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

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* 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
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42 changed files with 2460 additions and 1140 deletions
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Python/ast_opt.c
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@ -273,10 +273,9 @@ parse_literal(PyObject *fmt, Py_ssize_t *ppos, PyArena *arena)
PyObject *str = PyUnicode_Substring(fmt, start, pos);
/* str = str.replace('%%', '%') */
if (str && has_percents) {
_Py_DECLARE_STR(percent, "%");
_Py_DECLARE_STR(dbl_percent, "%%");
Py_SETREF(str, PyUnicode_Replace(str, &_Py_STR(dbl_percent),
&_Py_STR(percent), -1));
_Py_LATIN1_CHR('%'), -1));
}
if (!str) {
return NULL;