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/*
* 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 "utils/allocation.h"
#include "utils/growable_array.h"
namespace art {
class HParallelMove;
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:
// 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;
// List of moves not yet resolved.
GrowableArray<MoveOperands*> moves_;
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_
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