1 /* 2 * Copyright (C) 2014 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_64_MANAGED_REGISTER_X86_64_H_ 18 #define ART_COMPILER_UTILS_X86_64_MANAGED_REGISTER_X86_64_H_ 19 20 #include "constants_x86_64.h" 21 #include "utils/managed_register.h" 22 23 namespace art { 24 namespace x86_64 { 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 RAX_RDX = 0, 31 RAX_RCX = 1, 32 RAX_RBX = 2, 33 RAX_RDI = 3, 34 RDX_RCX = 4, 35 RDX_RBX = 5, 36 RDX_RDI = 6, 37 RCX_RBX = 7, 38 RCX_RDI = 8, 39 RBX_RDI = 9, 40 kNumberOfRegisterPairs = 10, 41 kNoRegisterPair = -1, 42 }; 43 44 std::ostream& operator<<(std::ostream& os, const RegisterPair& reg); 45 46 const int kNumberOfCpuRegIds = kNumberOfCpuRegisters; 47 const int kNumberOfCpuAllocIds = kNumberOfCpuRegisters; 48 49 const int kNumberOfXmmRegIds = kNumberOfFloatRegisters; 50 const int kNumberOfXmmAllocIds = kNumberOfFloatRegisters; 51 52 const int kNumberOfX87RegIds = kNumberOfX87Registers; 53 const int kNumberOfX87AllocIds = kNumberOfX87Registers; 54 55 const int kNumberOfPairRegIds = kNumberOfRegisterPairs; 56 57 const int kNumberOfRegIds = kNumberOfCpuRegIds + kNumberOfXmmRegIds + 58 kNumberOfX87RegIds + kNumberOfPairRegIds; 59 const int kNumberOfAllocIds = kNumberOfCpuAllocIds + kNumberOfXmmAllocIds + 60 kNumberOfX87RegIds; 61 62 // Register ids map: 63 // [0..R[ cpu registers (enum Register) 64 // [R..X[ xmm registers (enum XmmRegister) 65 // [X..S[ x87 registers (enum X87Register) 66 // [S..P[ register pairs (enum RegisterPair) 67 // where 68 // R = kNumberOfCpuRegIds 69 // X = R + kNumberOfXmmRegIds 70 // S = X + kNumberOfX87RegIds 71 // P = X + kNumberOfRegisterPairs 72 73 // Allocation ids map: 74 // [0..R[ cpu registers (enum Register) 75 // [R..X[ xmm registers (enum XmmRegister) 76 // [X..S[ x87 registers (enum X87Register) 77 // where 78 // R = kNumberOfCpuRegIds 79 // X = R + kNumberOfXmmRegIds 80 // S = X + kNumberOfX87RegIds 81 82 83 // An instance of class 'ManagedRegister' represents a single cpu register (enum 84 // Register), an xmm register (enum XmmRegister), or a pair of cpu registers 85 // (enum RegisterPair). 86 // 'ManagedRegister::NoRegister()' provides an invalid register. 87 // There is a one-to-one mapping between ManagedRegister and register id. 88 class X86_64ManagedRegister : public ManagedRegister { 89 public: 90 CpuRegister AsCpuRegister() const { 91 CHECK(IsCpuRegister()); 92 return CpuRegister(static_cast<Register>(id_)); 93 } 94 95 XmmRegister AsXmmRegister() const { 96 CHECK(IsXmmRegister()); 97 return XmmRegister(static_cast<FloatRegister>(id_ - kNumberOfCpuRegIds)); 98 } 99 100 X87Register AsX87Register() const { 101 CHECK(IsX87Register()); 102 return static_cast<X87Register>(id_ - 103 (kNumberOfCpuRegIds + kNumberOfXmmRegIds)); 104 } 105 106 CpuRegister AsRegisterPairLow() const { 107 CHECK(IsRegisterPair()); 108 // Appropriate mapping of register ids allows to use AllocIdLow(). 