tcmalloc: Use C++11 atomics where appropriate.

third_party/tcmalloc/chromium/src/base/atomicops-internals-linuxppc.h

Index: third_party/tcmalloc/chromium/src/base/atomicops-internals-linuxppc.h
diff --git a/third_party/tcmalloc/chromium/src/base/atomicops-internals-linuxppc.h b/third_party/tcmalloc/chromium/src/base/atomicops-internals-linuxppc.h
deleted file mode 100644
index 7e49560dca14b6d4d1f1b157f70b14ed90fa666c..0000000000000000000000000000000000000000
--- a/third_party/tcmalloc/chromium/src/base/atomicops-internals-linuxppc.h
+++ /dev/null
@@ -1,416 +0,0 @@
-/* Copyright (c) 2008, Google Inc.
- * 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.
- *
- * ---
- */
-
-// Implementation of atomic operations for ppc-linux.  This file should not
-// be included directly.  Clients should instead include
-// "base/atomicops.h".
-
-#ifndef BASE_ATOMICOPS_INTERNALS_LINUXPPC_H_
-#define BASE_ATOMICOPS_INTERNALS_LINUXPPC_H_
-
-typedef int32_t Atomic32;
-
-#ifdef __PPC64__
-#define BASE_HAS_ATOMIC64 1
-#endif
-
-namespace base {
-namespace subtle {
-
-static inline void _sync(void) {
-  __asm__ __volatile__("sync": : : "memory");
-}
-
-static inline void _lwsync(void) {
-  // gcc defines __NO_LWSYNC__ when appropriate; see
-  //    http://gcc.gnu.org/ml/gcc-patches/2006-11/msg01238.html
-#ifdef __NO_LWSYNC__
-  __asm__ __volatile__("msync": : : "memory");
-#else
-  __asm__ __volatile__("lwsync": : : "memory");
-#endif
-}
-
-static inline void _isync(void) {
-  __asm__ __volatile__("isync": : : "memory");
-}
-
-static inline Atomic32 OSAtomicAdd32(Atomic32 amount, Atomic32 *value) {
-  Atomic32 t;
-  __asm__ __volatile__(
-"1:		lwarx   %0,0,%3\n\
-		add     %0,%2,%0\n\
-		stwcx.  %0,0,%3 \n\
-		bne-    1b"
-		: "=&r" (t), "+m" (*value)
-		: "r" (amount), "r" (value)
-                : "cc");
-  return t;
-}
-
-static inline Atomic32 OSAtomicAdd32Barrier(Atomic32 amount, Atomic32 *value) {
-  Atomic32 t;
-  _lwsync();
-  t = OSAtomicAdd32(amount, value);
-  // This is based on the code snippet in the architecture manual (Vol
-  // 2, Appendix B).  It's a little tricky: correctness depends on the
-  // fact that the code right before this (in OSAtomicAdd32) has a
-  // conditional branch with a data dependency on the update.
-  // Otherwise, we'd have to use sync.
-  _isync();
-  return t;
-}
-
-static inline bool OSAtomicCompareAndSwap32(Atomic32 old_value,
-                                            Atomic32 new_value,
-                                            Atomic32 *value) {
-  Atomic32 prev;
-  __asm__ __volatile__(
-"1:		lwarx   %0,0,%2\n\
-		cmpw    0,%0,%3\n\
-		bne-    2f\n\
-		stwcx.  %4,0,%2\n\
-		bne-    1b\n\
-2:"
-                : "=&r" (prev), "+m" (*value)
-                : "r" (value), "r" (old_value), "r" (new_value)
-                : "cc");
-  return prev == old_value;
-}
-
-static inline Atomic32 OSAtomicCompareAndSwap32Acquire(Atomic32 old_value,
-                                                       Atomic32 new_value,
-                                                       Atomic32 *value) {
-  Atomic32 t;
-  t = OSAtomicCompareAndSwap32(old_value, new_value, value);
-  // This is based on the code snippet in the architecture manual (Vol
-  // 2, Appendix B).  It's a little tricky: correctness depends on the
-  // fact that the code right before this (in
-  // OSAtomicCompareAndSwap32) has a conditional branch with a data
-  // dependency on the update.  Otherwise, we'd have to use sync.
-  _isync();
-  return t;
-}
-
-static inline Atomic32 OSAtomicCompareAndSwap32Release(Atomic32 old_value,
-                                                       Atomic32 new_value,
-                                                       Atomic32 *value) {
-  _lwsync();
-  return OSAtomicCompareAndSwap32(old_value, new_value, value);
-}
-
-typedef int64_t Atomic64;
-
-inline void MemoryBarrier() {
-  // This can't be _lwsync(); we need to order the immediately
-  // preceding stores against any load that may follow, but lwsync
-  // doesn't guarantee that.
-  _sync();
-}
-
-// 32-bit Versions.
