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If conflict resolution makes states unreachable, remove those states,

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report rules that are then unused, and don't report conflicts in those
states.
* src/conflicts.c, src/conflicts.h (conflicts_update_state_numbers):
New global function.
* src/lalr.c, src/lalr.h (lalr_update_state_numbers): New global
function.
* src/main.c (main): After conflict resolution, remove the unreachable
states and update all data structures that reference states by number.
* src/state.c (state_new): Initialize each state's reachable member to
false.
(state_mark_reachable_states): New static function.
(state_remove_unreachable_states): New global function.
* src/state.h (struct state): Add member bool reachable.
(state_remove_unreachable_states): Prototype.
* tests/conflicts.at (Unreachable States After Conflict Resolution):
New test case.
* tests/existing.at (GNU pic Grammar): Update test case output now that
an unused rule is discovered.
This commit is contained in:
Joel E. Denny
2007-05-07 02:56:56 +00:00
parent b09f4f4851
commit 5967f0cf59
10 changed files with 347 additions and 1 deletions
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12
src/lalr.h
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@@ -46,6 +46,18 @@
*/
void lalr (void);
/**
* Update state numbers recorded in #goto_map, #from_state, and #to_state such
* that:
* - \c nstates_old is the old number of states.
* - Where \c i is the old state number, <tt>old_to_new[i]</tt> is either:
* - \c nstates_old if state \c i is removed because it is unreachable.
* Thus, remove all goto entries involving this state.
* - The new state number.
*/
void lalr_update_state_numbers (state_number old_to_new[],
state_number nstates_old);
/** Release the information related to lookahead tokens.