reference_type_propagation.h revision 2e76830f0b3f23825677436c0633714402715099 
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
37  void Run() OVERRIDE;
38
39  static constexpr const char* kReferenceTypePropagationPassName = "reference_type_propagation";
40
41 private:
42  void VisitPhi(HPhi* phi);
43  void VisitBasicBlock(HBasicBlock* block);
44  void UpdateBoundType(HBoundType* bound_type) SHARED_REQUIRES(Locks::mutator_lock_);
45  void UpdatePhi(HPhi* phi) SHARED_REQUIRES(Locks::mutator_lock_);
46  void BoundTypeForIfNotNull(HBasicBlock* block);
47  void BoundTypeForIfInstanceOf(HBasicBlock* block);
48  void ProcessWorklist();
49  void AddToWorklist(HInstruction* instr);
50  void AddDependentInstructionsToWorklist(HInstruction* instr);
51
52  bool UpdateNullability(HInstruction* instr);
53  bool UpdateReferenceTypeInfo(HInstruction* instr);
54
55  ReferenceTypeInfo MergeTypes(const ReferenceTypeInfo& a, const ReferenceTypeInfo& b)
56      SHARED_REQUIRES(Locks::mutator_lock_);
57
58  StackHandleScopeCollection* handles_;
59
60  GrowableArray<HInstruction*> worklist_;
61
62  ReferenceTypeInfo::TypeHandle object_class_handle_;
63  ReferenceTypeInfo::TypeHandle class_class_handle_;
64  ReferenceTypeInfo::TypeHandle string_class_handle_;
65
66  static constexpr size_t kDefaultWorklistSize = 8;
67
68  DISALLOW_COPY_AND_ASSIGN(ReferenceTypePropagation);
69};
70
71}  // namespace art
72
73#endif  // ART_COMPILER_OPTIMIZING_REFERENCE_TYPE_PROPAGATION_H_
74