/*
|
* 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 kWaiting:
|
case kTimedWaiting:
|
VisitWaitingObject(monitor_object, state);
|
break;
|
case kSleeping:
|
VisitSleepingObject(monitor_object);
|
break;
|
|
case kBlocked:
|
case 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 (kUseReadBarrier && 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
|
