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 /** 67 * Obtain the number of arguments passed into a macro up till 20 args 68 */ 69 #define VA_NUM_ARGS(...) \ 70 VA_NUM_ARGS_IMPL(__VA_ARGS__, 20, 19, 18, 17, 16, 15, 14, 13, 12, 11, 10, 9, \ 71 8, 7, 6, 5, 4, 3, 2, 1) 72 #define VA_NUM_ARGS_IMPL(_1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, \ 73 _13, _14_, _15, _16, _17, _18, _19, _20, N, ...) \ 74 N 75 76 /** 77 * Concats two preprocessor tokens together. 78 * If passed in args are macros, they are resolved first, then concat'd 79 */ 80 #define MACRO_CONCAT2(x, y) x##y 81 #define MACRO_CONCAT(x, y) MACRO_CONCAT2(x, y) 82 83 /** 84 * Get a list of types of the passed in parameters to TYPE_LIST(...) 85 */ 86 #define TYPE_LIST_1(a) decltype(a) 87 #define TYPE_LIST_2(a, ...) decltype(a), TYPE_LIST_1(__VA_ARGS__) 88 #define TYPE_LIST_3(a, ...) decltype(a), TYPE_LIST_2(__VA_ARGS__) 89 #define TYPE_LIST_4(a, ...) decltype(a), TYPE_LIST_3(__VA_ARGS__) 90 #define TYPE_LIST_5(a, ...) decltype(a), TYPE_LIST_4(__VA_ARGS__) 91 #define TYPE_LIST_6(a, ...) decltype(a), TYPE_LIST_5(__VA_ARGS__) 92 #define TYPE_LIST_7(a, ...) decltype(a), TYPE_LIST_6(__VA_ARGS__) 93 #define TYPE_LIST_8(a, ...) decltype(a), TYPE_LIST_7(__VA_ARGS__) 94 #define TYPE_LIST_9(a, ...) decltype(a), TYPE_LIST_8(__VA_ARGS__) 95 #define TYPE_LIST_10(a, ...) decltype(a), TYPE_LIST_9(__VA_ARGS__) 96 #define TYPE_LIST_11(a, ...) decltype(a), TYPE_LIST_10(__VA_ARGS__) 97 #define TYPE_LIST_12(a, ...) decltype(a), TYPE_LIST_11(__VA_ARGS__) 98 #define TYPE_LIST_13(a, ...) decltype(a), TYPE_LIST_12(__VA_ARGS__) 99 #define TYPE_LIST_14(a, ...) decltype(a), TYPE_LIST_13(__VA_ARGS__) 100 #define TYPE_LIST_15(a, ...) decltype(a), TYPE_LIST_14(__VA_ARGS__) 101 #define TYPE_LIST_16(a, ...) decltype(a), TYPE_LIST_15(__VA_ARGS__) 102 #define TYPE_LIST_17(a, ...) decltype(a), TYPE_LIST_16(__VA_ARGS__) 103 #define TYPE_LIST_18(a, ...) decltype(a), TYPE_LIST_17(__VA_ARGS__) 104 #define TYPE_LIST_19(a, ...) decltype(a), TYPE_LIST_18(__VA_ARGS__) 105 #define TYPE_LIST_20(a, ...) decltype(a), TYPE_LIST_19(__VA_ARGS__) 106 107 #define TYPE_LIST(...) \ 108 MACRO_CONCAT(TYPE_LIST_, VA_NUM_ARGS(__VA_ARGS__))(__VA_ARGS__) 109 110 // Compiler-specific functionality 111 #if defined(__clang__) || defined(__GNUC__) 112 113 //! Exports a symbol so it is accessible outside the .so (symbols are hidden by 114 //! default) 115 #define DLL_EXPORT __attribute__((visibility("default"))) 116 117 //! Marks a symbol as weak, so that it may be overridden at link time 118 #define WEAK_SYMBOL __attribute__((weak)) 119 120 #else 121 122 #warning "Missing compiler-specific macros" 123 124 #endif 125 126 #endif // CHRE_UTIL_MACROS_H_ 127