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LibRegex: Pull out the first compare to avoid unnecessary execution
This adds a fast-path to drop view indices we know will not match immediately without going through the regex VM.
This commit is contained in:
Ali Mohammad Pur
Andreas Kling
parent
76f5dce3db
commit
446a453719
Notes:
github-actions[bot]
2025-04-18 15:10:31 +00:00
Author: https://github.com/alimpfard Commit: https://github.com/LadybirdBrowser/ladybird/commit/446a453719b Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/4375
4 changed files with 250 additions and 117 deletions
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@ -4,6 +4,7 @@
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/BinarySearch.h>
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#include <AK/BumpAllocator.h>
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#include <AK/ByteString.h>
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#include <AK/Debug.h>
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@ -208,6 +209,23 @@ RegexResult Matcher<Parser>::match(Vector<RegexStringView> const& views, Optiona
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auto single_match_only = input.regex_options.has_flag_set(AllFlags::SingleMatch);
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auto only_start_of_line = m_pattern->parser_result.optimization_data.only_start_of_line && !input.regex_options.has_flag_set(AllFlags::Multiline);
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auto compare_range = [insensitive = input.regex_options & AllFlags::Insensitive](auto needle, CharRange range) {
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auto upper_case_needle = needle;
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auto lower_case_needle = needle;
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if (insensitive) {
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upper_case_needle = to_ascii_uppercase(needle);
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lower_case_needle = to_ascii_lowercase(needle);
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}
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if (lower_case_needle >= range.from && lower_case_needle <= range.to)
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return 0;
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if (upper_case_needle >= range.from && upper_case_needle <= range.to)
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return 0;
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if (lower_case_needle > range.to || upper_case_needle > range.to)
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return 1;
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return -1;
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};
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for (auto const& view : views) {
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if (lines_to_skip != 0) {
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++input.line;
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@ -253,19 +271,26 @@ RegexResult Matcher<Parser>::match(Vector<RegexStringView> const& views, Optiona
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}
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for (; view_index <= view_length; ++view_index) {
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if (view_index == view_length && input.regex_options.has_flag_set(AllFlags::Multiline))
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break;
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if (view_index == view_length) {
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if (input.regex_options.has_flag_set(AllFlags::Multiline))
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break;
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}
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auto& match_length_minimum = m_pattern->parser_result.match_length_minimum;
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// FIXME: More performant would be to know the remaining minimum string
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// length needed to match from the current position onwards within
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// the vm. Add new OpCode for MinMatchLengthFromSp with the value of
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// the remaining string length from the current path. The value though
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// has to be filled in reverse. That implies a second run over bytecode
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// after generation has finished.
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auto const match_length_minimum = m_pattern->parser_result.match_length_minimum;
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if (match_length_minimum && match_length_minimum > view_length - view_index)
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break;
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if (auto& starting_ranges = m_pattern->parser_result.optimization_data.starting_ranges; !starting_ranges.is_empty()) {
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if (!binary_search(starting_ranges, input.view.code_unit_at(view_index), nullptr, compare_range))
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goto done_matching;
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}
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input.column = match_count;
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input.match_index = match_count;
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@ -274,8 +299,7 @@ RegexResult Matcher<Parser>::match(Vector<RegexStringView> const& views, Optiona
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state.instruction_position = 0;
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state.repetition_marks.clear();
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auto success = execute(input, state, operations);
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if (success) {
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if (execute(input, state, operations)) {
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succeeded = true;
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if (input.regex_options.has_flag_set(AllFlags::MatchNotEndOfLine) && state.string_position == input.view.length()) {
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@ -315,6 +339,7 @@ RegexResult Matcher<Parser>::match(Vector<RegexStringView> const& views, Optiona
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break;
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}
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done_matching:
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if (!continue_search || only_start_of_line)
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break;
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}
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@ -230,6 +230,7 @@ private:
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void run_optimization_passes();
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void attempt_rewrite_loops_as_atomic_groups(BasicBlockList const&);
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bool attempt_rewrite_entire_match_as_substring_search(BasicBlockList const&);
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void fill_optimization_data(BasicBlockList const&);
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};
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// free standing functions for match, search and has_match
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@ -36,15 +36,211 @@ void Regex<Parser>::run_optimization_passes()
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// e.g. a*b -> (ATOMIC a*)b
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attempt_rewrite_loops_as_atomic_groups(blocks);
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// FIXME: "There are a few more conditions this can be true in (e.g. within an arbitrarily nested capture group)"
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auto state = MatchState::only_for_enumeration();
