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65 lines
1.8 KiB
C
65 lines
1.8 KiB
C
/* SPDX-FileCopyrightText: © 2022 Decompollaborate */
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/* SPDX-License-Identifier: MIT */
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#ifndef RABBITIZER_UTILS_H
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#define RABBITIZER_UTILS_H
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#include <stddef.h>
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#include <stdint.h>
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#if !defined(__GNUC__) && !defined(__clang__)
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#define __attribute__(x)
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#endif
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#if __STDC_VERSION__ >= 202300L
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#define DEPRECATED(reason) [[deprecated (reason)]]
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#define FALLTHROUGH [[fallthrough]]
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#define NODISCARD(reason) [[nodiscard (reason)]]
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#define NORETURN [[noreturn]]
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#define UNUSED [[maybe_unused]]
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#else
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#define DEPRECATED(reason) __attribute__((deprecated (reason)))
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#define FALLTHROUGH __attribute__((fallthrough))
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#define NODISCARD(reason) __attribute__((warn_unused_result))
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#define NORETURN _Noreturn
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#define UNUSED __attribute__((unused))
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#endif
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#if defined(_MSC_VER)
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# define UNREACHABLE __assume(0)
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#else
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# define UNREACHABLE __builtin_unreachable()
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#endif
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#define PURE __attribute__((pure))
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#define ARRAY_COUNT(arr) (sizeof(arr) / sizeof(arr[0]))
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#define MASK(v, w) ((v) & ((1 << (w)) - 1))
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/*
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* the SHIFT macros take a value, a shift amount, and a width.
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*
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* For the left shift, the lower bits of the value are masked,
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* then shifted left.
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*
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* For the right shift, the value is shifted right, then the lower bits
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* are masked.
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*
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* (NOTE: SHIFTL(v, 0, 32) won't work, just use an assignment)
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*
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*/
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#define SHIFTL(v, s, w) (MASK((v), (w)) << (s))
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#define SHIFTR(v, s, w) (MASK((v) >> (s), (w)))
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#define BITREPACK(fullword, v, s, w) ((SHIFTR((fullword), (s)+(w), 32-((s)+(w))) << ((s)+(w))) | SHIFTL((v), (s), (w)) | MASK((fullword), (s)))
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#define BITREPACK_RIGHT(fullword, v, s, w) (SHIFTL((v), (s), (w)) | MASK((fullword), (s)))
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int32_t RabbitizerUtils_From2Complement(uint32_t number, int bits);
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size_t RabbitizerUtils_CharFill(char *dst, int count, char fillchar);
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#endif
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