Muscalietjs: Rethinking layered dynamic web runtimes


Layered JavaScript engines, in which the JavaScript run-time is built on top another managed runtime, provide better extensibility and portability compared to traditional mono-lithic engines. In this paper, we revisit the design of layered JavaScript engines and propose a layered architecture, called MuscalietJS2, that splits the responsibilities of a JavaScript engine between a high-level, JavaScript-specific component and a low-level, language-agnostic.NET VM. To make up for the performance loss due to layering, we propose a two pronged approach: high-level JavaScript optimizations and exploitation of low-level VM features that produce very effi-cient code for hot functions. We demonstrate the validity of the MuscalietJS design through a comprehensive evaluation using both the Sunspider benchmarks and a set of web work-loads. We demonstrate that our approach outperforms other layered engines such as IronJS and Rhino engines while pro-viding extensibility, adaptability and portability

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