427 lines
13 KiB
C++
427 lines
13 KiB
C++
/*
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* Copyright (c) Meta Platforms, Inc. and affiliates.
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* All rights reserved.
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*
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* This source code is licensed under both the BSD-style license (found in the
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* LICENSE file in the root directory of this source tree) and the GPLv2 (found
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* in the COPYING file in the root directory of this source tree).
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* You may select, at your option, one of the above-listed licenses.
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*/
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#ifndef MEM_H_MODULE
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#define MEM_H_MODULE
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#if defined (__cplusplus)
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extern "C" {
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#endif
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/*-****************************************
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* Dependencies
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******************************************/
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#include <stddef.h> /* size_t, ptrdiff_t */
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#include "compiler.h" /* __has_builtin */
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#include "debug.h" /* DEBUG_STATIC_ASSERT */
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#include "zstd_deps.h" /* ZSTD_memcpy */
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/*-****************************************
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* Compiler specifics
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******************************************/
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#if defined(_MSC_VER) /* Visual Studio */
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# include <stdlib.h> /* _byteswap_ulong */
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# include <intrin.h> /* _byteswap_* */
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#endif
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/*-**************************************************************
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* Basic Types
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*****************************************************************/
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#if !defined (__VMS) && (defined (__cplusplus) || (defined (__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) /* C99 */) )
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# if defined(_AIX)
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# include <inttypes.h>
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# else
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# include <stdint.h> /* intptr_t */
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# endif
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typedef uint8_t BYTE;
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typedef uint8_t U8;
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typedef int8_t S8;
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typedef uint16_t U16;
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typedef int16_t S16;
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typedef uint32_t U32;
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typedef int32_t S32;
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typedef uint64_t U64;
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typedef int64_t S64;
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#else
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# include <limits.h>
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#if CHAR_BIT != 8
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# error "this implementation requires char to be exactly 8-bit type"
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#endif
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typedef unsigned char BYTE;
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typedef unsigned char U8;
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typedef signed char S8;
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#if USHRT_MAX != 65535
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# error "this implementation requires short to be exactly 16-bit type"
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#endif
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typedef unsigned short U16;
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typedef signed short S16;
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#if UINT_MAX != 4294967295
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# error "this implementation requires int to be exactly 32-bit type"
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#endif
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typedef unsigned int U32;
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typedef signed int S32;
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/* note : there are no limits defined for long long type in C90.
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* limits exist in C99, however, in such case, <stdint.h> is preferred */
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typedef unsigned long long U64;
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typedef signed long long S64;
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#endif
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/*-**************************************************************
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* Memory I/O API
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*****************************************************************/
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/*=== Static platform detection ===*/
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MEM_STATIC unsigned MEM_32bits(void);
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MEM_STATIC unsigned MEM_64bits(void);
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MEM_STATIC unsigned MEM_isLittleEndian(void);
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/*=== Native unaligned read/write ===*/
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MEM_STATIC U16 MEM_read16(const void* memPtr);
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MEM_STATIC U32 MEM_read32(const void* memPtr);
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MEM_STATIC U64 MEM_read64(const void* memPtr);
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MEM_STATIC size_t MEM_readST(const void* memPtr);
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MEM_STATIC void MEM_write16(void* memPtr, U16 value);
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MEM_STATIC void MEM_write32(void* memPtr, U32 value);
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MEM_STATIC void MEM_write64(void* memPtr, U64 value);
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/*=== Little endian unaligned read/write ===*/
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MEM_STATIC U16 MEM_readLE16(const void* memPtr);
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MEM_STATIC U32 MEM_readLE24(const void* memPtr);
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MEM_STATIC U32 MEM_readLE32(const void* memPtr);
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MEM_STATIC U64 MEM_readLE64(const void* memPtr);
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MEM_STATIC size_t MEM_readLEST(const void* memPtr);
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MEM_STATIC void MEM_writeLE16(void* memPtr, U16 val);
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MEM_STATIC void MEM_writeLE24(void* memPtr, U32 val);
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MEM_STATIC void MEM_writeLE32(void* memPtr, U32 val32);
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MEM_STATIC void MEM_writeLE64(void* memPtr, U64 val64);
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MEM_STATIC void MEM_writeLEST(void* memPtr, size_t val);
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/*=== Big endian unaligned read/write ===*/
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MEM_STATIC U32 MEM_readBE32(const void* memPtr);
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MEM_STATIC U64 MEM_readBE64(const void* memPtr);
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MEM_STATIC size_t MEM_readBEST(const void* memPtr);
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MEM_STATIC void MEM_writeBE32(void* memPtr, U32 val32);
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MEM_STATIC void MEM_writeBE64(void* memPtr, U64 val64);
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MEM_STATIC void MEM_writeBEST(void* memPtr, size_t val);
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/*=== Byteswap ===*/
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MEM_STATIC U32 MEM_swap32(U32 in);
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MEM_STATIC U64 MEM_swap64(U64 in);
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MEM_STATIC size_t MEM_swapST(size_t in);
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/*-**************************************************************
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* Memory I/O Implementation
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*****************************************************************/
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/* MEM_FORCE_MEMORY_ACCESS : For accessing unaligned memory:
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* Method 0 : always use `memcpy()`. Safe and portable.
