--- libmalloc/libmalloc-283.100.5/src/platform.h
+++ libmalloc/libmalloc-140.50.6/src/platform.h
@@ -24,11 +24,11 @@
 #ifndef __PLATFORM_H
 #define __PLATFORM_H
 
-#if TARGET_OS_IPHONE && !TARGET_OS_SIMULATOR
+#if TARGET_OS_EMBEDDED
 #define MALLOC_TARGET_IOS 1
-#else // TARGET_OS_IPHONE && !TARGET_OS_SIMULATOR
+#else // MALLOC_TARGET_IOS
 #define MALLOC_TARGET_IOS 0
-#endif // TARGET_OS_IPHONE && !TARGET_OS_SIMULATOR
+#endif // MALLOC_TARGET_IOS
 
 #ifdef __LP64__
 #define MALLOC_TARGET_64BIT 1
@@ -45,7 +45,7 @@
 
 // <rdar://problem/12596555>
 #if MALLOC_TARGET_IOS
-# define CONFIG_RECIRC_DEPOT 1
+# define CONFIG_RECIRC_DEPOT 0
 # define CONFIG_AGGRESSIVE_MADVISE 1
 #else // MALLOC_TARGET_IOS
 # define CONFIG_RECIRC_DEPOT 1
@@ -57,6 +57,15 @@
 
 // <rdar://problem/19818071>
 #define CONFIG_MADVISE_STYLE MADV_FREE_REUSABLE
+
+// <rdar://problem/13807682>
+#if TARGET_OS_SIMULATOR
+#define CONFIG_OS_LOCK_HANDOFF 1
+#elif MALLOC_TARGET_IOS
+#define CONFIG_OS_LOCK_UNFAIR 1
+#else // MALLOC_TARGET_IOS
+#define CONFIG_OS_LOCK_UNFAIR 1
+#endif // MALLOC_TARGET_IOS
 
 #if MALLOC_TARGET_64BIT
 #define CONFIG_NANOZONE 1
@@ -72,18 +81,6 @@
 // This governs a last-free cache of 1 that bypasses the free-list for each region size
 #define CONFIG_TINY_CACHE 1
 #define CONFIG_SMALL_CACHE 1
-#define CONFIG_MEDIUM_CACHE 1
-
-// medium allocator enabled or disabled
-#if MALLOC_TARGET_64BIT
-#if MALLOC_TARGET_IOS
-#define CONFIG_MEDIUM_ALLOCATOR 0
-#else // MALLOC_TARGET_IOS
-#define CONFIG_MEDIUM_ALLOCATOR 1
-#endif // MALLOC_TARGET_IOS
-#else // MALLOC_TARGET_64BIT
-#define CONFIG_MEDIUM_ALLOCATOR 0
-#endif // MALLOC_TARGET_64BIT
 
 // The large last-free cache (aka. death row cache)
 #if MALLOC_TARGET_IOS
@@ -92,13 +89,20 @@
 #define CONFIG_LARGE_CACHE 1
 #endif
 
+// <rdar://problem/26823590> compile-time MALLOC_SMALL cut-off size
 #if MALLOC_TARGET_IOS
-// The VM system on iOS forces malloc-tagged memory to never be marked as
-// copy-on-write, this would include calls we make to vm_copy. Given that the
-// kernel would just be doing a memcpy, we force it to happen in userpsace.
-#define CONFIG_REALLOC_CAN_USE_VMCOPY 0
+#define CONFIG_SMALL_CUTTOFF_127KB 0
 #else
-#define CONFIG_REALLOC_CAN_USE_VMCOPY 1
+#define CONFIG_SMALL_CUTTOFF_127KB 1
+#endif // MALLOC_TARGET_IOS
+
+#if CONFIG_NANOZONE
+// <rdar://problem/35305995>
+#if MALLOC_TARGET_IOS && TARGET_OS_IOS
+#define CONFIG_NANO_SMALLMEM_DYNAMIC_DISABLE_35305995 1
+#else
+#define CONFIG_NANO_SMALLMEM_DYNAMIC_DISABLE_35305995 0
+#endif
 #endif
 
 // memory resource exception handling
@@ -114,9 +118,4 @@
 // presence of commpage number of cpu count
 #define CONFIG_HAS_COMMPAGE_NCPUS 1
 
-// Use of hyper-shift for magazine selection.
-#define CONFIG_NANO_USES_HYPER_SHIFT 0
-#define CONFIG_TINY_USES_HYPER_SHIFT 0
-#define CONFIG_SMALL_USES_HYPER_SHIFT 0
-
 #endif // __PLATFORM_H