1 /*
2  * Copyright © 2020 Red Hat Inc.
3  *
4  * Permission is hereby granted, free of charge, to any person obtaining a
5  * copy of this software and associated documentation files (the "Software"),
6  * to deal in the Software without restriction, including without limitation
7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8  * and/or sell copies of the Software, and to permit persons to whom the
9  * Software is furnished to do so, subject to the following conditions:
10  *
11  * The above copyright notice and this permission notice (including the next
12  * paragraph) shall be included in all copies or substantial portions of the
13  * Software.
14  *
15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
21  * IN THE SOFTWARE.
22  */
23 
24 #ifdef __cplusplus
25 
26 #include "macros.h"
27 #include <type_traits>
28 
29 // some enum helpers
30 #define MESA_DEFINE_CPP_ENUM_BINARY_OPERATOR(Enum, op) \
31 extern "C++" {                                         \
32 UNUSED static constexpr                                \
33 Enum operator op (Enum a, Enum b)                      \
34 {                                                      \
35    using IntType = std::underlying_type_t<Enum>;       \
36    IntType ua = static_cast<IntType>(a);               \
37    IntType ub = static_cast<IntType>(b);               \
38    return static_cast<Enum>(ua op ub);                 \
39 }                                                      \
40                                                        \
41 UNUSED static constexpr                                \
42 Enum& operator op##= (Enum &a, Enum b)                 \
43 {                                                      \
44    using IntType = std::underlying_type_t<Enum>;       \
45    IntType ua = static_cast<IntType>(a);               \
46    IntType ub = static_cast<IntType>(b);               \
47    ua op##= ub;                                        \
48    a = static_cast<Enum>(ua);                          \
49    return a;                                           \
50 }                                                      \
51 }
52 
53 #define MESA_DEFINE_CPP_ENUM_UNARY_OPERATOR(Enum, op) \
54 extern "C++" {                                        \
55 UNUSED static constexpr                               \
56 Enum operator op (Enum a)                             \
57 {                                                     \
58    using IntType = std::underlying_type_t<Enum>;      \
59    IntType ua = static_cast<IntType>(a);              \
60    return static_cast<Enum>(op ua);                   \
61 }                                                     \
62 }
63 
64 #define MESA_DEFINE_CPP_ENUM_BITFIELD_OPERATORS(Enum) \
65 MESA_DEFINE_CPP_ENUM_BINARY_OPERATOR(Enum, |)         \
66 MESA_DEFINE_CPP_ENUM_BINARY_OPERATOR(Enum, &)         \
67 MESA_DEFINE_CPP_ENUM_BINARY_OPERATOR(Enum, ^)         \
68 MESA_DEFINE_CPP_ENUM_UNARY_OPERATOR(Enum, ~)
69 
70 #else
71 
72 #define MESA_DEFINE_CPP_ENUM_BITFIELD_OPERATORS(Enum)
73 
74 #endif
75