The Android Open Source Project | cbb1011 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2005 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 ANDROID_TYPE_HELPERS_H |
| 18 | #define ANDROID_TYPE_HELPERS_H |
| 19 | |
| 20 | #include <new> |
| 21 | #include <stdint.h> |
| 22 | #include <string.h> |
| 23 | #include <sys/types.h> |
| 24 | |
| 25 | // --------------------------------------------------------------------------- |
| 26 | |
| 27 | namespace android { |
| 28 | |
| 29 | /* |
| 30 | * Types traits |
| 31 | */ |
The Android Open Source Project | cbb1011 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 32 | |
Mathias Agopian | a33bd16 | 2009-06-22 01:17:46 -0700 | [diff] [blame^] | 33 | template <typename T> struct trait_trivial_ctor { enum { value = false }; }; |
| 34 | template <typename T> struct trait_trivial_dtor { enum { value = false }; }; |
| 35 | template <typename T> struct trait_trivial_copy { enum { value = false }; }; |
| 36 | template <typename T> struct trait_trivial_move { enum { value = false }; }; |
| 37 | template <typename T> struct trait_pointer { enum { value = false }; }; |
| 38 | template <typename T> struct trait_pointer<T*> { enum { value = true }; }; |
The Android Open Source Project | cbb1011 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 39 | |
Mathias Agopian | a33bd16 | 2009-06-22 01:17:46 -0700 | [diff] [blame^] | 40 | // sp<> can be trivially moved |
| 41 | template <typename T> class sp; |
| 42 | template <typename T> struct trait_trivial_move< sp<T> >{ |
| 43 | enum { value = true }; |
| 44 | }; |
The Android Open Source Project | cbb1011 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 45 | |
Mathias Agopian | a33bd16 | 2009-06-22 01:17:46 -0700 | [diff] [blame^] | 46 | // wp<> can be trivially moved |
| 47 | template <typename T> class wp; |
| 48 | template <typename T> struct trait_trivial_move< wp<T> >{ |
| 49 | enum { value = true }; |
| 50 | }; |
The Android Open Source Project | cbb1011 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 51 | |
| 52 | template <typename TYPE> |
| 53 | struct traits { |
| 54 | enum { |
Mathias Agopian | a33bd16 | 2009-06-22 01:17:46 -0700 | [diff] [blame^] | 55 | // whether this type is a pointer |
The Android Open Source Project | cbb1011 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 56 | is_pointer = trait_pointer<TYPE>::value, |
Mathias Agopian | a33bd16 | 2009-06-22 01:17:46 -0700 | [diff] [blame^] | 57 | // whether this type's constructor is a no-op |
The Android Open Source Project | cbb1011 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 58 | has_trivial_ctor = is_pointer || trait_trivial_ctor<TYPE>::value, |
Mathias Agopian | a33bd16 | 2009-06-22 01:17:46 -0700 | [diff] [blame^] | 59 | // whether this type's destructor is a no-op |
The Android Open Source Project | cbb1011 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 60 | has_trivial_dtor = is_pointer || trait_trivial_dtor<TYPE>::value, |
Mathias Agopian | a33bd16 | 2009-06-22 01:17:46 -0700 | [diff] [blame^] | 61 | // whether this type type can be copy-constructed with memcpy |
The Android Open Source Project | cbb1011 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 62 | has_trivial_copy = is_pointer || trait_trivial_copy<TYPE>::value, |
Mathias Agopian | a33bd16 | 2009-06-22 01:17:46 -0700 | [diff] [blame^] | 63 | // whether this type can be moved with memmove |
| 64 | has_trivial_move = is_pointer || trait_trivial_move<TYPE>::value |
The Android Open Source Project | cbb1011 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 65 | }; |
| 66 | }; |
| 67 | |
| 68 | template <typename T, typename U> |
| 69 | struct aggregate_traits { |
| 70 | enum { |
| 71 | is_pointer = false, |
Mathias Agopian | a33bd16 | 2009-06-22 01:17:46 -0700 | [diff] [blame^] | 72 | has_trivial_ctor = |
| 73 | traits<T>::has_trivial_ctor && traits<U>::has_trivial_ctor, |
| 74 | has_trivial_dtor = |
| 75 | traits<T>::has_trivial_dtor && traits<U>::has_trivial_dtor, |
| 76 | has_trivial_copy = |
| 77 | traits<T>::has_trivial_copy && traits<U>::has_trivial_copy, |
| 78 | has_trivial_move = |
| 79 | traits<T>::has_trivial_move && traits<U>::has_trivial_move |