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* Method 1 : Use compiler extension to set unaligned access.
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* Method 2 : direct access. This method is portable but violate C standard.
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* It can generate buggy code on targets depending on alignment.
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* Default : method 1 if supported, else method 0
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*/
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#ifndef MEM_FORCE_MEMORY_ACCESS /* can be defined externally, on command line for example */
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# ifdef __GNUC__
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# define MEM_FORCE_MEMORY_ACCESS 1
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# endif
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#endif
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MEM_STATIC unsigned MEM_32bits(void) { return sizeof(size_t)==4; }
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MEM_STATIC unsigned MEM_64bits(void) { return sizeof(size_t)==8; }
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MEM_STATIC unsigned MEM_isLittleEndian(void)
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{
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#if defined(__BYTE_ORDER__) && defined(__ORDER_LITTLE_ENDIAN__) && (__BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__)
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return 1;
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#elif defined(__BYTE_ORDER__) && defined(__ORDER_BIG_ENDIAN__) && (__BYTE_ORDER__ == __ORDER_BIG_ENDIAN__)
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return 0;
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#elif defined(__clang__) && __LITTLE_ENDIAN__
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return 1;
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#elif defined(__clang__) && __BIG_ENDIAN__
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return 0;
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#elif defined(_MSC_VER) && (_M_AMD64 || _M_IX86)
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return 1;
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#elif defined(__DMC__) && defined(_M_IX86)
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return 1;
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#else
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const union { U32 u; BYTE c[4]; } one = { 1 }; /* don't use static : performance detrimental */
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return one.c[0];
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#endif
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}
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#if defined(MEM_FORCE_MEMORY_ACCESS) && (MEM_FORCE_MEMORY_ACCESS==2)
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/* violates C standard, by lying on structure alignment.
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Only use if no other choice to achieve best performance on target platform */
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MEM_STATIC U16 MEM_read16(const void* memPtr) { return *(const U16*) memPtr; }
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MEM_STATIC U32 MEM_read32(const void* memPtr) { return *(const U32*) memPtr; }
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MEM_STATIC U64 MEM_read64(const void* memPtr) { return *(const U64*) memPtr; }
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MEM_STATIC size_t MEM_readST(const void* memPtr) { return *(const size_t*) memPtr; }
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MEM_STATIC void MEM_write16(void* memPtr, U16 value) { *(U16*)memPtr = value; }
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MEM_STATIC void MEM_write32(void* memPtr, U32 value) { *(U32*)memPtr = value; }
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MEM_STATIC void MEM_write64(void* memPtr, U64 value) { *(U64*)memPtr = value; }
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#elif defined(MEM_FORCE_MEMORY_ACCESS) && (MEM_FORCE_MEMORY_ACCESS==1)
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typedef __attribute__((aligned(1))) U16 unalign16;
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typedef __attribute__((aligned(1))) U32 unalign32;
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typedef __attribute__((aligned(1))) U64 unalign64;
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typedef __attribute__((aligned(1))) size_t unalignArch;
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MEM_STATIC U16 MEM_read16(const void* ptr) { return *(const unalign16*)ptr; }
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MEM_STATIC U32 MEM_read32(const void* ptr) { return *(const unalign32*)ptr; }
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MEM_STATIC U64 MEM_read64(const void* ptr) { return *(const unalign64*)ptr; }
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MEM_STATIC size_t MEM_readST(const void* ptr) { return *(const unalignArch*)ptr; }
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MEM_STATIC void MEM_write16(void* memPtr, U16 value) { *(unalign16*)memPtr = value; }
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MEM_STATIC void MEM_write32(void* memPtr, U32 value) { *(unalign32*)memPtr = value; }
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MEM_STATIC void MEM_write64(void* memPtr, U64 value) { *(unalign64*)memPtr = value; }
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#else
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/* default method, safe and standard.
