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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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GPG key ID: 4AEE18F83AFDEB23
31 changed files with 293 additions and 244 deletions
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5
Include/internal/pycore_object.h
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@ -55,7 +55,6 @@ PyAPI_FUNC(int) _PyObject_IsFreed(PyObject *);
backwards compatible solution */
#define _PyObject_HEAD_INIT(type) \
{ \
_PyObject_EXTRA_INIT \
.ob_refcnt = _Py_IMMORTAL_REFCNT, \
.ob_type = (type) \
},
@ -184,6 +183,8 @@ _PyType_HasFeature(PyTypeObject *type, unsigned long feature) {
extern void _PyType_InitCache(PyInterpreterState *interp);
extern void _PyObject_InitState(PyInterpreterState *interp);
extern void _PyObject_FiniState(PyInterpreterState *interp);
extern bool _PyRefchain_IsTraced(PyInterpreterState *interp, PyObject *obj);
/* Inline functions trading binary compatibility for speed:
_PyObject_Init() is the fast version of PyObject_Init(), and
@ -302,7 +303,7 @@ extern void _PyDebug_PrintTotalRefs(void);
#endif
#ifdef Py_TRACE_REFS
extern void _Py_AddToAllObjects(PyObject *op, int force);
extern void _Py_AddToAllObjects(PyObject *op);
extern void _Py_PrintReferences(PyInterpreterState *, FILE *);
extern void _Py_PrintReferenceAddresses(PyInterpreterState *, FILE *);
#endif