1 files changed, 20 insertions, 0 deletions
diff --git a/deps/v8/src/profile-generator-inl.h b/deps/v8/src/profile-generator-inl.h
index 88d6e87941..7a70b013bb 100644
--- a/deps/v8/src/profile-generator-inl.h
+++ b/deps/v8/src/profile-generator-inl.h
@@ -95,6 +95,26 @@ CodeEntry* ProfileGenerator::EntryForVMState(StateTag tag) {
 }
 
 
+uint64_t HeapObjectsMap::GetNthGcSubrootId(int delta) {
+  return kGcRootsFirstSubrootId + delta * kObjectIdStep;
+}
+
+
+HeapObject* V8HeapExplorer::GetNthGcSubrootObject(int delta) {
+  return reinterpret_cast<HeapObject*>(
+      reinterpret_cast<char*>(kFirstGcSubrootObject) +
+      delta * HeapObjectsMap::kObjectIdStep);
+}
+
+
+int V8HeapExplorer::GetGcSubrootOrder(HeapObject* subroot) {
+  return static_cast<int>(
+      (reinterpret_cast<char*>(subroot) -
+       reinterpret_cast<char*>(kFirstGcSubrootObject)) /
+      HeapObjectsMap::kObjectIdStep);
+}
+
+
 uint64_t HeapEntry::id() {
   union {
     Id stored_id;