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LibRegex: Avoid prepending items to vectors

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This commit is contained in:
Gunnar Beutner 2021-06-13 22:46:21 +02:00 • committed by Ali Mohammad Pur
commit 794dc368f1
Notes: sideshowbarker 2024-07-18 12:15:24 +09:00
1 changed files with 9 additions and 4 deletions
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13
Userland/Libraries/LibRegex/RegexMatcher.cpp
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@ -293,7 +293,7 @@ Optional<bool> Matcher<Parser>::execute(const MatchInput& input, MatchState& sta
if (recursion_level > c_max_recursion)
return false;
Vector<MatchState> fork_low_prio_states;
Vector<MatchState, 64> reversed_fork_low_prio_states;
MatchState fork_high_prio_state;
Optional<bool> success;
@ -323,7 +323,7 @@ Optional<bool> Matcher<Parser>::execute(const MatchInput& input, MatchState& sta
switch (result) {
case ExecutionResult::Fork_PrioLow:
fork_low_prio_states.prepend(state);
reversed_fork_low_prio_states.append(state);
continue;
case ExecutionResult::Fork_PrioHigh:
fork_high_prio_state = state;
@ -344,8 +344,13 @@ Optional<bool> Matcher<Parser>::execute(const MatchInput& input, MatchState& sta
return true;
case ExecutionResult::Failed:
return false;
case ExecutionResult::Failed_ExecuteLowPrioForks:
return execute_low_prio_forks(input, state, output, fork_low_prio_states, recursion_level + 1);
case ExecutionResult::Failed_ExecuteLowPrioForks: {
Vector<MatchState> fork_low_prio_states;
fork_low_prio_states.ensure_capacity(reversed_fork_low_prio_states.size());
for (ssize_t i = reversed_fork_low_prio_states.size() - 1; i >= 0; i--)
fork_low_prio_states.unchecked_append(move(reversed_fork_low_prio_states[i]));
return execute_low_prio_forks(input, state, output, move(fork_low_prio_states), recursion_level + 1);
}
}
}