1 files changed, 39 insertions, 0 deletions
diff --git a/src/js_native_api_v8_internals.h b/src/js_native_api_v8_internals.h
index ddd219818c..74afd1172e 100644
--- a/src/js_native_api_v8_internals.h
+++ b/src/js_native_api_v8_internals.h
@@ -28,6 +28,45 @@
 
 namespace v8impl {
 
+class RefTracker {
+ public:
+  RefTracker() {}
+  virtual ~RefTracker() {}
+  virtual void Finalize(bool isEnvTeardown) {}
+
+  typedef RefTracker RefList;
+
+  inline void Link(RefList* list) {
+    prev_ = list;
+    next_ = list->next_;
+    if (next_ != nullptr) {
+      next_->prev_ = this;
+    }
+    list->next_ = this;
+  }
+
+  inline void Unlink() {
+    if (prev_ != nullptr) {
+      prev_->next_ = next_;
+    }
+    if (next_ != nullptr) {
+      next_->prev_ = prev_;
+    }
+    prev_ = nullptr;
+    next_ = nullptr;
+  }
+
+  static void FinalizeAll(RefList* list) {
+    while (list->next_ != nullptr) {
+      list->next_->Finalize(true);
+    }
+  }
+
+ private:
+  RefList* next_ = nullptr;
+  RefList* prev_ = nullptr;
+};
+
 template <typename T>
 using Persistent = v8::Global<T>;