--- /dev/null
+++ libmalloc/libmalloc-792.80.2/src/trace.h
@@ -0,0 +1,92 @@
+/*
+ * Copyright (c) 2016 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 __TRACE_H
+#define __TRACE_H
+
+// <sys/kdebug.h> defines these two subclasses for us:
+//   DBG_UMALLOC_EXTERNAL - for external entry points into malloc
+//   DBG_UMALLOC_INTERNAL - for tracing internal malloc state
+
+#ifndef _MALLOC_BUILDING_CODES_
+#include <sys/kdebug.h>
+__attribute__((cold))
+extern int
+kdebug_trace(uint32_t, uint64_t, uint64_t, uint64_t, uint64_t);
+#define MALLOC_TRACE(code,arg1,arg2,arg3,arg4) \
+	{ if (malloc_traced()) { kdebug_trace(code, arg1, arg2, arg3, arg4); } }
+#define TRACE_CODE(name, subclass, code) \
+	static const int TRACE_##name = KDBG_EVENTID(DBG_UMALLOC, subclass, code)
+#else
+# define DBG_UMALLOC 51
+# define DBG_UMALLOC_EXTERNAL 0x1
+# define DBG_UMALLOC_INTERNAL 0x2
+# define STR(x) #x
+# define TRACE_CODE(name, subclass, code) \
+	printf("0x%x\t%s\n", ((DBG_UMALLOC << 24) | ((subclass & 0xff) << 16) | ((code & 0x3fff) << 2)), STR(name))
+#endif
+
+// "external" trace points
+TRACE_CODE(malloc, DBG_UMALLOC_EXTERNAL, 0x01);
+TRACE_CODE(free, DBG_UMALLOC_EXTERNAL, 0x02);
+TRACE_CODE(realloc, DBG_UMALLOC_EXTERNAL, 0x03);
+TRACE_CODE(memalign, DBG_UMALLOC_EXTERNAL, 0x04);
+TRACE_CODE(calloc, DBG_UMALLOC_EXTERNAL, 0x05);
+TRACE_CODE(valloc, DBG_UMALLOC_EXTERNAL, 0x06);
+TRACE_CODE(malloc_options, DBG_UMALLOC_EXTERNAL, 0x07);
+
+// "internal" trace points
+TRACE_CODE(nano_malloc, DBG_UMALLOC_INTERNAL, 0x1);
+TRACE_CODE(tiny_malloc, DBG_UMALLOC_INTERNAL, 0x2);
+TRACE_CODE(small_malloc, DBG_UMALLOC_INTERNAL, 0x3);
+TRACE_CODE(large_malloc, DBG_UMALLOC_INTERNAL, 0x4);
+TRACE_CODE(nano_free, DBG_UMALLOC_INTERNAL, 0x5);
+TRACE_CODE(tiny_free, DBG_UMALLOC_INTERNAL, 0x6);
+TRACE_CODE(small_free, DBG_UMALLOC_INTERNAL, 0x7);
+TRACE_CODE(large_free, DBG_UMALLOC_INTERNAL, 0x8);
+TRACE_CODE(malloc_memory_pressure, DBG_UMALLOC_INTERNAL, 0x9);
+TRACE_CODE(nano_memory_pressure, DBG_UMALLOC_INTERNAL, 0xa);
+TRACE_CODE(madvise, DBG_UMALLOC_INTERNAL, 0xb);
+TRACE_CODE(medium_malloc, DBG_UMALLOC_INTERNAL, 0xc);
+TRACE_CODE(medium_free, DBG_UMALLOC_INTERNAL, 0xd);
+
+TRACE_CODE(nanov2_region_allocation, DBG_UMALLOC_INTERNAL, 0x10);
+TRACE_CODE(nanov2_region_reservation, DBG_UMALLOC_INTERNAL, 0x20);
+TRACE_CODE(nanov2_region_protection, DBG_UMALLOC_INTERNAL, 0x30);
+
+TRACE_CODE(xzone_malloc_install_skip, DBG_UMALLOC_INTERNAL, 0x100);
+TRACE_CODE(xzone_malloc_full_skip, DBG_UMALLOC_INTERNAL, 0x200);
+TRACE_CODE(xzone_malloc_success, DBG_UMALLOC_INTERNAL, 0x300);
+TRACE_CODE(xzone_malloc_from_empty, DBG_UMALLOC_INTERNAL, 0x400);
+TRACE_CODE(xzone_malloc_from_fresh, DBG_UMALLOC_INTERNAL, 0x500);
+TRACE_CODE(xzone_free, DBG_UMALLOC_INTERNAL, 0x600);
+TRACE_CODE(xzone_free_madvise, DBG_UMALLOC_INTERNAL, 0x700);
+TRACE_CODE(xzone_slot_upgrade, DBG_UMALLOC_INTERNAL, 0x800);
+TRACE_CODE(xzone_walk_lock, DBG_UMALLOC_INTERNAL, 0x900);
+TRACE_CODE(xzone_walk_unlock, DBG_UMALLOC_INTERNAL, 0xa00);
+TRACE_CODE(xzone_thread_detach, DBG_UMALLOC_INTERNAL, 0xb00);
+TRACE_CODE(xzone_thread_cache_malloc, DBG_UMALLOC_INTERNAL, 0xc00);
+TRACE_CODE(xzone_thread_cache_free, DBG_UMALLOC_INTERNAL, 0xd00);
+TRACE_CODE(xzone_list_upgrade, DBG_UMALLOC_INTERNAL, 0xe00);
+
+#endif // __TRACE_H