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104 lines
3.1 KiB
104 lines
3.1 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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#include "monitor_objects_stack_visitor.h"
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#include "obj_ptr-inl.h"
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#include "read_barrier-inl.h"
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#include "thread-current-inl.h"
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namespace art {
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bool MonitorObjectsStackVisitor::VisitFrame() {
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ArtMethod* m = GetMethod();
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if (m->IsRuntimeMethod()) {
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return true;
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}
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VisitMethodResult vmrEntry = StartMethod(m, frame_count);
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switch (vmrEntry) {
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case VisitMethodResult::kContinueMethod:
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break;
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case VisitMethodResult::kSkipMethod:
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return true;
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case VisitMethodResult::kEndStackWalk:
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return false;
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}
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if (frame_count == 0) {
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// Top frame, check for blocked state.
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ObjPtr<mirror::Object> monitor_object;
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uint32_t lock_owner_tid;
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ThreadState state = Monitor::FetchState(GetThread(),
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&monitor_object,
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&lock_owner_tid);
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switch (state) {
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case kWaiting:
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case kTimedWaiting:
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VisitWaitingObject(monitor_object, state);
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break;
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case kSleeping:
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VisitSleepingObject(monitor_object);
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break;
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case kBlocked:
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case kWaitingForLockInflation:
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VisitBlockedOnObject(monitor_object, state, lock_owner_tid);
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break;
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default:
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break;
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}
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}
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if (dump_locks) {
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// Visit locks, but do not abort on errors. This could trigger a nested abort.
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// Skip visiting locks if dump_locks is false as it would cause a bad_mutexes_held in
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// RegTypeCache::RegTypeCache due to thread_list_lock.
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Monitor::VisitLocks(this, VisitLockedObject, this, false);
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}
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++frame_count;
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VisitMethodResult vmrExit = EndMethod(m);
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switch (vmrExit) {
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case VisitMethodResult::kContinueMethod:
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case VisitMethodResult::kSkipMethod:
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return true;
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case VisitMethodResult::kEndStackWalk:
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return false;
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}
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LOG(FATAL) << "Unreachable";
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UNREACHABLE();
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}
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void MonitorObjectsStackVisitor::VisitLockedObject(ObjPtr<mirror::Object> o, void* context) {
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MonitorObjectsStackVisitor* self = reinterpret_cast<MonitorObjectsStackVisitor*>(context);
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if (o != nullptr) {
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if (kUseReadBarrier && Thread::Current()->GetIsGcMarking()) {
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// We may call Thread::Dump() in the middle of the CC thread flip and this thread's stack
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// may have not been flipped yet and "o" may be a from-space (stale) ref, in which case the
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// IdentityHashCode call below will crash. So explicitly mark/forward it here.
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o = ReadBarrier::Mark(o.Ptr());
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}
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}
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self->VisitLockedObject(o);
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}
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} // namespace art
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