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106 lines
3.9 KiB
C++
106 lines
3.9 KiB
C++
/*
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* Copyright (C) 2010 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef _BIONIC_MACROS_H_
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#define _BIONIC_MACROS_H_
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#include <stdint.h>
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// Frameworks OpenGL code currently leaks this header and allows
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// collisions with other declarations, e.g., from libnativehelper.
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// TODO: Remove once cleaned up. b/18334516
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#if !defined(DISALLOW_COPY_AND_ASSIGN)
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// DISALLOW_COPY_AND_ASSIGN disallows the copy and operator= functions.
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// It goes in the private: declarations in a class.
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#define DISALLOW_COPY_AND_ASSIGN(TypeName) \
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TypeName(const TypeName&) = delete; \
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void operator=(const TypeName&) = delete
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#endif // !defined(DISALLOW_COPY_AND_ASSIGN)
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// A macro to disallow all the implicit constructors, namely the
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// default constructor, copy constructor and operator= functions.
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//
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// This should be used in the private: declarations for a class
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// that wants to prevent anyone from instantiating it. This is
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// especially useful for classes containing only static methods.
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#define DISALLOW_IMPLICIT_CONSTRUCTORS(TypeName) \
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TypeName() = delete; \
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DISALLOW_COPY_AND_ASSIGN(TypeName)
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#define BIONIC_ROUND_UP_POWER_OF_2(value) \
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((sizeof(value) == 8) \
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? (1UL << (64 - __builtin_clzl(static_cast<unsigned long>(value)))) \
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: (1UL << (32 - __builtin_clz(static_cast<unsigned int>(value)))))
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static constexpr uintptr_t align_down(uintptr_t p, size_t align) {
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return p & ~(align - 1);
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}
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static constexpr uintptr_t align_up(uintptr_t p, size_t align) {
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return (p + align - 1) & ~(align - 1);
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}
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template <typename T>
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static inline T* align_down(T* p, size_t align) {
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return reinterpret_cast<T*>(align_down(reinterpret_cast<uintptr_t>(p), align));
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}
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template <typename T>
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static inline T* align_up(T* p, size_t align) {
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return reinterpret_cast<T*>(align_up(reinterpret_cast<uintptr_t>(p), align));
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}
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#if defined(__arm__)
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// Do not emit anything for arm, clang does not allow emiting an arm unwind
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// directive.
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// #define BIONIC_STOP_UNWIND asm volatile(".cantunwind")
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#define BIONIC_STOP_UNWIND
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#elif defined(__aarch64__)
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#define BIONIC_STOP_UNWIND asm volatile(".cfi_undefined x30")
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#elif defined(__i386__)
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#define BIONIC_STOP_UNWIND asm volatile(".cfi_undefined \%eip")
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#elif defined(__x86_64__)
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#define BIONIC_STOP_UNWIND asm volatile(".cfi_undefined \%rip")
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#elif defined (__mips__)
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#define BIONIC_STOP_UNWIND asm volatile(".cfi_undefined $ra")
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#endif
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// The arraysize(arr) macro returns the # of elements in an array arr.
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// The expression is a compile-time constant, and therefore can be
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// used in defining new arrays, for example. If you use arraysize on
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// a pointer by mistake, you will get a compile-time error.
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//
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// One caveat is that arraysize() doesn't accept any array of an
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// anonymous type or a type defined inside a function.
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//
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// This template function declaration is used in defining arraysize.
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// Note that the function doesn't need an implementation, as we only
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// use its type.
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template <typename T, size_t N>
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char (&ArraySizeHelper(T (&array)[N]))[N]; // NOLINT(readability/casting)
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#define arraysize(array) (sizeof(ArraySizeHelper(array)))
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// Used to inform clang's -Wimplicit-fallthrough that a fallthrough is intended. There's no way to
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// silence (or enable, apparently) -Wimplicit-fallthrough in C yet.
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#ifdef __cplusplus
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#define __BIONIC_FALLTHROUGH [[clang::fallthrough]]
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#else
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#define __BIONIC_FALLTHROUGH
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#endif
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#endif // _BIONIC_MACROS_H_
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