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_X86_MANAGED_REGISTER_X86_H_ 18 #define ART_COMPILER_UTILS_X86_MANAGED_REGISTER_X86_H_ 19 20 #include "constants_x86.h" 21 #include "utils/managed_register.h" 22 23 namespace art { 24 namespace x86 { 25 26 // Values for register pairs. 27 // The registers in kReservedCpuRegistersArray in x86.cc are not used in pairs. 28 // The table kRegisterPairs in x86.cc must be kept in sync with this enum. 29 enum RegisterPair { 30 EAX_EDX = 0, 31 EAX_ECX = 1, 32 EAX_EBX = 2, 33 EAX_EDI = 3, 34 EDX_ECX = 4, 35 EDX_EBX = 5, 36 EDX_EDI = 6, 37 ECX_EBX = 7, 38 ECX_EDI = 8, 39 EBX_EDI = 9, 40 ECX_EDX = 10, // Dalvik style passing 41 kNumberOfRegisterPairs = 11, 42 kNoRegisterPair = -1, 43 }; 44 45 std::ostream& operator<<(std::ostream& os, const RegisterPair& reg); 46 47 const int kNumberOfCpuRegIds = kNumberOfCpuRegisters; 48 const int kNumberOfCpuAllocIds = kNumberOfCpuRegisters; 49 50 const int kNumberOfXmmRegIds = kNumberOfXmmRegisters; 51 const int kNumberOfXmmAllocIds = kNumberOfXmmRegisters; 52 53 const int kNumberOfX87RegIds = kNumberOfX87Registers; 54 const int kNumberOfX87AllocIds = kNumberOfX87Registers; 55 56 const int kNumberOfPairRegIds = kNumberOfRegisterPairs; 57 58 const int kNumberOfRegIds = kNumberOfCpuRegIds + kNumberOfXmmRegIds + 59 kNumberOfX87RegIds + kNumberOfPairRegIds; 60 const int kNumberOfAllocIds = kNumberOfCpuAllocIds + kNumberOfXmmAllocIds + 61 kNumberOfX87RegIds; 62 63 // Register ids map: 64 // [0..R[ cpu registers (enum Register) 65 // [R..X[ xmm registers (enum XmmRegister) 66 // [X..S[ x87 registers (enum X87Register) 67 // [S..P[ register pairs (enum RegisterPair) 68 // where 69 // R = kNumberOfCpuRegIds 70 // X = R + kNumberOfXmmRegIds 71 // S = X + kNumberOfX87RegIds 72 // P = X + kNumberOfRegisterPairs 73 74 // Allocation ids map: 75 // [0..R[ cpu registers (enum Register) 76 // [R..X[ xmm registers (enum XmmRegister) 77 // [X..S[ x87 registers (enum X87Register) 78 // where 79 // R = kNumberOfCpuRegIds 80 // X = R + kNumberOfXmmRegIds 81 // S = X + kNumberOfX87RegIds 82 83 84 // An instance of class 'ManagedRegister' represents a single cpu register (enum 85 // Register), an xmm register (enum XmmRegister), or a pair of cpu registers 86 // (enum RegisterPair). 87 // 'ManagedRegister::NoRegister()' provides an invalid register. 88 // There is a one-to-one mapping between ManagedRegister and register id. 89 class X86ManagedRegister : public ManagedRegister { 90 public: 91 ByteRegister AsByteRegister() const { 92 CHECK(IsCpuRegister()); 93 CHECK_LT(AsCpuRegister(), ESP); // ESP, EBP, ESI and EDI cannot be encoded as byte registers. 94 return static_cast<ByteRegister>(id_); 95 } 96 97 Register AsCpuRegister() const { 98 CHECK(IsCpuRegister()); 99 return static_cast<Register>(id_); 100 } 101 102 XmmRegister AsXmmRegister() const { 103 CHECK(IsXmmRegister()); 104 return static_cast<XmmRegister>(id_ - kNumberOfCpuRegIds); 105 } 106 107 X87Register AsX87Register() const { 108 CHECK(IsX87Register()); 109 return static_cast<X87Register>(id_ - 110 (kNumberOfCpuRegIds + kNumberOfXmmRegIds)); 111 } 112 113 Register AsRegisterPairLow() const { 114 CHECK(IsRegisterPair()); 115 // Appropriate mapping of register ids allows to use AllocIdLow(). 