Oilpan: Implement a GC to take a heap snapshot

Source/platform/heap/Heap.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 368 matching lines @@
     BasePage* next() const { return m_next; }
 
     // virtual methods are slow. So performance-sensitive methods
     // should be defined as non-virtual methods on NormalPage and LargeObjectPage.
     // The following methods are not performance-sensitive.
     virtual size_t objectPayloadSizeForTesting() = 0;
     virtual bool isEmpty() = 0;
     virtual void removeFromHeap() = 0;
     virtual void sweep() = 0;
     virtual void makeConsistentForGC() = 0;
+    virtual void makeConsistentForMutator() = 0;
 #if defined(ADDRESS_SANITIZER)
     virtual void poisonUnmarkedObjects() = 0;
 #endif
     // Check if the given address points to an object in this
     // heap page. If so, find the start of that object and mark it
     // using the given Visitor. Otherwise do nothing. The pointer must
     // be within the same aligned blinkPageSize as the this-pointer.
     //
     // This is used during conservative stack scanning to
     // conservatively mark all objects that could be referenced from
@@ skipping 67 matching lines @@
     bool containedInObjectPayload(Address address)
     {
         return payload() <= address && address < payloadEnd();
     }
 
     virtual size_t objectPayloadSizeForTesting() override;
     virtual bool isEmpty() override;
     virtual void removeFromHeap() override;
     virtual void sweep() override;
     virtual void makeConsistentForGC() override;
+    virtual void makeConsistentForMutator() override;
 #if defined(ADDRESS_SANITIZER)
     virtual void poisonUnmarkedObjects() override;
 #endif
     virtual void checkAndMarkPointer(Visitor*, Address) override;
     virtual void markOrphaned() override;
 #if ENABLE(GC_PROFILING)
     const GCInfo* findGCInfo(Address) override;
     void snapshot(TracedValue*, ThreadState::SnapshotInfo*) override;
     void incrementMarkedObjectsAge() override;
     void countMarkedObjects(ClassAgeCountsMap&) override;
@@ skipping 42 matching lines @@
     bool containedInObjectPayload(Address address)
     {
         return payload() <= address && address < payloadEnd();
     }
 
     virtual size_t objectPayloadSizeForTesting() override;
     virtual bool isEmpty() override;
     virtual void removeFromHeap() override;
     virtual void sweep() override;
     virtual void makeConsistentForGC() override;
+    virtual void makeConsistentForMutator() override;
 #if defined(ADDRESS_SANITIZER)
     virtual void poisonUnmarkedObjects() override;
 #endif
     virtual void checkAndMarkPointer(Visitor*, Address) override;
     virtual void markOrphaned() override;
 
 #if ENABLE(GC_PROFILING)
     const GCInfo* findGCInfo(Address) override;
     void snapshot(TracedValue*, ThreadState::SnapshotInfo*) override;
     void incrementMarkedObjectsAge() override;
@@ skipping 138 matching lines @@
     void snapshot(TracedValue*, ThreadState::SnapshotInfo*);
     virtual void snapshotFreeList(TracedValue&) { };
 
     void countMarkedObjects(ClassAgeCountsMap&) const;
     void countObjectsToSweep(ClassAgeCountsMap&) const;
     void incrementMarkedObjectsAge();
 #endif
 
     virtual void clearFreeLists() { }
     void makeConsistentForGC();
+    void makeConsistentForMutator();
 #if ENABLE(ASSERT)
     virtual bool isConsistentForGC() = 0;
 #endif
     size_t objectPayloadSizeForTesting();
     void prepareHeapForTermination();
     void prepareForSweep();
 #if defined(ADDRESS_SANITIZER)
     void poisonUnmarkedObjects();
 #endif
     Address lazySweep(size_t, size_t gcInfoIndex);
@@ skipping 590 matching lines @@
     size_t copySize = previousHeader->payloadSize();
     if (copySize > size)
         copySize = size;
     memcpy(address, previous, copySize);
     return address;
 }
 
 } // namespace blink
 
 #endif // Heap_h