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py/scheduler: Implement VM abort flag and mp_sched_vm_abort().

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This is intended to be used by the very outer caller of the VM/runtime.  It
allows setting a top-level NLR handler that can be jumped to directly, in
order to forcefully abort the VM/runtime.

Enable using:

    #define MICROPY_ENABLE_VM_ABORT (1)

Set up the handler at the top level using:

    nlr_buf_t nlr;
    nlr.ret_val = NULL;
    if (nlr_push(&nlr) == 0) {
        nlr_set_abort(&nlr);
        // call into the VM/runtime
        ...
        nlr_pop();
    } else {
        if (nlr.ret_val == NULL) {
            // handle abort
            ...
        } else {
            // handle other exception that propagated to the top level
            ...
        }
    }
    nlr_set_abort(NULL);

Schedule an abort, eg from an interrupt handler, using:

    mp_sched_vm_abort();

Signed-off-by: Damien George <damien@micropython.org>
This commit is contained in:
Damien George
2022-12-16 17:31:21 +11:00
parent 5d4bfce034
commit d54208a2ff
7 changed files with 62 additions and 2 deletions
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3
py/runtime.h
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@@ -75,6 +75,9 @@ void mp_deinit(void);
void mp_sched_exception(mp_obj_t exc);
void mp_sched_keyboard_interrupt(void);
#if MICROPY_ENABLE_VM_ABORT
void mp_sched_vm_abort(void);
#endif
void mp_handle_pending(bool raise_exc);
#if MICROPY_ENABLE_SCHEDULER