451 lines
14 KiB
C
451 lines
14 KiB
C
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/*
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* Copyright (c) 2016-2020, Yann Collet, Facebook, Inc.
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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 <string.h> /* 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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#if defined(__GNUC__)
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# define MEM_STATIC static __inline __attribute__((unused))
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#elif defined (__cplusplus) || (defined (__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) /* C99 */)
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# define MEM_STATIC static inline
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#elif defined(_MSC_VER)
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# define MEM_STATIC static __inline
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#else
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# define MEM_STATIC static /* this version may generate warnings for unused static functions; disable the relevant warning */
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#endif
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#ifndef __has_builtin
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# define __has_builtin(x) 0 /* compat. with non-clang compilers */
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#endif
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/* code only tested on 32 and 64 bits systems */
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#define MEM_STATIC_ASSERT(c) { enum { MEM_static_assert = 1/(int)(!!(c)) }; }
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MEM_STATIC void MEM_check(void) { MEM_STATIC_ASSERT((sizeof(size_t)==4) || (sizeof(size_t)==8)); }
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/* detects whether we are being compiled under msan */
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#if defined (__has_feature)
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# if __has_feature(memory_sanitizer)
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# define MEMORY_SANITIZER 1
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# endif
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#endif
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#if defined (MEMORY_SANITIZER)
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/* Not all platforms that support msan provide sanitizers/msan_interface.h.
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* We therefore declare the functions we need ourselves, rather than trying to
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* include the header file... */
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#include <stdint.h> /* intptr_t */
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/* Make memory region fully initialized (without changing its contents). */
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void __msan_unpoison(const volatile void *a, size_t size);
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/* Make memory region fully uninitialized (without changing its contents).
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This is a legacy interface that does not update origin information. Use
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__msan_allocated_memory() instead. */
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void __msan_poison(const volatile void *a, size_t size);
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/* Returns the offset of the first (at least partially) poisoned byte in the
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memory range, or -1 if the whole range is good. */
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intptr_t __msan_test_shadow(const volatile void *x, size_t size);
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#endif
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/* detects whether we are being compiled under asan */
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#if defined (ZFS_ASAN_ENABLED)
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# define ADDRESS_SANITIZER 1
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# define ZSTD_ASAN_DONT_POISON_WORKSPACE
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#endif
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#if defined (ADDRESS_SANITIZER)
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/* Not all platforms that support asan provide sanitizers/asan_interface.h.
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* We therefore declare the functions we need ourselves, rather than trying to
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* include the header file... */
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/**
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* Marks a memory region (<c>[addr, addr+size)</c>) as unaddressable.
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*
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* This memory must be previously allocated by your program. Instrumented
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* code is forbidden from accessing addresses in this region until it is
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* unpoisoned. This function is not guaranteed to poison the entire region -
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* it could poison only a subregion of <c>[addr, addr+size)</c> due to ASan
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* alignment restrictions.
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*
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* \note This function is not thread-safe because no two threads can poison or
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* unpoison memory in the same memory region simultaneously.
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*
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* \param addr Start of memory region.
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* \param size Size of memory region. */
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void __asan_poison_memory_region(void const volatile *addr, size_t size);
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/**
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* Marks a memory region (<c>[addr, addr+size)</c>) as addressable.
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*
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* This memory must be previously allocated by your program. Accessing
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* addresses in this region is allowed until this region is poisoned again.
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* This function could unpoison a super-region of <c>[addr, addr+size)</c> due
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* to ASan alignment restrictions.
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*
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* \note This function is not thread-safe because no two threads can
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* poison or unpoison memory in the same memory region simultaneously.
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*
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* \param addr Start of memory region.
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* \param size Size of memory region. */
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void __asan_unpoison_memory_region(void const volatile *addr, size_t size);
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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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# include <stdint.h>
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typedef uint8_t BYTE;
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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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#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
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*****************************************************************/
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/* MEM_FORCE_MEMORY_ACCESS :
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* By default, access to unaligned memory is controlled by `memcpy()`, which is safe and portable.
