Revert "[Arguments] Merge (7442,7496] from bleeding_edge."

src/platform-macos.cc

Index: src/platform-macos.cc
diff --git a/src/platform-macos.cc b/src/platform-macos.cc
index bfdf3b21c0ff1ef38c3f663049626f9cfa6ef61b..17e3042882f183047f45078f7dca1929d061a007 100644
--- a/src/platform-macos.cc
+++ b/src/platform-macos.cc
@@ -48,10 +48,8 @@
 #include <sys/time.h>
 #include <sys/resource.h>
 #include <sys/types.h>
-#include <sys/sysctl.h>
 #include <stdarg.h>
 #include <stdlib.h>
-#include <string.h>
 #include <errno.h>
 
 #undef MAP_TYPE
@@ -509,79 +507,12 @@ void Thread::Join() {
 }
 
 
-#ifdef V8_FAST_TLS_SUPPORTED
-
-static Atomic32 tls_base_offset_initialized = 0;
-intptr_t kMacTlsBaseOffset = 0;
-
-// It's safe to do the initialization more that once, but it has to be
-// done at least once.
-static void InitializeTlsBaseOffset() {
-  const size_t kBufferSize = 128;
-  char buffer[kBufferSize];
-  size_t buffer_size = kBufferSize;
-  int ctl_name[] = { CTL_KERN , KERN_OSRELEASE };
-  if (sysctl(ctl_name, 2, buffer, &buffer_size, NULL, 0) != 0) {
-    V8_Fatal(__FILE__, __LINE__, "V8 failed to get kernel version");
-  }
-  // The buffer now contains a string of the form XX.YY.ZZ, where
-  // XX is the major kernel version component.
-  // Make sure the buffer is 0-terminated.
-  buffer[kBufferSize - 1] = '\0';
-  char* period_pos = strchr(buffer, '.');
-  *period_pos = '\0';
-  int kernel_version_major =
-      static_cast<int>(strtol(buffer, NULL, 10));  // NOLINT
-  // The constants below are taken from pthreads.s from the XNU kernel
-  // sources archive at www.opensource.apple.com.
-  if (kernel_version_major < 11) {
-    // 8.x.x (Tiger), 9.x.x (Leopard), 10.x.x (Snow Leopard) have the
-    // same offsets.
-#if defined(V8_HOST_ARCH_IA32)
-    kMacTlsBaseOffset = 0x48;
-#else
-    kMacTlsBaseOffset = 0x60;
-#endif
-  } else {
-    // 11.x.x (Lion) changed the offset.
-    kMacTlsBaseOffset = 0;
-  }
-
-  Release_Store(&tls_base_offset_initialized, 1);
-}
-
-static void CheckFastTls(Thread::LocalStorageKey key) {
-  void* expected = reinterpret_cast<void*>(0x1234CAFE);
-  Thread::SetThreadLocal(key, expected);
-  void* actual = Thread::GetExistingThreadLocal(key);
-  if (expected != actual) {
-    V8_Fatal(__FILE__, __LINE__,
-             "V8 failed to initialize fast TLS on current kernel");
-  }
-  Thread::SetThreadLocal(key, NULL);
-}
-
-#endif  // V8_FAST_TLS_SUPPORTED
-
-
 Thread::LocalStorageKey Thread::CreateThreadLocalKey() {
-#ifdef V8_FAST_TLS_SUPPORTED
-  bool check_fast_tls = false;
-  if (tls_base_offset_initialized == 0) {
-    check_fast_tls = true;
-    InitializeTlsBaseOffset();
-  }
-#endif
   pthread_key_t key;
   int result = pthread_key_create(&key, NULL);
   USE(result);
   ASSERT(result == 0);
-  LocalStorageKey typed_key = static_cast<LocalStorageKey>(key);
-#ifdef V8_FAST_TLS_SUPPORTED
-  // If we just initialized fast TLS support, make sure it works.
-  if (check_fast_tls) CheckFastTls(typed_key);
-#endif
-  return typed_key;
+  return static_cast<LocalStorageKey>(key);
 }