--- /dev/null
+++ libmalloc/libmalloc-409.81.2/src/platform.h
@@ -0,0 +1,179 @@
+/*
+ * Copyright (c) 2015 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@
+ */
+
+#ifndef __PLATFORM_H
+#define __PLATFORM_H
+
+#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) || (TARGET_OS_DRIVERKIT && !MALLOC_TARGET_DK_OSX)
+#define MALLOC_TARGET_IOS 0
+#endif // (TARGET_OS_IPHONE && !TARGET_OS_SIMULATOR) || (TARGET_OS_DRIVERKIT && !MALLOC_TARGET_DK_OSX)
+
+#ifdef __LP64__
+#define MALLOC_TARGET_64BIT 1
+#else // __LP64__
+#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
+
+// <rdar://problem/12596555>
+#define CONFIG_RECIRC_DEPOT 1
+#define CONFIG_AGGRESSIVE_MADVISE 1
+
+#if MALLOC_TARGET_IOS
+# define DEFAULT_AGGRESSIVE_MADVISE_ENABLED true
+#else // MALLOC_TARGET_IOS
+# define DEFAULT_AGGRESSIVE_MADVISE_ENABLED false
+#endif // MALLOC_TARGET_IOS
+
+// <rdar://problem/10397726>
+#define CONFIG_RELAXED_INVARIANT_CHECKS 1
+
+// <rdar://problem/19818071>
+#define CONFIG_MADVISE_STYLE MADV_FREE_REUSABLE
+
+#if MALLOC_TARGET_64BIT
+#define CONFIG_NANOZONE 1
+#define CONFIG_ASLR_INTERNAL 0
+#else // MALLOC_TARGET_64BIT
+#define CONFIG_NANOZONE 0
+#define CONFIG_ASLR_INTERNAL 1
+#endif // MALLOC_TARGET_64BIT
+
+// 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
+#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 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
+#define CONFIG_DEFERRED_RECLAIM 0
+
+#endif // TARGET_OS_SIMULATOR || (MALLOC_TARGET_IOS && !MALLOC_TARGET_64BIT)
+#endif // CONFIG_LARGE_CACHE
+
+#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
+#else
+#define CONFIG_REALLOC_CAN_USE_VMCOPY 1
+#endif
+
+// memory resource exception handling
+#if MALLOC_TARGET_IOS || TARGET_OS_SIMULATOR
+#define ENABLE_MEMORY_RESOURCE_EXCEPTION_HANDLING 0
+#else
+#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
+
+// 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
+
+// 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
+
+
+#ifndef MALLOC_ZERO_POLICY_DEFAULT
+#define MALLOC_ZERO_POLICY_DEFAULT MALLOC_ZERO_ON_FREE
+#endif
+
+#endif // __PLATFORM_H