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From "Geir Magnusson Jr." <ge...@apache.org>
Subject Re: GC Compatibility (was: Re: State of the World)
Date Sun, 15 May 2005 12:37:27 GMT
Digging out...

On May 9, 2005, at 4:08 PM, Steven Augart wrote:
> I'd like to take off on a tangent here.  At one point I had the naive
> idea that I could make Jikes RVM able to play nicely with GCJ.  What
> really quashed the idea was the issue of garbage collection -- GCC  
> is not
> designed to pass type information down to the lower levels of the
> compiler, so GCJ doesn't build a "gc map", which you need in order  
> to be
> use any GC other than a Boehm-style conservative non-copying  
> collector.
> In other words, GCJ is restricted to using a garbage collection that
> looks for any bit patterns in the data that might be pointers, and  
> it has
> to assume that all of them are pointers.  If I am mis-stating the
> problem, I would appreciate someone publicly correcting me.
> Further, I've heard (have not looked at it myself, nor am I  
> competent to
> do so) that it would be an enormous amount of work to retrofit GCC so
> that GCJ could build GC maps.

Would there be a general facility that would be useful for other  
languages?   Would that help amortize the work?  Do you know others  
that are interested?

Geir Magnusson Jr                                  +1-203-665-6437

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