clnhlzmn / makina Goto Github PK

I'd like to use this for very small 8 bit MCUs like STM8 and Pauduk with the SDCC compiler. Unfortunately SDCC does not optimize away the dead assignments, which bloats the generated code considerably.

If I were greedy, I'd also ask for an option to declare the type of the state variable so I could use uint8_t instead of int.

BTW, I really like the description language and the generated code, so clear and clean.

Maybe Graphviz dot format? I'm not sure if that supports nested nodes (for hierarchical states).

In the generated struct <machine> { ... } and struct <machine>_event { ... } there is a void *ctx. The user should be able to specify the type of ctx. Maybe it could be passed on the command line (java -jar makina-compiler --machine-context struct my_type input.mkna) or the generated files could use a macro for that variable's type which would have to be defined by the user.

The generated C for this has unreachable code:

machine unreach;

initial state s {
    on TERMINATE -> .done;
    on I (guard_foo) clear_foo -> done;

    state done {}

    state s1 {
        on I -> done;

        state done {}
    }
}

state done {

}

like so:

static int unreach_s_s1_done(struct unreach *self, struct unreach_event *event) {
        if (!self || !event) return -1;
        switch (event->id) {
        case unreach_event_I:
                if (1) {
                        self->state = NULL;
                        self->state = unreach_s_s1_done;
                        break;
                }
                if (guard_foo(self, event)) {
                        self->state = NULL;
                        clear_foo(self, event);
                        self->state = unreach_s_done;
                        break;
                }
                break;

The if (guard_foo) is unreachable and the C compiler complains about it.