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From "Mikhail Fursov" <mike.fur...@gmail.com>
Subject Re: Harmony+Eclipse and Scrapbook Pages
Date Fri, 20 Apr 2007 19:02:52 GMT
Yes, JIT mode and interpreter mode are different in class resolution

Here how it works:
With interpreter class resolution is initiated when the class is actually
needed: object of the class is created, a static field or a static
method is invoked. This is the same as SUN behaviour. (AFAIK they use
interpreter too)

With JIT we have eager resolution today: all classes referred in a method
(and all inlined methods!) are resolved during compilation time. AFAIK BEA
works  this way too. At least, I can write tests that demonstrate it. If a
method has multiple references to a class and its resolution fails JIT asks
again an again to resolve it. Moreover, if exception happened in classloader
- it can be lost.

Now I'm working on Lazy Resolution task and going to submit it to JIRA right
after JavaOne is finished (there are a lot of changes and regressions are
possible). After it's done JIT will be able to work in either eager or lazy
mode. And I hope most of the resolution related bugs will gone after it.

BTW did you tried the same scenario with BEA?

On 4/21/07, Ivan Popov <ivan.g.popov@gmail.com> wrote:
> Yes, in interpreter mode step works fine. I don't see second attempt
> to load class in classloader trace while step is performed.
> Is it possible that in JIT mode first invocation of a method of
> already loaded class may lead to compilation and attempt to load this
> class second time?
> Thanks.
> Ivan
> On 4/20/07, Eugene Ostrovsky <eugene.s.ostrovsky@gmail.com> wrote:
> > BTW everything works fine with harmony VM in interpreter mode (-Xint
> option)
> >
> > On 4/20/07, Tim Ellison <t.p.ellison@gmail.com> wrote:
> > >
> > > Ivan Popov wrote:
> > > > Thanks, Mikhail, It might be useful, but I dont know how to specify
> > > > options for VM running Scrapbook code, it is started automatically.
> > >
> > > Select the jpage page file and choose the properties option from the
> > > context menu (Alt+Enter), in there you can find a 'Scrapbook Runtime'
> > > page where you can specify the VM and options etc it will use.
> > >
> > > Tim
> > >
> > >
> >

Mikhail Fursov

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