109 return FromRegId(AllocIdLow()).AsCpuRegister(); 110 } 111 112 CpuRegister AsRegisterPairHigh() const { 113 CHECK(IsRegisterPair()); 114 // Appropriate mapping of register ids allows to use AllocIdHigh(). 115 return FromRegId(AllocIdHigh()).AsCpuRegister(); 116 } 117 118 bool IsCpuRegister() const { 119 CHECK(IsValidManagedRegister()); 120 return (0 <= id_) && (id_ < kNumberOfCpuRegIds); 121 } 122 123 bool IsXmmRegister() const { 124 CHECK(IsValidManagedRegister()); 125 const int test = id_ - kNumberOfCpuRegIds; 126 return (0 <= test) && (test < kNumberOfXmmRegIds); 127 } 128 129 bool IsX87Register() const { 130 CHECK(IsValidManagedRegister()); 131 const int test = id_ - (kNumberOfCpuRegIds + kNumberOfXmmRegIds); 132 return (0 <= test) && (test < kNumberOfX87RegIds); 133 } 134 135 bool IsRegisterPair() const { 136 CHECK(IsValidManagedRegister()); 137 const int test = id_ - 138 (kNumberOfCpuRegIds + kNumberOfXmmRegIds + kNumberOfX87RegIds); 139 return (0 <= test) && (test < kNumberOfPairRegIds); 140 } 141 142 void Print(std::ostream& os) const; 143 144 // Returns true if the two managed-registers ('this' and 'other') overlap. 145 // Either managed-register may be the NoRegister. If both are the NoRegister 146 // then false is returned. 147 bool Overlaps(const X86_64ManagedRegister& other) const; 148 149 static X86_64ManagedRegister FromCpuRegister(Register r) { 150 CHECK_NE(r, kNoRegister); 151 return FromRegId(r); 152 } 153 154 static X86_64ManagedRegister FromXmmRegister(FloatRegister r) { 155 return FromRegId(r + kNumberOfCpuRegIds); 156 } 157 158 static X86_64ManagedRegister FromX87Register(X87Register r) { 159 CHECK_NE(r, kNoX87Register); 160 return FromRegId(r + kNumberOfCpuRegIds + kNumberOfXmmRegIds); 161 } 162 163 static X86_64ManagedRegister FromRegisterPair(RegisterPair r) { 164 CHECK_NE(r, kNoRegisterPair); 165 return FromRegId(r + (kNumberOfCpuRegIds + kNumberOfXmmRegIds + 166 kNumberOfX87RegIds)); 167 } 168 169 private: 170 bool IsValidManagedRegister() const { 171 return (0 <= id_) && (id_ < kNumberOfRegIds); 172 } 173 174 int RegId() const { 175 CHECK(!IsNoRegister()); 176 return id_; 177 } 178 179 int AllocId() const { 180 CHECK(IsValidManagedRegister() && !IsRegisterPair()); 181 CHECK_LT(id_, kNumberOfAllocIds); 182 return id_; 183 } 184 185 int AllocIdLow() const; 186 int AllocIdHigh() const; 187 188 friend class ManagedRegister; 189 190 explicit X86_64ManagedRegister(int reg_id) : ManagedRegister(reg_id) {} 191 192 static X86_64ManagedRegister FromRegId(int reg_id) { 193 X86_64ManagedRegister reg(reg_id); 194 CHECK(reg.IsValidManagedRegister()); 195 return reg; 196 } 197 }; 198 199 std::ostream& operator<<(std::ostream& os, const X86_64ManagedRegister& reg); 200 201 } // namespace x86_64 202 203 inline x86_64::X86_64ManagedRegister ManagedRegister::AsX86_64() const { 204 x86_64::X86_64ManagedRegister reg(id_); 205 CHECK(reg.IsNoRegister() || reg.IsValidManagedRegister()); 206 return reg; 207 } 208 209 } // namespace art 210 211 #endif // ART_COMPILER_UTILS_X86_64_MANAGED_REGISTER_X86_64_H_ 212