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* Unfortunately, on some target/compiler combinations, the generated assembly is sub-optimal.
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* The below switch allow to select different access method for improved performance.
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* Method 0 (default) : use `memcpy()`. Safe and portable.
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* Method 1 : `__packed` statement. It depends on compiler extension (i.e., not portable).
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* This method is safe if your compiler supports it, and *generally* as fast or faster than `memcpy`.
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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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* In some circumstances, it's the only known way to get the most performance (i.e. GCC + ARMv6)
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* See http://fastcompression.blogspot.fr/2015/08/accessing-unaligned-memory.html for details.
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* Prefer these methods in priority order (0 > 1 > 2)
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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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# if defined(__GNUC__) && ( defined(__ARM_ARCH_6__) || defined(__ARM_ARCH_6J__) || defined(__ARM_ARCH_6K__) || defined(__ARM_ARCH_6Z__) || defined(__ARM_ARCH_6ZK__) || defined(__ARM_ARCH_6T2__) )
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# define MEM_FORCE_MEMORY_ACCESS 2
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# elif defined(__INTEL_COMPILER) || defined(__GNUC__) || defined(__ICCARM__)
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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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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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}
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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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/* __pack instructions are safer, but compiler specific, hence potentially problematic for some compilers */
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/* currently only defined for gcc and icc */
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#if defined(_MSC_VER) || (defined(__INTEL_COMPILER) && defined(WIN32))
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__pragma( pack(push, 1) )
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typedef struct { U16 v; } unalign16;
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typedef struct { U32 v; } unalign32;
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typedef struct { U64 v; } unalign64;
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typedef struct { size_t v; } unalignArch;
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__pragma( pack(pop) )
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#else
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typedef struct { U16 v; } __attribute__((packed)) unalign16;
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typedef struct { U32 v; } __attribute__((packed)) unalign32;
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typedef struct { U64 v; } __attribute__((packed)) unalign64;
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typedef struct { size_t v; } __attribute__((packed)) unalignArch;
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#endif
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MEM_STATIC U16 MEM_read16(const void* ptr) { return ((const unalign16*)ptr)->v; }
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MEM_STATIC U32 MEM_read32(const void* ptr) { return ((const unalign32*)ptr)->v; }
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MEM_STATIC U64 MEM_read64(const void* ptr) { return ((const unalign64*)ptr)->v; }
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MEM_STATIC size_t MEM_readST(const void* ptr) { return ((const unalignArch*)ptr)->v; }
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MEM_STATIC void MEM_write16(void* memPtr, U16 value) { ((unalign16*)memPtr)->v = value; }
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MEM_STATIC void MEM_write32(void* memPtr, U32 value) { ((unalign32*)memPtr)->v = value; }
