121 lines
2.7 KiB
C
121 lines
2.7 KiB
C
/*
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* ***** BEGIN GPL LICENSE BLOCK *****
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (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
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* The Original Code is Copyright (C) 2001-2002 by NaN Holding BV.
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* All rights reserved.
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*
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* The Original Code is: all of this file.
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*
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* Contributor(s): none yet.
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*
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* ***** END GPL LICENSE BLOCK *****
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* Efficient memory allocation for lots of similar small chunks.
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*/
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/** \file blender/blenlib/intern/BLI_memarena.c
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* \ingroup bli
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*/
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#include "MEM_guardedalloc.h"
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#include "BLI_memarena.h"
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#include "BLI_linklist.h"
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struct MemArena {
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unsigned char *curbuf;
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int bufsize, cursize;
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const char *name;
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int use_calloc;
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int align;
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LinkNode *bufs;
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};
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MemArena *BLI_memarena_new(const int bufsize, const char *name)
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{
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MemArena *ma = MEM_callocN(sizeof(*ma), "memarena");
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ma->bufsize = bufsize;
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ma->align = 8;
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ma->name = name;
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return ma;
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}
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void BLI_memarena_use_calloc(MemArena *ma)
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{
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ma->use_calloc = 1;
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}
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void BLI_memarena_use_malloc(MemArena *ma)
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{
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ma->use_calloc = 0;
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}
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void BLI_memarena_use_align(struct MemArena *ma, const int align)
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{
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/* align should be a power of two */
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ma->align = align;
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}
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void BLI_memarena_free(MemArena *ma)
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{
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BLI_linklist_freeN(ma->bufs);
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MEM_freeN(ma);
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}
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/* amt must be power of two */
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#define PADUP(num, amt) ((num + (amt - 1)) & ~(amt - 1))
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void *BLI_memarena_alloc(MemArena *ma, int size)
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{
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void *ptr;
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/* ensure proper alignment by rounding
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* size up to multiple of 8 */
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size = PADUP(size, ma->align);
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if (size > ma->cursize) {
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unsigned char *tmp;
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if (size > ma->bufsize - (ma->align - 1)) {
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ma->cursize = PADUP(size + 1, ma->align);
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}
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else
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ma->cursize = ma->bufsize;
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if (ma->use_calloc)
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ma->curbuf = MEM_callocN(ma->cursize, ma->name);
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else
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ma->curbuf = MEM_mallocN(ma->cursize, ma->name);
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BLI_linklist_prepend(&ma->bufs, ma->curbuf);
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/* align alloc'ed memory (needed if align > 8) */
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tmp = (unsigned char *)PADUP( (intptr_t) ma->curbuf, ma->align);
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ma->cursize -= (tmp - ma->curbuf);
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ma->curbuf = tmp;
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}
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ptr = ma->curbuf;
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ma->curbuf += size;
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ma->cursize -= size;
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return ptr;
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}
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