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twagraph: fix merge_states() on automata without edges

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This corner case was simply causing segfaults.

* tests/python/mergedge.py: Add a test case.
* spot/twa/twagraph.cc (merge_states): Add special handling for
the case where the automaton has no edges.
This commit is contained in:
Alexandre Duret-Lutz 2023-09-20 00:00:15 +02:00
parent 202ab92d1d
commit 858629dd3a
2 changed files with 39 additions and 6 deletions
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22
tests/python/mergedge.py
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@ -1,6 +1,6 @@
#!/usr/bin/python3
# -*- mode: python; coding: utf-8 -*-
# Copyright (C) 2020-2022 Laboratoire de Recherche et Développement de
# Copyright (C) 2020-2023 Laboratoire de Recherche et Développement de
# l'EPITA.
#
# This file is part of Spot, a model checking library.
@ -56,6 +56,26 @@ aut.merge_edges()
tc.assertEqual(aut.num_edges(), 5)
tc.assertTrue(spot.is_deterministic(aut))
aut = spot.automaton("""
HOA: v1
States: 3
Start: 2
AP: 0
Acceptance: 0 t
--BODY--
State: 0
State: 1
State: 2
--END--""")
tc.assertEqual(aut.num_states(), 3)
tc.assertEqual(aut.num_edges(), 0)
tc.assertEqual(aut.get_init_state_number(), 2)
tc.assertEqual(aut.merge_states(), 2);
tc.assertEqual(aut.num_states(), 1)
tc.assertEqual(aut.num_edges(), 0)
tc.assertEqual(aut.get_init_state_number(), 0)
tc.assertEqual(aut.merge_states(), 0);
for nthread in range(1, 16, 2):
aut = spot.automaton("""
HOA: v1