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

lookarounds: don't reconfirm bytes in hwlm mask

Browse Source
This commit is contained in:
Justin Viiret 2017-06-20 17:34:17 +10:00 committed by Matthew Barr
parent 7560e189eb
commit 72387e0de4
1 changed files with 16 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

23
src/rose/rose_build_program.cpp
View File

@ -1288,19 +1288,28 @@ void makeCheckLitMaskInstruction(const RoseBuildImpl &build, u32 lit_id,
vector<LookEntry> look;
const ue2_literal &s = build.literals.at(lit_id).s;
const auto &lit = build.literals.at(lit_id);
const ue2_literal &s = lit.s;
const auto &msk = lit.msk;
DEBUG_PRINTF("building mask for lit %u: %s\n", lit_id,
dumpString(s).c_str());
assert(s.length() <= MAX_MASK2_WIDTH);
s32 i = 0 - s.length();
for (const auto &e : s) {
if (!e.nocase) {
look.emplace_back(verify_s8(i), e);
// Note: the literal matcher will confirm the HWLM mask in lit.msk, so we
// do not include those entries in the lookaround.
auto it = s.begin();
for (s32 i = 0 - s.length(), i_end = 0 - msk.size(); i < i_end; ++i, ++it) {
if (!it->nocase) {
look.emplace_back(verify_s8(i), *it);
}
i++;
}
assert(!look.empty());
if (look.empty()) {
return; // all caseful chars handled by HWLM mask.
}
makeLookaroundInstruction(look, program);
}