Elliott Hughes | 2faa5f1 | 2012-01-30 14:42:07 -0800 | [diff] [blame] | 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 | */ |
Ian Rogers | b033c75 | 2011-07-20 12:22:35 -0700 | [diff] [blame] | 16 | |
| 17 | #ifndef ART_SRC_MANAGED_REGISTER_ARM_H_ |
| 18 | #define ART_SRC_MANAGED_REGISTER_ARM_H_ |
| 19 | |
Brian Carlstrom | 578bbdc | 2011-07-21 14:07:47 -0700 | [diff] [blame] | 20 | #include "constants.h" |
| 21 | #include "logging.h" |
Ian Rogers | 2c8f653 | 2011-09-02 17:16:34 -0700 | [diff] [blame] | 22 | #include "managed_register.h" |
Ian Rogers | b033c75 | 2011-07-20 12:22:35 -0700 | [diff] [blame] | 23 | |
| 24 | namespace art { |
Ian Rogers | 2c8f653 | 2011-09-02 17:16:34 -0700 | [diff] [blame] | 25 | namespace arm { |
Ian Rogers | b033c75 | 2011-07-20 12:22:35 -0700 | [diff] [blame] | 26 | |
| 27 | // Values for register pairs. |
| 28 | enum RegisterPair { |
| 29 | R0_R1 = 0, |
| 30 | R2_R3 = 1, |
| 31 | R4_R5 = 2, |
| 32 | R6_R7 = 3, |
Ian Rogers | 7a99c11 | 2011-09-07 12:48:27 -0700 | [diff] [blame] | 33 | R1_R2 = 4, // Dalvik style passing |
| 34 | kNumberOfRegisterPairs = 5, |
Ian Rogers | b033c75 | 2011-07-20 12:22:35 -0700 | [diff] [blame] | 35 | kNoRegisterPair = -1, |
| 36 | }; |
| 37 | |
| 38 | std::ostream& operator<<(std::ostream& os, const RegisterPair& reg); |
| 39 | |
| 40 | const int kNumberOfCoreRegIds = kNumberOfCoreRegisters; |
| 41 | const int kNumberOfCoreAllocIds = kNumberOfCoreRegisters; |
| 42 | |
| 43 | const int kNumberOfSRegIds = kNumberOfSRegisters; |
| 44 | const int kNumberOfSAllocIds = kNumberOfSRegisters; |
| 45 | |
| 46 | const int kNumberOfDRegIds = kNumberOfDRegisters; |
| 47 | const int kNumberOfOverlappingDRegIds = kNumberOfOverlappingDRegisters; |
| 48 | const int kNumberOfDAllocIds = kNumberOfDRegIds - kNumberOfOverlappingDRegIds; |
| 49 | |
| 50 | const int kNumberOfPairRegIds = kNumberOfRegisterPairs; |
| 51 | |
| 52 | const int kNumberOfRegIds = kNumberOfCoreRegIds + kNumberOfSRegIds + |
| 53 | kNumberOfDRegIds + kNumberOfPairRegIds; |
| 54 | const int kNumberOfAllocIds = |
| 55 | kNumberOfCoreAllocIds + kNumberOfSAllocIds + kNumberOfDAllocIds; |
| 56 | |
| 57 | // Register ids map: |
| 58 | // [0..R[ core registers (enum Register) |
| 59 | // [R..S[ single precision VFP registers (enum SRegister) |
| 60 | // [S..D[ double precision VFP registers (enum DRegister) |
| 61 | // [D..P[ core register pairs (enum RegisterPair) |
| 62 | // where |
| 63 | // R = kNumberOfCoreRegIds |
| 64 | // S = R + kNumberOfSRegIds |
| 65 | // D = S + kNumberOfDRegIds |
| 66 | // P = D + kNumberOfRegisterPairs |
| 67 | |
| 68 | // Allocation ids map: |
| 69 | // [0..R[ core registers (enum Register) |
| 70 | // [R..S[ single precision VFP registers (enum SRegister) |
| 71 | // [S..N[ non-overlapping double precision VFP registers (16-31 in enum |
| 72 | // DRegister, VFPv3-D32 only) |
| 73 | // where |
| 74 | // R = kNumberOfCoreAllocIds |
| 75 | // S = R + kNumberOfSAllocIds |
| 76 | // N = S + kNumberOfDAllocIds |
| 77 | |
| 78 | |
| 79 | // An instance of class 'ManagedRegister' represents a single ARM register or a |
