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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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| .. | ||
| pycore_abstract.h | ||
| pycore_asdl.h | ||
| pycore_ast.h | ||
| pycore_ast_state.h | ||
| pycore_atexit.h | ||
| pycore_atomic.h | ||
| pycore_atomic_funcs.h | ||
| pycore_bitutils.h | ||
| pycore_blocks_output_buffer.h | ||
| pycore_bytes_methods.h | ||
| pycore_bytesobject.h | ||
| pycore_call.h | ||
| pycore_ceval.h | ||
| pycore_ceval_state.h | ||
| pycore_code.h | ||
| pycore_compile.h | ||
| pycore_condvar.h | ||
| pycore_context.h | ||
| pycore_descrobject.h | ||
| pycore_dict.h | ||
| pycore_dict_state.h | ||
| pycore_dtoa.h | ||
| pycore_emscripten_signal.h | ||
| pycore_exceptions.h | ||
| pycore_faulthandler.h | ||
| pycore_fileutils.h | ||
| pycore_fileutils_windows.h | ||
| pycore_floatobject.h | ||
| pycore_flowgraph.h | ||
| pycore_format.h | ||
| pycore_frame.h | ||
| pycore_function.h | ||
| pycore_gc.h | ||
| pycore_genobject.h | ||
| pycore_getopt.h | ||
| pycore_gil.h | ||
| pycore_global_objects.h | ||
| pycore_global_objects_fini_generated.h | ||
| pycore_global_strings.h | ||
| pycore_hamt.h | ||
| pycore_hashtable.h | ||
| pycore_import.h | ||
| pycore_initconfig.h | ||
| pycore_instruments.h | ||
| pycore_interp.h | ||
| pycore_intrinsics.h | ||
| pycore_list.h | ||
| pycore_long.h | ||
| pycore_memoryobject.h | ||
| pycore_moduleobject.h | ||
| pycore_namespace.h | ||
| pycore_object.h | ||
| pycore_object_state.h | ||
| pycore_obmalloc.h | ||
| pycore_obmalloc_init.h | ||
| pycore_opcode.h | ||
| pycore_opcode_utils.h | ||
| pycore_parser.h | ||
| pycore_pathconfig.h | ||
| pycore_pyarena.h | ||
| pycore_pyerrors.h | ||
| pycore_pyhash.h | ||
| pycore_pylifecycle.h | ||
| pycore_pymath.h | ||
| pycore_pymem.h | ||
| pycore_pymem_init.h | ||
| pycore_pystate.h | ||
| pycore_pythread.h | ||
| pycore_range.h | ||
| pycore_runtime.h | ||
| pycore_runtime_init.h | ||
| pycore_runtime_init_generated.h | ||
| pycore_signal.h | ||
| pycore_sliceobject.h | ||
| pycore_strhex.h | ||
| pycore_structseq.h | ||
| pycore_symtable.h | ||
| pycore_sysmodule.h | ||
| pycore_time.h | ||
| pycore_token.h | ||
| pycore_traceback.h | ||
| pycore_tracemalloc.h | ||
| pycore_tuple.h | ||
| pycore_typeobject.h | ||
| pycore_typevarobject.h | ||
| pycore_ucnhash.h | ||
| pycore_unicodeobject.h | ||
| pycore_unicodeobject_generated.h | ||
| pycore_unionobject.h | ||
| pycore_warnings.h | ||