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https://github.com/RGBCube/serenity
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LibJS: Reduce copying of string data in String.prototype
The primary themes here are invoking js_string() with existing instances of Utf16String when possible, and not creating entire UTF-8 copies when not needed.
This commit is contained in:
Timothy Flynn
Andreas Kling
parent
daf559c717
commit
6c45620709
2 changed files with 75 additions and 120 deletions
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@ -595,17 +595,17 @@ String get_substitution(GlobalObject& global_object, Utf16View const& matched, U
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result.append('$');
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++i;
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} else if (next == '&') {
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result.append(matched.to_utf8(Utf16View::AllowInvalidCodeUnits::Yes));
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result.append(matched);
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++i;
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} else if (next == '`') {
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auto substring = str.substring_view(0, position);
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result.append(substring.to_utf8(Utf16View::AllowInvalidCodeUnits::Yes));
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result.append(substring);
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++i;
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} else if (next == '\'') {
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auto tail_pos = position + matched.length_in_code_units();
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if (tail_pos < str.length_in_code_units()) {
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auto substring = str.substring_view(tail_pos);
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result.append(substring.to_utf8(Utf16View::AllowInvalidCodeUnits::Yes));
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result.append(substring);
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}
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++i;
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} else if (is_ascii_digit(next)) {
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@ -187,11 +187,10 @@ JS_DEFINE_NATIVE_FUNCTION(StringPrototype::char_at)
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if (vm.exception())
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return {};
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auto utf16_string_view = string.view();
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if (position < 0 || position >= utf16_string_view.length_in_code_units())
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if (position < 0 || position >= string.length_in_code_units())
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return js_string(vm, String::empty());
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return js_string(vm, utf16_string_view.substring_view(position, 1));
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return js_string(vm, string.substring_view(position, 1));
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}
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// 22.1.3.2 String.prototype.charCodeAt ( pos ), https://tc39.es/ecma262/#sec-string.prototype.charcodeat
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@ -204,11 +203,10 @@ JS_DEFINE_NATIVE_FUNCTION(StringPrototype::char_code_at)
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if (vm.exception())
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return {};
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auto utf16_string_view = string.view();
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if (position < 0 || position >= utf16_string_view.length_in_code_units())
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if (position < 0 || position >= string.length_in_code_units())
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return js_nan();
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return Value(utf16_string_view.code_unit_at(position));
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return Value(string.code_unit_at(position));
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}
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// 22.1.3.3 String.prototype.codePointAt ( pos ), https://tc39.es/ecma262/#sec-string.prototype.codepointat
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@ -221,11 +219,10 @@ JS_DEFINE_NATIVE_FUNCTION(StringPrototype::code_point_at)
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if (vm.exception())
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return {};
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auto utf16_string_view = string.view();
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if (position < 0 || position >= utf16_string_view.length_in_code_units())
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if (position < 0 || position >= string.length_in_code_units())
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return js_undefined();
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auto code_point = JS::code_point_at(utf16_string_view, position);
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auto code_point = JS::code_point_at(string.view(), position);
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return Value(code_point.code_point);
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}
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@ -284,11 +281,8 @@ JS_DEFINE_NATIVE_FUNCTION(StringPrototype::starts_with)
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if (vm.exception())
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return {};
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auto utf16_string_view = string.view();
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auto string_length = utf16_string_view.length_in_code_units();
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auto utf16_search_view = search_string.view();
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auto search_length = utf16_search_view.length_in_code_units();
