V8 (JavaScript engine)

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V8 JavaScript Engine
V8 JavaScript engine logo.png
Developer(s) The Chromium Project
Stable release 4.5[1] / September 8, 2015; 5 months ago (2015-09-08)
Development status Active
Written in C++,[2] JavaScript[2]
Operating system Cross-platform
Platform IA-32, x86-64, ARM, MIPS,[3] PowerPC, IBM s390
Type JavaScript engine
License BSD[4]
Website developers.google.com/v8

The V8 JavaScript Engine is an open source JavaScript engine developed by The Chromium Project for the Google Chrome web browser.[5] It has since seen use in many other projects, such as Couchbase , MongoDB and Node.js that are used server side. As of 2012, the head programmer is Lars Bak.[6] The first version of the V8 engine was released at the same time as the first version of Chrome, September 2, 2008.

V8 compiles JavaScript to native machine code (IA-32, x86-64, ARM, or MIPS ISAs; has also been ported to PowerPC[7] and IBM s390[8][9] for use in servers)[3][10] before executing it, instead of more traditional techniques such as interpreting bytecode or compiling the whole program to machine code and executing it from a filesystem. The compiled code is additionally optimized (and re-optimized) dynamically at runtime, based on heuristics of the code's execution profile. Optimization techniques used include inlining, elision of expensive runtime properties, and inline caching, among many others.


The garbage collector of V8 is a generational incremental collector.[11] The V8 assembler is based on the Strongtalk assembler.[12] On 7 December 2010, a new compiling infrastructure named Crankshaft was released, with speed improvements.[13]


V8 is intended to be used both in a browser (notably in Chrome and Chromium browsers) and as a standalone high-performance engine that can be integrated into independent projects, for example server-side JavaScript in Node.js,[14] or client side JavaScript in .NET/Mono using V8.NET.

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