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twa_graph: fix precondition on set_init_state

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Fixes #391.

* spot/twa/twagraph.hh: Here.
* tests/core/dualize.test, tests/python/except.py: New tests.
* NEWS: Mention the bug.
This commit is contained in:
Alexandre Duret-Lutz 2019-07-30 15:30:36 +02:00
parent f29eb91192
commit 8ec6ea838d
4 changed files with 107 additions and 4 deletions
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5
spot/twa/twagraph.hh
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@ -285,7 +285,10 @@ namespace spot
void set_init_state(state_num s)
{
if (SPOT_UNLIKELY(s >= num_states()))
bool univ = is_univ_dest(s);
if (SPOT_UNLIKELY((!univ && s >= num_states())
// univ destinations have at least length 2.
|| (univ && 2 + ~s >= g_.dests_vector().size())))
throw std::invalid_argument
("set_init_state() called with nonexisting state");
init_number_ = s;