--- libmalloc/libmalloc-374.100.5/src/internal.h
+++ libmalloc/libmalloc-166.251.2/src/internal.h
@@ -24,10 +24,7 @@
 #ifndef __INTERNAL_H
 #define __INTERNAL_H
 
-// Toggles for fixes for specific Radars. If we get enough of these, we
-// probably should create a separate header file for them.
-#define RDAR_48993662 1
-#define OS_ATOMIC_CONFIG_MEMORY_ORDER_DEPENDENCY 1
+#define __OS_EXPOSE_INTERNALS__ 1
 
 #include <Availability.h>
 #include <TargetConditionals.h>
@@ -39,6 +36,7 @@
 #include <assert.h>
 #include <crt_externs.h>
 #include <dirent.h>
+#include <dlfcn.h>
 #include <errno.h>
 #include <fcntl.h>
 #include <libc.h>
@@ -56,20 +54,12 @@
 #include <mach/vm_page_size.h>
 #include <mach/vm_param.h>
 #include <mach/vm_statistics.h>
-#include <machine/cpu_capabilities.h>
-#include <os/atomic_private.h>
-#include <os/crashlog_private.h>
+#include <os/internal/internal_shared.h>
 #include <os/lock_private.h>
 #include <os/once_private.h>
 #include <os/overflow.h>
-#if !TARGET_OS_DRIVERKIT
-# include <os/feature_private.h>
-#endif
 #include <os/tsd.h>
 #include <paths.h>
-#include <pthread/pthread.h>  // _pthread_threadid_self_np_direct()
-#include <pthread/private.h>  // _pthread_threadid_self_np_direct()
-#include <pthread/tsd_private.h>  // TSD keys
 #include <signal.h>
 #include <stdarg.h>
 #include <stdbool.h>
@@ -85,55 +75,48 @@
 #include <sys/random.h>
 #include <sys/types.h>
 #include <sys/vmparam.h>
-#include <thread_stack_pcs.h>
 #include <unistd.h>
 #include <xlocale.h>
 
 #include "dtrace.h"
+
 #include "base.h"
 #include "trace.h"
 #include "platform.h"
 #include "debug.h"
 #include "locking.h"
 #include "bitarray.h"
-#include "malloc/malloc.h"
+#include "malloc.h"
 #include "printf.h"
 #include "frozen_malloc.h"
 #include "legacy_malloc.h"
 #include "magazine_malloc.h"
 #include "malloc_common.h"
 #include "nano_malloc_common.h"
+#include "nano_malloc.h"
 #include "nanov2_malloc.h"
-#include "pgm_malloc.h"
-#include "quarantine_malloc.h"
 #include "purgeable_malloc.h"
 #include "malloc_private.h"
+#include "stack_logging.h"
+#include "stack_logging_internal.h"
 #include "thresholds.h"
 #include "vm.h"
+
 #include "magazine_rack.h"
 #include "magazine_zone.h"
 #include "nano_zone_common.h"
 #include "nano_zone.h"
 #include "nanov2_zone.h"
+
 #include "magazine_inline.h"
-#include "stack_logging.h"
-#include "stack_trace.h"
-#include "malloc_implementation.h"
+
+extern uint64_t malloc_entropy[2];
 
 MALLOC_NOEXPORT
-extern bool malloc_tracing_enabled;
+extern boolean_t malloc_tracing_enabled;
 
 MALLOC_NOEXPORT
 extern unsigned malloc_debug_flags;
-
-MALLOC_NOEXPORT
-extern bool malloc_space_efficient_enabled;
-
-MALLOC_NOEXPORT
-extern bool malloc_medium_space_efficient_enabled;
-
-MALLOC_NOEXPORT
-extern bool malloc_quarantine_enabled;
 
 MALLOC_NOEXPORT MALLOC_NOINLINE
 void
@@ -143,43 +126,7 @@
 int
 malloc_gdb_po_unsafe(void);
 
-MALLOC_NOEXPORT __attribute__((always_inline, const))
-static inline bool
-malloc_traced(void)
-{
-	return malloc_tracing_enabled;
-}
-
-static inline uint32_t
-_malloc_cpu_number(void)
-{
-#if TARGET_OS_SIMULATOR
-	size_t n;
-	pthread_cpu_number_np(&n);
-	return (uint32_t)n;
-#else
-	return _os_cpu_number();
-#endif
-}
-
-/*
-  * Copies the malloc library's _malloc_msl_lite_hooks_t structure to a given
-  * location. Size is passed to allow the structure to  grow. Since this is
-  * a temporary arrangement, we don't need to worry about
-  * pointer authentication here or in the _malloc_msl_lite_hooks_t structure
-  * itself.
-  */
-struct _malloc_msl_lite_hooks_s;
-typedef void (*set_msl_lite_hooks_callout_t) (struct _malloc_msl_lite_hooks_s *hooksp, size_t size);
-void set_msl_lite_hooks(set_msl_lite_hooks_callout_t callout);
-
-
-// pthread reserves 5 TSD keys for libmalloc
-#define __TSD_MALLOC_PROB_GUARD_SAMPLE_COUNTER __PTK_LIBMALLOC_KEY0
-#define __TSD_MALLOC_UNUSED1                   __PTK_LIBMALLOC_KEY1
-#define __TSD_MALLOC_UNUSED2                   __PTK_LIBMALLOC_KEY2
-#define __TSD_MALLOC_UNUSED3                   __PTK_LIBMALLOC_KEY3
-#define __TSD_MALLOC_UNUSED4                   __PTK_LIBMALLOC_KEY4
-
+MALLOC_NOEXPORT
+extern uint64_t max_lite_mallocs;
 
 #endif // __INTERNAL_H