Abstract
AbstractWeb applications have been gaining huge popularity due to being platform independent and also enabling fast development. Unfortunately, due to insufficient performance of web applications, they are generally limited to non-performance-critical use. The performance of web applications is largely affected by the performance of JavaScript. To address this problem, modern JavaScript engines such as Google’s V8 incorporate many state-of-the-art optimization and engineering techniques. In industry, recent approaches are to extend JavaScript to decorate objects with types to better utilize just-in-time (JIT) compilers.In this paper, we present Typed JS, a subset of JavaScript that utilizes type-decorated syntax. Unlike previous approaches, Typed JS supports most of the JS core operations while utilizing the ahead-of-time (AOT) compilation technique, which was not possible in the existing solution. Typed JS is specifically designed for running Web applications on mobile devices with goals of having smaller memory footprint while achieving high-performance, which is accomplished by utilizing the type information and AOT technique. Experiments show that Typed JS requires significantly much less memory usage while performing better than industry-leading JavaScript engines on a mobile platform.KeywordsTyped JavaScriptStatic typeMobile
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