141 lines
3.8 KiB
C
141 lines
3.8 KiB
C
/* alloc.c -- Memory allocation without mmap.
|
|
Copyright (C) 2012-2013 Free Software Foundation, Inc.
|
|
Written by Ian Lance Taylor, Google.
|
|
|
|
Redistribution and use in source and binary forms, with or without
|
|
modification, are permitted provided that the following conditions are
|
|
met:
|
|
|
|
(1) Redistributions of source code must retain the above copyright
|
|
notice, this list of conditions and the following disclaimer.
|
|
|
|
(2) 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.
|
|
|
|
(3) The name of the author may not be used to
|
|
endorse or promote products derived from this software without
|
|
specific prior written permission.
|
|
|
|
THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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. */
|
|
|
|
#include "config.h"
|
|
|
|
#include <errno.h>
|
|
#include <stdlib.h>
|
|
#include <sys/types.h>
|
|
|
|
#include "backtrace.h"
|
|
#include "internal.h"
|
|
|
|
/* Allocation routines to use on systems that do not support anonymous
|
|
mmap. This implementation just uses malloc, which means that the
|
|
backtrace functions may not be safely invoked from a signal
|
|
handler. */
|
|
|
|
/* Allocate memory like malloc. */
|
|
|
|
void *
|
|
backtrace_alloc (struct backtrace_state *state ATTRIBUTE_UNUSED,
|
|
size_t size, backtrace_error_callback error_callback,
|
|
void *data)
|
|
{
|
|
void *ret;
|
|
|
|
ret = malloc (size);
|
|
if (ret == NULL)
|
|
error_callback (data, "malloc", errno);
|
|
return ret;
|
|
}
|
|
|
|
/* Free memory. */
|
|
|
|
void
|
|
backtrace_free (struct backtrace_state *state ATTRIBUTE_UNUSED,
|
|
void *p, size_t size ATTRIBUTE_UNUSED,
|
|
backtrace_error_callback error_callback ATTRIBUTE_UNUSED,
|
|
void *data ATTRIBUTE_UNUSED)
|
|
{
|
|
free (p);
|
|
}
|
|
|
|
/* Grow VEC by SIZE bytes. */
|
|
|
|
void *
|
|
backtrace_vector_grow (struct backtrace_state *state ATTRIBUTE_UNUSED,
|
|
size_t size, backtrace_error_callback error_callback,
|
|
void *data, struct backtrace_vector *vec)
|
|
{
|
|
void *ret;
|
|
|
|
if (size > vec->alc)
|
|
{
|
|
size_t alc;
|
|
void *base;
|
|
|
|
if (vec->size == 0)
|
|
alc = 32 * size;
|
|
else if (vec->size >= 4096)
|
|
alc = vec->size + 4096;
|
|
else
|
|
alc = 2 * vec->size;
|
|
|
|
if (alc < vec->size + size)
|
|
alc = vec->size + size;
|
|
|
|
base = realloc (vec->base, alc);
|
|
if (base == NULL)
|
|
{
|
|
error_callback (data, "realloc", errno);
|
|
return NULL;
|
|
}
|
|
|
|
vec->base = base;
|
|
vec->alc = alc - vec->size;
|
|
}
|
|
|
|
ret = (char *) vec->base + vec->size;
|
|
vec->size += size;
|
|
vec->alc -= size;
|
|
return ret;
|
|
}
|
|
|
|
/* Finish the current allocation on VEC. */
|
|
|
|
void
|
|
backtrace_vector_finish (struct backtrace_state *state ATTRIBUTE_UNUSED,
|
|
struct backtrace_vector *vec)
|
|
{
|
|
vec->base = (char *) vec->base + vec->size;
|
|
vec->size = 0;
|
|
}
|
|
|
|
/* Release any extra space allocated for VEC. */
|
|
|
|
int
|
|
backtrace_vector_release (struct backtrace_state *state ATTRIBUTE_UNUSED,
|
|
struct backtrace_vector *vec,
|
|
backtrace_error_callback error_callback,
|
|
void *data)
|
|
{
|
|
vec->base = realloc (vec->base, vec->size);
|
|
if (vec->base == NULL)
|
|
{
|
|
error_callback (data, "realloc", errno);
|
|
return 0;
|
|
}
|
|
vec->alc = 0;
|
|
return 1;
|
|
}
|