--- libmalloc/libmalloc-166.251.2/src/platform.h
+++ libmalloc/libmalloc-374.100.5/src/platform.h
@@ -44,12 +44,13 @@
 #endif // MALLOC_TARGET_IOS
 
 // <rdar://problem/12596555>
+#define CONFIG_RECIRC_DEPOT 1
+#define CONFIG_AGGRESSIVE_MADVISE 1
+
 #if MALLOC_TARGET_IOS
-# define CONFIG_RECIRC_DEPOT 1
-# define CONFIG_AGGRESSIVE_MADVISE 1
+# define DEFAULT_AGGRESSIVE_MADVISE_ENABLED true
 #else // MALLOC_TARGET_IOS
-# define CONFIG_RECIRC_DEPOT 1
-# define CONFIG_AGGRESSIVE_MADVISE 0
+# define DEFAULT_AGGRESSIVE_MADVISE_ENABLED false
 #endif // MALLOC_TARGET_IOS
 
 // <rdar://problem/10397726>
@@ -69,6 +70,15 @@
 // 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
+
+
 // 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
@@ -79,7 +89,7 @@
 #if MALLOC_TARGET_IOS
 #define CONFIG_MEDIUM_ALLOCATOR 0
 #else // MALLOC_TARGET_IOS
-#define CONFIG_MEDIUM_ALLOCATOR 0
+#define CONFIG_MEDIUM_ALLOCATOR 1
 #endif // MALLOC_TARGET_IOS
 #else // MALLOC_TARGET_64BIT
 #define CONFIG_MEDIUM_ALLOCATOR 0
@@ -90,6 +100,10 @@
 #define CONFIG_LARGE_CACHE 0
 #else
 #define CONFIG_LARGE_CACHE 1
+#endif
+
+#if CONFIG_LARGE_CACHE
+#define DEFAULT_LARGE_CACHE_ENABLED true
 #endif
 
 #if MALLOC_TARGET_IOS
@@ -108,6 +122,19 @@
 #define ENABLE_MEMORY_RESOURCE_EXCEPTION_HANDLING 1
 #endif
 
+#if !TARGET_OS_DRIVERKIT && (!TARGET_OS_OSX || MALLOC_TARGET_64BIT)
+#define CONFIG_FEATUREFLAGS_SIMPLE 1
+#else
+#define CONFIG_FEATUREFLAGS_SIMPLE 0
+#endif
+
+// Quarantine zone, only useful on macOS (+ DriverKit, 64-bit simulators).
+#if (TARGET_OS_OSX || TARGET_OS_DRIVERKIT || TARGET_OS_SIMULATOR) && MALLOC_TARGET_64BIT
+#define CONFIG_QUARANTINE 1
+#else
+#define CONFIG_QUARANTINE 0
+#endif
+
 // presence of commpage memsize
 #define CONFIG_HAS_COMMPAGE_MEMSIZE 1
 
@@ -119,4 +146,11 @@
 #define CONFIG_TINY_USES_HYPER_SHIFT 0
 #define CONFIG_SMALL_USES_HYPER_SHIFT 0
 
+// FIXME: limit number of malloc_create_zone() wrapper zones for watchOS to remove this
+#if TARGET_OS_OSX || TARGET_OS_IOS
+#define CONFIG_PGM_WRAP_CUSTOM_ZONES 1
+#else
+#define CONFIG_PGM_WRAP_CUSTOM_ZONES 0
+#endif
+
 #endif // __PLATFORM_H