Pool implementation for zone segments

src/isolate.cc

Index: src/isolate.cc
diff --git a/src/isolate.cc b/src/isolate.cc
index cfb6860d978b1566005f430d7854bd224dc8e9bb..c3e5eb6b3771c8a32ddbbccd465c44e22d94e2b6 100644
--- a/src/isolate.cc
+++ b/src/isolate.cc
@@ -1933,8 +1933,8 @@ class VerboseAccountingAllocator : public AccountingAllocator {
   VerboseAccountingAllocator(Heap* heap, size_t sample_bytes)
       : heap_(heap), last_memory_usage_(0), sample_bytes_(sample_bytes) {}
 
-  v8::internal::Segment* AllocateSegment(size_t size) override {
-    v8::internal::Segment* memory = AccountingAllocator::AllocateSegment(size);
+  v8::internal::Segment* GetSegment(size_t size) override {
+    v8::internal::Segment* memory = AccountingAllocator::GetSegment(size);
     if (memory) {
       size_t current = GetCurrentMemoryUsage();
       if (last_memory_usage_.Value() + sample_bytes_ < current) {
@@ -1945,8 +1945,8 @@ class VerboseAccountingAllocator : public AccountingAllocator {
     return memory;
   }
 
-  void FreeSegment(v8::internal::Segment* memory) override {
-    AccountingAllocator::FreeSegment(memory);
+  void ReturnSegment(v8::internal::Segment* memory) override {
+    AccountingAllocator::ReturnSegment(memory);
     size_t current = GetCurrentMemoryUsage();
     if (current + sample_bytes_ < last_memory_usage_.Value()) {
       PrintJSON(current);
@@ -2002,7 +2002,6 @@ Isolate::Isolate(bool enable_serializer)
       allocator_(FLAG_trace_gc_object_stats
                      ? new VerboseAccountingAllocator(&heap_, 256 * KB)
                      : new AccountingAllocator()),
-      runtime_zone_(new Zone(allocator_)),
       inner_pointer_to_code_cache_(NULL),
       global_handles_(NULL),
       eternal_handles_(NULL),
@@ -2197,9 +2196,6 @@ void Isolate::SetIsolateThreadLocals(Isolate* isolate,
 Isolate::~Isolate() {
   TRACE_ISOLATE(destructor);
 
-  // Has to be called while counters_ are still alive
-  runtime_zone_->DeleteKeptSegment();
-
   // The entry stack must be empty when we get here.
   DCHECK(entry_stack_ == NULL || entry_stack_->previous_item == NULL);
 
@@ -2276,9 +2272,6 @@ Isolate::~Isolate() {
   delete cancelable_task_manager_;
   cancelable_task_manager_ = nullptr;
 
-  delete runtime_zone_;
-  runtime_zone_ = nullptr;
-
   delete allocator_;
   allocator_ = nullptr;