The Android Open Source Project | cbb1011 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 80 | }; |
| 81 | }; |
| 82 | |
Mathias Agopian | a33bd16 | 2009-06-22 01:17:46 -0700 | [diff] [blame^] | 83 | #define ANDROID_BASIC_TYPES_TRAITS( T ) \ |
| 84 | template<> struct trait_trivial_ctor< T > { enum { value = true }; }; \ |
| 85 | template<> struct trait_trivial_dtor< T > { enum { value = true }; }; \ |
| 86 | template<> struct trait_trivial_copy< T > { enum { value = true }; }; \ |
| 87 | template<> struct trait_trivial_move< T > { enum { value = true }; }; |
| 88 | |
The Android Open Source Project | cbb1011 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 89 | // --------------------------------------------------------------------------- |
| 90 | |
| 91 | /* |
| 92 | * basic types traits |
| 93 | */ |
Mathias Agopian | a33bd16 | 2009-06-22 01:17:46 -0700 | [diff] [blame^] | 94 | |
| 95 | ANDROID_BASIC_TYPES_TRAITS( void ) |
| 96 | ANDROID_BASIC_TYPES_TRAITS( bool ) |
| 97 | ANDROID_BASIC_TYPES_TRAITS( char ) |
| 98 | ANDROID_BASIC_TYPES_TRAITS( unsigned char ) |
| 99 | ANDROID_BASIC_TYPES_TRAITS( short ) |
| 100 | ANDROID_BASIC_TYPES_TRAITS( unsigned short ) |
| 101 | ANDROID_BASIC_TYPES_TRAITS( int ) |
| 102 | ANDROID_BASIC_TYPES_TRAITS( unsigned int ) |
| 103 | ANDROID_BASIC_TYPES_TRAITS( long ) |
| 104 | ANDROID_BASIC_TYPES_TRAITS( unsigned long ) |
| 105 | ANDROID_BASIC_TYPES_TRAITS( long long ) |
| 106 | ANDROID_BASIC_TYPES_TRAITS( unsigned long long ) |
| 107 | ANDROID_BASIC_TYPES_TRAITS( float ) |
| 108 | ANDROID_BASIC_TYPES_TRAITS( double ) |
The Android Open Source Project | cbb1011 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 109 | |
| 110 | // --------------------------------------------------------------------------- |
| 111 | |
Mathias Agopian | a33bd16 | 2009-06-22 01:17:46 -0700 | [diff] [blame^] | 112 | |
The Android Open Source Project | cbb1011 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 113 | /* |
| 114 | * compare and order types |
| 115 | */ |
| 116 | |
| 117 | template<typename TYPE> inline |
| 118 | int strictly_order_type(const TYPE& lhs, const TYPE& rhs) { |
| 119 | return (lhs < rhs) ? 1 : 0; |
| 120 | } |
| 121 | |
| 122 | template<typename TYPE> inline |
| 123 | int compare_type(const TYPE& lhs, const TYPE& rhs) { |
| 124 | return strictly_order_type(rhs, lhs) - strictly_order_type(lhs, rhs); |
| 125 | } |
| 126 | |
| 127 | /* |
Mathias Agopian | a33bd16 | 2009-06-22 01:17:46 -0700 | [diff] [blame^] | 128 | * create, destroy, copy and move types... |
The Android Open Source Project | cbb1011 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 129 | */ |
Mathias Agopian | a33bd16 | 2009-06-22 01:17:46 -0700 | [diff] [blame^] | 130 | |
The Android Open Source Project | cbb1011 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 131 | template<typename TYPE> inline |
| 132 | void construct_type(TYPE* p, size_t n) { |
| 133 | if (!traits<TYPE>::has_trivial_ctor) { |
| 134 | while (n--) { |
| 135 | new(p++) TYPE; |
| 136 | } |
| 137 | } |
| 138 | } |
| 139 | |
| 140 | template<typename TYPE> inline |
| 141 | void destroy_type(TYPE* p, size_t n) { |
| 142 | if (!traits<TYPE>::has_trivial_dtor) { |
| 143 | while (n--) { |
| 144 | p->~TYPE(); |
| 145 | p++; |
| 146 | } |
| 147 | } |
| 148 | } |
| 149 | |
| 150 | template<typename TYPE> inline |
| 151 | void copy_type(TYPE* d, const TYPE* s, size_t n) { |
| 152 | if (!traits<TYPE>::has_trivial_copy) { |
| 153 | while (n--) { |
| 154 | new(d) TYPE(*s); |
| 155 | d++, s++; |
| 156 | } |
| 157 | } else { |
| 158 | memcpy(d,s,n*sizeof(TYPE)); |
| 159 | } |
| 160 | } |
| 161 | |
| 162 | template<typename TYPE> inline |
The Android Open Source Project | cbb1011 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 163 | void splat_type(TYPE* where, const TYPE* what, size_t n) { |
| 164 | if (!traits<TYPE>::has_trivial_copy) { |
| 165 | while (n--) { |
| 166 | new(where) TYPE(*what); |
| 167 | where++; |
| 168 | } |
| 169 | } else { |
Mathias Agopian | a33bd16 | 2009-06-22 01:17:46 -0700 | [diff] [blame^] | 170 | while (n--) { |
| 171 | *where++ = *what; |
The Android Open Source Project | cbb1011 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 172 | } |
| 173 | } |
| 174 | } |
| 175 | |
