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diff --git a/js/public/LegacyIntTypes.h b/js/public/LegacyIntTypes.h
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
+ * vim: set ts=8 sts=4 et sw=4 tw=99:
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/*
+ * This section typedefs the old 'native' types to the new <stdint.h> types.
+ * These redefinitions are provided solely to allow JSAPI users to more easily
+ * transition to <stdint.h> types.  They are not to be used in the JSAPI, and
+ * new JSAPI user code should not use them.  This mapping file may eventually
+ * be removed from SpiderMonkey, so don't depend on it in the long run.
+ */
+
+/*
+ * BEWARE: Comity with other implementers of these types is not guaranteed.
+ *         Indeed, if you use this header and third-party code defining these
+ *         types, *expect* to encounter either compile errors or link errors,
+ *         depending how these types are used and on the order of inclusion.
+ *         It is safest to use only the <stdint.h> types.
+ */
+#ifndef js_LegacyIntTypes_h
+#define js_LegacyIntTypes_h
+
+#include <stdint.h>
+
+#include "js-config.h"
+
+typedef uint8_t uint8;
+typedef uint16_t uint16;
+typedef uint32_t uint32;
+typedef uint64_t uint64;
+
+/*
+ * On AIX 4.3, sys/inttypes.h (which is included by sys/types.h, a very
+ * common header file) defines the types int8, int16, int32, and int64.
+ * So we don't define these four types here to avoid conflicts in case
+ * the code also includes sys/types.h.
+ */
+#if defined(AIX) && defined(HAVE_SYS_INTTYPES_H)
+#include <sys/inttypes.h>
+#else
+typedef int8_t int8;
+typedef int16_t int16;
+typedef int32_t int32;
+typedef int64_t int64;
+#endif /* AIX && HAVE_SYS_INTTYPES_H */
+
+typedef uint8_t JSUint8;
+typedef uint16_t JSUint16;
+typedef uint32_t JSUint32;
+typedef uint64_t JSUint64;
+
+typedef int8_t JSInt8;
+typedef int16_t JSInt16;
+typedef int32_t JSInt32;
+typedef int64_t JSInt64;
+
+#endif /* js_LegacyIntTypes_h */