Track live instance and allocation counts for classes

runtime/vm/class_table.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_CLASS_TABLE_H_
 #define VM_CLASS_TABLE_H_
 
 #include "platform/assert.h"
 #include "vm/globals.h"
 
 namespace dart {
 
 class Class;
+class ClassStats;
 class ObjectPointerVisitor;
 class RawClass;
 class JSONStream;
 
+class ClassHeapStats {
+ public:
+  intptr_t live_count_old_space;
+  intptr_t live_count_new_space;
+  intptr_t live_size_old_space;
+  intptr_t live_size_new_space;
+
+  // These fields are updated by generated code:
+  intptr_t new_count_since_gc_new_space;
+  intptr_t new_count_since_gc_old_space;
+  intptr_t new_size_since_gc_new_space;
+  intptr_t new_size_since_gc_old_space;
+
+  static intptr_t new_count_since_gc_new_space_offset() {
+    return OFFSET_OF(ClassHeapStats, new_count_since_gc_new_space);
+  }
+  static intptr_t new_count_since_gc_old_space_offset() {
+    return OFFSET_OF(ClassHeapStats, new_count_since_gc_old_space);
+  }
+  static intptr_t new_size_since_gc_new_space_offset() {
+    return OFFSET_OF(ClassHeapStats, new_size_since_gc_new_space);
+  }
+  static intptr_t new_size_since_gc_old_space_offset() {
+    return OFFSET_OF(ClassHeapStats, new_size_since_gc_old_space);
+  }
+
+  void Initialize();
+  void ResetAtGC();
+};
+
+
 class ClassTable {
  public:
   ClassTable();
   ~ClassTable();
 
   RawClass* At(intptr_t index) const {
     ASSERT(IsValidIndex(index));
     return table_[index];
   }
 
   intptr_t IsValidIndex(intptr_t index) const {
     return (index > 0) && (index < top_);
   }
 
   bool HasValidClassAt(intptr_t index) const {
     ASSERT(IsValidIndex(index));
     return table_[index] != NULL;
   }
 
   intptr_t NumCids() const { return top_; }
 
   void Register(const Class& cls);
 
   void VisitObjectPointers(ObjectPointerVisitor* visitor);
 
   void Print();
 
   void PrintToJSONStream(JSONStream* stream);
 
   static intptr_t table_offset() {

[Ivan Posva, 2013/12/12 13:53:24]

Why are we using the offset of the field here and the address of the field
below?

[Cutch, 2013/12/13 01:31:09]

This function table_offset() is used by the assembler in LoadClass and
LoadClassById. I'm not using it.

     return OFFSET_OF(ClassTable, table_);
   }
 
+  // Called whenever a class is allocated in the runtime.
+  void ReportAllocationNewSpace(intptr_t cid, intptr_t size);
+  void ReportAllocationOldSpace(intptr_t cid, intptr_t size);
+
+  // Called whenever a major GC occurs.
+  void Collect();
+
+  // Used by the generated code.
+  uword PredefinedClassHeapStatsTableAddress() {
+    return reinterpret_cast<uword>(predefined_class_heap_stats_table_);
+  }
+
+  // Used by generated code.
+  uword ClassStatsTableAddress() {
+    return reinterpret_cast<uword>(&class_heap_stats_table_);
+  }
+
  private:
+  friend class MarkingVisitor;
   static const int initial_capacity_ = 512;
   static const int capacity_increment_ = 256;
 
+  static bool CollectInstanceSizesForClass(intptr_t cid);
+
   intptr_t top_;
   intptr_t capacity_;
 
   RawClass** table_;
+  ClassHeapStats* class_heap_stats_table_;
+
+  ClassHeapStats* predefined_class_heap_stats_table_;
+
+  ClassHeapStats* FindClassHeapStats(intptr_t cid);
+  void ResetCounters();
+  void ReportLiveOldSpace(intptr_t cid, intptr_t size);
+  void ReportLiveNewSpace(intptr_t cid, intptr_t size);
 
   DISALLOW_COPY_AND_ASSIGN(ClassTable);
 };
 
 }  // namespace dart
 
 #endif  // VM_CLASS_TABLE_H_