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_REF_BASE_H |
| 18 | #define ANDROID_REF_BASE_H |
| 19 | |
Hans Boehm | e263e6c | 2016-05-11 18:15:12 -0700 | [diff] [blame] | 20 | #include <atomic> |
The Android Open Source Project | cbb1011 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 21 | |
| 22 | #include <stdint.h> |
| 23 | #include <sys/types.h> |
| 24 | #include <stdlib.h> |
Mathias Agopian | b26ea8b | 2011-02-16 20:23:43 -0800 | [diff] [blame] | 25 | #include <string.h> |
| 26 | |
| 27 | #include <utils/StrongPointer.h> |
Jeff Brown | 9a0a76d | 2012-03-16 14:45:49 -0700 | [diff] [blame] | 28 | #include <utils/TypeHelpers.h> |
The Android Open Source Project | cbb1011 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 29 | |
| 30 | // --------------------------------------------------------------------------- |
| 31 | namespace android { |
| 32 | |
Mathias Agopian | 84a23fa | 2011-02-16 15:23:08 -0800 | [diff] [blame] | 33 | class TextOutput; |
Mathias Agopian | 84a23fa | 2011-02-16 15:23:08 -0800 | [diff] [blame] | 34 | TextOutput& printWeakPointer(TextOutput& to, const void* val); |
| 35 | |
The Android Open Source Project | cbb1011 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 36 | // --------------------------------------------------------------------------- |
| 37 | |
Mathias Agopian | ff49de7 | 2011-02-09 18:38:55 -0800 | [diff] [blame] | 38 | #define COMPARE_WEAK(_op_) \ |
The Android Open Source Project | cbb1011 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 39 | inline bool operator _op_ (const sp<T>& o) const { \ |
| 40 | return m_ptr _op_ o.m_ptr; \ |
| 41 | } \ |
The Android Open Source Project | cbb1011 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 42 | inline bool operator _op_ (const T* o) const { \ |
| 43 | return m_ptr _op_ o; \ |
| 44 | } \ |
| 45 | template<typename U> \ |
| 46 | inline bool operator _op_ (const sp<U>& o) const { \ |
| 47 | return m_ptr _op_ o.m_ptr; \ |
| 48 | } \ |
| 49 | template<typename U> \ |
Mathias Agopian | ff49de7 | 2011-02-09 18:38:55 -0800 | [diff] [blame] | 50 | inline bool operator _op_ (const U* o) const { \ |
| 51 | return m_ptr _op_ o; \ |
| 52 | } |
| 53 | |
Mathias Agopian | b26ea8b | 2011-02-16 20:23:43 -0800 | [diff] [blame] | 54 | // --------------------------------------------------------------------------- |
Mathias Agopian | 6cd548c | 2013-03-18 22:27:41 -0700 | [diff] [blame] | 55 | |
| 56 | class ReferenceRenamer { |
| 57 | protected: |
| 58 | // destructor is purposedly not virtual so we avoid code overhead from |
| 59 | // subclasses; we have to make it protected to guarantee that it |
| 60 | // cannot be called from this base class (and to make strict compilers |
| 61 | // happy). |
| 62 | ~ReferenceRenamer() { } |
Mathias Agopian | b26ea8b | 2011-02-16 20:23:43 -0800 | [diff] [blame] | 63 | public: |
Mathias Agopian | 6cd548c | 2013-03-18 22:27:41 -0700 | [diff] [blame] | 64 | virtual void operator()(size_t i) const = 0; |
Mathias Agopian | b26ea8b | 2011-02-16 20:23:43 -0800 | [diff] [blame] | 65 | }; |
The Android Open Source Project | cbb1011 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 66 | |
| 67 | // --------------------------------------------------------------------------- |
| 68 | |
| 69 | class RefBase |
| 70 | { |
