| /* |
| * Copyright (C) 2011 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. |
| */ |
| |
| #ifndef ART_RUNTIME_INTERPRETER_LOCK_COUNT_DATA_H_ |
| #define ART_RUNTIME_INTERPRETER_LOCK_COUNT_DATA_H_ |
| |
| #include <memory> |
| #include <vector> |
| |
| #include "base/mutex.h" |
| |
| namespace art { |
| |
| namespace mirror { |
| class Object; |
| } // namespace mirror |
| |
| class Thread; |
| |
| // Counting locks by storing object pointers into a vector. Duplicate entries mark recursive locks. |
| // The vector will be visited with the ShadowFrame during GC (so all the locked-on objects are |
| // thread roots). |
| // Note: implementation is split so that the call sites may be optimized to no-ops in case no |
| // lock counting is necessary. The actual implementation is in the cc file to avoid |
| // dependencies. |
| class LockCountData { |
| public: |
| // Add the given object to the list of monitors, that is, objects that have been locked. This |
| // will not throw (but be skipped if there is an exception pending on entry). |
| void AddMonitor(Thread* self, mirror::Object* obj) REQUIRES_SHARED(Locks::mutator_lock_); |
| |
| // Try to remove the given object from the monitor list, indicating an unlock operation. |
| // This will throw an IllegalMonitorStateException (clearing any already pending exception), in |
| // case that there wasn't a lock recorded for the object. |
| void RemoveMonitorOrThrow(Thread* self, |
| const mirror::Object* obj) REQUIRES_SHARED(Locks::mutator_lock_); |
| |
| // Check whether all acquired monitors have been released. This will potentially throw an |
| // IllegalMonitorStateException, clearing any already pending exception. Returns true if the |
| // check shows that everything is OK wrt/ lock counting, false otherwise. |
| bool CheckAllMonitorsReleasedOrThrow(Thread* self) REQUIRES_SHARED(Locks::mutator_lock_); |
| |
| template <typename T, typename... Args> |
| void VisitMonitors(T visitor, Args&&... args) REQUIRES_SHARED(Locks::mutator_lock_) { |
| if (monitors_ != nullptr) { |
| // Visitors may change the Object*. Be careful with the foreach loop. |
| for (mirror::Object*& obj : *monitors_) { |
| visitor(/* inout */ &obj, std::forward<Args>(args)...); |
| } |
| } |
| } |
| |
| private: |
| // Stores references to the locked-on objects. As noted, this should be visited during thread |
| // marking. |
| std::unique_ptr<std::vector<mirror::Object*>> monitors_; |
| }; |
| |
| } // namespace art |
| |
| #endif // ART_RUNTIME_INTERPRETER_LOCK_COUNT_DATA_H_ |