411 lines
12 KiB
C++
411 lines
12 KiB
C++
// Protocol Buffers - Google's data interchange format
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// Copyright 2008 Google Inc. All rights reserved.
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// https://developers.google.com/protocol-buffers/
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following disclaimer
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// in the documentation and/or other materials provided with the
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// distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived from
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// this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#ifndef GOOGLE_PROTOBUF_STUBS_PORT_H_
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#define GOOGLE_PROTOBUF_STUBS_PORT_H_
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#include <assert.h>
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#include <cstdint>
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#include <stdlib.h>
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#include <cstddef>
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#include <string>
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#include <string.h>
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#include <google/protobuf/stubs/platform_macros.h>
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#include <google/protobuf/port_def.inc>
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#undef PROTOBUF_LITTLE_ENDIAN
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#ifdef _WIN32
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// Assuming windows is always little-endian.
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// TODO(xiaofeng): The PROTOBUF_LITTLE_ENDIAN is not only used for
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// optimization but also for correctness. We should define an
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// different macro to test the big-endian code path in coded_stream.
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#if !defined(PROTOBUF_DISABLE_LITTLE_ENDIAN_OPT_FOR_TEST)
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#define PROTOBUF_LITTLE_ENDIAN 1
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#endif
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#if defined(_MSC_VER) && _MSC_VER >= 1300 && !defined(__INTEL_COMPILER)
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// If MSVC has "/RTCc" set, it will complain about truncating casts at
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// runtime. This file contains some intentional truncating casts.
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#pragma runtime_checks("c", off)
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#endif
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#else
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#ifdef __APPLE__
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#include <machine/endian.h> // __BYTE_ORDER
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#elif defined(__FreeBSD__)
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#include <sys/endian.h> // __BYTE_ORDER
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#else
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#if !defined(__QNX__)
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#include <endian.h> // __BYTE_ORDER
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#endif
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#endif
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#if ((defined(__LITTLE_ENDIAN__) && !defined(__BIG_ENDIAN__)) || \
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(defined(__BYTE_ORDER) && __BYTE_ORDER == __LITTLE_ENDIAN) || \
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(defined(BYTE_ORDER) && BYTE_ORDER == LITTLE_ENDIAN)) && \
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!defined(PROTOBUF_DISABLE_LITTLE_ENDIAN_OPT_FOR_TEST)
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#define PROTOBUF_LITTLE_ENDIAN 1
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#endif
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#endif
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// These #includes are for the byte swap functions declared later on.
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#ifdef _MSC_VER
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#include <stdlib.h> // NOLINT(build/include)
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#include <intrin.h>
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#elif defined(__APPLE__)
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#include <libkern/OSByteOrder.h>
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#elif defined(__linux__) || defined(__ANDROID__) || defined(__CYGWIN__)
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#include <byteswap.h> // IWYU pragma: export
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#endif
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// Legacy: some users reference these (internal-only) macros even though we
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// don't need them any more.
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#if defined(_MSC_VER) && defined(PROTOBUF_USE_DLLS)
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#ifdef LIBPROTOBUF_EXPORTS
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#define LIBPROTOBUF_EXPORT __declspec(dllexport)
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#else
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#define LIBPROTOBUF_EXPORT __declspec(dllimport)
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#endif
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#ifdef LIBPROTOC_EXPORTS
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#define LIBPROTOC_EXPORT __declspec(dllexport)
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#else
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#define LIBPROTOC_EXPORT __declspec(dllimport)
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#endif
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#else
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#define LIBPROTOBUF_EXPORT
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#define LIBPROTOC_EXPORT
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#endif
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#define PROTOBUF_RUNTIME_DEPRECATED(message) PROTOBUF_DEPRECATED_MSG(message)
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#define GOOGLE_PROTOBUF_RUNTIME_DEPRECATED(message) \
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PROTOBUF_DEPRECATED_MSG(message)
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// ===================================================================
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// from google3/base/port.h
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#if (defined(__GXX_EXPERIMENTAL_CXX0X__) || __cplusplus >= 201103L || \
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(defined(_MSC_VER) && _MSC_VER >= 1900))
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// Define this to 1 if the code is compiled in C++11 mode; leave it
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// undefined otherwise. Do NOT define it to 0 -- that causes
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// '#ifdef LANG_CXX11' to behave differently from '#if LANG_CXX11'.
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#define LANG_CXX11 1
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#else
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#error "Protobuf requires at least C++11."