116 return FromRegId(AllocIdLow()).AsCpuRegister(); 117 } 118 119 Register AsRegisterPairHigh() const { 120 CHECK(IsRegisterPair()); 121 // Appropriate mapping of register ids allows to use AllocIdHigh(). 122 return FromRegId(AllocIdHigh()).AsCpuRegister(); 123 } 124 125 RegisterPair AsRegisterPair() const { 126 CHECK(IsRegisterPair()); 127 return static_cast<RegisterPair>(id_ - 128 (kNumberOfCpuRegIds + kNumberOfXmmRegIds + kNumberOfX87RegIds)); 129 } 130 131 bool IsCpuRegister() const { 132 CHECK(IsValidManagedRegister()); 133 return (0 <= id_) && (id_ < kNumberOfCpuRegIds); 134 } 135 136 bool IsXmmRegister() const { 137 CHECK(IsValidManagedRegister()); 138 const int test = id_ - kNumberOfCpuRegIds; 139 return (0 <= test) && (test < kNumberOfXmmRegIds); 140 } 141 142 bool IsX87Register() const { 143 CHECK(IsValidManagedRegister()); 144 const int test = id_ - (kNumberOfCpuRegIds + kNumberOfXmmRegIds); 145 return (0 <= test) && (test < kNumberOfX87RegIds); 146 } 147 148 bool IsRegisterPair() const { 149 CHECK(IsValidManagedRegister()); 150 const int test = id_ - 151 (kNumberOfCpuRegIds + kNumberOfXmmRegIds + kNumberOfX87RegIds); 152 return (0 <= test) && (test < kNumberOfPairRegIds); 153 } 154 155 void Print(std::ostream& os) const; 156 157 // Returns true if the two managed-registers ('this' and 'other') overlap. 158 // Either managed-register may be the NoRegister. If both are the NoRegister 159 // then false is returned. 160 bool Overlaps(const X86ManagedRegister& other) const; 161 162 static X86ManagedRegister FromCpuRegister(Register r) { 163 CHECK_NE(r, kNoRegister); 164 return FromRegId(r); 165 } 166 167 static X86ManagedRegister FromXmmRegister(XmmRegister r) { 168 CHECK_NE(r, kNoXmmRegister); 169 return FromRegId(r + kNumberOfCpuRegIds); 170 } 171 172 static X86ManagedRegister FromX87Register(X87Register r) { 173 CHECK_NE(r, kNoX87Register); 174 return FromRegId(r + kNumberOfCpuRegIds + kNumberOfXmmRegIds); 175 } 176 177 static X86ManagedRegister FromRegisterPair(RegisterPair r) { 178 CHECK_NE(r, kNoRegisterPair); 179 return FromRegId(r + (kNumberOfCpuRegIds + kNumberOfXmmRegIds + 180 kNumberOfX87RegIds)); 181 } 182 183 private: 184 bool IsValidManagedRegister() const { 185 return (0 <= id_) && (id_ < kNumberOfRegIds); 186 } 187 188 int RegId() const { 189 CHECK(!IsNoRegister()); 190 return id_; 191 } 192 193 int AllocId() const { 194 CHECK(IsValidManagedRegister() && !IsRegisterPair()); 195 CHECK_LT(id_, kNumberOfAllocIds); 196 return id_; 197 } 198 199 int AllocIdLow() const; 200 int AllocIdHigh() const; 201 202 friend class ManagedRegister; 203 204 explicit X86ManagedRegister(int reg_id) : ManagedRegister(reg_id) {} 205 206 static X86ManagedRegister FromRegId(int reg_id) { 207 X86ManagedRegister reg(reg_id); 208 CHECK(reg.IsValidManagedRegister()); 209 return reg; 210 } 211 }; 212 213 std::ostream& operator<<(std::ostream& os, const X86ManagedRegister& reg); 214 215 } // namespace x86 216 217 inline x86::X86ManagedRegister ManagedRegister::AsX86() const { 218 x86::X86ManagedRegister reg(id_); 219 CHECK(reg.IsNoRegister() || reg.IsValidManagedRegister()); 220 return reg; 221 } 222 223 } // namespace art 224 225 #endif // ART_COMPILER_UTILS_X86_MANAGED_REGISTER_X86_H_ 226
