Oilpan: Implement mark/sweep stats collection for free list profiler.

Source/platform/heap/ThreadState.h

 /*
  * Copyright (C) 2013 Google Inc. 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
@@ skipping 24 matching lines @@
 #include "platform/heap/AddressSanitizer.h"
 #include "public/platform/WebThread.h"
 #include "wtf/HashMap.h"
 #include "wtf/HashSet.h"
 #include "wtf/OwnPtr.h"
 #include "wtf/PassOwnPtr.h"
 #include "wtf/ThreadSpecific.h"
 #include "wtf/Threading.h"
 #include "wtf/ThreadingPrimitives.h"
 #include "wtf/Vector.h"
+#include "wtf/text/StringHash.h"
+#include "wtf/text/WTFString.h"
 
 namespace v8 {
 class Isolate;
 };
 
 namespace blink {
 
 class BaseHeap;
 class BaseHeapPage;
 class CallbackStack;
@@ skipping 129 matching lines @@
     InlineVectorBackingHeap,
     HashTableBackingHeap,
     FOR_EACH_TYPED_HEAP(TypedHeapEnumName)
     // Values used for iteration of heap segments.
     NumberOfHeaps,
 };
 
 #if ENABLE(GC_PROFILING)
 const size_t numberOfGenerationsToTrack = 8;
 const size_t maxHeapObjectAge = numberOfGenerationsToTrack - 1;
+
+struct AgeCounts {
+    int ages[numberOfGenerationsToTrack];
+    AgeCounts() { std::fill(ages, ages + numberOfGenerationsToTrack, 0); }
+};
+typedef HashMap<String, AgeCounts> ClassAgeCountsMap;
 #endif
 
 class PLATFORM_EXPORT ThreadState {
     WTF_MAKE_NONCOPYABLE(ThreadState);
 public:
     // When garbage collecting we need to know whether or not there
     // can be pointers to Blink GC managed objects on the stack for
     // each thread. When threads reach a safe point they record
     // whether or not they have pointers on the stack.
     enum StackState {
@@ skipping 322 matching lines @@
         // For i == 7, the count is the number of objects that survived at least 7 GCs.
         using GenerationCountsVector = Vector<int, numberOfGenerationsToTrack>;
         Vector<GenerationCountsVector> generations;
 
         explicit SnapshotInfo(ThreadState* state) : state(state), freeSize(0), pageCount(0) { }
 
         size_t getClassTag(const GCInfo*);
     };
 
     void snapshot();
+    void incrementMarkedObjectsAge();
 
     void snapshotFreeListIfNecessary();
+
+    void collectAndReportMarkSweepStats() const;
+    void reportMarkSweepStats(const char* statsName, const ClassAgeCountsMap&) const;
 #endif
 
     void pushWeakPointerCallback(void*, WeakPointerCallback);
     bool popAndInvokeWeakPointerCallback(Visitor*);
 
     size_t objectPayloadSizeForTesting();
 
     void postGCProcessing();
     void prepareHeapForTermination();
 
@@ skipping 200 matching lines @@
         m_locked = false;
     }
 
     MutexBase& m_mutex;
     bool m_locked;
 };
 
 } // namespace blink
 
 #endif // ThreadState_h