| /* |
| * Copyright (C) 2014 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #ifndef ART_COMPILER_OPTIMIZING_PARALLEL_MOVE_RESOLVER_H_ |
| #define ART_COMPILER_OPTIMIZING_PARALLEL_MOVE_RESOLVER_H_ |
| |
| #include "base/value_object.h" |
| #include "utils/growable_array.h" |
| |
| namespace art { |
| |
| class HParallelMove; |
| class Location; |
| class MoveOperands; |
| |
| /** |
| * Helper class to resolve a set of parallel moves. Architecture dependent code |
| * generator must have their own subclass that implements the `EmitMove` and `EmitSwap` |
| * operations. |
| */ |
| class ParallelMoveResolver : public ValueObject { |
| public: |
| explicit ParallelMoveResolver(ArenaAllocator* allocator) : moves_(allocator, 32) {} |
| virtual ~ParallelMoveResolver() {} |
| |
| // Resolve a set of parallel moves, emitting assembler instructions. |
| void EmitNativeCode(HParallelMove* parallel_move); |
| |
| protected: |
| class ScratchRegisterScope : public ValueObject { |
| public: |
| ScratchRegisterScope(ParallelMoveResolver* resolver, |
| int blocked, |
| int if_scratch, |
| int number_of_registers); |
| ~ScratchRegisterScope(); |
| |
| int GetRegister() const { return reg_; } |
| bool IsSpilled() const { return spilled_; } |
| |
| private: |
| ParallelMoveResolver* resolver_; |
| int reg_; |
| bool spilled_; |
| }; |
| |
| bool IsScratchLocation(Location loc); |
| int AllocateScratchRegister(int blocked, int if_scratch, int register_count, bool* spilled); |
| |
| // Emit a move. |
| virtual void EmitMove(size_t index) = 0; |
| |
| // Execute a move by emitting a swap of two operands. |
| virtual void EmitSwap(size_t index) = 0; |
| |
| virtual void SpillScratch(int reg) = 0; |
| virtual void RestoreScratch(int reg) = 0; |
| |
| // List of moves not yet resolved. |
| GrowableArray<MoveOperands*> moves_; |
| |
| static constexpr int kNoRegister = -1; |
| |
| private: |
| // Build the initial list of moves. |
| void BuildInitialMoveList(HParallelMove* parallel_move); |
| |
| // Perform the move at the moves_ index in question (possibly requiring |
| // other moves to satisfy dependencies). |
| void PerformMove(size_t index); |
| |
| DISALLOW_COPY_AND_ASSIGN(ParallelMoveResolver); |
| }; |
| |
| } // namespace art |
| |
| #endif // ART_COMPILER_OPTIMIZING_PARALLEL_MOVE_RESOLVER_H_ |