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https://github.com/RGBCube/serenity
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7b863330dc
Roughly 7% of test-js runtime was spent creating FlyStrings from string literals. This patch frontloads that work and caches all the commonly used names in LibJS on a CommonPropertyNames struct that hangs off VM.
135 lines
4.7 KiB
C++
135 lines
4.7 KiB
C++
/*
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* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <AK/StringBuilder.h>
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#include <AK/Utf32View.h>
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#include <LibJS/Runtime/Array.h>
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#include <LibJS/Runtime/Error.h>
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#include <LibJS/Runtime/GlobalObject.h>
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#include <LibJS/Runtime/StringConstructor.h>
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#include <LibJS/Runtime/StringObject.h>
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namespace JS {
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StringConstructor::StringConstructor(GlobalObject& global_object)
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: NativeFunction(vm().names.String, *global_object.function_prototype())
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{
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}
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void StringConstructor::initialize(GlobalObject& global_object)
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{
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auto& vm = this->vm();
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NativeFunction::initialize(global_object);
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define_property(vm.names.prototype, global_object.string_prototype(), 0);
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define_property(vm.names.length, Value(1), Attribute::Configurable);
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u8 attr = Attribute::Writable | Attribute::Configurable;
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define_native_function(vm.names.raw, raw, 1, attr);
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define_native_function(vm.names.fromCharCode, from_char_code, 1, attr);
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}
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StringConstructor::~StringConstructor()
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{
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}
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Value StringConstructor::call()
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{
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if (!vm().argument_count())
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return js_string(heap(), "");
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if (vm().argument(0).is_symbol())
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return js_string(heap(), vm().argument(0).as_symbol().to_string());
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auto* string = vm().argument(0).to_primitive_string(global_object());
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if (vm().exception())
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return {};
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return string;
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}
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Value StringConstructor::construct(Function&)
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{
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PrimitiveString* primitive_string = nullptr;
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if (!vm().argument_count())
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primitive_string = js_string(vm(), "");
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else
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primitive_string = vm().argument(0).to_primitive_string(global_object());
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if (!primitive_string)
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return {};
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return StringObject::create(global_object(), *primitive_string);
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}
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JS_DEFINE_NATIVE_FUNCTION(StringConstructor::raw)
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{
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auto* template_object = vm.argument(0).to_object(global_object);
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if (vm.exception())
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return {};
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auto raw = template_object->get(vm.names.raw);
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if (vm.exception())
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return {};
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if (raw.is_empty() || raw.is_nullish()) {
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vm.throw_exception<TypeError>(global_object, ErrorType::StringRawCannotConvert, raw.is_null() ? "null" : "undefined");
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return {};
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}
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if (!raw.is_array())
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return js_string(vm, "");
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auto* array = static_cast<Array*>(raw.to_object(global_object));
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auto& raw_array_elements = array->indexed_properties();
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StringBuilder builder;
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for (size_t i = 0; i < raw_array_elements.array_like_size(); ++i) {
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auto result = raw_array_elements.get(array, i);
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if (vm.exception())
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return {};
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if (!result.has_value())
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continue;
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builder.append(result.value().value.to_string(global_object));
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if (vm.exception())
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return {};
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if (i + 1 < vm.argument_count() && i < raw_array_elements.array_like_size() - 1) {
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builder.append(vm.argument(i + 1).to_string(global_object));
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if (vm.exception())
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return {};
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}
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}
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return js_string(vm, builder.build());
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}
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JS_DEFINE_NATIVE_FUNCTION(StringConstructor::from_char_code)
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{
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StringBuilder builder;
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for (size_t i = 0; i < vm.argument_count(); ++i) {
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auto char_code = vm.argument(i).to_i32(global_object);
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if (vm.exception())
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return {};
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auto truncated = char_code & 0xffff;
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// FIXME: We need an Utf16View :^)
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builder.append(Utf32View((u32*)&truncated, 1));
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}
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return js_string(vm, builder.build());
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}
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}
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