/* * Copyright (C) 2010 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ #pragma once #include <stdint.h> #define BIONIC_DISALLOW_COPY_AND_ASSIGN(TypeName) \ TypeName(const TypeName&) = delete; \ void operator=(const TypeName&) = delete #define BIONIC_DISALLOW_IMPLICIT_CONSTRUCTORS(TypeName) \ TypeName() = delete; \ BIONIC_DISALLOW_COPY_AND_ASSIGN(TypeName) #define BIONIC_ROUND_UP_POWER_OF_2(value) \ ((sizeof(value) == 8) \ ? (1UL << (64 - __builtin_clzl(static_cast<unsigned long>(value)))) \ : (1UL << (32 - __builtin_clz(static_cast<unsigned int>(value))))) static constexpr uintptr_t align_down(uintptr_t p, size_t align) { return p & ~(align - 1); } static constexpr uintptr_t align_up(uintptr_t p, size_t align) { return (p + align - 1) & ~(align - 1); } template <typename T> static inline T* align_down(T* p, size_t align) { return reinterpret_cast<T*>(align_down(reinterpret_cast<uintptr_t>(p), align)); } template <typename T> static inline T* align_up(T* p, size_t align) { return reinterpret_cast<T*>(align_up(reinterpret_cast<uintptr_t>(p), align)); } #if defined(__arm__) // Do not emit anything for arm, clang does not allow emiting an arm unwind // directive. // #define BIONIC_STOP_UNWIND asm volatile(".cantunwind") #define BIONIC_STOP_UNWIND #elif defined(__aarch64__) #define BIONIC_STOP_UNWIND asm volatile(".cfi_undefined x30") #elif defined(__i386__) #define BIONIC_STOP_UNWIND asm volatile(".cfi_undefined \%eip") #elif defined(__x86_64__) #define BIONIC_STOP_UNWIND asm volatile(".cfi_undefined \%rip") #elif defined (__mips__) #define BIONIC_STOP_UNWIND asm volatile(".cfi_undefined $ra") #endif // The arraysize(arr) macro returns the # of elements in an array arr. // The expression is a compile-time constant, and therefore can be // used in defining new arrays, for example. If you use arraysize on // a pointer by mistake, you will get a compile-time error. // // One caveat is that arraysize() doesn't accept any array of an // anonymous type or a type defined inside a function. // // This template function declaration is used in defining arraysize. // Note that the function doesn't need an implementation, as we only // use its type. template <typename T, size_t N> char (&ArraySizeHelper(T (&array)[N]))[N]; // NOLINT(readability/casting) #define arraysize(array) (sizeof(ArraySizeHelper(array))) // Used to inform clang's -Wimplicit-fallthrough that a fallthrough is intended. There's no way to // silence (or enable, apparently) -Wimplicit-fallthrough in C yet. #ifdef __cplusplus #define __BIONIC_FALLTHROUGH [[clang::fallthrough]] #else #define __BIONIC_FALLTHROUGH #endif