| 176 | template<typename TYPE> inline |
| 177 | void move_forward_type(TYPE* d, const TYPE* s, size_t n = 1) { |
Mathias Agopian | a33bd16 | 2009-06-22 01:17:46 -0700 | [diff] [blame^] | 178 | if ((traits<TYPE>::has_trivial_dtor && traits<TYPE>::has_trivial_copy) |
| 179 | || traits<TYPE>::has_trivial_move) |
| 180 | { |
| 181 | memmove(d,s,n*sizeof(TYPE)); |
| 182 | } else { |
The Android Open Source Project | cbb1011 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 183 | d += n; |
| 184 | s += n; |
| 185 | while (n--) { |
| 186 | --d, --s; |
| 187 | if (!traits<TYPE>::has_trivial_copy) { |
| 188 | new(d) TYPE(*s); |
| 189 | } else { |
Mathias Agopian | a33bd16 | 2009-06-22 01:17:46 -0700 | [diff] [blame^] | 190 | *d = *s; |
The Android Open Source Project | cbb1011 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 191 | } |
| 192 | if (!traits<TYPE>::has_trivial_dtor) { |
| 193 | s->~TYPE(); |
| 194 | } |
| 195 | } |
The Android Open Source Project | cbb1011 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 196 | } |
| 197 | } |
| 198 | |
| 199 | template<typename TYPE> inline |
| 200 | void move_backward_type(TYPE* d, const TYPE* s, size_t n = 1) { |
Mathias Agopian | a33bd16 | 2009-06-22 01:17:46 -0700 | [diff] [blame^] | 201 | if ((traits<TYPE>::has_trivial_dtor && traits<TYPE>::has_trivial_copy) |
| 202 | || traits<TYPE>::has_trivial_move) |
| 203 | { |
| 204 | memmove(d,s,n*sizeof(TYPE)); |
| 205 | } else { |
The Android Open Source Project | cbb1011 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 206 | while (n--) { |
| 207 | if (!traits<TYPE>::has_trivial_copy) { |
| 208 | new(d) TYPE(*s); |
| 209 | } else { |
Mathias Agopian | a33bd16 | 2009-06-22 01:17:46 -0700 | [diff] [blame^] | 210 | *d = *s; |
The Android Open Source Project | cbb1011 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 211 | } |
| 212 | if (!traits<TYPE>::has_trivial_dtor) { |
| 213 | s->~TYPE(); |
| 214 | } |
| 215 | d++, s++; |
| 216 | } |
The Android Open Source Project | cbb1011 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 217 | } |
| 218 | } |
Mathias Agopian | a33bd16 | 2009-06-22 01:17:46 -0700 | [diff] [blame^] | 219 | |
| 220 | |
The Android Open Source Project | cbb1011 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 221 | // --------------------------------------------------------------------------- |
| 222 | |
| 223 | /* |
| 224 | * a key/value pair |
| 225 | */ |
| 226 | |
| 227 | template <typename KEY, typename VALUE> |
| 228 | struct key_value_pair_t { |
| 229 | KEY key; |
| 230 | VALUE value; |
| 231 | key_value_pair_t() { } |
| 232 | key_value_pair_t(const key_value_pair_t& o) : key(o.key), value(o.value) { } |
| 233 | key_value_pair_t(const KEY& k, const VALUE& v) : key(k), value(v) { } |
| 234 | key_value_pair_t(const KEY& k) : key(k) { } |
| 235 | inline bool operator < (const key_value_pair_t& o) const { |
| 236 | return strictly_order_type(key, o.key); |
| 237 | } |
| 238 | }; |
| 239 | |
| 240 | template<> |
| 241 | template <typename K, typename V> |
| 242 | struct trait_trivial_ctor< key_value_pair_t<K, V> > |
| 243 | { enum { value = aggregate_traits<K,V>::has_trivial_ctor }; }; |
| 244 | template<> |
| 245 | template <typename K, typename V> |
| 246 | struct trait_trivial_dtor< key_value_pair_t<K, V> > |
| 247 | { enum { value = aggregate_traits<K,V>::has_trivial_dtor }; }; |
| 248 | template<> |
| 249 | template <typename K, typename V> |
| 250 | struct trait_trivial_copy< key_value_pair_t<K, V> > |
| 251 | { enum { value = aggregate_traits<K,V>::has_trivial_copy }; }; |
| 252 | template<> |
| 253 | template <typename K, typename V> |
Mathias Agopian | a33bd16 | 2009-06-22 01:17:46 -0700 | [diff] [blame^] | 254 | struct trait_trivial_move< key_value_pair_t<K, V> > |
| 255 | { enum { value = aggregate_traits<K,V>::has_trivial_move }; }; |
The Android Open Source Project | cbb1011 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 256 | |
| 257 | // --------------------------------------------------------------------------- |
| 258 | |
| 259 | }; // namespace android |
| 260 | |
| 261 | // --------------------------------------------------------------------------- |
| 262 | |
| 263 | #endif // ANDROID_TYPE_HELPERS_H |