mirror of
https://github.com/isar/libmdbx.git
synced 2024-10-30 11:29:19 +08:00
338 lines
9.6 KiB
C++
338 lines
9.6 KiB
C++
/*
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* Copyright 2017-2019 Leonid Yuriev <leo@yuriev.ru>
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* and other libmdbx authors: please see AUTHORS file.
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* All rights reserved.
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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 only as authorized by the OpenLDAP
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* Public License.
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*
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* A copy of this license is available in the file LICENSE in the
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* top-level directory of the distribution or, alternatively, at
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* <http://www.OpenLDAP.org/license.html>.
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*/
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#pragma once
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#include "base.h"
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#if !defined(__BYTE_ORDER__) || !defined(__ORDER_LITTLE_ENDIAN__) || \
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!defined(__ORDER_BIG_ENDIAN__)
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#error __BYTE_ORDER__ should be defined.
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#endif
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#if __BYTE_ORDER__ != __ORDER_LITTLE_ENDIAN__ && \
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__BYTE_ORDER__ != __ORDER_BIG_ENDIAN__
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#error Unsupported byte order.
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#endif
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#if __GNUC_PREREQ(4, 4) || defined(__clang__)
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#define bswap64(v) __builtin_bswap64(v)
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#define bswap32(v) __builtin_bswap32(v)
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#if __GNUC_PREREQ(4, 8) || __has_builtin(__builtin_bswap16)
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#define bswap16(v) __builtin_bswap16(v)
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#endif
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#elif defined(_MSC_VER)
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#if _MSC_FULL_VER < 190024215
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#pragma message( \
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"It is recommended to use Visual Studio 2015 (MSC 19.0) or newer.")
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#endif
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#define bswap64(v) _byteswap_uint64(v)
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#define bswap32(v) _byteswap_ulong(v)
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#define bswap16(v) _byteswap_ushort(v)
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#define rot64(v, s) _rotr64(v, s)
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#define rot32(v, s) _rotr(v, s)
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#if defined(_M_ARM64) || defined(_M_X64) || defined(_M_IA64)
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#pragma intrinsic(_umul128)
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#define mul_64x64_128(a, b, ph) _umul128(a, b, ph)
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#pragma intrinsic(__umulh)
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#define mul_64x64_high(a, b) __umulh(a, b)
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#endif
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#if defined(_M_IX86)
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#pragma intrinsic(__emulu)
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#define mul_32x32_64(a, b) __emulu(a, b)
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#elif defined(_M_ARM)
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#define mul_32x32_64(a, b) _arm_umull(a, b)
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#endif
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#endif /* compiler */
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#ifndef bswap64
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#ifdef __bswap_64
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#define bswap64(v) __bswap_64(v)
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#else
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static __inline uint64_t bswap64(uint64_t v) {
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return v << 56 | v >> 56 | ((v << 40) & UINT64_C(0x00ff000000000000)) |
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((v << 24) & UINT64_C(0x0000ff0000000000)) |
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((v << 8) & UINT64_C(0x000000ff00000000)) |
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((v >> 8) & UINT64_C(0x00000000ff0000000)) |
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((v >> 24) & UINT64_C(0x0000000000ff0000)) |
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((v >> 40) & UINT64_C(0x000000000000ff00));
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}
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#endif
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#endif /* bswap64 */
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#ifndef bswap32
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#ifdef __bswap_32
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#define bswap32(v) __bswap_32(v)
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#else
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static __inline uint32_t bswap32(uint32_t v) {
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return v << 24 | v >> 24 | ((v << 8) & UINT32_C(0x00ff0000)) |
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((v >> 8) & UINT32_C(0x0000ff00));
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}
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#endif
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#endif /* bswap32 */
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#ifndef bswap16
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#ifdef __bswap_16
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#define bswap16(v) __bswap_16(v)
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#else
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static __inline uint16_t bswap16(uint16_t v) { return v << 8 | v >> 8; }
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#endif
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#endif /* bswap16 */
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#define is_byteorder_le() (__BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__)
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#define is_byteorder_be() (__BYTE_ORDER__ == __ORDER_BIG_ENDIAN__)
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#ifndef htole16
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#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
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#define htobe16(v) bswap16(v)
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#define htole16(v) (v)
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#define be16toh(v) bswap16(v)
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#define le16toh(v) (v)
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#else
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#define htobe16(v) (v)
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#define htole16(v) bswap16(v)
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#define be16toh(v) (v)
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#define le16toh(v) bswap16(v)
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#endif
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#endif /* htole16 */
