mirror of
https://github.com/VectorCamp/vectorscan.git
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135 lines
4.3 KiB
C++
135 lines
4.3 KiB
C++
/*
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* Copyright (c) 2015, Intel Corporation
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* * Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* * Neither the name of Intel Corporation nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/** \file
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* \brief Aligned memory alloc/free.
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*/
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#include "ue2common.h"
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#include "alloc.h"
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#include <cstdlib>
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#include <cstring>
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namespace ue2 {
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// This is one of the simplest ways to catch failure where we aren't using an
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// aligned_(zmalloc|_free) pair - it will force death if the wrong free is used.
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// We use this whenever assertions are switched on.
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#if !defined(NDEBUG)
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#define HACK_OFFSET 64
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#else
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#define HACK_OFFSET 0
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#endif
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/* get us a posix_memalign from somewhere */
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#if defined(__MINGW32__) || defined(__MINGW64__)
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#include <stdlib.h>
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#include <intrin.h>
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#include <malloc.h>
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#include <windows.h>
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#define posix_memalign(A, B, C) ((*A = (void *)__mingw_aligned_malloc(C, B)) == nullptr)
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#elif !defined(HAVE_POSIX_MEMALIGN)
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# if defined(HAVE_MEMALIGN)
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#define posix_memalign(A, B, C) ((*A = (void *)memalign(B, C)) == nullptr)
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# elif defined(HAVE__ALIGNED_MALLOC)
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/* on Windows */
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#include <malloc.h>
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#define posix_memalign(A, B, C) ((*A = (void *)_aligned_malloc(C, B)) == nullptr)
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# else
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#error no posix_memalign or memalign aligned malloc
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# endif
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#endif
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void *aligned_malloc_internal(size_t size, size_t align) {
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// cppcheck-suppress cstyleCast
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void *mem= nullptr;;
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int rv = posix_memalign(&mem, align, size);
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if (rv != 0) {
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DEBUG_PRINTF("posix_memalign returned %d when asked for %zu bytes\n",
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rv, size);
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return nullptr;
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}
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assert(mem);
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return mem;
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}
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void aligned_free_internal(void *ptr) {
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if (!ptr) {
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return;
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}
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#if defined(__MINGW32__) || defined(__MINGW64__)
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__mingw_aligned_free(ptr);
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#else
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free(ptr);
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#endif
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}
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/** \brief 64-byte aligned, zeroed malloc.
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*
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* Pointers should be freed with \ref aligned_free. If we are unable to
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* allocate the requested number of bytes, this function will throw
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* std::bad_alloc. */
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void *aligned_zmalloc(size_t size) {
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// Really huge allocations are probably an indication that we've
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// done something wrong.
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assert(size < 1024 * 1024 * 1024); // 1GB
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const size_t alloc_size = size + HACK_OFFSET;
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char *mem = static_cast<char *>(aligned_malloc_internal(alloc_size, 64));
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if (!mem) {
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DEBUG_PRINTF("unable to allocate %zu bytes\n", alloc_size);
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throw std::bad_alloc();
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}
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DEBUG_PRINTF("alloced %p reporting %p\n", mem, mem + HACK_OFFSET);
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assert(ISALIGNED_N(mem, 64));
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memset(mem, 0, alloc_size);
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return reinterpret_cast<void *>(mem + HACK_OFFSET);
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}
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/** \brief Free a pointer allocated with \ref aligned_zmalloc. */
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void aligned_free(void *ptr) {
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if (!ptr) {
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return;
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}
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ptrdiff_t *addr = static_cast<ptrdiff_t *>(ptr) - HACK_OFFSET;
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DEBUG_PRINTF("asked to free %p freeing %p\n", ptr, addr);
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assert(ISALIGNED_N(addr, 64));
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aligned_free_internal(addr);
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}
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} // namespace ue2
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