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auto string_length = string.length_in_code_units();
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auto search_length = search_string.length_in_code_units();
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size_t start = 0;
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if (!vm.argument(1).is_undefined()) {
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@ -305,8 +299,8 @@ JS_DEFINE_NATIVE_FUNCTION(StringPrototype::starts_with)
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if (end > string_length)
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return Value(false);
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utf16_string_view = utf16_string_view.substring_view(start, end - start);
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return Value(utf16_string_view == utf16_search_view);
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auto substring_view = string.substring_view(start, end - start);
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return Value(substring_view == search_string.view());
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}
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// 22.1.3.6 String.prototype.endsWith ( searchString [ , endPosition ] ), https://tc39.es/ecma262/#sec-string.prototype.endswith
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@ -330,11 +324,8 @@ JS_DEFINE_NATIVE_FUNCTION(StringPrototype::ends_with)
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if (vm.exception())
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return {};
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auto utf16_string_view = string.view();
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auto string_length = utf16_string_view.length_in_code_units();
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auto utf16_search_view = search_string.view();
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auto search_length = utf16_search_view.length_in_code_units();
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auto string_length = string.length_in_code_units();
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auto search_length = search_string.length_in_code_units();
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size_t end = string_length;
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if (!vm.argument(1).is_undefined()) {
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@ -351,8 +342,8 @@ JS_DEFINE_NATIVE_FUNCTION(StringPrototype::ends_with)
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size_t start = end - search_length;
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utf16_string_view = utf16_string_view.substring_view(start, end - start);
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return Value(utf16_string_view == utf16_search_view);
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auto substring_view = string.substring_view(start, end - start);
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return Value(substring_view == search_string.view());
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}
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// 22.1.3.8 String.prototype.indexOf ( searchString [ , position ] ), https://tc39.es/ecma262/#sec-string.prototype.indexof
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@ -445,64 +436,58 @@ enum class PadPlacement {
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};
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// 22.1.3.15.1 StringPad ( O, maxLength, fillString, placement ), https://tc39.es/ecma262/#sec-stringpad
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static Value pad_string(GlobalObject& global_object, String const& string, PadPlacement placement)
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static Value pad_string(GlobalObject& global_object, Utf16String string, PadPlacement placement)
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{
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auto& vm = global_object.vm();
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Utf16String utf16_string(string);
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auto string_length = utf16_string.length_in_code_units();
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auto string_length = string.length_in_code_units();
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auto max_length = vm.argument(0).to_length(global_object);
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if (vm.exception())
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return {};
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if (max_length <= string_length)
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return js_string(vm, move(utf16_string));
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return js_string(vm, move(string));
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String fill_string = " ";
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Utf16String fill_string(Vector<u16> { 0x20 });
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if (!vm.argument(1).is_undefined()) {
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fill_string = vm.argument(1).to_string(global_object);
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fill_string = vm.argument(1).to_utf16_string(global_object);
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if (vm.exception())
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return {};
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if (fill_string.is_empty())
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return js_string(vm, move(utf16_string));
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return js_string(vm, move(string));
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}
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Utf16String utf16_fill_string(fill_string);
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auto utf16_fill_view = utf16_fill_string.view();
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auto fill_code_units = utf16_fill_view.length_in_code_units();
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auto fill_code_units = fill_string.length_in_code_units();
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auto fill_length = max_length - string_length;
