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_x86.h"
18
19 #include "base/globals.h"
20
21 namespace art {
22 namespace x86 {
23
24 // Define register pairs.
25 // This list must be kept in sync with the RegisterPair enum.
26 #define REGISTER_PAIR_LIST(P) \
27 P(EAX, EDX) \
28 P(EAX, ECX) \
29 P(EAX, EBX) \
30 P(EAX, EDI) \
31 P(EDX, ECX) \
32 P(EDX, EBX) \
33 P(EDX, EDI) \
34 P(ECX, EBX) \
35 P(ECX, EDI) \
36 P(EBX, EDI) \
37 P(ECX, EDX)
38
39
40 struct RegisterPairDescriptor {
41 RegisterPair reg; // Used to verify that the enum is in sync.
42 Register low;
43 Register high;
44 };
45
46
47 static const RegisterPairDescriptor kRegisterPairs[] = {
48 #define REGISTER_PAIR_ENUMERATION(low, high) { low##_##high, low, high },
49 REGISTER_PAIR_LIST(REGISTER_PAIR_ENUMERATION)
50 #undef REGISTER_PAIR_ENUMERATION
51 };
52
operator <<(std::ostream & os,const RegisterPair & reg)53 std::ostream& operator<<(std::ostream& os, const RegisterPair& reg) {
54 if (reg == kNoRegisterPair) {
55 os << "kNoRegisterPair";
56 } else {
57 os << X86ManagedRegister::FromRegisterPair(reg);
58 }
59 return os;
60 }
61
Overlaps(const X86ManagedRegister & other) const62 bool X86ManagedRegister::Overlaps(const X86ManagedRegister& other) const {
63 if (IsNoRegister() || other.IsNoRegister()) return false;
64 CHECK(IsValidManagedRegister());
65 CHECK(other.IsValidManagedRegister());
66 if (Equals(other)) return true;
67 if (IsRegisterPair()) {
68 Register low = AsRegisterPairLow();
69 Register high = AsRegisterPairHigh();
70 return X86ManagedRegister::FromCpuRegister(low).Overlaps(other) ||
71 X86ManagedRegister::FromCpuRegister(high).Overlaps(other);
72 }
73 if (other.IsRegisterPair()) {
74 return other.Overlaps(*this);
75 }
76 return false;
77 }
78
79
AllocIdLow() const80 int X86ManagedRegister::AllocIdLow() const {
81 CHECK(IsRegisterPair());
82 const int r = RegId() - (kNumberOfCpuRegIds + kNumberOfXmmRegIds +
83 kNumberOfX87RegIds);
84 CHECK_EQ(r, kRegisterPairs[r].reg);
85 return kRegisterPairs[r].low;
86 }
87
88
AllocIdHigh() const89 int X86ManagedRegister::AllocIdHigh() const {
90 CHECK(IsRegisterPair());
91 const int r = RegId() - (kNumberOfCpuRegIds + kNumberOfXmmRegIds +
92 kNumberOfX87RegIds);
93 CHECK_EQ(r, kRegisterPairs[r].reg);
94 return kRegisterPairs[r].high;
95 }
96
97
Print(std::ostream & os) const98 void X86ManagedRegister::Print(std::ostream& os) const {
99 if (!IsValidManagedRegister()) {
100 os << "No Register";
101 } else if (IsXmmRegister()) {
102 os << "XMM: " << AsXmmRegister();
103 } else if (IsX87Register()) {
104 os << "X87: " << AsX87Register();
105 } else if (IsCpuRegister()) {
106 os << "CPU: " << AsCpuRegister();
107 } else if (IsRegisterPair()) {
108 os << "Pair: " << AsRegisterPairLow() << ", " << AsRegisterPairHigh();
109 } else {
110 os << "??: " << RegId();
111 }
112 }
113
operator <<(std::ostream & os,const X86ManagedRegister & reg)114 std::ostream& operator<<(std::ostream& os, const X86ManagedRegister& reg) {
115 reg.Print(os);
116 return os;
117 }
118
119 } // namespace x86
120 } // namespace art
121