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gh-84436: Make Interned Strings Immortal #102887

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gh-84436: Make Interned Strings Immortal #102887

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546b934
Factor out add_threadstate().
ericsnowcurrently Mar 21, 2023
0bcd136
Add _PyThreadState_InitDetached().
ericsnowcurrently Mar 21, 2023
35d5310
Add _PyThreadState_ClearDetached().
ericsnowcurrently Mar 21, 2023
cba9e34
Add _PyRuntime.cached_objects.main_tstate.
ericsnowcurrently Mar 21, 2023
3b1bb8b
Add _Py_AcquireGlobalObjectsState() and _Py_ReleaseGlobalObjectsState().
ericsnowcurrently Mar 22, 2023
eb42aa1
Add _Py_AddToGlobalDict().
ericsnowcurrently Mar 22, 2023
4e9da2d
Drop _Py_AcquireGlobalObjectsState() and _Py_ReleaseGlobalObjectsStat…
ericsnowcurrently Mar 22, 2023
6216207
Add acquire_global_objects_lock() and release_global_objects_lock().
ericsnowcurrently Mar 22, 2023
3c007c0
Add some TODO comments.
ericsnowcurrently Mar 13, 2023
7d95514
Factor out store_interned().
ericsnowcurrently Mar 20, 2023
5c20b84
Store a thread state to use just for interned strings.
ericsnowcurrently Mar 20, 2023
a3ae02a
Always use the main interpreter when possibly resizing the interned d…
ericsnowcurrently Mar 20, 2023
d5fbc37
Use _PyRuntime.cached_objects.main_tstate instead.
ericsnowcurrently Mar 21, 2023
459325f
Add _PyThreadState_IsBound() and _PyThreadState_Unbind().
ericsnowcurrently Mar 21, 2023
4f25244
Make sure the one-off tstate is bound before using it.
ericsnowcurrently Mar 21, 2023
e68535a
Use _Py_AcquireGlobalObjectsState() in store_interned().
ericsnowcurrently Mar 22, 2023
22753b3
Use _Py_AddToGlobalDict().
ericsnowcurrently Mar 22, 2023
b649a84
Make objects stored in global containers immortal.
ericsnowcurrently Mar 20, 2023
9b0dc99
Immortalize the interned strings dict.
ericsnowcurrently Mar 22, 2023
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Use _Py_AcquireGlobalObjectsState() in store_interned().
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@ericsnowcurrently
ericsnowcurrently committed Mar 22, 2023
commit e68535ada0fe397c7d8c26e6f193b1e008122544
2 changes: 0 additions & 2 deletions Include/internal/pycore_pystate.h
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Expand Up @@ -121,9 +121,7 @@ static inline PyInterpreterState* _PyInterpreterState_GET(void) {
// PyThreadState functions

PyAPI_FUNC(PyThreadState *) _PyThreadState_New(PyInterpreterState *interp);
PyAPI_FUNC(int) _PyThreadState_IsBound(PyThreadState *tstate);
PyAPI_FUNC(void) _PyThreadState_Bind(PyThreadState *tstate);
PyAPI_FUNC(void) _PyThreadState_Unbind(PyThreadState *tstate);
// We keep this around exclusively for stable ABI compatibility.
PyAPI_FUNC(void) _PyThreadState_Init(
PyThreadState *tstate);
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25 changes: 5 additions & 20 deletions Objects/unicodeobject.c
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Expand Up @@ -14585,41 +14585,26 @@ _PyUnicode_InitTypes(PyInterpreterState *interp)
}


static PyThreadState *
get_interned_tstate(void)
{
return &_PyRuntime.cached_objects.main_tstate;
}

static inline PyObject *
store_interned(PyObject *obj)
{
PyObject *interned = get_interned_dict();
assert(interned != NULL);

/* Swap to the main interpreter, if necessary. */
PyThreadState *oldts = NULL;
if (!_Py_IsMainInterpreter(_PyInterpreterState_GET())) {
PyThreadState *main_tstate = get_interned_tstate();
int bound = _PyThreadState_IsBound(main_tstate);
if (!bound) {
_PyThreadState_Bind(main_tstate);
}
oldts = PyThreadState_Swap(main_tstate);
assert(oldts != NULL);
if (!bound) {
_PyThreadState_Unbind(main_tstate);
}
}
PyInterpreterState *interp = _PyInterpreterState_GET();
PyThreadState *oldts = _Py_AcquireGlobalObjectsState(interp);

/* This might trigger a resize, which is why we must "acquire"
the global object state. */
PyObject *t = PyDict_SetDefault(interned, obj, obj);
if (t == NULL) {
PyErr_Clear();
}

/* Swap back. */
if (oldts != NULL) {
PyThreadState_Swap(oldts);
_Py_ReleaseGlobalObjectsState(oldts);
}

return t;
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14 changes: 0 additions & 14 deletions Python/pystate.c
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Expand Up @@ -1923,12 +1923,6 @@ PyThreadState_Swap(PyThreadState *newts)
}


int
_PyThreadState_IsBound(PyThreadState *tstate)
{
return tstate_is_bound(tstate);
}

void
_PyThreadState_Bind(PyThreadState *tstate)
{
Expand All @@ -1940,14 +1934,6 @@ _PyThreadState_Bind(PyThreadState *tstate)
}
}

void
_PyThreadState_Unbind(PyThreadState *tstate)
{
/* For now, we do not allow the initial tstate to be unbound. */
assert(gilstate_tss_get(tstate->interp->runtime) != tstate);
unbind_tstate(tstate);
}


/***********************************/
/* routines for advanced debuggers */
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