| 71 | public: |
| 72 | void incStrong(const void* id) const; |
| 73 | void decStrong(const void* id) const; |
| 74 | |
| 75 | void forceIncStrong(const void* id) const; |
| 76 | |
| 77 | //! DEBUGGING ONLY: Get current strong ref count. |
| 78 | int32_t getStrongCount() const; |
| 79 | |
| 80 | class weakref_type |
| 81 | { |
| 82 | public: |
| 83 | RefBase* refBase() const; |
| 84 | |
| 85 | void incWeak(const void* id); |
| 86 | void decWeak(const void* id); |
| 87 | |
Mathias Agopian | ad09965 | 2011-08-10 21:07:02 -0700 | [diff] [blame] | 88 | // acquires a strong reference if there is already one. |
The Android Open Source Project | cbb1011 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 89 | bool attemptIncStrong(const void* id); |
| 90 | |
Mathias Agopian | ad09965 | 2011-08-10 21:07:02 -0700 | [diff] [blame] | 91 | // acquires a weak reference if there is already one. |
| 92 | // This is not always safe. see ProcessState.cpp and BpBinder.cpp |
| 93 | // for proper use. |
The Android Open Source Project | cbb1011 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 94 | bool attemptIncWeak(const void* id); |
| 95 | |
| 96 | //! DEBUGGING ONLY: Get current weak ref count. |
| 97 | int32_t getWeakCount() const; |
| 98 | |
| 99 | //! DEBUGGING ONLY: Print references held on object. |
| 100 | void printRefs() const; |
| 101 | |
| 102 | //! DEBUGGING ONLY: Enable tracking for this object. |
| 103 | // enable -- enable/disable tracking |
| 104 | // retain -- when tracking is enable, if true, then we save a stack trace |
| 105 | // for each reference and dereference; when retain == false, we |
| 106 | // match up references and dereferences and keep only the |
| 107 | // outstanding ones. |
| 108 | |
| 109 | void trackMe(bool enable, bool retain); |
| 110 | }; |
| 111 | |
| 112 | weakref_type* createWeak(const void* id) const; |
| 113 | |
| 114 | weakref_type* getWeakRefs() const; |
| 115 | |
| 116 | //! DEBUGGING ONLY: Print references held on object. |
| 117 | inline void printRefs() const { getWeakRefs()->printRefs(); } |
| 118 | |
| 119 | //! DEBUGGING ONLY: Enable tracking of object. |
| 120 | inline void trackMe(bool enable, bool retain) |
| 121 | { |
| 122 | getWeakRefs()->trackMe(enable, retain); |
| 123 | } |
| 124 | |
Mathias Agopian | b26ea8b | 2011-02-16 20:23:43 -0800 | [diff] [blame] | 125 | typedef RefBase basetype; |
| 126 | |
The Android Open Source Project | cbb1011 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 127 | protected: |
| 128 | RefBase(); |
| 129 | virtual ~RefBase(); |
Mathias Agopian | 7f57eac | 2011-06-16 17:15:51 -0700 | [diff] [blame] | 130 | |
The Android Open Source Project | cbb1011 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 131 | //! Flags for extendObjectLifetime() |
| 132 | enum { |
Mathias Agopian | ad09965 | 2011-08-10 21:07:02 -0700 | [diff] [blame] | 133 | OBJECT_LIFETIME_STRONG = 0x0000, |
The Android Open Source Project | cbb1011 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 134 | OBJECT_LIFETIME_WEAK = 0x0001, |
Mathias Agopian | ad09965 | 2011-08-10 21:07:02 -0700 | [diff] [blame] | 135 | OBJECT_LIFETIME_MASK = 0x0001 |
The Android Open Source Project | cbb1011 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 136 | }; |
| 137 | |
| 138 | void extendObjectLifetime(int32_t mode); |
