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Side by Side Diff: src/platform-tls-win32.h

Issue 6696112: Fast TLS support.
Patch Set: Created 9 years, 9 months ago
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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;
antonm 2011/03/25 16:44:44 nit: do not we use lower case in hex constants?
Vitaly Repeshko 2011/03/27 15:54:48 Upper case seems to be more common.
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_
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