dict_popstring_null, METH_VARARGS},
{"dict_version", dict_version, METH_O},
{NULL},
};

20
Modules/_testcapimodule.c
View File

@ -1909,25 +1909,6 @@ getitem_with_error(PyObject *self, PyObject *args)
return PyObject_GetItem(map, key);
}
static PyObject *
dict_get_version(PyObject *self, PyObject *args)
{
PyDictObject *dict;
uint64_t version;
if (!PyArg_ParseTuple(args, "O!", &PyDict_Type, &dict))
return NULL;
_Py_COMP_DIAG_PUSH
_Py_COMP_DIAG_IGNORE_DEPR_DECLS
version = dict->ma_version_tag;
_Py_COMP_DIAG_POP
static_assert(sizeof(unsigned long long) >= sizeof(version),
"version is larger than unsigned long long");
return PyLong_FromUnsignedLongLong((unsigned long long)version);
}
static PyObject *
raise_SIGINT_then_send_None(PyObject *self, PyObject *args)
@ -3407,7 +3388,6 @@ static PyMethodDef TestMethods[] = {
{"return_result_with_error", return_result_with_error, METH_NOARGS},
{"getitem_with_error", getitem_with_error, METH_VARARGS},
{"Py_CompileString", pycompilestring, METH_O},
{"dict_get_version", dict_get_version, METH_VARARGS},
{"raise_SIGINT_then_send_None", raise_SIGINT_then_send_None, METH_VARARGS},
{"stack_pointer", stack_pointer, METH_NOARGS},
#ifdef W_STOPCODE

