Introduced Atomic8 and added no-barrier Atomic8 accessors.

src/atomicops.h

 // Copyright 2010 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 45 matching lines @@
 // public API also uses MemoryBarrier at the public name for this fence. So, on
 // X64, undef it, and call its documented
 // (http://msdn.microsoft.com/en-us/library/windows/desktop/ms684208.aspx)
 // implementation directly.
 #undef MemoryBarrier
 #endif
 
 namespace v8 {
 namespace internal {
 
+typedef char Atomic8;
 typedef int32_t Atomic32;
 #ifdef V8_HOST_ARCH_64_BIT
 // We need to be able to go between Atomic64 and AtomicWord implicitly.  This
 // means Atomic64 and AtomicWord should be the same type on 64-bit.
 #if defined(__ILP32__)
 typedef int64_t Atomic64;
 #else
 typedef intptr_t Atomic64;
 #endif
 #endif
@@ skipping 37 matching lines @@
 // semantics.   A MemoryBarrier() has "Barrier" semantics, but does no memory
 // access.
 Atomic32 Acquire_CompareAndSwap(volatile Atomic32* ptr,
                                 Atomic32 old_value,
                                 Atomic32 new_value);
 Atomic32 Release_CompareAndSwap(volatile Atomic32* ptr,
                                 Atomic32 old_value,
                                 Atomic32 new_value);
 
 void MemoryBarrier();
+void NoBarrier_Store(volatile Atomic8* ptr, Atomic8 value);
 void NoBarrier_Store(volatile Atomic32* ptr, Atomic32 value);
 void Acquire_Store(volatile Atomic32* ptr, Atomic32 value);
 void Release_Store(volatile Atomic32* ptr, Atomic32 value);
 
+Atomic8 NoBarrier_Load(volatile const Atomic8* ptr);
 Atomic32 NoBarrier_Load(volatile const Atomic32* ptr);
 Atomic32 Acquire_Load(volatile const Atomic32* ptr);
 Atomic32 Release_Load(volatile const Atomic32* ptr);
 
 // 64-bit atomic operations (only available on 64-bit processors).
 #ifdef V8_HOST_ARCH_64_BIT
 Atomic64 NoBarrier_CompareAndSwap(volatile Atomic64* ptr,
                                   Atomic64 old_value,
                                   Atomic64 new_value);
 Atomic64 NoBarrier_AtomicExchange(volatile Atomic64* ptr, Atomic64 new_value);
@@ skipping 35 matching lines @@
 #error "Atomic operations are not supported on your platform"
 #endif
 
 // On some platforms we need additional declarations to make
 // AtomicWord compatible with our other Atomic* types.
 #if defined(__APPLE__) || defined(__OpenBSD__)
 #include "atomicops_internals_atomicword_compat.h"
 #endif
 
 #endif  // V8_ATOMICOPS_H_