Add counters that automatically track object sizes and counts.

src/mark-compact.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 926 matching lines @@
   return HeapObject::cast(first);
 }
 
 
 class StaticMarkingVisitor : public StaticVisitorBase {
  public:
   static inline void IterateBody(Map* map, HeapObject* obj) {
     table_.GetVisitor(map)(map, obj);
   }
 
+  template<int id>
+  class ObjectStatsTracker {
+   public:
+    static inline void Visit(Map* map, HeapObject* obj) {
+      Heap* heap = map->GetHeap();
+      int object_size = obj->Size();
+      heap->RecordObjectStats(map->instance_type(), object_size);
+      non_count_table_.GetVisitorById(static_cast<VisitorId>(id))(map, obj);
+    }
+  };
+
   static void Initialize() {
     table_.Register(kVisitShortcutCandidate,
                     &FixedBodyVisitor<StaticMarkingVisitor,
                                       ConsString::BodyDescriptor,
                                       void>::Visit);
 
     table_.Register(kVisitConsString,
                     &FixedBodyVisitor<StaticMarkingVisitor,
                                       ConsString::BodyDescriptor,
                                       void>::Visit);
@@ skipping 48 matching lines @@
                                    kVisitDataObject,
                                    kVisitDataObjectGeneric>();
 
     table_.RegisterSpecializations<JSObjectVisitor,
                                    kVisitJSObject,
                                    kVisitJSObjectGeneric>();
 
     table_.RegisterSpecializations<StructObjectVisitor,
                                    kVisitStruct,
                                    kVisitStructGeneric>();
+
+    if (FLAG_track_gc_object_stats) {
+      // Copy the visitor table to make call-through possible.
+      non_count_table_.CopyFrom(&table_);
+#define VISITOR_ID_COUNT_FUNCTION(id)\
+      table_.Register(kVisit##id, ObjectStatsTracker<kVisit##id>::Visit);
+      VISITOR_ID_LIST(VISITOR_ID_COUNT_FUNCTION)
+#undef VISITOR_ID_COUNT_FUNCTION
+    }
   }
 
   INLINE(static void VisitPointer(Heap* heap, Object** p)) {
     MarkObjectByPointer(heap->mark_compact_collector(), p, p);
   }
 
   INLINE(static void VisitPointers(Heap* heap, Object** start, Object** end)) {
     // Mark all objects pointed to in [start, end).
     const int kMinRangeForMarkingRecursion = 64;
     if (end - start >= kMinRangeForMarkingRecursion) {
@@ skipping 525 matching lines @@
     VisitPointers(heap,
         SLOT_ADDR(object, SharedFunctionInfo::kOptimizedCodeMapOffset),
         SLOT_ADDR(object, SharedFunctionInfo::kSize));
   }
 
   #undef SLOT_ADDR
 
   typedef void (*Callback)(Map* map, HeapObject* object);
 
   static VisitorDispatchTable<Callback> table_;
+  static VisitorDispatchTable<Callback> non_count_table_;
 };
 
 
 VisitorDispatchTable<StaticMarkingVisitor::Callback>
   StaticMarkingVisitor::table_;
+VisitorDispatchTable<StaticMarkingVisitor::Callback>
+  StaticMarkingVisitor::non_count_table_;
 
 
 class MarkingVisitor : public ObjectVisitor {
  public:
   explicit MarkingVisitor(Heap* heap) : heap_(heap) { }
 
   void VisitPointer(Object** p) {
     StaticMarkingVisitor::VisitPointer(heap_, p);
   }
 
@@ skipping 855 matching lines @@
 
   // Flush code from collected candidates.
   if (is_code_flushing_enabled()) {
     code_flusher_->ProcessCandidates();
   }
 
   if (!FLAG_watch_ic_patching) {
     // Clean up dead objects from the runtime profiler.
     heap()->isolate()->runtime_profiler()->RemoveDeadSamples();
   }
+
+  if (FLAG_track_gc_object_stats) {
+    heap()->CheckpointObjectStats();
+  }
 }
 
 
 void MarkCompactCollector::ProcessMapCaches() {
   Object* raw_context = heap()->global_contexts_list_;
   while (raw_context != heap()->undefined_value()) {
     Context* context = reinterpret_cast<Context*>(raw_context);
     if (IsMarked(context)) {
       HeapObject* raw_map_cache =
           HeapObject::cast(context->get(Context::MAP_CACHE_INDEX));
@@ skipping 1706 matching lines @@
   while (buffer != NULL) {
     SlotsBuffer* next_buffer = buffer->next();
     DeallocateBuffer(buffer);
     buffer = next_buffer;
   }
   *buffer_address = NULL;
 }
 
 
 } }  // namespace v8::internal