| 139 | |
| 140 | //! Flags for onIncStrongAttempted() |
| 141 | enum { |
| 142 | FIRST_INC_STRONG = 0x0001 |
| 143 | }; |
| 144 | |
| 145 | virtual void onFirstRef(); |
| 146 | virtual void onLastStrongRef(const void* id); |
| 147 | virtual bool onIncStrongAttempted(uint32_t flags, const void* id); |
| 148 | virtual void onLastWeakRef(const void* id); |
| 149 | |
| 150 | private: |
| 151 | friend class weakref_type; |
| 152 | class weakref_impl; |
| 153 | |
| 154 | RefBase(const RefBase& o); |
| 155 | RefBase& operator=(const RefBase& o); |
Mathias Agopian | ad09965 | 2011-08-10 21:07:02 -0700 | [diff] [blame] | 156 | |
Mathias Agopian | 6cd548c | 2013-03-18 22:27:41 -0700 | [diff] [blame] | 157 | private: |
| 158 | friend class ReferenceMover; |
| 159 | |
| 160 | static void renameRefs(size_t n, const ReferenceRenamer& renamer); |
| 161 | |
| 162 | static void renameRefId(weakref_type* ref, |
| 163 | const void* old_id, const void* new_id); |
| 164 | |
| 165 | static void renameRefId(RefBase* ref, |
| 166 | const void* old_id, const void* new_id); |
| 167 | |
The Android Open Source Project | cbb1011 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 168 | weakref_impl* const mRefs; |
| 169 | }; |
| 170 | |
| 171 | // --------------------------------------------------------------------------- |
| 172 | |
| 173 | template <class T> |
| 174 | class LightRefBase |
| 175 | { |
| 176 | public: |
| 177 | inline LightRefBase() : mCount(0) { } |
Igor Murashkin | a27c1e0 | 2012-12-05 16:10:26 -0800 | [diff] [blame] | 178 | inline void incStrong(__attribute__((unused)) const void* id) const { |
Hans Boehm | e263e6c | 2016-05-11 18:15:12 -0700 | [diff] [blame] | 179 | mCount.fetch_add(1, std::memory_order_relaxed); |
The Android Open Source Project | cbb1011 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 180 | } |
Igor Murashkin | a27c1e0 | 2012-12-05 16:10:26 -0800 | [diff] [blame] | 181 | inline void decStrong(__attribute__((unused)) const void* id) const { |
Hans Boehm | e263e6c | 2016-05-11 18:15:12 -0700 | [diff] [blame] | 182 | if (mCount.fetch_sub(1, std::memory_order_release) == 1) { |
| 183 | std::atomic_thread_fence(std::memory_order_acquire); |
The Android Open Source Project | cbb1011 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 184 | delete static_cast<const T*>(this); |
| 185 | } |
| 186 | } |
Mathias Agopian | 019f8ed | 2009-05-04 14:17:04 -0700 | [diff] [blame] | 187 | //! DEBUGGING ONLY: Get current strong ref count. |
| 188 | inline int32_t getStrongCount() const { |
Hans Boehm | e263e6c | 2016-05-11 18:15:12 -0700 | [diff] [blame] | 189 | return mCount.load(std::memory_order_relaxed); |
Mathias Agopian | 019f8ed | 2009-05-04 14:17:04 -0700 | [diff] [blame] | 190 | } |
Mathias Agopian | b26ea8b | 2011-02-16 20:23:43 -0800 | [diff] [blame] | 191 | |
| 192 | typedef LightRefBase<T> basetype; |
| 193 | |
The Android Open Source Project | cbb1011 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 194 | protected: |
| 195 | inline ~LightRefBase() { } |
Mathias Agopian | b26ea8b | 2011-02-16 20:23:43 -0800 | [diff] [blame] | 196 | |
| 197 | private: |
| 198 | friend class ReferenceMover; |
Greg Kaiser | d9885e7 | 2016-07-08 17:18:07 -0700 | [diff] [blame] | 199 | inline static void renameRefs(size_t /*n*/, |