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#ifndef htole32
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#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
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#define htobe32(v) bswap32(v)
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#define htole32(v) (v)
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#define be32toh(v) bswap32(v)
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#define le32toh(v) (v)
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#else
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#define htobe32(v) (v)
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#define htole32(v) bswap32(v)
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#define be32toh(v) (v)
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#define le32toh(v) bswap32(v)
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#endif
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#endif /* htole32 */
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#ifndef htole64
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#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
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#define htobe64(v) bswap64(v)
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#define htole64(v) (v)
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#define be64toh(v) bswap64(v)
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#define le64toh(v) (v)
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#else
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#define htobe64(v) (v)
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#define htole64(v) bswap_64(v)
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#define be64toh(v) (v)
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#define le64toh(v) bswap_64(v)
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#endif
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#endif /* htole64 */
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namespace unaligned {
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template <typename T> static __inline T load(const void *ptr) {
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#if defined(_MSC_VER) && \
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(defined(_M_ARM64) || defined(_M_X64) || defined(_M_IA64))
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return *(const T __unaligned *)ptr;
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#elif UNALIGNED_OK
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return *(const T *)ptr;
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#else
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T local;
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#if defined(__GNUC__) || defined(__clang__)
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__builtin_memcpy(&local, (const T *)ptr, sizeof(T));
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#else
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memcpy(&local, (const T *)ptr, sizeof(T));
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#endif /* __GNUC__ || __clang__ */
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return local;
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#endif /* UNALIGNED_OK */
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}
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template <typename T> static __inline void store(void *ptr, const T &value) {
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#if defined(_MSC_VER) && \
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(defined(_M_ARM64) || defined(_M_X64) || defined(_M_IA64))
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*((T __unaligned *)ptr) = value;
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#elif UNALIGNED_OK
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*(volatile T *)ptr = value;
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#else
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#if defined(__GNUC__) || defined(__clang__)
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__builtin_memcpy(ptr, &value, sizeof(T));
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#else
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memcpy(ptr, &value, sizeof(T));
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#endif /* __GNUC__ || __clang__ */
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#endif /* UNALIGNED_OK */
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}
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} /* namespace unaligned */
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//-----------------------------------------------------------------------------
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#ifndef rot64
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static __inline uint64_t rot64(uint64_t v, unsigned s) {
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return (v >> s) | (v << (64 - s));
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}
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#endif /* rot64 */
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#ifndef mul_32x32_64
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static __inline uint64_t mul_32x32_64(uint32_t a, uint32_t b) {
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return a * (uint64_t)b;
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}
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#endif /* mul_32x32_64 */
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#ifndef mul_64x64_128
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static __inline unsigned add_with_carry(uint64_t *sum, uint64_t addend) {
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*sum += addend;
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return (*sum < addend) ? 1u : 0u;
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}
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static __inline uint64_t mul_64x64_128(uint64_t a, uint64_t b, uint64_t *h) {
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#if defined(__SIZEOF_INT128__) || \
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(defined(_INTEGRAL_MAX_BITS) && _INTEGRAL_MAX_BITS >= 128)
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__uint128_t r = (__uint128_t)a * (__uint128_t)b;
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/* modern GCC could nicely optimize this */
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*h = r >> 64;
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return r;
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#elif defined(mul_64x64_high)
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*h = mul_64x64_high(a, b);
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return a * b;
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#else
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/* performs 64x64 to 128 bit multiplication */
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uint64_t ll = mul_32x32_64((uint32_t)a, (uint32_t)b);
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uint64_t lh = mul_32x32_64(a >> 32, (uint32_t)b);
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uint64_t hl = mul_32x32_64((uint32_t)a, b >> 32);
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*h = mul_32x32_64(a >> 32, b >> 32) + (lh >> 32) + (hl >> 32) +
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add_with_carry(&ll, lh << 32) + add_with_carry(&ll, hl << 32);
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return ll;
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#endif
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}
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#endif /* mul_64x64_128() */
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#ifndef mul_64x64_high
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static __inline uint64_t mul_64x64_high(uint64_t a, uint64_t b) {
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uint64_t h;
