Oilpan: remove consts when checking GC-class convertibility.

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 112 matching lines @@
 
 // The FinalizerTrait is used to determine if a type requires
 // finalization and what finalization means.
 //
 // By default classes that inherit from GarbageCollectedFinalized need
 // finalization and finalization means calling the 'finalize' method
 // of the object. The FinalizerTrait can be specialized if the default
 // behavior is not desired.
 template<typename T>
 struct FinalizerTrait {
-    static const bool nonTrivialFinalizer = WTF::IsSubclassOfTemplate<T, GarbageCollectedFinalized>::value;
+    static const bool nonTrivialFinalizer = WTF::IsSubclassOfTemplate<typename WTF::RemoveConst<T>::Type, GarbageCollectedFinalized>::value;
     static void finalize(void* obj) { FinalizerTraitImpl<T, nonTrivialFinalizer>::finalize(obj); }
 };
 
 // The VTableTrait is used to determine if a type has at least one virtual method.
 template<typename T>
 struct VTableTrait {
     static const bool hasVTable = __is_polymorphic(T);
 };
 
 // Trait to get the GCInfo structure for types that have their
 // instances allocated in the Blink garbage-collected heap.
 template<typename T> struct GCInfoTrait;
 
 template<typename T> class GarbageCollected;
 class GarbageCollectedMixin;
-template<typename T, bool = WTF::IsSubclassOfTemplate<T, GarbageCollected>::value> class NeedsAdjustAndMark;
+template<typename T, bool = WTF::IsSubclassOfTemplate<typename WTF::RemoveConst<T>::Type, GarbageCollected>::value> class NeedsAdjustAndMark;
 
 template<typename T>
 class NeedsAdjustAndMark<T, true> {
 public:
     static const bool value = false;
 };
 
 template<typename T>
 class NeedsAdjustAndMark<T, false> {
 public:
-    static const bool value = WTF::IsSubclass<T, GarbageCollectedMixin>::value;
+    static const bool value = WTF::IsSubclass<typename WTF::RemoveConst<T>::Type, GarbageCollectedMixin>::value;
 };
 
 template<typename T, bool = NeedsAdjustAndMark<T>::value> class DefaultTraceTrait;
 
 // The TraceTrait is used to specify how to mark an object pointer and
 // how to trace all of the pointers in the object.
 //
 // By default, the 'trace' method implemented on an object itself is
 // used to trace the pointers to other heap objects inside the object.
 //
@@ skipping 491 matching lines @@
 class GarbageCollectedMixin {
 public:
     virtual void adjustAndMark(Visitor*) const = 0;
     virtual bool isAlive(Visitor*) const = 0;
 };
 
 #define USING_GARBAGE_COLLECTED_MIXIN(TYPE) \
 public: \
     virtual void adjustAndMark(WebCore::Visitor* visitor) const OVERRIDE    \
     { \
-        typedef WTF::IsSubclassOfTemplate<TYPE, WebCore::GarbageCollected> IsSubclassOfGarbageCollected; \
+        typedef WTF::IsSubclassOfTemplate<typename WTF::RemoveConst<TYPE>::Type, WebCore::GarbageCollected> IsSubclassOfGarbageCollected; \
         COMPILE_ASSERT(IsSubclassOfGarbageCollected::value, OnlyGarbageCollectedObjectsCanHaveGarbageCollectedMixins); \
         visitor->mark(this, &WebCore::TraceTrait<TYPE>::trace); \
     } \
     virtual bool isAlive(WebCore::Visitor* visitor) const OVERRIDE  \
     { \
         return visitor->isAlive(this); \
     }
 
 #if ENABLE(OILPAN)
 #define WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(TYPE) USING_GARBAGE_COLLECTED_MIXIN(TYPE)
@@ skipping 23 matching lines @@
             VTableTrait<T>::hasVTable,
 #if ENABLE(GC_TRACING)
             TypenameStringTrait<T>::get()
 #endif
         };
         return &gcInfo;
     }
 };
 
 template<typename T> class GarbageCollected;
-template<typename T, bool = WTF::IsSubclassOfTemplate<T, GarbageCollected>::value> struct GetGarbageCollectedBase;
+template<typename T, bool = WTF::IsSubclassOfTemplate<typename WTF::RemoveConst<T>::Type, GarbageCollected>::value> struct GetGarbageCollectedBase;
 
 template<typename T>
 struct GetGarbageCollectedBase<T, true> {
     typedef typename T::GarbageCollectedBase type;
 };
 
 template<typename T>
 struct GetGarbageCollectedBase<T, false> {
     typedef T type;
 };
 
 template<typename T>
 struct GCInfoTrait {
     static const GCInfo* get()
     {
         return GCInfoAtBase<typename GetGarbageCollectedBase<T>::type>::get();
     }
 };
 
 }
 
 #endif