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can sometimes prove slower */
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MEM_STATIC U16 MEM_read16(const void* memPtr)
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{
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U16 val; ZSTD_memcpy(&val, memPtr, sizeof(val)); return val;
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}
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MEM_STATIC U32 MEM_read32(const void* memPtr)
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{
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U32 val; ZSTD_memcpy(&val, memPtr, sizeof(val)); return val;
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}
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MEM_STATIC U64 MEM_read64(const void* memPtr)
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{
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U64 val; ZSTD_memcpy(&val, memPtr, sizeof(val)); return val;
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}
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MEM_STATIC size_t MEM_readST(const void* memPtr)
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{
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size_t val; ZSTD_memcpy(&val, memPtr, sizeof(val)); return val;
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}
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MEM_STATIC void MEM_write16(void* memPtr, U16 value)
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{
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ZSTD_memcpy(memPtr, &value, sizeof(value));
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}
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MEM_STATIC void MEM_write32(void* memPtr, U32 value)
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{
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ZSTD_memcpy(memPtr, &value, sizeof(value));
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}
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MEM_STATIC void MEM_write64(void* memPtr, U64 value)
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{
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ZSTD_memcpy(memPtr, &value, sizeof(value));
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}
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#endif /* MEM_FORCE_MEMORY_ACCESS */
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MEM_STATIC U32 MEM_swap32_fallback(U32 in)
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{
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return ((in << 24) & 0xff000000 ) |
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((in << 8) & 0x00ff0000 ) |
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((in >> 8) & 0x0000ff00 ) |
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((in >> 24) & 0x000000ff );
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}
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MEM_STATIC U32 MEM_swap32(U32 in)
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{
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#if defined(_MSC_VER) /* Visual Studio */
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return _byteswap_ulong(in);
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#elif (defined (__GNUC__) && (__GNUC__ * 100 + __GNUC_MINOR__ >= 403)) \
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|| (defined(__clang__) && __has_builtin(__builtin_bswap32))
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return __builtin_bswap32(in);
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#else
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return MEM_swap32_fallback(in);
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#endif
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}
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MEM_STATIC U64 MEM_swap64_fallback(U64 in)
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{
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return ((in << 56) & 0xff00000000000000ULL) |
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((in << 40) & 0x00ff000000000000ULL) |
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((in << 24) & 0x0000ff0000000000ULL) |
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((in << 8) & 0x000000ff00000000ULL) |
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((in >> 8) & 0x00000000ff000000ULL) |
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((in >> 24) & 0x0000000000ff0000ULL) |
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((in >> 40) & 0x000000000000ff00ULL) |
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((in >> 56) & 0x00000000000000ffULL);
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}
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MEM_STATIC U64 MEM_swap64(U64 in)
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{
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#if defined(_MSC_VER) /* Visual Studio */
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return _byteswap_uint64(in);
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#elif (defined (__GNUC__) && (__GNUC__ * 100 + __GNUC_MINOR__ >= 403)) \
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|| (defined(__clang__) && __has_builtin(__builtin_bswap64))
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return __builtin_bswap64(in);
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#else
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return MEM_swap64_fallback(in);
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#endif
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}
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MEM_STATIC size_t MEM_swapST(size_t in)
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{
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if (MEM_32bits())
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return (size_t)MEM_swap32((U32)in);
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else
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return (size_t)MEM_swap64((U64)in);
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}
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/*=== Little endian r/w ===*/
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MEM_STATIC U16 MEM_readLE16(const void* memPtr)
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{
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if (MEM_isLittleEndian())
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return MEM_read16(memPtr);
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else {
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const BYTE* p = (const BYTE*)memPtr;
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return (U16)(p[0] + (p[1]<<8));
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}
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}
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MEM_STATIC void MEM_writeLE16(void* memPtr, U16 val)
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{
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if (MEM_isLittleEndian()) {
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MEM_write16(memPtr, val);
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} else {
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BYTE* p = (BYTE*)memPtr;
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p[0] = (BYTE)val;
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p[1] = (BYTE)(val>>8);
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}
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}
