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 #ifndef ARRAY_SIZE 28 #define ARRAY_SIZE(array) (sizeof(array) / sizeof((array)[0])) 29 #endif 30 31 #ifndef ARRAY_END 32 #define ARRAY_END(array) (array + ARRAY_SIZE(array)) 33 #endif 34 35 /** Determines if the provided bit is set in the provided value. */ 36 #ifndef IS_BIT_SET 37 #define IS_BIT_SET(value, bit) (((value) & (bit)) == (bit)) 38 #endif 39 40 /** 41 * Performs macro expansion then converts the value into a string literal 42 */ 43 #ifndef STRINGIFY 44 #define STRINGIFY(x) STRINGIFY2(x) 45 #define STRINGIFY2(x) #x 46 #endif 47 48 /** 49 * Checks if a bitmask contains the specified value 50 */ 51 #ifndef BITMASK_HAS_VALUE 52 #define BITMASK_HAS_VALUE(mask, value) ((mask & value) == value) 53 #endif 54 55 /** 56 * Min/max macros. 57 */ 58 #ifndef MIN 59 #define MIN(a, b) ((a) < (b) ? (a) : (b)) 60 #endif 61 62 #ifndef MAX 63 #define MAX(a, b) ((a) > (b) ? (a) : (b)) 64 #endif 65 66 // Compiler-specific functionality 67 #if defined(__clang__) || defined(__GNUC__) 68 69 //! Exports a symbol so it is accessible outside the .so (symbols are hidden by 70 //! default) 71 #define DLL_EXPORT __attribute__((visibility("default"))) 72 73 //! Marks a symbol as weak, so that it may be overridden at link time 74 #define WEAK_SYMBOL __attribute__((weak)) 75 76 #else 77 78 #warning "Missing compiler-specific macros" 79 80 #endif 81 82 #endif // CHRE_UTIL_MACROS_H_ 83
