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From "Changrui Yuan" <cyu...@uiuc.edu>
Subject Re: [drlvm][jitrino.jet]: Question about JFrame
Date Thu, 24 Jul 2008 14:48:02 GMT
  Thanks for your explanation, Xiao-feng. It's quite clear and helpful.

On Thu, Jul 24, 2008 at 4:45 PM, Xiao-Feng Li <xiaofeng.li@gmail.com> wrote:

> Changrui, in my understanding, the JFrame is not the real frame, it's
> the so-called mimic stack to facilitate the fast compilation. The real
> frame is still on the native stack following defined calling
> convention. JFrame is kind of a simulation Java frame to bookkeeping
> the Java frame status at compilation time. Native stack is the real
> runtime stack.
>
> Thanks,
> xiaofeng
>
> On Wed, Jul 23, 2008 at 2:14 PM, Changrui Yuan <yuancr@gmail.com> wrote:
> >    Hi, all. This is my first time to send an email to the mailing list.
> > Hope someone can help me. Thanks in advance.
> >    I am currently reading the source code about method invocation in
> > Harmony. I find the JET compiler maintains the operand stack and local
> array
> > in a structure called JFrame. If I push an immediate number to the
> operand
> > stack, the compiler can get this number from the operand stack later.
> When
> > there is a method invocation, the callee will create a new instance of
> > JFrame. Does this new JFrame have any connection with the caller's
> JFrame?
> > In some JVM implementation, the caller's operand stack becomes callee's
> > local array for arguments passing. But I cannot find this part in Harmony
> > source code. My current understanding is that these two JFrames are not
> > related. The arguments are pushed to the native stack for the callee to
> > access. My goal is that the caller pushes an immediate number to its
> operand
> > stack as an argument and later the callee can get this operand. If the
> > arguments are pushed into the native stack for passing, I don't know how
> the
> > callee can access this immediate number.
> >    I am really confused right now. Hope someone can help me. Thanks a
> lot!
> >
> >
> >   Best regards,
> >
> >
> >
> > Changrui
> >
>
>
>
> --
> http://xiao-feng.blogspot.com
>

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