| 200 | const ReferenceRenamer& /*renamer*/) { } |
| 201 | inline static void renameRefId(T* /*ref*/, |
| 202 | const void* /*old_id*/ , const void* /*new_id*/) { } |
Mathias Agopian | b26ea8b | 2011-02-16 20:23:43 -0800 | [diff] [blame] | 203 | |
The Android Open Source Project | cbb1011 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 204 | private: |
Hans Boehm | e263e6c | 2016-05-11 18:15:12 -0700 | [diff] [blame] | 205 | mutable std::atomic<int32_t> mCount; |
The Android Open Source Project | cbb1011 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 206 | }; |
| 207 | |
John Reck | d83186c | 2014-05-09 15:27:22 -0700 | [diff] [blame] | 208 | // This is a wrapper around LightRefBase that simply enforces a virtual |
| 209 | // destructor to eliminate the template requirement of LightRefBase |
| 210 | class VirtualLightRefBase : public LightRefBase<VirtualLightRefBase> { |
| 211 | public: |
| 212 | virtual ~VirtualLightRefBase() {} |
| 213 | }; |
| 214 | |
The Android Open Source Project | cbb1011 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 215 | // --------------------------------------------------------------------------- |
| 216 | |
| 217 | template <typename T> |
The Android Open Source Project | cbb1011 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 218 | class wp |
| 219 | { |
| 220 | public: |
| 221 | typedef typename RefBase::weakref_type weakref_type; |
| 222 | |
| 223 | inline wp() : m_ptr(0) { } |
| 224 | |
Chih-Hung Hsieh | 2a92996 | 2016-08-02 12:14:47 -0700 | [diff] [blame^] | 225 | wp(T* other); // NOLINT(implicit) |
The Android Open Source Project | cbb1011 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 226 | wp(const wp<T>& other); |
Chih-Hung Hsieh | 2a92996 | 2016-08-02 12:14:47 -0700 | [diff] [blame^] | 227 | explicit wp(const sp<T>& other); |
| 228 | template<typename U> wp(U* other); // NOLINT(implicit) |
| 229 | template<typename U> wp(const sp<U>& other); // NOLINT(implicit) |
| 230 | template<typename U> wp(const wp<U>& other); // NOLINT(implicit) |
The Android Open Source Project | cbb1011 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 231 | |
| 232 | ~wp(); |
| 233 | |
| 234 | // Assignment |
| 235 | |
| 236 | wp& operator = (T* other); |
| 237 | wp& operator = (const wp<T>& other); |
| 238 | wp& operator = (const sp<T>& other); |
| 239 | |
| 240 | template<typename U> wp& operator = (U* other); |
| 241 | template<typename U> wp& operator = (const wp<U>& other); |
| 242 | template<typename U> wp& operator = (const sp<U>& other); |
| 243 | |
| 244 | void set_object_and_refs(T* other, weakref_type* refs); |
| 245 | |
| 246 | // promotion to sp |
| 247 | |
| 248 | sp<T> promote() const; |
| 249 | |
| 250 | // Reset |
| 251 | |
| 252 | void clear(); |
| 253 | |
| 254 | // Accessors |
| 255 | |
| 256 | inline weakref_type* get_refs() const { return m_refs; } |
| 257 | |
| 258 | inline T* unsafe_get() const { return m_ptr; } |
| 259 | |
| 260 | // Operators |
Mathias Agopian | ff49de7 | 2011-02-09 18:38:55 -0800 | [diff] [blame] | 261 | |
| 262 | COMPARE_WEAK(==) |
| 263 | COMPARE_WEAK(!=) |
| 264 | COMPARE_WEAK(>) |
| 265 | COMPARE_WEAK(<) |
| 266 | COMPARE_WEAK(<=) |
| 267 | COMPARE_WEAK(>=) |
| 268 | |
| 269 | inline bool operator == (const wp<T>& o) const { |
