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smallwrite: bfs ordering, refine daddy selection

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This commit is contained in:
Justin Viiret 2017-04-11 13:56:51 +10:00 committed by Matthew Barr
parent 3b3f6b739c
commit 10f52346ca
2 changed files with 18 additions and 3 deletions
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14
src/nfa/mcclellancompile.cpp
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@ -841,9 +841,17 @@ void find_better_daddy(dfa_info &info, dstate_id_t curr_id, bool using8bit,
flat_set<dstate_id_t> hinted;
if (trust_daddy_states) {
hinted.insert(currState.daddy);
addIfEarlier(hinted, info.raw.start_floating, curr_id);
addIfEarlier(hinted, info.raw.start_anchored, curr_id);
// Use the daddy already set for this state so long as it isn't already
// a Sherman state.
if (!info.is_sherman(currState.daddy)) {
hinted.insert(currState.daddy);
} else {
// Fall back to granddaddy, which has already been processed (due
// to BFS ordering) and cannot be a Sherman state.
dstate_id_t granddaddy = info.states[currState.daddy].daddy;
assert(!info.is_sherman(granddaddy));
hinted.insert(granddaddy);
}
} else {
hinted = find_daddy_candidates(info, curr_id);
}

7
src/smallwrite/smallwrite_build.cpp
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@ -452,6 +452,13 @@ void buildAutomaton(LitTrie &trie,
ACVisitor ac_vis(trie, failure_map, ordering);
boost::breadth_first_search(trie, trie.root, visitor(ac_vis));
// Renumber with BFS ordering, which is assumed by other DFA construction
// code (i.e. Sherman state computation).
size_t idx = 0;
for (auto v : ordering) {
trie[v].index = idx++;
}
// Compute missing edges from failure map.
for (auto v : ordering) {
DEBUG_PRINTF("vertex %zu\n", trie[v].index);