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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 bool MipsManagedRegister::Overlaps(const MipsManagedRegister& other) const {
     25   if (IsNoRegister() || other.IsNoRegister()) return false;
     26   CHECK(IsValidManagedRegister());
     27   CHECK(other.IsValidManagedRegister());
     28   if (Equals(other)) return true;
     29   if (IsRegisterPair()) {
     30     Register low = AsRegisterPairLow();
     31     Register high = AsRegisterPairHigh();
     32     return MipsManagedRegister::FromCoreRegister(low).Overlaps(other) ||
     33         MipsManagedRegister::FromCoreRegister(high).Overlaps(other);
     34   }
     35   if (IsOverlappingDRegister()) {
     36     if (other.IsDRegister()) return Equals(other);
     37     if (other.IsFRegister()) {
     38       FRegister low = AsOverlappingDRegisterLow();
     39       FRegister high = AsOverlappingDRegisterHigh();
     40       FRegister other_freg = other.AsFRegister();
     41       return (low == other_freg) || (high == other_freg);
     42     }
     43     return false;
     44   }
     45   if (other.IsRegisterPair() || other.IsOverlappingDRegister()) {
     46     return other.Overlaps(*this);
     47   }
     48   return false;
     49 }
     50 
     51 
     52 int MipsManagedRegister::AllocIdLow() const {
     53   CHECK(IsOverlappingDRegister() || IsRegisterPair());
     54   const int r = RegId() - (kNumberOfCoreRegIds + kNumberOfFRegIds);
     55   int low;
     56   if (r < kNumberOfOverlappingDRegIds) {
     57     CHECK(IsOverlappingDRegister());
     58     low = (r * 2) + kNumberOfCoreRegIds;  // Return an FRegister.
     59   } else {
     60     CHECK(IsRegisterPair());
     61     low = (r - kNumberOfDRegIds) * 2 + 2;  // Return a Register.
     62     if (low >= 24) {
     63       // we got a pair higher than S6_S7, must be the dalvik special case
     64       low = 5;
     65     }
     66   }
     67   return low;
     68 }
     69 
     70 
     71 int MipsManagedRegister::AllocIdHigh() const {
     72   return AllocIdLow() + 1;
     73 }
     74 
     75 
     76 void MipsManagedRegister::Print(std::ostream& os) const {
     77   if (!IsValidManagedRegister()) {
     78     os << "No Register";
     79   } else if (IsCoreRegister()) {
     80     os << "Core: " << static_cast<int>(AsCoreRegister());
     81   } else if (IsRegisterPair()) {
     82     os << "Pair: " << AsRegisterPairLow() << ", " << AsRegisterPairHigh();
     83   } else if (IsFRegister()) {
     84     os << "FRegister: " << static_cast<int>(AsFRegister());
     85   } else if (IsDRegister()) {
     86     os << "DRegister: " << static_cast<int>(AsDRegister());
     87   } else {
     88     os << "??: " << RegId();
     89   }
     90 }
     91 
     92 std::ostream& operator<<(std::ostream& os, const MipsManagedRegister& reg) {
     93   reg.Print(os);
     94   return os;
     95 }
     96 
     97 std::ostream& operator<<(std::ostream& os, const RegisterPair& reg) {
     98   os << MipsManagedRegister::FromRegisterPair(reg);
     99   return os;
    100 }
    101 
    102 }  // namespace mips
    103 }  // namespace art
    104