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MEM_STATIC U32 MEM_readLE24(const void* memPtr)
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{
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return (U32)MEM_readLE16(memPtr) + ((U32)(((const BYTE*)memPtr)[2]) << 16);
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}
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MEM_STATIC void MEM_writeLE24(void* memPtr, U32 val)
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{
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MEM_writeLE16(memPtr, (U16)val);
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((BYTE*)memPtr)[2] = (BYTE)(val>>16);
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}
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MEM_STATIC U32 MEM_readLE32(const void* memPtr)
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{
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if (MEM_isLittleEndian())
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return MEM_read32(memPtr);
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else
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return MEM_swap32(MEM_read32(memPtr));
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}
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MEM_STATIC void MEM_writeLE32(void* memPtr, U32 val32)
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{
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if (MEM_isLittleEndian())
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MEM_write32(memPtr, val32);
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else
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MEM_write32(memPtr, MEM_swap32(val32));
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}
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MEM_STATIC U64 MEM_readLE64(const void* memPtr)
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{
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if (MEM_isLittleEndian())
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return MEM_read64(memPtr);
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else
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return MEM_swap64(MEM_read64(memPtr));
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}
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MEM_STATIC void MEM_writeLE64(void* memPtr, U64 val64)
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{
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if (MEM_isLittleEndian())
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MEM_write64(memPtr, val64);
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else
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MEM_write64(memPtr, MEM_swap64(val64));
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}
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MEM_STATIC size_t MEM_readLEST(const void* memPtr)
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{
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if (MEM_32bits())
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return (size_t)MEM_readLE32(memPtr);
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else
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return (size_t)MEM_readLE64(memPtr);
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}
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MEM_STATIC void MEM_writeLEST(void* memPtr, size_t val)
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{
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if (MEM_32bits())
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MEM_writeLE32(memPtr, (U32)val);
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else
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MEM_writeLE64(memPtr, (U64)val);
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}
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/*=== Big endian r/w ===*/
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MEM_STATIC U32 MEM_readBE32(const void* memPtr)
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{
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if (MEM_isLittleEndian())
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return MEM_swap32(MEM_read32(memPtr));
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else
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return MEM_read32(memPtr);
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}
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MEM_STATIC void MEM_writeBE32(void* memPtr, U32 val32)
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{
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if (MEM_isLittleEndian())
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MEM_write32(memPtr, MEM_swap32(val32));
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else
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MEM_write32(memPtr, val32);
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}
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MEM_STATIC U64 MEM_readBE64(const void* memPtr)
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{
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if (MEM_isLittleEndian())
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return MEM_swap64(MEM_read64(memPtr));
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else
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return MEM_read64(memPtr);
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}
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MEM_STATIC void MEM_writeBE64(void* memPtr, U64 val64)
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{
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if (MEM_isLittleEndian())
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MEM_write64(memPtr, MEM_swap64(val64));
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else
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MEM_write64(memPtr, val64);
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}
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MEM_STATIC size_t MEM_readBEST(const void* memPtr)
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{
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if (MEM_32bits())
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return (size_t)MEM_readBE32(memPtr);
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else
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return (size_t)MEM_readBE64(memPtr);
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}
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MEM_STATIC void MEM_writeBEST(void* memPtr, size_t val)
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{
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if (MEM_32bits())
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MEM_writeBE32(memPtr, (U32)val);
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else
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MEM_writeBE64(memPtr, (U64)val);
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}
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/* code only tested on 32 and 64 bits systems */
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MEM_STATIC void MEM_check(void) { DEBUG_STATIC_ASSERT((sizeof(size_t)==4) || (sizeof(size_t)==8)); }
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#if defined (__cplusplus)
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}
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#endif
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#endif /* MEM_H_MODULE */
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