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343 lines (309 loc) · 10.9 KB
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#ifndef _ZBUILD_H
#define _ZBUILD_H
#define _POSIX_SOURCE 1 /* fileno */
#ifndef _POSIX_C_SOURCE
# define _POSIX_C_SOURCE 200809L /* snprintf, posix_memalign, strdup */
#endif
#ifndef _ISOC11_SOURCE
# define _ISOC11_SOURCE 1 /* aligned_alloc */
#endif
#ifdef __OpenBSD__
# define _BSD_SOURCE 1
#endif
#include <stddef.h>
#include <string.h>
#include <stdlib.h>
#include <stdint.h>
/* Determine compiler version of C Standard */
#ifdef __STDC_VERSION__
# if __STDC_VERSION__ >= 199901L
# ifndef STDC99
# define STDC99
# endif
# endif
# if __STDC_VERSION__ >= 201112L
# ifndef STDC11
# define STDC11
# endif
# endif
#endif
#ifndef Z_HAS_ATTRIBUTE
# if defined(__has_attribute)
# define Z_HAS_ATTRIBUTE(a) __has_attribute(a)
# else
# define Z_HAS_ATTRIBUTE(a) 0
# endif
#endif
#ifndef Z_FALLTHROUGH
# if Z_HAS_ATTRIBUTE(__fallthrough__) || (defined(__GNUC__) && (__GNUC__ >= 7))
# define Z_FALLTHROUGH __attribute__((__fallthrough__))
# else
# define Z_FALLTHROUGH do {} while(0) /* fallthrough */
# endif
#endif
#ifndef Z_TARGET
# if Z_HAS_ATTRIBUTE(__target__)
# define Z_TARGET(x) __attribute__((__target__(x)))
# else
# define Z_TARGET(x)
# endif
#endif
/* This has to be first include that defines any types */
#if defined(_MSC_VER)
# if defined(_WIN64)
typedef __int64 ssize_t;
# else
typedef long ssize_t;
# endif
# if defined(_WIN64)
#define SSIZE_MAX _I64_MAX
# else
#define SSIZE_MAX LONG_MAX
# endif
#endif
/* MS Visual Studio does not allow inline in C, only C++.
But it provides __inline instead, so use that. */
#if defined(_MSC_VER) && !defined(inline) && !defined(__cplusplus)
# define inline __inline
#endif
#if defined(ZLIB_COMPAT)
# define PREFIX(x) x
# define PREFIX2(x) ZLIB_ ## x
# define PREFIX3(x) z_ ## x
# define PREFIX4(x) x ## 64
# define zVersion zlibVersion
#else
# define PREFIX(x) zng_ ## x
# define PREFIX2(x) ZLIBNG_ ## x
# define PREFIX3(x) zng_ ## x
# define PREFIX4(x) zng_ ## x
# define zVersion zlibng_version
# define z_size_t size_t
#endif
/* In zlib-compat some functions and types use unsigned long, but zlib-ng use size_t */
#if defined(ZLIB_COMPAT)
# define z_uintmax_t unsigned long
#else
# define z_uintmax_t size_t
#endif
/* Minimum of a and b. */
#define MIN(a, b) ((a) > (b) ? (b) : (a))
/* Maximum of a and b. */
#define MAX(a, b) ((a) < (b) ? (b) : (a))
/* Ignore unused variable warning */
#define Z_UNUSED(var) (void)(var)
#if defined(HAVE_VISIBILITY_INTERNAL)
# define Z_INTERNAL __attribute__((visibility ("internal")))
#elif defined(HAVE_VISIBILITY_HIDDEN)
# define Z_INTERNAL __attribute__((visibility ("hidden")))
#else
# define Z_INTERNAL
#endif
/* Symbol versioning helpers, allowing multiple versions of a function to exist.
* Functions using this must also be added to zlib-ng.map for each version.
* Double @@ means this is the default for newly compiled applications to link against.
* Single @ means this is kept for backwards compatibility.
* This is only used for Zlib-ng native API, and only on platforms supporting this.
