Merge pull request #804 from bsilver8192/master
Add atomics support for 32-bit PPC.
diff --git a/src/google/protobuf/stubs/atomicops.h b/src/google/protobuf/stubs/atomicops.h
index cb93227..9b3d1e6 100644
--- a/src/google/protobuf/stubs/atomicops.h
+++ b/src/google/protobuf/stubs/atomicops.h
@@ -214,6 +214,8 @@
#include <google/protobuf/stubs/atomicops_internals_power.h>
#elif defined(__native_client__)
#include <google/protobuf/stubs/atomicops_internals_pnacl.h>
+#elif defined(GOOGLE_PROTOBUF_ARCH_PPC)
+#include <google/protobuf/stubs/atomicops_internals_ppc_gcc.h>
#elif (((__GNUC__ == 4) && (__GNUC_MINOR__ >= 7)) || (__GNUC__ > 4))
#include <google/protobuf/stubs/atomicops_internals_generic_gcc.h>
#elif defined(__clang__)
diff --git a/src/google/protobuf/stubs/atomicops_internals_ppc_gcc.h b/src/google/protobuf/stubs/atomicops_internals_ppc_gcc.h
new file mode 100644
index 0000000..8231a57
--- /dev/null
+++ b/src/google/protobuf/stubs/atomicops_internals_ppc_gcc.h
@@ -0,0 +1,155 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2015 Google Inc. All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// 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: ogabbay@advaoptical.com (Oded Gabbay)
+// Cleaned up by: bsilver16384@gmail.com (Brian Silverman)
+//
+// This file is an internal atomic implementation, use atomicops.h instead.
+
+#ifndef GOOGLE_PROTOBUF_ATOMICOPS_INTERNALS_PPC_GCC_H_
+#define GOOGLE_PROTOBUF_ATOMICOPS_INTERNALS_PPC_GCC_H_
+
+#define ATOMICOPS_COMPILER_BARRIER() __asm__ __volatile__("" : : : "memory")
+
+namespace google {
+namespace protobuf {
+namespace internal {
+
+inline Atomic32 NoBarrier_CompareAndSwap(volatile Atomic32 *ptr,
+ Atomic32 old_value,
+ Atomic32 new_value) {
+ Atomic32 prev;
+
+ __asm__ __volatile__(
+ "0: \n\t"
+ "lwarx %[prev],0,%[ptr] \n\t"
+ "cmpw 0,%[prev],%[old_value] \n\t"
+ "bne- 1f \n\t"
+ "stwcx. %[new_value],0,%[ptr] \n\t"
+ "bne- 0b \n\t"
+ "1: \n\t"
+ : [prev] "=&r"(prev), "+m"(*ptr)
+ : [ptr] "r"(ptr), [old_value] "r"(old_value), [new_value] "r"(new_value)
+ : "cc", "memory");
+
+ return prev;
+}
+
+inline Atomic32 NoBarrier_AtomicExchange(volatile Atomic32 *ptr,
+ Atomic32 new_value) {
+ Atomic32 old;
+
+ __asm__ __volatile__(
+ "0: \n\t"
+ "lwarx %[old],0,%[ptr] \n\t"
+ "stwcx. %[new_value],0,%[ptr] \n\t"
+ "bne- 0b \n\t"
+ : [old] "=&r"(old), "+m"(*ptr)
+ : [ptr] "r"(ptr), [new_value] "r"(new_value)
+ : "cc", "memory");
+
+ return old;
+}
+
+inline Atomic32 NoBarrier_AtomicIncrement(volatile Atomic32 *ptr,
+ Atomic32 increment) {
+ Atomic32 temp;
+
+ __asm__ __volatile__(
+ "0: \n\t"
+ "lwarx %[temp],0,%[ptr] \n\t"
+ "add %[temp],%[increment],%[temp] \n\t"
+ "stwcx. %[temp],0,%[ptr] \n\t"
+ "bne- 0b \n\t"
+ : [temp] "=&r"(temp)
+ : [increment] "r"(increment), [ptr] "r"(ptr)
+ : "cc", "memory");
+
+ return temp;
+}
+
+inline Atomic32 Barrier_AtomicIncrement(volatile Atomic32 *ptr,
+ Atomic32 increment) {
+ MemoryBarrier();
+ Atomic32 res = NoBarrier_AtomicIncrement(ptr, increment);
+ MemoryBarrier();
+ return res;
+}
+
+inline Atomic32 Acquire_CompareAndSwap(volatile Atomic32 *ptr,
+ Atomic32 old_value, Atomic32 new_value) {
+ Atomic32 res = NoBarrier_CompareAndSwap(ptr, old_value, new_value);
+ MemoryBarrier();
+ return res;
+}
+
+inline Atomic32 Release_CompareAndSwap(volatile Atomic32 *ptr,
+ Atomic32 old_value, Atomic32 new_value) {
+ MemoryBarrier();
+ Atomic32 res = NoBarrier_CompareAndSwap(ptr, old_value, new_value);
+ return res;
+}
+
+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;
+}
+
+} // namespace internal
+} // namespace protobuf
+} // namespace google
+
+#undef ATOMICOPS_COMPILER_BARRIER
+
+#endif // GOOGLE_PROTOBUF_ATOMICOPS_INTERNALS_PPC_GCC_H_
diff --git a/src/google/protobuf/stubs/platform_macros.h b/src/google/protobuf/stubs/platform_macros.h
index 22b3572..4ba4b34 100644
--- a/src/google/protobuf/stubs/platform_macros.h
+++ b/src/google/protobuf/stubs/platform_macros.h
@@ -73,6 +73,9 @@
#elif defined(_POWER) || defined(__powerpc64__) || defined(__PPC64__)
#define GOOGLE_PROTOBUF_ARCH_POWER 1
#define GOOGLE_PROTOBUF_ARCH_64_BIT 1
+#elif defined(__PPC__)
+#define GOOGLE_PROTOBUF_ARCH_PPC 1
+#define GOOGLE_PROTOBUF_ARCH_32_BIT 1
#elif defined(__GNUC__)
# if (((__GNUC__ == 4) && (__GNUC_MINOR__ >= 7)) || (__GNUC__ > 4))
// We fallback to the generic Clang/GCC >= 4.7 implementation in atomicops.h