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/*
* 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/locks.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_
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