bpo-9263: Dump Python object on GC assertion failure (GH-10062)
Changes:
* Add _PyObject_AssertFailed() function.
* Add _PyObject_ASSERT() and _PyObject_ASSERT_WITH_MSG() macros.
* gc_decref(): replace assert() with _PyObject_ASSERT_WITH_MSG() to
dump the faulty object if the assertion fails.
_PyObject_AssertFailed() calls:
* _PyMem_DumpTraceback(): try to log the traceback where the object
memory has been allocated if tracemalloc is enabled.
* _PyObject_Dump(): log repr(obj).
* Py_FatalError(): log the current Python traceback.
_PyObject_AssertFailed() uses _PyObject_IsFreed() heuristic to check
if the object memory has been freed by a debug hook on Python memory
allocators.
Initial patch written by David Malcolm.
Co-Authored-By: David Malcolm <dmalcolm@redhat.com>
diff --git a/Include/pymem.h b/Include/pymem.h
index e993628..19f0c8a 100644
--- a/Include/pymem.h
+++ b/Include/pymem.h
@@ -196,7 +196,7 @@
The function does nothing if Python is not compiled is debug mode. */
PyAPI_FUNC(void) PyMem_SetupDebugHooks(void);
-#endif
+#endif /* Py_LIMITED_API */
#ifdef Py_BUILD_CORE
/* Set the memory allocator of the specified domain to the default.