add linklist stack macros, use where over allocating an array was previously done.

1 files changed, 90 insertions, 0 deletions

diff --git a/source/blender/blenlib/BLI_linklist_stack.h b/source/blender/blenlib/BLI_linklist_stack.h
new file mode 100644
index 00000000000..82ca986d9ca
--- /dev/null
+++ b/source/blender/blenlib/BLI_linklist_stack.h
@@ -0,0 +1,90 @@
+/*
+ * ***** BEGIN GPL LICENSE BLOCK *****
+ *
+ * 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.
+ *
+ * The Original Code is Copyright (C) 2001-2002 by NaN Holding BV.
+ * All rights reserved.
+ *
+ * The Original Code is: all of this file.
+ *
+ * Contributor(s): none yet.
+ *
+ * ***** END GPL LICENSE BLOCK *****
+ */
+ 
+#ifndef __BLI_LINKLIST_STACK_H__
+#define __BLI_LINKLIST_STACK_H__
+
+/** \file BLI_linklist_stack.h
+ * \ingroup bli
+ * \brief BLI_LINKSTACK_*** wrapper macros for using a \a LinkNode
+ *        to store a stack of pointers, using a single linked list
+ *        allocated from a mempool.
+ *
+ * \note These macros follow STACK_* macros defined in 'BLI_utildefines.h'
+ *       and should be kept (mostly) interchangeable.
+ *
+ * \note _##var##_type is a dummy var only used for typechecks.
+ */
+
+#define BLI_LINKSTACK_DECLARE(var, type) \
+	LinkNode *var; \
+	BLI_mempool *_##var##_pool; \
+	type _##var##_type
+
+#define BLI_LINKSTACK_INIT(var)  { \
+	var = NULL; \
+	_##var##_pool = BLI_mempool_create(sizeof(LinkNode), 1, 64, 0); \
+} (void)0
+
+#define BLI_LINKSTACK_SIZE(var) \
+	BLI_mempool_count(_##var##_pool)
+
+/* check for typeof() */
+#ifdef __GNUC__
+#define BLI_LINKSTACK_PUSH(var, ptr)  ( \
+	CHECK_TYPE_INLINE(ptr, typeof(_##var##_type)), \
+	BLI_linklist_prepend_pool(&(var), ptr, _##var##_pool))
+#define BLI_LINKSTACK_POP(var) \
+	(var ? (typeof(_##var##_type))BLI_linklist_pop_pool(&(var), _##var##_pool) : NULL)
+#define BLI_LINKSTACK_POP_ELSE(var, r) \
+	(var ? (typeof(_##var##_type))BLI_linklist_pop_pool(&(var), _##var##_pool) : r)
+#else  /* non gcc */
+#define BLI_LINKSTACK_PUSH(var, ptr)  ( \
+	BLI_linklist_prepend_pool(&(var), ptr, _##var##_pool))
+#define BLI_LINKSTACK_POP(var) \
+	(var ? BLI_linklist_pop_pool(&(var), _##var##_pool) : NULL)
+#define BLI_LINKSTACK_POP_ELSE(var, r) \
+	(var ? BLI_linklist_pop_pool(&(var), _##var##_pool) : r)
+#endif  /* gcc check */
+
+#define BLI_LINKSTACK_SWAP(var_a, var_b)  { \
+	CHECK_TYPE_PAIR(_##var_a##_type, _##var_b##_type); \
+	SWAP(LinkNode *, var_a, var_b); \
+	SWAP(BLI_mempool *, _##var_a##_pool, _##var_b##_pool); \
+} (void)0
+
+#define BLI_LINKSTACK_FREE(var)  { \
+	BLI_mempool_destroy(_##var##_pool); \
+	_##var##_pool = NULL; (void)_##var##_pool; \
+	var = NULL; (void)var; \
+	(void)_##var##_type; \
+} (void)0
+
+#include "BLI_linklist.h"
+#include "BLI_mempool.h"
+
+#endif  /* __BLI_LINKLIST_STACK_H__ */