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gh-108634: Py_TRACE_REFS uses a hash table (#108663)

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Python built with "configure --with-trace-refs" (tracing references)
is now ABI compatible with Python release build and debug build.
Moreover, it now also supports the Limited API.

Change Py_TRACE_REFS build:

* Remove _PyObject_EXTRA_INIT macro.
* The PyObject structure no longer has two extra members (_ob_prev
  and _ob_next).
* Use a hash table (_Py_hashtable_t) to trace references (all
  objects): PyInterpreterState.object_state.refchain.
* Py_TRACE_REFS build is now ABI compatible with release build and
  debug build.
* Limited C API extensions can now be built with Py_TRACE_REFS:
  xxlimited, xxlimited_35, _testclinic_limited.
* No longer rename PyModule_Create2() and PyModule_FromDefAndSpec2()
  functions to PyModule_Create2TraceRefs() and
  PyModule_FromDefAndSpec2TraceRefs().
* _Py_PrintReferenceAddresses() is now called before
  finalize_interp_delete() which deletes the refchain hash table.
* test_tracemalloc find_trace() now also filters by size to ignore
  the memory allocated by _PyRefchain_Trace().

Test changes for Py_TRACE_REFS:

* Add test.support.Py_TRACE_REFS constant.
* Add test_sys.test_getobjects() to test sys.getobjects() function.
* test_exceptions skips test_recursion_normalizing_with_no_memory()
  and test_memory_error_in_PyErr_PrintEx() if Python is built with
  Py_TRACE_REFS.
* test_repl skips test_no_memory().
* test_capi skisp test_set_nomemory().
This commit is contained in:
Victor Stinner 2023-08-31 18:33:34 +02:00 • committed by GitHub
parent 013a99a47b
commit 13a00078b8
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31 changed files with 293 additions and 244 deletions
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21
Lib/test/test_sys.py
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@ -1174,6 +1174,27 @@ class SysModuleTest(unittest.TestCase):
self.assertEqual(os.path.normpath(sys._stdlib_dir),
os.path.normpath(expected))
@unittest.skipUnless(hasattr(sys, 'getobjects'), 'need sys.getobjects()')
def test_getobjects(self):
# sys.getobjects(0)
all_objects = sys.getobjects(0)
self.assertIsInstance(all_objects, list)
self.assertGreater(len(all_objects), 0)
# sys.getobjects(0, MyType)
class MyType:
pass
size = 100
my_objects = [MyType() for _ in range(size)]
get_objects = sys.getobjects(0, MyType)
self.assertEqual(len(get_objects), size)
for obj in get_objects:
self.assertIsInstance(obj, MyType)
# sys.getobjects(3, MyType)
get_objects = sys.getobjects(3, MyType)
self.assertEqual(len(get_objects), 3)
@test.support.cpython_only
class UnraisableHookTest(unittest.TestCase):