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Rework the creation of startDs edges in fillHolderForLockCheck().

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This prevents clearing of edges created for virtual starts in late regions.
This commit is contained in:
Alex Coyte 2016-11-22 13:48:00 +11:00 committed by Matthew Barr
parent 8b94eb86f8
commit eb7759361d
1 changed files with 22 additions and 14 deletions
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36
src/nfagraph/ng_som.cpp
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@ -685,27 +685,22 @@ void fillHolderForLockCheck(NGHolder *out, const NGHolder &g,
map<u32, region_info>::const_iterator picked) {
/* NOTE: This is appropriate for firstMatchIsFirst */
DEBUG_PRINTF("prepping for lock check\n");
NGHolder &midfix = *out;
add_edge(midfix.startDs, midfix.accept, midfix);
map<NFAVertex, NFAVertex> v_map;
v_map[g.start] = midfix.start;
v_map[g.startDs] = midfix.startDs;
map<u32, region_info>::const_iterator jt = picked;
/* include the lock region */
assert(jt != info.end());
++jt;
assert(!jt->second.dag);
assert(jt->second.full.size() == 1);
assert(picked != info.end());
auto graph_last = next(picked);
for (; ; --jt) {
assert(!graph_last->second.dag);
assert(graph_last->second.full.size() == 1);
for (auto jt = graph_last; ; --jt) {
DEBUG_PRINTF("adding r %u to midfix\n", jt->first);
if (!jt->second.optional) {
clear_out_edges(midfix.startDs, midfix);
add_edge(midfix.startDs, midfix.startDs, midfix);
}
/* add all vertices in region, create mapping */
for (auto v : jt->second.full) {
@ -741,14 +736,27 @@ void fillHolderForLockCheck(NGHolder *out, const NGHolder &g,
}
}
/* add edges from startds to enters */
if (jt == info.begin()) {
break;
}
}
/* add edges from startds to the enters of all the initial optional
* regions and the first mandatory region. */
for (auto jt = info.begin(); ; ++jt) {
for (auto enter : jt->second.enters) {
assert(contains(v_map, enter));
NFAVertex v = v_map[enter];
add_edge_if_not_present(midfix.startDs, v, midfix);
}
if (jt == info.begin()) {
if (!jt->second.optional) {
break;
}
if (jt == graph_last) {
/* all regions are optional - add a direct edge to accept */
add_edge_if_not_present(midfix.startDs, midfix.accept, midfix);
break;
}
}