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MEM_STATIC void MEM_write64(void* memPtr, U64 value) { ((unalign64*)memPtr)->v = 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; 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; 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; 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; 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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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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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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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(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 ((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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#endif
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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 ((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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#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 MEM_readLE16(memPtr) + (((const BYTE*)memPtr)[2] << 16);
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}
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MEM_STATIC void MEM_writeLE24(void* memPtr, U32 val)
|
||
|
|
{
|
||
|
|
MEM_writeLE16(memPtr, (U16)val);
|
||
|
|
((BYTE*)memPtr)[2] = (BYTE)(val>>16);
|
||
|
|
}
|
||
|
|
|
||
|
|
MEM_STATIC U32 MEM_readLE32(const void* memPtr)
|
||
|
|
{
|
||
|
|
if (MEM_isLittleEndian())
|
||
|
|
return MEM_read32(memPtr);
|
||
|
|
else
|
||
|
|
return MEM_swap32(MEM_read32(memPtr));
|
||
|
|
}
|
||
|
|
|
||
|
|
MEM_STATIC void MEM_writeLE32(void* memPtr, U32 val32)
|
||
|
|
{
|
||
|
|
if (MEM_isLittleEndian())
|
||
|
|
MEM_write32(memPtr, val32);
|
||
|
|
else
|
||
|
|
MEM_write32(memPtr, MEM_swap32(val32));
|
||
|
|
}
|
||
|
|
|
||
|
|
MEM_STATIC U64 MEM_readLE64(const void* memPtr)
|
||
|
|
{
|
||
|
|
if (MEM_isLittleEndian())
|
||
|
|
return MEM_read64(memPtr);
|
||
|
|
else
|
||
|
|
return MEM_swap64(MEM_read64(memPtr));
|
||
|
|
}
|
||
|
|
|
||
|
|
MEM_STATIC void MEM_writeLE64(void* memPtr, U64 val64)
|
||
|
|
{
|
||
|
|
if (MEM_isLittleEndian())
|
||
|
|
MEM_write64(memPtr, val64);
|
||
|
|
else
|
||
|
|
MEM_write64(memPtr, MEM_swap64(val64));
|
||
|
|
}
|
||
|
|
|
||
|
|
MEM_STATIC size_t MEM_readLEST(const void* memPtr)
|
||
|
|
{
|
||
|
|
if (MEM_32bits())
|
||
|
|
return (size_t)MEM_readLE32(memPtr);
|
||
|
|
else
|
||
|
|
return (size_t)MEM_readLE64(memPtr);
|
||
|
|
}
|
||
|
|
|
||
|
|
MEM_STATIC void MEM_writeLEST(void* memPtr, size_t val)
|
||
|
|
{
|
||
|
|
if (MEM_32bits())
|
||
|
|
MEM_writeLE32(memPtr, (U32)val);
|
||
|
|
else
|
||
|
|
MEM_writeLE64(memPtr, (U64)val);
|
||
|
|
}
|
||
|
|
|
||
|
|
/*=== Big endian r/w ===*/
|
||
|
|
|
||
|
|
MEM_STATIC U32 MEM_readBE32(const void* memPtr)
|
||
|
|
{
|
||
|
|
if (MEM_isLittleEndian())
|
||
|
|
return MEM_swap32(MEM_read32(memPtr));
|
||
|
|
else
|
||
|
|
return MEM_read32(memPtr);
|
||
|
|
}
|
||
|
|
|
||
|
|
MEM_STATIC void MEM_writeBE32(void* memPtr, U32 val32)
|
||
|
|
{
|
||
|
|
if (MEM_isLittleEndian())
|
||
|
|
MEM_write32(memPtr, MEM_swap32(val32));
|
||
|
|
else
|
||
|
|
MEM_write32(memPtr, val32);
|
||
|
|
}
|
||
|
|
|
||
|
|
MEM_STATIC U64 MEM_readBE64(const void* memPtr)
|
||
|
|
{
|
||
|
|
if (MEM_isLittleEndian())
|
||
|
|
return MEM_swap64(MEM_read64(memPtr));
|
||
|
|
else
|
||
|
|
return MEM_read64(memPtr);
|
||
|
|
}
|
||
|
|
|
||
|
|
MEM_STATIC void MEM_writeBE64(void* memPtr, U64 val64)
|
||
|
|
{
|
||
|
|
if (MEM_isLittleEndian())
|
||
|
|
MEM_write64(memPtr, MEM_swap64(val64));
|
||
|
|
else
|
||
|
|
MEM_write64(memPtr, val64);
|
||
|
|
}
|
||
|
|
|
||
|
|
MEM_STATIC size_t MEM_readBEST(const void* memPtr)
|
||
|
|
{
|
||
|
|
if (MEM_32bits())
|
||
|
|
return (size_t)MEM_readBE32(memPtr);
|
||
|
|
else
|
||
|
|
return (size_t)MEM_readBE64(memPtr);
|
||
|
|
}
|
||
|
|
|
||
|
|
MEM_STATIC void MEM_writeBEST(void* memPtr, size_t val)
|
||
|
|
{
|
||
|
|
if (MEM_32bits())
|
||
|
|
MEM_writeBE32(memPtr, (U32)val);
|
||
|
|
else
|
||
|
|
MEM_writeBE64(memPtr, (U64)val);
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
#if defined (__cplusplus)
|
||
|
|
}
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#endif /* MEM_H_MODULE */
|