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112 lines
3.8 KiB
112 lines
3.8 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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#include "lock_count_data.h"
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#include <algorithm>
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#include <string>
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#include "android-base/logging.h"
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#include "mirror/object-inl.h"
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#include "thread.h"
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namespace art {
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void LockCountData::AddMonitor(Thread* self, mirror::Object* obj) {
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if (obj == nullptr) {
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return;
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}
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// If there's an error during enter, we won't have locked the monitor. So check there's no
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// exception.
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if (self->IsExceptionPending()) {
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return;
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}
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if (monitors_ == nullptr) {
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monitors_.reset(new std::vector<mirror::Object*>());
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}
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monitors_->push_back(obj);
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}
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void LockCountData::RemoveMonitorOrThrow(Thread* self, const mirror::Object* obj) {
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if (obj == nullptr) {
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return;
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}
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bool found_object = false;
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if (monitors_ != nullptr) {
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// We need to remove one pointer to ref, as duplicates are used for counting recursive locks.
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// We arbitrarily choose the first one.
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auto it = std::find(monitors_->begin(), monitors_->end(), obj);
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if (it != monitors_->end()) {
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monitors_->erase(it);
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found_object = true;
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}
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}
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if (!found_object) {
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// The object wasn't found. Time for an IllegalMonitorStateException.
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// The order here isn't fully clear. Assume that any other pending exception is swallowed.
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// TODO: Maybe make already pending exception a suppressed exception.
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self->ClearException();
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self->ThrowNewExceptionF("Ljava/lang/IllegalMonitorStateException;",
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"did not lock monitor on object of type '%s' before unlocking",
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const_cast<mirror::Object*>(obj)->PrettyTypeOf().c_str());
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}
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}
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// Helper to unlock a monitor. Must be NO_THREAD_SAFETY_ANALYSIS, as we can't statically show
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// that the object was locked.
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void MonitorExitHelper(Thread* self, mirror::Object* obj) NO_THREAD_SAFETY_ANALYSIS {
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DCHECK(self != nullptr);
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DCHECK(obj != nullptr);
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obj->MonitorExit(self);
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}
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bool LockCountData::CheckAllMonitorsReleasedOrThrow(Thread* self) {
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DCHECK(self != nullptr);
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if (monitors_ != nullptr) {
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if (!monitors_->empty()) {
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// There may be an exception pending, if the method is terminating abruptly. Clear it.
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// TODO: Should we add this as a suppressed exception?
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self->ClearException();
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// OK, there are monitors that are still locked. To enforce structured locking (and avoid
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// deadlocks) we unlock all of them before we raise the IllegalMonitorState exception.
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for (mirror::Object* obj : *monitors_) {
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MonitorExitHelper(self, obj);
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// If this raised an exception, ignore. TODO: Should we add this as suppressed
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// exceptions?
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if (self->IsExceptionPending()) {
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self->ClearException();
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}
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}
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// Raise an exception, just give the first object as the sample.
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mirror::Object* first = (*monitors_)[0];
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self->ThrowNewExceptionF("Ljava/lang/IllegalMonitorStateException;",
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"did not unlock monitor on object of type '%s'",
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mirror::Object::PrettyTypeOf(first).c_str());
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// To make sure this path is not triggered again, clean out the monitors.
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monitors_->clear();
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return false;
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}
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}
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return true;
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}
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} // namespace art
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