load_store_analysis.h revision fef2884b18bcc01cc40edb2ae809d42b5a510c33
1c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong/* 2c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong * Copyright (C) 2017 The Android Open Source Project 3c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong * 4c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong * Licensed under the Apache License, Version 2.0 (the "License"); 5c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong * you may not use this file except in compliance with the License. 6c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong * You may obtain a copy of the License at 7c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong * 8c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong * http://www.apache.org/licenses/LICENSE-2.0 9c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong * 10c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong * Unless required by applicable law or agreed to in writing, software 11c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong * distributed under the License is distributed on an "AS IS" BASIS, 12c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong * See the License for the specific language governing permissions and 14c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong * limitations under the License. 15c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong */ 16c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong 17c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong#ifndef ART_COMPILER_OPTIMIZING_LOAD_STORE_ANALYSIS_H_ 18c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong#define ART_COMPILER_OPTIMIZING_LOAD_STORE_ANALYSIS_H_ 19c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong 20c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong#include "escape.h" 21c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong#include "nodes.h" 22c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong#include "optimization.h" 23c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong 24c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhongnamespace art { 25c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong 26c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong// A ReferenceInfo contains additional info about a reference such as 27c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong// whether it's a singleton, returned, etc. 28c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhongclass ReferenceInfo : public ArenaObject<kArenaAllocMisc> { 29c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong public: 30c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong ReferenceInfo(HInstruction* reference, size_t pos) 31c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong : reference_(reference), 32c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong position_(pos), 33c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong is_singleton_(true), 34c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong is_singleton_and_not_returned_(true), 35c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong is_singleton_and_not_deopt_visible_(true), 36c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong has_index_aliasing_(false) { 37c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong CalculateEscape(reference_, 38c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong nullptr, 39c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong &is_singleton_, 40c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong &is_singleton_and_not_returned_, 41c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong &is_singleton_and_not_deopt_visible_); 42c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong } 43c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong 44c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong HInstruction* GetReference() const { 45c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong return reference_; 46c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong } 47c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong 48c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong size_t GetPosition() const { 49c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong return position_; 50c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong } 51c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong 52c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong // Returns true if reference_ is the only name that can refer to its value during 53c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong // the lifetime of the method. So it's guaranteed to not have any alias in 54c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong // the method (including its callees). 55c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong bool IsSingleton() const { 56c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong return is_singleton_; 57c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong } 58c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong 59c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong // Returns true if reference_ is a singleton and not returned to the caller or 60c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong // used as an environment local of an HDeoptimize instruction. 61c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong // The allocation and stores into reference_ may be eliminated for such cases. 62c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong bool IsSingletonAndRemovable() const { 63c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong return is_singleton_and_not_returned_ && is_singleton_and_not_deopt_visible_; 64c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong } 65c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong 66c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong // Returns true if reference_ is a singleton and returned to the caller or 67c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong // used as an environment local of an HDeoptimize instruction. 68c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong bool IsSingletonAndNonRemovable() const { 69c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong return is_singleton_ && 70c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong (!is_singleton_and_not_returned_ || !is_singleton_and_not_deopt_visible_); 71c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong } 72c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong 73c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong bool HasIndexAliasing() { 74c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong return has_index_aliasing_; 75c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong } 76c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong 77c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong void SetHasIndexAliasing(bool has_index_aliasing) { 78c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong // Only allow setting to true. 79c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong DCHECK(has_index_aliasing); 80c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong has_index_aliasing_ = has_index_aliasing; 81c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong } 82c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong 83c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong private: 84c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong HInstruction* const reference_; 85c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong const size_t position_; // position in HeapLocationCollector's ref_info_array_. 86c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong 87c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong // Can only be referred to by a single name in the method. 88c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong bool is_singleton_; 89c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong // Is singleton and not returned to caller. 90c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong bool is_singleton_and_not_returned_; 91c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong // Is singleton and not used as an environment local of HDeoptimize. 