1 /* 2 * Copyright (C) 2010 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 _BIONIC_MACROS_H_ 18 #define _BIONIC_MACROS_H_ 19 20 #include <stdint.h> 21 22 // Frameworks OpenGL code currently leaks this header and allows 23 // collisions with other declarations, e.g., from libnativehelper. 24 // TODO: Remove once cleaned up. b/18334516 25 #if !defined(DISALLOW_COPY_AND_ASSIGN) 26 // DISALLOW_COPY_AND_ASSIGN disallows the copy and operator= functions. 27 // It goes in the private: declarations in a class. 28 #define DISALLOW_COPY_AND_ASSIGN(TypeName) \ 29 TypeName(const TypeName&) = delete; \ 30 void operator=(const TypeName&) = delete 31 #endif // !defined(DISALLOW_COPY_AND_ASSIGN) 32 33 // A macro to disallow all the implicit constructors, namely the 34 // default constructor, copy constructor and operator= functions. 35 // 36 // This should be used in the private: declarations for a class 37 // that wants to prevent anyone from instantiating it. This is 38 // especially useful for classes containing only static methods. 39 #define DISALLOW_IMPLICIT_CONSTRUCTORS(TypeName) \ 40 TypeName() = delete; \ 41 DISALLOW_COPY_AND_ASSIGN(TypeName) 42 43 #define BIONIC_ROUND_UP_POWER_OF_2(value) \ 44 ((sizeof(value) == 8) \ 45 ? (1UL << (64 - __builtin_clzl(static_cast<unsigned long>(value)))) \ 46 : (1UL << (32 - __builtin_clz(static_cast<unsigned int>(value))))) 47 48 static constexpr uintptr_t align_down(uintptr_t p, size_t align) { 49 return p & ~(align - 1); 50 } 51 52 static constexpr uintptr_t align_up(uintptr_t p, size_t align) { 53 return (p + align - 1) & ~(align - 1); 54 } 55 56 template <typename T> 57 static inline T* align_down(T* p, size_t align) { 58 return reinterpret_cast<T*>(align_down(reinterpret_cast<uintptr_t>(p), align)); 59 } 60 61 template <typename T> 62 static inline T* align_up(T* p, size_t align) { 63 return reinterpret_cast<T*>(align_up(reinterpret_cast<uintptr_t>(p), align)); 64 } 65 66 #if defined(__arm__) 67 // Do not emit anything for arm, clang does not allow emiting an arm unwind 68 // directive. 69 // #define BIONIC_STOP_UNWIND asm volatile(".cantunwind") 70 #define BIONIC_STOP_UNWIND 71 #elif defined(__aarch64__) 72 #define BIONIC_STOP_UNWIND asm volatile(".cfi_undefined x30") 73 #elif defined(__i386__) 74 #define BIONIC_STOP_UNWIND asm volatile(".cfi_undefined \%eip") 75 #elif defined(__x86_64__) 76 #define BIONIC_STOP_UNWIND asm volatile(".cfi_undefined \%rip") 77 #elif defined (__mips__) 78 #define BIONIC_STOP_UNWIND asm volatile(".cfi_undefined $ra") 79 #endif 80 81 // The arraysize(arr) macro returns the # of elements in an array arr. 82 // The expression is a compile-time constant, and therefore can be 83 // used in defining new arrays, for example. If you use arraysize on 84 // a pointer by mistake, you will get a compile-time error. 85 // 86 // One caveat is that arraysize() doesn't accept any array of an 87 // anonymous type or a type defined inside a function. 88 // 89 // This template function declaration is used in defining arraysize. 90 // Note that the function doesn't need an implementation, as we only 91 // use its type. 92 template <typename T, size_t N> 93 char (&ArraySizeHelper(T (&array)[N]))[N]; // NOLINT(readability/casting) 94 95 #define arraysize(array) (sizeof(ArraySizeHelper(array))) 96 97 #endif // _BIONIC_MACROS_H_ 98