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auto& opcode = parser_result.bytecode.get_opcode(state);
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if (opcode.opcode_id() == OpCodeId::CheckBegin)
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parser_result.optimization_data.only_start_of_line = true;
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fill_optimization_data(split_basic_blocks(parser_result.bytecode));
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parser_result.bytecode.flatten();
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}
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struct StaticallyInterpretedCompares {
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RedBlackTree<u32, u32> lhs_ranges;
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RedBlackTree<u32, u32> lhs_negated_ranges;
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HashTable<CharClass> lhs_char_classes;
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HashTable<CharClass> lhs_negated_char_classes;
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bool has_any_unicode_property = false;
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HashTable<Unicode::GeneralCategory> lhs_unicode_general_categories;
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HashTable<Unicode::Property> lhs_unicode_properties;
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HashTable<Unicode::Script> lhs_unicode_scripts;
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HashTable<Unicode::Script> lhs_unicode_script_extensions;
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HashTable<Unicode::GeneralCategory> lhs_negated_unicode_general_categories;
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HashTable<Unicode::Property> lhs_negated_unicode_properties;
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HashTable<Unicode::Script> lhs_negated_unicode_scripts;
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HashTable<Unicode::Script> lhs_negated_unicode_script_extensions;
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};
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static bool interpret_compares(Vector<CompareTypeAndValuePair> const& lhs, StaticallyInterpretedCompares& compares)
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{
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bool inverse { false };
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bool temporary_inverse { false };
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bool reset_temporary_inverse { false };
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auto current_lhs_inversion_state = [&]() -> bool { return temporary_inverse ^ inverse; };
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auto& lhs_ranges = compares.lhs_ranges;
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auto& lhs_negated_ranges = compares.lhs_negated_ranges;
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auto& lhs_char_classes = compares.lhs_char_classes;
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auto& lhs_negated_char_classes = compares.lhs_negated_char_classes;
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auto& has_any_unicode_property = compares.has_any_unicode_property;
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auto& lhs_unicode_general_categories = compares.lhs_unicode_general_categories;
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auto& lhs_unicode_properties = compares.lhs_unicode_properties;
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auto& lhs_unicode_scripts = compares.lhs_unicode_scripts;
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auto& lhs_unicode_script_extensions = compares.lhs_unicode_script_extensions;
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auto& lhs_negated_unicode_general_categories = compares.lhs_negated_unicode_general_categories;
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auto& lhs_negated_unicode_properties = compares.lhs_negated_unicode_properties;
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auto& lhs_negated_unicode_scripts = compares.lhs_negated_unicode_scripts;
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auto& lhs_negated_unicode_script_extensions = compares.lhs_negated_unicode_script_extensions;
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for (auto const& pair : lhs) {
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if (reset_temporary_inverse) {
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reset_temporary_inverse = false;
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temporary_inverse = false;
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} else {
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reset_temporary_inverse = true;
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}
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switch (pair.type) {
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case CharacterCompareType::Inverse:
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inverse = !inverse;
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break;
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case CharacterCompareType::TemporaryInverse:
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temporary_inverse = true;
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reset_temporary_inverse = false;
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break;
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case CharacterCompareType::AnyChar:
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// Special case: if not inverted, AnyChar is always in the range.
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if (!current_lhs_inversion_state())
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return false;
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break;
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case CharacterCompareType::Char:
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if (!current_lhs_inversion_state())
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lhs_ranges.insert(pair.value, pair.value);
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else
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lhs_negated_ranges.insert(pair.value, pair.value);
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break;
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case CharacterCompareType::String:
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// FIXME: We just need to look at the last character of this string, but we only have the first character here.
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// Just bail out to avoid false positives.
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return false;
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case CharacterCompareType::CharClass:
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if (!current_lhs_inversion_state())
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lhs_char_classes.set(static_cast<CharClass>(pair.value));
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else
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lhs_negated_char_classes.set(static_cast<CharClass>(pair.value));
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break;
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case CharacterCompareType::CharRange: {
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auto range = CharRange(pair.value);
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if (!current_lhs_inversion_state())
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lhs_ranges.insert(range.from, range.to);
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else
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lhs_negated_ranges.insert(range.from, range.to);
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break;
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}
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case CharacterCompareType::LookupTable:
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// We've transformed this into a series of ranges in flat_compares(), so bail out if we see it.
