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#include "config.h"
#include "almalloc.h"
#include <stdlib.h>
#include <string.h>
#ifdef HAVE_MALLOC_H
#include <malloc.h>
#endif
#ifdef HAVE_WINDOWS_H
#include <windows.h>
#else
#include <unistd.h>
#endif
#ifdef __GNUC__
#define LIKELY(x) __builtin_expect(!!(x), !0)
#define UNLIKELY(x) __builtin_expect(!!(x), 0)
#else
#define LIKELY(x) (!!(x))
#define UNLIKELY(x) (!!(x))
#endif
void *al_malloc(size_t alignment, size_t size)
{
#if defined(HAVE_ALIGNED_ALLOC)
size = (size+(alignment-1))&~(alignment-1);
return aligned_alloc(alignment, size);
#elif defined(HAVE_POSIX_MEMALIGN)
void *ret;
if(posix_memalign(&ret, alignment, size) == 0)
return ret;
return nullptr;
#elif defined(HAVE__ALIGNED_MALLOC)
return _aligned_malloc(size, alignment);
#else
char *ret = static_cast<char*>(malloc(size+alignment));
if(ret != nullptr)
{
*(ret++) = 0x00;
while(((ptrdiff_t)ret&(alignment-1)) != 0)
*(ret++) = 0x55;
}
return ret;
#endif
}
void *al_calloc(size_t alignment, size_t size)
{
void *ret = al_malloc(alignment, size);
if(ret) memset(ret, 0, size);
return ret;
}
void al_free(void *ptr) noexcept
{
#if defined(HAVE_ALIGNED_ALLOC) || defined(HAVE_POSIX_MEMALIGN)
free(ptr);
#elif defined(HAVE__ALIGNED_MALLOC)
_aligned_free(ptr);
#else
if(ptr != nullptr)
{
char *finder = static_cast<char*>(ptr);
do {
--finder;
} while(*finder == 0x55);
free(finder);
}
#endif
}
size_t al_get_page_size(void) noexcept
{
static size_t psize = 0;
if(UNLIKELY(!psize))
{
#ifdef HAVE_SYSCONF
#if defined(_SC_PAGESIZE)
if(!psize) psize = sysconf(_SC_PAGESIZE);
#elif defined(_SC_PAGE_SIZE)
if(!psize) psize = sysconf(_SC_PAGE_SIZE);
#endif
#endif /* HAVE_SYSCONF */
#ifdef _WIN32
if(!psize)
{
SYSTEM_INFO sysinfo{};
GetSystemInfo(&sysinfo);
psize = sysinfo.dwPageSize;
}
#endif
if(!psize) psize = DEF_ALIGN;
}
return psize;
}
int al_is_sane_alignment_allocator(void) noexcept
{
#if defined(HAVE_ALIGNED_ALLOC) || defined(HAVE_POSIX_MEMALIGN) || defined(HAVE__ALIGNED_MALLOC)
return 1;
#else
return 0;
#endif
}
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