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70bd0a12 JD |
1 | #ifndef _BABELTRACE_INTERNAL_H |
2 | #define _BABELTRACE_INTERNAL_H | |
3 | ||
eb31c5e6 | 4 | /* |
91d81473 | 5 | * Copyright 2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
eb31c5e6 MD |
6 | * |
7 | * Permission is hereby granted, free of charge, to any person obtaining a copy | |
8 | * of this software and associated documentation files (the "Software"), to deal | |
9 | * in the Software without restriction, including without limitation the rights | |
10 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
11 | * copies of the Software, and to permit persons to whom the Software is | |
12 | * furnished to do so, subject to the following conditions: | |
13 | * | |
14 | * The above copyright notice and this permission notice shall be included in | |
15 | * all copies or substantial portions of the Software. | |
c462e188 MD |
16 | * |
17 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
18 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
19 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | |
20 | * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
21 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
22 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | |
23 | * SOFTWARE. | |
eb31c5e6 | 24 | */ |
fd3c708f | 25 | |
70bd0a12 | 26 | |
91d81473 | 27 | #define bt_max_t(type, a, b) \ |
f3e4505b | 28 | ((type) (a) > (type) (b) ? (type) (a) : (type) (b)) |
f3e4505b | 29 | |
5d6c80a5 JD |
30 | /* |
31 | * BT_HIDDEN: set the hidden attribute for internal functions | |
675860f4 MJ |
32 | * On Windows, symbols are local unless explicitly exported, |
33 | * see https://gcc.gnu.org/wiki/Visibility | |
5d6c80a5 | 34 | */ |
675860f4 MJ |
35 | #if defined(_WIN32) || defined(__CYGWIN__) |
36 | #define BT_HIDDEN | |
37 | #else | |
5d6c80a5 | 38 | #define BT_HIDDEN __attribute__((visibility("hidden"))) |
675860f4 | 39 | #endif |
5d6c80a5 | 40 | |
55b71f05 SM |
41 | /* |
42 | * Yield `ref`'s value while setting `ref` to NULL. | |
43 | * | |
44 | * This can be used to give a strong reference to a callee: | |
45 | * | |
46 | * add_foo_to_list(list, BT_MOVE_REF(foo)); | |
47 | * | |
48 | * or in a simple assignment: | |
49 | * | |
50 | * my_struct->foo = BT_MOVE_REF(foo); | |
51 | * | |
52 | * When moving a reference in a function call, the reference is given to the | |
53 | * callee even if that function call fails, so make sure the called function | |
54 | * is written accordingly. | |
55 | */ | |
56 | ||
57 | #define BT_MOVE_REF(ref) \ | |
58 | ({ \ | |
e3d110d6 | 59 | typeof(ref) _ref = ref; \ |
55b71f05 SM |
60 | ref = NULL; \ |
61 | _ref; \ | |
62 | }) | |
63 | ||
70bd0a12 | 64 | #endif |