--- libmalloc/libmalloc-317.121.1/src/platform.h
+++ libmalloc/libmalloc-646.40.3/src/platform.h
@@ -24,11 +24,25 @@
 #ifndef __PLATFORM_H
 #define __PLATFORM_H
 
-#if TARGET_OS_IPHONE && !TARGET_OS_SIMULATOR
+#include <TargetConditionals.h>
+
+#ifndef MALLOC_TARGET_DK_OSX
+#define MALLOC_TARGET_DK_OSX 0
+#endif // MALLOC_TARGET_DK_OSX
+
+#ifndef MALLOC_TARGET_DK_IOS
+#define MALLOC_TARGET_DK_IOS 0
+#endif // MALLOC_TARGET_DK_OSX
+
+#ifndef MALLOC_TARGET_EXCLAVES_INTROSPECTOR
+#define MALLOC_TARGET_EXCLAVES_INTROSPECTOR 0
+#endif // MALLOC_TARGET_EXCLAVES_INTROSPECTOR
+
+#if (TARGET_OS_IPHONE && !TARGET_OS_SIMULATOR) || (TARGET_OS_DRIVERKIT && !MALLOC_TARGET_DK_OSX)
 #define MALLOC_TARGET_IOS 1
-#else // TARGET_OS_IPHONE && !TARGET_OS_SIMULATOR
+#else // (TARGET_OS_IPHONE && !TARGET_OS_SIMULATOR) || (TARGET_OS_DRIVERKIT && !MALLOC_TARGET_DK_OSX)
 #define MALLOC_TARGET_IOS 0
-#endif // TARGET_OS_IPHONE && !TARGET_OS_SIMULATOR
+#endif // (TARGET_OS_IPHONE && !TARGET_OS_SIMULATOR) || (TARGET_OS_DRIVERKIT && !MALLOC_TARGET_DK_OSX)
 
 #ifdef __LP64__
 #define MALLOC_TARGET_64BIT 1
@@ -36,12 +50,19 @@
 #define MALLOC_TARGET_64BIT 0
 #endif
 
-// <rdar://problem/12596555>
-#if MALLOC_TARGET_IOS
-# define CONFIG_MADVISE_PRESSURE_RELIEF 0
-#else // MALLOC_TARGET_IOS
-# define CONFIG_MADVISE_PRESSURE_RELIEF 1
-#endif // MALLOC_TARGET_IOS
+#if !defined(TARGET_OS_EXCLAVECORE)
+#define TARGET_OS_EXCLAVECORE 0
+#endif
+
+#if !defined(TARGET_OS_EXCLAVEKIT)
+#define TARGET_OS_EXCLAVEKIT 0
+#endif
+
+#if TARGET_OS_EXCLAVECORE || TARGET_OS_EXCLAVEKIT
+#define MALLOC_TARGET_EXCLAVES 1
+#else // TARGET_OS_EXCLAVECORE || TARGET_OS_EXCLAVEKIT
+#define MALLOC_TARGET_EXCLAVES 0
+#endif // TARGET_OS_EXCLAVECORE || TARGET_OS_EXCLAVEKIT
 
 // <rdar://problem/12596555>
 #define CONFIG_RECIRC_DEPOT 1
@@ -49,8 +70,12 @@
 
 #if MALLOC_TARGET_IOS
 # define DEFAULT_AGGRESSIVE_MADVISE_ENABLED true
+// <rdar://problem/12596555>
+# define CONFIG_MADVISE_PRESSURE_RELIEF 0
 #else // MALLOC_TARGET_IOS
 # define DEFAULT_AGGRESSIVE_MADVISE_ENABLED false
+// <rdar://problem/12596555>
+# define CONFIG_MADVISE_PRESSURE_RELIEF 1
 #endif // MALLOC_TARGET_IOS
 
 // <rdar://problem/10397726>
@@ -69,6 +94,18 @@
 
 // enable nano checking for corrupt free list
 #define NANO_FREE_DEQUEUE_DILIGENCE 1
+
+// Conditional behaviour depends on MallocSpaceEfficient being set by
+// JetsamProperties which isn't true on iOS
+#if MALLOC_TARGET_IOS || TARGET_OS_DRIVERKIT
+#define NANOV2_DEFAULT_MODE NANO_ENABLED
+#else
+#define NANOV2_DEFAULT_MODE NANO_CONDITIONAL
+#endif
+
+// whether to pre-reserve all available nano regions during initialization
+#define CONFIG_NANO_RESERVE_REGIONS 0
+
 
