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diff --git a/Source/JavaScriptCore/heap/CodeBlockSetInlines.h b/Source/JavaScriptCore/heap/CodeBlockSetInlines.h
new file mode 100644
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+++ b/Source/JavaScriptCore/heap/CodeBlockSetInlines.h
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+/*
+ * Copyright (C) 2016-2017 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.
+ * 3.  Neither the name of Apple Inc. ("Apple") nor the names of
+ *     its contributors may be used to endorse or promote products derived
+ *     from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "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 OR ITS 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.
+ */
+
+#pragma once
+
+#include "CodeBlock.h"
+#include "CodeBlockSet.h"
+
+namespace JSC {
+
+inline void CodeBlockSet::mark(const LockHolder& locker, void* candidateCodeBlock)
+{
+    ASSERT(m_lock.isLocked());
+    // We have to check for 0 and -1 because those are used by the HashMap as markers.
+    uintptr_t value = reinterpret_cast<uintptr_t>(candidateCodeBlock);
+    
+    // This checks for both of those nasty cases in one go.
+    // 0 + 1 = 1
+    // -1 + 1 = 0
+    if (value + 1 <= 1)
+        return;
+
+    CodeBlock* codeBlock = static_cast<CodeBlock*>(candidateCodeBlock); 
+    if (!m_oldCodeBlocks.contains(codeBlock) && !m_newCodeBlocks.contains(codeBlock))
+        return;
+
+    mark(locker, codeBlock);
+}
+
+inline void CodeBlockSet::mark(const LockHolder&, CodeBlock* codeBlock)
+{
+    if (!codeBlock)
+        return;
+
+    m_currentlyExecuting.add(codeBlock);
+}
+
+template<typename Functor>
+void CodeBlockSet::iterate(const Functor& functor)
+{
+    LockHolder locker(m_lock);
+    for (auto& codeBlock : m_oldCodeBlocks) {
+        bool done = functor(codeBlock);
+        if (done)
+            return;
+    }
+    
+    for (auto& codeBlock : m_newCodeBlocks) {
+        bool done = functor(codeBlock);
+        if (done)
+            return;
+    }
+}
+
+template<typename Functor>
+void CodeBlockSet::iterateCurrentlyExecuting(const Functor& functor)
+{
+    LockHolder locker(&m_lock);
+    for (CodeBlock* codeBlock : m_currentlyExecuting)
+        functor(codeBlock);
+}
+
+} // namespace JSC
+