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

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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 2024-06-21 17:19:31 +02:00 • committed by GitHub
parent 7595e6743a
commit 6f1d448bc1
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42 changed files with 2464 additions and 1140 deletions
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4
Modules/_sqlite/clinic/connection.c.h generated
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@ -844,7 +844,7 @@ pysqlite_connection_set_progress_handler(pysqlite_Connection *self, PyTypeObject
PyObject *ob_item[NUM_KEYWORDS];
} _kwtuple = {
.ob_base = PyVarObject_HEAD_INIT(&PyTuple_Type, NUM_KEYWORDS)
.ob_item = { &_Py_ID(progress_handler), &_Py_ID(n), },
.ob_item = { &_Py_ID(progress_handler), _Py_LATIN1_CHR('n'), },
};
#undef NUM_KEYWORDS
#define KWTUPLE (&_kwtuple.ob_base.ob_base)
@ -1866,4 +1866,4 @@ exit:
#ifndef DESERIALIZE_METHODDEF
#define DESERIALIZE_METHODDEF
#endif /* !defined(DESERIALIZE_METHODDEF) */
/*[clinic end generated code: output=7d41a178b7b2b683 input=a9049054013a1b77]*/
/*[clinic end generated code: output=5d4d7e4abe17b164 input=a9049054013a1b77]*/