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This backports several PRs for gh-113993, making interned strings mortal so they can be garbage-collected when no longer needed.
* Allow interned strings to be mortal, and fix related issues (GH-120520)
* 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.
* Beef up the tests. Cover internal details (marked with `@cpython_only`).
* Add lots of assertions
* Don't immortalize in PyUnicode_InternInPlace; keep immortalizing in other API (GH-121364)
* Switch PyUnicode_InternInPlace to _PyUnicode_InternMortal, clarify docs
* Document immortality in some functions that take `const char *`
This is PyUnicode_InternFromString;
PyDict_SetItemString, PyObject_SetAttrString;
PyObject_DelAttrString; PyUnicode_InternFromString;
and the PyModule_Add convenience functions.
Always point out a non-immortalizing alternative.
* Don't immortalize user-provided attr names in _ctypes
* Immortalize names in code objects to avoid crash (GH-121903)
* Intern latin-1 one-byte strings at startup (GH-122303)
There are some 3.12-specific changes, mainly to allow statically allocated strings in deepfreeze. (In 3.13, deepfreeze switched to the general `_Py_ID`/`_Py_STR`.)
Co-authored-by: Eric Snow <ericsnowcurrently@gmail.com>
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| .. | ||
| cpython | ||
| internal | ||
| abstract.h | ||
| bltinmodule.h | ||
| boolobject.h | ||
| bytearrayobject.h | ||
| bytesobject.h | ||
| ceval.h | ||
| codecs.h | ||
| compile.h | ||
| complexobject.h | ||
| datetime.h | ||
| descrobject.h | ||
| dictobject.h | ||
| dynamic_annotations.h | ||
| enumobject.h | ||
| errcode.h | ||
| exports.h | ||
| fileobject.h | ||
| fileutils.h | ||
| floatobject.h | ||
| frameobject.h | ||
| genericaliasobject.h | ||
| import.h | ||
| interpreteridobject.h | ||
| intrcheck.h | ||
| iterobject.h | ||
| listobject.h | ||
| longobject.h | ||
| marshal.h | ||
| memoryobject.h | ||
| methodobject.h | ||
| modsupport.h | ||
| moduleobject.h | ||
| object.h | ||
| objimpl.h | ||
| opcode.h | ||
| osdefs.h | ||
| osmodule.h | ||
| patchlevel.h | ||
| py_curses.h | ||
| pybuffer.h | ||
| pycapsule.h | ||
| pydtrace.d | ||
| pydtrace.h | ||
| pyerrors.h | ||
| pyexpat.h | ||
| pyframe.h | ||
| pyhash.h | ||
| pylifecycle.h | ||
| pymacconfig.h | ||
| pymacro.h | ||
| pymath.h | ||
| pymem.h | ||
| pyport.h | ||
| pystate.h | ||
| pystats.h | ||
| pystrcmp.h | ||
| pystrtod.h | ||
| Python.h | ||
| pythonrun.h | ||
| pythread.h | ||
| pytypedefs.h | ||
| rangeobject.h | ||
| README.rst | ||
| setobject.h | ||
| sliceobject.h | ||
| structmember.h | ||
| structseq.h | ||
| sysmodule.h | ||
| traceback.h | ||
| tracemalloc.h | ||
| tupleobject.h | ||
| typeslots.h | ||
| unicodeobject.h | ||
| warnings.h | ||
| weakrefobject.h | ||
The Python C API ================ The C API is divided into these sections: 1. ``Include/``: Limited API 2. ``Include/cpython/``: CPython implementation details 3. ``Include/cpython/``, names with the ``PyUnstable_`` prefix: API that can change between minor releases 4. ``Include/internal/``, and any name with ``_`` prefix: The internal API Information on changing the C API is available `in the developer guide`_ .. _in the developer guide: https://devguide.python.org/c-api/