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properly consider report behaviour when finding start verts

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Alex Coyte 2016-09-29 10:42:43 +10:00 committed by Matthew Barr
parent b9650d4fd0
commit 924089d95e
1 changed files with 11 additions and 1 deletions
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12
src/nfagraph/ng_limex.cpp
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@ -344,6 +344,13 @@ void attemptToUseAsStart(const NGHolder &g, NFAVertex u,
if (!contains(unhandled_succ_tops, v)) {
return;
}
/* if it has vacuous reports we need to make sure that the report sets
* are the same */
if ((v == g.accept || v == g.acceptEod)
&& g[g.start].reports != g[u].reports) {
DEBUG_PRINTF("different report behaviour\n");
return;
}
const flat_set<u32> &v_tops = unhandled_succ_tops.at(v);
flat_set<u32> new_inter;
auto ni_inserter = inserter(new_inter, new_inter.end());
@ -362,6 +369,7 @@ void attemptToUseAsStart(const NGHolder &g, NFAVertex u,
return;
}
DEBUG_PRINTF("reusing %u is a start vertex\n", g[u].index);
markTopSuccAsHandled(u, top_inter, succs, tops_out, unhandled_top_succs,
unhandled_succ_tops);
}
@ -377,6 +385,7 @@ void reusePredsAsStarts(const NGHolder &g, const map<u32, CharReach> &top_reach,
map<u32, set<NFAVertex>> &tops_out) {
/* create list of candidates first, to avoid issues of iter invalidation
* and determinism */
DEBUG_PRINTF("attempting to reuse vertices for top starts\n");
vector<NFAVertex> cand_starts;
for (NFAVertex u : unhandled_succ_tops | map_keys) {
if (hasSelfLoop(u, g)) {
@ -434,6 +443,7 @@ void makeTopStates(NGHolder &g, map<u32, set<NFAVertex>> &tops_out,
while (!unhandled_succ_tops.empty()) {
assert(!unhandled_top_succs.empty());
DEBUG_PRINTF("creating top start vertex\n");
flat_set<u32> u_tops;
flat_set<NFAVertex> u_succs;
pickNextTopStateToHandle(unhandled_top_succs, unhandled_succ_tops,
@ -473,7 +483,7 @@ set<NFAVertex> findZombies(const NGHolder &h,
}
if (in_degree(h.acceptEod, h) != 1 || all_reports(h).size() != 1) {
DEBUG_PRINTF("can be made undead - bad reports\n");
DEBUG_PRINTF("cannot be made undead - bad reports\n");
return zombies;
}