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platform-tls-win32.h
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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 
35 namespace v8 {
36 namespace internal {
37 
38 #if defined(_WIN32) && !defined(_WIN64)
39 
40 #define V8_FAST_TLS_SUPPORTED 1
41 
42 inline 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_
#define ASSERT(condition)
Definition: checks.h:270
const int kPointerSize
Definition: globals.h:220