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mul_64x64_128(a, b, &h);
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return h;
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}
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#endif /* mul_64x64_high */
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static __inline bool is_power2(size_t x) { return (x & (x - 1)) == 0; }
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static __inline size_t roundup2(size_t value, size_t granularity) {
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assert(is_power2(granularity));
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return (value + granularity - 1) & ~(granularity - 1);
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}
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//-----------------------------------------------------------------------------
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static __inline void memory_barrier(void) {
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#if __has_extension(c_atomic) || __has_extension(cxx_atomic)
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__c11_atomic_thread_fence(__ATOMIC_SEQ_CST);
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#elif defined(__ATOMIC_SEQ_CST)
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__atomic_thread_fence(__ATOMIC_SEQ_CST);
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#elif defined(__clang__) || defined(__GNUC__)
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__sync_synchronize();
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#elif defined(_MSC_VER)
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MemoryBarrier();
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#elif defined(__INTEL_COMPILER) /* LY: Intel Compiler may mimic GCC and MSC */
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#if defined(__ia64__) || defined(__ia64) || defined(_M_IA64)
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__mf();
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#elif defined(__ia32__)
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_mm_mfence();
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#else
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#error "Unknown target for Intel Compiler, please report to us."
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#endif
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#elif defined(__SUNPRO_C) || defined(__sun) || defined(sun)
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__machine_rw_barrier();
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#elif (defined(_HPUX_SOURCE) || defined(__hpux) || defined(__HP_aCC)) && \
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(defined(HP_IA64) || defined(__ia64))
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_Asm_mf();
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#elif defined(_AIX) || defined(__ppc__) || defined(__powerpc__) || \
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defined(__ppc64__) || defined(__powerpc64__)
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__lwsync();
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#else
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#error "Could not guess the kind of compiler, please report to us."
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#endif
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}
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static __inline void cpu_relax() {
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#if defined(__ia32__)
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_mm_pause();
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#elif defined(_WIN32) || defined(_WIN64) || defined(_WINDOWS) || \
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defined(YieldProcessor)
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YieldProcessor();
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#else
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/* nope */
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#endif
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}
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//-----------------------------------------------------------------------------
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struct simple_checksum {
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uint64_t value;
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simple_checksum() : value(0) {}
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void push(uint32_t data) {
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value += data * UINT64_C(9386433910765580089) + 1;
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value ^= value >> 41;
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}
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void push(uint64_t data) {
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push((uint32_t)data);
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push((uint32_t)(data >> 32));
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}
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void push(bool data) { push(data ? UINT32_C(0x780E) : UINT32_C(0xFA18E)); }
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void push(const void *ptr, size_t bytes) {
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const uint8_t *data = (const uint8_t *)ptr;
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for (size_t i = 0; i < bytes; ++i)
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push((uint32_t)data[i]);
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}
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void push(const double &data) { push(&data, sizeof(double)); }
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void push(const char *cstr) { push(cstr, strlen(cstr)); }
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void push(const std::string &str) { push(str.data(), str.size()); }
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#if defined(_WIN32) || defined(_WIN64) || defined(_WINDOWS)
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void push(const HANDLE &handle) { push(&handle, sizeof(handle)); }
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#endif /* _WINDOWS */
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};
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std::string data2hex(const void *ptr, size_t bytes, simple_checksum &checksum);
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bool hex2data(const char *hex_begin, const char *hex_end, void *ptr,
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size_t bytes, simple_checksum &checksum);
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bool is_samedata(const MDBX_val *a, const MDBX_val *b);
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std::string format(const char *fmt, ...);
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uint64_t entropy_ticks(void);
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uint64_t entropy_white(void);
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uint64_t prng64_careless(uint64_t &state);
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uint64_t prng64_white(uint64_t &state);
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uint32_t prng32(uint64_t &state);
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void prng_fill(uint64_t &state, void *ptr, size_t bytes);
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void prng_seed(uint64_t seed);
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uint32_t prng32(void);
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uint64_t prng64(void);
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void prng_fill(void *ptr, size_t bytes);
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bool flipcoin();
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bool jitter(unsigned probability_percent);
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void jitter_delay(bool extra = false);
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