63
Objects/dictobject.c
View File

@ -877,7 +877,7 @@ new_dict(PyInterpreterState *interp,
mp->ma_keys = keys;
mp->ma_values = values;
mp->ma_used = used;
mp->ma_version_tag = DICT_NEXT_VERSION(interp);
mp->_ma_watcher_tag = 0;
ASSERT_CONSISTENT(mp);
return (PyObject *)mp;
}
@ -1678,8 +1678,7 @@ insert_combined_dict(PyInterpreterState *interp, PyDictObject *mp,
}
}
uint64_t new_version = _PyDict_NotifyEvent(
interp, PyDict_EVENT_ADDED, mp, key, value);
_PyDict_NotifyEvent(interp, PyDict_EVENT_ADDED, mp, key, value);
mp->ma_keys->dk_version = 0;
Py_ssize_t hashpos = find_empty_slot(mp->ma_keys, hash);
@ -1698,7 +1697,6 @@ insert_combined_dict(PyInterpreterState *interp, PyDictObject *mp,
STORE_VALUE(ep, value);
STORE_HASH(ep, hash);
}
mp->ma_version_tag = new_version;
STORE_KEYS_USABLE(mp->ma_keys, mp->ma_keys->dk_usable - 1);
STORE_KEYS_NENTRIES(mp->ma_keys, mp->ma_keys->dk_nentries + 1);
assert(mp->ma_keys->dk_usable >= 0);
@ -1744,16 +1742,14 @@ insert_split_value(PyInterpreterState *interp, PyDictObject *mp, PyObject *key,
MAINTAIN_TRACKING(mp, key, value);
PyObject *old_value = mp->ma_values->values[ix];
if (old_value == NULL) {
uint64_t new_version = _PyDict_NotifyEvent(interp, PyDict_EVENT_ADDED, mp, key, value);
_PyDict_NotifyEvent(interp, PyDict_EVENT_ADDED, mp, key, value);
STORE_SPLIT_VALUE(mp, ix, Py_NewRef(value));
_PyDictValues_AddToInsertionOrder(mp->ma_values, ix);
STORE_USED(mp, mp->ma_used + 1);
mp->ma_version_tag = new_version;
}
else {
uint64_t new_version = _PyDict_NotifyEvent(interp, PyDict_EVENT_MODIFIED, mp, key, value);
_PyDict_NotifyEvent(interp, PyDict_EVENT_MODIFIED, mp, key, value);
STORE_SPLIT_VALUE(mp, ix, Py_NewRef(value));
mp->ma_version_tag = new_version;
// old_value should be DECREFed after GC track checking is done, if not, it could raise a segmentation fault,
// when dict only holds the strong reference to value in ep->me_value.
Py_DECREF(old_value);
@ -1815,8 +1811,7 @@ insertdict(PyInterpreterState *interp, PyDictObject *mp,
}
if (old_value != value) {
uint64_t new_version = _PyDict_NotifyEvent(
interp, PyDict_EVENT_MODIFIED, mp, key, value);
_PyDict_NotifyEvent(interp, PyDict_EVENT_MODIFIED, mp, key, value);
assert(old_value != NULL);
assert(!_PyDict_HasSplitTable(mp));
if (DK_IS_UNICODE(mp->ma_keys)) {
@ -1827,7 +1822,6 @@ insertdict(PyInterpreterState *interp, PyDictObject *mp,
PyDictKeyEntry *ep = &DK_ENTRIES(mp->ma_keys)[ix];
STORE_VALUE(ep, value);
}
mp->ma_version_tag = new_version;
}
Py_XDECREF(old_value); /* which **CAN** re-enter (see issue #22653) */
ASSERT_CONSISTENT(mp);
@ -1857,8 +1851,7 @@ insert_to_emptydict(PyInterpreterState *interp, PyDictObject *mp,
Py_DECREF(value);
return -1;
}
uint64_t new_version = _PyDict_NotifyEvent(
interp, PyDict_EVENT_ADDED, mp, key, value);
_PyDict_NotifyEvent(interp, PyDict_EVENT_ADDED, mp, key, value);
/* We don't decref Py_EMPTY_KEYS here because it is immortal. */
assert(mp->ma_values == NULL);
@ -1879,7 +1872,6 @@ insert_to_emptydict(PyInterpreterState *interp, PyDictObject *mp,
STORE_VALUE(ep, value);
}
STORE_USED(mp, mp->ma_used + 1);
mp->ma_version_tag = new_version;
newkeys->dk_usable--;
newkeys->dk_nentries++;
// We store the keys last so no one can see them in a partially inconsistent
@ -2612,7 +2604,7 @@ delete_index_from_values(PyDictValues *values, Py_ssize_t ix)
static void
delitem_common(PyDictObject *mp, Py_hash_t hash, Py_ssize_t ix,
PyObject *old_value, uint64_t new_version)
PyObject *old_value)
{
PyObject *old_key;
@ -2622,7 +2614,6 @@ delitem_common(PyDictObject *mp, Py_hash_t hash, Py_ssize_t ix,
assert(hashpos >= 0);
STORE_USED(mp, mp->ma_used - 1);
mp->ma_version_tag = new_version;
if (_PyDict_HasSplitTable(mp)) {
assert(old_value == mp->ma_values->values[ix]);
STORE_SPLIT_VALUE(mp, ix, NULL);
@ -2692,9 +2683,8 @@ delitem_knownhash_lock_held(PyObject *op, PyObject *key, Py_hash_t hash)
}
PyInterpreterState *interp = _PyInterpreterState_GET();
uint64_t new_version = _PyDict_NotifyEvent(
interp, PyDict_EVENT_DELETED, mp, key, NULL);
delitem_common(mp, hash, ix, old_value, new_version);
_PyDict_NotifyEvent(interp, PyDict_EVENT_DELETED, mp, key, NULL);
delitem_common(mp, hash, ix, old_value);
return 0;
}
@ -2740,9 +2730,8 @@ delitemif_lock_held(PyObject *op, PyObject *key,
if (res > 0) {
PyInterpreterState *interp = _PyInterpreterState_GET();
