Ian Rogers | b033c75 | 2011-07-20 12:22:35 -0700 | [diff] [blame] | 1 | // Copyright 2011 Google Inc. All Rights Reserved. |
| 2 | |
| 3 | #ifndef ART_SRC_MANAGED_REGISTER_ARM_H_ |
| 4 | #define ART_SRC_MANAGED_REGISTER_ARM_H_ |
| 5 | |
Brian Carlstrom | 578bbdc | 2011-07-21 14:07:47 -0700 | [diff] [blame] | 6 | #include "constants.h" |
| 7 | #include "logging.h" |
Ian Rogers | 2c8f653 | 2011-09-02 17:16:34 -0700 | [diff] [blame] | 8 | #include "managed_register.h" |
Ian Rogers | b033c75 | 2011-07-20 12:22:35 -0700 | [diff] [blame] | 9 | |
| 10 | namespace art { |
Ian Rogers | 2c8f653 | 2011-09-02 17:16:34 -0700 | [diff] [blame] | 11 | namespace arm { |
Ian Rogers | b033c75 | 2011-07-20 12:22:35 -0700 | [diff] [blame] | 12 | |
| 13 | // Values for register pairs. |
| 14 | enum RegisterPair { |
| 15 | R0_R1 = 0, |
| 16 | R2_R3 = 1, |
| 17 | R4_R5 = 2, |
| 18 | R6_R7 = 3, |
Ian Rogers | 7a99c11 | 2011-09-07 12:48:27 -0700 | [diff] [blame] | 19 | R1_R2 = 4, // Dalvik style passing |
| 20 | kNumberOfRegisterPairs = 5, |
Ian Rogers | b033c75 | 2011-07-20 12:22:35 -0700 | [diff] [blame] | 21 | kNoRegisterPair = -1, |
| 22 | }; |
| 23 | |
| 24 | std::ostream& operator<<(std::ostream& os, const RegisterPair& reg); |
| 25 | |
| 26 | const int kNumberOfCoreRegIds = kNumberOfCoreRegisters; |
| 27 | const int kNumberOfCoreAllocIds = kNumberOfCoreRegisters; |
| 28 | |
| 29 | const int kNumberOfSRegIds = kNumberOfSRegisters; |
| 30 | const int kNumberOfSAllocIds = kNumberOfSRegisters; |
| 31 | |
| 32 | const int kNumberOfDRegIds = kNumberOfDRegisters; |
| 33 | const int kNumberOfOverlappingDRegIds = kNumberOfOverlappingDRegisters; |
| 34 | const int kNumberOfDAllocIds = kNumberOfDRegIds - kNumberOfOverlappingDRegIds; |
| 35 | |
| 36 | const int kNumberOfPairRegIds = kNumberOfRegisterPairs; |
| 37 | |
| 38 | const int kNumberOfRegIds = kNumberOfCoreRegIds + kNumberOfSRegIds + |
| 39 | kNumberOfDRegIds + kNumberOfPairRegIds; |
| 40 | const int kNumberOfAllocIds = |
| 41 | kNumberOfCoreAllocIds + kNumberOfSAllocIds + kNumberOfDAllocIds; |
| 42 | |
| 43 | // Register ids map: |
| 44 | // [0..R[ core registers (enum Register) |
| 45 | // [R..S[ single precision VFP registers (enum SRegister) |
| 46 | // [S..D[ double precision VFP registers (enum DRegister) |
| 47 | // [D..P[ core register pairs (enum RegisterPair) |
| 48 | // where |
| 49 | // R = kNumberOfCoreRegIds |
| 50 | // S = R + kNumberOfSRegIds |
| 51 | // D = S + kNumberOfDRegIds |
| 52 | // P = D + kNumberOfRegisterPairs |
| 53 | |
| 54 | // Allocation ids map: |
| 55 | // [0..R[ core registers (enum Register) |
| 56 | // [R..S[ single precision VFP registers (enum SRegister) |
| 57 | // [S..N[ non-overlapping double precision VFP registers (16-31 in enum |
| 58 | // DRegister, VFPv3-D32 only) |
| 59 | // where |
| 60 | // R = kNumberOfCoreAllocIds |
| 61 | // S = R + kNumberOfSAllocIds |
| 62 | // N = S + kNumberOfDAllocIds |
| 63 | |
| 64 | |
| 65 | // An instance of class 'ManagedRegister' represents a single ARM register or a |
| 66 | // pair of core ARM registers (enum RegisterPair). A single register is either a |
