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 "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 os << X86ManagedRegister::FromRegisterPair(reg);
55 return os;
56 }
57
Overlaps(const X86ManagedRegister & other) const58 bool X86ManagedRegister::Overlaps(const X86ManagedRegister& other) const {
59 if (IsNoRegister() || other.IsNoRegister()) return false;
60 CHECK(IsValidManagedRegister());
61 CHECK(other.IsValidManagedRegister());
62 if (Equals(other)) return true;
63 if (IsRegisterPair()) {
64 Register low = AsRegisterPairLow();
65 Register high = AsRegisterPairHigh();
66 return X86ManagedRegister::FromCpuRegister(low).Overlaps(other) ||
67 X86ManagedRegister::FromCpuRegister(high).Overlaps(other);
68 }
69 if (other.IsRegisterPair()) {
70 return other.Overlaps(*this);
71 }
72 return false;
73 }
74
75
AllocIdLow() const76 int X86ManagedRegister::AllocIdLow() const {
77 CHECK(IsRegisterPair());
78 const int r = RegId() - (kNumberOfCpuRegIds + kNumberOfXmmRegIds +
79 kNumberOfX87RegIds);
80 CHECK_EQ(r, kRegisterPairs[r].reg);
81 return kRegisterPairs[r].low;
82 }
83
84
AllocIdHigh() const85 int X86ManagedRegister::AllocIdHigh() const {
86 CHECK(IsRegisterPair());
87 const int r = RegId() - (kNumberOfCpuRegIds + kNumberOfXmmRegIds +
88 kNumberOfX87RegIds);
89 CHECK_EQ(r, kRegisterPairs[r].reg);
90 return kRegisterPairs[r].high;
91 }
92
93
Print(std::ostream & os) const94 void X86ManagedRegister::Print(std::ostream& os) const {
95 if (!IsValidManagedRegister()) {
96 os << "No Register";
97 } else if (IsXmmRegister()) {
98 os << "XMM: " << AsXmmRegister();
99 } else if (IsX87Register()) {
100 os << "X87: " << AsX87Register();
101 } else if (IsCpuRegister()) {
102 os << "CPU: " << AsCpuRegister();
103 } else if (IsRegisterPair()) {
104 os << "Pair: " << AsRegisterPairLow() << ", " << AsRegisterPairHigh();
105 } else {
106 os << "??: " << RegId();
107 }
108 }
109
operator <<(std::ostream & os,const X86ManagedRegister & reg)110 std::ostream& operator<<(std::ostream& os, const X86ManagedRegister& reg) {
111 reg.Print(os);
112 return os;
113 }
114
115 } // namespace x86
116 } // namespace art
117