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      1 /*
      2  * Copyright (C) 2014 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 #ifndef ART_COMPILER_UTILS_MIPS64_MANAGED_REGISTER_MIPS64_H_
     18 #define ART_COMPILER_UTILS_MIPS64_MANAGED_REGISTER_MIPS64_H_
     19 
     20 #include "constants_mips64.h"
     21 #include "debug/dwarf/register.h"
     22 #include "utils/managed_register.h"
     23 
     24 namespace art {
     25 namespace mips64 {
     26 
     27 const int kNumberOfGpuRegIds = kNumberOfGpuRegisters;
     28 const int kNumberOfGpuAllocIds = kNumberOfGpuRegisters;
     29 
     30 const int kNumberOfFpuRegIds = kNumberOfFpuRegisters;
     31 const int kNumberOfFpuAllocIds = kNumberOfFpuRegisters;
     32 
     33 const int kNumberOfRegIds = kNumberOfGpuRegIds + kNumberOfFpuRegIds;
     34 const int kNumberOfAllocIds = kNumberOfGpuAllocIds + kNumberOfFpuAllocIds;
     35 
     36 // An instance of class 'ManagedRegister' represents a single GPU register (enum
     37 // Register) or a double precision FP register (enum FpuRegister)
     38 // 'ManagedRegister::NoRegister()' provides an invalid register.
     39 // There is a one-to-one mapping between ManagedRegister and register id.
     40 class Mips64ManagedRegister : public ManagedRegister {
     41  public:
     42   GpuRegister AsGpuRegister() const {
     43     CHECK(IsGpuRegister());
     44     return static_cast<GpuRegister>(id_);
     45   }
     46 
     47   FpuRegister AsFpuRegister() const {
     48     CHECK(IsFpuRegister());
     49     return static_cast<FpuRegister>(id_ - kNumberOfGpuRegIds);
     50   }
     51 
     52   bool IsGpuRegister() const {
     53     CHECK(IsValidManagedRegister());
     54     return (0 <= id_) && (id_ < kNumberOfGpuRegIds);
     55   }
     56 
     57   bool IsFpuRegister() const {
     58     CHECK(IsValidManagedRegister());
     59     const int test = id_ - kNumberOfGpuRegIds;
     60     return (0 <= test) && (test < kNumberOfFpuRegIds);
     61   }
     62 
     63   void Print(std::ostream& os) const;
     64 
     65   // Returns true if the two managed-registers ('this' and 'other') overlap.
     66   // Either managed-register may be the NoRegister. If both are the NoRegister
     67   // then false is returned.
     68   bool Overlaps(const Mips64ManagedRegister& other) const;
     69 
     70   static Mips64ManagedRegister FromGpuRegister(GpuRegister r) {
     71     CHECK_NE(r, kNoGpuRegister);
     72     return FromRegId(r);
     73   }
     74 
     75   static Mips64ManagedRegister FromFpuRegister(FpuRegister r) {
     76     CHECK_NE(r, kNoFpuRegister);
     77     return FromRegId(r + kNumberOfGpuRegIds);
     78   }
     79 
     80  private:
     81   bool IsValidManagedRegister() const {
     82     return (0 <= id_) && (id_ < kNumberOfRegIds);
     83   }
     84 
     85   int RegId() const {
     86     CHECK(!IsNoRegister());
     87     return id_;
     88   }
     89 
     90   int AllocId() const {
     91     CHECK(IsValidManagedRegister());
     92     CHECK_LT(id_, kNumberOfAllocIds);
     93     return id_;
     94   }
     95 
     96   int AllocIdLow() const;
     97   int AllocIdHigh() const;
     98 
     99   friend class ManagedRegister;
    100 
    101   explicit Mips64ManagedRegister(int reg_id) : ManagedRegister(reg_id) {}
    102 
    103   static Mips64ManagedRegister FromRegId(int reg_id) {
    104     Mips64ManagedRegister reg(reg_id);
    105     CHECK(reg.IsValidManagedRegister());
    106     return reg;
    107   }
    108 };
    109 
    110 std::ostream& operator<<(std::ostream& os, const Mips64ManagedRegister& reg);
    111 
    112 }  // namespace mips64
    113 
    114 inline mips64::Mips64ManagedRegister ManagedRegister::AsMips64() const {
    115   mips64::Mips64ManagedRegister reg(id_);
    116   CHECK(reg.IsNoRegister() || reg.IsValidManagedRegister());
    117   return reg;
    118 }
    119 
    120 }  // namespace art
    121 
    122 #endif  // ART_COMPILER_UTILS_MIPS64_MANAGED_REGISTER_MIPS64_H_
    123