Index: third_party/tcmalloc/chromium/src/base/atomicops_internals_portable.h |
diff --git a/third_party/tcmalloc/chromium/src/base/atomicops_internals_portable.h b/third_party/tcmalloc/chromium/src/base/atomicops_internals_portable.h |
deleted file mode 100644 |
index e853c6155bb69cd66b8a650420c1c203d0ad3c99..0000000000000000000000000000000000000000 |
--- a/third_party/tcmalloc/chromium/src/base/atomicops_internals_portable.h |
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@@ -1,219 +0,0 @@ |
-// Copyright (c) 2014 The Chromium Authors. All rights reserved. |
-// Use of this source code is governed by a BSD-style license that can be |
-// found in the LICENSE file. |
- |
-// This file is an internal atomic implementation, use atomicops.h instead. |
-// |
-// This implementation uses C++11 atomics' member functions. The code base is |
-// currently written assuming atomicity revolves around accesses instead of |
-// C++11's memory locations. The burden is on the programmer to ensure that all |
-// memory locations accessed atomically are never accessed non-atomically (tsan |
-// should help with this). |
-// |
-// TODO(jfb) Modify the atomicops.h API and user code to declare atomic |
-// locations as truly atomic. See the static_assert below. |
-// |
-// Of note in this implementation: |
-// * All NoBarrier variants are implemented as relaxed. |
-// * All Barrier variants are implemented as sequentially-consistent. |
-// * Compare exchange's failure ordering is always the same as the success one |
-// (except for release, which fails as relaxed): using a weaker ordering is |
-// only valid under certain uses of compare exchange. |
-// * Acquire store doesn't exist in the C11 memory model, it is instead |
-// implemented as a relaxed store followed by a sequentially consistent |
-// fence. |
-// * Release load doesn't exist in the C11 memory model, it is instead |
-// implemented as sequentially consistent fence followed by a relaxed load. |
-// * Atomic increment is expected to return the post-incremented value, whereas |
-// C11 fetch add returns the previous value. The implementation therefore |
-// needs to increment twice (which the compiler should be able to detect and |
-// optimize). |
- |
-#ifndef BASE_ATOMICOPS_INTERNALS_PORTABLE_H_ |
-#define BASE_ATOMICOPS_INTERNALS_PORTABLE_H_ |
- |
-#include <stdint.h> |
-#include <atomic> |
- |
-typedef int32_t Atomic32; |
-#define BASE_HAS_ATOMIC64 1 // Use only in tests and base/atomic* |
- |
-#include "build/build_config.h" |
- |
-namespace base { |
-namespace subtle { |
- |
-// This implementation is transitional and maintains the original API for |
-// atomicops.h. This requires casting memory locations to the atomic types, and |
-// assumes that the API and the C++11 implementation are layout-compatible, |
-// which isn't true for all implementations or hardware platforms. The static |
-// assertion should detect this issue, were it to fire then this header |
-// shouldn't be used. |
-// |
-// TODO(jfb) If this header manages to stay committed then the API should be |
-// modified, and all call sites updated. |
-typedef volatile std::atomic<Atomic32>* AtomicLocation32; |
-static_assert(sizeof(*(AtomicLocation32) nullptr) == sizeof(Atomic32), |
- "incompatible 32-bit atomic layout"); |
- |
-inline void MemoryBarrier() { |
-#if defined(__GLIBCXX__) |
- // Work around libstdc++ bug 51038 where atomic_thread_fence was declared but |
- // not defined, leading to the linker complaining about undefined references. |
- __atomic_thread_fence(std::memory_order_seq_cst); |
-#else |
- std::atomic_thread_fence(std::memory_order_seq_cst); |
-#endif |
-} |
- |
-inline Atomic32 NoBarrier_CompareAndSwap(volatile Atomic32* ptr, |
- Atomic32 old_value, |
- Atomic32 new_value) { |
- ((AtomicLocation32)ptr) |
- ->compare_exchange_strong(old_value, new_value, std::memory_order_relaxed, |
- std::memory_order_relaxed); |
- return old_value; |
-} |
- |
-inline Atomic32 NoBarrier_AtomicExchange(volatile Atomic32* ptr, |
- Atomic32 new_value) { |
- return ((AtomicLocation32)ptr) |
- ->exchange(new_value, std::memory_order_relaxed); |
-} |
- |
-inline Atomic32 NoBarrier_AtomicIncrement(volatile Atomic32* ptr, |
- Atomic32 increment) { |
- return increment + ((AtomicLocation32)ptr) |
- ->fetch_add(increment, std::memory_order_relaxed); |
-} |
- |
