--- /dev/null
+++ dyld/dyld-1323.3/mach_o/DataInCode.h
@@ -0,0 +1,66 @@
+/*
+ * Copyright (c) 2022 Apple Inc. All rights reserved.
+ *
+ * @APPLE_LICENSE_HEADER_START@
+ *
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this
+ * file.
+ *
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.
+ *
+ * @APPLE_LICENSE_HEADER_END@
+ */
+
+
+#ifndef mach_o_DataInCode_h
+#define mach_o_DataInCode_h
+
+#include <span>
+#include <stdint.h>
+
+#include "MachODefines.h"
+#include "Error.h"
+
+namespace mach_o {
+
+/*!
+ * @class DataInCode
+ *
+ * @abstract
+ *      Class to encapsulate accessing and building data in code
+ */
+class VIS_HIDDEN DataInCode
+{
+public:
+                        // construct from a chunk of LINKEDIT
+                        DataInCode(const uint8_t* start, size_t size);
+
+    struct Entry
+    {
+        // TODO: Implement this
+    };
+
+    Error   valid() const;
+
+    static uint32_t     dataInCodeSize(bool is64);
+
+protected:
+
+    const uint8_t*       _dataInCodeStart;
+    const uint8_t*       _dataInCodeEnd;
+};
+
+
+} // namespace mach_o
+
+#endif // mach_o_CompactUnwind_h