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