The __get_state_variables() method parses DOT files to identify the automaton's initial state. If the input file lacks a node with the required initialization prefix, the initial_state variable is referenced before assignment, causing an UnboundLocalError or a generic error during the state removal step.
Initialize the variable explicitly and validate that a start node was found after parsing. Raise a descriptive AutomataError if the definition is missing to improve debugging and ensure the automaton is valid. Signed-off-by: Wander Lairson Costa <[email protected]> Reviewed-by: Gabriele Monaco <[email protected]> --- tools/verification/rvgen/rvgen/automata.py | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/tools/verification/rvgen/rvgen/automata.py b/tools/verification/rvgen/rvgen/automata.py index fd2a4a0c3f6eb..ac765c9b2dece 100644 --- a/tools/verification/rvgen/rvgen/automata.py +++ b/tools/verification/rvgen/rvgen/automata.py @@ -145,6 +145,7 @@ class Automata: # wait for node declaration states = [] final_states = [] + initial_state = "" has_final_states = False cursor = self.__get_cursor_begin_states() @@ -171,6 +172,9 @@ class Automata: final_states.append(state) has_final_states = True + if not initial_state: + raise AutomataError("The automaton doesn't have an initial state") + states = sorted(set(states)) states.remove(initial_state) -- 2.53.0