| 67 | // core register (enum Register), a VFP single precision register |
| 68 | // (enum SRegister), or a VFP double precision register (enum DRegister). |
| 69 | // 'ManagedRegister::NoRegister()' returns an invalid ManagedRegister. |
| 70 | // There is a one-to-one mapping between ManagedRegister and register id. |
Ian Rogers | 2c8f653 | 2011-09-02 17:16:34 -0700 | [diff] [blame] | 71 | class ArmManagedRegister : public ManagedRegister { |
Ian Rogers | b033c75 | 2011-07-20 12:22:35 -0700 | [diff] [blame] | 72 | public: |
Ian Rogers | b033c75 | 2011-07-20 12:22:35 -0700 | [diff] [blame] | 73 | Register AsCoreRegister() const { |
| 74 | CHECK(IsCoreRegister()); |
| 75 | return static_cast<Register>(id_); |
| 76 | } |
| 77 | |
| 78 | SRegister AsSRegister() const { |
| 79 | CHECK(IsSRegister()); |
| 80 | return static_cast<SRegister>(id_ - kNumberOfCoreRegIds); |
| 81 | } |
| 82 | |
| 83 | DRegister AsDRegister() const { |
| 84 | CHECK(IsDRegister()); |
| 85 | return static_cast<DRegister>(id_ - kNumberOfCoreRegIds - kNumberOfSRegIds); |
| 86 | } |
| 87 | |
| 88 | SRegister AsOverlappingDRegisterLow() const { |
| 89 | CHECK(IsOverlappingDRegister()); |
| 90 | DRegister d_reg = AsDRegister(); |
| 91 | return static_cast<SRegister>(d_reg * 2); |
| 92 | } |
| 93 | |
| 94 | SRegister AsOverlappingDRegisterHigh() const { |
| 95 | CHECK(IsOverlappingDRegister()); |
| 96 | DRegister d_reg = AsDRegister(); |
| 97 | return static_cast<SRegister>(d_reg * 2 + 1); |
| 98 | } |
| 99 | |
| 100 | RegisterPair AsRegisterPair() const { |
| 101 | CHECK(IsRegisterPair()); |
| 102 | Register reg_low = AsRegisterPairLow(); |
Ian Rogers | 7a99c11 | 2011-09-07 12:48:27 -0700 | [diff] [blame] | 103 | if (reg_low == R1) { |
| 104 | return R1_R2; |
| 105 | } else { |
| 106 | return static_cast<RegisterPair>(reg_low / 2); |
| 107 | } |
Ian Rogers | b033c75 | 2011-07-20 12:22:35 -0700 | [diff] [blame] | 108 | } |
| 109 | |
| 110 | Register AsRegisterPairLow() const { |
| 111 | CHECK(IsRegisterPair()); |
| 112 | // Appropriate mapping of register ids allows to use AllocIdLow(). |
| 113 | return FromRegId(AllocIdLow()).AsCoreRegister(); |
| 114 | } |
| 115 | |
| 116 | Register AsRegisterPairHigh() const { |
| 117 | CHECK(IsRegisterPair()); |
| 118 | // Appropriate mapping of register ids allows to use AllocIdHigh(). |
| 119 | return FromRegId(AllocIdHigh()).AsCoreRegister(); |
| 120 | } |
| 121 | |
| 122 | bool IsCoreRegister() const { |
| 123 | CHECK(IsValidManagedRegister()); |
| 124 | return (0 <= id_) && (id_ < kNumberOfCoreRegIds); |
| 125 | } |
| 126 | |
| 127 | bool IsSRegister() const { |
| 128 | CHECK(IsValidManagedRegister()); |
| 129 | const int test = id_ - kNumberOfCoreRegIds; |
| 130 | return (0 <= test) && (test < kNumberOfSRegIds); |
| 131 | } |
| 132 | |
| 133 | bool IsDRegister() const { |
| 134 | CHECK(IsValidManagedRegister()); |
| 135 | const int test = id_ - (kNumberOfCoreRegIds + kNumberOfSRegIds); |
| 136 | return (0 <= test) && (test < kNumberOfDRegIds); |
| 137 | } |
| 138 | |
| 139 | // Returns true if this DRegister overlaps SRegisters. |
