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Good day! Today I'd like to write a bit about the WebAssembly baseline compiler in Firefox. background: throughput and latency WebAssembly, as you know, is a virtual machine that is present in web browsers like Firefox. An important initial goal for WebAssembly was to be a good target for compiling programs written in C or C++. You can visit a web page that includes a program written in C++ and co

Hello, all! Today I'd like to share some work I have done recently as part of the Snabb user-space networking toolkit. Snabb is mainly about high-performance packet processing, but it also needs to communicate with management-oriented parts of network infrastructure. These communication needs are performed by a dedicated manager process, but that process has many things to do, and can't afford to

preface Greets, folks! Check it out: Guile had a whole track devoted to it at FOSDEM this year. OK, so it was only half a day, but there were like a dozen talks! And the room was full all the morning! And -- get this -- I had nothing to do with its organization! I think we can credit the Guix project with the recent surge of interest in Guile; fully half the talks were from people excited about us

It's been a long time coming, but I just flipped the bit in V8 that will ship arrow functions in Chrome 45! Woo hoo! You probably know, but arrow functions are a new way to write functions in JavaScript. They look like this: // Two arguments, body implicitly returned. (x, y) => x + y // With just one argument, no parentheses needed. x => x * 2 // Body can have braces too; in that case use "return"

Peoples! Firefox now optimizes let-bound variables! What does this mean, you ask? Well, as you nerdy wingolog readers probably know, the new ECMAScript 6 standard is coming soon. ES6 has new facilities that make JavaScript more expressive. At the same time, though, many ES6 features stress parts of JavaScript engines that are currently ignored. One of these areas is lexical scope. Until now, with

It is my great pleasure to announce that SpiderMonkey, the JavaScript engine of the Firefox browser, just got support for ES6 generators and iteration! the chase As I have written before, generators are functions that can suspend. SpiderMonkey has had generators since Firefox 2 (really!), but the new thing is that now their generators are standard, and available by default. No need to futz with Fi

It's been really gratifying to see the recent interest in ES6 generators in V8. I'm still a Schemer at heart, but one thing all language communities should learn from JS is its enthusiasm and sense of joyful play. One can't spend much time around folks like James Long or Domenic Denicola without feeling the urge to go out and build something fun. perfie perf perf perf But this is a blog about narg

Hey y'all, ES6 generators have landed in V8! Excellent! Many of you know what that means already, but for those of you that don't, a little story. A few months ago I was talking with Andrew Paprocki over at Bloomberg. They use JavaScript in all kinds of ways over there, and as is usually the case in JS, it often involves communicating with remote machines. This happens on the server side and on th

Hark, the beloved programing language! But hark, also: for Scheme is a language of many implementations. If Scheme were a countryside, it would have its cosmopolitan cities, its hipster dives, its blue-collar factory towns, quaint villages, western movie sets full of façades and no buildings, shacks in the woods, and single-occupancy rent-by-the-hour slums. It's a confusing and delightful place, b

Good day, hackers! And hello to the rest of you, too, though I fear that this article isn't for you. In the vertical inches that follow, we're going to nerd out with JavaScriptCore's new low-level interpreter. So for those of you that are still with me, refill that coffee cup, and get ready for a look into a lovely hack! hot corn, cold corn Earlier this year, JavaScriptCore got a new interpreter,

I'm sitting on a train waiting to leave Paris for Barcelona, returning from the 2011 GNU Hackers Meeting. It was fantastic, clearly the best we have had yet. Thanks a lot to Ludovic Courtès for organizing it, and to IRILL and Sylvestre Ledru for hosting. I hope to write more about it in the future, but this essay will be long enough :) I gave a talk entitled "The User in the Loop", which made the

My readers will know that I have recently had the pleasure of looking into the V8 JavaScript implementation, from Google. I'm part of a small group in Igalia doing compiler work, and it's clear that in addition to being lots of fun, JavaScript implementations are an important part of the compiler market today. But V8 is not the only JS implementation in town. Besides Mozilla's SpiderMonkey, which

Friends, I have an admission to make: I am a functional programmer. By that I mean that lambda is my tribe. And you know how tribalism works: when two tribes meet, it's usually to argue and not to communicate. So it is that I've been well-indoctrinated in the lore of the lambda calculus, continuation-passing style intermediate languages, closure conversion and lambda lifting. But when it comes to

Greets greets! Today, an update on recent progress in Whippet, including sponsorship, a new collector, and a new feature. the lob, the pitchBut first, a reminder of what the haps: Whippet is a garbage collector library. The target audience is language run-time authors, particularly “small” run-times: wasm2c, Guile, OCaml, and so on; to a first approximation, the kinds of projects that currently us

wingolog: articles with the tag "v8".

Continuing in my series of articles on V8, Google's JavaScript engine, in this article I'd like to take a closer look at V8's optimizing compiler, with a focus on the Hydrogen intermediate language. brief summary As my readers might recall, Crankshaft is the marketing name of V8's optimizing compiler. It complements the "full" compiler by optimizing hot functions, while ignoring uncommon cases. It

In my last note I mentioned that I had been doing a lot of reading of JavaScript implementation code. One point that I didn't mention is that the state of the art is completely undocumented. So to work on rectifying that, here's the first in what might be a series of articles about the internals of JavaScript implementations. tagging Initially, all JavaScript implementations used tagged pointers t

Guile now does delimited continuations. Ahem! I say: Guile now does delimited continuations! Whoop whoop! Practically speaking, this means that Guile implements prompt and abort, as described in Dorai Sitaram's 1993 paper, Handling Control. (Guile's abort is the operator that Sitaram calls control.) I used to joke that all of this Guile compilation work was to bring Guile back into the 2000s, from