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StringBuilder filler_builder;
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for (size_t i = 0; i < fill_length / fill_code_units; ++i)
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filler_builder.append(fill_string);
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utf16_fill_view = utf16_fill_view.substring_view(0, fill_length % fill_code_units);
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filler_builder.append(utf16_fill_view.to_utf8(Utf16View::AllowInvalidCodeUnits::Yes));
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filler_builder.append(fill_string.view());
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filler_builder.append(fill_string.substring_view(0, fill_length % fill_code_units));
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auto filler = filler_builder.build();
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auto formatted = placement == PadPlacement::Start
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? String::formatted("{}{}", filler, string)
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: String::formatted("{}{}", string, filler);
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return js_string(vm, formatted);
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? String::formatted("{}{}", filler, string.view())
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: String::formatted("{}{}", string.view(), filler);
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return js_string(vm, move(formatted));
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}
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// 22.1.3.15 String.prototype.padStart ( maxLength [ , fillString ] ), https://tc39.es/ecma262/#sec-string.prototype.padstart
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JS_DEFINE_NATIVE_FUNCTION(StringPrototype::pad_start)
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{
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auto string = ak_string_from(vm, global_object);
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if (!string.has_value())
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auto string = utf16_string_from(vm, global_object);
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if (vm.exception())
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return {};
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return pad_string(global_object, *string, PadPlacement::Start);
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return pad_string(global_object, move(string), PadPlacement::Start);
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}
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// 22.1.3.14 String.prototype.padEnd ( maxLength [ , fillString ] ), https://tc39.es/ecma262/#sec-string.prototype.padend
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JS_DEFINE_NATIVE_FUNCTION(StringPrototype::pad_end)
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{
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auto string = ak_string_from(vm, global_object);
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if (!string.has_value())
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auto string = utf16_string_from(vm, global_object);
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if (vm.exception())
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return {};
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return pad_string(global_object, *string, PadPlacement::End);
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return pad_string(global_object, move(string), PadPlacement::End);
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}
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static const Utf8View whitespace_characters = Utf8View("\x09\x0A\x0B\x0C\x0D\x20\xC2\xA0\xE1\x9A\x80\xE2\x80\x80\xE2\x80\x81\xE2\x80\x82\xE2\x80\x83\xE2\x80\x84\xE2\x80\x85\xE2\x80\x86\xE2\x80\x87\xE2\x80\x88\xE2\x80\x89\xE2\x80\x8A\xE2\x80\xAF\xE2\x81\x9F\xE3\x80\x80\xE2\x80\xA8\xE2\x80\xA9\xEF\xBB\xBF");
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@ -557,9 +542,7 @@ JS_DEFINE_NATIVE_FUNCTION(StringPrototype::substring)
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auto string = utf16_string_from(vm, global_object);
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if (vm.exception())
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return {};
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auto utf16_string_view = string.view();
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auto string_length = static_cast<double>(utf16_string_view.length_in_code_units());
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auto string_length = static_cast<double>(string.length_in_code_units());
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auto start = vm.argument(0).to_integer_or_infinity(global_object);
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if (vm.exception())
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@ -578,7 +561,7 @@ JS_DEFINE_NATIVE_FUNCTION(StringPrototype::substring)
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size_t from = min(final_start, final_end);
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size_t to = max(final_start, final_end);
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return js_string(vm, utf16_string_view.substring_view(from, to - from));
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return js_string(vm, string.substring_view(from, to - from));
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}
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// B.2.3.1 String.prototype.substr ( start, length ), https://tc39.es/ecma262/#sec-string.prototype.substr
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@ -587,9 +570,7 @@ JS_DEFINE_NATIVE_FUNCTION(StringPrototype::substr)
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auto string = utf16_string_from(vm, global_object);
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if (vm.exception())
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return {};
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auto utf16_string_view = string.view();
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auto size = utf16_string_view.length_in_code_units();
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auto size = string.length_in_code_units();
