reference_type_propagation.h revision 00e3b38be4b280d6d7a7e843cd336ffbd2ba4365 
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 "driver/dex_compilation_unit.h"
21#include "handle_scope-inl.h"
22#include "nodes.h"
23#include "optimization.h"
24#include "optimizing_compiler_stats.h"
25
26namespace art {
27
28/**
29 * Propagates reference types to instructions.
30 */
31class ReferenceTypePropagation : public HOptimization {
32 public:
33  ReferenceTypePropagation(HGraph* graph,
34                           StackHandleScopeCollection* handles,
35                           const char* name = kReferenceTypePropagationPassName)
36    : HOptimization(graph, name),
37      handles_(handles),
38      worklist_(graph->GetArena(), kDefaultWorklistSize) {}
39
40  void Run() OVERRIDE;
41
42  static constexpr const char* kReferenceTypePropagationPassName = "reference_type_propagation";
43
44 private:
45  void VisitPhi(HPhi* phi);
46  void VisitBasicBlock(HBasicBlock* block);
47  void UpdateBoundType(HBoundType* bound_type) SHARED_REQUIRES(Locks::mutator_lock_);
48  void UpdatePhi(HPhi* phi) SHARED_REQUIRES(Locks::mutator_lock_);
49  void BoundTypeForIfNotNull(HBasicBlock* block);
50  void BoundTypeForIfInstanceOf(HBasicBlock* block);
51  void ProcessWorklist();
52  void AddToWorklist(HInstruction* instr);
53  void AddDependentInstructionsToWorklist(HInstruction* instr);
54
55  bool UpdateNullability(HInstruction* instr);
56  bool UpdateReferenceTypeInfo(HInstruction* instr);
57
58  ReferenceTypeInfo MergeTypes(const ReferenceTypeInfo& a, const ReferenceTypeInfo& b)
59      SHARED_REQUIRES(Locks::mutator_lock_);
60
61  StackHandleScopeCollection* handles_;
62
63  GrowableArray<HInstruction*> worklist_;
64
65  static constexpr size_t kDefaultWorklistSize = 8;
66
67  DISALLOW_COPY_AND_ASSIGN(ReferenceTypePropagation);
68};
69
70}  // namespace art
71
72#endif  // ART_COMPILER_OPTIMIZING_REFERENCE_TYPE_PROPAGATION_H_
73