[Interest] QML compiler?

Harri Pasanen harri at mpaja.com
Wed Jun 13 22:50:29 CEST 2012

Can the V8 state be dumped on disk?  If yes, it could do like python, 
compile the first run on target and dump the result for subsequent 
runs.  (Although python bytecode is machine independent).

I'm not familiar with QML inner workings though, especially where does 
the split with C++ and javascript happen.  Is all of QML compiled so 
some Javascript object model that has hooks to call to C++ and back?   
Is there some technical paper online which would have an overview?


On 06/13/2012 10:33 PM, Jason H wrote:
> I thought he V8 engine (which is used in Qt5) would have that feature 
> already, since it gets a lot of performance by whole-method compiling 
> the JS. However my understanding is the output of V8 is machine code, 
> and therefore, not portable. And therefore, you'd need an intermediate 
> layer, and how much slower is that intermediate layer than raw text? 
> I'm guessing it's not worth it.
> ------------------------------------------------------------------------
> *From:* Thiago Macieira <thiago.macieira at intel.com>
> *To:* interest at qt-project.org
> *Sent:* Wednesday, June 13, 2012 4:21 PM
> *Subject:* Re: [Interest] QML compiler?
> On quarta-feira, 13 de junho de 2012 22.03.22, Harri Pasanen wrote:
> > I started working on a bit more substantial QML application for symbian
> > and ran into some issues.  One of these is the startup time with 10+ QML
> > non trivial files, and I'm not finished adding them.
> >
> > Has there ever been thought for a bytecode compiler, that would store a
> > pre-parsed representation of QML?  Similar to whats what python does
> > with its .pyc files.
> Yes, thought was given to that.
> It doesn't exist yet.
> -- 
> Thiago Macieira - thiago.macieira (AT) intel.com <http://intel.com>
>   Software Architect - Intel Open Source Technology Center
>     Intel Sweden AB - Registration Number: 556189-6027
>     Knarrarnäsgatan 15, 164 40 Kista, Stockholm, Sweden
> _______________________________________________
> Interest mailing list
> Interest at qt-project.org <mailto:Interest at qt-project.org>
> http://lists.qt-project.org/mailman/listinfo/interest
> _______________________________________________
> Interest mailing list
> Interest at qt-project.org
> http://lists.qt-project.org/mailman/listinfo/interest

More information about the Interest mailing list