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diff --git a/Source/JavaScriptCore/b3/air/AirGenerationContext.h b/Source/JavaScriptCore/b3/air/AirGenerationContext.h
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+++ b/Source/JavaScriptCore/b3/air/AirGenerationContext.h
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+/*
+ * Copyright (C) 2015-2016 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. 
+ */
+
+#pragma once
+
+#if ENABLE(B3_JIT)
+
+#include "AirBasicBlock.h"
+#include "CCallHelpers.h"
+#include <wtf/Box.h>
+#include <wtf/IndexMap.h>
+#include <wtf/SharedTask.h>
+#include <wtf/Vector.h>
+
+namespace JSC { namespace B3 { namespace Air {
+
+class Code;
+
+struct GenerationContext {
+    WTF_MAKE_NONCOPYABLE(GenerationContext);
+public:
+
+    GenerationContext() = default;
+
+    typedef void LatePathFunction(CCallHelpers&, GenerationContext&);
+    typedef SharedTask<LatePathFunction> LatePath;
+
+    Vector<RefPtr<LatePath>> latePaths;
+    IndexMap<BasicBlock, Box<CCallHelpers::Label>> blockLabels;
+    BasicBlock* currentBlock { nullptr };
+    unsigned indexInBlock { UINT_MAX };
+    Code* code { nullptr };
+};
+
+} } } // namespace JSC::B3::Air
+
+#endif // ENABLE(B3_JIT)