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/*
* lib_common.h - internal header included by all library code
*/
#ifndef LIB_LIB_COMMON_H
#define LIB_LIB_COMMON_H
#ifdef LIBDEFLATE_H
/*
* When building the library, LIBDEFLATEAPI needs to be defined properly before
* including libdeflate.h.
*/
# error "lib_common.h must always be included before libdeflate.h"
#endif
#if defined(LIBDEFLATE_DLL) && (defined(_WIN32) || defined(__CYGWIN__))
# define LIBDEFLATE_EXPORT_SYM __declspec(dllexport)
#elif defined(__GNUC__)
# define LIBDEFLATE_EXPORT_SYM __attribute__((visibility("default")))
#else
# define LIBDEFLATE_EXPORT_SYM
#endif
/*
* On i386, gcc assumes that the stack is 16-byte aligned at function entry.
* However, some compilers (e.g. MSVC) and programming languages (e.g. Delphi)
* only guarantee 4-byte alignment when calling functions. This is mainly an
* issue on Windows, but it has been seen on Linux too. Work around this ABI
* incompatibility by realigning the stack pointer when entering libdeflate.
* This prevents crashes in SSE/AVX code.
*/
#if defined(__GNUC__) && defined(__i386__)
# define LIBDEFLATE_ALIGN_STACK __attribute__((force_align_arg_pointer))
#else
# define LIBDEFLATE_ALIGN_STACK
#endif
#define LIBDEFLATEAPI LIBDEFLATE_EXPORT_SYM LIBDEFLATE_ALIGN_STACK
#include "../common_defs.h"
typedef void *(*malloc_func_t)(size_t);
typedef void (*free_func_t)(void *);
extern malloc_func_t libdeflate_default_malloc_func;
extern free_func_t libdeflate_default_free_func;
void *libdeflate_aligned_malloc(malloc_func_t malloc_func,
size_t alignment, size_t size);
void libdeflate_aligned_free(free_func_t free_func, void *ptr);
#ifdef FREESTANDING
/*
* With -ffreestanding, <string.h> may be missing, and we must provide
* implementations of memset(), memcpy(), memmove(), and memcmp().
* See https://gcc.gnu.org/onlinedocs/gcc/Standards.html
*
* Also, -ffreestanding disables interpreting calls to these functions as
* built-ins. E.g., calling memcpy(&v, p, WORDBYTES) will make a function call,
* not be optimized to a single load instruction. For performance reasons we
* don't want that. So, declare these functions as macros that expand to the
* corresponding built-ins. This approach is recommended in the gcc man page.
* We still need the actual function definitions in case gcc calls them.
*/
void *memset(void *s, int c, size_t n);
#define memset(s, c, n) __builtin_memset((s), (c), (n))
void *memcpy(void *dest, const void *src, size_t n);
#define memcpy(dest, src, n) __builtin_memcpy((dest), (src), (n))
void *memmove(void *dest, const void *src, size_t n);
#define memmove(dest, src, n) __builtin_memmove((dest), (src), (n))
int memcmp(const void *s1, const void *s2, size_t n);
#define memcmp(s1, s2, n) __builtin_memcmp((s1), (s2), (n))
#undef LIBDEFLATE_ENABLE_ASSERTIONS
#else
# include <string.h>
/*
* To prevent false positive static analyzer warnings, ensure that assertions
* are visible to the static analyzer.
*/
# ifdef __clang_analyzer__
# define LIBDEFLATE_ENABLE_ASSERTIONS
# endif
#endif
/*
* Runtime assertion support. Don't enable this in production builds; it may
* hurt performance significantly.
*/
#ifdef LIBDEFLATE_ENABLE_ASSERTIONS
NORETURN void
libdeflate_assertion_failed(const char *expr, const char *file, int line);
#define ASSERT(expr) { if (unlikely(!(expr))) \
libdeflate_assertion_failed(#expr, __FILE__, __LINE__); }
#else
#define ASSERT(expr) (void)(expr)
#endif
#define CONCAT_IMPL(a, b) a##b
#define CONCAT(a, b) CONCAT_IMPL(a, b)
#define ADD_SUFFIX(name) CONCAT(name, SUFFIX)
#endif /* LIB_LIB_COMMON_H */
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