| 140 | bool IsOverlappingDRegister() const { |
| 141 | CHECK(IsValidManagedRegister()); |
| 142 | const int test = id_ - (kNumberOfCoreRegIds + kNumberOfSRegIds); |
| 143 | return (0 <= test) && (test < kNumberOfOverlappingDRegIds); |
| 144 | } |
| 145 | |
| 146 | bool IsRegisterPair() const { |
| 147 | CHECK(IsValidManagedRegister()); |
| 148 | const int test = |
| 149 | id_ - (kNumberOfCoreRegIds + kNumberOfSRegIds + kNumberOfDRegIds); |
| 150 | return (0 <= test) && (test < kNumberOfPairRegIds); |
| 151 | } |
| 152 | |
Ian Rogers | 2c8f653 | 2011-09-02 17:16:34 -0700 | [diff] [blame] | 153 | bool IsSameType(ArmManagedRegister test) const { |
Ian Rogers | b033c75 | 2011-07-20 12:22:35 -0700 | [diff] [blame] | 154 | CHECK(IsValidManagedRegister() && test.IsValidManagedRegister()); |
| 155 | return |
| 156 | (IsCoreRegister() && test.IsCoreRegister()) || |
| 157 | (IsSRegister() && test.IsSRegister()) || |
| 158 | (IsDRegister() && test.IsDRegister()) || |
| 159 | (IsRegisterPair() && test.IsRegisterPair()); |
| 160 | } |
| 161 | |
Ian Rogers | b033c75 | 2011-07-20 12:22:35 -0700 | [diff] [blame] | 162 | |
| 163 | // Returns true if the two managed-registers ('this' and 'other') overlap. |
| 164 | // Either managed-register may be the NoRegister. If both are the NoRegister |
| 165 | // then false is returned. |
Ian Rogers | 2c8f653 | 2011-09-02 17:16:34 -0700 | [diff] [blame] | 166 | bool Overlaps(const ArmManagedRegister& other) const; |
Ian Rogers | b033c75 | 2011-07-20 12:22:35 -0700 | [diff] [blame] | 167 | |
| 168 | void Print(std::ostream& os) const; |
| 169 | |
Ian Rogers | 2c8f653 | 2011-09-02 17:16:34 -0700 | [diff] [blame] | 170 | static ArmManagedRegister FromCoreRegister(Register r) { |
Ian Rogers | b033c75 | 2011-07-20 12:22:35 -0700 | [diff] [blame] | 171 | CHECK_NE(r, kNoRegister); |
| 172 | return FromRegId(r); |
| 173 | } |
| 174 | |
Ian Rogers | 2c8f653 | 2011-09-02 17:16:34 -0700 | [diff] [blame] | 175 | static ArmManagedRegister FromSRegister(SRegister r) { |
Ian Rogers | b033c75 | 2011-07-20 12:22:35 -0700 | [diff] [blame] | 176 | CHECK_NE(r, kNoSRegister); |
| 177 | return FromRegId(r + kNumberOfCoreRegIds); |
| 178 | } |
| 179 | |
Ian Rogers | 2c8f653 | 2011-09-02 17:16:34 -0700 | [diff] [blame] | 180 | static ArmManagedRegister FromDRegister(DRegister r) { |
Ian Rogers | b033c75 | 2011-07-20 12:22:35 -0700 | [diff] [blame] | 181 | CHECK_NE(r, kNoDRegister); |
| 182 | return FromRegId(r + (kNumberOfCoreRegIds + kNumberOfSRegIds)); |
| 183 | } |
| 184 | |
Ian Rogers | 2c8f653 | 2011-09-02 17:16:34 -0700 | [diff] [blame] | 185 | static ArmManagedRegister FromRegisterPair(RegisterPair r) { |
Ian Rogers | b033c75 | 2011-07-20 12:22:35 -0700 | [diff] [blame] | 186 | CHECK_NE(r, kNoRegisterPair); |
| 187 | return FromRegId(r + (kNumberOfCoreRegIds + |
| 188 | kNumberOfSRegIds + kNumberOfDRegIds)); |
| 189 | } |
| 190 | |
| 191 | // Return a RegisterPair consisting of Register r_low and r_low + 1. |
Ian Rogers | 2c8f653 | 2011-09-02 17:16:34 -0700 | [diff] [blame] | 192 | static ArmManagedRegister FromCoreRegisterPair(Register r_low) { |
