forked from OctaForge/libostd
225 lines
5.3 KiB
C++
225 lines
5.3 KiB
C++
/* Platform specific definitions for OctaSTD.
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*
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* This file is part of OctaSTD. See COPYING.md for futher information.
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*/
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#ifndef OSTD_PLATFORM_HH
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#define OSTD_PLATFORM_HH
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#include <stdlib.h>
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#include <cstdint>
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#include <type_traits>
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#if defined(WIN32) || defined(_WIN32) || (defined(__WIN32) && !defined(__CYGWIN__))
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# define OSTD_PLATFORM_WIN32 1
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# if defined(WIN64) || defined(_WIN64)
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# define OSTD_PLATFORM_WIN64 1
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# endif
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#else
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# define OSTD_PLATFORM_POSIX 1
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# if defined(__linux__)
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# define OSTD_PLATFORM_LINUX 1
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# endif
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# if defined(__APPLE__)
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# define OSTD_PLATFORM_OSX 1
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# endif
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# if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
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# define OSTD_PLATFORM_FREEBSD 1
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# define OSTD_PLATFORM_BSD 1
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# endif
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# if defined(__NetBSD__)
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# define OSTD_PLATFORM_NETBSD 1
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# define OSTD_PLATFORM_BSD 1
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# endif
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# if defined(__OpenBSD__)
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# define OSTD_PLATFORM_OPENBSD 1
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# define OSTD_PLATFORM_BSD 1
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# endif
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# if defined(__DragonFly__)
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# define OSTD_PLATFORM_DRAGONFLYBSD 1
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# define OSTD_PLATFORM_BSD 1
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# endif
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# if defined(sun) || defined(__sun)
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# define OSTD_PLATFORM_SOLARIS 1
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# endif
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#endif
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#if defined(__clang__)
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# define OSTD_TOOLCHAIN_CLANG 1
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#endif
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#if defined(__GNUC__)
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# define OSTD_TOOLCHAIN_GNU 1
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#endif
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#if defined(_MSC_VER)
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# define OSTD_TOOLCHAIN_MSVC 1
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#endif
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#define OSTD_ENDIAN_LIL 1234
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#define OSTD_ENDIAN_BIG 4321
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#ifdef OSTD_PLATFORM_LINUX
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# include <endian.h>
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# define OSTD_BYTE_ORDER __BYTE_ORDER
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#else
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# if defined(__BIG_ENDIAN__) || defined(__ARMEB__) || defined(__THUMBEB__) || \
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defined(__AARCH64EB__) || defined(__MIPSEB__) || defined(__MIPSEB) || \
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defined(_MIPSEB) || defined(__ppc__) || defined(__POWERPC__) || \
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defined(_M_PPC) || defined(__sparc__)
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# define OSTD_BYTE_ORDER OSTD_ENDIAN_BIG
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# else
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# define OSTD_BYTE_ORDER OSTD_ENDIAN_LIL
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# endif
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#endif
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#ifdef OSTD_PLATFORM_WIN32
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# ifdef OSTD_LIBRARY_DLL
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# ifdef OSTD_TOOLCHAIN_GNU
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# define OSTD_EXPORT __attribute__((dllexport))
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# else
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# define OSTD_EXPORT __declspec(dllexport)
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# endif
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# else
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# ifdef OSTD_TOOLCHAIN_GNU
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# define OSTD_EXPORT __attribute__((dllimport))
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# else
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# define OSTD_EXPORT __declspec(dllimport)
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# endif
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# endif
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# define OSTD_LOCAL
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#else
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# if __GNUC__ >= 4
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# define OSTD_EXPORT __attribute__((visibility("default")))
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# define OSTD_LOCAL __attribute__((visibility("hidden")))
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# else
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# define OSTD_EXPORT
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# define OSTD_LOCAL
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# endif
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#endif
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#if defined(OSTD_PLATFORM_WIN32) && !defined(OSTD_PLATFORM_WIN64)
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# define OSTD_CDECL __cdecl
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#else
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# define OSTD_CDECL
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#endif
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namespace ostd {
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#if defined(OSTD_TOOLCHAIN_GNU)
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/* using gcc/clang builtins */
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inline std::uint16_t endian_swap16(std::uint16_t x) noexcept {
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return __builtin_bswap16(x);
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}
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inline std::uint32_t endian_swap32(std::uint32_t x) noexcept {
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return __builtin_bswap32(x);
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}
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inline std::uint64_t endian_swap64(std::uint64_t x) noexcept {
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return __builtin_bswap64(x);
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}
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#elif defined(OSTD_TOOLCHAIN_MSVC)
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/* using msvc builtins */
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inline std::uint16_t endian_swap16(std::uint16_t x) noexcept {
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return _byteswap_ushort(x);
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}
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inline std::uint32_t endian_swap32(std::uint32_t x) noexcept {
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/* win64 is llp64 */
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return _byteswap_ulong(x);
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}
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inline std::uint64_t endian_swap64(std::uint64_t x) noexcept {
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return _byteswap_uint64(x);
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}
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#else
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/* fallback */
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inline std::uint16_t endian_swap16(std::uint16_t x) noexcept {
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return (x << 8) | (x >> 8);
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}
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inline std::uint32_t endian_swap32(std::uint32_t x) noexcept {
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return (x << 24) | (x >> 24) | ((x >> 8) & 0xFF00) | ((x << 8) & 0xFF0000);
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}
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inline std::uint64_t endian_swap64(std::uint64_t x) noexcept {
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return endian_swap32(
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std::uint32_t(x >> 32)) |
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(std::uint64_t(endian_swap32(std::uint32_t(x))) << 32
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);
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}
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#endif
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/* endian swap */
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template<typename T, size_t N = sizeof(T), bool IsNum = std::is_arithmetic_v<T>>
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struct endian_swap;
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template<typename T>
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struct endian_swap<T, 2, true> {
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T operator()(T v) const {
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union { T iv; std::uint16_t sv; } u;
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u.iv = v;
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u.sv = endian_swap16(u.sv);
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return u.iv;
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}
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};
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template<typename T>
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struct endian_swap<T, 4, true> {
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T operator()(T v) const {
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union { T iv; std::uint32_t sv; } u;
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u.iv = v;
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u.sv = endian_swap32(u.sv);
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return u.iv;
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}
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};
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template<typename T>
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struct endian_swap<T, 8, true> {
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T operator()(T v) const {
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union { T iv; std::uint64_t sv; } u;
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u.iv = v;
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u.sv = endian_swap64(u.sv);
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return u.iv;
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}
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};
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namespace detail {
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template<
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typename T, size_t N = sizeof(T), bool IsNum = std::is_arithmetic_v<T>
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>
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struct endian_same;
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template<typename T>
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struct endian_same<T, 2, true> {
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T operator()(T v) const { return v; }
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};
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template<typename T>
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struct endian_same<T, 4, true> {
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T operator()(T v) const { return v; }
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};
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template<typename T>
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struct endian_same<T, 8, true> {
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T operator()(T v) const { return v; }
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};
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}
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#if OSTD_BYTE_ORDER == OSTD_ENDIAN_LIL
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template<typename T>
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struct from_lil_endian: detail::endian_same<T> {};
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template<typename T>
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struct from_big_endian: endian_swap<T> {};
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#else
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template<typename T>
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struct from_lil_endian: endian_swap<T> {};
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template<typename T>
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struct from_big_endian: detail::endian_same<T> {};
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#endif
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}
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#endif
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