92c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong bool is_singleton_and_not_deopt_visible_; 93c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong // Some heap locations with reference_ have array index aliasing, 94c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong // e.g. arr[i] and arr[j] may be the same location. 95c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong bool has_index_aliasing_; 96c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong 97c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong DISALLOW_COPY_AND_ASSIGN(ReferenceInfo); 98c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong}; 99c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong 100c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong// A heap location is a reference-offset/index pair that a value can be loaded from 101c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong// or stored to. 102c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhongclass HeapLocation : public ArenaObject<kArenaAllocMisc> { 103c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong public: 104c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong static constexpr size_t kInvalidFieldOffset = -1; 105c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong 106c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong // TODO: more fine-grained array types. 107c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong static constexpr int16_t kDeclaringClassDefIndexForArrays = -1; 108c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong 109c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong HeapLocation(ReferenceInfo* ref_info, 110c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong size_t offset, 111c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong HInstruction* index, 112c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong int16_t declaring_class_def_index) 113c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong : ref_info_(ref_info), 114c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong offset_(offset), 115c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong index_(index), 116c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong declaring_class_def_index_(declaring_class_def_index), 117c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong value_killed_by_loop_side_effects_(true) { 118c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong DCHECK(ref_info != nullptr); 119c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong DCHECK((offset == kInvalidFieldOffset && index != nullptr) || 120c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong (offset != kInvalidFieldOffset && index == nullptr)); 121c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong if (ref_info->IsSingleton() && !IsArrayElement()) { 122c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong // Assume this location's value cannot be killed by loop side effects 123c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong // until proven otherwise. 124c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong value_killed_by_loop_side_effects_ = false; 125c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong } 126c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong } 127c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong 128c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong ReferenceInfo* GetReferenceInfo() const { return ref_info_; } 129c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong size_t GetOffset() const { return offset_; } 130c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong HInstruction* GetIndex() const { return index_; } 131c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong 132c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong // Returns the definition of declaring class' dex index. 133c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong // It's kDeclaringClassDefIndexForArrays for an array element. 134c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong int16_t GetDeclaringClassDefIndex() const { 135c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong return declaring_class_def_index_; 136c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong } 137c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong 138c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong bool IsArrayElement() const { 139c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong return index_ != nullptr; 140c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong } 141c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong 142c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong bool IsValueKilledByLoopSideEffects() const { 143c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong return value_killed_by_loop_side_effects_; 144c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong } 145c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong 146c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong void SetValueKilledByLoopSideEffects(bool val) { 147c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong value_killed_by_loop_side_effects_ = val; 148c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong } 149c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong 150c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong private: 151c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong ReferenceInfo* const ref_info_; // reference for instance/static field or array access. 152c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong const size_t offset_; // offset of static/instance field. 153c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong HInstruction* const index_; // index of an array element. 154c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong const int16_t declaring_class_def_index_; // declaring class's def's dex index. 155c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong bool value_killed_by_loop_side_effects_; // value of this location may be killed by loop 156c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong // side effects because this location is stored 157c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong // into inside a loop. This gives 158c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong // better info on whether a singleton's location 159c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong // value may be killed by loop side effects. 160c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong 161c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong DISALLOW_COPY_AND_ASSIGN(HeapLocation); 162c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong}; 163c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong 164c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong// A HeapLocationCollector collects all relevant heap locations and keeps 165c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong// an aliasing matrix for all locations. 166c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhongclass HeapLocationCollector : public HGraphVisitor { 167c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong public: 168c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong static constexpr size_t kHeapLocationNotFound = -1; 169c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong // Start with a single uint32_t word. That's enough bits for pair-wise 170c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong // aliasing matrix of 8 heap locations. 