src/platform-tls-mac.h

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#ifndef V8_PLATFORM_TLS_MAC_H_
#define V8_PLATFORM_TLS_MAC_H_

#include "globals.h"

namespace v8 {
namespace internal {

#if defined(V8_HOST_ARCH_IA32) || defined(V8_HOST_ARCH_X64)

#define V8_FAST_TLS_SUPPORTED 1

extern intptr_t kMacTlsBaseOffset;

INLINE(intptr_t InternalGetExistingThreadLocal(intptr_t index));

inline intptr_t InternalGetExistingThreadLocal(intptr_t index) {
  intptr_t result;
#if defined(V8_HOST_ARCH_IA32)
  asm("movl %%gs:(%1,%2,4), %0;"
      :"=r"(result)  // Output must be a writable register.
      :"r"(kMacTlsBaseOffset), "r"(index));
#else
  asm("movq %%gs:(%1,%2,8), %0;"
      :"=r"(result)
      :"r"(kMacTlsBaseOffset), "r"(index));
#endif
  return result;
}

#endif

} }  // namespace v8::internal

#endif  // V8_PLATFORM_TLS_MAC_H_