1/*
2 * Copyright (C) 2011 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_COMPILER_UTILS_MANAGED_REGISTER_H_
18#define ART_COMPILER_UTILS_MANAGED_REGISTER_H_
19
20namespace art {
21
22namespace arm {
23class ArmManagedRegister;
24}
25namespace mips {
26class MipsManagedRegister;
27}
28namespace x86 {
29class X86ManagedRegister;
30}
31
32class ManagedRegister {
33 public:
34  // ManagedRegister is a value class. There exists no method to change the
35  // internal state. We therefore allow a copy constructor and an
36  // assignment-operator.
37  ManagedRegister(const ManagedRegister& other) : id_(other.id_) { }
38
39  ManagedRegister& operator=(const ManagedRegister& other) {
40    id_ = other.id_;
41    return *this;
42  }
43
44  arm::ArmManagedRegister AsArm() const;
45  mips::MipsManagedRegister AsMips() const;
46  x86::X86ManagedRegister AsX86() const;
47
48  // It is valid to invoke Equals on and with a NoRegister.
49  bool Equals(const ManagedRegister& other) const {
50    return id_ == other.id_;
51  }
52
53  bool IsNoRegister() const {
54    return id_ == kNoRegister;
55  }
56
57  static ManagedRegister NoRegister() {
58    return ManagedRegister();
59  }
60
61 protected:
62  static const int kNoRegister = -1;
63
64  ManagedRegister() : id_(kNoRegister) { }
65  explicit ManagedRegister(int reg_id) : id_(reg_id) { }
66
67  int id_;
68};
69
70}  // namespace art
71
72#endif  // ART_COMPILER_UTILS_MANAGED_REGISTER_H_
73