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LibRegex: Preserve capture groups and matches across ForkReplace

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This makes the (flawed) ForkStay inserted as a loop header unnecessary,
and finally fixes LibRegex rewriting weird loops in weird ways.
This commit is contained in:
Ali Mohammad Pur 2022-01-21 23:45:33 +03:30 • committed by Linus Groh
parent bc20e4f71d
commit cd83325c7c
2 changed files with 2 additions and 10 deletions
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10
Userland/Libraries/LibRegex/RegexOptimizer.cpp
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@ -223,7 +223,6 @@ void Regex<Parser>::attempt_rewrite_loops_as_atomic_groups(BasicBlockList const&
// -------------------------
// bb1 | RE1
// can be rewritten as:
// loop.hdr | ForkStay bb1 (if RE1 matches _something_, empty otherwise)
// -------------------------
// bb0 | RE0
// | ForkReplaceX bb0
@ -371,15 +370,6 @@ void Regex<Parser>::attempt_rewrite_loops_as_atomic_groups(BasicBlockList const&
} else {
VERIFY_NOT_REACHED();
}
if (candidate.form == AlternateForm::DirectLoopWithoutHeader) {
if (candidate.new_target_block.has_value()) {
// Insert a fork-stay targeted at the second block.
bytecode.insert(candidate.forking_block.start, (ByteCodeValueType)OpCodeId::ForkStay);
bytecode.insert(candidate.forking_block.start + 1, candidate.new_target_block->start - candidate.forking_block.start + 2);
needed_patches.insert(candidate.forking_block.start, 2u);
}
}
}
if (!needed_patches.is_empty()) {