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From liaoyin <ustcl...@gmail.com>
Subject Re: [drlvm]what is "jlc"
Date Tue, 08 Apr 2008 09:06:05 GMT
thank you very much.

2008/4/8, Xiao-Feng Li <xiaofeng.li@gmail.com>:
>
> Lyon, please ignore the function trace_forwarded_gen_jlC_from_vtable.
> They should be removed. It was an old design with weakroot and class
> unloading.
>
> To explain what it does, I should mention what weakroot is. Weakroot
> is some root references that are not considered to be used for
> liveness (reachability) identification. That is, the objects only
> pointed by weakroots are not live. We need know them in GC. When an
> live object also pointed to by a weakroot is moved by GC, we need
> update the weakroot to point to the new location.
>
> When an object (JLC instance) is not pointed to by any live objects,
> it may still have object instances. The instance object has pointer to
> Vtable, and the Vtable has pointer to the JLC instance. That means, it
> is still in use. We need find them and move them accordingly in
> collection.
>
> Anyway, please ignore the code guarded with TRACE_JLC_VIA_VTABLE
> condition, unless you really hit some problem with them.
>
> Thanks,
> xiaofeng
>
>
> On Tue, Apr 8, 2008 at 4:07 PM, lyon <ustcliao@gmail.com> wrote:
> > hi everyone
> >
> >  I am reading the gc src.I don't understand what is "jlc" that is member
> >  var of the vtable.there are two functions "forward_jlc_instance" and
> >  "trace_forwarded_gen_jlC_from_vtable" in the \gc_gen\src\trace_forward.
> >
> >  What do the fuctions mean?
> >  thank you.
> >
>
>
>
>
> --
> http://xiao-feng.blogspot.com
>

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