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diff --git a/js/src/regexp/regexp-interpreter.h b/js/src/regexp/regexp-interpreter.h
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index 0000000000..c3f6c119e8
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+++ b/js/src/regexp/regexp-interpreter.h
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+// Copyright 2011 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// A simple interpreter for the Irregexp byte code.
+
+#ifndef V8_REGEXP_REGEXP_INTERPRETER_H_
+#define V8_REGEXP_REGEXP_INTERPRETER_H_
+
+#include "regexp/regexp.h"
+
+namespace v8 {
+namespace internal {
+
+class V8_EXPORT_PRIVATE IrregexpInterpreter : public AllStatic {
+ public:
+  enum Result {
+    FAILURE = RegExp::kInternalRegExpFailure,
+    SUCCESS = RegExp::kInternalRegExpSuccess,
+    EXCEPTION = RegExp::kInternalRegExpException,
+    RETRY = RegExp::kInternalRegExpRetry,
+  };
+
+  // In case a StackOverflow occurs, a StackOverflowException is created and
+  // EXCEPTION is returned.
+  static Result MatchForCallFromRuntime(Isolate* isolate,
+                                        Handle<JSRegExp> regexp,
+                                        Handle<String> subject_string,
+                                        int* registers, int registers_length,
+                                        int start_position);
+
+  // In case a StackOverflow occurs, EXCEPTION is returned. The caller is
+  // responsible for creating the exception.
+  // RETRY is returned if a retry through the runtime is needed (e.g. when
+  // interrupts have been scheduled or the regexp is marked for tier-up).
+  // Arguments input_start, input_end and backtrack_stack are
+  // unused. They are only passed to match the signature of the native irregex
+  // code.
+  static Result MatchForCallFromJs(Address subject, int32_t start_position,
+                                   Address input_start, Address input_end,
+                                   int* registers, int32_t registers_length,
+                                   Address backtrack_stack,
+                                   RegExp::CallOrigin call_origin,
+                                   Isolate* isolate, Address regexp);
+
+  static Result MatchInternal(Isolate* isolate, ByteArray code_array,
+                              String subject_string, int* registers,
+                              int registers_length, int start_position,
+                              RegExp::CallOrigin call_origin,
+                              uint32_t backtrack_limit);
+
+ private:
+  static Result Match(Isolate* isolate, JSRegExp regexp, String subject_string,
+                      int* registers, int registers_length, int start_position,
+                      RegExp::CallOrigin call_origin);
+};
+
+}  // namespace internal
+}  // namespace v8
+
+#endif  // V8_REGEXP_REGEXP_INTERPRETER_H_