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diff --git a/js/src/zydis/Zydis/ShortString.h b/js/src/zydis/Zydis/ShortString.h
new file mode 100644
index 0000000000..377a31a81d
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+++ b/js/src/zydis/Zydis/ShortString.h
@@ -0,0 +1,93 @@
+/***************************************************************************************************
+
+  Zyan Disassembler Library (Zydis)
+
+  Original Author : Florian Bernd
+
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+
+***************************************************************************************************/
+
+/**
+ * @file
+ * Defines the immutable and storage-efficient `ZydisShortString` struct, which
+ * is used to store strings in the generated tables.
+ */
+
+#ifndef ZYDIS_SHORTSTRING_H
+#define ZYDIS_SHORTSTRING_H
+
+#include "zydis/Zycore/Defines.h"
+#include "zydis/Zycore/Types.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* ============================================================================================== */
+/* Enums and types                                                                                */
+/* ============================================================================================== */
+
+#if !(defined(ZYAN_AARCH64) && defined(ZYAN_APPLE))
+#   pragma pack(push, 1)
+#endif
+
+/**
+ * Defines the `ZydisShortString` struct.
+ *
+ * This compact struct is mainly used for internal string-tables to save up some bytes.
+ *
+ * All fields in this struct should be considered as "private". Any changes may lead to unexpected
+ * behavior.
+ */
+typedef struct ZydisShortString_
+{
+    /**
+     * The buffer that contains the actual (null-terminated) string.
+    */
+    const char* data;
+    /**
+     * The length (number of characters) of the string (without 0-termination).
+    */
+    ZyanU8 size;
+} ZydisShortString;
+
+#if !(defined(ZYAN_AARCH64) && defined(ZYAN_APPLE))
+#   pragma pack(pop)
+#endif
+
+/* ============================================================================================== */
+/* Macros                                                                                         */
+/* ============================================================================================== */
+
+/**
+ * Declares a `ZydisShortString` from a static C-style string.
+ *
+ * @param   string  The C-string constant.
+ */
+#define ZYDIS_MAKE_SHORTSTRING(string) \
+    { string, sizeof(string) - 1 }
+
+/* ============================================================================================== */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* ZYDIS_SHORTSTRING_H */