 // This governs a last-free cache of 1 that bypasses the free-list for each region size
 #define CONFIG_TINY_CACHE 1
@@ -86,16 +123,46 @@
 #define CONFIG_MEDIUM_ALLOCATOR 0
 #endif // MALLOC_TARGET_64BIT
 
+
+#if CONFIG_MEDIUM_ALLOCATOR
+#define DEFAULT_MEDIUM_ALLOCATOR_ENABLED 1
+#else // CONFIG_MEDIUM_ALLOCATOR
+#define DEFAULT_MEDIUM_ALLOCATOR_ENABLED 0
+#endif // CONFIG_MEDIUM_ALLOCATOR
+
+
 // The large last-free cache (aka. death row cache)
-#if MALLOC_TARGET_IOS
+#if TARGET_OS_IOS || TARGET_OS_SIMULATOR || TARGET_OS_DRIVERKIT
+// sdk=iphoneos, simulator, sdk=driverkit
+#define CONFIG_LARGE_CACHE 1
+#elif MALLOC_TARGET_IOS
+// all other embedded
 #define CONFIG_LARGE_CACHE 0
 #else
+// Mac
 #define CONFIG_LARGE_CACHE 1
 #endif
 
 #if CONFIG_LARGE_CACHE
+
+#if MALLOC_TARGET_IOS && MALLOC_TARGET_64BIT
+#define DEFAULT_LARGE_CACHE_ENABLED false
+#define CONFIG_DEFERRED_RECLAIM 1
+
+#elif TARGET_OS_SIMULATOR || (MALLOC_TARGET_IOS && !MALLOC_TARGET_64BIT)
+#define DEFAULT_LARGE_CACHE_ENABLED false
+#define CONFIG_DEFERRED_RECLAIM 0
+
+#else // TARGET_OS_SIMULATOR || (MALLOC_TARGET_IOS && !MALLOC_TARGET_64BIT)
 #define DEFAULT_LARGE_CACHE_ENABLED true
-#endif
+#define CONFIG_DEFERRED_RECLAIM 0
+
+#endif // TARGET_OS_SIMULATOR || (MALLOC_TARGET_IOS && !MALLOC_TARGET_64BIT)
+
+#else // CONFIG_LARGE_CACHE
+#define  CONFIG_DEFERRED_RECLAIM 0
+
+#endif // CONFIG_LARGE_CACHE
 
 #if MALLOC_TARGET_IOS
 // The VM system on iOS forces malloc-tagged memory to never be marked as
@@ -125,9 +192,59 @@
 // presence of commpage number of cpu count
 #define CONFIG_HAS_COMMPAGE_NCPUS 1
 
+// Distribute magazines by cluster number if nmagazines == nclusters
+#if (TARGET_OS_IOS && !TARGET_OS_SIMULATOR) || \
+		MALLOC_TARGET_DK_IOS || \
+		TARGET_OS_OSX || MALLOC_TARGET_DK_OSX
+#define CONFIG_MAGAZINE_PER_CLUSTER 1
+#else
+#define CONFIG_MAGAZINE_PER_CLUSTER 0
+#endif
+
+
 // 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
+#define CONFIG_SZONE_USES_HYPER_SHIFT 0
+
+#if TARGET_OS_OSX
+#define CONFIG_CHECK_PLATFORM_BINARY 1
+#else
+#define CONFIG_CHECK_PLATFORM_BINARY 0
+#endif
+
+#define CONFIG_CHECK_SECURITY_POLICY 1
+
+#define MALLOC_ZERO_POLICY_DEFAULT MALLOC_ZERO_ON_FREE
+
+
+#ifndef MALLOC_XZONE_ENABLED_DEFAULT
+#define MALLOC_XZONE_ENABLED_DEFAULT false
+#endif
+
+#if MALLOC_TARGET_64BIT
+#define CONFIG_EARLY_MALLOC 1
+#else
+#define CONFIG_EARLY_MALLOC 0
+#endif
+
+#if TARGET_OS_IOS
+#define MALLOC_TARGET_IOS_ONLY 1
+#else
+#define MALLOC_TARGET_IOS_ONLY 0
+#endif
+
+
+#if MALLOC_TARGET_IOS_ONLY || TARGET_OS_OSX
+#define CONFIG_MALLOC_PROCESS_IDENTITY 1
+#else
+#define CONFIG_MALLOC_PROCESS_IDENTITY 0
+#endif
+
+#ifndef CONFIG_SANITIZER
+#define CONFIG_SANITIZER 1
+#endif
+
+#define MALLOC_SECURE_ALLOCATOR_LAUNCHD_ENABLED_DEFAULT true
+
 
 #endif // __PLATFORM_H