1 /*
2  * Copyright (C) 2015 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 #ifndef ART_RUNTIME_GC_WEAK_ROOT_STATE_H_
18 #define ART_RUNTIME_GC_WEAK_ROOT_STATE_H_
19 
20 #include <iosfwd>
21 
22 #include "base/macros.h"
23 
24 namespace art HIDDEN {
25 namespace gc {
26 
27 enum WeakRootState {
28   // Can read or add weak roots.
29   kWeakRootStateNormal,
30   // Need to wait until we can read weak roots.
31   kWeakRootStateNoReadsOrWrites,
32   // Need to mark new weak roots to make sure they don't get swept.
33   // kWeakRootStateMarkNewRoots is currently unused but I was planning on using to allow adding new
34   // weak roots during the CMS reference processing phase.
35   kWeakRootStateMarkNewRoots,
36 };
37 
38 std::ostream& operator<<(std::ostream& os, WeakRootState weak_root_state);
39 
40 }  // namespace gc
41 }  // namespace art
42 
43 #endif  // ART_RUNTIME_GC_WEAK_ROOT_STATE_H_
44