| 80 | // pair of core ARM registers (enum RegisterPair). A single register is either a |
| 81 | // core register (enum Register), a VFP single precision register |
| 82 | // (enum SRegister), or a VFP double precision register (enum DRegister). |
| 83 | // 'ManagedRegister::NoRegister()' returns an invalid ManagedRegister. |
| 84 | // There is a one-to-one mapping between ManagedRegister and register id. |
Ian Rogers | 2c8f653 | 2011-09-02 17:16:34 -0700 | [diff] [blame] | 85 | class ArmManagedRegister : public ManagedRegister { |
Ian Rogers | b033c75 | 2011-07-20 12:22:35 -0700 | [diff] [blame] | 86 | public: |
Ian Rogers | b033c75 | 2011-07-20 12:22:35 -0700 | [diff] [blame] | 87 | Register AsCoreRegister() const { |
| 88 | CHECK(IsCoreRegister()); |
| 89 | return static_cast<Register>(id_); |
| 90 | } |
| 91 | |
| 92 | SRegister AsSRegister() const { |
| 93 | CHECK(IsSRegister()); |
| 94 | return static_cast<SRegister>(id_ - kNumberOfCoreRegIds); |
| 95 | } |
| 96 | |
| 97 | DRegister AsDRegister() const { |
| 98 | CHECK(IsDRegister()); |
| 99 | return static_cast<DRegister>(id_ - kNumberOfCoreRegIds - kNumberOfSRegIds); |
| 100 | } |
| 101 | |
| 102 | SRegister AsOverlappingDRegisterLow() const { |
| 103 | CHECK(IsOverlappingDRegister()); |
| 104 | DRegister d_reg = AsDRegister(); |
| 105 | return static_cast<SRegister>(d_reg * 2); |
| 106 | } |
| 107 | |
| 108 | SRegister AsOverlappingDRegisterHigh() const { |
| 109 | CHECK(IsOverlappingDRegister()); |
| 110 | DRegister d_reg = AsDRegister(); |
| 111 | return static_cast<SRegister>(d_reg * 2 + 1); |
| 112 | } |
| 113 | |
| 114 | RegisterPair AsRegisterPair() const { |
| 115 | CHECK(IsRegisterPair()); |
| 116 | Register reg_low = AsRegisterPairLow(); |
Ian Rogers | 7a99c11 | 2011-09-07 12:48:27 -0700 | [diff] [blame] | 117 | if (reg_low == R1) { |
| 118 | return R1_R2; |
| 119 | } else { |
| 120 | return static_cast<RegisterPair>(reg_low / 2); |
| 121 | } |
Ian Rogers | b033c75 | 2011-07-20 12:22:35 -0700 | [diff] [blame] | 122 | } |
| 123 | |
| 124 | Register AsRegisterPairLow() const { |
| 125 | CHECK(IsRegisterPair()); |
| 126 | // Appropriate mapping of register ids allows to use AllocIdLow(). |
| 127 | return FromRegId(AllocIdLow()).AsCoreRegister(); |
| 128 | } |
| 129 | |
| 130 | Register AsRegisterPairHigh() const { |
| 131 | CHECK(IsRegisterPair()); |
| 132 | // Appropriate mapping of register ids allows to use AllocIdHigh(). |
| 133 | return FromRegId(AllocIdHigh()).AsCoreRegister(); |
| 134 | } |
| 135 | |
| 136 | bool IsCoreRegister() const { |
| 137 | CHECK(IsValidManagedRegister()); |
| 138 | return (0 <= id_) && (id_ < kNumberOfCoreRegIds); |
| 139 | } |
| 140 | |
| 141 | bool IsSRegister() const { |
| 142 | CHECK(IsValidManagedRegister()); |
| 143 | const int test = id_ - kNumberOfCoreRegIds; |
| 144 | return (0 <= test) && (test < kNumberOfSRegIds); |
| 145 | } |
| 146 | |
| 147 | bool IsDRegister() const { |
| 148 | CHECK(IsValidManagedRegister()); |
| 149 | const int test = id_ - (kNumberOfCoreRegIds + kNumberOfSRegIds); |
| 150 | return (0 <= test) && (test < kNumberOfDRegIds); |
| 151 | } |
| 152 | |
