1 /* 2 * Copyright (C) 2022 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 INCLUDE_PERFETTO_PUBLIC_COMPILER_H_ 18 #define INCLUDE_PERFETTO_PUBLIC_COMPILER_H_ 19 20 #include <stddef.h> 21 22 #if defined(__GNUC__) || defined(__clang__) 23 #define PERFETTO_LIKELY(_x) __builtin_expect(!!(_x), 1) 24 #define PERFETTO_UNLIKELY(_x) __builtin_expect(!!(_x), 0) 25 #else 26 #define PERFETTO_LIKELY(_x) (_x) 27 #define PERFETTO_UNLIKELY(_x) (_x) 28 #endif 29 30 // PERFETTO_STATIC_CAST(TYPE, VAL): avoids the -Wold-style-cast warning when 31 // writing code that needs to be compiled as C and C++. 32 #ifdef __cplusplus 33 #define PERFETTO_STATIC_CAST(TYPE, VAL) static_cast<TYPE>(VAL) 34 #else 35 #define PERFETTO_STATIC_CAST(TYPE, VAL) ((TYPE)(VAL)) 36 #endif 37 38 // PERFETTO_REINTERPRET_CAST(TYPE, VAL): avoids the -Wold-style-cast warning 39 // when writing code that needs to be compiled as C and C++. 40 #ifdef __cplusplus 41 #define PERFETTO_REINTERPRET_CAST(TYPE, VAL) reinterpret_cast<TYPE>(VAL) 42 #else 43 #define PERFETTO_REINTERPRET_CAST(TYPE, VAL) ((TYPE)(VAL)) 44 #endif 45 46 // PERFETTO_NULL: avoids the -Wzero-as-null-pointer-constant warning when 47 // writing code that needs to be compiled as C and C++. 48 #ifdef __cplusplus 49 #define PERFETTO_NULL nullptr 50 #else 51 #define PERFETTO_NULL NULL 52 #endif 53 54 #if defined(__clang__) 55 #define PERFETTO_ALWAYS_INLINE __attribute__((__always_inline__)) 56 #define PERFETTO_NO_INLINE __attribute__((__noinline__)) 57 #else 58 // GCC is too pedantic and often fails with the error: 59 // "always_inline function might not be inlinable" 60 #define PERFETTO_ALWAYS_INLINE 61 #define PERFETTO_NO_INLINE 62 #endif 63 64 #endif // INCLUDE_PERFETTO_PUBLIC_COMPILER_H_ 65