--- /dev/null
+++ libmalloc/libmalloc-283/src/debug.h
@@ -0,0 +1,62 @@
+/*
+ * Copyright (c) 2015 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 __DEBUG_H
+#define __DEBUG_H
+
+// set to one to debug malloc itself
+#define DEBUG_MALLOC 0
+// set to one to debug malloc client
+#define DEBUG_CLIENT 0
+#define DEBUG_MADVISE 0
+
+#if DEBUG_MALLOC
+#   warning DEBUG_MALLOC ENABLED
+#   undef MALLOC_INLINE
+#   undef MALLOC_UNUSED
+#   undef MALLOC_ALWAYS_INLINE
+#   undef CHECK_MAGAZINE_PTR_LOCKED
+
+#   define MALLOC_INLINE
+#   define MALLOC_UNUSED
+#   define MALLOC_ALWAYS_INLINE
+#   define CHECK_MAGAZINE_PTR_LOCKED(szone, mag_ptr, fun)				\
+	do {										\
+	    if (TRY_LOCK(mag_ptr->magazine_lock)) {					\
+		malloc_report(ASL_LEVEL_ERR, "*** magazine_lock was not set %p in %s\n",		\
+		mag_ptr->magazine_lock, fun);						\
+	    }										\
+	} while (0)
+#endif // DEBUG_MALLOC
+
+#if DEBUG_MALLOC || DEBUG_CLIENT
+#	define CHECK(szone, fun) \
+	if ((szone)->debug_flags & CHECK_REGIONS) { \
+		szone_check_all(szone, fun) \
+	}
+#else // DEBUG_MALLOC || DEBUG_CLIENT
+#	define CHECK(szone, fun) \
+	do {} while (0)
+#endif // DEBUG_MALLOC || DEBUG_CLIENT
+
+#endif // __DEBUG_H