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auto int_start = vm.argument(0).to_integer_or_infinity(global_object);
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if (vm.exception())
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@ -613,7 +594,7 @@ JS_DEFINE_NATIVE_FUNCTION(StringPrototype::substr)
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if (int_start >= int_end)
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return js_string(vm, String::empty());
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return js_string(vm, utf16_string_view.substring_view(int_start, int_end - int_start));
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return js_string(vm, string.substring_view(int_start, int_end - int_start));
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}
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// 22.1.3.7 String.prototype.includes ( searchString [ , position ] ), https://tc39.es/ecma262/#sec-string.prototype.includes
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@ -637,18 +618,15 @@ JS_DEFINE_NATIVE_FUNCTION(StringPrototype::includes)
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if (vm.exception())
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return {};
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auto utf16_string_view = string.view();
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auto utf16_search_view = search_string.view();
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size_t start = 0;
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if (!vm.argument(1).is_undefined()) {
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auto position = vm.argument(1).to_integer_or_infinity(global_object);
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if (vm.exception())
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return {};
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start = clamp(position, static_cast<double>(0), static_cast<double>(utf16_string_view.length_in_code_units()));
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start = clamp(position, static_cast<double>(0), static_cast<double>(string.length_in_code_units()));
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}
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auto index = string_index_of(utf16_string_view, utf16_search_view, start);
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auto index = string_index_of(string.view(), search_string.view(), start);
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return Value(index.has_value());
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}
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@ -658,9 +636,7 @@ JS_DEFINE_NATIVE_FUNCTION(StringPrototype::slice)
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auto string = utf16_string_from(vm, global_object);
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if (vm.exception())
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return {};
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auto utf16_string_view = string.view();
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auto string_length = static_cast<double>(utf16_string_view.length_in_code_units());
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auto string_length = static_cast<double>(string.length_in_code_units());
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auto int_start = vm.argument(0).to_integer_or_infinity(global_object);
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if (vm.exception())
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@ -688,7 +664,7 @@ JS_DEFINE_NATIVE_FUNCTION(StringPrototype::slice)
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if (int_start >= int_end)
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return js_string(vm, String::empty());
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return js_string(vm, utf16_string_view.substring_view(int_start, int_end - int_start));
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return js_string(vm, string.substring_view(int_start, int_end - int_start));
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}
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// 22.1.3.21 String.prototype.split ( separator, limit ), https://tc39.es/ecma262/#sec-string.prototype.split
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@ -730,33 +706,30 @@ JS_DEFINE_NATIVE_FUNCTION(StringPrototype::split)
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if (limit == 0)
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return array;
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auto utf16_string_view = string.view();
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auto string_length = utf16_string_view.length_in_code_units();
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auto utf16_separator_view = separator.view();
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auto separator_length = utf16_separator_view.length_in_code_units();
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auto string_length = string.length_in_code_units();
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auto separator_length = separator.length_in_code_units();
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if (separator_argument.is_undefined()) {
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array->create_data_property_or_throw(0, js_string(vm, utf16_string_view));
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array->create_data_property_or_throw(0, js_string(vm, move(string)));
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return array;
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}
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if (string_length == 0) {
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if (separator_length > 0)
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array->create_data_property_or_throw(0, js_string(vm, utf16_string_view));
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array->create_data_property_or_throw(0, js_string(vm, move(string)));
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return array;
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}
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size_t start = 0; // 'p' in the spec.
