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LibJS: Reduce copying of string data in RegExp.prototype

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In addition to invoking js_string() with existing UTF-16 strings when
possible, RegExpExec now takes a Utf16String instead of a Utf16View. The
view was previously fully copied into the returned result object, so
this prevents potentially large copies of string data.
This commit is contained in:
Timothy Flynn 2021-08-09 12:55:08 -04:00 committed by Andreas Kling
parent 6c45620709
commit 34bd25f6c2
Notes: sideshowbarker 2024-07-18 07:08:19 +09:00 
Author: https://github.com/trflynn89
Commit: https://github.com/SerenityOS/serenity/commit/34bd25f6c28
Pull-request: https://github.com/SerenityOS/serenity/pull/9320
Reviewed-by: https://github.com/davidot ✅
4 changed files with 39 additions and 49 deletions
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81
Userland/Libraries/LibJS/Runtime/RegExpPrototype.cpp
View File

@ -18,7 +18,6 @@
#include <LibJS/Runtime/RegExpPrototype.h>
#include <LibJS/Runtime/RegExpStringIterator.h>
#include <LibJS/Runtime/StringPrototype.h>
#include <LibJS/Runtime/Utf16String.h>
#include <LibJS/Token.h>
namespace JS {
@ -194,7 +193,7 @@ static Value make_indices_array(GlobalObject& global_object, Utf16View const& st
}
// 22.2.5.2.2 RegExpBuiltinExec ( R, S ), https://tc39.es/ecma262/#sec-regexpbuiltinexec
static Value regexp_builtin_exec(GlobalObject& global_object, RegExpObject& regexp_object, Utf16View const& string)
static Value regexp_builtin_exec(GlobalObject& global_object, RegExpObject& regexp_object, Utf16String string)
{
// FIXME: This should try using internal slots [[RegExpMatcher]], [[OriginalFlags]], etc.
auto& vm = global_object.vm();
@ -215,6 +214,7 @@ static Value regexp_builtin_exec(GlobalObject& global_object, RegExpObject& rege
if (!global && !sticky)
last_index = 0;
auto string_view = string.view();
RegexResult result;
while (true) {
@ -228,8 +228,8 @@ static Value regexp_builtin_exec(GlobalObject& global_object, RegExpObject& rege
return js_null();
}
regex.start_offset = unicode ? string.code_point_offset_of(last_index) : last_index;
result = regex.match(string);
regex.start_offset = unicode ? string_view.code_point_offset_of(last_index) : last_index;
result = regex.match(string_view);
if (result.success)
break;
@ -242,7 +242,7 @@ static Value regexp_builtin_exec(GlobalObject& global_object, RegExpObject& rege
return js_null();
}
last_index = advance_string_index(string, last_index, unicode);
last_index = advance_string_index(string_view, last_index, unicode);
}
auto& match = result.matches[0];
@ -253,8 +253,8 @@ static Value regexp_builtin_exec(GlobalObject& global_object, RegExpObject& rege
auto end_index = match_index + match.view.length();
if (unicode) {
match_index = string.code_unit_offset_of(match.global_offset);
end_index = string.code_unit_offset_of(end_index);
match_index = string_view.code_unit_offset_of(match.global_offset);
end_index = string_view.code_unit_offset_of(end_index);
}
if (global || sticky) {
@ -267,10 +267,6 @@ static Value regexp_builtin_exec(GlobalObject& global_object, RegExpObject& rege
if (vm.exception())
return {};
array->create_data_property_or_throw(vm.names.index, Value(match_index));
array->create_data_property_or_throw(vm.names.input, js_string(vm, string));
array->create_data_property_or_throw(0, js_string(vm, match.view.u16_view()));
Vector<Optional<Match>> indices { Match::create(match) };
HashMap<String, Match> group_names;
@ -303,17 +299,21 @@ static Value regexp_builtin_exec(GlobalObject& global_object, RegExpObject& rege
array->create_data_property_or_throw(vm.names.groups, groups);
if (has_indices) {
auto indices_array = make_indices_array(global_object, string, indices, group_names, has_groups);
auto indices_array = make_indices_array(global_object, string_view, indices, group_names, has_groups);
array->create_data_property(vm.names.indices, indices_array);
if (vm.exception())
return {};
}
array->create_data_property_or_throw(vm.names.index, Value(match_index));
array->create_data_property_or_throw(vm.names.input, js_string(vm, move(string)));
array->create_data_property_or_throw(0, js_string(vm, match.view.u16_view()));
return array;
}
// 22.2.5.2.1 RegExpExec ( R, S ), https://tc39.es/ecma262/#sec-regexpexec
Value regexp_exec(GlobalObject& global_object, Object& regexp_object, Utf16View const& string)
Value regexp_exec(GlobalObject& global_object, Object& regexp_object, Utf16String string)
{
auto& vm = global_object.vm();
@ -322,7 +322,7 @@ Value regexp_exec(GlobalObject& global_object, Object& regexp_object, Utf16View
return {};
if (exec.is_function()) {
auto result = vm.call(exec.as_function(), &regexp_object, js_string(vm, string));
auto result = vm.call(exec.as_function(), &regexp_object, js_string(vm, move(string)));
if (vm.exception())
return {};
@ -337,7 +337,7 @@ Value regexp_exec(GlobalObject& global_object, Object& regexp_object, Utf16View
return {};
}
return regexp_builtin_exec(global_object, static_cast<RegExpObject&>(regexp_object), string);
return regexp_builtin_exec(global_object, static_cast<RegExpObject&>(regexp_object), move(string));
}
// 1.1.4.3 get RegExp.prototype.hasIndices, https://tc39.es/proposal-regexp-match-indices/#sec-get-regexp.prototype.hasIndices
@ -415,9 +415,8 @@ JS_DEFINE_NATIVE_FUNCTION(RegExpPrototype::exec)
auto string = vm.argument(0).to_utf16_string(global_object);
if (vm.exception())
return {};
auto string_view = string.view();
return regexp_builtin_exec(global_object, *regexp_object, string_view);
