Oilpan: Remove support for tracing off-heap HashSets.

Source/platform/heap/Visitor.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 19 matching lines @@
 
 #ifndef Visitor_h
 #define Visitor_h
 
 #include "platform/PlatformExport.h"
 #include "platform/heap/ThreadState.h"
 #include "wtf/Assertions.h"
 #include "wtf/Deque.h"
 #include "wtf/Forward.h"
 #include "wtf/HashMap.h"
-#include "wtf/HashSet.h"
 #include "wtf/HashTraits.h"
 #include "wtf/InstanceCounter.h"
-#include "wtf/LinkedHashSet.h"
-#include "wtf/ListHashSet.h"
 #include "wtf/OwnPtr.h"
 #include "wtf/RefPtr.h"
 #include "wtf/TypeTraits.h"
 #include "wtf/WeakPtr.h"
 #if ENABLE(GC_TRACING)
 #include "wtf/text/WTFString.h"
 #endif
 
 #ifndef NDEBUG
 #define DEBUG_ONLY(x) x
@@ skipping 236 matching lines @@
         const_cast<T&>(t).trace(this);
     }
 
     // The following trace methods are for off-heap collections.
     template<typename T, size_t inlineCapacity>
     void trace(const Vector<T, inlineCapacity>& vector)
     {
         OffHeapCollectionTraceTrait<Vector<T, inlineCapacity, WTF::DefaultAllocator> >::trace(this, vector);
     }
 
-    template<typename T, typename U, typename V>
-    void trace(const HashSet<T, U, V>& hashSet)
-    {
-        OffHeapCollectionTraceTrait<HashSet<T, U, V> >::trace(this, hashSet);
-    }
-
     template<typename T, size_t N>
     void trace(const Deque<T, N>& deque)
     {
         OffHeapCollectionTraceTrait<Deque<T, N> >::trace(this, deque);
     }
 
     template<typename T, typename U, typename V, typename W, typename X>
     void trace(const HashMap<T, U, V, W, X, WTF::DefaultAllocator>& map)
     {
         OffHeapCollectionTraceTrait<HashMap<T, U, V, W, X, WTF::DefaultAllocator> >::trace(this, map);
@@ skipping 121 matching lines @@
 private:
     template<typename T>
     static void handleWeakCell(Visitor* self, void* obj)
     {
         T** cell = reinterpret_cast<T**>(obj);
         if (*cell && !self->isAlive(*cell))
             *cell = 0;
     }
 };
 
-template<typename T, typename HashFunctions, typename Traits>
-struct OffHeapCollectionTraceTrait<WTF::HashSet<T, HashFunctions, Traits, WTF::DefaultAllocator> > {
-    typedef WTF::HashSet<T, HashFunctions, Traits, WTF::DefaultAllocator> HashSet;
-
-    static void trace(Visitor* visitor, const HashSet& set)
-    {
-        if (set.isEmpty())
-            return;
-        if (WTF::ShouldBeTraced<Traits>::value) {
-            HashSet& iterSet = const_cast<HashSet&>(set);
-            for (typename HashSet::iterator it = iterSet.begin(), end = iterSet.end(); it != end; ++it) {
-                const T& t = *it;
-                CollectionBackingTraceTrait<WTF::ShouldBeTraced<Traits>::value, Traits::weakHandlingFlag, WTF::WeakPointersActWeak, T, Traits>::trace(visitor, const_cast<T&>(t));
-            }
-        }
-        COMPILE_ASSERT(Traits::weakHandlingFlag == WTF::NoWeakHandlingInCollections, WeakOffHeapCollectionsConsideredDangerous0);
-    }
-};
-
 template<typename Key, typename Value, typename HashFunctions, typename KeyTraits, typename ValueTraits>
 struct OffHeapCollectionTraceTrait<WTF::HashMap<Key, Value, HashFunctions, KeyTraits, ValueTraits, WTF::DefaultAllocator> > {
     typedef WTF::HashMap<Key, Value, HashFunctions, KeyTraits, ValueTraits, WTF::DefaultAllocator> HashMap;
 
     static void trace(Visitor* visitor, const HashMap& map)
     {
         if (map.isEmpty())
             return;
         if (WTF::ShouldBeTraced<KeyTraits>::value || WTF::ShouldBeTraced<ValueTraits>::value) {
             HashMap& iterMap = const_cast<HashMap&>(map);
@@ skipping 206 matching lines @@
 struct GCInfoTrait {
     static const GCInfo* get()
     {
         return GCInfoAtBase<typename GetGarbageCollectedBase<T>::type>::get();
     }
 };
 
 }
 
 #endif