reference_type_propagation.h revision 3398c7874e002beaa6c2b2fadf183e7d1ddad23a
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 "obj_ptr.h" 25#include "optimization.h" 26#include "optimizing_compiler_stats.h" 27 28namespace art { 29 30/** 31 * Propagates reference types to instructions. 32 */ 33class ReferenceTypePropagation : public HOptimization { 34 public: 35 ReferenceTypePropagation(HGraph* graph, 36 Handle<mirror::DexCache> hint_dex_cache, 37 StackHandleScopeCollection* handles, 38 bool is_first_run, 39 const char* name = kReferenceTypePropagationPassName); 40 41 // Visit a single instruction. 42 void Visit(HInstruction* instruction); 43 44 void Run() OVERRIDE; 45 46 // Returns true if klass is admissible to the propagation: non-null and resolved. 47 // For an array type, we also check if the component type is admissible. 48 static bool IsAdmissible(mirror::Class* klass) REQUIRES_SHARED(Locks::mutator_lock_) { 49 return klass != nullptr && 50 klass->IsResolved() && 51 (!klass->IsArrayClass() || IsAdmissible(klass->GetComponentType())); 52 } 53 54 static constexpr const char* kReferenceTypePropagationPassName = "reference_type_propagation"; 55 56 private: 57 class HandleCache { 58 public: 59 explicit HandleCache(StackHandleScopeCollection* handles) : handles_(handles) { } 60 61 template <typename T> 62 MutableHandle<T> NewHandle(T* object) REQUIRES_SHARED(Locks::mutator_lock_) { 63 return handles_->NewHandle(object); 64 } 65 66 template <typename T> 67 MutableHandle<T> NewHandle(ObjPtr<T> object) REQUIRES_SHARED(Locks::mutator_lock_) { 68 return handles_->NewHandle(object); 69 } 70 71 ReferenceTypeInfo::TypeHandle GetObjectClassHandle(); 72 ReferenceTypeInfo::TypeHandle GetClassClassHandle(); 73 ReferenceTypeInfo::TypeHandle GetStringClassHandle(); 74 ReferenceTypeInfo::TypeHandle GetThrowableClassHandle(); 75 76 private: 77 StackHandleScopeCollection* handles_; 78 79 ReferenceTypeInfo::TypeHandle object_class_handle_; 80 ReferenceTypeInfo::TypeHandle class_class_handle_; 81 ReferenceTypeInfo::TypeHandle string_class_handle_; 82 ReferenceTypeInfo::TypeHandle throwable_class_handle_; 83 }; 84 85 class RTPVisitor; 86 87 void VisitPhi(HPhi* phi); 88 void VisitBasicBlock(HBasicBlock* block); 89 void UpdateBoundType(HBoundType* bound_type) REQUIRES_SHARED(Locks::mutator_lock_); 90 void UpdatePhi(HPhi* phi) REQUIRES_SHARED(Locks::mutator_lock_); 91 void BoundTypeForIfNotNull(HBasicBlock* block); 92 void BoundTypeForIfInstanceOf(HBasicBlock* block); 93 void ProcessWorklist(); 94 void AddToWorklist(HInstruction* instr); 95 void AddDependentInstructionsToWorklist(HInstruction* instr); 96 97 bool UpdateNullability(HInstruction* instr); 98 bool UpdateReferenceTypeInfo(HInstruction* instr); 99 100 static void UpdateArrayGet(HArrayGet* instr, HandleCache* handle_cache) 101 REQUIRES_SHARED(Locks::mutator_lock_); 102 103 ReferenceTypeInfo MergeTypes(const ReferenceTypeInfo& a, const ReferenceTypeInfo& b) 104 REQUIRES_SHARED(Locks::mutator_lock_); 105 106 void ValidateTypes(); 107 108 // Note: hint_dex_cache_ is usually, but not necessarily, the dex cache associated with 109 // graph_->GetDexFile(). Since we may look up also in other dex files, it's used only 110 // as a hint, to reduce the number of calls to the costly ClassLinker::FindDexCache(). 111 Handle<mirror::DexCache> hint_dex_cache_; 112 HandleCache handle_cache_; 113 114 ArenaVector<HInstruction*> worklist_; 115 116 // Whether this reference type propagation is the first run we are doing. 117 const bool is_first_run_; 118 119 static constexpr size_t kDefaultWorklistSize = 8; 120 121 friend class ReferenceTypePropagationTest; 122 123 DISALLOW_COPY_AND_ASSIGN(ReferenceTypePropagation); 124}; 125 126} // namespace art 127 128#endif // ART_COMPILER_OPTIMIZING_REFERENCE_TYPE_PROPAGATION_H_ 129