|Original author(s)||Lars Bak of Google|
|Developer(s)||The Chromium Project|
|Initial release||2 September 2008|
9.0 / 17 March 2021
|Platform||IA-32, x86-64, ARM, AArch64, MIPS, MIPS64 PowerPC, IBM s390|
The V8 assembler is based on the Strongtalk assembler. On 7 December 2010, a new compiling infrastructure named Crankshaft was released, with speed improvements. In version 41 of Chrome in 2015, project TurboFan was added to provide more performance improvements with previously challenging workloads such as asm.js.
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.
V8 first generates an abstract syntax tree with its own parser. Then, Ignition generates bytecode from this syntax tree using the internal V8 bytecode format. TurboFan compiles this bytecode into machine code. In other words, V8 compiles ECMAScript directly to native machine code using just-in-time compilation before executing it. 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.
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
- Electron desktop application framework, used by the Atom and Visual Studio Code text editors
- MarkLogic database server
- NativeScript mobile application framework
- Node.js runtime environment
- Qt Quick runtime environment
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