mirrors/cpython
1
0
Fork 0
mirror of https://github.com/python/cpython.git synced 2025-08-31 05:58:33 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions 7

[3.13] gh-113993: Allow interned strings to be mortal, and fix related issues (GH-120520) (GH-120945)

Browse source 
* Add an InternalDocs file describing how interning should work and how to use it.

* Add internal functions to *explicitly* request what kind of interning is done:
  - `_PyUnicode_InternMortal`
  - `_PyUnicode_InternImmortal`
  - `_PyUnicode_InternStatic`

* Switch uses of `PyUnicode_InternInPlace` to those.

* Disallow using `_Py_SetImmortal` on strings directly.
  You should use `_PyUnicode_InternImmortal` instead:
  - Strings should be interned before immortalization, otherwise you're possibly
    interning a immortalizing copy.
  - `_Py_SetImmortal` doesn't handle the `SSTATE_INTERNED_MORTAL` to
    `SSTATE_INTERNED_IMMORTAL` update, and those flags can't be changed in
    backports, as they are now part of public API and version-specific ABI.

* Add private `_only_immortal` argument for `sys.getunicodeinternedsize`, used in refleak test machinery.

* Make sure the statically allocated string singletons are unique. This means these sets are now disjoint:
  - `_Py_ID`
  - `_Py_STR` (including the empty string)
  - one-character latin-1 singletons

  Now, when you intern a singleton, that exact singleton will be interned.

* Add a `_Py_LATIN1_CHR` macro, use it instead of `_Py_ID`/`_Py_STR` for one-character latin-1 singletons everywhere (including Clinic).

* Intern `_Py_STR` singletons at startup.

* For free-threaded builds, intern `_Py_LATIN1_CHR` singletons at startup.

* Beef up the tests. Cover internal details (marked with `@cpython_only`).

* Add lots of assertions

Co-authored-by: Eric Snow <ericsnowcurrently@gmail.com>
This commit is contained in:
Petr Viktorin 2024-06-24 20:24:19 +02:00 • committed by GitHub
parent 447e07ab3d
commit 9769b7ae06
No known key found for this signature in database
GPG key ID: B5690EEEBB952194
42 changed files with 2460 additions and 1140 deletions
Download patch file Download diff file Expand all files Collapse all files

10
Objects/object.c
View file

@ -1326,7 +1326,8 @@ PyObject_SetAttr(PyObject *v, PyObject *name, PyObject *value)
}
Py_INCREF(name);
PyUnicode_InternInPlace(&name);
PyInterpreterState *interp = _PyInterpreterState_GET();
_PyUnicode_InternMortal(interp, &name);
if (tp->tp_setattro != NULL) {
err = (*tp->tp_setattro)(v, name, value);
Py_DECREF(name);
@ -2409,6 +2410,13 @@ _Py_NewReferenceNoTotal(PyObject *op)
void
_Py_SetImmortalUntracked(PyObject *op)
{
#ifdef Py_DEBUG
// For strings, use _PyUnicode_InternImmortal instead.
if (PyUnicode_CheckExact(op)) {
assert(PyUnicode_CHECK_INTERNED(op) == SSTATE_INTERNED_IMMORTAL
|| PyUnicode_CHECK_INTERNED(op) == SSTATE_INTERNED_IMMORTAL_STATIC);
}
#endif
#ifdef Py_GIL_DISABLED
op->ob_tid = _Py_UNOWNED_TID;
op->ob_ref_local = _Py_IMMORTAL_REFCNT_LOCAL;