Just-in-time Compiler in JavaScriptCore (WebKit)

Part 3: Introducing the JavaScript interpreter, DFG JIT and FTL JIT from WebKit in this third part. To do that we use the debug version of JSC again and use environment variables to print useful debug output.

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[nikoshalk]

Thank you for the video! Clearing the air all around javascript and how it works under the hood is really interesting

[EvilSapphireR]

This turned out to be pretty theoretical. I need to brush up on how JIT compiling in general works to wrap my head fully around this.

[ZelenoJabko]

Hans, I love you. You have a gift of explaining everything so well everyone understands!

[SkrekkLich]

Really interesting. Thank you very much! Can't wait for the next video!

[TobyAsE]

I've never seen JS as a real and serious language. Something to use in browsers to spice up the webpage I'm working on. The "real" and interesting compiler-stuff is reserved for "real" languages like C or even python. I never thought about how JS gets executed and that all of this optimization-stuff is used - after all it's just used to spice up webpages.
Thank you for getting me closer to this topic, my view of JS is changing and I am excited for the rest of the series.

[centdemeern]

This video is just in time for my break.

[sontapaajokulainen]

7:03 Why is there +0x8 after rsi? (I am assuming that rsi is a pointer ro the start of the array so shouldn't it already point at the first element?)

[Byamarro]

It would be nice to see video like this but about V8, since Safari is rather niche.

[VaradMahashabde]

Could there be attacks on the butterfly of a function, changing it to one that of a _completely innocent_ string

[dasten]

the thing with clobberWorld() was very confusing :( I did not understand what you said at all. Who is calling that? When? So this is a marker for not optimizing certain functions, which is hardcoded for, for example String.valueOf ? huh? Why is that function harmful to optimize? What about user defined functions, are they always optimized? ... sorry I think I don't belong here :|

[awesmeness]

Is there a way to decompile (c++ written) dll/exe? Or atleast know what are they doing/changing?

[omri]

7:20 Javascript doesn't have doubles. Only floats, bigints and typed arrays.

[florian]

Recommend:
If water was made of sponge

[gizmoriderfulye]

Your channel is my new favorite. How about testing some keygens or game cracks?

[creeper]

*I pronounce jit as git*
Thats how jif sounds for us

[firefish]

Hello LiveOverflow!
I really tried to be first this time. Sorry for being a bit late.

[adamnshame]

I find this so sad. Such a complex system written by some incredible people... all to run the abomination that is JavaScript.

[OmarMohamed-ynzy]

1 view
2 likes
*YouTube is drunk again*