--- /dev/null
+++ libmalloc/libmalloc-374.60.3/private/malloc_implementation.h
@@ -0,0 +1,110 @@
+/*
+ * Copyright (c) 2018 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@
+ */
+
+/* Private interfaces between libsystem_malloc, libSystem, and MallocStackLogging */
+
+#include <malloc/malloc.h>
+#include <stack_logging.h>
+
+#ifndef _MALLOC_IMPLEMENTATION_H_
+#define _MALLOC_IMPLEMENTATION_H_
+
+
+/*********	Libsystem initializers ************/
+
+struct _malloc_msl_lite_hooks_s;
+
+struct _malloc_msl_symbols {
+	unsigned long version;
+
+	/* the following are included in version 1 of this structure */
+
+	void (*handle_memory_event) (unsigned long event);
+	boolean_t (*stack_logging_locked) (void);
+	void (*fork_prepare) (void);
+	void (*fork_parent) (void);
+	void (*fork_child) (void);
+
+	void (*set_flags_from_environment) (const char **env);
+	void (*initialize) ();
+	boolean_t (*turn_on_stack_logging) (stack_logging_mode_type mode);
+	void (*turn_off_stack_logging) ();
+	void (*copy_msl_lite_hooks) (struct _malloc_msl_lite_hooks_s *hooksp, size_t size);
+};
+
+
+struct _malloc_late_init {
+	unsigned long version;
+	/* The following functions are included in version 1 of this structure */
+	void * (*dlopen) (const char *path, int mode);
+	void * (*dlsym) (void *handle, const char *symbol);
+	bool internal_diagnostics;  /* os_variant_has_internal_diagnostics() */
+	/* The following are included in version 2 of this structure */
+	const struct _malloc_msl_symbols *msl;
+};
+
+void __malloc_init(const char *apple[]);
+void __malloc_late_init(const struct _malloc_late_init *);
+
+
+
+/*
+ * Definitions intended for the malloc stack logging library only.
+ * This is SPI that is *not* intended for use elsewhere. It will change
+ * and will eventually be removed, without prior warning.
+ */
+#if MALLOC_ENABLE_MSL_LITE_SPI
+
+typedef struct szone_s szone_t;
+
+typedef struct _malloc_msl_lite_hooks_s {
+	szone_t *(*create_and_insert_msl_lite_zone)(const char *name,
+											void *mallocp, void *callocp,
+											void *vallocp, void *reallocp, void *batch_mallocp,
+											void *batch_freep, void *memalignp, void *freep,
+											void *free_definite_sizep, void *sizep);
+	malloc_zone_t *(*helper_zone)(szone_t *zone);
+	size_t (*szone_size)(szone_t *szone, const void *ptr);
+	void *(*szone_malloc)(szone_t *szone, size_t size);
+	void *(*szone_malloc_should_clear)(szone_t *szone, size_t size,
+									   boolean_t cleared_requested);
+	void (*szone_free)(szone_t *szone, void *ptr);
+	void *(*szone_realloc)(szone_t *szone, void *ptr, size_t new_size);
+	void *(*szone_valloc)(szone_t *szone, size_t size);
+	void *(*szone_memalign)(szone_t *szone, size_t alignment, size_t size);
+	unsigned (*szone_batch_malloc)(szone_t *szone, size_t size, void **results,
+								   unsigned count);
+	void (*szone_batch_free)(szone_t *szone, void **to_be_freed, unsigned count);
+	boolean_t (*has_default_zone0)(void);
+	
+	size_t (*calloc_get_size)(size_t num_items, size_t size, size_t extra_size,
+							  size_t *total_size);
+
+	size_t (*szone_good_size)(szone_t *szone, size_t size);
+	malloc_zone_t *(*basic_zone)(szone_t *zone);
+} _malloc_msl_lite_hooks_t;
+
+#endif // MALLOC_ENABLE_MSL_LITE_SPI
+
+#endif
+