Index: third_party/tcmalloc/chromium/src/base/atomicops-internals-arm-gcc.h |
=================================================================== |
--- third_party/tcmalloc/chromium/src/base/atomicops-internals-arm-gcc.h (revision 0) |
+++ third_party/tcmalloc/chromium/src/base/atomicops-internals-arm-gcc.h (revision 0) |
@@ -0,0 +1,234 @@ |
+/* Copyright (c) 2010, 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. |
+ * |
+ * --- |
+ * Author: Lei Zhang, Sasha Levitskiy |
+ */ |
+ |
+// This file is an internal atomic implementation, use base/atomicops.h instead. |
+// |
+// LinuxKernelCmpxchg and Barrier_AtomicIncrement are from Google Gears. |
+ |
+#ifndef BASE_ATOMICOPS_INTERNALS_ARM_GCC_H_ |
+#define BASE_ATOMICOPS_INTERNALS_ARM_GCC_H_ |
+ |
+#include <stdio.h> |
+#include "base/basictypes.h" // For COMPILE_ASSERT |
+ |
+typedef int32_t Atomic32; |
+ |
+namespace base { |
+namespace subtle { |
+ |
+typedef int64_t Atomic64; |
+ |
+// 0xffff0fc0 is the hard coded address of a function provided by |
+// the kernel which implements an atomic compare-exchange. On older |
+// ARM architecture revisions (pre-v6) this may be implemented using |
+// a syscall. This address is stable, and in active use (hard coded) |
+// by at least glibc-2.7 and the Android C library. |
+// pLinuxKernelCmpxchg has both acquire and release barrier sematincs. |
+typedef Atomic32 (*LinuxKernelCmpxchgFunc)(Atomic32 old_value, |
+ Atomic32 new_value, |
+ volatile Atomic32* ptr); |
+LinuxKernelCmpxchgFunc pLinuxKernelCmpxchg __attribute__((weak)) = |
+ (LinuxKernelCmpxchgFunc) 0xffff0fc0; |
+ |
+typedef void (*LinuxKernelMemoryBarrierFunc)(void); |
+LinuxKernelMemoryBarrierFunc pLinuxKernelMemoryBarrier __attribute__((weak)) = |
+ (LinuxKernelMemoryBarrierFunc) 0xffff0fa0; |
+ |
+ |
+inline Atomic32 NoBarrier_CompareAndSwap(volatile Atomic32* ptr, |
+ Atomic32 old_value, |
+ Atomic32 new_value) { |
+ Atomic32 prev_value = *ptr; |
+ do { |
+ if (!pLinuxKernelCmpxchg(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 (pLinuxKernelCmpxchg(old_value, new_value, |
+ const_cast<Atomic32*>(ptr))); |
+ return old_value; |
+} |
+ |
+inline Atomic32 Barrier_AtomicIncrement(volatile Atomic32* ptr, |
+ Atomic32 increment) { |
+ for (;;) { |
+ // Atomic exchange the old value with an incremented one. |
+ Atomic32 old_value = *ptr; |
+ Atomic32 new_value = old_value + increment; |
+ if (pLinuxKernelCmpxchg(old_value, new_value, |
+ const_cast<Atomic32*>(ptr)) == 0) { |
+ // The exchange took place as expected. |
+ return new_value; |
+ } |
+ // Otherwise, *ptr changed mid-loop and we need to retry. |
+ } |
+} |
+ |
+inline Atomic32 NoBarrier_AtomicIncrement(volatile Atomic32* ptr, |
+ Atomic32 increment) { |
+ return Barrier_AtomicIncrement(ptr, increment); |
+} |
+ |
+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() { |
+ pLinuxKernelMemoryBarrier(); |
+} |
+ |
+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 are not implemented yet. |
+ |
+inline void NotImplementedFatalError(const char *function_name) { |
+ fprintf(stderr, "64-bit %s() not implemented on this platform\n", |
+ function_name); |
+ abort(); |
+} |
+ |
+inline Atomic64 NoBarrier_CompareAndSwap(volatile Atomic64* ptr, |
+ Atomic64 old_value, |
+ Atomic64 new_value) { |
+ NotImplementedFatalError("NoBarrier_CompareAndSwap"); |
+ return 0; |
+} |
+ |
+inline Atomic64 NoBarrier_AtomicExchange(volatile Atomic64* ptr, |
+ Atomic64 new_value) { |
+ NotImplementedFatalError("NoBarrier_AtomicExchange"); |
+ return 0; |
+} |
+ |
+inline Atomic64 NoBarrier_AtomicIncrement(volatile Atomic64* ptr, |
+ Atomic64 increment) { |
+ NotImplementedFatalError("NoBarrier_AtomicIncrement"); |
+ return 0; |
+} |
+ |
+inline Atomic64 Barrier_AtomicIncrement(volatile Atomic64* ptr, |
+ Atomic64 increment) { |
+ NotImplementedFatalError("Barrier_AtomicIncrement"); |
+ return 0; |
+} |
+ |
+inline void NoBarrier_Store(volatile Atomic64* ptr, Atomic64 value) { |
+ NotImplementedFatalError("NoBarrier_Store"); |
+} |
+ |
+inline void Acquire_Store(volatile Atomic64* ptr, Atomic64 value) { |
+ NoBarrier_AtomicExchange(ptr, value); |
+ // acts as a barrier in this implementation |
+} |
+ |
+inline void Release_Store(volatile Atomic64* ptr, Atomic64 value) { |
+ NotImplementedFatalError("Release_Store"); |
+} |
+ |
+inline Atomic64 NoBarrier_Load(volatile const Atomic64* ptr) { |
+ NotImplementedFatalError("NoBarrier_Load"); |
+ return 0; |
+} |
+ |
+inline Atomic64 Acquire_Load(volatile const Atomic64* ptr) { |
+ Atomic64 value = NoBarrier_Load(ptr); |
+ return value; |
+} |
+ |
+inline Atomic64 Release_Load(volatile const Atomic64* ptr) { |
+ MemoryBarrier(); |
+ return NoBarrier_Load(ptr); |
+} |
+ |
+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); |
+} |
+ |
+} // namespace base::subtle |
+} // namespace base |
+ |
+#endif // BASE_ATOMICOPS_INTERNALS_ARM_GCC_H_ |
Property changes on: third_party/tcmalloc/chromium/src/base/atomicops-internals-arm-gcc.h |
___________________________________________________________________ |
Added: svn:eol-style |
+ LF |