Vincent Imbimbo 2c294c1325 cex: fix state-item pruning ...

There were several bugs in pruning that would leave the state-item
graph in an inconsistent state which could cause crashes later on:

- Pruning now happens in one pass instead of two.

- Disabled state-items no longer prune the state-items they transition
  to if that state-item has other states that transition to it.

- State-items that transition to disabled state-items are always
  pruned even if they have productions.

Reported by Michal Bartkowiak <michal.bartkowiak@nokia.com>
https://lists.gnu.org/r/bug-bison/2021-01/msg00000.html
and Zartaj Majeed
https://github.com/akimd/bison/issues/71

* src/state-item.c (prune_forward, prune_backward): Fuse into...
(prune_state_item): this.
Adjust callers.

2021-01-24 08:24:56 +01:00

155 KiB

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