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gh-112529: Remove PyGC_Head from object pre-header in free-threaded build (#114564)

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* gh-112529: Remove PyGC_Head from object pre-header in free-threaded build

This avoids allocating space for PyGC_Head in the free-threaded build.
The GC implementation for free-threaded CPython does not use the
PyGC_Head structure.

 * The trashcan mechanism uses the `ob_tid` field instead of `_gc_prev`
   in the free-threaded build.
 * The GDB libpython.py file now determines the offset of the managed
   dict field based on whether the running process is a free-threaded
   build. Those are identified by the `ob_ref_local` field in PyObject.
 * Fixes `_PySys_GetSizeOf()` which incorrectly incorrectly included the
   size of `PyGC_Head` in the size of static `PyTypeObject`.
This commit is contained in:
Sam Gross 2024-02-01 15:29:19 -05:00 • committed by GitHub
parent 500ede0117
commit 587d480203
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GPG key ID: B5690EEEBB952194
9 changed files with 86 additions and 26 deletions
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12
Modules/_testinternalcapi.c
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@ -1752,8 +1752,18 @@ module_exec(PyObject *module)
return 1;
}
Py_ssize_t sizeof_gc_head = 0;
#ifndef Py_GIL_DISABLED
sizeof_gc_head = sizeof(PyGC_Head);
#endif
if (PyModule_Add(module, "SIZEOF_PYGC_HEAD",
PyLong_FromSsize_t(sizeof(PyGC_Head))) < 0) {
PyLong_FromSsize_t(sizeof_gc_head)) < 0) {
return 1;
}
if (PyModule_Add(module, "SIZEOF_MANAGED_PRE_HEADER",
PyLong_FromSsize_t(2 * sizeof(PyObject*))) < 0) {
return 1;
}