diff -r 000000000000 -r 6474c204b198 js/src/yarr/Yarr.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/yarr/Yarr.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,72 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
+ * vim: set ts=8 sts=4 et sw=4 tw=99:
+ *
+ * Copyright (C) 2009 Apple Inc. All rights reserved.
+ * Copyright (C) 2010 Peter Varga (pvarga@inf.u-szeged.hu), University of Szeged
+ * 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 UNIVERSITY OF SZEGED ``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 UNIVERSITY OF SZEGED 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.
+ */
+
+#ifndef yarr_Yarr_h
+#define yarr_Yarr_h
+
+#include <limits.h>
+#include "yarr/YarrInterpreter.h"
+#include "yarr/YarrPattern.h"
+
+namespace JSC { namespace Yarr {
+
+#define YarrStackSpaceForBackTrackInfoPatternCharacter 1 // Only for !fixed quantifiers.
+#define YarrStackSpaceForBackTrackInfoCharacterClass 1 // Only for !fixed quantifiers.
+#define YarrStackSpaceForBackTrackInfoBackReference 2
+#define YarrStackSpaceForBackTrackInfoAlternative 1 // One per alternative.
+#define YarrStackSpaceForBackTrackInfoParentheticalAssertion 1
+#define YarrStackSpaceForBackTrackInfoParenthesesOnce 1 // Only for !fixed quantifiers.
+#define YarrStackSpaceForBackTrackInfoParenthesesTerminal 1
+#define YarrStackSpaceForBackTrackInfoParentheses 2
+
+static const unsigned quantifyInfinite = UINT_MAX;
+static const unsigned offsetNoMatch = (unsigned)-1;
+static const unsigned offsetError = (unsigned)-2;
+
+// The below limit restricts the number of "recursive" match calls in order to
+// avoid spending exponential time on complex regular expressions.
+static const unsigned matchLimit = 2500000;
+
+enum JSRegExpResult {
+    JSRegExpMatch = 1,
+    JSRegExpNoMatch = 0,
+    JSRegExpErrorNoMatch = -1,
+    JSRegExpErrorHitLimit = -2,
+    JSRegExpErrorNoMemory = -3,
+    JSRegExpErrorInternal = -4
+};
+
+enum YarrCharSize {
+    Char8,
+    Char16
+};
+
+} } // namespace JSC::Yarr
+
+#endif /* yarr_Yarr_h */