Squashed 'third_party/gperftools/' content from commit 54505f1
Change-Id: Id02e833828732b0efe7dac722b8485279e67c5fa
git-subtree-dir: third_party/gperftools
git-subtree-split: 54505f1d50c2d1f4676f5e87090b64a117fd980e
diff --git a/src/base/atomicops-internals-gcc.h b/src/base/atomicops-internals-gcc.h
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+// -*- Mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*-
+// Copyright (c) 2014, Linaro
+// 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.
+// ---
+//
+// Author: Riku Voipio, riku.voipio@linaro.org
+//
+// atomic primitives implemented with gcc atomic intrinsics:
+// http://gcc.gnu.org/onlinedocs/gcc/_005f_005fatomic-Builtins.html
+//
+
+#ifndef BASE_ATOMICOPS_INTERNALS_GCC_GENERIC_H_
+#define BASE_ATOMICOPS_INTERNALS_GCC_GENERIC_H_
+
+#include <stdio.h>
+#include <stdlib.h>
+#include "base/basictypes.h"
+
+typedef int32_t Atomic32;
+
+namespace base {
+namespace subtle {
+
+typedef int64_t Atomic64;
+
+inline void MemoryBarrier() {
+ __sync_synchronize();
+}
+
+inline Atomic32 NoBarrier_CompareAndSwap(volatile Atomic32* ptr,
+ Atomic32 old_value,
+ Atomic32 new_value) {
+ Atomic32 prev_value = old_value;
+ __atomic_compare_exchange_n(ptr, &prev_value, new_value,
+ 0, __ATOMIC_RELAXED, __ATOMIC_RELAXED);
+ return prev_value;
+}
+
+inline Atomic32 NoBarrier_AtomicExchange(volatile Atomic32* ptr,
+ Atomic32 new_value) {
+ return __atomic_exchange_n(const_cast<Atomic32*>(ptr), new_value, __ATOMIC_RELAXED);
+}
+
+inline Atomic32 Acquire_AtomicExchange(volatile Atomic32* ptr,
+ Atomic32 new_value) {
+ return __atomic_exchange_n(const_cast<Atomic32*>(ptr), new_value, __ATOMIC_ACQUIRE);
+}
+
+inline Atomic32 Release_AtomicExchange(volatile Atomic32* ptr,
+ Atomic32 new_value) {
+ return __atomic_exchange_n(const_cast<Atomic32*>(ptr), new_value, __ATOMIC_RELEASE);
+}
+
+inline Atomic32 Acquire_CompareAndSwap(volatile Atomic32* ptr,
+ Atomic32 old_value,
+ Atomic32 new_value) {
+ Atomic32 prev_value = old_value;
+ __atomic_compare_exchange_n(ptr, &prev_value, new_value,
+ 0, __ATOMIC_ACQUIRE, __ATOMIC_RELAXED);
+ return prev_value;
+}
+
+inline Atomic32 Release_CompareAndSwap(volatile Atomic32* ptr,
+ Atomic32 old_value,
+ Atomic32 new_value) {
+ Atomic32 prev_value = old_value;
+ __atomic_compare_exchange_n(ptr, &prev_value, new_value,
+ 0, __ATOMIC_RELEASE, __ATOMIC_RELAXED);
+ return prev_value;
+}
+
+inline void NoBarrier_Store(volatile Atomic32* ptr, Atomic32 value) {
+ *ptr = value;
+}
+
+inline void Acquire_Store(volatile Atomic32* ptr, Atomic32 value) {
+ *ptr = value;
+ MemoryBarrier();
+}
+
+inline void Release_Store(volatile Atomic32* ptr, Atomic32 value) {
+ MemoryBarrier();
+ *ptr = value;
+}
+
+inline Atomic32 NoBarrier_Load(volatile const Atomic32* ptr) {
+ return *ptr;
+}
+
+inline Atomic32 Acquire_Load(volatile const Atomic32* ptr) {
+ Atomic32 value = *ptr;
+ MemoryBarrier();
+ return value;
+}
+
+inline Atomic32 Release_Load(volatile const Atomic32* ptr) {
+ MemoryBarrier();
+ return *ptr;
+}
+
+// 64-bit versions
+
+inline Atomic64 NoBarrier_CompareAndSwap(volatile Atomic64* ptr,
+ Atomic64 old_value,
+ Atomic64 new_value) {
+ Atomic64 prev_value = old_value;
+ __atomic_compare_exchange_n(ptr, &prev_value, new_value,
+ 0, __ATOMIC_RELAXED, __ATOMIC_RELAXED);
+ return prev_value;
+}
+
+inline Atomic64 NoBarrier_AtomicExchange(volatile Atomic64* ptr,
+ Atomic64 new_value) {
+ return __atomic_exchange_n(const_cast<Atomic64*>(ptr), new_value, __ATOMIC_RELAXED);
+}
+
+inline Atomic64 Acquire_AtomicExchange(volatile Atomic64* ptr,
+ Atomic64 new_value) {
+ return __atomic_exchange_n(const_cast<Atomic64*>(ptr), new_value, __ATOMIC_ACQUIRE);
+}
+
+inline Atomic64 Release_AtomicExchange(volatile Atomic64* ptr,
+ Atomic64 new_value) {
+ return __atomic_exchange_n(const_cast<Atomic64*>(ptr), new_value, __ATOMIC_RELEASE);
+}
+
+inline Atomic64 Acquire_CompareAndSwap(volatile Atomic64* ptr,
+ Atomic64 old_value,
+ Atomic64 new_value) {
+ Atomic64 prev_value = old_value;
+ __atomic_compare_exchange_n(ptr, &prev_value, new_value,
+ 0, __ATOMIC_ACQUIRE, __ATOMIC_RELAXED);
+ return prev_value;
+}
+
+inline Atomic64 Release_CompareAndSwap(volatile Atomic64* ptr,
+ Atomic64 old_value,
+ Atomic64 new_value) {
+ Atomic64 prev_value = old_value;
+ __atomic_compare_exchange_n(ptr, &prev_value, new_value,
+ 0, __ATOMIC_RELEASE, __ATOMIC_RELAXED);
+ return prev_value;
+}
+
+inline void NoBarrier_Store(volatile Atomic64* ptr, Atomic64 value) {
+ *ptr = value;
+}
+
+inline void Acquire_Store(volatile Atomic64* ptr, Atomic64 value) {
+ *ptr = value;
+ MemoryBarrier();
+}
+
+inline void Release_Store(volatile Atomic64* ptr, Atomic64 value) {
+ MemoryBarrier();
+ *ptr = value;
+}
+
+inline Atomic64 NoBarrier_Load(volatile const Atomic64* ptr) {
+ return *ptr;
+}
+
+inline Atomic64 Acquire_Load(volatile const Atomic64* ptr) {
+ Atomic64 value = *ptr;
+ MemoryBarrier();
+ return value;
+}
+
+inline Atomic64 Release_Load(volatile const Atomic64* ptr) {
+ MemoryBarrier();
+ return *ptr;
+}
+
+} // namespace base::subtle
+} // namespace base
+
+#endif // BASE_ATOMICOPS_INTERNALS_GCC_GENERIC_H_