Track live instance and allocation counts for classes

runtime/vm/heap.h

Index: runtime/vm/heap.h
diff --git a/runtime/vm/heap.h b/runtime/vm/heap.h
index 2c39e2bde63f09447ed846d62bd6f2715ca3a382..aa4649bb30da0a4d472e85f11f985610d59872e2 100644
--- a/runtime/vm/heap.h
+++ b/runtime/vm/heap.h
@@ -165,7 +165,10 @@ class Heap {
   // Return amount of memory used and capacity in a space.
   intptr_t UsedInWords(Space space) const;
   intptr_t CapacityInWords(Space space) const;
-
+  // Return the amount of GCing in microseconds.
+  int64_t GCTimeInMicros(Space space) const;
+  double GCTimeInSeconds(Space space) const;

[Ivan Posva, 2014/01/17 06:53:16]

Why do you need both? Micros and Seconds?

[Cutch, 2014/01/17 18:37:59]

Removed Seconds.

+  intptr_t Collections(Space space) const;
   // Returns the [lowest, highest) addresses in the heap.
   void StartEndAddress(uword* start, uword* end) const;
 
@@ -278,6 +281,7 @@ class Heap {
   void RecordAfterGC();
   void PrintStats();
   void UpdateObjectHistogram();
+  void UpdateClassHeapStatsBeforeGC(Heap::Space space);
 
   // The different spaces used for allocation.
   Scavenger* new_space_;