| 153 | // Returns true if this DRegister overlaps SRegisters. |
| 154 | bool IsOverlappingDRegister() const { |
| 155 | CHECK(IsValidManagedRegister()); |
| 156 | const int test = id_ - (kNumberOfCoreRegIds + kNumberOfSRegIds); |
| 157 | return (0 <= test) && (test < kNumberOfOverlappingDRegIds); |
| 158 | } |
| 159 | |
| 160 | bool IsRegisterPair() const { |
| 161 | CHECK(IsValidManagedRegister()); |
| 162 | const int test = |
| 163 | id_ - (kNumberOfCoreRegIds + kNumberOfSRegIds + kNumberOfDRegIds); |
| 164 | return (0 <= test) && (test < kNumberOfPairRegIds); |
| 165 | } |
| 166 | |
Ian Rogers | 2c8f653 | 2011-09-02 17:16:34 -0700 | [diff] [blame] | 167 | bool IsSameType(ArmManagedRegister test) const { |
Ian Rogers | b033c75 | 2011-07-20 12:22:35 -0700 | [diff] [blame] | 168 | CHECK(IsValidManagedRegister() && test.IsValidManagedRegister()); |
| 169 | return |
| 170 | (IsCoreRegister() && test.IsCoreRegister()) || |
| 171 | (IsSRegister() && test.IsSRegister()) || |
| 172 | (IsDRegister() && test.IsDRegister()) || |
| 173 | (IsRegisterPair() && test.IsRegisterPair()); |
| 174 | } |
| 175 | |
Ian Rogers | b033c75 | 2011-07-20 12:22:35 -0700 | [diff] [blame] | 176 | |
| 177 | // Returns true if the two managed-registers ('this' and 'other') overlap. |
| 178 | // Either managed-register may be the NoRegister. If both are the NoRegister |
| 179 | // then false is returned. |
Ian Rogers | 2c8f653 | 2011-09-02 17:16:34 -0700 | [diff] [blame] | 180 | bool Overlaps(const ArmManagedRegister& other) const; |
Ian Rogers | b033c75 | 2011-07-20 12:22:35 -0700 | [diff] [blame] | 181 | |
| 182 | void Print(std::ostream& os) const; |
| 183 | |
Ian Rogers | 2c8f653 | 2011-09-02 17:16:34 -0700 | [diff] [blame] | 184 | static ArmManagedRegister FromCoreRegister(Register r) { |
Ian Rogers | b033c75 | 2011-07-20 12:22:35 -0700 | [diff] [blame] | 185 | CHECK_NE(r, kNoRegister); |
| 186 | return FromRegId(r); |
| 187 | } |
| 188 | |
Ian Rogers | 2c8f653 | 2011-09-02 17:16:34 -0700 | [diff] [blame] | 189 | static ArmManagedRegister FromSRegister(SRegister r) { |
Ian Rogers | b033c75 | 2011-07-20 12:22:35 -0700 | [diff] [blame] | 190 | CHECK_NE(r, kNoSRegister); |
| 191 | return FromRegId(r + kNumberOfCoreRegIds); |
| 192 | } |
| 193 | |
Ian Rogers | 2c8f653 | 2011-09-02 17:16:34 -0700 | [diff] [blame] | 194 | static ArmManagedRegister FromDRegister(DRegister r) { |
Ian Rogers | b033c75 | 2011-07-20 12:22:35 -0700 | [diff] [blame] | 195 | CHECK_NE(r, kNoDRegister); |
| 196 | return FromRegId(r + (kNumberOfCoreRegIds + kNumberOfSRegIds)); |
| 197 | } |
| 198 | |
Ian Rogers | 2c8f653 | 2011-09-02 17:16:34 -0700 | [diff] [blame] | 199 | static ArmManagedRegister FromRegisterPair(RegisterPair r) { |
Ian Rogers | b033c75 | 2011-07-20 12:22:35 -0700 | [diff] [blame] | 200 | CHECK_NE(r, kNoRegisterPair); |
| 201 | return FromRegId(r + (kNumberOfCoreRegIds + |
| 202 | kNumberOfSRegIds + kNumberOfDRegIds)); |
| 203 | } |
| 204 | |
| 205 | // Return a RegisterPair consisting of Register r_low and r_low + 1. |
Ian Rogers | 2c8f653 | 2011-09-02 17:16:34 -0700 | [diff] [blame] | 206 | static ArmManagedRegister FromCoreRegisterPair(Register r_low) { |
