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/* wmem_allocator_simple.c
* Wireshark Memory Manager Simple Allocator
* Copyright 2012, Evan Huus <eapache@gmail.com>
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "config.h"
#include <string.h>
#include <glib.h>
#include "wmem_core.h"
#include "wmem_allocator.h"
#include "wmem_allocator_simple.h"
#define DEFAULT_ALLOCS 8192
typedef struct _wmem_simple_allocator_t {
int size;
int count;
void **ptrs;
} wmem_simple_allocator_t;
static void *
wmem_simple_alloc(void *private_data, const size_t size)
{
wmem_simple_allocator_t *allocator;
allocator = (wmem_simple_allocator_t*) private_data;
if G_UNLIKELY(allocator->count == allocator->size) {
allocator->size *= 2;
allocator->ptrs = (void**)wmem_realloc(NULL, allocator->ptrs,
sizeof(void*) * allocator->size);
}
return allocator->ptrs[allocator->count++] = wmem_alloc(NULL, size);
}
static void
wmem_simple_free(void *private_data, void *ptr)
{
int i;
wmem_simple_allocator_t *allocator;
allocator = (wmem_simple_allocator_t*) private_data;
wmem_free(NULL, ptr);
allocator->count--;
for (i=allocator->count; i>=0; i--) {
if (ptr == allocator->ptrs[i]) {
if (i < allocator->count) {
allocator->ptrs[i] = allocator->ptrs[allocator->count];
}
return;
}
}
g_assert_not_reached();
}
static void *
wmem_simple_realloc(void *private_data, void *ptr, const size_t size)
{
int i;
wmem_simple_allocator_t *allocator;
allocator = (wmem_simple_allocator_t*) private_data;
for (i=allocator->count-1; i>=0; i--) {
if (ptr == allocator->ptrs[i]) {
return allocator->ptrs[i] = wmem_realloc(NULL, allocator->ptrs[i], size);
}
}
g_assert_not_reached();
return NULL;
}
static void
wmem_simple_free_all(void *private_data)
{
wmem_simple_allocator_t *allocator;
int i;
allocator = (wmem_simple_allocator_t*) private_data;
for (i = 0; i<allocator->count; i++) {
wmem_free(NULL, allocator->ptrs[i]);
}
allocator->count = 0;
}
static void
wmem_simple_gc(void *private_data _U_)
{
/* In this simple allocator, there is nothing to garbage-collect */
}
static void
wmem_simple_allocator_cleanup(void *private_data)
{
wmem_simple_allocator_t *allocator;
allocator = (wmem_simple_allocator_t*) private_data;
wmem_free(NULL, allocator->ptrs);
wmem_free(NULL, allocator);
}
void
wmem_simple_allocator_init(wmem_allocator_t *allocator)
{
wmem_simple_allocator_t *simple_allocator;
simple_allocator = wmem_new(NULL, wmem_simple_allocator_t);
allocator->alloc = &wmem_simple_alloc;
allocator->realloc = &wmem_simple_realloc;
allocator->free = &wmem_simple_free;
allocator->free_all = &wmem_simple_free_all;
allocator->gc = &wmem_simple_gc;
allocator->cleanup = &wmem_simple_allocator_cleanup;
allocator->private_data = (void*) simple_allocator;
simple_allocator->count = 0;
simple_allocator->size = DEFAULT_ALLOCS;
simple_allocator->ptrs = wmem_alloc_array(NULL, void*, DEFAULT_ALLOCS);
}
/*
* Editor modelines - http://www.wireshark.org/tools/modelines.html
*
* Local variables:
* c-basic-offset: 4
* tab-width: 8
* indent-tabs-mode: nil
* End:
*
* vi: set shiftwidth=4 tabstop=8 expandtab:
* :indentSize=4:tabSize=8:noTabs=true:
*/
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