171c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong static constexpr uint32_t kInitialAliasingMatrixBitVectorSize = 32; 172c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong 173c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong explicit HeapLocationCollector(HGraph* graph) 174c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong : HGraphVisitor(graph), 175c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong ref_info_array_(graph->GetArena()->Adapter(kArenaAllocLSE)), 176c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong heap_locations_(graph->GetArena()->Adapter(kArenaAllocLSE)), 177c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong aliasing_matrix_(graph->GetArena(), 178c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong kInitialAliasingMatrixBitVectorSize, 179c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong true, 180c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong kArenaAllocLSE), 181c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong has_heap_stores_(false), 182c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong has_volatile_(false), 183c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong has_monitor_operations_(false) {} 184c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong 185c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong void CleanUp() { 186c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong heap_locations_.clear(); 187c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong ref_info_array_.clear(); 188c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong } 189c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong 190c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong size_t GetNumberOfHeapLocations() const { 191c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong return heap_locations_.size(); 192c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong } 193c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong 194c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong HeapLocation* GetHeapLocation(size_t index) const { 195c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong return heap_locations_[index]; 196c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong } 197c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong 198c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong HInstruction* HuntForOriginalReference(HInstruction* ref) const { 199c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong DCHECK(ref != nullptr); 200c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong while (ref->IsNullCheck() || ref->IsBoundType()) { 201c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong ref = ref->InputAt(0); 202c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong } 203c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong return ref; 204c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong } 205c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong 206c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong ReferenceInfo* FindReferenceInfoOf(HInstruction* ref) const { 207c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong for (size_t i = 0; i < ref_info_array_.size(); i++) { 208c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong ReferenceInfo* ref_info = ref_info_array_[i]; 209c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong if (ref_info->GetReference() == ref) { 210c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong DCHECK_EQ(i, ref_info->GetPosition()); 211c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong return ref_info; 212c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong } 213c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong } 214c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong return nullptr; 215c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong } 216c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong 217016c0f165dc6872d22c12c239d19b094983519f1xueliang.zhong size_t GetArrayAccessHeapLocation(HInstruction* array, HInstruction* index) const { 218016c0f165dc6872d22c12c239d19b094983519f1xueliang.zhong DCHECK(array != nullptr); 219016c0f165dc6872d22c12c239d19b094983519f1xueliang.zhong DCHECK(index != nullptr); 220016c0f165dc6872d22c12c239d19b094983519f1xueliang.zhong HInstruction* original_ref = HuntForOriginalReference(array); 221016c0f165dc6872d22c12c239d19b094983519f1xueliang.zhong ReferenceInfo* ref_info = FindReferenceInfoOf(original_ref); 222016c0f165dc6872d22c12c239d19b094983519f1xueliang.zhong return FindHeapLocationIndex(ref_info, 223016c0f165dc6872d22c12c239d19b094983519f1xueliang.zhong HeapLocation::kInvalidFieldOffset, 224016c0f165dc6872d22c12c239d19b094983519f1xueliang.zhong index, 225016c0f165dc6872d22c12c239d19b094983519f1xueliang.zhong HeapLocation::kDeclaringClassDefIndexForArrays); 226016c0f165dc6872d22c12c239d19b094983519f1xueliang.zhong } 227016c0f165dc6872d22c12c239d19b094983519f1xueliang.zhong 228c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong bool HasHeapStores() const { 229c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong return has_heap_stores_; 230c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong } 231c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong 232c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong bool HasVolatile() const { 233c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong return has_volatile_; 234c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong } 235c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong 236c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong bool HasMonitorOps() const { 237c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong return has_monitor_operations_; 238c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong } 239c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong 240c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong // Find and return the heap location index in heap_locations_. 241c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong size_t FindHeapLocationIndex(ReferenceInfo* ref_info, 242c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong size_t offset, 243c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong HInstruction* index, 244c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong int16_t declaring_class_def_index) const { 245c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong for (size_t i = 0; i < heap_locations_.size(); i++) { 246c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong HeapLocation* loc = heap_locations_[i]; 247c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong if (loc->GetReferenceInfo() == ref_info && 248c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong loc->GetOffset() == offset && 249c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong loc->GetIndex() == index && 250c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong loc->GetDeclaringClassDefIndex() == declaring_class_def_index) { 251c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong return i; 252c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong } 253c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong } 254c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong return kHeapLocationNotFound; 255c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong } 256c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong 257c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong // Returns true if heap_locations_[index1] and heap_locations_[index2] may alias. 258c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong bool MayAlias(size_t index1, size_t index2) const { 259c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong if (index1 < index2) { 260c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong return aliasing_matrix_.IsBitSet(AliasingMatrixPosition(index1, index2)); 261c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong } else if (index1 > index2) { 262c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong return aliasing_matrix_.IsBitSet(AliasingMatrixPosition(index2, index1)); 263c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong } else { 264c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong DCHECK(false) << "index1 and index2 are expected to be different"; 265c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong return true; 266c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong } 267c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong } 268c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong 269c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong void BuildAliasingMatrix() { 270c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong const size_t number_of_locations = heap_locations_.size(); 271c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong if (number_of_locations == 0) { 272c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong return; 273c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong } 274c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong size_t pos = 0; 275c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong // Compute aliasing info between every pair of different heap locations. 