-
-inline Atomic32 NoBarrier_CompareAndSwap(volatile Atomic32 *ptr,
-                                         Atomic32 old_value,
-                                         Atomic32 new_value) {
-  Atomic32 prev_value;
-  do {
-    if (OSAtomicCompareAndSwap32(old_value, new_value,
-                                 const_cast<Atomic32*>(ptr))) {
-      return old_value;
-    }
-    prev_value = *ptr;
-  } while (prev_value == old_value);
-  return prev_value;
-}
-
-inline Atomic32 NoBarrier_AtomicExchange(volatile Atomic32 *ptr,
-                                         Atomic32 new_value) {
-  Atomic32 old_value;
-  do {
-    old_value = *ptr;
-  } while (!OSAtomicCompareAndSwap32(old_value, new_value,
-                                     const_cast<Atomic32*>(ptr)));
-  return old_value;
-}
-
-inline Atomic32 NoBarrier_AtomicIncrement(volatile Atomic32 *ptr,
-                                          Atomic32 increment) {
-  return OSAtomicAdd32(increment, const_cast<Atomic32*>(ptr));
-}
-
-inline Atomic32 Barrier_AtomicIncrement(volatile Atomic32 *ptr,
-                                        Atomic32 increment) {
-  return OSAtomicAdd32Barrier(increment, const_cast<Atomic32*>(ptr));
-}
-
-inline Atomic32 Acquire_CompareAndSwap(volatile Atomic32 *ptr,
-                                       Atomic32 old_value,
-                                       Atomic32 new_value) {
-  Atomic32 prev_value;
-  do {
-    if (OSAtomicCompareAndSwap32Acquire(old_value, new_value,
-                                        const_cast<Atomic32*>(ptr))) {
-      return old_value;
-    }
-    prev_value = *ptr;
-  } while (prev_value == old_value);
-  return prev_value;
-}
-
-inline Atomic32 Release_CompareAndSwap(volatile Atomic32 *ptr,
-                                       Atomic32 old_value,
-                                       Atomic32 new_value) {
-  Atomic32 prev_value;
-  do {
-    if (OSAtomicCompareAndSwap32Release(old_value, new_value,
-                                        const_cast<Atomic32*>(ptr))) {
-      return old_value;
-    }
-    prev_value = *ptr;
-  } while (prev_value == old_value);
-  return prev_value;
-}
-
-#ifdef __PPC64__
-
-// 64-bit Versions.
-
-static inline Atomic64 OSAtomicAdd64(Atomic64 amount, Atomic64 *value) {
-  Atomic64 t;
-  __asm__ __volatile__(
-"1:		ldarx   %0,0,%3\n\
-		add     %0,%2,%0\n\
-		stdcx.  %0,0,%3 \n\
-		bne-    1b"
-		: "=&r" (t), "+m" (*value)
-		: "r" (amount), "r" (value)
-                : "cc");
-  return t;
-}
-
-static inline Atomic64 OSAtomicAdd64Barrier(Atomic64 amount, Atomic64 *value) {
-  Atomic64 t;
-  _lwsync();
-  t = OSAtomicAdd64(amount, value);
-  // This is based on the code snippet in the architecture manual (Vol
-  // 2, Appendix B).  It's a little tricky: correctness depends on the
-  // fact that the code right before this (in OSAtomicAdd64) has a
-  // conditional branch with a data dependency on the update.
-  // Otherwise, we'd have to use sync.
-  _isync();
-  return t;
-}
-
-static inline bool OSAtomicCompareAndSwap64(Atomic64 old_value,
-                                            Atomic64 new_value,
-                                            Atomic64 *value) {
-  Atomic64 prev;
-  __asm__ __volatile__(
-"1:		ldarx   %0,0,%2\n\
-		cmpw    0,%0,%3\n\
-		bne-    2f\n\
-		stdcx.  %4,0,%2\n\
-		bne-    1b\n\
-2:"
-                : "=&r" (prev), "+m" (*value)
-                : "r" (value), "r" (old_value), "r" (new_value)
-                : "cc");
-  return prev == old_value;
-}
-
-static inline Atomic64 OSAtomicCompareAndSwap64Acquire(Atomic64 old_value,
-                                                       Atomic64 new_value,
-                                                       Atomic64 *value) {
-  Atomic64 t;
-  t = OSAtomicCompareAndSwap64(old_value, new_value, value);
-  // This is based on the code snippet in the architecture manual (Vol
-  // 2, Appendix B).  It's a little tricky: correctness depends on the
-  // fact that the code right before this (in
-  // OSAtomicCompareAndSwap64) has a conditional branch with a data
-  // dependency on the update.  Otherwise, we'd have to use sync.
