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/*
* Copyright (c) 2015, Intel Corporation
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of Intel Corporation nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/** \file
* \brief Aligned memory alloc/free.
*/
#include "ue2common.h"
#include "alloc.h"
#include <cstdlib>
#include <cstring>
namespace ue2 {
// This is one of the simplest ways to catch failure where we aren't using an
// aligned_(zmalloc|_free) pair - it will force death if the wrong free is used.
// We use this whenever assertions are switched on.
#if !defined(NDEBUG)
#define HACK_OFFSET 64
#else
#define HACK_OFFSET 0
#endif
/* get us a posix_memalign from somewhere */
#if !defined(HAVE_POSIX_MEMALIGN)
# if defined(HAVE_MEMALIGN)
#define posix_memalign(A, B, C) ((*A = (void *)memalign(B, C)) == nullptr)
# elif defined(HAVE__ALIGNED_MALLOC)
/* on Windows */
#include <malloc.h>
#define posix_memalign(A, B, C) ((*A = (void *)_aligned_malloc(C, B)) == nullptr)
# else
#error no posix_memalign or memalign aligned malloc
# endif
#endif
void *aligned_malloc_internal(size_t size, size_t align) {
void *mem;
#if !defined(_WIN32)
int rv = posix_memalign(&mem, align, size);
if (rv != 0) {
DEBUG_PRINTF("posix_memalign returned %d when asked for %zu bytes\n",
rv, size);
return nullptr;
}
#else
if (nullptr == (mem = _aligned_malloc(size, align))) {
DEBUG_PRINTF("_aligned_malloc failed when asked for %zu bytes\n",
size);
return nullptr;
}
#endif
assert(mem);
return mem;
}
void aligned_free_internal(void *ptr) {
if (!ptr) {
return;
}
#if defined(_WIN32)
_aligned_free(ptr);
#else
free(ptr);
#endif
}
/** \brief 64-byte aligned, zeroed malloc.
*
* Pointers should be freed with \ref aligned_free. If we are unable to
* allocate the requested number of bytes, this function will throw
* std::bad_alloc. */
void *aligned_zmalloc(size_t size) {
// Really huge allocations are probably an indication that we've
// done something wrong.
assert(size < 1024 * 1024 * 1024); // 1GB
const size_t alloc_size = size + HACK_OFFSET;
void *mem = aligned_malloc_internal(alloc_size, 64);
if (!mem) {
DEBUG_PRINTF("unable to allocate %zu bytes\n", alloc_size);
throw std::bad_alloc();
}
DEBUG_PRINTF("alloced %p reporting %p\n", mem, (char *)mem + HACK_OFFSET);
assert(ISALIGNED_N(mem, 64));
memset(mem, 0, alloc_size);
return (void *)((char *)mem + HACK_OFFSET);
}
/** \brief Free a pointer allocated with \ref aligned_zmalloc. */
void aligned_free(void *ptr) {
if (!ptr) {
return;
}
void *addr = (void *)((char *)ptr - HACK_OFFSET);
DEBUG_PRINTF("asked to free %p freeing %p\n", ptr, addr);
assert(ISALIGNED_N(addr, 64));
aligned_free_internal(addr);
}
} // namespace ue2
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