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2009 Java One State Of The Open Web
This document summarizes key aspects of fast JavaScript virtual machines (VMs) like V8, with a focus on Google's V8 VM. It discusses the challenges of optimizing JavaScript given its dynamic nature. The V8 VM addresses this through techniques like hidden classes to group similar objects, compilation to native code with inline caching, and efficient generational garbage collection. Hidden classes allow optimizing object property access like in static languages. Inline caching handles dynamic property lookups at runtime. Memory is managed through precise generational garbage collection across multiple generations and memory spaces. These techniques allow V8 to optimize JavaScript and achieve fast performance for large programs.
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