text: // Copyright 2011 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
  //       with the distribution.
  //     * Neither the name of Google Inc. nor the names of its
  //       contributors may be used to endorse or promote products derived
  //       from this software without specific prior written permission.
  //
  // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  
  #ifndef V8_PLATFORM_TLS_MAC_H_
  #define V8_PLATFORM_TLS_MAC_H_
  
  #include "globals.h"
  
  namespace v8 {
  namespace internal {
  
  #if V8_HOST_ARCH_IA32 || 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 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_
  