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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_arm.h"
     18 
     19 #include "globals.h"
     20 
     21 namespace art {
     22 namespace arm {
     23 
     24 // Returns true if this managed-register overlaps the other managed-register.
     25 bool ArmManagedRegister::Overlaps(const ArmManagedRegister& other) const {
     26   if (IsNoRegister() || other.IsNoRegister()) return false;
     27   if (Equals(other)) return true;
     28   if (IsRegisterPair()) {
     29     Register low = AsRegisterPairLow();
     30     Register high = AsRegisterPairHigh();
     31     return ArmManagedRegister::FromCoreRegister(low).Overlaps(other) ||
     32         ArmManagedRegister::FromCoreRegister(high).Overlaps(other);
     33   }
     34   if (IsOverlappingDRegister()) {
     35     if (other.IsDRegister()) return Equals(other);
     36     if (other.IsSRegister()) {
     37       SRegister low = AsOverlappingDRegisterLow();
     38       SRegister high = AsOverlappingDRegisterHigh();
     39       SRegister other_sreg = other.AsSRegister();
     40       return (low == other_sreg) || (high == other_sreg);
     41     }
     42     return false;
     43   }
     44   if (other.IsRegisterPair() || other.IsOverlappingDRegister()) {
     45     return other.Overlaps(*this);
     46   }
     47   return false;
     48 }
     49 
     50 
     51 int ArmManagedRegister::AllocIdLow() const {
     52   CHECK(IsOverlappingDRegister() || IsRegisterPair());
     53   const int r = RegId() - (kNumberOfCoreRegIds + kNumberOfSRegIds);
     54   int low;
     55   if (r < kNumberOfOverlappingDRegIds) {
     56     CHECK(IsOverlappingDRegister());
     57     low = (r * 2) + kNumberOfCoreRegIds;  // Return a SRegister.
     58   } else {
     59     CHECK(IsRegisterPair());
     60     low = (r - kNumberOfDRegIds) * 2;  // Return a Register.
     61     if (low > 6) {
     62       // we didn't got a pair higher than R6_R7, must be the dalvik special case
     63       low = 1;
     64     }
     65   }
     66   return low;
     67 }
     68 
     69 
     70 int ArmManagedRegister::AllocIdHigh() const {
     71   return AllocIdLow() + 1;
     72 }
     73 
     74 
     75 void ArmManagedRegister::Print(std::ostream& os) const {
     76   if (!IsValidManagedRegister()) {
     77     os << "No Register";
     78   } else if (IsCoreRegister()) {
     79     os << "Core: " << static_cast<int>(AsCoreRegister());
     80   } else if (IsRegisterPair()) {
     81     os << "Pair: " << static_cast<int>(AsRegisterPairLow()) << ", "
     82        << static_cast<int>(AsRegisterPairHigh());
     83   } else if (IsSRegister()) {
     84     os << "SRegister: " << static_cast<int>(AsSRegister());
     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 ArmManagedRegister& reg) {
     93   reg.Print(os);
     94   return os;
     95 }
     96 
     97 std::ostream& operator<<(std::ostream& os, const RegisterPair& r) {
     98   os << ArmManagedRegister::FromRegisterPair(r);
     99   return os;
    100 }
    101 
    102 }  // namespace arm
    103 }  // namespace art
    104