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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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| .. | ||
| clinic | ||
| deepfreeze | ||
| frozen_modules | ||
| _warnings.c | ||
| adaptive.md | ||
| asdl.c | ||
| asm_trampoline.S | ||
| assemble.c | ||
| ast.c | ||
| ast_opt.c | ||
| ast_unparse.c | ||
| bltinmodule.c | ||
| bootstrap_hash.c | ||
| bytecodes.c | ||
| ceval.c | ||
| ceval_gil.c | ||
| ceval_macros.h | ||
| codecs.c | ||
| compile.c | ||
| condvar.h | ||
| context.c | ||
| dtoa.c | ||
| dup2.c | ||
| dynamic_annotations.c | ||
| dynload_hpux.c | ||
| dynload_shlib.c | ||
| dynload_stub.c | ||
| dynload_win.c | ||
| emscripten_signal.c | ||
| errors.c | ||
| fileutils.c | ||
| flowgraph.c | ||
| formatter_unicode.c | ||
| frame.c | ||
| frozen.c | ||
| frozenmain.c | ||
| future.c | ||
| generated_cases.c.h | ||
| getargs.c | ||
| getcompiler.c | ||
| getcopyright.c | ||
| getopt.c | ||
| getplatform.c | ||
| getversion.c | ||
| hamt.c | ||
| hashtable.c | ||
| import.c | ||
| importdl.c | ||
| importdl.h | ||
| initconfig.c | ||
| instrumentation.c | ||
| intrinsics.c | ||
| legacy_tracing.c | ||
| makeopcodetargets.py | ||
| marshal.c | ||
| modsupport.c | ||
| mysnprintf.c | ||
| mystrtoul.c | ||
| opcode_metadata.h | ||
| opcode_targets.h | ||
| pathconfig.c | ||
| perf_trampoline.c | ||
| preconfig.c | ||
| pyarena.c | ||
| pyctype.c | ||
| pyfpe.c | ||
| pyhash.c | ||
| pylifecycle.c | ||
| pymath.c | ||
| pystate.c | ||
| pystrcmp.c | ||
| pystrhex.c | ||
| pystrtod.c | ||
| Python-ast.c | ||
| Python-tokenize.c | ||
| pythonrun.c | ||
| pytime.c | ||
| README | ||
| specialize.c | ||
| stdlib_module_names.h | ||
| structmember.c | ||
| suggestions.c | ||
| symtable.c | ||
| sysmodule.c | ||
| thread.c | ||
| thread_nt.h | ||
| thread_pthread.h | ||
| thread_pthread_stubs.h | ||
| traceback.c | ||
| tracemalloc.c | ||
Miscellaneous source files for the main Python shared library