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_ALIGN(value, alignment) \
44 (((value) + (alignment) - 1) & ~((alignment) - 1))
45
46 #define BIONIC_ROUND_UP_POWER_OF_2(value) \
47 ((sizeof(value) == 8) \
48 ? (1UL << (64 - __builtin_clzl(static_cast<unsigned long>(value)))) \
49 : (1UL << (32 - __builtin_clz(static_cast<unsigned int>(value)))))
50
align_down(uintptr_t p,size_t align)51 static constexpr uintptr_t align_down(uintptr_t p, size_t align) {
52 return p & ~(align - 1);
53 }
54
align_up(uintptr_t p,size_t align)55 static constexpr uintptr_t align_up(uintptr_t p, size_t align) {
56 return (p + align - 1) & ~(align - 1);
57 }
58
59 template <typename T>
align_down(T * p,size_t align)60 static inline T* align_down(T* p, size_t align) {
61 return reinterpret_cast<T*>(align_down(reinterpret_cast<uintptr_t>(p), align));
62 }
63
64 template <typename T>
align_up(T * p,size_t align)65 static inline T* align_up(T* p, size_t align) {
66 return reinterpret_cast<T*>(align_up(reinterpret_cast<uintptr_t>(p), align));
67 }
68
69 #endif // _BIONIC_MACROS_H_
70