| 270 | return (m_ptr == o.m_ptr) && (m_refs == o.m_refs); |
| 271 | } |
| 272 | template<typename U> |
| 273 | inline bool operator == (const wp<U>& o) const { |
| 274 | return m_ptr == o.m_ptr; |
| 275 | } |
| 276 | |
| 277 | inline bool operator > (const wp<T>& o) const { |
| 278 | return (m_ptr == o.m_ptr) ? (m_refs > o.m_refs) : (m_ptr > o.m_ptr); |
| 279 | } |
| 280 | template<typename U> |
| 281 | inline bool operator > (const wp<U>& o) const { |
| 282 | return (m_ptr == o.m_ptr) ? (m_refs > o.m_refs) : (m_ptr > o.m_ptr); |
| 283 | } |
| 284 | |
| 285 | inline bool operator < (const wp<T>& o) const { |
| 286 | return (m_ptr == o.m_ptr) ? (m_refs < o.m_refs) : (m_ptr < o.m_ptr); |
| 287 | } |
| 288 | template<typename U> |
| 289 | inline bool operator < (const wp<U>& o) const { |
| 290 | return (m_ptr == o.m_ptr) ? (m_refs < o.m_refs) : (m_ptr < o.m_ptr); |
| 291 | } |
| 292 | inline bool operator != (const wp<T>& o) const { return m_refs != o.m_refs; } |
| 293 | template<typename U> inline bool operator != (const wp<U>& o) const { return !operator == (o); } |
| 294 | inline bool operator <= (const wp<T>& o) const { return !operator > (o); } |
| 295 | template<typename U> inline bool operator <= (const wp<U>& o) const { return !operator > (o); } |
| 296 | inline bool operator >= (const wp<T>& o) const { return !operator < (o); } |
| 297 | template<typename U> inline bool operator >= (const wp<U>& o) const { return !operator < (o); } |
The Android Open Source Project | cbb1011 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 298 | |
| 299 | private: |
| 300 | template<typename Y> friend class sp; |
| 301 | template<typename Y> friend class wp; |
| 302 | |
| 303 | T* m_ptr; |
| 304 | weakref_type* m_refs; |
| 305 | }; |
| 306 | |
| 307 | template <typename T> |
| 308 | TextOutput& operator<<(TextOutput& to, const wp<T>& val); |
| 309 | |
Mathias Agopian | ff49de7 | 2011-02-09 18:38:55 -0800 | [diff] [blame] | 310 | #undef COMPARE_WEAK |
The Android Open Source Project | cbb1011 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 311 | |
| 312 | // --------------------------------------------------------------------------- |
| 313 | // No user serviceable parts below here. |
| 314 | |
| 315 | template<typename T> |
The Android Open Source Project | cbb1011 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 316 | wp<T>::wp(T* other) |
| 317 | : m_ptr(other) |
| 318 | { |
| 319 | if (other) m_refs = other->createWeak(this); |
| 320 | } |
| 321 | |
| 322 | template<typename T> |
| 323 | wp<T>::wp(const wp<T>& other) |
| 324 | : m_ptr(other.m_ptr), m_refs(other.m_refs) |
| 325 | { |
| 326 | if (m_ptr) m_refs->incWeak(this); |
| 327 | } |
| 328 | |
| 329 | template<typename T> |
| 330 | wp<T>::wp(const sp<T>& other) |
| 331 | : m_ptr(other.m_ptr) |
| 332 | { |
| 333 | if (m_ptr) { |
| 334 | m_refs = m_ptr->createWeak(this); |
| 335 | } |
| 336 | } |
| 337 | |
| 338 | template<typename T> template<typename U> |
| 339 | wp<T>::wp(U* other) |
| 340 | : m_ptr(other) |
| 341 | { |
| 342 | if (other) m_refs = other->createWeak(this); |
| 343 | } |
| 344 | |
| 345 | template<typename T> template<typename U> |
| 346 | wp<T>::wp(const wp<U>& other) |
| 347 | : m_ptr(other.m_ptr) |
| 348 | { |
| 349 | if (m_ptr) { |
| 350 | m_refs = other.m_refs; |
| 351 | m_refs->incWeak(this); |
