Escargot

Escargot is a lightweight JavaScript engine developed by Samsung, designed specifically for resource-constrained environments. It is optimized for performance and low memory usage, making it ideal for use in embedded systems, IoT devices, and other applications where resources are limited.

Key features of Escargot include:

ECMAScript Compliance: Escargot supports a significant portion of the latest ECMAScript version (ECMAScript 2024), ensuring compatibility with modern JavaScript standards while maintaining a lightweight footprint.
Memory Efficiency: The engine is designed with memory constraints in mind, making it suitable for devices with limited RAM and storage.
Performance Optimization: Escargot implements various optimization techniques to ensure fast execution of JavaScript code, even on low-power devices.
Extensibility: The engine can be customized and extended to meet the specific needs of different applications, providing flexibility for developers.

Escargot is an open-source project that allows developers to contribute to its development or use it in their own projects, while also powering several services in Samsung products. The engine's design prioritizes simplicity and efficiency, making it an excellent choice for developers working in embedded or resource-limited environments.

Contents 📋

Building
- Linux
- macOS
- Android
- Windows
Testing
Contributing
Research Papers
License

Building 🛠️

Supported Platforms and Architectures

OS	Architecture
Linux(Ubuntu)	x86/x64/arm/aarch64
macOS	x64
Windows	x86
Android	x86/x64/arm/aarch64

Build Options

The following build options are supported when generating ninja rules using cmake.

Option	Description	Flag	Value	Default
HOST	Choose target platform	-DESCARGOT_HOST	linux/darwin/android/windows
ARCH	Choose target architecture	-DESCARGOT_ARCH	x64/x86/arm/aarch64
MODE	Choose release/debug mode	-DESCARGOT_MODE	release/debug	release
OUTPUT	Choose build output type	-DESCARGOT_OUTPUT	shared_lib/static_lib/shell/cctest	shell
LIBICU	Include libicu library	-DESCARGOT_LIBICU_SUPPORT	ON/OFF	ON
THREADING	Enable threading features (e.g. Atomics, SharedArrayBuffer)	-DESCARGOT_THREADING	ON/OFF	OFF
WASM	Enable WebAssembly support	-DESCARGOT_WASM	ON/OFF	OFF
CODE_CACHE	Enable code cache	-DESCARGOT_CODE_CACHE	ON/OFF	OFF
TCO	Enable tail call optimization	-DESCARGOT_TCO	ON/OFF	OFF
SMALL_CONFIG	Enable aggressive memory optimizations for tiny devices	-DESCARGOT_SMALL_CONFIG	ON/OFF	OFF
TEST	Enable additional features used only for testing	-DESCARGOT_TEST	ON/OFF	OFF

Linux

General build prerequisites:

sudo apt-get install autoconf automake cmake libtool libicu-dev ninja-build

Prerequisites for x86-64-to-x86 compilation:

sudo apt-get install gcc-multilib g++-multilib
sudo apt-get install libicu-dev:i386

Build Escargot:

git submodule update --init third_party # update submodules
cmake -DESCARGOT_MODE=release -DESCARGOT_OUTPUT=shell -GNinja
ninja

macOS

General build prerequisites:

brew install autoconf automake cmake icu4c libtool ninja pkg-config

Build Escargot:

git submodule update --init third_party # update submodules
cmake -DESCARGOT_MODE=release -DESCARGOT_OUTPUT=shell -GNinja
ninja

Android

Build prerequisites on Ubuntu:

sudo apt install openjdk-17-jdk # require java 17

Build Escargot using gradle:

git submodule update --init third_party # update submodules
export ANDROID_SDK_ROOT=.... # set your android SDK root first
cd build/android/
./gradlew bundleReleaseAar # build escargot AAR
./gradlew bundleHostJar # bundle jar for host
./gradlew javadocJar # create java doc
./gradlew sourcesJar # create sources jar

./gradlew assembleDebug # build debug test shell
./gradlew :escargot:connectedDebugAndroidTest # run escargot-jni tests on android device
./gradlew :escargot:testDebugUnitTest # run escargot-jni tests on host

Windows

Install VS2022 with cmake and ninja. Open [ x86 Native Tools Command Prompt for VS 2022 | x64 Native Tools Command Prompt for VS 2022 ]

git submodule update --init third_party # update submodules

CMake -G "Visual Studio 17 2022" -DCMAKE_SYSTEM_NAME=[ Windows | WindowsStore ] -DCMAKE_SYSTEM_VERSION:STRING="10.0"  -DCMAKE_SYSTEM_PROCESSOR=[ x86 | x64 ] -DCMAKE_GENERATOR_PLATFORM=[ Win32 | x64 ],version=10.0.18362.0 -DESCARGOT_ARCH=[ x86 | x64 ] -DESCARGOT_MODE=release -Bout -DESCARGOT_HOST=windows -DESCARGOT_OUTPUT=shell -DESCARGOT_LIBICU_SUPPORT=ON -DESCARGOT_LIBICU_SUPPORT_WITH_DLOPEN=OFF -DESCARGOT_THREADING=ON
cd out
msbuild ESCARGOT.sln /property:Configuration=Release /p:platform=[ Win32 | x64 ]

Testing ✅

Escargot supports various benchmark sets, which can be run using the tools/run-tests.py script.

Benchmark	flag
SunSpider 1.0.2	`sunspider`
Octane 2.0	`octane`
test262	`test262`
Web Tooling Benchmark	`web-tooling-benchmark`
SpiderMonkey (vendor-made)	`spidermonkey`
ChakraCore (vendor-made)	`chakracore`
V8 (vendor-made)	`v8`

Run each benchmark separately or all together as shown below:

tools/run-tests.py --engine=./out/linux/x64/release/escargot web-tooling-benchmark
tools/run-tests.py --engine=./out/linux/x64/release/escargot spidermonkey test262 v8

Contributing 💡

Escargot welcomes contributions from developers in any form, wheter it's code, documentation, bug reports, or suggestions. By contributing to the project, you agree to license your contributions under the LGPL-2.1 license.

❗ Vulnerability Reporting

⚠️ If you identify any vulnerabilities, please report them through the Issues page. Reports sent via other channels may not be considered or may be processed with delays. Please note that our project assumes the execution of valid JavaScript source code only. Handling of invalid source code is not within the main scope of this project and might not be addressed.

Research Papers 📝

Dynamic code compression for JavaScript engine
Software: Practice and Experience Vol. 53 (5), pp. 1196-1217, 2023
Tail Call Optimization Tailored for Native Stack Utilization in JavaScript Runtimes
IEEE Access Vol. 12, pp. 111801-111817, 2024

License 📜

Escargot is open-source software primarily licensed under LGPL-2.1, with some components covered by other licenses. Complete license and copyright information can be found in the source code.