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Early duplicate state detection in channels

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These checks allows the emulator to abort at the moment in which two
consecutive states are going to be emitted by the channel, showing the
culpirit in the backtrace. Waiting for the check in chan_emit() hides
the source of the problem.
This commit is contained in:
Rodrigo Arias 2021-11-19 16:22:37 +01:00
parent 9944b391ae
commit cddda71cfb
1 changed files with 63 additions and 1 deletions
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64
chan.c
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@ -172,6 +172,25 @@ chan_set(struct ovni_chan *chan, int st)
assert(chan->enabled);
/* Only chan_set can set the 0 state */
if(st < 0)
{
err("chan_set: cannot set a negative state %d\n", st);
abort();
}
/* Don't enforce this check if we are dirty because the channel was
* just enabled; it may collide with a new state 0 set via chan_set()
* used by the tracking channels */
if(chan->dirty != CHAN_DIRTY_ACTIVE
&& chan->lastst >= 0
&& chan->lastst == st)
{
err("chan_set id=%d cannot emit the state %d twice\n",
chan->id, st);
abort();
}
if(chan->n == 0)
chan->n = 1;
@ -205,9 +224,22 @@ chan_push(struct ovni_chan *chan, int st)
assert(chan->enabled);
if(st <= 0)
{
err("chan_push: cannot push a non-positive state %d\n", st);
abort();
}
/* Cannot be dirty */
assert(chan->dirty == 0);
if(chan->lastst >= 0 && chan->lastst == st)
{
err("chan_push id=%d cannot emit the state %d twice\n",
chan->id, st);
abort();
}
if(chan->n >= MAX_CHAN_STACK)
{
err("channel stack full\n");
@ -248,6 +280,24 @@ chan_pop(struct ovni_chan *chan, int expected_st)
}
chan->n--;
/* Take the current stack value */
st = chan_get_st(chan);
/* A st == 0 can be obtained when returning to the initial state */
if(st < 0)
{
err("chan_pop: obtained negative state %d from the stack\n", st);
abort();
}
if(chan->lastst >= 0 && chan->lastst == st)
{
err("chan_pop id=%d cannot emit the state %d twice\n",
chan->id, st);
abort();
}
chan->t = *chan->clock;
mark_dirty(chan, CHAN_DIRTY_VALUE);
@ -264,7 +314,19 @@ chan_ev(struct ovni_chan *chan, int ev)
/* Cannot be dirty */
assert(chan->dirty == 0);
assert(ev >= 0);
if(ev <= 0)
{
err("chan_ev: cannot emit non-positive state %d\n", ev);
abort();
}
if(chan->lastst >= 0 && chan->lastst == ev)
{
err("chan_ev id=%d cannot emit the state %d twice\n",
chan->id, ev);
abort();
}
chan->ev = ev;
chan->t = *chan->clock;