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return false;
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case CharacterCompareType::Reference:
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// We've handled this before coming here.
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break;
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case CharacterCompareType::Property:
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has_any_unicode_property = true;
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if (!current_lhs_inversion_state())
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lhs_unicode_properties.set(static_cast<Unicode::Property>(pair.value));
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else
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lhs_negated_unicode_properties.set(static_cast<Unicode::Property>(pair.value));
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break;
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case CharacterCompareType::GeneralCategory:
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has_any_unicode_property = true;
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if (!current_lhs_inversion_state())
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lhs_unicode_general_categories.set(static_cast<Unicode::GeneralCategory>(pair.value));
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else
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lhs_negated_unicode_general_categories.set(static_cast<Unicode::GeneralCategory>(pair.value));
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break;
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case CharacterCompareType::Script:
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has_any_unicode_property = true;
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if (!current_lhs_inversion_state())
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lhs_unicode_scripts.set(static_cast<Unicode::Script>(pair.value));
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else
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lhs_negated_unicode_scripts.set(static_cast<Unicode::Script>(pair.value));
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break;
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case CharacterCompareType::ScriptExtension:
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has_any_unicode_property = true;
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if (!current_lhs_inversion_state())
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lhs_unicode_script_extensions.set(static_cast<Unicode::Script>(pair.value));
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else
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lhs_negated_unicode_script_extensions.set(static_cast<Unicode::Script>(pair.value));
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break;
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case CharacterCompareType::Or:
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case CharacterCompareType::EndAndOr:
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// These are the default behaviour for [...], so we don't need to do anything (unless we add support for 'And' below).
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break;
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case CharacterCompareType::And:
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// FIXME: These are too difficult to handle, so bail out.
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return false;
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case CharacterCompareType::Undefined:
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case CharacterCompareType::RangeExpressionDummy:
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// These do not occur in valid bytecode.
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VERIFY_NOT_REACHED();
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}
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}
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return true;
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}
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template<class Parser>
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void Regex<Parser>::fill_optimization_data(BasicBlockList const& blocks)
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{
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if (blocks.is_empty())
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return;
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if constexpr (REGEX_DEBUG) {
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dbgln("Pulling out optimization data from bytecode:");
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RegexDebug dbg;
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dbg.print_bytecode(*this);
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for (auto const& block : blocks)
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dbgln("block from {} to {} (comment: {})", block.start, block.end, block.comment);
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}
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ScopeGuard print = [&] {
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if constexpr (REGEX_DEBUG) {
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dbgln("Optimization data:");
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if (parser_result.optimization_data.starting_ranges.is_empty())
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dbgln("; - no starting ranges");
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for (auto const& range : parser_result.optimization_data.starting_ranges)
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dbgln(" - starting range: {}-{}", range.from, range.to);
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dbgln("; - only start of line: {}", parser_result.optimization_data.only_start_of_line);
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}
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};
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auto& bytecode = parser_result.bytecode;
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auto state = MatchState::only_for_enumeration();
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auto block = blocks.first();
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for (state.instruction_position = block.start; state.instruction_position < block.end;) {
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auto& opcode = bytecode.get_opcode(state);
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switch (opcode.opcode_id()) {
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case OpCodeId::Compare: {
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auto flat_compares = static_cast<OpCode_Compare const&>(opcode).flat_compares();
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StaticallyInterpretedCompares compares;
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if (!interpret_compares(flat_compares, compares))
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return; // No idea, the bytecode is too complex.
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if (compares.has_any_unicode_property)
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return; // Faster to just run the bytecode.
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// FIXME: We should be able to handle these cases (jump ahead while...)
