Fast TLS support.

src/platform.h

 // Copyright 2006-2008 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 96 matching lines @@
 // __GNUC_PREREQ is not defined in GCC for Mac OS X, so we define our own macro
 #if __GNUC_VERSION__ >= 29600 && __GNUC_VERSION__ < 40100
 #include <limits>
 #undef V8_INFINITY
 #define V8_INFINITY std::numeric_limits<double>::infinity()
 #endif
 
 #endif  // __GNUC__
 
 #include "atomicops.h"
+#include "platform-tls.h"
 #include "utils.h"
 #include "v8globals.h"
 
 namespace v8 {
 namespace internal {
 
 // Use AtomicWord for a machine-sized pointer. It is assumed that
 // reads and writes of naturally aligned values of this type are atomic.
 typedef intptr_t AtomicWord;
 
@@ skipping 294 matching lines @@
     return static_cast<int>(reinterpret_cast<intptr_t>(GetThreadLocal(key)));
   }
   static void SetThreadLocal(LocalStorageKey key, void* value);
   static void SetThreadLocalInt(LocalStorageKey key, int value) {
     SetThreadLocal(key, reinterpret_cast<void*>(static_cast<intptr_t>(value)));
   }
   static bool HasThreadLocal(LocalStorageKey key) {
     return GetThreadLocal(key) != NULL;
   }
 
+#ifdef V8_FAST_TLS_SUPPORTED
+  static inline void* GetExistingThreadLocal(LocalStorageKey key) {

[antonm, 2011/03/25 16:44:44]

maybe make this method a template by a return type?

[Vitaly Repeshko, 2011/03/27 15:54:48]

I'd like to avoid significant interface changes in this patch.

+    void* result = reinterpret_cast<void*>(
+        InternalGetExistingThreadLocal(static_cast<intptr_t>(key)));
+    ASSERT(result == GetThreadLocal(key));
+    return result;
+  }
+#else
+  static inline void* GetExistingThreadLocal(LocalStorageKey key) {
+    return GetThreadLocal(key);
+  }
+#endif
+
   // A hint to the scheduler to let another thread run.
   static void YieldCPU();
 
   Isolate* isolate() const { return isolate_; }
 
   // The thread name length is limited to 16 based on Linux's implementation of
   // prctl().
   static const int kMaxThreadNameLength = 16;
  private:
   void set_name(const char *name);
@@ skipping 210 matching lines @@
   int samples_taken_;  // Counts stack samples taken.
   DISALLOW_IMPLICIT_CONSTRUCTORS(Sampler);
 };
 
 
 #endif  // ENABLE_LOGGING_AND_PROFILING
 
 } }  // namespace v8::internal
 
 #endif  // V8_PLATFORM_H_