gc question

[law@redhat.com]

In message <827C18A4-1C61-11D8-9E98-000A95DA505C@dberlin.org>, Daniel Berlin wr
ites:
 >
 >On Nov 21, 2003, at 3:26 PM, law@redhat.com wrote:
 >
 >>
 >> So lets say I wanted to like show me every GC allocation of a 
 >> particular
 >> type which is still active at time X?
 >>
 >> For example, I'd like to verify that if we GC after we leave the 
 >> tree-ssa
 >> path that every SSA_NAME and every PHI is collected.  Or slightly more
 >> ambitious that every varray used by the SSA optimizers is gone.
 >>
 >> Any chance of doing that?  Hints?
 >>
 >
 >I have a collector that is based on the zone collector that can do 
 >this, because it marks each allocation with the typecode (by having a 
 >ton of different ggc_alloc macros).
 >
 >Other than that, you probably can't do this easily.
I don't mind doing some post-processing, or hacking into the allocator to
do something like build a hash table of things I care about, invalidating
them if they're released, etc etc.

Basically I want to accomplish two things.  First, nodes that I know should
have been collected were actually collected.  Second, I'm seeing some odd
stuff with varrays which makes me wonder if somewhere, somehow we're 
holding on to some pointers to them and not collecting the varrays.

jeff