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if (!compares.lhs_char_classes.is_empty() || !compares.lhs_negated_char_classes.is_empty() || !compares.lhs_negated_ranges.is_empty())
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return;
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for (auto it = compares.lhs_ranges.begin(); it != compares.lhs_ranges.end(); ++it)
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parser_result.optimization_data.starting_ranges.append({ it.key(), *it });
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return;
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}
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case OpCodeId::CheckBegin:
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parser_result.optimization_data.only_start_of_line = true;
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return;
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case OpCodeId::Checkpoint:
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case OpCodeId::Save:
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case OpCodeId::ClearCaptureGroup:
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case OpCodeId::SaveLeftCaptureGroup:
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// These do not 'match' anything, so look through them.
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state.instruction_position += opcode.size();
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continue;
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default:
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return;
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}
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}
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}
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template<typename Parser>
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typename Regex<Parser>::BasicBlockList Regex<Parser>::split_basic_blocks(ByteCode const& bytecode)
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{
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@ -126,7 +322,6 @@ typename Regex<Parser>::BasicBlockList Regex<Parser>::split_basic_blocks(ByteCod
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static bool has_overlap(Vector<CompareTypeAndValuePair> const& lhs, Vector<CompareTypeAndValuePair> const& rhs)
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{
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// We have to fully interpret the two sequences to determine if they overlap (that is, keep track of inversion state and what ranges they cover).
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bool inverse { false };
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bool temporary_inverse { false };
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@ -134,20 +329,20 @@ static bool has_overlap(Vector<CompareTypeAndValuePair> const& lhs, Vector<Compa
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auto current_lhs_inversion_state = [&]() -> bool { return temporary_inverse ^ inverse; };
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RedBlackTree<u32, u32> lhs_ranges;
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RedBlackTree<u32, u32> lhs_negated_ranges;
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HashTable<CharClass> lhs_char_classes;
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HashTable<CharClass> lhs_negated_char_classes;
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auto has_any_unicode_property = false;
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HashTable<Unicode::GeneralCategory> lhs_unicode_general_categories;
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HashTable<Unicode::Property> lhs_unicode_properties;
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HashTable<Unicode::Script> lhs_unicode_scripts;
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HashTable<Unicode::Script> lhs_unicode_script_extensions;
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HashTable<Unicode::GeneralCategory> lhs_negated_unicode_general_categories;
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HashTable<Unicode::Property> lhs_negated_unicode_properties;
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HashTable<Unicode::Script> lhs_negated_unicode_scripts;
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HashTable<Unicode::Script> lhs_negated_unicode_script_extensions;
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StaticallyInterpretedCompares compares;
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auto& lhs_ranges = compares.lhs_ranges;
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auto& lhs_negated_ranges = compares.lhs_negated_ranges;
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auto& lhs_char_classes = compares.lhs_char_classes;
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auto& lhs_negated_char_classes = compares.lhs_negated_char_classes;
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auto& has_any_unicode_property = compares.has_any_unicode_property;
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auto& lhs_unicode_general_categories = compares.lhs_unicode_general_categories;
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auto& lhs_unicode_properties = compares.lhs_unicode_properties;
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auto& lhs_unicode_scripts = compares.lhs_unicode_scripts;
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auto& lhs_unicode_script_extensions = compares.lhs_unicode_script_extensions;
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auto& lhs_negated_unicode_general_categories = compares.lhs_negated_unicode_general_categories;
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auto& lhs_negated_unicode_properties = compares.lhs_negated_unicode_properties;
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auto& lhs_negated_unicode_scripts = compares.lhs_negated_unicode_scripts;
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auto& lhs_negated_unicode_script_extensions = compares.lhs_negated_unicode_script_extensions;
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auto any_unicode_property_matches = [&](u32 code_point) {
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if (any_of(lhs_negated_unicode_general_categories, [code_point](auto category) { return Unicode::code_point_has_general_category(code_point, category); }))
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@ -214,98 +409,8 @@ static bool has_overlap(Vector<CompareTypeAndValuePair> const& lhs, Vector<Compa
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return false;
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};
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for (auto const& pair : lhs) {
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if (reset_temporary_inverse) {
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reset_temporary_inverse = false;
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temporary_inverse = false;
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} else {
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reset_temporary_inverse = true;
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}
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switch (pair.type) {
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case CharacterCompareType::Inverse:
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inverse = !inverse;
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break;
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case CharacterCompareType::TemporaryInverse:
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temporary_inverse = true;
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reset_temporary_inverse = false;
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break;
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case CharacterCompareType::AnyChar:
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// Special case: if not inverted, AnyChar is always in the range.
