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75 lines
2.9 KiB
75 lines
2.9 KiB
/*
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* Copyright (C) 2011 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef ART_RUNTIME_INTERPRETER_LOCK_COUNT_DATA_H_
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#define ART_RUNTIME_INTERPRETER_LOCK_COUNT_DATA_H_
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#include <memory>
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#include <vector>
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#include "base/locks.h"
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namespace art {
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namespace mirror {
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class Object;
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} // namespace mirror
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class Thread;
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// Counting locks by storing object pointers into a vector. Duplicate entries mark recursive locks.
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// The vector will be visited with the ShadowFrame during GC (so all the locked-on objects are
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// thread roots).
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// Note: implementation is split so that the call sites may be optimized to no-ops in case no
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// lock counting is necessary. The actual implementation is in the cc file to avoid
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// dependencies.
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class LockCountData {
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public:
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// Add the given object to the list of monitors, that is, objects that have been locked. This
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// will not throw (but be skipped if there is an exception pending on entry).
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void AddMonitor(Thread* self, mirror::Object* obj) REQUIRES_SHARED(Locks::mutator_lock_);
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// Try to remove the given object from the monitor list, indicating an unlock operation.
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// This will throw an IllegalMonitorStateException (clearing any already pending exception), in
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// case that there wasn't a lock recorded for the object.
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void RemoveMonitorOrThrow(Thread* self,
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const mirror::Object* obj) REQUIRES_SHARED(Locks::mutator_lock_);
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// Check whether all acquired monitors have been released. This will potentially throw an
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// IllegalMonitorStateException, clearing any already pending exception. Returns true if the
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// check shows that everything is OK wrt/ lock counting, false otherwise.
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bool CheckAllMonitorsReleasedOrThrow(Thread* self) REQUIRES_SHARED(Locks::mutator_lock_);
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template <typename T, typename... Args>
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void VisitMonitors(T visitor, Args&&... args) REQUIRES_SHARED(Locks::mutator_lock_) {
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if (monitors_ != nullptr) {
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// Visitors may change the Object*. Be careful with the foreach loop.
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for (mirror::Object*& obj : *monitors_) {
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visitor(/* inout */ &obj, std::forward<Args>(args)...);
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}
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}
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}
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private:
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// Stores references to the locked-on objects. As noted, this should be visited during thread
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// marking.
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std::unique_ptr<std::vector<mirror::Object*>> monitors_;
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};
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} // namespace art
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#endif // ART_RUNTIME_INTERPRETER_LOCK_COUNT_DATA_H_
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