Garbage collection questions

Couple of questions:

  1. void llvm_gc_write(void *V, void *ObjPtr, void **FieldPtr)

I haven’t seen an adequate explanation of these, but I’m guessing:
void *V: value being written to the field
void *ObjPtr: current value of the field (ie. ObjPtr == *FieldPtr upon entry to llvm_gc_write)
void **FieldPtr: address of the field being written

  1. The current semispace collector includes some code which says it should be in a code-generator library. If I were to write a collector, should I also include this code for the time being? Or will this soon be refactored into an external interface?

  2. void %llvm.gcroot(<ty>** %ptrloc, <ty2>* %metadata)

I don't see an implementation of the llvm.gcroot intrinsic in the semispace collector, so is it implemented elsewhere? Semispace has a function with the same signature, but it's not in the public GC interface ( [http://llvm.cs.uiuc.edu/cvsweb/cvsweb.cgi/llvm/runtime/GC/GCInterface.h](http://llvm.cs.uiuc.edu/cvsweb/cvsweb.cgi/llvm/runtime/GC/GCInterface.h)). Or is this simply because the ``llvm_cg_walk_gcroots callback hasn't been refactored as an external interface (as per ``#2 above)?

That's it for now. :-)

Sandro