-  _isync();
-  return t;
-}
-
-static inline Atomic64 OSAtomicCompareAndSwap64Release(Atomic64 old_value,
-                                                       Atomic64 new_value,
-                                                       Atomic64 *value) {
-  _lwsync();
-  return OSAtomicCompareAndSwap64(old_value, new_value, value);
-}
-
-
-inline Atomic64 NoBarrier_CompareAndSwap(volatile Atomic64 *ptr,
-                                         Atomic64 old_value,
-                                         Atomic64 new_value) {
-  Atomic64 prev_value;
-  do {
-    if (OSAtomicCompareAndSwap64(old_value, new_value,
-                                 const_cast<Atomic64*>(ptr))) {
-      return old_value;
-    }
-    prev_value = *ptr;
-  } while (prev_value == old_value);
-  return prev_value;
-}
-
-inline Atomic64 NoBarrier_AtomicExchange(volatile Atomic64 *ptr,
-                                         Atomic64 new_value) {
-  Atomic64 old_value;
-  do {
-    old_value = *ptr;
-  } while (!OSAtomicCompareAndSwap64(old_value, new_value,
-                                     const_cast<Atomic64*>(ptr)));
-  return old_value;
-}
-
-inline Atomic64 NoBarrier_AtomicIncrement(volatile Atomic64 *ptr,
-                                          Atomic64 increment) {
-  return OSAtomicAdd64(increment, const_cast<Atomic64*>(ptr));
-}
-
-inline Atomic64 Barrier_AtomicIncrement(volatile Atomic64 *ptr,
-                                        Atomic64 increment) {
-  return OSAtomicAdd64Barrier(increment, const_cast<Atomic64*>(ptr));
-}
-
-inline Atomic64 Acquire_CompareAndSwap(volatile Atomic64 *ptr,
-                                       Atomic64 old_value,
-                                       Atomic64 new_value) {
-  Atomic64 prev_value;
-  do {
-    if (OSAtomicCompareAndSwap64Acquire(old_value, new_value,
-                                        const_cast<Atomic64*>(ptr))) {
-      return old_value;
-    }
-    prev_value = *ptr;
-  } while (prev_value == old_value);
-  return prev_value;
-}
-
-inline Atomic64 Release_CompareAndSwap(volatile Atomic64 *ptr,
-                                       Atomic64 old_value,
-                                       Atomic64 new_value) {
-  Atomic64 prev_value;
-  do {
-    if (OSAtomicCompareAndSwap64Release(old_value, new_value,
-                                        const_cast<Atomic64*>(ptr))) {
-      return old_value;
-    }
-    prev_value = *ptr;
-  } while (prev_value == old_value);
-  return prev_value;
-}
-
-#endif
-
-inline void NoBarrier_Store(volatile Atomic32 *ptr, Atomic32 value) {
-  *ptr = value;
-}
-
-inline void Acquire_Store(volatile Atomic32 *ptr, Atomic32 value) {
-  *ptr = value;
-  // This can't be _lwsync(); we need to order the immediately
-  // preceding stores against any load that may follow, but lwsync
-  // doesn't guarantee that.
-  _sync();
-}
-
-inline void Release_Store(volatile Atomic32 *ptr, Atomic32 value) {
-  _lwsync();
-  *ptr = value;
-}
-
-inline Atomic32 NoBarrier_Load(volatile const Atomic32 *ptr) {
-  return *ptr;
-}
-
-inline Atomic32 Acquire_Load(volatile const Atomic32 *ptr) {
-  Atomic32 value = *ptr;
-  _lwsync();
-  return value;
-}
-
-inline Atomic32 Release_Load(volatile const Atomic32 *ptr) {
-  // This can't be _lwsync(); we need to order the immediately
-  // preceding stores against any load that may follow, but lwsync
-  // doesn't guarantee that.
-  _sync();
-  return *ptr;
-}
-
-#ifdef __PPC64__
-
-// 64-bit Versions.
-
-inline void NoBarrier_Store(volatile Atomic64 *ptr, Atomic64 value) {
-  *ptr = value;
-}
-
-inline void Acquire_Store(volatile Atomic64 *ptr, Atomic64 value) {
-  *ptr = value;
-  // This can't be _lwsync(); we need to order the immediately
-  // preceding stores against any load that may follow, but lwsync
-  // doesn't guarantee that.
-  _sync();
-}
-
-inline void Release_Store(volatile Atomic64 *ptr, Atomic64 value) {
-  _lwsync();
-  *ptr = value;
-}
-
-inline Atomic64 NoBarrier_Load(volatile const Atomic64 *ptr) {
-  return *ptr;
-}
-
-inline Atomic64 Acquire_Load(volatile const Atomic64 *ptr) {
-  Atomic64 value = *ptr;
-  _lwsync();
-  return value;
-}
-
-inline Atomic64 Release_Load(volatile const Atomic64 *ptr) {
-  // This can't be _lwsync(); we need to order the immediately
-  // preceding stores against any load that may follow, but lwsync
-  // doesn't guarantee that.
-  _sync();
-  return *ptr;
-}
-
-#endif
-
-}   // namespace base::subtle
-}   // namespace base
-
-#endif  // BASE_ATOMICOPS_INTERNALS_LINUXPPC_H_