![Evan Huus](/assets/img/avatar_default.png)
a NULL allocator. This gives us a single, central place to handle out-of-memory errors (by, for example, throwing an exception) for basically all of epan. The only remaining glib memory that is directly allocated is for the hash tables used by the simple and strict allocators. svn path=/trunk/; revision=51627
162 lines
4.5 KiB
C
162 lines
4.5 KiB
C
/* wmem_allocator_simple.c
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* Wireshark Memory Manager Simple Allocator
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* Copyright 2012, Evan Huus <eapache@gmail.com>
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*
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* $Id$
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 1998 Gerald Combs
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "config.h"
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#include <string.h>
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#include <glib.h>
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#include "wmem_core.h"
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#include "wmem_allocator.h"
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/* In this trivial allocator, we just store a GHashTable of malloc()ed
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* blocks in the private_data pointer. We could just set the private_data
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* pointer directly to the GHashTable, but we use a separate structure here
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* to demonstrate the pattern that most other allocators should follow. */
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typedef struct _wmem_simple_allocator_t {
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GHashTable *block_table;
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} wmem_simple_allocator_t;
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static void *
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wmem_simple_alloc(void *private_data, const size_t size)
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{
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void *buf;
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wmem_simple_allocator_t *allocator;
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allocator = (wmem_simple_allocator_t*) private_data;
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buf = wmem_alloc(NULL, size);
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g_hash_table_insert(allocator->block_table, buf, buf);
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return buf;
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}
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static void
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wmem_simple_do_free(gpointer ptr)
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{
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wmem_free(NULL, ptr);
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}
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static void
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wmem_simple_free(void *private_data, void *ptr)
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{
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gboolean removed;
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wmem_simple_allocator_t *allocator;
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allocator = (wmem_simple_allocator_t*) private_data;
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/* remove() takes care of calling wmem_free() for us since we set up the
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* hash table with g_hash_table_new_full() */
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removed = g_hash_table_remove(allocator->block_table, ptr);
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g_assert(removed);
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}
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static void *
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wmem_simple_realloc(void *private_data, void *ptr, const size_t size)
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{ void *newptr;
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wmem_simple_allocator_t *allocator;
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allocator = (wmem_simple_allocator_t*) private_data;
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newptr = wmem_realloc(NULL, ptr, size);
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if (ptr != newptr) {
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/* Realloc actually moved the memory block, so we need to replace the
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* value in our hash table. Calling g_hash_table_remove() would trigger
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* a wmem_free() which is incorrect since realloc already reclaimed the old
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* block, so use g_hash_table_steal() instead. */
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g_hash_table_steal(allocator->block_table, ptr);
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g_hash_table_insert(allocator->block_table, newptr, newptr);
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}
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return newptr;
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}
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static void
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wmem_simple_free_all(void *private_data)
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{
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wmem_simple_allocator_t *allocator;
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allocator = (wmem_simple_allocator_t*) private_data;
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/* remove_all() takes care of calling wmem_free() for us since we set up the
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* hash table with g_hash_table_new_full() */
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g_hash_table_remove_all(allocator->block_table);
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}
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static void
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wmem_simple_gc(void *private_data _U_)
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{
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/* In this simple allocator, there is nothing to garbage-collect */
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}
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static void
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wmem_simple_allocator_cleanup(void *private_data)
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{
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wmem_simple_allocator_t *allocator;
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allocator = (wmem_simple_allocator_t*) private_data;
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g_hash_table_destroy(allocator->block_table);
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wmem_free(NULL, allocator);
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}
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void
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wmem_simple_allocator_init(wmem_allocator_t *allocator)
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{
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wmem_simple_allocator_t *simple_allocator;
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simple_allocator = wmem_new(NULL, wmem_simple_allocator_t);
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allocator->alloc = &wmem_simple_alloc;
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allocator->realloc = &wmem_simple_realloc;
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allocator->free = &wmem_simple_free;
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allocator->free_all = &wmem_simple_free_all;
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allocator->gc = &wmem_simple_gc;
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allocator->cleanup = &wmem_simple_allocator_cleanup;
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allocator->private_data = (void*) simple_allocator;
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simple_allocator->block_table = g_hash_table_new_full(
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&g_direct_hash, &g_direct_equal, NULL, &wmem_simple_do_free);
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}
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/*
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* Editor modelines - http://www.wireshark.org/tools/modelines.html
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*
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* Local variables:
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* c-basic-offset: 4
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* tab-width: 8
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* indent-tabs-mode: nil
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* End:
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*
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* vi: set shiftwidth=4 tabstop=8 expandtab:
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* :indentSize=4:tabSize=8:noTabs=true:
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*/
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