*/
#if defined(HAVE_SYMVER)
# define ZSYMVER(func,alias,ver) __asm__(".symver " func ", " alias "@ZLIB_NG_" ver);
# define ZSYMVER_DEF(func,alias,ver) __asm__(".symver " func ", " alias "@@ZLIB_NG_" ver);
#else
# define ZSYMVER(func,alias,ver)
# define ZSYMVER_DEF(func,alias,ver)
#endif
#ifndef __cplusplus
# define Z_REGISTER register
#else
# define Z_REGISTER
#endif
/* Reverse the bytes in a value. Use compiler intrinsics when
possible to take advantage of hardware implementations. */
#if defined(_MSC_VER) && (_MSC_VER >= 1300)
# include <stdlib.h>
# pragma intrinsic(_byteswap_ulong)
# define ZSWAP16(q) _byteswap_ushort(q)
# define ZSWAP32(q) _byteswap_ulong(q)
# define ZSWAP64(q) _byteswap_uint64(q)
#elif defined(__clang__) || (defined(__GNUC__) && \
(__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 8)))
# define ZSWAP16(q) __builtin_bswap16(q)
# define ZSWAP32(q) __builtin_bswap32(q)
# define ZSWAP64(q) __builtin_bswap64(q)
#elif defined(__GNUC__) && (__GNUC__ >= 2) && defined(__linux__)
# include <byteswap.h>
# define ZSWAP16(q) bswap_16(q)
# define ZSWAP32(q) bswap_32(q)
# define ZSWAP64(q) bswap_64(q)
#elif defined(__FreeBSD__) || defined(__NetBSD__) || defined(__DragonFly__)
# include <sys/endian.h>
# define ZSWAP16(q) bswap16(q)
# define ZSWAP32(q) bswap32(q)
# define ZSWAP64(q) bswap64(q)
#elif defined(__OpenBSD__)
# include <sys/endian.h>
# define ZSWAP16(q) swap16(q)
# define ZSWAP32(q) swap32(q)
# define ZSWAP64(q) swap64(q)
#elif defined(__INTEL_COMPILER)
/* ICC does not provide a two byte swap. */
# define ZSWAP16(q) ((((q) & 0xff) << 8) | (((q) & 0xff00) >> 8))
# define ZSWAP32(q) _bswap(q)
# define ZSWAP64(q) _bswap64(q)
#else
# define ZSWAP16(q) ((((q) & 0xff) << 8) | (((q) & 0xff00) >> 8))
# define ZSWAP32(q) ((((q) >> 24) & 0xff) + (((q) >> 8) & 0xff00) + \
(((q) & 0xff00) << 8) + (((q) & 0xff) << 24))
# define ZSWAP64(q) \
(((q & 0xFF00000000000000u) >> 56u) | \
((q & 0x00FF000000000000u) >> 40u) | \
((q & 0x0000FF0000000000u) >> 24u) | \
((q & 0x000000FF00000000u) >> 8u) | \
((q & 0x00000000FF000000u) << 8u) | \
((q & 0x0000000000FF0000u) << 24u) | \
((q & 0x000000000000FF00u) << 40u) | \
((q & 0x00000000000000FFu) << 56u))
#endif
/* Only enable likely/unlikely if the compiler is known to support it */
#if (defined(__GNUC__) && (__GNUC__ >= 3)) || defined(__INTEL_COMPILER) || defined(__clang__)
# define LIKELY_NULL(x) __builtin_expect((x) != 0, 0)
# define LIKELY(x) __builtin_expect(!!(x), 1)
# define UNLIKELY(x) __builtin_expect(!!(x), 0)
#else
# define LIKELY_NULL(x) x
# define LIKELY(x) x
# define UNLIKELY(x) x
#endif /* (un)likely */
#if defined(HAVE_ATTRIBUTE_ALIGNED)
# define ALIGNED_(x) __attribute__ ((aligned(x)))
#elif defined(_MSC_VER)
# define ALIGNED_(x) __declspec(align(x))
#else
/* TODO: Define ALIGNED_ for your compiler */
# define ALIGNED_(x)
#endif
#ifdef HAVE_BUILTIN_ASSUME_ALIGNED
# define HINT_ALIGNED(p,n) __builtin_assume_aligned((void *)(p),(n))
#else
# define HINT_ALIGNED(p,n) (p)
#endif
#define HINT_ALIGNED_16(p) HINT_ALIGNED((p),16)
#define HINT_ALIGNED_64(p) HINT_ALIGNED((p),64)
#define HINT_ALIGNED_4096(p) HINT_ALIGNED((p),4096)
/* PADSZ returns needed bytes to pad bpos to pad size
* PAD_NN calculates pad size and adds it to bpos, returning the result.
* All take an integer or a pointer as bpos input.
