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Diffstat (limited to 'Source/JavaScriptCore/wtf/Atomics.h')
| -rw-r--r-- | Source/JavaScriptCore/wtf/Atomics.h | 200 |
1 files changed, 0 insertions, 200 deletions
diff --git a/Source/JavaScriptCore/wtf/Atomics.h b/Source/JavaScriptCore/wtf/Atomics.h deleted file mode 100644 index d30926897..000000000 --- a/Source/JavaScriptCore/wtf/Atomics.h +++ /dev/null @@ -1,200 +0,0 @@ -/* - * Copyright (C) 2007, 2008, 2010 Apple Inc. All rights reserved. - * Copyright (C) 2007 Justin Haygood (jhaygood@reaktix.com) - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * 2. 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. - * 3. Neither the name of Apple Computer, Inc. ("Apple") 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 APPLE AND ITS 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 APPLE OR ITS 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. - * - * - * Note: The implementations of InterlockedIncrement and InterlockedDecrement are based - * on atomic_increment and atomic_exchange_and_add from the Boost C++ Library. The license - * is virtually identical to the Apple license above but is included here for completeness. - * - * Boost Software License - Version 1.0 - August 17th, 2003 - * - * Permission is hereby granted, free of charge, to any person or organization - * obtaining a copy of the software and accompanying documentation covered by - * this license (the "Software") to use, reproduce, display, distribute, - * execute, and transmit the Software, and to prepare derivative works of the - * Software, and to permit third-parties to whom the Software is furnished to - * do so, all subject to the following: - * - * The copyright notices in the Software and this entire statement, including - * the above license grant, this restriction and the following disclaimer, - * must be included in all copies of the Software, in whole or in part, and - * all derivative works of the Software, unless such copies or derivative - * works are solely in the form of machine-executable object code generated by - * a source language processor. - * - * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR - * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, - * FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT - * SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE - * FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE, - * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER - * DEALINGS IN THE SOFTWARE. - */ - -#ifndef Atomics_h -#define Atomics_h - -#include <wtf/Platform.h> -#include <wtf/StdLibExtras.h> -#include <wtf/UnusedParam.h> - -#if OS(WINDOWS) -#include <windows.h> -#elif OS(DARWIN) -#include <libkern/OSAtomic.h> -#elif OS(QNX) -#include <atomic.h> -#elif OS(ANDROID) -#include <sys/atomics.h> -#elif COMPILER(GCC) -#if (__GNUC__ > 4) || ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 2)) -#include <ext/atomicity.h> -#else -#include <bits/atomicity.h> -#endif -#endif - -namespace WTF { - -#if OS(WINDOWS) -#define WTF_USE_LOCKFREE_THREADSAFEREFCOUNTED 1 - -#if COMPILER(MINGW) || COMPILER(MSVC7_OR_LOWER) || OS(WINCE) -inline int atomicIncrement(int* addend) { return InterlockedIncrement(reinterpret_cast<long*>(addend)); } -inline int atomicDecrement(int* addend) { return InterlockedDecrement(reinterpret_cast<long*>(addend)); } -#else -inline int atomicIncrement(int volatile* addend) { return InterlockedIncrement(reinterpret_cast<long volatile*>(addend)); } -inline int atomicDecrement(int volatile* addend) { return InterlockedDecrement(reinterpret_cast<long volatile*>(addend)); } -#endif - -#elif OS(DARWIN) -#define WTF_USE_LOCKFREE_THREADSAFEREFCOUNTED 1 - -inline int atomicIncrement(int volatile* addend) { return OSAtomicIncrement32Barrier(const_cast<int*>(addend)); } -inline int atomicDecrement(int volatile* addend) { return OSAtomicDecrement32Barrier(const_cast<int*>(addend)); } - -#elif OS(QNX) -#define WTF_USE_LOCKFREE_THREADSAFEREFCOUNTED 1 - -// Note, atomic_{add, sub}_value() return the previous value of addend's content. -inline int atomicIncrement(int volatile* addend) { return static_cast<int>(atomic_add_value(reinterpret_cast<unsigned volatile*>(addend), 1)) + 1; } -inline int atomicDecrement(int volatile* addend) { return static_cast<int>(atomic_sub_value(reinterpret_cast<unsigned volatile*>(addend), 1)) - 1; } - -#elif OS(ANDROID) - -inline int atomicIncrement(int volatile* addend) { return __atomic_inc(addend); } -inline int atomicDecrement(int volatile* addend) { return __atomic_dec(addend); } - -#elif COMPILER(GCC) && !CPU(SPARC64) // sizeof(_Atomic_word) != sizeof(int) on sparc64 gcc -#define WTF_USE_LOCKFREE_THREADSAFEREFCOUNTED 1 - -inline int atomicIncrement(int volatile* addend) { return __gnu_cxx::__exchange_and_add(addend, 1) + 1; } -inline int atomicDecrement(int volatile* addend) { return __gnu_cxx::__exchange_and_add(addend, -1) - 1; } - -#endif - -#if COMPILER(GCC) && !COMPILER(CLANG) // Work around a gcc bug -inline bool weakCompareAndSwap(volatile unsigned* location, unsigned expected, unsigned newValue) -#else -inline bool weakCompareAndSwap(unsigned* location, unsigned expected, unsigned newValue) -#endif -{ -#if ENABLE(COMPARE_AND_SWAP) - bool result; -#if CPU(X86) || CPU(X86_64) - asm volatile( - "lock; cmpxchgl %3, %2\n\t" - "sete %1" - : "+a"(expected), "=q"(result), "+m"(*location) - : "r"(newValue) - : "memory" - ); -#elif CPU(ARM_THUMB2) - unsigned tmp; - asm volatile( - "movw %1, #1\n\t" - "ldrex %2, %0\n\t" - "cmp %3, %2\n\t" - "bne.n 0f\n\t" - "strex %1, %4, %0\n\t" - "0:" - : "+m"(*location), "=&r"(result), "=&r"(tmp) - : "r"(expected), "r"(newValue) - : "memory"); - result = !result; -#else -#error "Bad architecture for compare and swap." -#endif - return result; -#else - UNUSED_PARAM(location); - UNUSED_PARAM(expected); - UNUSED_PARAM(newValue); - CRASH(); - return 0; -#endif -} - -inline bool weakCompareAndSwap(void*volatile* location, void* expected, void* newValue) -{ -#if ENABLE(COMPARE_AND_SWAP) -#if CPU(X86_64) - bool result; - asm volatile( - "lock; cmpxchgq %3, %2\n\t" - "sete %1" - : "+a"(expected), "=q"(result), "+m"(*location) - : "r"(newValue) - : "memory" - ); - return result; -#else - return weakCompareAndSwap(bitwise_cast<unsigned*>(location), bitwise_cast<unsigned>(expected), bitwise_cast<unsigned>(newValue)); -#endif -#else // ENABLE(COMPARE_AND_SWAP) - UNUSED_PARAM(location); - UNUSED_PARAM(expected); - UNUSED_PARAM(newValue); - CRASH(); - return 0; -#endif // ENABLE(COMPARE_AND_SWAP) -} - -inline bool weakCompareAndSwapUIntPtr(volatile uintptr_t* location, uintptr_t expected, uintptr_t newValue) -{ - return weakCompareAndSwap(reinterpret_cast<void*volatile*>(location), reinterpret_cast<void*>(expected), reinterpret_cast<void*>(newValue)); -} - -} // namespace WTF - -#if USE(LOCKFREE_THREADSAFEREFCOUNTED) -using WTF::atomicDecrement; -using WTF::atomicIncrement; -#endif - -#endif // Atomics_h |