From: Jason Roelofs <jameskilton@...>
Date: 2009-08-02T03:29:19+09:00
Subject: Re: Fwd: ruby_frame in 1.8 is what in 1.9?

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On Sat, Aug 1, 2009 at 10:19 AM, Mark Moseley <mark@fast-software.com>wrote:

> Jason Roelofs wrote:
> > So I have some C++ extension code that nicely uses ruby_frame->orig_func
> > and
> > ruby_frame->self to figure out the current status of the VM at a given
> > method call. Trying to port this to 1.9 is running into some issues,
> > mainly
> > that I can't find a replacement for ruby_frame->self. I've found
> > rb_frame_callee() to replace ruby_frame->orig_func but cannot find out
> > how
> > to get access to the current Ruby "self" object for the call.
> >
> > Jason
>
> My best guess: try GET_THREAD()->cfp->self. That's probably not going to
> work, because the variables inside the frame are all different. I'd have
> to see what you need to do with the "self" object.
> --
> Posted via http://www.ruby-forum.com/.
>
>
I'll take a look at ruby_debug for sure, but for more information, here's
what I'm up against:

http://github.com/jameskilton/rice/blob/master/rice/Director.cpp

With tests to show example usage:

http://github.com/jameskilton/rice/blob/master/test/test_Director.cpp

If you're familiar with SWIG's %director, this is what I've got. This class
gets subclassed and helps define an intermediary between C++ and Ruby to
allow polymorphism and super calls to work seemlessly across the two
languages. What's there works great for 1.8, and it's best shown how it
works in the test:

int process(int num) {
  if(callIsFromRuby("process")) {
     raisePureVirtual();
  } else {
    return from_ruby<int>( getSelf().call("process", num) );
  }
}

So for 1.9 I need to figure out the current self object of the frame,
along with the name of the function currently being called, aka, how
do I port this line of code to work with 1.9?

return (getSelf().value() == ruby_frame->self) && (
rb_id2name(ruby_frame->orig_func) != methodName );

Thanks.

Jason

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