Bug 1246501 - Add ppc specific atomic operations to ipc/chromium. r=Waldo

ipc/chromium/src/base/atomicops.h

@@ -144,6 +144,8 @@ Atomic64 Release_Load(volatile const Atomic64* ptr);
 #include "base/atomicops_internals_arm64_gcc.h"
 #elif defined(COMPILER_GCC) && defined(ARCH_CPU_MIPS)
 #include "base/atomicops_internals_mips_gcc.h"
+#elif defined(COMPILER_GCC) && defined(ARCH_CPU_PPC_FAMILY)
+#include "base/atomicops_internals_ppc_gcc.h"
 #else
 #include "base/atomicops_internals_mutex.h"
 #endif

ipc/chromium/src/base/atomicops_internals_ppc_gcc.h

@@ -0,0 +1,132 @@
+// Copyright 2012 the V8 project 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.
+//
+#ifndef BASE_ATOMICOPS_INTERNALS_PPC_H_
+#define BASE_ATOMICOPS_INTERNALS_PPC_H_
+namespace base {
+namespace subtle {
+inline Atomic32 NoBarrier_CompareAndSwap(volatile Atomic32* ptr,
+                                         Atomic32 old_value,
+                                         Atomic32 new_value) {
+  return (__sync_val_compare_and_swap(ptr, old_value, new_value));
+}
+inline Atomic32 NoBarrier_AtomicExchange(volatile Atomic32* ptr,
+                                         Atomic32 new_value) {
+  Atomic32 old_value;
+  do {
+    old_value = *ptr;
+  } while (__sync_bool_compare_and_swap(ptr, old_value, new_value) == false);
+  return old_value;
+}
+inline Atomic32 NoBarrier_AtomicIncrement(volatile Atomic32* ptr,
+                                          Atomic32 increment) {
+  return Barrier_AtomicIncrement(ptr, increment);
+}
+inline Atomic32 Barrier_AtomicIncrement(volatile Atomic32* ptr,
+                                        Atomic32 increment) {
+  for (;;) {
+    Atomic32 old_value = *ptr;
+    Atomic32 new_value = old_value + increment;
+    if (__sync_bool_compare_and_swap(ptr, old_value, new_value)) {
+      return new_value;
+      // The exchange took place as expected.
+    }
+    // Otherwise, *ptr changed mid-loop and we need to retry.
+  }
+}
+inline Atomic32 Acquire_CompareAndSwap(volatile Atomic32* ptr,
+                                       Atomic32 old_value, Atomic32 new_value) {
+  return NoBarrier_CompareAndSwap(ptr, old_value, new_value);
+}
+inline Atomic32 Release_CompareAndSwap(volatile Atomic32* ptr,
+                                       Atomic32 old_value, Atomic32 new_value) {
+  return NoBarrier_CompareAndSwap(ptr, old_value, new_value);
+}
+inline void NoBarrier_Store(volatile Atomic32* ptr, Atomic32 value) {
+  *ptr = value;
+}
+inline void MemoryBarrier() {
+  __asm__ __volatile__("sync" : : : "memory"); }
+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;
+}
+#ifdef ARCH_CPU_PPC64
+inline Atomic64 NoBarrier_CompareAndSwap(volatile Atomic64* ptr,
+                                         Atomic64 old_value,
+                                         Atomic64 new_value) {
+  return (__sync_val_compare_and_swap(ptr, old_value, new_value));
+}
+inline Atomic64 NoBarrier_AtomicExchange(volatile Atomic64* ptr,
+                                         Atomic64 new_value) {
+  Atomic64 old_value;
+  do {
+    old_value = *ptr;
+  } while (__sync_bool_compare_and_swap(ptr, old_value, new_value) == false);
+  return old_value;
+}
+inline Atomic64 NoBarrier_AtomicIncrement(volatile Atomic64* ptr,
+                                          Atomic64 increment) {
+  return Barrier_AtomicIncrement(ptr, increment);
+}
+inline Atomic64 Barrier_AtomicIncrement(volatile Atomic64* ptr,
+                                        Atomic64 increment) {
+  for (;;) {
+    Atomic64 old_value = *ptr;
+    Atomic64 new_value = old_value + increment;
+    if (__sync_bool_compare_and_swap(ptr, old_value, new_value)) {
+      return new_value;
+      // The exchange took place as expected.
+    }
+    // Otherwise, *ptr changed mid-loop and we need to retry.
+  }
+}
+inline Atomic64 Acquire_CompareAndSwap(volatile Atomic64* ptr,
+                                       Atomic64 old_value, Atomic64 new_value) {
+  return NoBarrier_CompareAndSwap(ptr, old_value, new_value);
+}
+inline Atomic64 Release_CompareAndSwap(volatile Atomic64* ptr,
+                                       Atomic64 old_value, Atomic64 new_value) {
+  return NoBarrier_CompareAndSwap(ptr, old_value, new_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;
+}
+#endif
+}  // namespace base::subtle
+}  // namespace base
+#endif  // BASE_ATOMICOPS_INTERNALS_PPC_GCC_H_