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bpo-36389: _PyObject_CheckConsistency() available in release mode (GH-16612)

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bpo-36389, bpo-38376: The _PyObject_CheckConsistency() function is
now also available in release mode. For example, it can be used to
debug a crash in the visit_decref() function of the GC.

Modify the following functions to also work in release mode:

* _PyDict_CheckConsistency()
* _PyObject_CheckConsistency()
* _PyType_CheckConsistency()
* _PyUnicode_CheckConsistency()

Other changes:

* _PyMem_IsPtrFreed(ptr) now also returns 1 if ptr is NULL
  (equals to 0).
* _PyBytesWriter_CheckConsistency() now returns 1 and is only used
  with assert().
* Reorder _PyObject_Dump() to write safe fields first, and only
  attempt to render repr() at the end.
This commit is contained in:
Victor Stinner 2019-10-07 18:42:01 +02:00 • committed by GitHub
parent 321def805a
commit 6876257eaa
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14 changed files with 155 additions and 140 deletions
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Modules/gcmodule.c
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@ -375,7 +375,6 @@ update_refs(PyGC_Head *containers)
static int
visit_decref(PyObject *op, void *data)
{
assert(op != NULL);
_PyObject_ASSERT(op, !_PyObject_IsFreed(op));
if (PyObject_IS_GC(op)) {