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What's inside of TurboFan? (agentconf Jan '18)
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V8 release v6.4 · V8
Every six weeks, we create a new branch of V8 as part of our release process. Each version is branched from V8’s Git master immediately before a Chrome Beta milestone. Today we’re pleased to announce our newest branch, V8 version 6.4, which is in beta until its release in coordination with Chrome 64 Stable in several weeks. V8 v6.4 is filled with all sorts of developer-facing goodies. This post pr
JavaScript code coverage · V8
Show navigation Code coverage provides information about whether, and optionally how often certain parts of an application have been executed. It’s commonly used to determine how thoroughly a test suite exercises a particular codebase. Why is it useful? #As a JavaScript developer, you may often find yourself in a situation in which code coverage could be useful. For instance: Interested in the qua
Runtime type information for JavaScript
Get types like string, number, null, or custom classes at runtime. V8 can now collect type information. V8 is Google’s open source JavaScript engine. Chrome, Node.js, and many other applications use V8. This type profiler is built into the engine, the information is not statically inferred. JavaScript is a dynamically typed language. But most code is written with fixed types in mind. When debuggin
How JavaScript works: memory management + how to handle 4 common memory leaks
A few weeks ago we started a series aimed at digging deeper into JavaScript and how it actually works: we thought that by knowing the building blocks of JavaScript and how they come to play together you’ll be able to write better code and apps. The first post of the series focused on providing an overview of the engine, the runtime, and the call stack. Thе second post examined closely the internal
Elements kinds in V8 · V8
Show navigation Note: If you prefer watching a presentation over reading articles, then enjoy the video below! JavaScript objects can have arbitrary properties associated with them. The names of object properties can contain any character. One of the interesting cases that a JavaScript engine can choose to optimize for are properties whose names are purely numeric, most specifically array indices.
V8 release v6.2 · V8
Every six weeks, we create a new branch of V8 as part of our release process. Each version is branched from V8’s Git master immediately before a Chrome Beta milestone. Today we’re pleased to announce our newest branch, V8 version 6.2, which is in beta until its release in coordination with Chrome 62 Stable in several weeks. V8 v6.2 is filled with all sorts of developer-facing goodies. This post pr
How JavaScript works: inside the V8 engine + 5 tips on how to write optimized code
Couple of weeks ago we started a series aimed at digging deeper into JavaScript and how it actually works: we thought that by knowing the building blocks of JavaScript and how they come to play together you’ll be able to write better code and apps. The first post of the series focused on providing an overview of the engine, the runtime and the call stack. This second post will be diving into the i
Understanding V8’s Bytecode
V8 is Google’s open source JavaScript engine. Chrome, Node.js, and many other applications use V8. This article explains V8’s bytecode format — which is actually easy to read once you understand some basic concepts. This post is available in Chinese, translated by justjavac. Ignition! We have lift-off! Interpreter Ignition is part of our compiler pipeline since 2016.When V8 compiles JavaScript cod
V8 release v6.1 · V8
Every six weeks, we create a new branch of V8 as part of our release process. Each version is branched from V8’s Git master immediately before a Chrome Beta milestone. Today we’re pleased to announce our newest branch, V8 version 6.1, which is in beta until its release in coordination with Chrome 61 Stable in several weeks. V8 v6.1 is filled with all sorts of developer-facing goodies. We’d like to
Launching Ignition and TurboFan · V8
Show navigation Today we are excited to announce the launch of a new JavaScript execution pipeline for V8 v5.9 that will reach Chrome Stable in v59. With the new pipeline, we achieve big performance improvements and significant memory savings on real-world JavaScript applications. We’ll discuss the numbers in more detail at the end of this post, but first let’s take a look at the pipeline itself.
Fast for-in in V8 · V8
for-in is a widely used language feature present in many frameworks. Despite its ubiquity, it is one of the more obscure language constructs from an implementation perspective. V8 went to great lengths to make this feature as fast as possible. Over the course of the past year, for-in became fully spec-compliant and up to 3 times faster, depending on the context. Many popular websites rely heavily
V8: Behind the Scenes (February Edition feat. A tale of TurboFan) · Benedikt Meurer
Benedikt Meurer JavaScript Engine Hacker and Programming Language Enthusiast. V8: Behind the Scenes (February Edition feat. A tale of TurboFan) 01 Mar 2017 turbofan • v8February has been an exciting and very, very busy month for me. As you have probably heard, we’ve finally announced that we will launch the Ignition+TurboFan pipeline in Chrome 59. So despite running late, and not making it for Feb
Node.js — Node v7.6.0 (Current)
Notable changes deps: update V8 to 5.5 (Michaël Zasso) #11029 upgrade libuv to 1.11.0 (cjihrig) #11094 add node-inspect 1.10.4 (Jan Krems) #10187 upgrade zlib to 1.2.11 (Sam Roberts) #10980 lib: build node inspect into node (Anna Henningsen) #10187 crypto: Remove expired certs from CNNIC whitelist (Shigeki Ohtsu) #9469 inspector: add --inspect-brk (Josh Gavant) #11149 fs: allow WHATWG URL objects
High-performance ES2015 and beyond · V8
Show navigation Over the last couple of months the V8 team focused on bringing the performance of newly added ES2015 and other even more recent JavaScript features on par with their transpiled ES5 counterparts. Motivation #Before we go into the details of the various improvements, we should first consider why performance of ES2015+ features matter despite the widespread usage of Babel in modern we
Help us test the future of V8! · V8
Show navigation The V8 team is currently working on a new default compiler pipeline that will help us bring future speedups to real-world JavaScript. You can preview the new pipeline in Chrome Canary today to help us verify that there are no surprises when we roll out the new configuration for all Chrome channels. The new compiler pipeline uses the Ignition interpreter and TurboFan compiler to exe
V8 release v5.7 · V8
Every six weeks, we create a new branch of V8 as part of our release process. Each version is branched from V8’s Git master immediately before a Chrome Beta milestone. Today we’re pleased to announce our newest branch, V8 version 5.7, which will be in beta until it is released in coordination with Chrome 57 Stable in several weeks. V8 5.7 is filled with all sorts of developer-facing goodies. We’d
Reddit - Dive into anything
Chat about javascript and javascript related projects. Yes, typescript counts. Please keep self promotion to a minimum/reasonable level. Last week I've spent a full day to fix very strange behavior in a single page application for my customer that only happens on Chrome 51 (maybe 52, but not in Canary 53). After a while our SPA started behaving incorrectly... It turned out to be a nasty bug in the
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V8 puzzle | victor felder
A Little on V8 and WebAssembly
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