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#endif
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namespace google {
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namespace protobuf {
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using ConstStringParam = const std::string &;
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typedef unsigned int uint;
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typedef int8_t int8;
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typedef int16_t int16;
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typedef int32_t int32;
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typedef int64_t int64;
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typedef uint8_t uint8;
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typedef uint16_t uint16;
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typedef uint32_t uint32;
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typedef uint64_t uint64;
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static const int32 kint32max = 0x7FFFFFFF;
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static const int32 kint32min = -kint32max - 1;
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static const int64 kint64max = int64_t{0x7FFFFFFFFFFFFFFF};
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static const int64 kint64min = -kint64max - 1;
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static const uint32 kuint32max = 0xFFFFFFFFu;
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static const uint64 kuint64max = uint64_t{0xFFFFFFFFFFFFFFFFu};
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#if defined(ADDRESS_SANITIZER) || defined(THREAD_SANITIZER) ||\
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defined(MEMORY_SANITIZER)
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#ifdef __cplusplus
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extern "C" {
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#endif // __cplusplus
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uint16_t __sanitizer_unaligned_load16(const void *p);
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uint32_t __sanitizer_unaligned_load32(const void *p);
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uint64_t __sanitizer_unaligned_load64(const void *p);
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void __sanitizer_unaligned_store16(void *p, uint16_t v);
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void __sanitizer_unaligned_store32(void *p, uint32_t v);
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void __sanitizer_unaligned_store64(void *p, uint64_t v);
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#ifdef __cplusplus
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} // extern "C"
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#endif // __cplusplus
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inline uint16 GOOGLE_UNALIGNED_LOAD16(const void *p) {
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return __sanitizer_unaligned_load16(p);
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}
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inline uint32 GOOGLE_UNALIGNED_LOAD32(const void *p) {
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return __sanitizer_unaligned_load32(p);
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}
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inline uint64 GOOGLE_UNALIGNED_LOAD64(const void *p) {
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return __sanitizer_unaligned_load64(p);
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}
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inline void GOOGLE_UNALIGNED_STORE16(void *p, uint16 v) {
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__sanitizer_unaligned_store16(p, v);
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}
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inline void GOOGLE_UNALIGNED_STORE32(void *p, uint32 v) {
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__sanitizer_unaligned_store32(p, v);
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}
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inline void GOOGLE_UNALIGNED_STORE64(void *p, uint64 v) {
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__sanitizer_unaligned_store64(p, v);
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}
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#elif defined(GOOGLE_PROTOBUF_USE_UNALIGNED) && GOOGLE_PROTOBUF_USE_UNALIGNED
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#define GOOGLE_UNALIGNED_LOAD16(_p) (*reinterpret_cast<const uint16 *>(_p))
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#define GOOGLE_UNALIGNED_LOAD32(_p) (*reinterpret_cast<const uint32 *>(_p))
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#define GOOGLE_UNALIGNED_LOAD64(_p) (*reinterpret_cast<const uint64 *>(_p))
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#define GOOGLE_UNALIGNED_STORE16(_p, _val) (*reinterpret_cast<uint16 *>(_p) = (_val))
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#define GOOGLE_UNALIGNED_STORE32(_p, _val) (*reinterpret_cast<uint32 *>(_p) = (_val))
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#define GOOGLE_UNALIGNED_STORE64(_p, _val) (*reinterpret_cast<uint64 *>(_p) = (_val))
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#else
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inline uint16 GOOGLE_UNALIGNED_LOAD16(const void *p) {
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uint16 t;
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memcpy(&t, p, sizeof t);
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return t;
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}
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inline uint32 GOOGLE_UNALIGNED_LOAD32(const void *p) {
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uint32 t;
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memcpy(&t, p, sizeof t);
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return t;
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}
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inline uint64 GOOGLE_UNALIGNED_LOAD64(const void *p) {
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uint64 t;
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memcpy(&t, p, sizeof t);
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return t;
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}
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inline void GOOGLE_UNALIGNED_STORE16(void *p, uint16 v) {
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memcpy(p, &v, sizeof v);
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}
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inline void GOOGLE_UNALIGNED_STORE32(void *p, uint32 v) {
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memcpy(p, &v, sizeof v);
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}
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inline void GOOGLE_UNALIGNED_STORE64(void *p, uint64 v) {
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memcpy(p, &v, sizeof v);
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}
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#endif
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#if defined(GOOGLE_PROTOBUF_OS_NACL) \
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|| (defined(__ANDROID__) && defined(__clang__) \
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&& (__clang_major__ == 3 && __clang_minor__ == 8) \
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&& (__clang_patchlevel__ < 275480))
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# define GOOGLE_PROTOBUF_USE_PORTABLE_LOG2
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#endif
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// The following guarantees declaration of the byte swap functions.
