90 lines
3.2 KiB
C++
90 lines
3.2 KiB
C++
/*
|
|
* 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
|