Ian Rogers | 7a99c11 | 2011-09-07 12:48:27 -0700 | [diff] [blame] | 193 | if (r_low != R1) { // not the dalvik special case |
| 194 | CHECK_NE(r_low, kNoRegister); |
| 195 | CHECK_EQ(0, (r_low % 2)); |
| 196 | const int r = r_low / 2; |
| 197 | CHECK_LT(r, kNumberOfPairRegIds); |
| 198 | return FromRegisterPair(static_cast<RegisterPair>(r)); |
| 199 | } else { |
| 200 | return FromRegisterPair(R1_R2); |
| 201 | } |
Ian Rogers | b033c75 | 2011-07-20 12:22:35 -0700 | [diff] [blame] | 202 | } |
| 203 | |
| 204 | // Return a DRegister overlapping SRegister r_low and r_low + 1. |
Ian Rogers | 2c8f653 | 2011-09-02 17:16:34 -0700 | [diff] [blame] | 205 | static ArmManagedRegister FromSRegisterPair(SRegister r_low) { |
Ian Rogers | b033c75 | 2011-07-20 12:22:35 -0700 | [diff] [blame] | 206 | CHECK_NE(r_low, kNoSRegister); |
| 207 | CHECK_EQ(0, (r_low % 2)); |
| 208 | const int r = r_low / 2; |
| 209 | CHECK_LT(r, kNumberOfOverlappingDRegIds); |
| 210 | return FromDRegister(static_cast<DRegister>(r)); |
| 211 | } |
| 212 | |
| 213 | private: |
Ian Rogers | b033c75 | 2011-07-20 12:22:35 -0700 | [diff] [blame] | 214 | bool IsValidManagedRegister() const { |
| 215 | return (0 <= id_) && (id_ < kNumberOfRegIds); |
| 216 | } |
| 217 | |
| 218 | int RegId() const { |
| 219 | CHECK(!IsNoRegister()); |
| 220 | return id_; |
| 221 | } |
| 222 | |
| 223 | int AllocId() const { |
| 224 | CHECK(IsValidManagedRegister() && |
| 225 | !IsOverlappingDRegister() && !IsRegisterPair()); |
| 226 | int r = id_; |
| 227 | if ((kNumberOfDAllocIds > 0) && IsDRegister()) { // VFPv3-D32 only. |
| 228 | r -= kNumberOfOverlappingDRegIds; |
| 229 | } |
| 230 | CHECK_LT(r, kNumberOfAllocIds); |
| 231 | return r; |
| 232 | } |
| 233 | |
| 234 | int AllocIdLow() const; |
| 235 | int AllocIdHigh() const; |
| 236 | |
Ian Rogers | 2c8f653 | 2011-09-02 17:16:34 -0700 | [diff] [blame] | 237 | friend class ManagedRegister; |
| 238 | |
Elliott Hughes | a51a3dd | 2011-10-17 15:19:26 -0700 | [diff] [blame] | 239 | explicit ArmManagedRegister(int reg_id) : ManagedRegister(reg_id) {} |
Ian Rogers | 2c8f653 | 2011-09-02 17:16:34 -0700 | [diff] [blame] | 240 | |
| 241 | static ArmManagedRegister FromRegId(int reg_id) { |
| 242 | ArmManagedRegister reg(reg_id); |
Ian Rogers | b033c75 | 2011-07-20 12:22:35 -0700 | [diff] [blame] | 243 | CHECK(reg.IsValidManagedRegister()); |
| 244 | return reg; |
| 245 | } |
Ian Rogers | b033c75 | 2011-07-20 12:22:35 -0700 | [diff] [blame] | 246 | }; |
| 247 | |
Ian Rogers | 2c8f653 | 2011-09-02 17:16:34 -0700 | [diff] [blame] | 248 | std::ostream& operator<<(std::ostream& os, const ArmManagedRegister& reg); |
| 249 | |
| 250 | } // namespace arm |
| 251 | |
| 252 | inline arm::ArmManagedRegister ManagedRegister::AsArm() const { |
| 253 | arm::ArmManagedRegister reg(id_); |
| 254 | CHECK(reg.IsNoRegister() || reg.IsValidManagedRegister()); |
| 255 | return reg; |
| 256 | } |
Ian Rogers | b033c75 | 2011-07-20 12:22:35 -0700 | [diff] [blame] | 257 | |
| 258 | } // namespace art |
| 259 | |
| 260 | #endif // ART_SRC_MANAGED_REGISTER_ARM_H_ |