reference_type_propagation.h revision b1498f67b444c897fa8f1530777ef118e05aa631 
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                           const DexFile& dex_file,
35                           const DexCompilationUnit& dex_compilation_unit,
36                           StackHandleScopeCollection* handles)
37    : HOptimization(graph, true, "reference_type_propagation"),
38      dex_file_(dex_file),
39      dex_compilation_unit_(dex_compilation_unit),
40      handles_(handles),
41      worklist_(graph->GetArena(), kDefaultWorklistSize) {}
42
43  void Run() OVERRIDE;
44
45 private:
46  void VisitNewInstance(HNewInstance* new_instance);
47  void VisitLoadClass(HLoadClass* load_class);
48  void VisitPhi(HPhi* phi);
49  void VisitBasicBlock(HBasicBlock* block);
50
51  void UpdateBoundType(HBoundType* bound_type) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
52  void UpdatePhi(HPhi* phi) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
53
54  void BoundTypeForIfInstanceOf(HBasicBlock* block);
55
56  void ProcessWorklist();
57  void AddToWorklist(HInstruction* instr);
58  void AddDependentInstructionsToWorklist(HInstruction* instr);
59
60  bool UpdateNullability(HInstruction* instr);
61  bool UpdateReferenceTypeInfo(HInstruction* instr);
62
63  ReferenceTypeInfo MergeTypes(const ReferenceTypeInfo& a, const ReferenceTypeInfo& b)
64      SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
65
66  const DexFile& dex_file_;
67  const DexCompilationUnit& dex_compilation_unit_;
68  StackHandleScopeCollection* handles_;
69
70  GrowableArray<HInstruction*> worklist_;
71
72  static constexpr size_t kDefaultWorklistSize = 8;
73
74  DISALLOW_COPY_AND_ASSIGN(ReferenceTypePropagation);
75};
76
77}  // namespace art
78
79#endif  // ART_COMPILER_OPTIMIZING_REFERENCE_TYPE_PROPAGATION_H_
80