return regexp_builtin_exec(global_object, *regexp_object, move(string));
}
// 22.2.5.15 RegExp.prototype.test ( S ), https://tc39.es/ecma262/#sec-regexp.prototype.test
@ -430,9 +429,8 @@ JS_DEFINE_NATIVE_FUNCTION(RegExpPrototype::test)
auto string = vm.argument(0).to_utf16_string(global_object);
if (vm.exception())
return {};
auto string_view = string.view();
auto match = regexp_exec(global_object, *regexp_object, string_view);
auto match = regexp_exec(global_object, *regexp_object, move(string));
if (vm.exception())
return {};
@ -473,7 +471,6 @@ JS_DEFINE_NATIVE_FUNCTION(RegExpPrototype::symbol_match)
auto string = vm.argument(0).to_utf16_string(global_object);
if (vm.exception())
return {};
auto string_view = string.view();
auto global_value = regexp_object->get(vm.names.global);
if (vm.exception())
@ -481,7 +478,7 @@ JS_DEFINE_NATIVE_FUNCTION(RegExpPrototype::symbol_match)
bool global = global_value.to_boolean();
if (!global) {
auto result = regexp_exec(global_object, *regexp_object, string_view);
auto result = regexp_exec(global_object, *regexp_object, move(string));
if (vm.exception())
return {};
return result;
@ -503,7 +500,7 @@ JS_DEFINE_NATIVE_FUNCTION(RegExpPrototype::symbol_match)
size_t n = 0;
while (true) {
auto result = regexp_exec(global_object, *regexp_object, string_view);
auto result = regexp_exec(global_object, *regexp_object, string);
if (vm.exception())
return {};
@ -528,7 +525,7 @@ JS_DEFINE_NATIVE_FUNCTION(RegExpPrototype::symbol_match)
return {};
if (match_str.is_empty()) {
increment_last_index(global_object, *regexp_object, string_view, unicode);
increment_last_index(global_object, *regexp_object, string.view(), unicode);
if (vm.exception())
return {};
}
@ -631,7 +628,7 @@ JS_DEFINE_NATIVE_FUNCTION(RegExpPrototype::symbol_replace)
MarkedValueList results(vm.heap());
while (true) {
auto result = regexp_exec(global_object, *regexp_object, string_view);
auto result = regexp_exec(global_object, *regexp_object, string);
if (vm.exception())
return {};
if (result.is_null())
@ -659,7 +656,7 @@ JS_DEFINE_NATIVE_FUNCTION(RegExpPrototype::symbol_replace)
}
}
String accumulated_result;
StringBuilder accumulated_result;
size_t next_source_position = 0;
for (auto& result_value : results) {
@ -683,7 +680,7 @@ JS_DEFINE_NATIVE_FUNCTION(RegExpPrototype::symbol_replace)
if (vm.exception())
return {};
position = clamp(position, static_cast<double>(0), static_cast<double>(string_view.length_in_code_units()));
position = clamp(position, static_cast<double>(0), static_cast<double>(string.length_in_code_units()));
MarkedValueList captures(vm.heap());
for (size_t n = 1; n <= n_captures; ++n) {
@ -715,7 +712,7 @@ JS_DEFINE_NATIVE_FUNCTION(RegExpPrototype::symbol_replace)
replacer_args.append(js_string(vm, move(matched)));
replacer_args.extend(move(captures));
replacer_args.append(Value(position));
replacer_args.append(js_string(vm, string_view));
replacer_args.append(js_string(vm, string));
if (!named_captures.is_undefined()) {
replacer_args.append(move(named_captures));
}
@ -742,27 +739,20 @@ JS_DEFINE_NATIVE_FUNCTION(RegExpPrototype::symbol_replace)
if (position >= next_source_position) {
auto substring = string_view.substring_view(next_source_position, position - next_source_position);
accumulated_result.append(substring);
accumulated_result.append(replacement);
StringBuilder builder;
builder.append(accumulated_result);
builder.append(substring.to_utf8(Utf16View::AllowInvalidCodeUnits::Yes));
builder.append(replacement);
accumulated_result = builder.build();
next_source_position = position + matched_length;
}
}
if (next_source_position >= string_view.length_in_code_units())
return js_string(vm, accumulated_result);
if (next_source_position >= string.length_in_code_units())
return js_string(vm, accumulated_result.build());
auto substring = string_view.substring_view(next_source_position);
accumulated_result.append(substring);
StringBuilder builder;
builder.append(accumulated_result);
builder.append(substring.to_utf8(Utf16View::AllowInvalidCodeUnits::Yes));
return js_string(vm, builder.build());
return js_string(vm, accumulated_result.build());
}
// 22.2.5.11 RegExp.prototype [ @@search ] ( string ), https://tc39.es/ecma262/#sec-regexp.prototype-@@search
@ -775,7 +765,6 @@ JS_DEFINE_NATIVE_FUNCTION(RegExpPrototype::symbol_search)
auto string = vm.argument(0).to_utf16_string(global_object);
if (vm.exception())
return {};
auto string_view = string.view();
auto previous_last_index = regexp_object->get(vm.names.lastIndex);
if (vm.exception())
@ -786,7 +775,7 @@ JS_DEFINE_NATIVE_FUNCTION(RegExpPrototype::symbol_search)
return {};
}
auto result = regexp_exec(global_object, *regexp_object, string_view);
auto result = regexp_exec(global_object, *regexp_object, move(string));
if (vm.exception())
return {};
@ -862,12 +851,12 @@ JS_DEFINE_NATIVE_FUNCTION(RegExpPrototype::symbol_split)
if (limit == 0)
return array;
if (string_view.is_empty()) {
auto result = regexp_exec(global_object, *splitter, string_view);
if (string.is_empty()) {
auto result = regexp_exec(global_object, *splitter, string);
if (!result.is_null())
return array;
array->create_data_property_or_throw(0, js_string(vm, string_view));
array->create_data_property_or_throw(0, js_string(vm, move(string)));
return array;
}
@ -879,7 +868,7 @@ JS_DEFINE_NATIVE_FUNCTION(RegExpPrototype::symbol_split)
if (vm.exception())
return {};
auto result = regexp_exec(global_object, *splitter, string_view);
auto result = regexp_exec(global_object, *splitter, string);
if (vm.exception())
return {};
if (result.is_null()) {

3
Userland/Libraries/LibJS/Runtime/RegExpPrototype.h
View File

@ -7,10 +7,11 @@
#pragma once
#include <LibJS/Runtime/RegExpObject.h>
#include <LibJS/Runtime/Utf16String.h>
namespace JS {
Value regexp_exec(GlobalObject& global_object, Object& regexp_object, Utf16View const& string);
Value regexp_exec(GlobalObject& global_object, Object& regexp_object, Utf16String string);
size_t advance_string_index(Utf16View const& string, size_t index, bool unicode);
class RegExpPrototype final : public Object {

2
Userland/Libraries/LibJS/Runtime/RegExpStringIterator.h
View File

@ -22,7 +22,7 @@ public:
virtual ~RegExpStringIterator() override = default;
Object& regexp_object() { return m_regexp_object; }
Utf16View string() const { return m_string.view(); }
Utf16String string() const { return m_string; }
bool global() const { return m_global; }
bool unicode() const { return m_unicode; }

2
Userland/Libraries/LibJS/Runtime/RegExpStringIteratorPrototype.cpp
View File

@ -76,7 +76,7 @@ JS_DEFINE_NATIVE_FUNCTION(RegExpStringIteratorPrototype::next)
if (vm.exception())
return {};
last_index = advance_string_index(iterator.string(), last_index, iterator.unicode());
last_index = advance_string_index(iterator.string().view(), last_index, iterator.unicode());
iterator.regexp_object().set(vm.names.lastIndex, Value(last_index), Object::ShouldThrowExceptions::Yes);
if (vm.exception())