reference_type_propagation.h revision 10e244f9e7f6d96a95c910a2bedef5bd3810c637 
1/*
2 * Copyright (C) 2015 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_REFERENCE_TYPE_PROPAGATION_H_
18#define ART_COMPILER_OPTIMIZING_REFERENCE_TYPE_PROPAGATION_H_
19
20#include "nodes.h"
21#include "optimization.h"
22
23namespace art {
24
25/**
26 * Propagates reference types to instructions.
27 * TODO: Currently only nullability is computed.
28 */
29class ReferenceTypePropagation : public HOptimization {
30 public:
31  explicit ReferenceTypePropagation(HGraph* graph)
32    : HOptimization(graph, true, "reference_type_propagation"),
33      worklist_(graph->GetArena(), kDefaultWorklistSize) {}
34
35  void Run() OVERRIDE;
36
37 private:
38  void VisitBasicBlock(HBasicBlock* block);
39  void ProcessWorklist();
40  void AddToWorklist(HPhi* phi);
41  void AddDependentInstructionsToWorklist(HPhi* phi);
42  bool UpdateNullability(HPhi* phi);
43
44  GrowableArray<HPhi*> worklist_;
45
46  static constexpr size_t kDefaultWorklistSize = 8;
47
48  DISALLOW_COPY_AND_ASSIGN(ReferenceTypePropagation);
49};
50
51}  // namespace art
52
53#endif  // ART_COMPILER_OPTIMIZING_REFERENCE_TYPE_PROPAGATION_H_
54