Update harfbuzz-ng to 0.9.27

third_party/harfbuzz-ng/src/hb-atomic-private.hh

 /*
  * Copyright © 2007  Chris Wilson
  * Copyright © 2009,2010  Red Hat, Inc.
  * Copyright © 2011,2012  Google, Inc.
  *
  *  This is part of HarfBuzz, a text shaping library.
  *
  * Permission is hereby granted, without written agreement and without
  * license or royalty fees, to use, copy, modify, and distribute this
  * software and its documentation for any purpose, provided that the
@@ skipping 29 matching lines @@
 /* We need external help for these */
 
 #if 0
 
 
 #elif !defined(HB_NO_MT) && (defined(_WIN32) || defined(__CYGWIN__))
 
 #define WIN32_LEAN_AND_MEAN
 #include <windows.h>
 
-#if defined(__MINGW32__) && !defined(MemoryBarrier)
+/* MinGW has a convoluted history of supporting MemoryBarrier
+ * properly.  As such, define a function to wrap the whole
+ * thing. */
 static inline void _HBMemoryBarrier (void) {
+#if !defined(MemoryBarrier)
   long dummy = 0;
   InterlockedExchange (&dummy, 1);
+#else
+  MemoryBarrier ();
+#endif
 }
-# define MemoryBarrier _HBMemoryBarrier
-#endif
 
 typedef LONG hb_atomic_int_t;
 #define hb_atomic_int_add(AI, V)        InterlockedExchangeAdd (&(AI), (V))
 
-#define hb_atomic_ptr_get(P)            (MemoryBarrier (), (void *) *(P))
+#define hb_atomic_ptr_get(P)            (_HBMemoryBarrier (), (void *) *(P))
 #define hb_atomic_ptr_cmpexch(P,O,N)    (InterlockedCompareExchangePointer ((void **) (P), (void *) (N), (void *) (O)) == (void *) (O))
 
 
 #elif !defined(HB_NO_MT) && defined(__APPLE__)
 
 #include <libkern/OSAtomic.h>
 #ifdef __MAC_OS_X_MIN_REQUIRED
 #include <AvailabilityMacros.h>
 #elif defined(__IPHONE_OS_MIN_REQUIRED)
 #include <Availability.h>
 #endif
 
 typedef int32_t hb_atomic_int_t;
 #define hb_atomic_int_add(AI, V)        (OSAtomicAdd32Barrier ((V), &(AI)) - (V))
 
 #define hb_atomic_ptr_get(P)            (OSMemoryBarrier (), (void *) *(P))
 #if (MAC_OS_X_VERSION_MIN_REQUIRED > MAC_OS_X_VERSION_10_4 || __IPHONE_VERSION_MIN_REQUIRED >= 20100)
 #define hb_atomic_ptr_cmpexch(P,O,N)    OSAtomicCompareAndSwapPtrBarrier ((void *) (O), (void *) (N), (void **) (P))
 #else
-#if __ppc64__ || __x86_64__
+#if __ppc64__ || __x86_64__ || __arm64__
 #define hb_atomic_ptr_cmpexch(P,O,N)    OSAtomicCompareAndSwap64Barrier ((int64_t) (O), (int64_t) (N), (int64_t*) (P))
 #else
 #define hb_atomic_ptr_cmpexch(P,O,N)    OSAtomicCompareAndSwap32Barrier ((int32_t) (O), (int32_t) (N), (int32_t*) (P))
 #endif
 #endif
 
 
 #elif !defined(HB_NO_MT) && defined(HAVE_INTEL_ATOMIC_PRIMITIVES)
 
 typedef int hb_atomic_int_t;
@@ skipping 31 matching lines @@
 #define hb_atomic_int_add(AI, V)        (((AI) += (V)) - (V))
 
 #define hb_atomic_ptr_get(P)            ((void *) *(P))
 #define hb_atomic_ptr_cmpexch(P,O,N)    (* (void **) (P) == (void *) (O) ? (* (void **) (P) = (void *) (N), true) : false)
 
 #endif
 
 /* TODO Add tracing. */
 
 #endif /* HB_ATOMIC_PRIVATE_HH */