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_EXPERIMENTAL_FLAGS_H_
18 #define ART_RUNTIME_EXPERIMENTAL_FLAGS_H_
19 
20 #include <ostream>
21 
22 #include "base/casts.h"
23 #include "base/macros.h"
24 
25 namespace art HIDDEN {
26 
27 // Possible experimental features that might be enabled.
28 enum class ExperimentalFlags : uint32_t {
29   kNone           = 0x0000,
30   kMethodHandles  = 0x0004,  // 0b00000100
31 };
32 
33 constexpr ExperimentalFlags operator|(ExperimentalFlags a, ExperimentalFlags b) {
34   return enum_cast<ExperimentalFlags>(enum_cast(a) | enum_cast(b));
35 }
36 
37 constexpr ExperimentalFlags operator&(ExperimentalFlags a, ExperimentalFlags b) {
38   return enum_cast<ExperimentalFlags>(enum_cast(a) & enum_cast(b));
39 }
40 
41 inline std::ostream& operator<<(std::ostream& stream, ExperimentalFlags e) {
42   bool started = false;
43   if ((e & ExperimentalFlags::kMethodHandles) != ExperimentalFlags::kNone) {
44     stream << (started ? "|" : "") << "kMethodHandles";
45     started = true;
46   }
47   if (!started) {
48     stream << "kNone";
49   }
50   return stream;
51 }
52 
53 }  // namespace art
54 
55 #endif  // ART_RUNTIME_EXPERIMENTAL_FLAGS_H_
56