reference_type_propagation.h revision 7d1fbf38412078090e81e9d9fa502635d8541707 
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 "base/arena_containers.h"
21#include "driver/dex_compilation_unit.h"
22#include "handle_scope-inl.h"
23#include "nodes.h"
24#include "optimization.h"
25#include "optimizing_compiler_stats.h"
26
27namespace art {
28
29/**
30 * Propagates reference types to instructions.
31 */
32class ReferenceTypePropagation : public HOptimization {
33 public:
34  ReferenceTypePropagation(HGraph* graph,
35                           StackHandleScopeCollection* handles,
36                           const char* name = kReferenceTypePropagationPassName);
37
38  void Run() OVERRIDE;
39
40  static constexpr const char* kReferenceTypePropagationPassName = "reference_type_propagation";
41
42 private:
43  class HandleCache {
44   public:
45    explicit HandleCache(StackHandleScopeCollection* handles) : handles_(handles) { }
46
47    template <typename T>
48    MutableHandle<T> NewHandle(T* object) SHARED_REQUIRES(Locks::mutator_lock_) {
49      return handles_->NewHandle(object);
50    }
51
52    ReferenceTypeInfo::TypeHandle GetObjectClassHandle();
53    ReferenceTypeInfo::TypeHandle GetClassClassHandle();
54    ReferenceTypeInfo::TypeHandle GetStringClassHandle();
55    ReferenceTypeInfo::TypeHandle GetThrowableClassHandle();
56
57   private:
58    StackHandleScopeCollection* handles_;
59
60    ReferenceTypeInfo::TypeHandle object_class_handle_;
61    ReferenceTypeInfo::TypeHandle class_class_handle_;
62    ReferenceTypeInfo::TypeHandle string_class_handle_;
63    ReferenceTypeInfo::TypeHandle throwable_class_handle_;
64  };
65
66  class RTPVisitor;
67
68  void VisitPhi(HPhi* phi);
69  void VisitBasicBlock(HBasicBlock* block);
70  void UpdateBoundType(HBoundType* bound_type) SHARED_REQUIRES(Locks::mutator_lock_);
71  void UpdatePhi(HPhi* phi) SHARED_REQUIRES(Locks::mutator_lock_);
72  void BoundTypeForIfNotNull(HBasicBlock* block);
73  void BoundTypeForIfInstanceOf(HBasicBlock* block);
74  void ProcessWorklist();
75  void AddToWorklist(HInstruction* instr);
76  void AddDependentInstructionsToWorklist(HInstruction* instr);
77
78  bool UpdateNullability(HInstruction* instr);
79  bool UpdateReferenceTypeInfo(HInstruction* instr);
80
81  static void UpdateArrayGet(HArrayGet* instr, HandleCache* handle_cache)
82      SHARED_REQUIRES(Locks::mutator_lock_);
83
84  ReferenceTypeInfo MergeTypes(const ReferenceTypeInfo& a, const ReferenceTypeInfo& b)
85      SHARED_REQUIRES(Locks::mutator_lock_);
86
87  void ValidateTypes();
88
89  HandleCache handle_cache_;
90
91  ArenaVector<HInstruction*> worklist_;
92
93
94  static constexpr size_t kDefaultWorklistSize = 8;
95
96  DISALLOW_COPY_AND_ASSIGN(ReferenceTypePropagation);
97};
98
99}  // namespace art
100
101#endif  // ART_COMPILER_OPTIMIZING_REFERENCE_TYPE_PROPAGATION_H_
102