Track live instance and allocation counts for classes

runtime/vm/scavenger.h

 // Copyright (c) 2012, 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_SCAVENGER_H_
 #define VM_SCAVENGER_H_
 
 #include "platform/assert.h"
 #include "platform/utils.h"
 #include "vm/flags.h"
@@ skipping 71 matching lines @@
     *end = to_->end();
   }
 
   // Returns true if the last scavenge had a promotion failure.
   bool HadPromotionFailure() {
     return had_promotion_failure_;
   }
 
   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_;
+  }
+
  private:
   // Ids for time and data records in Heap::GCStats.
   enum {
     // Time
     kVisitIsolateRoots = 0,
     kIterateStoreBuffers = 1,
     kProcessToSpace = 2,
     kIterateWeaks = 3,
     // Data
     kStoreBufferEntries = 0,
@@ skipping 63 matching lines @@
   uword survivor_end_;
 
   // All object are aligned to this value.
   uword object_alignment_;
 
   // Keep track whether a scavenge is currently running.
   bool scavenging_;
   // Keep track whether the scavenge had a promotion failure.
   bool had_promotion_failure_;
 
+  int64_t gc_time_micros_;
+  intptr_t collections_;
+
   friend class ScavengerVisitor;
   friend class ScavengerWeakVisitor;
 
   DISALLOW_COPY_AND_ASSIGN(Scavenger);
 };
 
 }  // namespace dart
 
 #endif  // VM_SCAVENGER_H_