Object ID Ring with tests

runtime/vm/isolate.cc

Index: runtime/vm/isolate.cc
diff --git a/runtime/vm/isolate.cc b/runtime/vm/isolate.cc
index 14c2392cdaf4aa5329d4d8a20a14170a9ab50367..9e6189fd2109022defdde90301b10ecd2549b900 100644
--- a/runtime/vm/isolate.cc
+++ b/runtime/vm/isolate.cc
@@ -26,6 +26,7 @@
 #include "vm/thread.h"
 #include "vm/timer.h"
 #include "vm/visitor.h"
+#include "vm/object_id_ring.h"
 
 namespace dart {
 
@@ -415,6 +416,7 @@ Isolate::Isolate()
       stacktrace_(NULL),
       stack_frame_index_(-1),
       object_histogram_(NULL),
+      object_id_ring_(NULL),
       REUSABLE_HANDLE_LIST(REUSABLE_HANDLE_INITIALIZERS)
       reusable_handles_() {
   if (FLAG_print_object_histogram && (Dart::vm_isolate() != NULL)) {
@@ -1068,6 +1070,17 @@ char* Isolate::GetStatus(const char* request) {
 }
 
 
+void Isolate::set_object_id_ring(ObjectIdRing* ring) {
+  ASSERT(heap_ != NULL);
+  object_id_ring_ = ring;
+  if (ring == NULL) {
+    heap_->set_object_id_ring_table(NULL, 0);
+  } else {
+    heap_->set_object_id_ring_table(ring->table_, ring->capacity_);
+  }
+}
+
+
 template<class T>
 T* Isolate::AllocateReusableHandle() {
   T* handle = reinterpret_cast<T*>(reusable_handles_.AllocateScopedHandle());