[webkit-dev] node-jsc: A node.js port to the JavaScriptCore engine and iOS

Koby Boyango koby.b at mce.systems
Sun Sep 16 02:09:24 PDT 2018

Thanks for taking the time to look into the project :)

Filip - I would love to. Should I create one bug for all of the patches, or
a bug for each patch?
Also, there is an existing bug that I've reported a while ago, but worked
around it for now: https://bugs.webkit.org/show_bug.cgi?id=184232. It isn't
relevant in newer versions of node (it came from node's Buffer constructor,
which have changed since), but I'll still be happy to send a patch if

Yusuke - It's interesting to compare, especially on an iOS device. I will
also try to do some measurements :) Do you have a benchmark you recommend?
But assuming it is worth it, enabling LLInt ASM without the JIT would be
great as it would probably reduce the binary size and compilation time by
quite a bit.
NativeScript is also using it without the JIT (and they link to an article
containing some benchmarks), so they would profit from this too.


On Sat, Sep 15, 2018 at 2:51 AM Yusuke Suzuki <yusukesuzuki at slowstart.org>

> Really great!
> node-jsc sounds very exciting to me. From the users' view, t is nice if we
> run app constructed in node.js manner in iOS devices.
> In addition, from the JSC developers' view, it is also awesome. It allows
> us to easily run node.js libraries / benchmarks / tests on JSC, which is
> really great since,
> 1. We can run tests designed for node.js, it makes our JSC implementation
> more solid.
> 2. We can run benchmarks designed for node.js including JS libraries. JS
> libraries distributed in npm are more and more used in both node.js and
> browser world.
> If we can have a way to run benchmarks in popular libraries on JSC easily,
> that offers great opportunities to optimize JSC on them.
> On Sat, Sep 15, 2018 at 5:20 AM Filip Pizlo <fpizlo at apple.com> wrote:
>> Wow!  That’s pretty cool!
>> I think that it would be great for this to be upstreamed. Can you create
>> a bug on bugs.webkit.org and post your patches for review?
>> -Filip
>> On Sep 13, 2018, at 4:02 PM, Koby Boyango <koby.b at mce.systems> wrote:
>> Hi,
>> I'm Koby Boyango, a senior researcher and developer at mce, and I've
>> created node-jsc <https://github.com/mceSystems/node-jsc>, an
>> experimental port of node.js to the JavaScriptCore engine and iOS
>> specifically.
>> node-jsc's core component, "jscshim" (deps/jscshim)
>> <https://github.com/mceSystems/node-jsc/tree/master/deps/jscshim>,
>> implements (parts of) v8 API on top of JavaScriptCore. It contains a
>> stripped down version of WebKit's source code (mainly JSC and WTF). To
>> build WebKit, I'm using CMake to build the JSCOnly port, with JSC\WTF
>> compiled as static libraries. For iOS I'm using my own build script
>> <https://github.com/mceSystems/node-jsc/blob/master/deps/jscshim/tools/build_jsc.py>
>> with a custom toolchain file
>> <https://github.com/mceSystems/node-jsc/blob/master/deps/jscshim/tools/ios.toolchain.cmake>.
>> I'm really happy to hear that your node-jsc is using JSCOnly ports :)
>> The project also includes node-native-script
>> <https://github.com/mceSystems/node-native-script>, NativeScript's iOS
>> runtime refactored as node-jsc native module, allowing access to native iOS
>> APIs directly from javascript.
>> So first of all, I wanted to share this project with the WebKit developer
>> community.
>> It's my first time working with WebKit, and node-jsc has been a great
>> opportunity to experiment with it.
>> Second, as I needed to make some minor changes\additions, I'm using my
>> own fork <https://github.com/mceSystems/webkit>. I would love to discuss
>> some of the changes I've made, and offer some patches if you'll find them
>> useful.
>> "WebKit Fork and Compilation
>> <https://github.com/mceSystems/node-jsc/blob/master/deps/jscshim/docs/webkit_fork_and_compilation.md>"
>> describes WebKit's usage in node-jsc and the major changes\additions I've
>> made in my fork (node-jsc's README
>> <https://github.com/mceSystems/node-jsc/blob/master/README.md> and jschim's
>> documentation
>> <https://github.com/mceSystems/node-jsc/blob/master/deps/jscshim/docs/jscshim.md>
>> contains some more information).
>> Great, it is really nice if you have a patch for upstream :)
> Looking through the documents, I have one question on LLInt v.s. CLoop.
> https://github.com/mceSystems/node-jsc/blob/master/deps/jscshim/docs/webkit_fork_and_compilation.md#webkit-port-and-compilation
> > Use the optimized assembly version of LLInt (JSC's interpreter), not
> cloop. This requires enabling JIT support, although we won't be using the
> JIT (but we can omit the FTL jit).
> I would like to know how fast LLInt ASM interpreter is when comparing
> CLoop interpreter.
> If it shows nice speedup, enabling LLInt ASM interpreter without JIT for
> major architectures (x64, ARM64) sounds nice.
> As a bonus, if we offer this build configuration (using LLInt ASM
> interpreter without JIT), we can enable SamplingProfiler for this, which is
> disabled for CLoop builds.
> Personally, I'm also interested in this thing. I'll set up the environment
> to measure it later too :)
>> Besides that, I will appreciate any opinions\ideas\insights\suggestions
>> :)
>> Koby
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