reference_type_propagation.h revision 4e5dd521063beae1706410419f19c7e224db50fe
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 // Run the type propagation and propagate information only for the 40 // instructions dominated by `start_from`. 41 void Run(HInstruction* start_from); 42 43 static constexpr const char* kReferenceTypePropagationPassName = "reference_type_propagation"; 44 45 private: 46 void VisitPhi(HPhi* phi); 47 void VisitBasicBlock(HBasicBlock* block); 48 void UpdateBoundType(HBoundType* bound_type) SHARED_REQUIRES(Locks::mutator_lock_); 49 void UpdatePhi(HPhi* phi) SHARED_REQUIRES(Locks::mutator_lock_); 50 void BoundTypeForIfNotNull(HBasicBlock* block); 51 void BoundTypeForIfInstanceOf(HBasicBlock* block); 52 void ProcessWorklist(); 53 void AddToWorklist(HInstruction* instr); 54 void AddDependentInstructionsToWorklist(HInstruction* instr); 55 56 bool UpdateNullability(HInstruction* instr); 57 bool UpdateReferenceTypeInfo(HInstruction* instr); 58 59 ReferenceTypeInfo MergeTypes(const ReferenceTypeInfo& a, const ReferenceTypeInfo& b) 60 SHARED_REQUIRES(Locks::mutator_lock_); 61 62 void ValidateTypes(); 63 64 StackHandleScopeCollection* handles_; 65 66 ArenaVector<HInstruction*> worklist_; 67 68 ReferenceTypeInfo::TypeHandle object_class_handle_; 69 ReferenceTypeInfo::TypeHandle class_class_handle_; 70 ReferenceTypeInfo::TypeHandle string_class_handle_; 71 ReferenceTypeInfo::TypeHandle throwable_class_handle_; 72 73 static constexpr size_t kDefaultWorklistSize = 8; 74 75 DISALLOW_COPY_AND_ASSIGN(ReferenceTypePropagation); 76}; 77 78} // namespace art 79 80#endif // ART_COMPILER_OPTIMIZING_REFERENCE_TYPE_PROPAGATION_H_ 81