macros.h revision 9695b7bc89781c40aeb545ac0e879ff063590bf0 
1/*
2 * Copyright (C) 2016 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#ifndef CHRE_UTIL_MACROS_H_
18#define CHRE_UTIL_MACROS_H_
19
20/**
21 * Obtains the number of elements in a C-style array.
22 */
23#define ARRAY_SIZE(array) (sizeof(array) / sizeof((array)[0]))
24
25/**
26 * Performs macro expansion then converts the value into a string literal
27 */
28#define STRINGIFY(x) STRINGIFY2(x)
29#define STRINGIFY2(x) #x
30
31/**
32 * Exports a symbol with default visibility.
33 */
34#if defined(__clang__) || defined(__GNUC__)
35#define DLL_EXPORT __attribute__((visibility("default")))
36#else
37#warn "DLL_EXPORT left undefined"
38#endif
39
40#endif  // CHRE_UTIL_MACROS_H_
41