Good strategy for determining root set in C++

Hey guys,

Just joined this list recently.  I have been tinkering with a
conservative GC in C++ in order to learn some of the ins and outs as
well as experiment with some of the heap organizational strategies I
have been researching.  In any case, I have some issues with determining
the root set.  I have seen several different implementations which
attempt to use global statics to identify parts of the data segment and
a similar method for getting to the current stack frame.  My question is
this.  Are there any other methods for doing this without having to
resort to creating a more intrusive framework?  I would like this GC to
be plugged in to existing code, therefore, I really do not want to
refactor the existing code to use special calls to new, or force objects
to inherit from a common base.  I will probably take that approach
eventually, as I really do not want to end up overriding the global
new/delete in the long run.

But anyways, do you guys have any suggestions?  Or what would be a
"typical" way of going about doing this.

Thanks!

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Matthew W. Campbell
Research Software Engineer
Alion Science and Technology, BMH Operation
5365 Robin Hood Road, Suite 100
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(757) 857-5670 x287, Fax (757) 857-6781
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