Oilpan: GC profiling.

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 23 matching lines @@
 #include "platform/PlatformExport.h"
 #include "platform/heap/AddressSanitizer.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"
 
+#if ENABLE(GC_PROFILE_HEAP)
+#include "wtf/HashMap.h"
+#endif
+
 namespace blink {
 
 class BaseHeap;
 class BaseHeapPage;
 class FinalizedHeapObjectHeader;
 struct GCInfo;
 class HeapContainsCache;
 class HeapObjectHeader;
 class PageMemory;
 class PersistentNode;
@@ skipping 438 matching lines @@
     // real machine stack if there is one.
     void visitAsanFakeStackForPointer(Visitor*, Address);
 
     // Visit all persistents allocated on this thread.
     void visitPersistents(Visitor*);
 
     // Checks a given address and if a pointer into the oilpan heap marks
     // the object to which it points.
     bool checkAndMarkPointer(Visitor*, Address);
 
-#if ENABLE(GC_TRACING)
+#if ENABLE(GC_PROFILE_MARKING)
     const GCInfo* findGCInfo(Address);
     static const GCInfo* findGCInfoFromAllThreads(Address);
 #endif
 
+#if ENABLE(GC_PROFILE_HEAP)
+    struct SnapshotInfo {
+        ThreadState* state;
+
+        size_t liveSize;
+        size_t deadSize;
+        size_t freeSize;
+        size_t pageCount;
+
+        // Map from base-classes to a snapshot class-ids (used as index below).
+        HashMap<const GCInfo*, size_t> classTags;
+
+        // Map from class-id (index) to count.
+        Vector<int> liveCount;
+        Vector<int> deadCount;
+
+        // Map from class-id (index) to a vector of generation counts.
+        // For i < 7, the count is the number of objects that died after surviving |i| GCs.
+        // For i == 7, the count is the number of objects that survived at least 7 GCs.
+        Vector<Vector<int, 8> > generations;
+
+        explicit SnapshotInfo(ThreadState* state) : state(state), liveSize(0), deadSize(0), freeSize(0), pageCount(0) { }
+
+        size_t getClassTag(const GCInfo*);
+    };
+
+    void snapshot();
+#endif
+
     void pushWeakObjectPointerCallback(void*, WeakPointerCallback);
     bool popAndInvokeWeakPointerCallback(Visitor*);
 
     void getStats(HeapStats&);
     HeapStats& stats() { return m_stats; }
     HeapStats& statsAfterLastGC() { return m_statsAfterLastGC; }
 
     void setupHeapsForTermination();
 
 private:
@@ skipping 198 matching lines @@
     // HeapPage header. We use some of the bits to determine
     // whether the page is part of a terminting thread or
     // if the page is traced after being terminated (orphaned).
     uintptr_t m_terminating : 1;
     uintptr_t m_tracedAfterOrphaned : 1;
 };
 
 }
 
 #endif // ThreadState_h