Oilpan: Remove a visitor parameter from isHeapObjectAlive

Source/platform/heap/GarbageCollected.h

Index: Source/platform/heap/GarbageCollected.h
diff --git a/Source/platform/heap/GarbageCollected.h b/Source/platform/heap/GarbageCollected.h
index 87367ea4fbba7a5be5c2dbb5f6a47e58d8db7da9..ce920621a9261b50b4a0f51985a43131018340b0 100644
--- a/Source/platform/heap/GarbageCollected.h
+++ b/Source/platform/heap/GarbageCollected.h
@@ -112,11 +112,10 @@ class PLATFORM_EXPORT GarbageCollectedMixin {
 public:
     typedef int IsGarbageCollectedMixinMarker;
     virtual void adjustAndMark(Visitor*) const = 0;
-    virtual bool isHeapObjectAlive(Visitor*) const = 0;
     virtual void trace(Visitor*) { }
     virtual void adjustAndMark(InlinedGlobalMarkingVisitor) const = 0;
-    virtual bool isHeapObjectAlive(InlinedGlobalMarkingVisitor) const = 0;
     virtual void trace(InlinedGlobalMarkingVisitor);
+    virtual bool isHeapObjectAlive() const = 0;
 };
 
 #define DEFINE_GARBAGE_COLLECTED_MIXIN_METHODS(VISITOR, TYPE)           \
@@ -132,11 +131,7 @@ public:
         }                                                               \
         visitor->mark(static_cast<const TYPE*>(this), &blink::TraceTrait<TYPE>::trace); \
     }                                                                   \
-    virtual bool isHeapObjectAlive(VISITOR visitor) const override      \
-    {                                                                   \
-        return visitor->isHeapObjectAlive(this);                        \
-    }                                                                   \
-private:
+    private:
 
 // A C++ object's vptr will be initialized to its leftmost base's vtable after
 // the constructors of all its subclasses have run, so if a subclass constructor
@@ -157,18 +152,18 @@ private:
 //    GarbageCollectedMixinConstructorMarker's constructor takes care of
 //    this and the field is declared by way of USING_GARBAGE_COLLECTED_MIXIN().
 
-#define DEFINE_GARBAGE_COLLECTED_MIXIN_CONSTRUCTOR_MARKER(TYPE)                         \
-public:                                                                                 \
-    GC_PLUGIN_IGNORE("crbug.com/456823") NO_SANITIZE_UNRELATED_CAST                     \
-    void* operator new(size_t size)                                                     \
-    {                                                                                   \
+#define DEFINE_GARBAGE_COLLECTED_MIXIN_CONSTRUCTOR_MARKER(TYPE)         \
+    public:                                                             \
+    GC_PLUGIN_IGNORE("crbug.com/456823") NO_SANITIZE_UNRELATED_CAST     \
+    void* operator new(size_t size)                                     \
+{                                                                       \
         void* object = TYPE::allocateObject(size, IsEagerlyFinalizedType<TYPE>::value); \
         ThreadState* state = ThreadStateFor<ThreadingTrait<TYPE>::Affinity>::state();   \
         state->enterGCForbiddenScopeIfNeeded(&(reinterpret_cast<TYPE*>(object)->m_mixinConstructorMarker)); \
-        return object;                                                                  \
-    }                                                                                   \
-    GarbageCollectedMixinConstructorMarker m_mixinConstructorMarker;                    \
-private:
+        return object;                                                  \
+    }                                                                   \
+    GarbageCollectedMixinConstructorMarker m_mixinConstructorMarker;    \
+    private:
 
 // Mixins that wrap/nest others requires extra handling:
 //
@@ -189,10 +184,16 @@ private:
 // when the "operator new" for B runs, and leaving the forbidden GC scope
 // when the constructor of the recorded GarbageCollectedMixinConstructorMarker
 // runs.
-#define USING_GARBAGE_COLLECTED_MIXIN(TYPE)                       \
-    DEFINE_GARBAGE_COLLECTED_MIXIN_METHODS(blink::Visitor*, TYPE) \
+#define USING_GARBAGE_COLLECTED_MIXIN(TYPE)                             \
+    DEFINE_GARBAGE_COLLECTED_MIXIN_METHODS(blink::Visitor*, TYPE)       \
     DEFINE_GARBAGE_COLLECTED_MIXIN_METHODS(blink::InlinedGlobalMarkingVisitor, TYPE) \
-    DEFINE_GARBAGE_COLLECTED_MIXIN_CONSTRUCTOR_MARKER(TYPE)
+    DEFINE_GARBAGE_COLLECTED_MIXIN_CONSTRUCTOR_MARKER(TYPE)             \
+public:                                                                 \
+    virtual bool isHeapObjectAlive() const override                     \
+    {                                                                   \
+        return Heap::isHeapObjectAlive(this);                           \
+    }                                                                   \
+private:
 
 #if ENABLE(OILPAN)
 #define WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(TYPE) USING_GARBAGE_COLLECTED_MIXIN(TYPE)
@@ -403,6 +404,24 @@ private:
 #define GC_PLUGIN_IGNORE(bug)
 #endif
 
+template<typename T, bool = WTF::IsSubclassOfTemplate<typename WTF::RemoveConst<T>::Type, GarbageCollected>::value> class NeedsAdjustAndMark;
+
+template<typename T>
+class NeedsAdjustAndMark<T, true> {
+    static_assert(sizeof(T), "T must be fully defined");
+public:
+    static const bool value = false;
+};
+template <typename T> const bool NeedsAdjustAndMark<T, true>::value;
+
+template<typename T>
+class NeedsAdjustAndMark<T, false> {
+    static_assert(sizeof(T), "T must be fully defined");
+public:
+    static const bool value = IsGarbageCollectedMixin<typename WTF::RemoveConst<T>::Type>::value;
+};
+template <typename T> const bool NeedsAdjustAndMark<T, false>::value;
+
 } // namespace blink
 
 #endif