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119 lines
5.0 KiB
119 lines
5.0 KiB
/*
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* Copyright (C) 2014 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_GC_REFERENCE_PROCESSOR_H_
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#define ART_RUNTIME_GC_REFERENCE_PROCESSOR_H_
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#include "base/locks.h"
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#include "jni.h"
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#include "reference_queue.h"
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#include "runtime_globals.h"
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namespace art {
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class IsMarkedVisitor;
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class TimingLogger;
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namespace mirror {
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class Class;
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class FinalizerReference;
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class Object;
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class Reference;
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} // namespace mirror
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namespace gc {
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namespace collector {
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class GarbageCollector;
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} // namespace collector
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class Heap;
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// Used to process java.lang.ref.Reference instances concurrently or paused.
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class ReferenceProcessor {
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public:
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ReferenceProcessor();
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void ProcessReferences(bool concurrent,
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TimingLogger* timings,
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bool clear_soft_references,
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gc::collector::GarbageCollector* collector)
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REQUIRES_SHARED(Locks::mutator_lock_)
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REQUIRES(Locks::heap_bitmap_lock_)
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REQUIRES(!Locks::reference_processor_lock_);
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// The slow path bool is contained in the reference class object, can only be set once
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// Only allow setting this with mutators suspended so that we can avoid using a lock in the
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// GetReferent fast path as an optimization.
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void EnableSlowPath() REQUIRES_SHARED(Locks::mutator_lock_);
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void BroadcastForSlowPath(Thread* self);
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// Decode the referent, may block if references are being processed.
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ObjPtr<mirror::Object> GetReferent(Thread* self, ObjPtr<mirror::Reference> reference)
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REQUIRES_SHARED(Locks::mutator_lock_) REQUIRES(!Locks::reference_processor_lock_);
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// Collects the cleared references and returns a task, to be executed after FinishGC, that will
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// enqueue all of them.
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SelfDeletingTask* CollectClearedReferences(Thread* self) REQUIRES(!Locks::mutator_lock_);
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void DelayReferenceReferent(ObjPtr<mirror::Class> klass,
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ObjPtr<mirror::Reference> ref,
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collector::GarbageCollector* collector)
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REQUIRES_SHARED(Locks::mutator_lock_);
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void UpdateRoots(IsMarkedVisitor* visitor)
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REQUIRES_SHARED(Locks::mutator_lock_, Locks::heap_bitmap_lock_);
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// Make a circular list with reference if it is not enqueued. Uses the finalizer queue lock.
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bool MakeCircularListIfUnenqueued(ObjPtr<mirror::FinalizerReference> reference)
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REQUIRES_SHARED(Locks::mutator_lock_)
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REQUIRES(!Locks::reference_processor_lock_,
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!Locks::reference_queue_finalizer_references_lock_);
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void ClearReferent(ObjPtr<mirror::Reference> ref)
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REQUIRES_SHARED(Locks::mutator_lock_)
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REQUIRES(!Locks::reference_processor_lock_);
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private:
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bool SlowPathEnabled() REQUIRES_SHARED(Locks::mutator_lock_);
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// Called by ProcessReferences.
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void DisableSlowPath(Thread* self) REQUIRES(Locks::reference_processor_lock_)
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REQUIRES_SHARED(Locks::mutator_lock_);
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// If we are preserving references it means that some dead objects may become live, we use start
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// and stop preserving to block mutators using GetReferrent from getting access to these
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// referents.
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void StartPreservingReferences(Thread* self) REQUIRES(!Locks::reference_processor_lock_);
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void StopPreservingReferences(Thread* self) REQUIRES(!Locks::reference_processor_lock_);
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// Wait until reference processing is done.
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void WaitUntilDoneProcessingReferences(Thread* self)
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REQUIRES_SHARED(Locks::mutator_lock_)
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REQUIRES(Locks::reference_processor_lock_);
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// Collector which is clearing references, used by the GetReferent to return referents which are
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// already marked.
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collector::GarbageCollector* collector_ GUARDED_BY(Locks::reference_processor_lock_);
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// Boolean for whether or not we are preserving references (either soft references or finalizers).
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// If this is true, then we cannot return a referent (see comment in GetReferent).
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bool preserving_references_ GUARDED_BY(Locks::reference_processor_lock_);
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// Condition that people wait on if they attempt to get the referent of a reference while
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// processing is in progress.
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ConditionVariable condition_ GUARDED_BY(Locks::reference_processor_lock_);
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// Reference queues used by the GC.
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ReferenceQueue soft_reference_queue_;
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ReferenceQueue weak_reference_queue_;
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ReferenceQueue finalizer_reference_queue_;
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ReferenceQueue phantom_reference_queue_;
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ReferenceQueue cleared_references_;
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DISALLOW_COPY_AND_ASSIGN(ReferenceProcessor);
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};
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} // namespace gc
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} // namespace art
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#endif // ART_RUNTIME_GC_REFERENCE_PROCESSOR_H_
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