| 352 | } |
| 353 | } |
| 354 | |
| 355 | template<typename T> template<typename U> |
| 356 | wp<T>::wp(const sp<U>& other) |
| 357 | : m_ptr(other.m_ptr) |
| 358 | { |
| 359 | if (m_ptr) { |
| 360 | m_refs = m_ptr->createWeak(this); |
| 361 | } |
| 362 | } |
| 363 | |
| 364 | template<typename T> |
| 365 | wp<T>::~wp() |
| 366 | { |
| 367 | if (m_ptr) m_refs->decWeak(this); |
| 368 | } |
| 369 | |
| 370 | template<typename T> |
| 371 | wp<T>& wp<T>::operator = (T* other) |
| 372 | { |
| 373 | weakref_type* newRefs = |
| 374 | other ? other->createWeak(this) : 0; |
| 375 | if (m_ptr) m_refs->decWeak(this); |
| 376 | m_ptr = other; |
| 377 | m_refs = newRefs; |
| 378 | return *this; |
| 379 | } |
| 380 | |
| 381 | template<typename T> |
| 382 | wp<T>& wp<T>::operator = (const wp<T>& other) |
| 383 | { |
Mathias Agopian | 7b15167 | 2010-06-24 21:49:02 -0700 | [diff] [blame] | 384 | weakref_type* otherRefs(other.m_refs); |
| 385 | T* otherPtr(other.m_ptr); |
| 386 | if (otherPtr) otherRefs->incWeak(this); |
The Android Open Source Project | cbb1011 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 387 | if (m_ptr) m_refs->decWeak(this); |
Mathias Agopian | 7b15167 | 2010-06-24 21:49:02 -0700 | [diff] [blame] | 388 | m_ptr = otherPtr; |
| 389 | m_refs = otherRefs; |
The Android Open Source Project | cbb1011 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 390 | return *this; |
| 391 | } |
| 392 | |
| 393 | template<typename T> |
| 394 | wp<T>& wp<T>::operator = (const sp<T>& other) |
| 395 | { |
| 396 | weakref_type* newRefs = |
| 397 | other != NULL ? other->createWeak(this) : 0; |
Mathias Agopian | 7b15167 | 2010-06-24 21:49:02 -0700 | [diff] [blame] | 398 | T* otherPtr(other.m_ptr); |
The Android Open Source Project | cbb1011 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 399 | if (m_ptr) m_refs->decWeak(this); |
Mathias Agopian | 7b15167 | 2010-06-24 21:49:02 -0700 | [diff] [blame] | 400 | m_ptr = otherPtr; |
The Android Open Source Project | cbb1011 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 401 | m_refs = newRefs; |
| 402 | return *this; |
| 403 | } |
| 404 | |
| 405 | template<typename T> template<typename U> |
| 406 | wp<T>& wp<T>::operator = (U* other) |
| 407 | { |
| 408 | weakref_type* newRefs = |
| 409 | other ? other->createWeak(this) : 0; |
| 410 | if (m_ptr) m_refs->decWeak(this); |
| 411 | m_ptr = other; |
| 412 | m_refs = newRefs; |
| 413 | return *this; |
| 414 | } |
| 415 | |
| 416 | template<typename T> template<typename U> |
| 417 | wp<T>& wp<T>::operator = (const wp<U>& other) |
| 418 | { |
Mathias Agopian | 7b15167 | 2010-06-24 21:49:02 -0700 | [diff] [blame] | 419 | weakref_type* otherRefs(other.m_refs); |
| 420 | U* otherPtr(other.m_ptr); |
| 421 | if (otherPtr) otherRefs->incWeak(this); |
The Android Open Source Project | cbb1011 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 422 | if (m_ptr) m_refs->decWeak(this); |
Mathias Agopian | 7b15167 | 2010-06-24 21:49:02 -0700 | [diff] [blame] | 423 | m_ptr = otherPtr; |
| 424 | m_refs = otherRefs; |
The Android Open Source Project | cbb1011 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 425 | return *this; |
| 426 | } |
| 427 | |
| 428 | template<typename T> template<typename U> |
| 429 | wp<T>& wp<T>::operator = (const sp<U>& other) |
