[Bug libgcj/18266] SIGSEGV in GC_register_finalizer_inner ()

["ovidr at users dot sourceforge dot net" <gcc-bugzilla at gcc dot gnu dot org>]

------- Additional Comments From ovidr at users dot sourceforge dot net  2005-06-20 16:25 -------
I've tried to create a testcase but can't seem to get a crash or infinite loop 
lockup.

Anyway, I think I understand conceptually what must be done, but in practice 
I'm still unsure of how to go about it. You don't seem to have a problem with 
the call to: 

_Jv_RegisterFinalizer (this, finalize_reference);

only

_Jv_RegisterFinalizer (referent, finalize_referred_to_object);

but since referent is an arbitrary object, what kind of finalizers can it 
already have? I'm stumped on how to get access to an arbitrary object's 
finalizers from natReference.cc.  Is it just the heavy_lock structure from 
natObject that needs to be considered somehow? 

>From comment #10:
"My impression is that natReference.cc already keeps a fairly elaborate data
structure to which you should be able to add the prior finalization info"

This is the part that confuses me. Not all objects are References, so how would 
a Reference know about some arbitrary Object's previous finalizers or even 
attempt to maintain a data structure? 

And once I have the Object's old finalizer (if there is one), I guess I just 
run it, and register the new one with
"GC_REGISTER_FINALIZER_NO_ORDER(x, x, cd, 0, 0);"
from natReference's  "finalize_referred_to_object" ?  

Or am I way off track?

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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18266