--- /dev/null
+++ libmalloc/libmalloc-409.60.6/src/stack_trace.h
@@ -0,0 +1,40 @@
+/*
+ * Copyright (c) 2020 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 _STACK_TRACE_H_
+#define _STACK_TRACE_H_
+
+#include "base.h"
+
+#include <mach/vm_types.h>
+#include <stddef.h>
+
+MALLOC_NOEXPORT MALLOC_NOINLINE
+size_t
+trace_collect(uint8_t *buffer, size_t size);
+
+MALLOC_NOEXPORT
+uint32_t
+trace_decode(const uint8_t *buffer, size_t size, vm_address_t *addrs, uint32_t num_addrs);
+
+#endif // _STACK_TRACE_H_