V8 (JavaScript engine)

V8
Original author(s)	Lars Bak of Google
Developer(s)	The Chromium Project
Initial release	2 September 2008; 12 years ago
Stable release	9.0 / 17 March 2021; 2 months ago
Repository	chromium.googlesource.com/v8/v8;
Written in	C++
Platform	IA-32, x86-64, ARM, AArch64, MIPS, MIPS64PowerPC, IBM s390
Type	JavaScript engine
License	BSD
Website	v8.dev

V8 is an open-source JavaScript engine developed by The Chromium Project for Google Chrome and Chromium web browsers.^[5] The project’s creator is Lars Bak.^[6] The first version of the V8 engine was released at the same time as the first version of Chrome: 2 September 2008. It has also been used on the server side, for example in Couchbase, and Node.js.

History

The V8 assembler is based on the Strongtalk assembler.^[7] On 7 December 2010, a new compiling infrastructure named Crankshaft was released, with speed improvements.^[8] In version 41 of Chrome in 2015, project TurboFan was added to provide more performance improvements with previously challenging workloads such as asm.js.^[9]

In 2016, the Ignition interpreter was added to V8 with the design goal of reducing the memory usage on small memory Android phones in comparison with TurboFan and Crankshaft.^[10]

In 2017, V8 shipped a brand-new compiler pipeline, consisting of Ignition (the interpreter) and TurboFan (the optimizing compiler). Starting with V8 version 5.9, Full-codegen (the early baseline compiler) and Crankshaft are no longer used in V8 for JavaScript execution, since the team believed they were no longer able to keep pace with new JavaScript language features and the optimizations those features required.^[11]

Design

V8 first generates an abstract syntax tree with its own parser.^[12] Then, Ignition, the V8 interpreter, generates bytecode from this syntax tree using the internal V8 bytecode format.^[13] TurboFan is the V8 optimizing compiler, it takes this bytecode and generates machine code from it. In other words, V8 compiles JavaScript directly to native machine code using just-in-time compilation before executing it.^[14] 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. The garbage collector is a generational incremental collector.^[15]

Usage

V8 can compile to x86, ARM or MIPS instruction set architectures in both their 32- and 64-bit editions; as well, it has been ported to PowerPC^[16] and IBM s390^[17]^[18] for use in servers.^[3]^[19]

V8 can be used in a browser or integrated into independent projects. V8 is used in the following software:

Google Chrome and other Chromium-based web browsers, including Brave, Opera, Vivaldi and Microsoft Edge.
Couchbase database server
Deno runtime environment^[20]
Electron desktop application framework, used by the Atom and Visual Studio Code text editors
MarkLogic database server
NativeScript mobile application framework^[21]
Node.js runtime environment^[22]
Qt Quick runtime environment^[23]

References

^ "V8 release v9.0". Retrieved 17 March 2021.
^ "V8 JavaScript Engine". Google LLC.
^ ^a ^b "Introduction - Chrome V8". Google Inc.
^ "v8/LICENSE.v8 at master". Github.
^ Lenssen, Philipp (1 September 2008). "Google on Google Chrome - comic book". Google Blogoscoped. Retrieved 17 August 2010.
^ Minto, Rob (27 March 2009). "The genius behind Google's web browser". Financial Times. Archived from the original on 1 December 2011. Retrieved 1 June 2021.(subscription required)
^ "V8 JavaScript Engine: License". Google Code. Archived from the original on July 22, 2010. Retrieved 17 August 2010.
^ "A New Crankshaft for V8". Chromium Blog. 7 December 2010. Retrieved 22 April 2011.
^ "Revving up JavaScript performance with TurboFan". 7 July 2015. Retrieved 5 March 2016.
^ "BlinkOn 6 Day 1 Talk 2: Ignition - an interpreter for V8". 26 June 2016. Retrieved 2 September 2016.
^ "Launching Ignition and TurboFan". 16 May 2017. Retrieved 13 July 2017.
^ Verwaest, Toon (25 March 2019). "Blazingly fast parsing, part 1: optimizing the scanner · V8". v8.dev. Archived from the original on 21 April 2021. Retrieved 1 June 2021.
^ Hinkelmann, Franziska (2017-12-19). "Understanding V8's Bytecode". Medium. Retrieved 2019-10-17.
^ "Firing up the Ignition interpreter · V8". v8.dev. Retrieved 2020-09-30.
^ "A game changer for interactive performance". Chromium Blog. Retrieved 1 May 2012.
^ "GitHub - ibmruntimes/v8ppc: Port of Google V8 javascript engine to PowerPC®". April 21, 2019 – via GitHub.
^ "Port of Google V8 JavaScript engine to z/OS. The Linux on Z port is maintained in the community: ibmruntimes/v8z". April 2, 2019 – via GitHub.
^ "PPC support for Google V8 goes mainstream". June 30, 2015.
^ "V8 Changelog v3.8.2". Archived from the original on 22 October 2012. Retrieved 23 October 2012.
^ "A secure JavaScript/TypeScript runtime built with V8, Rust, and Tokio: denoland/deno". July 8, 2019 – via GitHub.
^ "Overview - NativeScript Docs". docs.nativescript.org.
^ Jolie O'Dell (March 10, 2011). "Why Everyone Is Talking About Node". Mashable.
^ "Difference between qt qml and qt quick". Stack Overflow. Retrieved 2020-09-26.

