Add atomicops from V8.

1 files changed, 122 insertions, 0 deletions

diff --git a/src/google/protobuf/stubs/platform_macros.h b/src/google/protobuf/stubs/platform_macros.h
new file mode 100644
index 00000000..d22ef61b
--- /dev/null
+++ b/src/google/protobuf/stubs/platform_macros.h
@@ -0,0 +1,122 @@
+// Copyright 2011 the V8 authors. 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.
+
+#ifndef GOOGLE_PROTOBUF_PLATFORM_MACROS_H_
+#define GOOGLE_PROTOBUF_PLATFORM_MACROS_H_
+
+#include <google/protobuf/stubs/common.h>
+
+// Processor architecture detection.  For more info on what's defined, see:
+//   http://msdn.microsoft.com/en-us/library/b0084kay.aspx
+//   http://www.agner.org/optimize/calling_conventions.pdf
+//   or with gcc, run: "echo | gcc -E -dM -"
+#if defined(_M_X64) || defined(__x86_64__)
+#define GOOGLE_PROTOBUF_HOST_ARCH_X64 1
+#define GOOGLE_PROTOBUF_HOST_ARCH_64_BIT 1
+#define GOOGLE_PROTOBUF_HOST_CAN_READ_UNALIGNED 1
+#elif defined(_M_IX86) || defined(__i386__)
+#define GOOGLE_PROTOBUF_HOST_ARCH_IA32 1
+#define GOOGLE_PROTOBUF_HOST_ARCH_32_BIT 1
+#define GOOGLE_PROTOBUF_HOST_CAN_READ_UNALIGNED 1
+#elif defined(__ARMEL__)
+#define GOOGLE_PROTOBUF_HOST_ARCH_ARM 1
+#define GOOGLE_PROTOBUF_HOST_ARCH_32_BIT 1
+// Some CPU-OS combinations allow unaligned access on ARM. We assume
+// that unaligned accesses are not allowed unless the build system
+// defines the CAN_USE_UNALIGNED_ACCESSES macro to be non-zero.
+#if CAN_USE_UNALIGNED_ACCESSES
+#define GOOGLE_PROTOBUF_HOST_CAN_READ_UNALIGNED 1
+#endif
+#elif defined(__MIPSEL__)
+#define GOOGLE_PROTOBUF_HOST_ARCH_MIPS 1
+#define GOOGLE_PROTOBUF_HOST_ARCH_32_BIT 1
+#else
+#error Host architecture was not detected as supported by v8
+#endif
+
+// Target architecture detection. This may be set externally. If not, detect
+// in the same way as the host architecture, that is, target the native
+// environment as presented by the compiler.
+#if !defined(GOOGLE_PROTOBUF_TARGET_ARCH_X64) && \
+    !defined(GOOGLE_PROTOBUF_TARGET_ARCH_IA32) && \
+    !defined(GOOGLE_PROTOBUF_TARGET_ARCH_ARM) && \
+    !defined(GOOGLE_PROTOBUF_TARGET_ARCH_MIPS)
+#if defined(_M_X64) || defined(__x86_64__)
+#define GOOGLE_PROTOBUF_TARGET_ARCH_X64 1
+#elif defined(_M_IX86) || defined(__i386__)
+#define GOOGLE_PROTOBUF_TARGET_ARCH_IA32 1
+#elif defined(__ARMEL__)
+#define GOOGLE_PROTOBUF_TARGET_ARCH_ARM 1
+#elif defined(__MIPSEL__)
+#define GOOGLE_PROTOBUF_TARGET_ARCH_MIPS 1
+#else
+#error Target architecture was not detected as supported by v8
+#endif
+#endif
+
+// Check for supported combinations of host and target architectures.
+#if defined(GOOGLE_PROTOBUF_TARGET_ARCH_IA32) && \
+    !defined(GOOGLE_PROTOBUF_HOST_ARCH_IA32)
+#error Target architecture ia32 is only supported on ia32 host
+#endif
+#if defined(GOOGLE_PROTOBUF_TARGET_ARCH_X64) && \
+    !defined(GOOGLE_PROTOBUF_HOST_ARCH_X64)
+#error Target architecture x64 is only supported on x64 host
+#endif
+#if (defined(GOOGLE_PROTOBUF_TARGET_ARCH_ARM) && \
+    !(defined(GOOGLE_PROTOBUF_HOST_ARCH_IA32) || \
+      defined(GOOGLE_PROTOBUF_HOST_ARCH_ARM)))
+#error Target architecture arm is only supported on arm and ia32 host
+#endif
+#if (defined(GOOGLE_PROTOBUF_TARGET_ARCH_MIPS) && \
+    !(defined(GOOGLE_PROTOBUF_HOST_ARCH_IA32) || \
+      defined(GOOGLE_PROTOBUF_HOST_ARCH_MIPS)))
+#error Target architecture mips is only supported on mips and ia32 host
+#endif
+
+// Define unaligned read for the target architectures supporting it.
+#if defined(GOOGLE_PROTOBUF_TARGET_ARCH_X64) || \
+    defined(GOOGLE_PROTOBUF_TARGET_ARCH_IA32)
+#define GOOGLE_PROTOBUF_TARGET_CAN_READ_UNALIGNED 1
+#elif GOOGLE_PROTOBUF_TARGET_ARCH_ARM
+// Some CPU-OS combinations allow unaligned access on ARM. We assume
+// that unaligned accesses are not allowed unless the build system
+// defines the CAN_USE_UNALIGNED_ACCESSES macro to be non-zero.
+#if CAN_USE_UNALIGNED_ACCESSES
+#define GOOGLE_PROTOBUF_TARGET_CAN_READ_UNALIGNED 1
+#endif
+#elif GOOGLE_PROTOBUF_TARGET_ARCH_MIPS
+#else
+#error Target architecture is not supported by v8
+#endif
+
+#if (defined(__APPLE__) && defined(__MACH__)) || \
+    defined(__FreeBSD__) || defined(__OpenBSD__)
+#define GOOGLE_PROTOBUF_USING_BSD_ABI
+#endif
+
+#endif  // GOOGLE_PROTOBUF_PLATFORM_MACROS_H_