commit 0135598d729d01f35ce08d47160adaa095a6149f
author Victor Stinner <vstinner@python.org> Mon Apr 13 11:38:42 2020 +0200
committer GitHub <noreply@github.com> Mon Apr 13 11:38:42 2020 +0200
tree b272b49c6e2ed7b5270f9aeb565fe61a5ff9d634
parent 85dd6bb1f61f7edcd6ac0b640a98644531690a0e

bpo-40241: Add pycore_gc.h header file (GH-19494)

Move the PyGC_Head structure and the following private macros to the
internal C API:

* _PyGCHead_FINALIZED()
* _PyGCHead_NEXT()
* _PyGCHead_PREV()
* _PyGCHead_SET_FINALIZED()
* _PyGCHead_SET_NEXT()
* _PyGCHead_SET_PREV()
* _PyGC_FINALIZED()
* _PyGC_PREV_MASK
* _PyGC_PREV_MASK_COLLECTING
* _PyGC_PREV_MASK_FINALIZED
* _PyGC_PREV_SHIFT
* _PyGC_SET_FINALIZED()
* _PyObject_GC_IS_TRACKED()
* _PyObject_GC_MAY_BE_TRACKED()
* _Py_AS_GC(o)

Keep the private _PyGC_FINALIZED() macro in the public C API for
backward compatibility with Python 3.8: make it an alias to the new
PyObject_GC_IsFinalized() function.

Move the SIZEOF_PYGC_HEAD constant from _testcapi module to
_testinternalcapi module.

Lib/test/test_sys.py

diff --git a/Lib/test/test_sys.py b/Lib/test/test_sys.py
index 3957258..329f7dd 100644
--- a/Lib/test/test_sys.py
+++ b/Lib/test/test_sys.py
@@ -1056,8 +1056,8 @@
     def setUp(self):
         self.P = struct.calcsize('P')
         self.longdigit = sys.int_info.sizeof_digit
-        import _testcapi
-        self.gc_headsize = _testcapi.SIZEOF_PYGC_HEAD
+        import _testinternalcapi
+        self.gc_headsize = _testinternalcapi.SIZEOF_PYGC_HEAD
 
     check_sizeof = test.support.check_sizeof