1 files changed, 14 insertions, 3 deletions

diff --git a/deps/v8/src/zone/zone.h b/deps/v8/src/zone/zone.h
index 6f863f27fd..5fcc25b350 100644
--- a/deps/v8/src/zone/zone.h
+++ b/deps/v8/src/zone/zone.h
@@ -9,8 +9,10 @@
 
 #include "src/base/hashmap.h"
 #include "src/base/logging.h"
+#include "src/base/threaded-list.h"
 #include "src/globals.h"
 #include "src/splay-tree.h"
+#include "src/utils.h"
 #include "src/zone/accounting-allocator.h"
 
 #ifndef ZONE_NAME
@@ -56,6 +58,10 @@ class V8_EXPORT_PRIVATE Zone final {
   // Seals the zone to prevent any further allocation.
   void Seal() { sealed_ = true; }
 
+  // Allows the zone to be safely reused. Releases the memory and fires zone
+  // destruction and creation events for the accounting allocator.
+  void ReleaseMemory();
+
   // Returns true if more memory has been allocated in zones than
   // the limit allows.
   bool excess_allocation() const {
@@ -69,6 +75,9 @@ class V8_EXPORT_PRIVATE Zone final {
   AccountingAllocator* allocator() const { return allocator_; }
 
  private:
+  // Deletes all objects and free all memory allocated in the Zone.
+  void DeleteAll();
+
   // All pointers returned from New() are 8-byte aligned.
   static const size_t kAlignmentInBytes = 8;
 
@@ -81,9 +90,6 @@ class V8_EXPORT_PRIVATE Zone final {
   // Report zone excess when allocation exceeds this limit.
   static const size_t kExcessLimit = 256 * MB;
 
-  // Deletes all objects and free all memory allocated in the Zone.
-  void DeleteAll();
-
   // The number of bytes allocated in this zone so far.
   size_t allocation_size_;
 
@@ -295,6 +301,11 @@ class ZoneList final {
 template <typename T>
 using ZonePtrList = ZoneList<T*>;
 
+// ZoneThreadedList is a special variant of the ThreadedList that can be put
+// into a Zone.
+template <typename T, typename TLTraits = base::ThreadedListTraits<T>>
+using ZoneThreadedList = base::ThreadedListBase<T, ZoneObject, TLTraits>;
+
 // A zone splay tree.  The config type parameter encapsulates the
 // different configurations of a concrete splay tree (see splay-tree.h).
 // The tree itself and all its elements are allocated in the Zone.