276c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong // Save the result in a matrix represented as a BitVector. 277c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong for (size_t i = 0; i < number_of_locations - 1; i++) { 278c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong for (size_t j = i + 1; j < number_of_locations; j++) { 279c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong if (ComputeMayAlias(i, j)) { 280c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong aliasing_matrix_.SetBit(CheckedAliasingMatrixPosition(i, j, pos)); 281c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong } 282c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong pos++; 283c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong } 284c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong } 285c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong } 286c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong 287c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong private: 288c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong // An allocation cannot alias with a name which already exists at the point 289c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong // of the allocation, such as a parameter or a load happening before the allocation. 290c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong bool MayAliasWithPreexistenceChecking(ReferenceInfo* ref_info1, ReferenceInfo* ref_info2) const { 291c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong if (ref_info1->GetReference()->IsNewInstance() || ref_info1->GetReference()->IsNewArray()) { 292c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong // Any reference that can alias with the allocation must appear after it in the block/in 293c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong // the block's successors. In reverse post order, those instructions will be visited after 294c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong // the allocation. 295c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong return ref_info2->GetPosition() >= ref_info1->GetPosition(); 296c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong } 297c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong return true; 298c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong } 299c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong 300c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong bool CanReferencesAlias(ReferenceInfo* ref_info1, ReferenceInfo* ref_info2) const { 301c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong if (ref_info1 == ref_info2) { 302c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong return true; 303c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong } else if (ref_info1->IsSingleton()) { 304c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong return false; 305c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong } else if (ref_info2->IsSingleton()) { 306c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong return false; 307c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong } else if (!MayAliasWithPreexistenceChecking(ref_info1, ref_info2) || 308c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong !MayAliasWithPreexistenceChecking(ref_info2, ref_info1)) { 309c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong return false; 310c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong } 311c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong return true; 312c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong } 313c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong 314016c0f165dc6872d22c12c239d19b094983519f1xueliang.zhong bool CanArrayIndicesAlias(const HInstruction* i1, const HInstruction* i2) const; 315016c0f165dc6872d22c12c239d19b094983519f1xueliang.zhong 316c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong // `index1` and `index2` are indices in the array of collected heap locations. 317c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong // Returns the position in the bit vector that tracks whether the two heap 318c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong // locations may alias. 319c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong size_t AliasingMatrixPosition(size_t index1, size_t index2) const { 320c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong DCHECK(index2 > index1); 321c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong const size_t number_of_locations = heap_locations_.size(); 322c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong // It's (num_of_locations - 1) + ... + (num_of_locations - index1) + (index2 - index1 - 1). 323c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong return (number_of_locations * index1 - (1 + index1) * index1 / 2 + (index2 - index1 - 1)); 324c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong } 325c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong 326c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong // An additional position is passed in to make sure the calculated position is correct. 327c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong size_t CheckedAliasingMatrixPosition(size_t index1, size_t index2, size_t position) { 328c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong size_t calculated_position = AliasingMatrixPosition(index1, index2); 329c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong DCHECK_EQ(calculated_position, position); 330c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong return calculated_position; 331c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong } 332c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong 333c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong // Compute if two locations may alias to each other. 334c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong bool ComputeMayAlias(size_t index1, size_t index2) const { 335c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong HeapLocation* loc1 = heap_locations_[index1]; 336c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong HeapLocation* loc2 = heap_locations_[index2]; 337c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong if (loc1->GetOffset() != loc2->GetOffset()) { 338c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong // Either two different instance fields, or one is an instance 339c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong // field and the other is an array element. 340c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong return false; 341c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong } 342c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong if (loc1->GetDeclaringClassDefIndex() != loc2->GetDeclaringClassDefIndex()) { 343c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong // Different types. 344c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong return false; 345c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong } 346c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong if (!CanReferencesAlias(loc1->GetReferenceInfo(), loc2->GetReferenceInfo())) { 347c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong return false; 348c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong } 349c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong if (loc1->IsArrayElement() && loc2->IsArrayElement()) { 350c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong HInstruction* array_index1 = loc1->GetIndex(); 351c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong HInstruction* array_index2 = loc2->GetIndex(); 352016c0f165dc6872d22c12c239d19b094983519f1xueliang.zhong if (!CanArrayIndicesAlias(array_index1, array_index2)) { 353c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong return false; 354c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong } 355c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong ReferenceInfo* ref_info = loc1->GetReferenceInfo(); 356c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong ref_info->SetHasIndexAliasing(true); 357c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong } 358c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong