--- /dev/null
+++ libmalloc/libmalloc-166.251.2/src/stack_logging_internal.h
@@ -0,0 +1,62 @@
+/*
+ * 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 stack_logging_disk_h
+#define stack_logging_disk_h
+
+extern int stack_logging_enable_logging; /* when clear, no logging takes place */
+extern int stack_logging_dontcompact; /* default is to compact; when set does not compact alloc/free logs; useful for tracing history */
+extern int stack_logging_finished_init; /* set after we've returned from the Libsystem initialiser */
+extern int stack_logging_postponed; /* set if we needed to postpone logging till after initialisation */
+extern int stack_logging_mode;
+
+extern const uint64_t __invalid_stack_id;
+
+// returns the stack id
+uint64_t __enter_stack_into_table_while_locked(vm_address_t self_thread, uint32_t num_hot_to_skip, boolean_t add_thread_id, size_t ptr_size);
+
+void __malloc_lock_stack_logging();
+void __malloc_unlock_stack_logging();
+
+// support for gdb and others checking for stack_logging locks
+extern boolean_t __stack_logging_locked();
+
+extern boolean_t __prepare_to_log_stacks(boolean_t lite_or_vmlite_mode);
+extern void __prepare_to_log_stacks_stage2();
+
+// support for multi-threaded forks
+extern void __stack_logging_fork_prepare();
+extern void __stack_logging_fork_parent();
+extern void __stack_logging_fork_child();
+extern void __stack_logging_early_finished();
+
+void __decrement_table_slot_refcount(uint64_t stackID, size_t size);
+
+void __delete_uniquing_table_memory_while_locked();
+boolean_t __uniquing_table_memory_was_deleted(void);
+
+// Returns true if the stack logging lite malloc zone is enabled. Does not indicate if VM-only lite mode is enabled.
+boolean_t is_stack_logging_lite_enabled(void);
+
+
+#endif /* stack_logging_disk_h */