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gh-127119: Remove check on accidental deallocation of immortal objects for free-threaded build by eendebakpt · Pull Request #127120 · python/cpython · GitHub
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gh-127119: Remove check on accidental deallocation of immortal objects for free-threaded build #127120

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gh-127119: Remove check on accidental deallocation of immortal objects for free-threaded build #127120

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19d64f0
Remove check on small ints in long_dealloc
eendebakpt Nov 21, 2024
4117c54
rewrite assert
eendebakpt Nov 22, 2024
38862e3
📜🤖 Added by blurb_it.
blurb-it[bot] Nov 22, 2024
a82a6ab
Merge branch 'main' into small_int_immortal
eendebakpt Nov 22, 2024
d8c318d
avoid warnings in release builds by using Py_DEBUG
eendebakpt Nov 22, 2024
0cd1eba
Update Misc/NEWS.d/next/Core_and_Builtins/2024-11-22-07-58-00.gh-issu…
eendebakpt Nov 22, 2024
4dc97c9
Merge branch 'main' into small_int_immortal
eendebakpt Nov 22, 2024
2c23541
use NDEBUG
eendebakpt Nov 22, 2024
7d3a012
Merge branch 'main' into small_int_immortal
eendebakpt Nov 22, 2024
00b735f
Merge branch 'small_int_immortal' of github.com:eendebakpt/cpython in…
eendebakpt Nov 22, 2024
ea17aee
whitespace
eendebakpt Nov 22, 2024
312c790
Merge branch 'main' into small_int_immortal
eendebakpt Nov 22, 2024
fe0076c
Merge branch 'main' into small_int_immortal
eendebakpt Nov 22, 2024
0837699
keep check in stable ABI build
eendebakpt Nov 24, 2024
0764241
typo
eendebakpt Nov 24, 2024
56f4133
review comments
eendebakpt Nov 25, 2024
8f6bf27
apply same rule to all cases
eendebakpt Dec 7, 2024
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keep check in stable ABI build
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@eendebakpt
eendebakpt committed Nov 24, 2024
commit 08376995b468ecaa8c85965cef0af11c9f82828b
25 changes: 13 additions & 12 deletions Objects/longobject.c
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Original file line number Diff line number Diff line change
Expand Up @@ -3611,28 +3611,29 @@ long_richcompare(PyObject *self, PyObject *other, int op)
Py_RETURN_RICHCOMPARE(result, 0, op);
}

#ifndef NDEBUG
static int _is_python_smallint(PyObject *op)
long_dealloc(PyObject *self)
{
PyLongObject *pylong = (PyLongObject*)op;
#ifdef Py_LIMITED_API
#ifndef Py_GIL_DISABLED

@ZeroIntensity ZeroIntensity Nov 25, 2024

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I'm not sure it's possible for us to know when we're using the limited API. Py_LIMITED_API is something that affects Python.h at the compile-time of an extension module, but this happens during the compilation of CPython, so it will never be true.

/* This should never get called, but we also don't want to SEGV if
* we accidentally decref small Ints out of existence. Instead,
* since small Ints are immortal, re-set the reference count.
*
* See PEP 683, section Accidental De-Immortalizing for details
*/
PyLongObject *pylong = (PyLongObject*)self;
if (pylong && _PyLong_IsCompact(pylong)) {
stwodigits ival = medium_value(pylong);
if (IS_SMALL_INT(ival)) {
PyLongObject *small_pylong = (PyLongObject *)get_small_int((sdigit)ival);
if (pylong == small_pylong) {
return 1;
_Py_SetImmortal(self);
return;
}
}
}
return 0;
}
#endif

static void
long_dealloc(PyObject *self)
{
// assert the small ints are not deallocated
assert(!_is_python_smallint(self));
#endif
Py_TYPE(self)->tp_free(self);
}

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