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diff --git a/Source/JavaScriptCore/b3/B3Effects.cpp b/Source/JavaScriptCore/b3/B3Effects.cpp
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+++ b/Source/JavaScriptCore/b3/B3Effects.cpp
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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. 
+ */
+
+#include "config.h"
+#include "B3Effects.h"
+
+#if ENABLE(B3_JIT)
+
+#include <wtf/CommaPrinter.h>
+#include <wtf/DataLog.h>
+
+namespace JSC { namespace B3 {
+
+namespace {
+
+// These helpers cascade in such a way that after the helper for terminal, we don't have to worry
+// about terminal again, since the terminal case considers all ways that a terminal may interfere
+// with something else. And after the exit sideways case, we don't have to worry about either
+// exitsSideways or terminal. And so on...
+
+bool interferesWithTerminal(const Effects& terminal, const Effects& other)
+{
+    if (!terminal.terminal)
+        return false;
+    return other.terminal || other.controlDependent || other.writesLocalState || other.writes || other.writesPinned;
+}
+
+bool interferesWithExitSideways(const Effects& exitsSideways, const Effects& other)
+{
+    if (!exitsSideways.exitsSideways)
+        return false;
+    return other.controlDependent || other.writes || other.writesPinned;
+}
+
+bool interferesWithWritesLocalState(const Effects& writesLocalState, const Effects& other)
+{
+    if (!writesLocalState.writesLocalState)
+        return false;
+    return other.writesLocalState || other.readsLocalState;
+}
+
+bool interferesWithWritesPinned(const Effects& writesPinned, const Effects& other)
+{
+    if (!writesPinned.writesPinned)
+        return false;
+    return other.writesPinned || other.readsPinned;
+}
+
+} // anonymous namespace
+
+bool Effects::interferes(const Effects& other) const
+{
+    return interferesWithTerminal(*this, other)
+        || interferesWithTerminal(other, *this)
+        || interferesWithExitSideways(*this, other)
+        || interferesWithExitSideways(other, *this)
+        || interferesWithWritesLocalState(*this, other)
+        || interferesWithWritesLocalState(other, *this)
+        || interferesWithWritesPinned(*this, other)
+        || interferesWithWritesPinned(other, *this)
+        || writes.overlaps(other.writes)
+        || writes.overlaps(other.reads)
+        || reads.overlaps(other.writes);
+}
+
+bool Effects::operator==(const Effects& other) const
+{
+    return terminal == other.terminal
+        && exitsSideways == other.exitsSideways
+        && controlDependent == other.controlDependent
+        && writesLocalState == other.writesLocalState
+        && readsLocalState == other.readsLocalState
+        && writesPinned == other.writesPinned
+        && readsPinned == other.readsPinned
+        && writes == other.writes
+        && reads == other.reads;
+}
+
+bool Effects::operator!=(const Effects& other) const
+{
+    return !(*this == other);
+}
+
+void Effects::dump(PrintStream& out) const
+{
+    CommaPrinter comma("|");
+    if (terminal)
+        out.print(comma, "Terminal");
+    if (exitsSideways)
+        out.print(comma, "ExitsSideways");
+    if (controlDependent)
+        out.print(comma, "ControlDependent");
+    if (writesLocalState)
+        out.print(comma, "WritesLocalState");
+    if (readsLocalState)
+        out.print(comma, "ReadsLocalState");
+    if (writesPinned)
+        out.print(comma, "WritesPinned");
+    if (readsPinned)
+        out.print(comma, "ReadsPinned");
+    if (writes)
+        out.print(comma, "Writes:", writes);
+    if (reads)
+        out.print(comma, "Reads:", reads);
+}
+
+} } // namespace JSC::B3
+
+#endif // ENABLE(B3_JIT)
+