Ian Rogers | 7a99c11 | 2011-09-07 12:48:27 -0700 | [diff] [blame] | 207 | if (r_low != R1) { // not the dalvik special case |
| 208 | CHECK_NE(r_low, kNoRegister); |
| 209 | CHECK_EQ(0, (r_low % 2)); |
| 210 | const int r = r_low / 2; |
| 211 | CHECK_LT(r, kNumberOfPairRegIds); |
| 212 | return FromRegisterPair(static_cast<RegisterPair>(r)); |
| 213 | } else { |
| 214 | return FromRegisterPair(R1_R2); |
| 215 | } |
Ian Rogers | b033c75 | 2011-07-20 12:22:35 -0700 | [diff] [blame] | 216 | } |
| 217 | |
| 218 | // Return a DRegister overlapping SRegister r_low and r_low + 1. |
Ian Rogers | 2c8f653 | 2011-09-02 17:16:34 -0700 | [diff] [blame] | 219 | static ArmManagedRegister FromSRegisterPair(SRegister r_low) { |
Ian Rogers | b033c75 | 2011-07-20 12:22:35 -0700 | [diff] [blame] | 220 | CHECK_NE(r_low, kNoSRegister); |
| 221 | CHECK_EQ(0, (r_low % 2)); |
| 222 | const int r = r_low / 2; |
| 223 | CHECK_LT(r, kNumberOfOverlappingDRegIds); |
| 224 | return FromDRegister(static_cast<DRegister>(r)); |
| 225 | } |
| 226 | |
| 227 | private: |
Ian Rogers | b033c75 | 2011-07-20 12:22:35 -0700 | [diff] [blame] | 228 | bool IsValidManagedRegister() const { |
| 229 | return (0 <= id_) && (id_ < kNumberOfRegIds); |
| 230 | } |
| 231 | |
| 232 | int RegId() const { |
| 233 | CHECK(!IsNoRegister()); |
| 234 | return id_; |
| 235 | } |
| 236 | |
| 237 | int AllocId() const { |
| 238 | CHECK(IsValidManagedRegister() && |
| 239 | !IsOverlappingDRegister() && !IsRegisterPair()); |
| 240 | int r = id_; |
| 241 | if ((kNumberOfDAllocIds > 0) && IsDRegister()) { // VFPv3-D32 only. |
| 242 | r -= kNumberOfOverlappingDRegIds; |
| 243 | } |
| 244 | CHECK_LT(r, kNumberOfAllocIds); |
| 245 | return r; |
| 246 | } |
| 247 | |
| 248 | int AllocIdLow() const; |
| 249 | int AllocIdHigh() const; |
| 250 | |
Ian Rogers | 2c8f653 | 2011-09-02 17:16:34 -0700 | [diff] [blame] | 251 | friend class ManagedRegister; |
| 252 | |
Elliott Hughes | a51a3dd | 2011-10-17 15:19:26 -0700 | [diff] [blame] | 253 | explicit ArmManagedRegister(int reg_id) : ManagedRegister(reg_id) {} |
Ian Rogers | 2c8f653 | 2011-09-02 17:16:34 -0700 | [diff] [blame] | 254 | |
| 255 | static ArmManagedRegister FromRegId(int reg_id) { |
| 256 | ArmManagedRegister reg(reg_id); |
Ian Rogers | b033c75 | 2011-07-20 12:22:35 -0700 | [diff] [blame] | 257 | CHECK(reg.IsValidManagedRegister()); |
| 258 | return reg; |
| 259 | } |
Ian Rogers | b033c75 | 2011-07-20 12:22:35 -0700 | [diff] [blame] | 260 | }; |
| 261 | |
Ian Rogers | 2c8f653 | 2011-09-02 17:16:34 -0700 | [diff] [blame] | 262 | std::ostream& operator<<(std::ostream& os, const ArmManagedRegister& reg); |
| 263 | |
| 264 | } // namespace arm |
| 265 | |
| 266 | inline arm::ArmManagedRegister ManagedRegister::AsArm() const { |
| 267 | arm::ArmManagedRegister reg(id_); |
| 268 | CHECK(reg.IsNoRegister() || reg.IsValidManagedRegister()); |
| 269 | return reg; |
| 270 | } |
Ian Rogers | b033c75 | 2011-07-20 12:22:35 -0700 | [diff] [blame] | 271 | |
| 272 | } // namespace art |
| 273 | |
| 274 | #endif // ART_SRC_MANAGED_REGISTER_ARM_H_ |