-inline Atomic32 Barrier_AtomicIncrement(volatile Atomic32* ptr, |
- Atomic32 increment) { |
- return increment + ((AtomicLocation32)ptr)->fetch_add(increment); |
-} |
- |
-inline Atomic32 Acquire_CompareAndSwap(volatile Atomic32* ptr, |
- Atomic32 old_value, |
- Atomic32 new_value) { |
- ((AtomicLocation32)ptr) |
- ->compare_exchange_strong(old_value, new_value, std::memory_order_acquire, |
- std::memory_order_acquire); |
- return old_value; |
-} |
- |
-inline Atomic32 Release_CompareAndSwap(volatile Atomic32* ptr, |
- Atomic32 old_value, |
- Atomic32 new_value) { |
- ((AtomicLocation32)ptr) |
- ->compare_exchange_strong(old_value, new_value, std::memory_order_release, |
- std::memory_order_relaxed); |
- return old_value; |
-} |
- |
-inline void NoBarrier_Store(volatile Atomic32* ptr, Atomic32 value) { |
- ((AtomicLocation32)ptr)->store(value, std::memory_order_relaxed); |
-} |
- |
-inline void Acquire_Store(volatile Atomic32* ptr, Atomic32 value) { |
- ((AtomicLocation32)ptr)->store(value, std::memory_order_relaxed); |
- MemoryBarrier(); |
-} |
- |
-inline void Release_Store(volatile Atomic32* ptr, Atomic32 value) { |
- ((AtomicLocation32)ptr)->store(value, std::memory_order_release); |
-} |
- |
-inline Atomic32 NoBarrier_Load(volatile const Atomic32* ptr) { |
- return ((AtomicLocation32)ptr)->load(std::memory_order_relaxed); |
-} |
- |
-inline Atomic32 Acquire_Load(volatile const Atomic32* ptr) { |
- return ((AtomicLocation32)ptr)->load(std::memory_order_acquire); |
-} |
- |
-inline Atomic32 Release_Load(volatile const Atomic32* ptr) { |
- MemoryBarrier(); |
- return ((AtomicLocation32)ptr)->load(std::memory_order_relaxed); |
-} |
- |
-#if defined(BASE_HAS_ATOMIC64) |
-typedef int64_t Atomic64; |
- |
-typedef volatile std::atomic<Atomic64>* AtomicLocation64; |
-static_assert(sizeof(*(AtomicLocation64) nullptr) == sizeof(Atomic64), |
- "incompatible 64-bit atomic layout"); |
- |
-inline Atomic64 NoBarrier_CompareAndSwap(volatile Atomic64* ptr, |
- Atomic64 old_value, |
- Atomic64 new_value) { |
- ((AtomicLocation64)ptr) |
- ->compare_exchange_strong(old_value, new_value, std::memory_order_relaxed, |
- std::memory_order_relaxed); |
- return old_value; |
-} |
- |
-inline Atomic64 NoBarrier_AtomicExchange(volatile Atomic64* ptr, |
- Atomic64 new_value) { |
- return ((AtomicLocation64)ptr) |
- ->exchange(new_value, std::memory_order_relaxed); |
-} |
- |
-inline Atomic64 NoBarrier_AtomicIncrement(volatile Atomic64* ptr, |
- Atomic64 increment) { |
- return increment + ((AtomicLocation64)ptr) |
- ->fetch_add(increment, std::memory_order_relaxed); |
-} |
- |
-inline Atomic64 Barrier_AtomicIncrement(volatile Atomic64* ptr, |
- Atomic64 increment) { |
- return increment + ((AtomicLocation64)ptr)->fetch_add(increment); |
-} |
- |
-inline Atomic64 Acquire_CompareAndSwap(volatile Atomic64* ptr, |
- Atomic64 old_value, |
- Atomic64 new_value) { |
- ((AtomicLocation64)ptr) |
- ->compare_exchange_strong(old_value, new_value, std::memory_order_acquire, |
- std::memory_order_acquire); |
- return old_value; |
-} |
- |
-inline Atomic64 Release_CompareAndSwap(volatile Atomic64* ptr, |
- Atomic64 old_value, |
- Atomic64 new_value) { |
- ((AtomicLocation64)ptr) |
- ->compare_exchange_strong(old_value, new_value, std::memory_order_release, |
- std::memory_order_relaxed); |
- return old_value; |
-} |
- |
-inline void NoBarrier_Store(volatile Atomic64* ptr, Atomic64 value) { |
- ((AtomicLocation64)ptr)->store(value, std::memory_order_relaxed); |
-} |
- |
-inline void Acquire_Store(volatile Atomic64* ptr, Atomic64 value) { |
- ((AtomicLocation64)ptr)->store(value, std::memory_order_relaxed); |
- MemoryBarrier(); |
-} |
- |
-inline void Release_Store(volatile Atomic64* ptr, Atomic64 value) { |
- ((AtomicLocation64)ptr)->store(value, std::memory_order_release); |
-} |
- |
-inline Atomic64 NoBarrier_Load(volatile const Atomic64* ptr) { |
- return ((AtomicLocation64)ptr)->load(std::memory_order_relaxed); |
-} |
- |
-inline Atomic64 Acquire_Load(volatile const Atomic64* ptr) { |
- return ((AtomicLocation64)ptr)->load(std::memory_order_acquire); |
-} |
- |
-inline Atomic64 Release_Load(volatile const Atomic64* ptr) { |
- MemoryBarrier(); |
- return ((AtomicLocation64)ptr)->load(std::memory_order_relaxed); |
-} |
-#endif // defined(BASE_HAS_ATOMIC64) |
-} // namespace subtle |
-} // namespace base |
- |
-#endif // BASE_ATOMICOPS_INTERNALS_PORTABLE_H_ |