1// Copyright 2011 the V8 project authors. All rights reserved.
2// Redistribution and use in source and binary forms, with or without
3// modification, are permitted provided that the following conditions are
4// met:
5//
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8//     * Redistributions in binary form must reproduce the above
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11//       with the distribution.
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15//
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27
28#ifndef V8_PLATFORM_TLS_WIN32_H_
29#define V8_PLATFORM_TLS_WIN32_H_
30
31#include "checks.h"
32#include "globals.h"
33#include "win32-headers.h"
34
35namespace v8 {
36namespace internal {
37
38#if defined(_WIN32) && !defined(_WIN64)
39
40#define V8_FAST_TLS_SUPPORTED 1
41
42inline intptr_t InternalGetExistingThreadLocal(intptr_t index) {
43  const intptr_t kTibInlineTlsOffset = 0xE10;
44  const intptr_t kTibExtraTlsOffset = 0xF94;
45  const intptr_t kMaxInlineSlots = 64;
46  const intptr_t kMaxSlots = kMaxInlineSlots + 1024;
47  ASSERT(0 <= index && index < kMaxSlots);
48  if (index < kMaxInlineSlots) {
49    return static_cast<intptr_t>(__readfsdword(kTibInlineTlsOffset +
50                                               kPointerSize * index));
51  }
52  intptr_t extra = static_cast<intptr_t>(__readfsdword(kTibExtraTlsOffset));
53  ASSERT(extra != 0);
54  return *reinterpret_cast<intptr_t*>(extra +
55                                      kPointerSize * (index - kMaxInlineSlots));
56}
57
58#endif
59
60} }  // namespace v8::internal
61
62#endif  // V8_PLATFORM_TLS_WIN32_H_
63