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// Copyright 2011 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
// with the distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived
// from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#ifndef V8_PLATFORM_TLS_WIN32_H_
#define V8_PLATFORM_TLS_WIN32_H_
#include "checks.h"
#include "globals.h"
#include "win32-headers.h"
namespace v8 {
namespace internal {
#if defined(_WIN32) && !defined(_WIN64)
#define V8_FAST_TLS_SUPPORTED 1
inline intptr_t InternalGetExistingThreadLocal(intptr_t index) {
const intptr_t kTibInlineTlsOffset = 0xE10;
const intptr_t kTibExtraTlsOffset = 0xF94;
const intptr_t kMaxInlineSlots = 64;
const intptr_t kMaxSlots = kMaxInlineSlots + 1024;
ASSERT(0 <= index && index < kMaxSlots);
if (index < kMaxInlineSlots) {
return static_cast<intptr_t>(__readfsdword(kTibInlineTlsOffset +
kPointerSize * index));
}
intptr_t extra = static_cast<intptr_t>(__readfsdword(kTibExtraTlsOffset));
ASSERT(extra != 0);
return *reinterpret_cast<intptr_t*>(extra +
kPointerSize * (index - kMaxInlineSlots));
}
#endif
} } // namespace v8::internal
#endif // V8_PLATFORM_TLS_WIN32_H_
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