External links

Official website

[wikidata-18f51de180813225e283537ab03eda2a61ea8184-v3-1] "V8 release v9.0". Retrieved 17 March 2021.

[V8-2] "V8 JavaScript Engine". Google LLC.

[google_dev-3] "Introduction - Chrome V8". Google Inc.

[4] "v8/LICENSE.v8 at master". Github.

[comic-5] Lenssen, Philipp (1 September 2008). "Google on Google Chrome - comic book". Google Blogoscoped. Retrieved 17 August 2010.

[6] Minto, Rob (27 March 2009). "The genius behind Google's web browser". Financial Times. Archived from the original on 1 December 2011. Retrieved 1 June 2021.(subscription required)

[7] "V8 JavaScript Engine: License". Google Code. Archived from the original on July 22, 2010. Retrieved 17 August 2010.

[8] "A New Crankshaft for V8". Chromium Blog. 7 December 2010. Retrieved 22 April 2011.

[9] "Revving up JavaScript performance with TurboFan". 7 July 2015. Retrieved 5 March 2016.

[10] "BlinkOn 6 Day 1 Talk 2: Ignition - an interpreter for V8". 26 June 2016. Retrieved 2 September 2016.

[11] "Launching Ignition and TurboFan". 16 May 2017. Retrieved 13 July 2017.

[12] Verwaest, Toon (25 March 2019). "Blazingly fast parsing, part 1: optimizing the scanner · V8". v8.dev. Archived from the original on 21 April 2021. Retrieved 1 June 2021.

[13] Hinkelmann, Franziska (2017-12-19). "Understanding V8's Bytecode". Medium. Retrieved 2019-10-17.

[14] "Firing up the Ignition interpreter · V8". v8.dev. Retrieved 2020-09-30.

[15] "A game changer for interactive performance". Chromium Blog. Retrieved 1 May 2012.

[16] "GitHub - ibmruntimes/v8ppc: Port of Google V8 javascript engine to PowerPC®". April 21, 2019 – via GitHub.

[17] "Port of Google V8 JavaScript engine to z/OS. The Linux on Z port is maintained in the community: ibmruntimes/v8z". April 2, 2019 – via GitHub.

[18] "PPC support for Google V8 goes mainstream". June 30, 2015.

[19] "V8 Changelog v3.8.2". Archived from the original on 22 October 2012. Retrieved 23 October 2012.

[20] "A secure JavaScript/TypeScript runtime built with V8, Rust, and Tokio: denoland/deno". July 8, 2019 – via GitHub.

[21] "Overview - NativeScript Docs". docs.nativescript.org.

[22] Jolie O'Dell (March 10, 2011). "Why Everyone Is Talking About Node". Mashable.

[23] "Difference between qt qml and qt quick". Stack Overflow. Retrieved 2020-09-26.

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