uint64_t new_version = _PyDict_NotifyEvent(
interp, PyDict_EVENT_DELETED, mp, key, NULL);
delitem_common(mp, hash, ix, old_value, new_version);
_PyDict_NotifyEvent(interp, PyDict_EVENT_DELETED, mp, key, NULL);
delitem_common(mp, hash, ix, old_value);
return 1;
} else {
return 0;
@ -2786,11 +2775,9 @@ clear_lock_held(PyObject *op)
}
/* Empty the dict... */
PyInterpreterState *interp = _PyInterpreterState_GET();
uint64_t new_version = _PyDict_NotifyEvent(
interp, PyDict_EVENT_CLEARED, mp, NULL, NULL);
_PyDict_NotifyEvent(interp, PyDict_EVENT_CLEARED, mp, NULL, NULL);
// We don't inc ref empty keys because they're immortal
ensure_shared_on_resize(mp);
mp->ma_version_tag = new_version;
STORE_USED(mp, 0);
if (oldvalues == NULL) {
set_keys(mp, Py_EMPTY_KEYS);
@ -2950,9 +2937,8 @@ _PyDict_Pop_KnownHash(PyDictObject *mp, PyObject *key, Py_hash_t hash,
assert(old_value != NULL);
PyInterpreterState *interp = _PyInterpreterState_GET();
uint64_t new_version = _PyDict_NotifyEvent(
interp, PyDict_EVENT_DELETED, mp, key, NULL);
delitem_common(mp, hash, ix, Py_NewRef(old_value), new_version);
_PyDict_NotifyEvent(interp, PyDict_EVENT_DELETED, mp, key, NULL);
delitem_common(mp, hash, ix, Py_NewRef(old_value));
ASSERT_CONSISTENT(mp);
if (result) {
@ -3717,8 +3703,7 @@ dict_dict_merge(PyInterpreterState *interp, PyDictObject *mp, PyDictObject *othe
(DK_LOG_SIZE(okeys) == PyDict_LOG_MINSIZE ||
USABLE_FRACTION(DK_SIZE(okeys)/2) < other->ma_used)
) {
uint64_t new_version = _PyDict_NotifyEvent(
interp, PyDict_EVENT_CLONED, mp, (PyObject *)other, NULL);
_PyDict_NotifyEvent(interp, PyDict_EVENT_CLONED, mp, (PyObject *)other, NULL);
PyDictKeysObject *keys = clone_combined_dict_keys(other);
if (keys == NULL)
return -1;
@ -3727,7 +3712,6 @@ dict_dict_merge(PyInterpreterState *interp, PyDictObject *mp, PyDictObject *othe
dictkeys_decref(interp, mp->ma_keys, IS_DICT_SHARED(mp));
mp->ma_keys = keys;
STORE_USED(mp, other->ma_used);
mp->ma_version_tag = new_version;
ASSERT_CONSISTENT(mp);
if (_PyObject_GC_IS_TRACKED(other) && !_PyObject_GC_IS_TRACKED(mp)) {
@ -3982,7 +3966,7 @@ copy_lock_held(PyObject *o)
split_copy->ma_values = newvalues;
split_copy->ma_keys = mp->ma_keys;
split_copy->ma_used = mp->ma_used;
split_copy->ma_version_tag = DICT_NEXT_VERSION(interp);
split_copy->_ma_watcher_tag = 0;
dictkeys_incref(mp->ma_keys);
if (_PyObject_GC_IS_TRACKED(mp))
_PyObject_GC_TRACK(split_copy);
@ -4430,7 +4414,6 @@ dict_popitem_impl(PyDictObject *self)
{
Py_ssize_t i, j;
PyObject *res;
uint64_t new_version;
PyInterpreterState *interp = _PyInterpreterState_GET();
ASSERT_DICT_LOCKED(self);
@ -4473,8 +4456,7 @@ dict_popitem_impl(PyDictObject *self)
assert(i >= 0);
key = ep0[i].me_key;
new_version = _PyDict_NotifyEvent(
interp, PyDict_EVENT_DELETED, self, key, NULL);
_PyDict_NotifyEvent(interp, PyDict_EVENT_DELETED, self, key, NULL);
hash = unicode_get_hash(key);
value = ep0[i].me_value;
ep0[i].me_key = NULL;
@ -4489,8 +4471,7 @@ dict_popitem_impl(PyDictObject *self)
assert(i >= 0);
key = ep0[i].me_key;
new_version = _PyDict_NotifyEvent(
interp, PyDict_EVENT_DELETED, self, key, NULL);
_PyDict_NotifyEvent(interp, PyDict_EVENT_DELETED, self, key, NULL);
hash = ep0[i].me_hash;
value = ep0[i].me_value;
ep0[i].me_key = NULL;
@ -4508,7 +4489,6 @@ dict_popitem_impl(PyDictObject *self)
/* We can't dk_usable++ since there is DKIX_DUMMY in indices */
STORE_KEYS_NENTRIES(self->ma_keys, i);
STORE_USED(self, self->ma_used - 1);
self->ma_version_tag = new_version;
ASSERT_CONSISTENT(self);
return res;
}
@ -4759,8 +4739,7 @@ dict_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
PyDictObject *d = (PyDictObject *)self;
d->ma_used = 0;
d->ma_version_tag = DICT_NEXT_VERSION(
_PyInterpreterState_GET());
d->_ma_watcher_tag = 0;
dictkeys_incref(Py_EMPTY_KEYS);
d->ma_keys = Py_EMPTY_KEYS;
d->ma_values = NULL;
@ -7384,7 +7363,7 @@ PyDict_Watch(int watcher_id, PyObject* dict)
if (validate_watcher_id(interp, watcher_id)) {
return -1;
}
((PyDictObject*)dict)->ma_version_tag |= (1LL << watcher_id);
((PyDictObject*)dict)->_ma_watcher_tag |= (1LL << watcher_id);
return 0;
}
@ -7399,7 +7378,7 @@ PyDict_Unwatch(int watcher_id, PyObject* dict)
if (validate_watcher_id(interp, watcher_id)) {
return -1;
}
((PyDictObject*)dict)->ma_version_tag &= ~(1LL << watcher_id);
((PyDictObject*)dict)->_ma_watcher_tag &= ~(1LL << watcher_id);
return 0;
}

