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139 lines
3.9 KiB
C
139 lines
3.9 KiB
C
// Copyright (c) 2017-2019, The Monero Project
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//
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without modification, are
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// permitted provided that the following conditions are met:
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//
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// 1. Redistributions of source code must retain the above copyright notice, this list of
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// conditions and the following disclaimer.
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//
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// 2. Redistributions in binary form must reproduce the above copyright notice, this list
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// of conditions and the following disclaimer in the documentation and/or other
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// materials provided with the distribution.
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//
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// 3. Neither the name of the copyright holder nor the names of its contributors may be
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// used to endorse or promote products derived from this software without specific
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// prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
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// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
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// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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// PROCUREMENT OF 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 CONTRACT,
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// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
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// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <stdint.h>
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#include <string.h>
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#include "aligned.h"
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static inline int is_power_of_2(size_t n) { return n && (n & (n-1)) == 0; }
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#define MAGIC 0xaa0817161500ff81
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#define MAGIC_FREED 0xaa0817161500ff82
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static void local_abort(const char *msg)
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{
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fprintf(stderr, "%s\n", msg);
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#ifdef NDEBUG
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_exit(1);
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#else
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abort();
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#endif
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}
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typedef struct
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{
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uint64_t magic;
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void *raw;
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size_t bytes;
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size_t align;
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} control;
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void *aligned_malloc(size_t bytes, size_t align)
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{
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void *raw, *ptr;
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control *ctrl;
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if (!is_power_of_2(align))
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return NULL;
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if (bytes > (size_t)-1 - align)
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return NULL;
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if (bytes + align > (size_t)-1 - sizeof(control))
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return NULL;
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raw = malloc(bytes + sizeof(control) + align);
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if (!raw)
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return NULL;
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ptr = (void*)(((uintptr_t)raw + align + sizeof(control) - 1) & ~(align-1));
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ctrl = ((control*)ptr) - 1;
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ctrl->magic = MAGIC;
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ctrl->raw = raw;
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ctrl->bytes = bytes;
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ctrl->align = align;
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return ptr;
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}
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void *aligned_realloc(void *ptr, size_t bytes, size_t align)
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{
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void *raw, *ptr2;
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control *ctrl, *ctrl2;
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if (!ptr)
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return aligned_malloc(bytes, align);
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if (!bytes)
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{
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aligned_free(ptr);
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return NULL;
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}
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if (!is_power_of_2(align))
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return NULL;
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ctrl = ((control*)ptr) - 1;
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if (ctrl->magic == MAGIC_FREED)
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local_abort("Double free detected");
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if (ctrl->magic != MAGIC)
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local_abort("Freeing unallocated memory");
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if (ctrl->align != align)
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return NULL;
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if (ctrl->bytes >= bytes)
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return ptr;
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if (ctrl->bytes > (size_t)-1 - ctrl->align)
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return NULL;
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if (ctrl->bytes + ctrl->align > (size_t)-1 - sizeof(control))
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return NULL;
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raw = malloc(bytes + sizeof(control) + ctrl->align);
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if (!raw)
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return NULL;
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ptr2 = (void*)(((uintptr_t)raw + ctrl->align + sizeof(control) - 1) & ~(ctrl->align-1));
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memcpy(ptr2, ptr, ctrl->bytes);
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ctrl2 = ((control*)ptr2) - 1;
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ctrl2->magic = MAGIC;
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ctrl2->raw = raw;
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ctrl2->bytes = bytes;
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ctrl2->align = ctrl->align;
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ctrl->magic = MAGIC_FREED;
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free(ctrl->raw);
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return ptr2;
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}
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void aligned_free(void *ptr)
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{
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if (!ptr)
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return;
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control *ctrl = ((control*)ptr) - 1;
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if (ctrl->magic == MAGIC_FREED)
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local_abort("Double free detected");
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if (ctrl->magic != MAGIC)
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local_abort("Freeing unallocated memory");
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ctrl->magic = MAGIC_FREED;
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free(ctrl->raw);
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}
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