| 430 | { |
| 431 | weakref_type* newRefs = |
| 432 | other != NULL ? other->createWeak(this) : 0; |
Mathias Agopian | 7b15167 | 2010-06-24 21:49:02 -0700 | [diff] [blame] | 433 | U* otherPtr(other.m_ptr); |
The Android Open Source Project | cbb1011 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 434 | if (m_ptr) m_refs->decWeak(this); |
Mathias Agopian | 7b15167 | 2010-06-24 21:49:02 -0700 | [diff] [blame] | 435 | m_ptr = otherPtr; |
The Android Open Source Project | cbb1011 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 436 | m_refs = newRefs; |
| 437 | return *this; |
| 438 | } |
| 439 | |
| 440 | template<typename T> |
| 441 | void wp<T>::set_object_and_refs(T* other, weakref_type* refs) |
| 442 | { |
| 443 | if (other) refs->incWeak(this); |
| 444 | if (m_ptr) m_refs->decWeak(this); |
| 445 | m_ptr = other; |
| 446 | m_refs = refs; |
| 447 | } |
| 448 | |
| 449 | template<typename T> |
| 450 | sp<T> wp<T>::promote() const |
| 451 | { |
Mathias Agopian | 3e0f875 | 2011-02-24 18:12:34 -0800 | [diff] [blame] | 452 | sp<T> result; |
| 453 | if (m_ptr && m_refs->attemptIncStrong(&result)) { |
| 454 | result.set_pointer(m_ptr); |
| 455 | } |
| 456 | return result; |
The Android Open Source Project | cbb1011 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 457 | } |
| 458 | |
| 459 | template<typename T> |
| 460 | void wp<T>::clear() |
| 461 | { |
| 462 | if (m_ptr) { |
| 463 | m_refs->decWeak(this); |
| 464 | m_ptr = 0; |
| 465 | } |
| 466 | } |
| 467 | |
| 468 | template <typename T> |
| 469 | inline TextOutput& operator<<(TextOutput& to, const wp<T>& val) |
| 470 | { |
Mathias Agopian | 84a23fa | 2011-02-16 15:23:08 -0800 | [diff] [blame] | 471 | return printWeakPointer(to, val.unsafe_get()); |
The Android Open Source Project | cbb1011 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 472 | } |
| 473 | |
Mathias Agopian | b26ea8b | 2011-02-16 20:23:43 -0800 | [diff] [blame] | 474 | // --------------------------------------------------------------------------- |
| 475 | |
| 476 | // this class just serves as a namespace so TYPE::moveReferences can stay |
| 477 | // private. |
Mathias Agopian | b26ea8b | 2011-02-16 20:23:43 -0800 | [diff] [blame] | 478 | class ReferenceMover { |
Mathias Agopian | b26ea8b | 2011-02-16 20:23:43 -0800 | [diff] [blame] | 479 | public: |
Mathias Agopian | 6cd548c | 2013-03-18 22:27:41 -0700 | [diff] [blame] | 480 | // it would be nice if we could make sure no extra code is generated |
| 481 | // for sp<TYPE> or wp<TYPE> when TYPE is a descendant of RefBase: |
| 482 | // Using a sp<RefBase> override doesn't work; it's a bit like we wanted |
| 483 | // a template<typename TYPE inherits RefBase> template... |
| 484 | |
Mathias Agopian | b26ea8b | 2011-02-16 20:23:43 -0800 | [diff] [blame] | 485 | template<typename TYPE> static inline |
| 486 | void move_references(sp<TYPE>* d, sp<TYPE> const* s, size_t n) { |
Mathias Agopian | 6cd548c | 2013-03-18 22:27:41 -0700 | [diff] [blame] | 487 | |
| 488 | class Renamer : public ReferenceRenamer { |
| 489 | sp<TYPE>* d; |
| 490 | sp<TYPE> const* s; |
| 491 | virtual void operator()(size_t i) const { |
| 492 | // The id are known to be the sp<>'s this pointer |
| 493 | TYPE::renameRefId(d[i].get(), &s[i], &d[i]); |
| 494 | } |
| 495 | public: |
