Track external allocated memory for weak persistent handles.

runtime/vm/pages.h

 // Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef VM_PAGES_H_
 #define VM_PAGES_H_
 
 #include "vm/freelist.h"
 #include "vm/globals.h"
 #include "vm/virtual_memory.h"
@@ skipping 170 matching lines @@
 
   PageSpace(Heap* heap, intptr_t max_capacity_in_words);
   ~PageSpace();
 
   uword TryAllocate(intptr_t size,
                     HeapPage::PageType type = HeapPage::kData,
                     GrowthPolicy growth_policy = kControlGrowth);
 
   intptr_t UsedInWords() const { return used_in_words_; }
   intptr_t CapacityInWords() const { return capacity_in_words_; }
+  intptr_t ExternalInWords() const {
+    return external_in_words_;
+  }
 
   bool Contains(uword addr) const;
   bool Contains(uword addr, HeapPage::PageType type) const;
   bool IsValidAddress(uword addr) const {
     return Contains(addr);
   }
 
   void VisitObjects(ObjectVisitor* visitor) const;
   void VisitObjectPointers(ObjectPointerVisitor* visitor) const;
 
@@ skipping 30 matching lines @@
   void IncrementCollections() {
     collections_++;
   }
 
   intptr_t collections() const {
     return collections_;
   }
 
   void PrintToJSONObject(JSONObject* object);
 
+  void AllocateExternal(intptr_t size);
+  void FreeExternal(intptr_t size);
+
  private:
   // Ids for time and data records in Heap::GCStats.
   enum {
     // Time
     kMarkObjects = 0,
     kResetFreeLists = 1,
     kSweepPages = 2,
     kSweepLargePages = 3,
     // Data
     kGarbageRatio = 0,
@@ skipping 22 matching lines @@
   Heap* heap_;
 
   HeapPage* pages_;
   HeapPage* pages_tail_;
   HeapPage* large_pages_;
 
   // Various sizes being tracked for this generation.
   intptr_t max_capacity_in_words_;
   intptr_t capacity_in_words_;
   intptr_t used_in_words_;
+  intptr_t external_in_words_;
 
   // Keep track whether a MarkSweep is currently running.
   bool sweeping_;
 
   PageSpaceController page_space_controller_;
 
   int64_t gc_time_micros_;
   intptr_t collections_;
 
   friend class PageSpaceController;
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(PageSpace);
 };
 
 }  // namespace dart
 
 #endif  // VM_PAGES_H_