Compilers and Virtual Machines

Igalia is the most experienced JavaScript virtual machine engineering consultancy contributing code upstream to V8, JavaScriptCore and SpiderMonkey. We also apply our compilers knowledge to work in other dynamic language implementations like Python, Scheme, Ruby and more.

Compiler technology is at the heart of performance optimization: compilers generate the machine code that will run your software, and as such, they are the main responsible actors in making the best use of the CPU instruction set to get the job done in the most efficient way possible.

We have the best team of WebKit developers with a strong competence in JavaScript engines like V8, JavaScriptCore and SpiderMonkey, making Igalia the best partner of choice for optimizing consumer electronic solutions based on client-side web technology.

We specialize in JavaScript upstream work as well as other domains such as debuggers (GDB and integrated debuggers), dynamic language environments integration to existing C/C++ systems, and Guile Scheme compiler, especially in the optimizer and its next-generation virtual machine.

Igalia has talented engineers who understand how compilers work and can optimize how they generate machine code for your programs, providing that performance boost that can make a real difference. Our team can provide holistic optimizations: in the runtime, on the frontend, the optimizer and in the backend.

We can also help companies developing Javascript-based software and products, advising on their design and implementation choices or programming and upstreaming new features required in the javascript engine.

Featured Media

Spelunking through JPEG with Racket (Sixth RacketCon, 2016)
Knit, Chisel, Hack: Building Programs in Guile Scheme (Strange Loop 2016)
Optimizing with persistent data structures (LLVM Cauldron 2016)
The future of small languages (FOSDEM 2016)
Guile 2.2 performance notes (FOSDEM 2016)
Property-based testing an open-source compiler, pflua (FOSDEM 2015)
Self-hosted JavaScript (ffconf 2014)
High performance packet filtering with Pflua (FOSDEM 2015)
Adrian Perez de Castro: JavaScript in JavaScript: Inception at JSConf EU 2014
Andy Wingo: DIY Internet: Snappy, Secure Networking with MinimaLT -- JSConf EU 2013
Andy Wingo: JavaScriptCore's DFG JIT -- JSConf EU 2012
Andy Wingo at JSConf USA 2012


Andy Wingo 12/10/2016

An incomplete history of language facilities for concurrency

I have lately been in the market for better concurrency facilities in Guile. I want to be able to write network servers and peers that can gracefully, elegantly, and efficiently handle many tens of thousands of clients and other connections, but without...

Andy Wingo 21/09/2016

is go an acceptable cml?

Yesterday I tried to summarize the things I know about Concurrent ML, and I came to the tentative conclusion that Go (and any Go-like system) was an acceptable CML. Turns out I was both wrong and right.you were wrong when you said everything's gonna...

Andy Wingo 20/09/2016

concurrent ml versus go

Peoples! Lately I've been navigating the guile-ship through waters unknown. This post is something of an echolocation to figure out where the hell this ship is and where it should go.Concretely, I have been working on getting a nice lightweight...


Awaiting the future of JavaScript in V8

On the evening of Monday, May 16th, 2016, we have made history. We’ve landed the initial implementation of “Async Functions” in V8, the JavaScript runtime in use by the Google Chrome and Node.js. We do these things not because they...

Andy Wingo 08/02/2016

a lambda is not (necessarily) a closure

prefaceGreets, 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...


Changeset in webkit [215810]: [JSC] fix RETURN_IF_EXCEPTION() placement in ownPropertyKeys() ...

2 edits in trunk/Source/JavaScriptCore [JSC] fix RETURN_IF_EXCEPTION() placement in ownPropertyKeys() ​https://bugs.webkit.org/show_bug.cgi?id=171330 Reviewed by Mark Lam. Ensure RETURN_IF_EXCEPTION() following invokation of...

Caitlin Potter26/04/2017

Changeset in webkit [215799]: [JSC] Object.keys() must discard property names with no ...

5 edits in trunk [JSC] Object.keys() must discard property names with no PropertyDescriptor ​https://bugs.webkit.org/show_bug.cgi?id=171291 Reviewed by Yusuke...

Caitlin Potter26/04/2017

[async-iteration] delete AsyncGeneratorYield builtin

[async-iteration] delete AsyncGeneratorYield builtin The AsyncGeneratorYield builtin just invoked the AsyncGeneratorResolve() stub anyways, so this removes the middle-man. Really minor refactoring, but clears out a bit of snapshot size and another...

Caitlin Potter25/04/2017

[parser] don't treat SuperCall as a valid DestructuringAssignmentTarget

[parser] don't treat SuperCall as a valid DestructuringAssignmentTarget BUG=v8:6291, v8:811 R=marja@chromium.org, vogelheim@chromium.org Change-Id: I978ea446d7b42092592b0a3ae3c99626e36d40fd Reviewed-on:...

Caitlin Potter25/04/2017

[parser] don't treat new.target as a valid DestructuringAssignmentTarget

[parser] don't treat new.target as a valid DestructuringAssignmentTarget BUG=v8:6291, v8:811 R=marja@chromium.org, vogelheim@chromium.org Change-Id: Icf18b1cba8562aab87d233d383eb1d73a8e6aa9d Reviewed-on:...

Caitlin Potter25/04/2017