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JavaScript Engine and WebAssembly
This document discusses JavaScript engines and WebAssembly. It describes several popular JavaScript engines like SpiderMonkey, V8, and Chakra. It explains how SpiderMonkey evolved through different optimizations like TraceMonkey and IonMonkey. It also discusses emscripten which compiles C/C++ to JavaScript, and asm.js which aimed for native performance from browser apps. Finally, it introduces WebAssembly as a binary format that can be decoded much faster than JavaScript and avoids constraints of asm.js while maintaining the same functionality and security permissions.
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JavaScript Engine and WebAssembly
- 1. JAVASCRIPT ENGINE AND WEBASSEMBLY 2016.2.18 동국대학교멀티미디어공학과 이창환 (yich@dongguk.edu) http://www.slideshare.net/yich/web-assembly
- 2. Contents • Source CodeExecutions • JavaScript Engine on FireFox • WebAssembly 2
- 3. Source Code Executions •Interpret • Compile • Interpret + Compile • JIT(Just-in-time) • AOT(ahead-of-time compile) • etc. 3
- 4.
- 5. JavaScript Engine • SpiderMonkey •A JavaScript engine in Mozilla Gecko applications • JavaScriptCore • A JavaScript interpreter and JIT originally derived from KJS(Konqueror’s Engine). • Used in the WebKit project • V8 • A JavaScript engine used in Google Chrome, Node.js, and V8.NET. • Chakra (JScript9) • A JScript engine used in Internet Explorer. • Chakra • A JavaScript engine used in Microsoft Edge. • Carakan • A JavaScript engine developed by Opera Software ASA • Tamarin • An ActionScript and ECMAScript engine used in Adobe Flash. • Nashorn • A JavaScript engine used in Oracle Java Development Kit (JDK) since version 8. • Rhino • One of several JavaScript engines from Mozilla, using the Java platform. 5
- 6. SpiderMonkey • From Netscapeand Firefox • History of SpiderMonkey • TraceMonkey: first javascript JIT, Firefox 3.5 • JägerMonkey: whole-method JIT, FireFox 4 • IonMonkey: Optimization • OdinMonkey: asm.js 6
- 7. emscripten • Emscripten • http://kripken.github.io/emscripten-site/ •C/C++ -> JavaScript • LLVM based Transpiler • asm.js • http://asmjs.org • From Mozilla • native performance from browser apps. • C/C++ -> javascript • Not javascript 7 http://ejohn.org/blog/asmjs-javascript-compile-target/
- 8. Typed Array /SIMD.js • TypedArray • https://www.khronos.org/registry/typedarray/specs/latest/ • WebGL • SIMD.js (Single Instruction Multiple Data) • https://hacks.mozilla.org/2014/10/introducing-simd-js/ 8
- 9. WebAssembly • Why? ASM.JSis not enough? • A binary format can be decoded A binary format can be decoded much faster than JavaScript; 20x faster • Avoiding the simultaneous Avoiding the simultaneous ASM.JS constrains constrains: AOT-compatibility and redundant optimization • High-Level Goals of WASM • Binary format also considering mobile and IoT • Incremental implementation Incremental implementation • Same functionality as ASM.JS • A polyfill library to translates WASM code into JavaScript • Languages other than C/C++ • Compatabile with existing Web Platform • Synchronous calls to and from JavaScript • Same security policy Same security policy • Access Same Web API accessible to JavaScript 9
- 10. References • List ofECMAScript engines, https://en.wikipedia.org/wiki/List_of_ECMAScript_engines • SpiderMonkey JavaScript Engine, http://new.whiteinternet.com/web- development/spidermonkey • WebAssembly • http://webassembly.github.io/ • https://github.com/webassembly • Web Assembly 기술 동향, http://www.html5forum.or.kr/api/filedown.jsp?filename=07 _WebAssembly.pdf&folder=upload/board , HTML5Forum 웹 고속화 기술과 킬러웹앱 컨퍼런스 10