static
aligned_unique_ptr<NFA> prepEngine(raw_dfa &rdfa, u32 roseQuality,
const CompileContext &cc,
const ReportManager &rm, u32 *start_offset,
u32 *small_region) {
*start_offset = remove_leading_dots(rdfa);
// Unleash the McClellan!
set<dstate_id_t> accel_states;
auto nfa = mcclellanCompile(rdfa, cc, rm, &accel_states);
if (!nfa) {
DEBUG_PRINTF("mcclellan compile failed for smallwrite NFA\n");
return nullptr;
}
if (is_slow(rdfa, accel_states, roseQuality)) {
DEBUG_PRINTF("is slow\n");
*small_region = cc.grey.smallWriteLargestBufferBad;
if (*small_region <= *start_offset) {
return nullptr;
}
if (prune_overlong(rdfa, *small_region - *start_offset)) {
if (rdfa.start_anchored == DEAD_STATE) {
DEBUG_PRINTF("all patterns pruned out\n");
return nullptr;
}
nfa = mcclellanCompile(rdfa, cc, rm, &accel_states);
if (!nfa) {
DEBUG_PRINTF("mcclellan compile failed for smallwrite NFA\n");
assert(0); /* able to build orig dfa but not the trimmed? */
return nullptr;
}
}
} else {
*small_region = cc.grey.smallWriteLargestBuffer;
}
assert(isMcClellanType(nfa->type));
if (nfa->length > cc.grey.limitSmallWriteOutfixSize
|| nfa->length > cc.grey.limitDFASize) {
DEBUG_PRINTF("smallwrite outfix size too large\n");
return nullptr; /* this is just a soft failure - don't build smwr */
}
nfa->queueIndex = 0; /* dummy, small write API does not use queue */
return nfa;
}
static
aligned_unique_ptr<NFA> getDfa(raw_dfa &rdfa, const CompileContext &cc,
const ReportManager &rm,
set<dstate_id_t> &accel_states) {
aligned_unique_ptr<NFA> dfa = nullptr;
if (cc.grey.allowSmallWriteSheng) {
dfa = shengCompile(rdfa, cc, rm, &accel_states);
}
if (!dfa) {
dfa = mcclellanCompile(rdfa, cc, rm, &accel_states);
}
return dfa;
}