153 lines
4.1 KiB
C
153 lines
4.1 KiB
C
/* alloc.c -- Memory allocation without mmap.
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Copyright (C) 2012-2015 Free Software Foundation, Inc.
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Written by Ian Lance Taylor, Google.
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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
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met:
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(1) Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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(2) Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in
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the documentation and/or other materials provided with the
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distribution.
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(3) The name of the author may not be used to
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endorse or promote products derived from this software without
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specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
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INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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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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#include "config.h"
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#include <errno.h>
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#include <stdlib.h>
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#include <sys/types.h>
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#include "backtrace.h"
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#include "internal.h"
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/* Allocation routines to use on systems that do not support anonymous
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mmap. This implementation just uses malloc, which means that the
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backtrace functions may not be safely invoked from a signal
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handler. */
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/* Allocate memory like malloc. */
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void *
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backtrace_alloc (struct backtrace_state *state ATTRIBUTE_UNUSED,
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size_t size, backtrace_error_callback error_callback,
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void *data)
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{
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void *ret;
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ret = malloc (size);
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if (ret == NULL)
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error_callback (data, "malloc", errno);
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return ret;
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}
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/* Free memory. */
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void
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backtrace_free (struct backtrace_state *state ATTRIBUTE_UNUSED,
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void *p, size_t size ATTRIBUTE_UNUSED,
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backtrace_error_callback error_callback ATTRIBUTE_UNUSED,
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void *data ATTRIBUTE_UNUSED)
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{
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free (p);
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}
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/* Grow VEC by SIZE bytes. */
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void *
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backtrace_vector_grow (struct backtrace_state *state ATTRIBUTE_UNUSED,
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size_t size, backtrace_error_callback error_callback,
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void *data, struct backtrace_vector *vec)
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{
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void *ret;
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if (size > vec->alc)
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{
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size_t alc;
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void *base;
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if (vec->size == 0)
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alc = 32 * size;
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else if (vec->size >= 4096)
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alc = vec->size + 4096;
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else
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alc = 2 * vec->size;
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if (alc < vec->size + size)
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alc = vec->size + size;
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base = realloc (vec->base, alc);
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if (base == NULL)
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{
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error_callback (data, "realloc", errno);
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return NULL;
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}
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vec->base = base;
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vec->alc = alc - vec->size;
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}
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ret = (char *) vec->base + vec->size;
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vec->size += size;
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vec->alc -= size;
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return ret;
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}
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/* Finish the current allocation on VEC. */
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void *
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backtrace_vector_finish (struct backtrace_state *state,
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struct backtrace_vector *vec,
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backtrace_error_callback error_callback,
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void *data)
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{
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void *ret;
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/* With this allocator we call realloc in backtrace_vector_grow,
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which means we can't easily reuse the memory here. So just
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release it. */
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if (!backtrace_vector_release (state, vec, error_callback, data))
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return NULL;
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ret = vec->base;
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vec->base = NULL;
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vec->size = 0;
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vec->alc = 0;
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return ret;
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}
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/* Release any extra space allocated for VEC. */
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int
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backtrace_vector_release (struct backtrace_state *state ATTRIBUTE_UNUSED,
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struct backtrace_vector *vec,
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backtrace_error_callback error_callback,
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void *data)
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{
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vec->base = realloc (vec->base, vec->size);
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if (vec->base == NULL)
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{
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error_callback (data, "realloc", errno);
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return 0;
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}
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vec->alc = 0;
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return 1;
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}
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