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/*
* Copyright (C) 2016 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_REGISTER_ALLOCATION_RESOLVER_H_
#define ART_COMPILER_OPTIMIZING_REGISTER_ALLOCATION_RESOLVER_H_
#include "base/arena_containers.h"
#include "base/value_object.h"
#include "primitive.h"
namespace art {
class ArenaAllocator;
class CodeGenerator;
class HBasicBlock;
class HInstruction;
class HParallelMove;
class LiveInterval;
class Location;
class SsaLivenessAnalysis;
/**
* Reconciles the locations assigned to live intervals with the location
* summary of each instruction, and inserts moves to resolve split intervals,
* nonlinear control flow, and phi inputs.
*/
class RegisterAllocationResolver : ValueObject {
public:
RegisterAllocationResolver(ArenaAllocator* allocator,
CodeGenerator* codegen,
const SsaLivenessAnalysis& liveness);
void Resolve(size_t max_safepoint_live_core_regs,
size_t max_safepoint_live_fp_regs,
size_t reserved_out_slots, // Includes slot(s) for the art method.
size_t int_spill_slots,
size_t long_spill_slots,
size_t float_spill_slots,
size_t double_spill_slots,
size_t catch_phi_spill_slots,
const ArenaVector<LiveInterval*>& temp_intervals);
private:
// Connect adjacent siblings within blocks, and resolve inputs along the way.
// Uses max_safepoint_live_regs to check that we did not underestimate the
// number of live registers at safepoints.
void ConnectSiblings(LiveInterval* interval, size_t max_safepoint_live_regs);
// Connect siblings between block entries and exits.
void ConnectSplitSiblings(LiveInterval* interval, HBasicBlock* from, HBasicBlock* to) const;
// Helper methods for inserting parallel moves in the graph.
void InsertParallelMoveAtExitOf(HBasicBlock* block,
HInstruction* instruction,
Location source,
Location destination) const;
void InsertParallelMoveAtEntryOf(HBasicBlock* block,
HInstruction* instruction,
Location source,
Location destination) const;
void InsertMoveAfter(HInstruction* instruction, Location source, Location destination) const;
void AddInputMoveFor(HInstruction* input,
HInstruction* user,
Location source,
Location destination) const;
void InsertParallelMoveAt(size_t position,
HInstruction* instruction,
Location source,
Location destination) const;
void AddMove(HParallelMove* move,
Location source,
Location destination,
HInstruction* instruction,
Primitive::Type type) const;
ArenaAllocator* const allocator_;
CodeGenerator* const codegen_;
const SsaLivenessAnalysis& liveness_;
DISALLOW_COPY_AND_ASSIGN(RegisterAllocationResolver);
};
} // namespace art
#endif // ART_COMPILER_OPTIMIZING_REGISTER_ALLOCATION_RESOLVER_H_
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