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 #ifndef UNUSED_VAR 21 #define UNUSED_VAR(var) ((void)(var)) 22 #endif 23 24 /** 25 * Obtains the number of elements in a C-style array. 26 */ 27 #define ARRAY_SIZE(array) (sizeof(array) / sizeof((array)[0])) 28 #define ARRAY_END(array) (array + ARRAY_SIZE(array)) 29 30 /** 31 * Performs macro expansion then converts the value into a string literal 32 */ 33 #define STRINGIFY(x) STRINGIFY2(x) 34 #define STRINGIFY2(x) #x 35 36 // Compiler-specific functionality 37 #if defined(__clang__) || defined(__GNUC__) 38 39 //! Exports a symbol so it is accessible outside the .so (symbols are hidden by 40 //! default) 41 #define DLL_EXPORT __attribute__((visibility("default"))) 42 43 //! Marks a symbol as weak, so that it may be overridden at link time 44 #define WEAK_SYMBOL __attribute__((weak)) 45 46 #else 47 48 #warning "Missing compiler-specific macros" 49 50 #endif 51 52 #endif // CHRE_UTIL_MACROS_H_ 53