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py/modsys: Add optional sys.tracebacklimit attribute.

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With behaviour as per CPython.

Signed-off-by: Damien George <damien@micropython.org>
This commit is contained in:
Damien George
2021-07-27 00:41:27 +10:00
parent bc181550a4
commit cac939ddc3
10 changed files with 117 additions and 3 deletions
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10
py/objexcept.c
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@@ -575,6 +575,16 @@ void mp_obj_exception_add_traceback(mp_obj_t self_in, qstr file, size_t line, qs
// append this traceback info to traceback data
// if memory allocation fails (eg because gc is locked), just return
#if MICROPY_PY_SYS_TRACEBACKLIMIT
mp_int_t max_traceback = MP_OBJ_SMALL_INT_VALUE(MP_STATE_VM(sys_mutable[MP_SYS_MUTABLE_TRACEBACKLIMIT]));
if (max_traceback <= 0) {
return;
} else if (self->traceback_data != NULL && self->traceback_len >= max_traceback * TRACEBACK_ENTRY_LEN) {
self->traceback_len -= TRACEBACK_ENTRY_LEN;
memmove(self->traceback_data, self->traceback_data + TRACEBACK_ENTRY_LEN, self->traceback_len * sizeof(self->traceback_data[0]));
}
#endif
if (self->traceback_data == NULL) {
self->traceback_data = m_new_maybe(size_t, TRACEBACK_ENTRY_LEN);
if (self->traceback_data == NULL) {