Track live instance and allocation counts for classes

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"
 
 namespace dart {
 
 DECLARE_FLAG(bool, collect_code);
 DECLARE_FLAG(bool, log_code_drop);
 DECLARE_FLAG(bool, always_drop_code);
 
 // Forward declarations.
 class Heap;
+class JSONObject;
 class ObjectPointerVisitor;
 
 // A page containing old generation objects.
 class HeapPage {
  public:
   enum PageType {
     kData = 0,
     kExecutable,
     kNumPageTypes
   };
@@ skipping 182 matching lines @@
   void SetGrowthControlState(bool state) {
     page_space_controller_.set_is_enabled(state);
   }
 
   bool GrowthControlState() {
     return page_space_controller_.is_enabled();
   }
 
   void WriteProtect(bool read_only);
 
+  void AddGCTime(int64_t micros) {
+    gc_time_micros_ += micros;
+  }
+
+  int64_t gc_time_micros() const {
+    return gc_time_micros_;
+  }
+
+  void IncrementCollections() {
+    collections_++;
+  }
+
+  intptr_t collections() const {
+    return collections_;
+  }
+
+  void PrintToJSONObject(JSONObject* object);
+
  private:
   // Ids for time and data records in Heap::GCStats.
   enum {
     // Time
     kMarkObjects = 0,
     kResetFreeLists = 1,
     kSweepPages = 2,
     kSweepLargePages = 3,
     // Data
     kGarbageRatio = 0,
@@ skipping 28 matching lines @@
   // Various sizes being tracked for this generation.
   intptr_t max_capacity_in_words_;
   intptr_t capacity_in_words_;
   intptr_t used_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_