github_mirrors/vectorscan
3
0
Fork 1
mirror of https://github.com/VectorCamp/vectorscan.git synced 2025-06-28 16:41:01 +03:00
Code Issues Packages Projects Releases Wiki Activity

ng_mcclellan: reject determinise if NFA is too big

Browse Source
This commit is contained in:
Justin Viiret 2017-06-26 16:15:23 +10:00 committed by Matthew Barr
parent e8f09aa8c6
commit 2fba9bd16c
1 changed files with 7 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
src/nfagraph/ng_mcclellan.cpp
View File

@ -558,11 +558,16 @@ unique_ptr<raw_dfa> buildMcClellan(const NGHolder &graph,
= (graph.kind == NFA_OUTFIX || finalChance) ? FINAL_DFA_STATE_LIMIT
: DFA_STATE_LIMIT;
unique_ptr<raw_dfa> rdfa = ue2::make_unique<raw_dfa>(graph.kind);
const u32 numStates = num_vertices(graph);
DEBUG_PRINTF("determinising nfa with %u vertices\n", numStates);
if (numStates > FINAL_DFA_STATE_LIMIT) {
DEBUG_PRINTF("rejecting nfa as too many vertices\n");
return nullptr;
}
auto rdfa = ue2::make_unique<raw_dfa>(graph.kind);
if (numStates <= NFA_STATE_LIMIT) {
/* Fast path. Automaton_Graph uses a bitfield internally to represent
* states and is quicker than Automaton_Big. */