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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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GPG key ID: 4AEE18F83AFDEB23
14 changed files with 155 additions and 140 deletions
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9
Modules/_testcapimodule.c
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@ -4611,6 +4611,14 @@ test_pyobject_is_freed(const char *test_name, PyObject *op)
}
static PyObject*
check_pyobject_null_is_freed(PyObject *self, PyObject *Py_UNUSED(args))
{
PyObject *op = NULL;
return test_pyobject_is_freed("check_pyobject_null_is_freed", op);
}
static PyObject*
check_pyobject_uninitialized_is_freed(PyObject *self, PyObject *Py_UNUSED(args))
{
@ -5475,6 +5483,7 @@ static PyMethodDef TestMethods[] = {
{"pymem_api_misuse", pymem_api_misuse, METH_NOARGS},
{"pymem_malloc_without_gil", pymem_malloc_without_gil, METH_NOARGS},
{"pymem_getallocatorsname", test_pymem_getallocatorsname, METH_NOARGS},
{"check_pyobject_null_is_freed", check_pyobject_null_is_freed, METH_NOARGS},
{"check_pyobject_uninitialized_is_freed", check_pyobject_uninitialized_is_freed, METH_NOARGS},
{"check_pyobject_forbidden_bytes_is_freed", check_pyobject_forbidden_bytes_is_freed, METH_NOARGS},
{"check_pyobject_freed_is_freed", check_pyobject_freed_is_freed, METH_NOARGS},