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auto position = start; // 'q' in the spec.
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while (position != string_length) {
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auto match = split_match(utf16_string_view, position, utf16_separator_view); // 'e' in the spec.
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auto match = split_match(string.view(), position, separator.view()); // 'e' in the spec.
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if (!match.has_value() || match.value() == start) {
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++position;
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continue;
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}
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auto segment = utf16_string_view.substring_view(start, position - start);
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auto segment = string.substring_view(start, position - start);
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array->create_data_property_or_throw(array_length, js_string(vm, segment));
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++array_length;
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if (array_length == limit)
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@ -765,7 +738,7 @@ JS_DEFINE_NATIVE_FUNCTION(StringPrototype::split)
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position = start;
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}
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auto rest = utf16_string_view.substring_view(start);
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auto rest = string.substring_view(start);
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array->create_data_property_or_throw(array_length, js_string(vm, rest));
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return array;
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@ -782,11 +755,8 @@ JS_DEFINE_NATIVE_FUNCTION(StringPrototype::last_index_of)
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if (vm.exception())
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return {};
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auto utf16_string_view = string.view();
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auto string_length = utf16_string_view.length_in_code_units();
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auto utf16_search_view = search_string.view();
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auto search_length = utf16_search_view.length_in_code_units();
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auto string_length = string.length_in_code_units();
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auto search_length = search_string.length_in_code_units();
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auto position = vm.argument(1).to_number(global_object);
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if (vm.exception())
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@ -802,7 +772,7 @@ JS_DEFINE_NATIVE_FUNCTION(StringPrototype::last_index_of)
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bool is_match = true;
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for (size_t j = 0; j < search_length; ++j) {
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if (utf16_string_view.code_unit_at(k + j) != utf16_search_view.code_unit_at(j)) {
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if (string.code_unit_at(k + j) != search_string.code_unit_at(j)) {
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is_match = false;
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break;
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}
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@ -821,9 +791,7 @@ JS_DEFINE_NATIVE_FUNCTION(StringPrototype::at)
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auto string = utf16_string_from(vm, global_object);
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if (vm.exception())
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return {};
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auto utf16_string_view = string.view();
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auto length = utf16_string_view.length_in_code_units();
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auto length = string.length_in_code_units();
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auto relative_index = vm.argument(0).to_integer_or_infinity(global_object);
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if (vm.exception())
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@ -841,7 +809,7 @@ JS_DEFINE_NATIVE_FUNCTION(StringPrototype::at)
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if (index.has_overflow() || index.value() >= length)
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return js_undefined();
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return js_string(vm, utf16_string_view.substring_view(index.value(), 1));
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return js_string(vm, string.substring_view(index.value(), 1));
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}
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// 22.1.3.33 String.prototype [ @@iterator ] ( ), https://tc39.es/ecma262/#sec-string.prototype-@@iterator
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@ -873,12 +841,11 @@ JS_DEFINE_NATIVE_FUNCTION(StringPrototype::match)
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auto string = this_object.to_utf16_string(global_object);
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if (vm.exception())
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return {};
|
||||
auto utf16_string_view = string.view();
|
||||
|
||||
auto rx = regexp_create(global_object, regexp, js_undefined());
|
||||
if (!rx)
|
||||
return {};
|
||||
return Value(rx).invoke(global_object, *vm.well_known_symbol_match(), js_string(vm, utf16_string_view));
|
||||
return Value(rx).invoke(global_object, *vm.well_known_symbol_match(), js_string(vm, move(string)));
|
||||
}
|
||||
|
||||
// 22.1.3.12 String.prototype.matchAll ( regexp ), https://tc39.es/ecma262/#sec-string.prototype.matchall
|
||||
|
|
@ -916,12 +883,11 @@ JS_DEFINE_NATIVE_FUNCTION(StringPrototype::match_all)
|
|||
auto string = this_object.to_utf16_string(global_object);
|
||||
if (vm.exception())