Ukri Niemimuukko | 00e56a2 | 2014-04-29 06:25:28 +0800 | [diff] [blame] | 496 | Renamer(sp<TYPE>* d, sp<TYPE> const* s) : d(d), s(s) { } |
| 497 | virtual ~Renamer() { } |
Mathias Agopian | 6cd548c | 2013-03-18 22:27:41 -0700 | [diff] [blame] | 498 | }; |
| 499 | |
Mathias Agopian | b26ea8b | 2011-02-16 20:23:43 -0800 | [diff] [blame] | 500 | memmove(d, s, n*sizeof(sp<TYPE>)); |
Mathias Agopian | 6cd548c | 2013-03-18 22:27:41 -0700 | [diff] [blame] | 501 | TYPE::renameRefs(n, Renamer(d, s)); |
Mathias Agopian | b26ea8b | 2011-02-16 20:23:43 -0800 | [diff] [blame] | 502 | } |
Mathias Agopian | 6cd548c | 2013-03-18 22:27:41 -0700 | [diff] [blame] | 503 | |
| 504 | |
Mathias Agopian | b26ea8b | 2011-02-16 20:23:43 -0800 | [diff] [blame] | 505 | template<typename TYPE> static inline |
| 506 | void move_references(wp<TYPE>* d, wp<TYPE> const* s, size_t n) { |
Mathias Agopian | 6cd548c | 2013-03-18 22:27:41 -0700 | [diff] [blame] | 507 | |
| 508 | class Renamer : public ReferenceRenamer { |
| 509 | wp<TYPE>* d; |
| 510 | wp<TYPE> const* s; |
| 511 | virtual void operator()(size_t i) const { |
| 512 | // The id are known to be the wp<>'s this pointer |
| 513 | TYPE::renameRefId(d[i].get_refs(), &s[i], &d[i]); |
| 514 | } |
| 515 | public: |
Ukri Niemimuukko | 00e56a2 | 2014-04-29 06:25:28 +0800 | [diff] [blame] | 516 | Renamer(wp<TYPE>* d, wp<TYPE> const* s) : d(d), s(s) { } |
| 517 | virtual ~Renamer() { } |
Mathias Agopian | 6cd548c | 2013-03-18 22:27:41 -0700 | [diff] [blame] | 518 | }; |
| 519 | |
Mathias Agopian | b26ea8b | 2011-02-16 20:23:43 -0800 | [diff] [blame] | 520 | memmove(d, s, n*sizeof(wp<TYPE>)); |
Mathias Agopian | 6cd548c | 2013-03-18 22:27:41 -0700 | [diff] [blame] | 521 | TYPE::renameRefs(n, Renamer(d, s)); |
Mathias Agopian | b26ea8b | 2011-02-16 20:23:43 -0800 | [diff] [blame] | 522 | } |
| 523 | }; |
| 524 | |
| 525 | // specialization for moving sp<> and wp<> types. |
| 526 | // these are used by the [Sorted|Keyed]Vector<> implementations |
| 527 | // sp<> and wp<> need to be handled specially, because they do not |
| 528 | // have trivial copy operation in the general case (see RefBase.cpp |
| 529 | // when DEBUG ops are enabled), but can be implemented very |
| 530 | // efficiently in most cases. |
| 531 | |
| 532 | template<typename TYPE> inline |
| 533 | void move_forward_type(sp<TYPE>* d, sp<TYPE> const* s, size_t n) { |
| 534 | ReferenceMover::move_references(d, s, n); |
| 535 | } |
| 536 | |
| 537 | template<typename TYPE> inline |
| 538 | void move_backward_type(sp<TYPE>* d, sp<TYPE> const* s, size_t n) { |
| 539 | ReferenceMover::move_references(d, s, n); |
| 540 | } |
| 541 | |
| 542 | template<typename TYPE> inline |
| 543 | void move_forward_type(wp<TYPE>* d, wp<TYPE> const* s, size_t n) { |
| 544 | ReferenceMover::move_references(d, s, n); |
| 545 | } |
| 546 | |
| 547 | template<typename TYPE> inline |
| 548 | void move_backward_type(wp<TYPE>* d, wp<TYPE> const* s, size_t n) { |
| 549 | ReferenceMover::move_references(d, s, n); |
| 550 | } |
| 551 | |
| 552 | |
The Android Open Source Project | cbb1011 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 553 | }; // namespace android |
| 554 | |
| 555 | // --------------------------------------------------------------------------- |
| 556 | |
| 557 | #endif // ANDROID_REF_BASE_H |