reference_type_propagation.h revision 7733bd644ac71f86d4b30a319624b23343882e53
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 StackHandleScopeCollection* handles, 35 const char* name = kReferenceTypePropagationPassName) 36 : HOptimization(graph, name), 37 handles_(handles), 38 worklist_(graph->GetArena(), kDefaultWorklistSize) {} 39 40 void Run() OVERRIDE; 41 42 static constexpr const char* kReferenceTypePropagationPassName = "reference_type_propagation"; 43 44 private: 45 void VisitPhi(HPhi* phi); 46 void VisitBasicBlock(HBasicBlock* block); 47 void UpdateBoundType(HBoundType* bound_type) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 48 void UpdatePhi(HPhi* phi) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 49 void BoundTypeForIfNotNull(HBasicBlock* block); 50 void BoundTypeForIfInstanceOf(HBasicBlock* block); 51 void ProcessWorklist(); 52 void AddToWorklist(HInstruction* instr); 53 void AddDependentInstructionsToWorklist(HInstruction* instr); 54 55 bool UpdateNullability(HInstruction* instr); 56 bool UpdateReferenceTypeInfo(HInstruction* instr); 57 58 ReferenceTypeInfo MergeTypes(const ReferenceTypeInfo& a, const ReferenceTypeInfo& b) 59 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 60 61 StackHandleScopeCollection* handles_; 62 63 GrowableArray<HInstruction*> worklist_; 64 65 static constexpr size_t kDefaultWorklistSize = 8; 66 67 DISALLOW_COPY_AND_ASSIGN(ReferenceTypePropagation); 68}; 69 70} // namespace art 71 72#endif // ART_COMPILER_OPTIMIZING_REFERENCE_TYPE_PROPAGATION_H_ 73