|
||||
return {};
|
||||
auto utf16_string_view = string.view();
|
||||
|
||||
auto rx = regexp_create(global_object, regexp, js_string(vm, "g"));
|
||||
if (!rx)
|
||||
return {};
|
||||
return Value(rx).invoke(global_object, *vm.well_known_symbol_match_all(), js_string(vm, utf16_string_view));
|
||||
return Value(rx).invoke(global_object, *vm.well_known_symbol_match_all(), js_string(vm, move(string)));
|
||||
}
|
||||
|
||||
// 22.1.3.17 String.prototype.replace ( searchValue, replaceValue ), https://tc39.es/ecma262/#sec-string.prototype.replace
|
||||
|
|
@ -956,18 +922,15 @@ JS_DEFINE_NATIVE_FUNCTION(StringPrototype::replace)
|
|||
return {};
|
||||
}
|
||||
|
||||
auto utf16_string_view = string.view();
|
||||
auto utf16_search_view = search_string.view();
|
||||
|
||||
Optional<size_t> position = string_index_of(utf16_string_view, utf16_search_view, 0);
|
||||
Optional<size_t> position = string_index_of(string.view(), search_string.view(), 0);
|
||||
if (!position.has_value())
|
||||
return js_string(vm, utf16_string_view);
|
||||
return js_string(vm, move(string));
|
||||
|
||||
auto preserved = utf16_string_view.substring_view(0, position.value());
|
||||
auto preserved = string.substring_view(0, position.value());
|
||||
String replacement;
|
||||
|
||||
if (replace_value.is_function()) {
|
||||
auto result = vm.call(replace_value.as_function(), js_undefined(), js_string(vm, utf16_search_view), Value(position.value()), js_string(vm, utf16_string_view));
|
||||
auto result = vm.call(replace_value.as_function(), js_undefined(), js_string(vm, search_string), Value(position.value()), js_string(vm, string));
|
||||
if (vm.exception())
|
||||
return {};
|
||||
|
||||
|
|
@ -975,17 +938,15 @@ JS_DEFINE_NATIVE_FUNCTION(StringPrototype::replace)
|
|||
if (vm.exception())
|
||||
return {};
|
||||
} else {
|
||||
replacement = get_substitution(global_object, utf16_search_view, utf16_string_view, *position, {}, js_undefined(), replace_value);
|
||||
replacement = get_substitution(global_object, search_string.view(), string.view(), *position, {}, js_undefined(), replace_value);
|
||||
if (vm.exception())
|
||||
return {};
|
||||
}
|
||||
|
||||
utf16_string_view = utf16_string_view.substring_view(*position + utf16_search_view.length_in_code_units());
|
||||
|
||||
StringBuilder builder;
|
||||
builder.append(preserved.to_utf8(Utf16View::AllowInvalidCodeUnits::Yes));
|
||||
builder.append(preserved);
|
||||
builder.append(replacement);
|
||||
builder.append(utf16_string_view.to_utf8(Utf16View::AllowInvalidCodeUnits::Yes));
|
||||
builder.append(string.substring_view(*position + search_string.length_in_code_units()));
|
||||
|
||||
return js_string(vm, builder.build());
|
||||
}
|
||||
|
|
@ -1047,30 +1008,27 @@ JS_DEFINE_NATIVE_FUNCTION(StringPrototype::replace_all)
|
|||
return {};
|
||||
}
|
||||
|
||||
auto utf16_string_view = string.view();
|
||||
auto string_length = utf16_string_view.length_in_code_units();
|
||||
|
||||
auto utf16_search_view = search_string.view();
|
||||
auto search_length = utf16_search_view.length_in_code_units();
|
||||
auto string_length = string.length_in_code_units();
|
||||
auto search_length = search_string.length_in_code_units();
|
||||
|
||||
Vector<size_t> match_positions;
|
||||
size_t advance_by = max(1u, search_length);
|
||||
auto position = string_index_of(utf16_string_view, utf16_search_view, 0);
|
||||
auto position = string_index_of(string.view(), search_string.view(), 0);
|
||||
|
||||
while (position.has_value()) {
|
||||
match_positions.append(*position);
|
||||
position = string_index_of(utf16_string_view, utf16_search_view, *position + advance_by);
|
||||
position = string_index_of(string.view(), search_string.view(), *position + advance_by);
|
||||
}
|
||||
|
||||
size_t end_of_last_match = 0;
|
||||
StringBuilder result;
|
||||
|
||||
for (auto position : match_positions) {
|
||||
auto preserved = utf16_string_view.substring_view(end_of_last_match, position - end_of_last_match);
|
||||
auto preserved = string.substring_view(end_of_last_match, position - end_of_last_match);
|
||||
String replacement;
|
||||
|
||||
if (replace_value.is_function()) {
|
||||
auto result = vm.call(replace_value.as_function(), js_undefined(), js_string(vm, utf16_search_view), Value(position), js_string(vm, utf16_string_view));
|
||||
auto result = vm.call(replace_value.as_function(), js_undefined(), js_string(vm, search_string), Value(position), js_string(vm, string));
|
||||
if (vm.exception())
|
||||
return {};
|
||||
|
||||
|
|
@ -1078,21 +1036,19 @@ JS_DEFINE_NATIVE_FUNCTION(StringPrototype::replace_all)
|
|||
if (vm.exception())
|
||||
return {};
|
||||
} else {
|
||||
replacement = get_substitution(global_object, utf16_search_view, utf16_string_view, position, {}, js_undefined(), replace_value);
|
||||
replacement = get_substitution(global_object, search_string.view(), string.view(), position, {}, js_undefined(), replace_value);
|
||||
if (vm.exception())
|
||||
return {};
|
||||
}
|
||||
|
||||
result.append(preserved.to_utf8(Utf16View::AllowInvalidCodeUnits::Yes));
|
||||
result.append(preserved);
|
||||
result.append(replacement);
|
||||
|
||||
end_of_last_match = position + search_length;
|
||||
}
|
||||
|
||||
if (end_of_last_match < string_length) {
|
||||
utf16_string_view = utf16_string_view.substring_view(end_of_last_match);
|
||||
result.append(utf16_string_view.to_utf8(Utf16View::AllowInvalidCodeUnits::Yes));
|
||||
}
|
||||
if (end_of_last_match < string_length)
|
||||
result.append(string.substring_view(end_of_last_match));
|
||||
|
||||
return js_string(vm, result.build());
|
||||
}
|
||||
|
|
@ -1114,12 +1070,11 @@ JS_DEFINE_NATIVE_FUNCTION(StringPrototype::search)
|
|||
auto string = this_object.to_utf16_string(global_object);
|
||||
if (vm.exception())
|
||||
return {};
|
||||
auto utf16_string_view = string.view();
|
||||
|
||||
auto rx = regexp_create(global_object, regexp, js_undefined());
|
||||
if (!rx)
|
||||
return {};
|
||||
return Value(rx).invoke(global_object, *vm.well_known_symbol_search(), js_string(vm, utf16_string_view));
|
||||
return Value(rx).invoke(global_object, *vm.well_known_symbol_search(), js_string(vm, move(string)));
|
||||
}
|
||||
|
||||
// B.2.3.2.1 CreateHTML ( string, tag, attribute, value ), https://tc39.es/ecma262/#sec-createhtml
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue