derek.holloway
7502bf64a4
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92 lines
3.9 KiB
C
92 lines
3.9 KiB
C
//===-- Definition of macros from endian.h --------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef __CLANG_ENDIAN_H
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#define __CLANG_ENDIAN_H
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// If the system has an endian.h, let's use that instead.
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#if __has_include_next(<endian.h>)
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#include_next <endian.h>
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#else
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#include <stdint.h>
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// Implementation taken from llvm libc endian-macros.h.
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#ifdef __cplusplus
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#define __CLANG_ENDIAN_CAST(cast, type, value) (cast<type>(value))
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#else
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#define __CLANG_ENDIAN_CAST(cast, type, value) ((type)(value))
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#endif
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#define LITTLE_ENDIAN __ORDER_LITTLE_ENDIAN__
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#define BIG_ENDIAN __ORDER_BIG_ENDIAN__
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#define PDP_ENDIAN __ORDER_PDP_ENDIAN__
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#define BYTE_ORDER __BYTE_ORDER__
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// Define some compatibility macros if they are not defined.
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#ifndef __BYTE_ORDER
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#define __BYTE_ORDER BYTE_ORDER
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#endif
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#ifndef __LITTLE_ENDIAN
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#define __LITTLE_ENDIAN LITTLE_ENDIAN
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#endif
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#ifndef __BIG_ENDIAN
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#define __BIG_ENDIAN BIG_ENDIAN
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#endif
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#ifndef __PDP_ENDIAN
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#define __PDP_ENDIAN PDP_ENDIAN
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#endif
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#if BYTE_ORDER == LITTLE_ENDIAN
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#define htobe16(x) \
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__builtin_bswap16(__CLANG_ENDIAN_CAST(static_cast, uint16_t, x))
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#define htobe32(x) \
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__builtin_bswap32(__CLANG_ENDIAN_CAST(static_cast, uint32_t, x))
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#define htobe64(x) \
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__builtin_bswap64(__CLANG_ENDIAN_CAST(static_cast, uint64_t, x))
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#define htole16(x) __CLANG_ENDIAN_CAST(static_cast, uint16_t, x)
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#define htole32(x) __CLANG_ENDIAN_CAST(static_cast, uint32_t, x)
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#define htole64(x) __CLANG_ENDIAN_CAST(static_cast, uint64_t, x)
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#define be16toh(x) \
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__builtin_bswap16(__CLANG_ENDIAN_CAST(static_cast, uint16_t, x))
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#define be32toh(x) \
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__builtin_bswap32(__CLANG_ENDIAN_CAST(static_cast, uint32_t, x))
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#define be64toh(x) \
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__builtin_bswap64(__CLANG_ENDIAN_CAST(static_cast, uint64_t, x))
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#define le16toh(x) __CLANG_ENDIAN_CAST(static_cast, uint16_t, x)
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#define le32toh(x) __CLANG_ENDIAN_CAST(static_cast, uint32_t, x)
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#define le64toh(x) __CLANG_ENDIAN_CAST(static_cast, uint64_t, x)
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#elif BYTE_ORDER == BIG_ENDIAN
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#define htobe16(x) __CLANG_ENDIAN_CAST(static_cast, uint16_t, x)
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#define htobe32(x) __CLANG_ENDIAN_CAST(static_cast, uint32_t, x)
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#define htobe64(x) __CLANG_ENDIAN_CAST(static_cast, uint64_t, x)
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#define htole16(x) \
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__builtin_bswap16(__CLANG_ENDIAN_CAST(static_cast, uint16_t, x))
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#define htole32(x) \
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__builtin_bswap32(__CLANG_ENDIAN_CAST(static_cast, uint32_t, x))
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#define htole64(x) \
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__builtin_bswap64(__CLANG_ENDIAN_CAST(static_cast, uint64_t, x))
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#define be16toh(x) __CLANG_ENDIAN_CAST(static_cast, uint16_t, x)
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#define be32toh(x) __CLANG_ENDIAN_CAST(static_cast, uint32_t, x)
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#define be64toh(x) __CLANG_ENDIAN_CAST(static_cast, uint64_t, x)
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#define le16toh(x) \
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__builtin_bswap16(__CLANG_ENDIAN_CAST(static_cast, uint16_t, x))
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#define le32toh(x) \
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__builtin_bswap32(__CLANG_ENDIAN_CAST(static_cast, uint32_t, x))
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#define le64toh(x) \
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__builtin_bswap64(__CLANG_ENDIAN_CAST(static_cast, uint64_t, x))
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#else
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#error "Unsupported endianness"
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#endif
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#endif // __has_include_next
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#endif // __CLANG_ENDIAN_H
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