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#ifdef _MSC_VER
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#define bswap_16(x) _byteswap_ushort(x)
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#define bswap_32(x) _byteswap_ulong(x)
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#define bswap_64(x) _byteswap_uint64(x)
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#elif defined(__APPLE__)
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// Mac OS X / Darwin features
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#define bswap_16(x) OSSwapInt16(x)
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#define bswap_32(x) OSSwapInt32(x)
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#define bswap_64(x) OSSwapInt64(x)
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#elif !defined(__linux__) && !defined(__ANDROID__) && !defined(__CYGWIN__)
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#ifndef bswap_16
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static inline uint16 bswap_16(uint16 x) {
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return static_cast<uint16>(((x & 0xFF) << 8) | ((x & 0xFF00) >> 8));
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}
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#define bswap_16(x) bswap_16(x)
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#endif
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#ifndef bswap_32
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static inline uint32 bswap_32(uint32 x) {
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return (((x & 0xFF) << 24) |
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((x & 0xFF00) << 8) |
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((x & 0xFF0000) >> 8) |
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((x & 0xFF000000) >> 24));
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}
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#define bswap_32(x) bswap_32(x)
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#endif
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#ifndef bswap_64
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static inline uint64 bswap_64(uint64 x) {
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return (((x & uint64_t{0xFFu}) << 56) |
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((x & uint64_t{0xFF00u}) << 40) |
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((x & uint64_t{0xFF0000u}) << 24) |
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((x & uint64_t{0xFF000000u}) << 8) |
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((x & uint64_t{0xFF00000000u}) >> 8) |
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((x & uint64_t{0xFF0000000000u}) >> 24) |
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((x & uint64_t{0xFF000000000000u}) >> 40) |
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((x & uint64_t{0xFF00000000000000u}) >> 56));
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}
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#define bswap_64(x) bswap_64(x)
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#endif
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#endif
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// ===================================================================
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// from google3/util/bits/bits.h
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class Bits {
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public:
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static uint32 Log2FloorNonZero(uint32 n) {
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#if defined(__GNUC__)
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return 31 ^ static_cast<uint32>(__builtin_clz(n));
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#elif defined(_MSC_VER)
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unsigned long where;
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_BitScanReverse(&where, n);
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return where;
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#else
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return Log2FloorNonZero_Portable(n);
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#endif
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}
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static uint32 Log2FloorNonZero64(uint64 n) {
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// Older versions of clang run into an instruction-selection failure when
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// it encounters __builtin_clzll:
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// https://bugs.chromium.org/p/nativeclient/issues/detail?id=4395
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// This includes arm-nacl-clang and clang in older Android NDK versions.
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// To work around this, when we build with those we use the portable
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// implementation instead.
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#if defined(__GNUC__) && !defined(GOOGLE_PROTOBUF_USE_PORTABLE_LOG2)
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return 63 ^ static_cast<uint32>(__builtin_clzll(n));
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#elif defined(_MSC_VER) && defined(_M_X64)
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unsigned long where;
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_BitScanReverse64(&where, n);
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return where;
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#else
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return Log2FloorNonZero64_Portable(n);
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#endif
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}
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private:
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static int Log2FloorNonZero_Portable(uint32 n) {
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if (n == 0)
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return -1;
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int log = 0;
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uint32 value = n;
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for (int i = 4; i >= 0; --i) {
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int shift = (1 << i);
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uint32 x = value >> shift;
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if (x != 0) {
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value = x;
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log += shift;
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}
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}
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assert(value == 1);
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return log;
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}
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static int Log2FloorNonZero64_Portable(uint64 n) {
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const uint32 topbits = static_cast<uint32>(n >> 32);
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if (topbits == 0) {
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// Top bits are zero, so scan in bottom bits
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return static_cast<int>(Log2FloorNonZero(static_cast<uint32>(n)));
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} else {
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return 32 + static_cast<int>(Log2FloorNonZero(topbits));
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}
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}
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};
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// ===================================================================
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// from google3/util/endian/endian.h
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PROTOBUF_EXPORT uint32 ghtonl(uint32 x);
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class BigEndian {
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public:
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#ifdef PROTOBUF_LITTLE_ENDIAN
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static uint16 FromHost16(uint16 x) { return bswap_16(x); }
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static uint16 ToHost16(uint16 x) { return bswap_16(x); }
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static uint32 FromHost32(uint32 x) { return bswap_32(x); }
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static uint32 ToHost32(uint32 x) { return bswap_32(x); }
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static uint64 FromHost64(uint64 x) { return bswap_64(x); }
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static uint64 ToHost64(uint64 x) { return bswap_64(x); }
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static bool IsLittleEndian() { return true; }
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#else
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static uint16 FromHost16(uint16 x) { return x; }
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static uint16 ToHost16(uint16 x) { return x; }
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static uint32 FromHost32(uint32 x) { return x; }
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static uint32 ToHost32(uint32 x) { return x; }
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static uint64 FromHost64(uint64 x) { return x; }
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static uint64 ToHost64(uint64 x) { return x; }
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static bool IsLittleEndian() { return false; }
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#endif /* ENDIAN */
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// Functions to do unaligned loads and stores in big-endian order.
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static uint16 Load16(const void *p) {
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return ToHost16(GOOGLE_UNALIGNED_LOAD16(p));
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}
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static void Store16(void *p, uint16 v) {
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GOOGLE_UNALIGNED_STORE16(p, FromHost16(v));
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}
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static uint32 Load32(const void *p) {
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return ToHost32(GOOGLE_UNALIGNED_LOAD32(p));
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}
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static void Store32(void *p, uint32 v) {
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GOOGLE_UNALIGNED_STORE32(p, FromHost32(v));
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}
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static uint64 Load64(const void *p) {
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return ToHost64(GOOGLE_UNALIGNED_LOAD64(p));
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}
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static void Store64(void *p, uint64 v) {
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GOOGLE_UNALIGNED_STORE64(p, FromHost64(v));
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}
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};
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} // namespace protobuf
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} // namespace google
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#include <google/protobuf/port_undef.inc>
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#endif // GOOGLE_PROTOBUF_STUBS_PORT_H_
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