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      1 /*
      2  * Copyright (C) 2016 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_OPTIMIZING_REGISTER_ALLOCATION_RESOLVER_H_
     18 #define ART_COMPILER_OPTIMIZING_REGISTER_ALLOCATION_RESOLVER_H_
     19 
     20 #include "base/array_ref.h"
     21 #include "base/value_object.h"
     22 #include "data_type.h"
     23 
     24 namespace art {
     25 
     26 class ArenaAllocator;
     27 class CodeGenerator;
     28 class HBasicBlock;
     29 class HInstruction;
     30 class HParallelMove;
     31 class LiveInterval;
     32 class Location;
     33 class SsaLivenessAnalysis;
     34 
     35 /**
     36  * Reconciles the locations assigned to live intervals with the location
     37  * summary of each instruction, and inserts moves to resolve split intervals,
     38  * nonlinear control flow, and phi inputs.
     39  */
     40 class RegisterAllocationResolver : ValueObject {
     41  public:
     42   RegisterAllocationResolver(CodeGenerator* codegen, const SsaLivenessAnalysis& liveness);
     43 
     44   void Resolve(ArrayRef<HInstruction* const> safepoints,
     45                size_t reserved_out_slots,  // Includes slot(s) for the art method.
     46                size_t int_spill_slots,
     47                size_t long_spill_slots,
     48                size_t float_spill_slots,
     49                size_t double_spill_slots,
     50                size_t catch_phi_spill_slots,
     51                ArrayRef<LiveInterval* const> temp_intervals);
     52 
     53  private:
     54   // Update live registers of safepoint location summary.
     55   void UpdateSafepointLiveRegisters();
     56 
     57   // Calculate the maximum size of the spill area for safepoints.
     58   size_t CalculateMaximumSafepointSpillSize(ArrayRef<HInstruction* const> safepoints);
     59 
     60   // Connect adjacent siblings within blocks, and resolve inputs along the way.
     61   void ConnectSiblings(LiveInterval* interval);
     62 
     63   // Connect siblings between block entries and exits.
     64   void ConnectSplitSiblings(LiveInterval* interval, HBasicBlock* from, HBasicBlock* to) const;
     65 
     66   // Helper methods for inserting parallel moves in the graph.
     67   void InsertParallelMoveAtExitOf(HBasicBlock* block,
     68                                   HInstruction* instruction,
     69                                   Location source,
     70                                   Location destination) const;
     71   void InsertParallelMoveAtEntryOf(HBasicBlock* block,
     72                                    HInstruction* instruction,
     73                                    Location source,
     74                                    Location destination) const;
     75   void InsertMoveAfter(HInstruction* instruction, Location source, Location destination) const;
     76   void AddInputMoveFor(HInstruction* input,
     77                        HInstruction* user,
     78                        Location source,
     79                        Location destination) const;
     80   void InsertParallelMoveAt(size_t position,
     81                             HInstruction* instruction,
     82                             Location source,
     83                             Location destination) const;
     84   void AddMove(HParallelMove* move,
     85                Location source,
     86                Location destination,
     87                HInstruction* instruction,
     88                DataType::Type type) const;
     89 
     90   ArenaAllocator* const allocator_;
     91   CodeGenerator* const codegen_;
     92   const SsaLivenessAnalysis& liveness_;
     93 
     94   DISALLOW_COPY_AND_ASSIGN(RegisterAllocationResolver);
     95 };
     96 
     97 }  // namespace art
     98 
     99 #endif  // ART_COMPILER_OPTIMIZING_REGISTER_ALLOCATION_RESOLVER_H_
    100