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Add PYTHONMALLOC env var

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Issue #26516:

* Add PYTHONMALLOC environment variable to set the Python memory
  allocators and/or install debug hooks.
* PyMem_SetupDebugHooks() can now also be used on Python compiled in release
  mode.
* The PYTHONMALLOCSTATS environment variable can now also be used on Python
  compiled in release mode. It now has no effect if set to an empty string.
* In debug mode, debug hooks are now also installed on Python memory allocators
  when Python is configured without pymalloc.
This commit is contained in:
Victor Stinner 2016-03-14 12:04:26 +01:00
parent c877658d1f
commit 34be807ca4
13 changed files with 383 additions and 90 deletions
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29
Modules/_testcapimodule.c
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@ -3616,6 +3616,33 @@ get_recursion_depth(PyObject *self, PyObject *args)
return PyLong_FromLong(tstate->recursion_depth - 1);
}
static PyObject*
pymem_buffer_overflow(PyObject *self, PyObject *args)
{
char *buffer;
/* Deliberate buffer overflow to check that PyMem_Free() detects
the overflow when debug hooks are installed. */
buffer = PyMem_Malloc(16);
buffer[16] = 'x';
PyMem_Free(buffer);
Py_RETURN_NONE;
}
static PyObject*
pymem_api_misuse(PyObject *self, PyObject *args)
{
char *buffer;
/* Deliberate misusage of Python allocators:
allococate with PyMem but release with PyMem_Raw. */
buffer = PyMem_Malloc(16);
PyMem_RawFree(buffer);
Py_RETURN_NONE;
}
static PyMethodDef TestMethods[] = {
{"raise_exception", raise_exception, METH_VARARGS},
@ -3798,6 +3825,8 @@ static PyMethodDef TestMethods[] = {
{"PyTime_AsMilliseconds", test_PyTime_AsMilliseconds, METH_VARARGS},
{"PyTime_AsMicroseconds", test_PyTime_AsMicroseconds, METH_VARARGS},
{"get_recursion_depth", get_recursion_depth, METH_NOARGS},
{"pymem_buffer_overflow", pymem_buffer_overflow, METH_NOARGS},
{"pymem_api_misuse", pymem_api_misuse, METH_NOARGS},
{NULL, NULL} /* sentinel */
};