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#include "managed_register_arm.h"
18
19#include "globals.h"
20
21namespace art {
22namespace arm {
23
24// Returns true if this managed-register overlaps the other managed-register.
25bool ArmManagedRegister::Overlaps(const ArmManagedRegister& other) const {
26  if (IsNoRegister() || other.IsNoRegister()) return false;
27  if (Equals(other)) return true;
28  if (IsRegisterPair()) {
29    Register low = AsRegisterPairLow();
30    Register high = AsRegisterPairHigh();
31    return ArmManagedRegister::FromCoreRegister(low).Overlaps(other) ||
32        ArmManagedRegister::FromCoreRegister(high).Overlaps(other);
33  }
34  if (IsOverlappingDRegister()) {
35    if (other.IsDRegister()) return Equals(other);
36    if (other.IsSRegister()) {
37      SRegister low = AsOverlappingDRegisterLow();
38      SRegister high = AsOverlappingDRegisterHigh();
39      SRegister other_sreg = other.AsSRegister();
40      return (low == other_sreg) || (high == other_sreg);
41    }
42    return false;
43  }
44  if (other.IsRegisterPair() || other.IsOverlappingDRegister()) {
45    return other.Overlaps(*this);
46  }
47  return false;
48}
49
50
51int ArmManagedRegister::AllocIdLow() const {
52  CHECK(IsOverlappingDRegister() || IsRegisterPair());
53  const int r = RegId() - (kNumberOfCoreRegIds + kNumberOfSRegIds);
54  int low;
55  if (r < kNumberOfOverlappingDRegIds) {
56    CHECK(IsOverlappingDRegister());
57    low = (r * 2) + kNumberOfCoreRegIds;  // Return a SRegister.
58  } else {
59    CHECK(IsRegisterPair());
60    low = (r - kNumberOfDRegIds) * 2;  // Return a Register.
61    if (low > 6) {
62      // we didn't got a pair higher than R6_R7, must be the dalvik special case
63      low = 1;
64    }
65  }
66  return low;
67}
68
69
70int ArmManagedRegister::AllocIdHigh() const {
71  return AllocIdLow() + 1;
72}
73
74
75void ArmManagedRegister::Print(std::ostream& os) const {
76  if (!IsValidManagedRegister()) {
77    os << "No Register";
78  } else if (IsCoreRegister()) {
79    os << "Core: " << static_cast<int>(AsCoreRegister());
80  } else if (IsRegisterPair()) {
81    os << "Pair: " << static_cast<int>(AsRegisterPairLow()) << ", "
82       << static_cast<int>(AsRegisterPairHigh());
83  } else if (IsSRegister()) {
84    os << "SRegister: " << static_cast<int>(AsSRegister());
85  } else if (IsDRegister()) {
86    os << "DRegister: " << static_cast<int>(AsDRegister());
87  } else {
88    os << "??: " << RegId();
89  }
90}
91
92std::ostream& operator<<(std::ostream& os, const ArmManagedRegister& reg) {
93  reg.Print(os);
94  return os;
95}
96
97std::ostream& operator<<(std::ostream& os, const RegisterPair& r) {
98  os << ArmManagedRegister::FromRegisterPair(r);
99  return os;
100}
101
102}  // namespace arm
103}  // namespace art
104