*/
#define PADSZ(bpos, pad) (((pad) - ((uintptr_t)(bpos) % (pad))) % (pad))
#define PAD_16(bpos) ((bpos) + PADSZ((bpos),16))
#define PAD_64(bpos) ((bpos) + PADSZ((bpos),64))
#define PAD_4096(bpos) ((bpos) + PADSZ((bpos),4096))
/* Diagnostic functions */
#ifdef ZLIB_DEBUG
# include <stdio.h>
extern int Z_INTERNAL z_verbose;
extern void Z_INTERNAL z_error(const char *m);
# define Assert(cond, msg) {int _cond = (cond); if (!_cond) z_error(msg);}
# define Trace(x) {if (z_verbose >= 0) fprintf x;}
# define Tracev(x) {if (z_verbose > 0) fprintf x;}
# define Tracevv(x) {if (z_verbose > 1) fprintf x;}
# define Tracec(c, x) {if (z_verbose > 0 && (c)) fprintf x;}
# define Tracecv(c, x) {if (z_verbose > 1 && (c)) fprintf x;}
#else
# define Assert(cond, msg)
# define Trace(x)
# define Tracev(x)
# define Tracevv(x)
# define Tracec(c, x)
# define Tracecv(c, x)
#endif
/* OPTIMAL_CMP values determine the comparison width:
* 64: Best for 64-bit architectures with unaligned access
* 32: Best for 32-bit architectures with unaligned access
* 16: Safe default for unknown architectures
* 8: Safe fallback for architectures without unaligned access
* Note: The unaligned access mentioned is cpu-support, this allows compiler or
* separate unaligned intrinsics to utilize safe unaligned access, without
* utilizing unaligned C pointers that are known to have undefined behavior.
*/
#if !defined(OPTIMAL_CMP)
# if defined(__x86_64__) || defined(_M_X64) || defined(__amd64__) || defined(_M_AMD64)
# define OPTIMAL_CMP 64
# elif defined(__i386__) || defined(__i486__) || defined(__i586__) || \
defined(__i686__) || defined(_X86_) || defined(_M_IX86)
# define OPTIMAL_CMP 32
# elif defined(__aarch64__) || defined(_M_ARM64) || defined(_M_ARM64EC)
# if defined(__ARM_FEATURE_UNALIGNED) || defined(_WIN32)
# define OPTIMAL_CMP 64
# else
# define OPTIMAL_CMP 8
# endif
# elif defined(__arm__) || defined(_M_ARM)
# if defined(__ARM_FEATURE_UNALIGNED) || defined(_WIN32)
# define OPTIMAL_CMP 32
# else
# define OPTIMAL_CMP 8
# endif
# elif defined(__powerpc64__) || defined(__ppc64__)
# define OPTIMAL_CMP 64
# elif defined(__powerpc__) || defined(__ppc__) || defined(__PPC__)
# define OPTIMAL_CMP 32
# endif
#endif
#if !defined(OPTIMAL_CMP)
# define OPTIMAL_CMP 16
#endif
#if defined(__has_feature)
# if __has_feature(address_sanitizer)
# define Z_ADDRESS_SANITIZER 1
# endif
#elif defined(__SANITIZE_ADDRESS__)
# define Z_ADDRESS_SANITIZER 1
#endif
/*
* __asan_loadN() and __asan_storeN() calls are inserted by compilers in order to check memory accesses.
* They can be called manually too, with the following caveats:
* gcc says: "warning: implicit declaration of function '...'"
* g++ says: "error: new declaration '...' ambiguates built-in declaration '...'"
* Accommodate both.
*/
#ifdef Z_ADDRESS_SANITIZER
#ifndef __cplusplus
void __asan_loadN(void *, long);
void __asan_storeN(void *, long);
#endif
#else
# define __asan_loadN(a, size) do { Z_UNUSED(a); Z_UNUSED(size); } while (0)
# define __asan_storeN(a, size) do { Z_UNUSED(a); Z_UNUSED(size); } while (0)
#endif
#if defined(__has_feature)
# if __has_feature(memory_sanitizer)
# define Z_MEMORY_SANITIZER 1
# include <sanitizer/msan_interface.h>
# endif
#endif
#ifndef Z_MEMORY_SANITIZER
# define __msan_check_mem_is_initialized(a, size) do { Z_UNUSED(a); Z_UNUSED(size); } while (0)
# define __msan_unpoison(a, size) do { Z_UNUSED(a); Z_UNUSED(size); } while (0)
#endif
/* Notify sanitizer runtime about an upcoming read access. */
#define instrument_read(a, size) do { \
void *__a = (void *)(a); \
long __size = size; \
__asan_loadN(__a, __size); \
__msan_check_mem_is_initialized(__a, __size); \
} while (0)
/* Notify sanitizer runtime about an upcoming write access. */
#define instrument_write(a, size) do { \
void *__a = (void *)(a); \
long __size = size; \
__asan_storeN(__a, __size); \
} while (0)
/* Notify sanitizer runtime about an upcoming read/write access. */
#define instrument_read_write(a, size) do { \
void *__a = (void *)(a); \
long __size = size; \
__asan_storeN(__a, __size); \
__msan_check_mem_is_initialized(__a, __size); \
} while (0)
#endif