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/*
* Copyright (C) 2014 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.
*/
#include "monitor_objects_stack_visitor.h"
#include "obj_ptr-inl.h"
#include "read_barrier-inl.h"
#include "thread-current-inl.h"
namespace art {
bool MonitorObjectsStackVisitor::VisitFrame() {
ArtMethod* m = GetMethod();
if (m->IsRuntimeMethod()) {
return true;
}
VisitMethodResult vmrEntry = StartMethod(m, frame_count);
switch (vmrEntry) {
case VisitMethodResult::kContinueMethod:
break;
case VisitMethodResult::kSkipMethod:
return true;
case VisitMethodResult::kEndStackWalk:
return false;
}
if (frame_count == 0) {
// Top frame, check for blocked state.
ObjPtr<mirror::Object> monitor_object;
uint32_t lock_owner_tid;
ThreadState state = Monitor::FetchState(GetThread(),
&monitor_object,
&lock_owner_tid);
switch (state) {
case ThreadState::kWaiting:
case ThreadState::kTimedWaiting:
VisitWaitingObject(monitor_object, state);
break;
case ThreadState::kSleeping:
VisitSleepingObject(monitor_object);
break;
case ThreadState::kBlocked:
case ThreadState::kWaitingForLockInflation:
VisitBlockedOnObject(monitor_object, state, lock_owner_tid);
break;
default:
break;
}
}
if (dump_locks) {
// Visit locks, but do not abort on errors. This could trigger a nested abort.
// Skip visiting locks if dump_locks is false as it would cause a bad_mutexes_held in
// RegTypeCache::RegTypeCache due to thread_list_lock.
Monitor::VisitLocks(this, VisitLockedObject, this, false);
}
++frame_count;
VisitMethodResult vmrExit = EndMethod(m);
switch (vmrExit) {
case VisitMethodResult::kContinueMethod:
case VisitMethodResult::kSkipMethod:
return true;
case VisitMethodResult::kEndStackWalk:
return false;
}
LOG(FATAL) << "Unreachable";
UNREACHABLE();
}
void MonitorObjectsStackVisitor::VisitLockedObject(ObjPtr<mirror::Object> o, void* context) {
MonitorObjectsStackVisitor* self = reinterpret_cast<MonitorObjectsStackVisitor*>(context);
if (o != nullptr) {
if (gUseReadBarrier && Thread::Current()->GetIsGcMarking()) {
// We may call Thread::Dump() in the middle of the CC thread flip and this thread's stack
// may have not been flipped yet and "o" may be a from-space (stale) ref, in which case the
// IdentityHashCode call below will crash. So explicitly mark/forward it here.
o = ReadBarrier::Mark(o.Ptr());
}
}
self->VisitLockedObject(o);
}
} // namespace art