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      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_mips.h"
     18 
     19 #include "globals.h"
     20 
     21 namespace art {
     22 namespace mips {
     23 
     24 // These core registers are never available for allocation.
     25 static const Register kReservedCoreRegistersArray[] = { S0, S1 };
     26 
     27 // We need all registers for caching.
     28 static const int kNumberOfAvailableCoreRegisters = (S7 - T0) + 1;
     29 static const int kNumberOfAvailableFRegisters = kNumberOfFRegisters;
     30 static const int kNumberOfAvailableDRegisters = kNumberOfDRegisters;
     31 static const int kNumberOfAvailableOverlappingDRegisters =
     32     kNumberOfOverlappingDRegisters;
     33 static const int kNumberOfAvailableRegisterPairs = kNumberOfRegisterPairs;
     34 
     35 bool MipsManagedRegister::Overlaps(const MipsManagedRegister& other) const {
     36   if (IsNoRegister() || other.IsNoRegister()) return false;
     37   CHECK(IsValidManagedRegister());
     38   CHECK(other.IsValidManagedRegister());
     39   if (Equals(other)) return true;
     40   if (IsRegisterPair()) {
     41     Register low = AsRegisterPairLow();
     42     Register high = AsRegisterPairHigh();
     43     return MipsManagedRegister::FromCoreRegister(low).Overlaps(other) ||
     44         MipsManagedRegister::FromCoreRegister(high).Overlaps(other);
     45   }
     46   if (IsOverlappingDRegister()) {
     47     if (other.IsDRegister()) return Equals(other);
     48     if (other.IsFRegister()) {
     49       FRegister low = AsOverlappingDRegisterLow();
     50       FRegister high = AsOverlappingDRegisterHigh();
     51       FRegister other_freg = other.AsFRegister();
     52       return (low == other_freg) || (high == other_freg);
     53     }
     54     return false;
     55   }
     56   if (other.IsRegisterPair() || other.IsOverlappingDRegister()) {
     57     return other.Overlaps(*this);
     58   }
     59   return false;
     60 }
     61 
     62 
     63 int MipsManagedRegister::AllocIdLow() const {
     64   CHECK(IsOverlappingDRegister() || IsRegisterPair());
     65   const int r = RegId() - (kNumberOfCoreRegIds + kNumberOfFRegIds);
     66   int low;
     67   if (r < kNumberOfOverlappingDRegIds) {
     68     CHECK(IsOverlappingDRegister());
     69     low = (r * 2) + kNumberOfCoreRegIds;  // Return an FRegister.
     70   } else {
     71     CHECK(IsRegisterPair());
     72     low = (r - kNumberOfDRegIds) * 2 + 2;  // Return a Register.
     73     if (low >= 24) {
     74       // we got a pair higher than S6_S7, must be the dalvik special case
     75       low = 5;
     76     }
     77   }
     78   return low;
     79 }
     80 
     81 
     82 int MipsManagedRegister::AllocIdHigh() const {
     83   return AllocIdLow() + 1;
     84 }
     85 
     86 
     87 void MipsManagedRegister::Print(std::ostream& os) const {
     88   if (!IsValidManagedRegister()) {
     89     os << "No Register";
     90   } else if (IsCoreRegister()) {
     91     os << "Core: " << static_cast<int>(AsCoreRegister());
     92   } else if (IsRegisterPair()) {
     93     os << "Pair: " << AsRegisterPairLow() << ", " << AsRegisterPairHigh();
     94   } else if (IsFRegister()) {
     95     os << "FRegister: " << static_cast<int>(AsFRegister());
     96   } else if (IsDRegister()) {
     97     os << "DRegister: " << static_cast<int>(AsDRegister());
     98   } else {
     99     os << "??: " << RegId();
    100   }
    101 }
    102 
    103 std::ostream& operator<<(std::ostream& os, const MipsManagedRegister& reg) {
    104   reg.Print(os);
    105   return os;
    106 }
    107 
    108 std::ostream& operator<<(std::ostream& os, const RegisterPair& reg) {
    109   os << MipsManagedRegister::FromRegisterPair(reg);
    110   return os;
    111 }
    112 
    113 }  // namespace mips
    114 }  // namespace art
    115