4
Python/bytecodes.c
View File

@ -2254,7 +2254,6 @@ dummy_func(
PyObject *name = GETITEM(FRAME_CO_NAMES, oparg);
DEOPT_IF(hint >= (size_t)dict->ma_keys->dk_nentries);
PyObject *old_value;
uint64_t new_version;
DEOPT_IF(!DK_IS_UNICODE(dict->ma_keys));
PyDictUnicodeEntry *ep = DK_UNICODE_ENTRIES(dict->ma_keys) + hint;
DEOPT_IF(ep->me_key != name);
@ -2264,9 +2263,8 @@ dummy_func(
}
old_value = ep->me_value;
PyDict_WatchEvent event = old_value == NULL ? PyDict_EVENT_ADDED : PyDict_EVENT_MODIFIED;
new_version = _PyDict_NotifyEvent(tstate->interp, event, dict, name, PyStackRef_AsPyObjectBorrow(value));
_PyDict_NotifyEvent(tstate->interp, event, dict, name, PyStackRef_AsPyObjectBorrow(value));
ep->me_value = PyStackRef_AsPyObjectSteal(value);
dict->ma_version_tag = new_version; // PEP 509
// old_value should be DECREFed after GC track checking is done, if not, it could raise a segmentation fault,
// when dict only holds the strong reference to value in ep->me_value.
Py_XDECREF(old_value);

4
Python/executor_cases.c.h generated
View File

@ -2625,7 +2625,6 @@
JUMP_TO_JUMP_TARGET();
}
PyObject *old_value;
uint64_t new_version;
if (!DK_IS_UNICODE(dict->ma_keys)) {
UOP_STAT_INC(uopcode, miss);
JUMP_TO_JUMP_TARGET();
@ -2641,9 +2640,8 @@
}
old_value = ep->me_value;
PyDict_WatchEvent event = old_value == NULL ? PyDict_EVENT_ADDED : PyDict_EVENT_MODIFIED;
new_version = _PyDict_NotifyEvent(tstate->interp, event, dict, name, PyStackRef_AsPyObjectBorrow(value));
_PyDict_NotifyEvent(tstate->interp, event, dict, name, PyStackRef_AsPyObjectBorrow(value));
ep->me_value = PyStackRef_AsPyObjectSteal(value);
dict->ma_version_tag = new_version; // PEP 509
// old_value should be DECREFed after GC track checking is done, if not, it could raise a segmentation fault,
// when dict only holds the strong reference to value in ep->me_value.
Py_XDECREF(old_value);

4
Python/generated_cases.c.h generated
View File

@ -6940,7 +6940,6 @@
PyObject *name = GETITEM(FRAME_CO_NAMES, oparg);
DEOPT_IF(hint >= (size_t)dict->ma_keys->dk_nentries, STORE_ATTR);
PyObject *old_value;
uint64_t new_version;
DEOPT_IF(!DK_IS_UNICODE(dict->ma_keys), STORE_ATTR);
PyDictUnicodeEntry *ep = DK_UNICODE_ENTRIES(dict->ma_keys) + hint;
DEOPT_IF(ep->me_key != name, STORE_ATTR);
@ -6950,9 +6949,8 @@
}
old_value = ep->me_value;
PyDict_WatchEvent event = old_value == NULL ? PyDict_EVENT_ADDED : PyDict_EVENT_MODIFIED;
new_version = _PyDict_NotifyEvent(tstate->interp, event, dict, name, PyStackRef_AsPyObjectBorrow(value));
_PyDict_NotifyEvent(tstate->interp, event, dict, name, PyStackRef_AsPyObjectBorrow(value));
ep->me_value = PyStackRef_AsPyObjectSteal(value);
dict->ma_version_tag = new_version; // PEP 509
// old_value should be DECREFed after GC track checking is done, if not, it could raise a segmentation fault,
// when dict only holds the strong reference to value in ep->me_value.
Py_XDECREF(old_value);

4
Python/optimizer_analysis.c
View File

@ -56,14 +56,14 @@ static int
get_mutations(PyObject* dict) {
assert(PyDict_CheckExact(dict));
PyDictObject *d = (PyDictObject *)dict;
return (d->ma_version_tag >> DICT_MAX_WATCHERS) & ((1 << DICT_WATCHED_MUTATION_BITS)-1);
return (d->_ma_watcher_tag >> DICT_MAX_WATCHERS) & ((1 << DICT_WATCHED_MUTATION_BITS)-1);
}
static void
increment_mutations(PyObject* dict) {
assert(PyDict_CheckExact(dict));
PyDictObject *d = (PyDictObject *)dict;
d->ma_version_tag += (1 << DICT_MAX_WATCHERS);
d->_ma_watcher_tag += (1 << DICT_MAX_WATCHERS);
}
/* The first two dict watcher IDs are reserved for CPython,