1b8e80941Smrg/**************************************************************************
2b8e80941Smrg *
3b8e80941Smrg * Copyright 2015 VMware, Inc.
4b8e80941Smrg * All Rights Reserved.
5b8e80941Smrg *
6b8e80941Smrg * Permission is hereby granted, free of charge, to any person obtaining a
7b8e80941Smrg * copy of this software and associated documentation files (the
8b8e80941Smrg * "Software"), to deal in the Software without restriction, including
9b8e80941Smrg * without limitation the rights to use, copy, modify, merge, publish,
10b8e80941Smrg * distribute, sub license, and/or sell copies of the Software, and to
11b8e80941Smrg * permit persons to whom the Software is furnished to do so, subject to
12b8e80941Smrg * the following conditions:
13b8e80941Smrg *
14b8e80941Smrg * The above copyright notice and this permission notice (including the
15b8e80941Smrg * next paragraph) shall be included in all copies or substantial portions
16b8e80941Smrg * of the Software.
17b8e80941Smrg *
18b8e80941Smrg * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
19b8e80941Smrg * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
20b8e80941Smrg * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
21b8e80941Smrg * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
22b8e80941Smrg * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
23b8e80941Smrg * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
24b8e80941Smrg * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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26b8e80941Smrg **************************************************************************/
27b8e80941Smrg
28b8e80941Smrg#ifndef NIR_VLA_H
29b8e80941Smrg#define NIR_VLA_H
30b8e80941Smrg
31b8e80941Smrg#include "c99_alloca.h"
32b8e80941Smrg
33b8e80941Smrg
34b8e80941Smrg/* Declare a variable length array, with no initialization */
35b8e80941Smrg#define NIR_VLA(_type, _name, _length) \
36b8e80941Smrg   _type *_name = alloca((_length) * sizeof *_name)
37b8e80941Smrg
38b8e80941Smrg
39b8e80941Smrg/* Declare a variable length array, and initialize it with the given byte.
40b8e80941Smrg *
41b8e80941Smrg * _length is evaluated twice, so expressions with side-effects must be
42b8e80941Smrg * avoided.
43b8e80941Smrg */
44b8e80941Smrg#define NIR_VLA_FILL(_type, _name, _length, _byte) \
45b8e80941Smrg   _type *_name = memset(alloca((_length) * sizeof *_name), _byte, (_length) * sizeof *_name)
46b8e80941Smrg
47b8e80941Smrg
48b8e80941Smrg/* Declare a variable length array, and zero it.
49b8e80941Smrg *
50b8e80941Smrg * Just like NIR_VLA_FILL, _length is evaluated twice, so expressions with
51b8e80941Smrg * side-effects must be avoided.
52b8e80941Smrg */
53b8e80941Smrg#define NIR_VLA_ZERO(_type, _name, _length) \
54b8e80941Smrg   NIR_VLA_FILL(_type, _name, _length, 0)
55b8e80941Smrg
56b8e80941Smrg#endif /* NIR_VLA_H */
57