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      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 //
      6 //     * Redistributions of source code must retain the above copyright
      7 //       notice, this list of conditions and the following disclaimer.
      8 //     * Redistributions in binary form must reproduce the above
      9 //       copyright notice, this list of conditions and the following
     10 //       disclaimer in the documentation and/or other materials provided
     11 //       with the distribution.
     12 //     * Neither the name of Google Inc. nor the names of its
     13 //       contributors may be used to endorse or promote products derived
     14 //       from this software without specific prior written permission.
     15 //
     16 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     17 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     18 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     19 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     20 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     21 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     22 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     23 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     24 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     25 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     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_
     63