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if (!current_lhs_inversion_state())
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return true;
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break;
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case CharacterCompareType::Char:
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if (!current_lhs_inversion_state())
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lhs_ranges.insert(pair.value, pair.value);
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else
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lhs_negated_ranges.insert(pair.value, pair.value);
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break;
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case CharacterCompareType::String:
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// FIXME: We just need to look at the last character of this string, but we only have the first character here.
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// Just bail out to avoid false positives.
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return true;
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case CharacterCompareType::CharClass:
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if (!current_lhs_inversion_state())
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lhs_char_classes.set(static_cast<CharClass>(pair.value));
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else
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lhs_negated_char_classes.set(static_cast<CharClass>(pair.value));
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break;
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case CharacterCompareType::CharRange: {
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auto range = CharRange(pair.value);
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||||
if (!current_lhs_inversion_state())
|
||||
lhs_ranges.insert(range.from, range.to);
|
||||
else
|
||||
lhs_negated_ranges.insert(range.from, range.to);
|
||||
break;
|
||||
}
|
||||
case CharacterCompareType::LookupTable:
|
||||
// We've transformed this into a series of ranges in flat_compares(), so bail out if we see it.
|
||||
return true;
|
||||
case CharacterCompareType::Reference:
|
||||
// We've handled this before coming here.
|
||||
break;
|
||||
case CharacterCompareType::Property:
|
||||
has_any_unicode_property = true;
|
||||
if (!current_lhs_inversion_state())
|
||||
lhs_unicode_properties.set(static_cast<Unicode::Property>(pair.value));
|
||||
else
|
||||
lhs_negated_unicode_properties.set(static_cast<Unicode::Property>(pair.value));
|
||||
break;
|
||||
case CharacterCompareType::GeneralCategory:
|
||||
has_any_unicode_property = true;
|
||||
if (!current_lhs_inversion_state())
|
||||
lhs_unicode_general_categories.set(static_cast<Unicode::GeneralCategory>(pair.value));
|
||||
else
|
||||
lhs_negated_unicode_general_categories.set(static_cast<Unicode::GeneralCategory>(pair.value));
|
||||
break;
|
||||
case CharacterCompareType::Script:
|
||||
has_any_unicode_property = true;
|
||||
if (!current_lhs_inversion_state())
|
||||
lhs_unicode_scripts.set(static_cast<Unicode::Script>(pair.value));
|
||||
else
|
||||
lhs_negated_unicode_scripts.set(static_cast<Unicode::Script>(pair.value));
|
||||
break;
|
||||
case CharacterCompareType::ScriptExtension:
|
||||
has_any_unicode_property = true;
|
||||
if (!current_lhs_inversion_state())
|
||||
lhs_unicode_script_extensions.set(static_cast<Unicode::Script>(pair.value));
|
||||
else
|
||||
lhs_negated_unicode_script_extensions.set(static_cast<Unicode::Script>(pair.value));
|
||||
break;
|
||||
case CharacterCompareType::Or:
|
||||
case CharacterCompareType::EndAndOr:
|
||||
// These are the default behaviour for [...], so we don't need to do anything (unless we add support for 'And' below).
|
||||
break;
|
||||
case CharacterCompareType::And:
|
||||
// FIXME: These are too difficult to handle, so bail out.
|
||||
return true;
|
||||
case CharacterCompareType::Undefined:
|
||||
case CharacterCompareType::RangeExpressionDummy:
|
||||
// These do not occur in valid bytecode.
|
||||
VERIFY_NOT_REACHED();
|
||||
}
|
||||
}
|
||||
if (!interpret_compares(lhs, compares))
|
||||
return true; // We can't interpret this, so we can't optimize it.
|
||||
|
||||
if constexpr (REGEX_DEBUG) {
|
||||
dbgln("lhs ranges:");
|
||||
|
|
|
|||
|
|
@ -64,6 +64,8 @@ public:
|
|||
|
||||
struct {
|
||||
Optional<ByteString> pure_substring_search;
|
||||
// If populated, the pattern only accepts strings that start with a character in these ranges.
|
||||
Vector<CharRange> starting_ranges;
|
||||
bool only_start_of_line = false;
|
||||
} optimization_data {};
|
||||
};
|
||||
|
|
|
|||
Loading…
Add table
Reference in a new issue