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diff --git a/Source/JavaScriptCore/dfg/DFGRegisteredStructureSet.cpp b/Source/JavaScriptCore/dfg/DFGRegisteredStructureSet.cpp
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+++ b/Source/JavaScriptCore/dfg/DFGRegisteredStructureSet.cpp
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+/*
+ * Copyright (C) 2017 Apple 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:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
+ */
+
+#include "config.h"
+#include "DFGRegisteredStructureSet.h"
+
+#if ENABLE(DFG_JIT)
+
+#include "DFGAbstractValue.h"
+#include "TrackedReferences.h"
+
+namespace JSC { namespace DFG {
+
+void RegisteredStructureSet::filter(const DFG::StructureAbstractValue& other)
+{
+    genericFilter(
+        [&] (RegisteredStructure structure) -> bool {
+            return other.contains(structure); 
+        });
+}
+
+void RegisteredStructureSet::filter(SpeculatedType type)
+{
+    genericFilter(
+        [&] (RegisteredStructure structure) -> bool {
+            return type & speculationFromStructure(structure.get());
+        });
+}
+
+void RegisteredStructureSet::filterArrayModes(ArrayModes arrayModes)
+{
+    genericFilter(
+        [&] (RegisteredStructure structure) -> bool {
+            return arrayModes & arrayModeFromStructure(structure.get());
+        });
+}
+
+void RegisteredStructureSet::filter(const DFG::AbstractValue& other)
+{
+    filter(other.m_structure);
+    filter(other.m_type);
+    filterArrayModes(other.m_arrayModes);
+}
+
+SpeculatedType RegisteredStructureSet::speculationFromStructures() const
+{
+    SpeculatedType result = SpecNone;
+    forEach(
+        [&] (RegisteredStructure structure) {
+            mergeSpeculation(result, speculationFromStructure(structure.get()));
+        });
+    return result;
+}
+
+ArrayModes RegisteredStructureSet::arrayModesFromStructures() const
+{
+    ArrayModes result = 0;
+    forEach(
+        [&] (RegisteredStructure structure) {
+            mergeArrayModes(result, asArrayModes(structure->indexingType()));
+        });
+    return result;
+}
+
+void RegisteredStructureSet::validateReferences(const TrackedReferences& trackedReferences) const
+{
+    // The type system should help us here, but protect people from getting that wrong using bitwise_cast or something crazy.
+    forEach(
+        [&] (RegisteredStructure structure) {
+            trackedReferences.check(structure.get());
+        });
+}
+
+} } // namespace JSC::DFG
+
+#endif // ENABLE(DFG_JIT)