return true; 359c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong } 360c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong 361c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong ReferenceInfo* GetOrCreateReferenceInfo(HInstruction* instruction) { 362c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong ReferenceInfo* ref_info = FindReferenceInfoOf(instruction); 363c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong if (ref_info == nullptr) { 364c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong size_t pos = ref_info_array_.size(); 365c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong ref_info = new (GetGraph()->GetArena()) ReferenceInfo(instruction, pos); 366c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong ref_info_array_.push_back(ref_info); 367c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong } 368c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong return ref_info; 369c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong } 370c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong 371c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong void CreateReferenceInfoForReferenceType(HInstruction* instruction) { 372c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong if (instruction->GetType() != Primitive::kPrimNot) { 373c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong return; 374c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong } 375c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong DCHECK(FindReferenceInfoOf(instruction) == nullptr); 376c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong GetOrCreateReferenceInfo(instruction); 377c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong } 378c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong 379c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong HeapLocation* GetOrCreateHeapLocation(HInstruction* ref, 380c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong size_t offset, 381c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong HInstruction* index, 382c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong int16_t declaring_class_def_index) { 383c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong HInstruction* original_ref = HuntForOriginalReference(ref); 384c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong ReferenceInfo* ref_info = GetOrCreateReferenceInfo(original_ref); 385c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong size_t heap_location_idx = FindHeapLocationIndex( 386c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong ref_info, offset, index, declaring_class_def_index); 387c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong if (heap_location_idx == kHeapLocationNotFound) { 388c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong HeapLocation* heap_loc = new (GetGraph()->GetArena()) 389c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong HeapLocation(ref_info, offset, index, declaring_class_def_index); 390c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong heap_locations_.push_back(heap_loc); 391c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong return heap_loc; 392c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong } 393c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong return heap_locations_[heap_location_idx]; 394c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong } 395c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong 396c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong HeapLocation* VisitFieldAccess(HInstruction* ref, const FieldInfo& field_info) { 397c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong if (field_info.IsVolatile()) { 398c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong has_volatile_ = true; 399c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong } 400c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong const uint16_t declaring_class_def_index = field_info.GetDeclaringClassDefIndex(); 401c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong const size_t offset = field_info.GetFieldOffset().SizeValue(); 402c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong return GetOrCreateHeapLocation(ref, offset, nullptr, declaring_class_def_index); 403c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong } 404c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong 405c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong void VisitArrayAccess(HInstruction* array, HInstruction* index) { 406c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong GetOrCreateHeapLocation(array, HeapLocation::kInvalidFieldOffset, 407c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong index, HeapLocation::kDeclaringClassDefIndexForArrays); 408c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong } 409c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong 410c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong void VisitInstanceFieldGet(HInstanceFieldGet* instruction) OVERRIDE { 411c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong VisitFieldAccess(instruction->InputAt(0), instruction->GetFieldInfo()); 412c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong CreateReferenceInfoForReferenceType(instruction); 413c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong } 414c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong 415c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong void VisitInstanceFieldSet(HInstanceFieldSet* instruction) OVERRIDE { 416c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong HeapLocation* location = VisitFieldAccess(instruction->InputAt(0), instruction->GetFieldInfo()); 417c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong has_heap_stores_ = true; 418c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong if (location->GetReferenceInfo()->IsSingleton()) { 419c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong // A singleton's location value may be killed by loop side effects if it's 420c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong // defined before that loop, and it's stored into inside that loop. 421c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong HLoopInformation* loop_info = instruction->GetBlock()->GetLoopInformation(); 422c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong if (loop_info != nullptr) { 423c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong HInstruction* ref = location->GetReferenceInfo()->GetReference(); 424c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong DCHECK(ref->IsNewInstance()); 425c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong if (loop_info->IsDefinedOutOfTheLoop(ref)) { 426c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong // ref's location value may be killed by this loop's side effects. 427c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong location->SetValueKilledByLoopSideEffects(true); 428c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong } else { 429c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong // ref is defined inside this loop so this loop's side effects cannot 430c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong // kill its location value at the loop header since ref/its location doesn't 431c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong // exist yet at the loop header. 432c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong } 433c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong } 434c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong } else { 435c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong // For non-singletons, value_killed_by_loop_side_effects_ is inited to 436c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong // true. 437c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong DCHECK_EQ(location->IsValueKilledByLoopSideEffects(), true); 438c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong } 439c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong } 440c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong 441c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong void VisitStaticFieldGet(HStaticFieldGet* instruction) OVERRIDE { 442c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong VisitFieldAccess(instruction->InputAt(0), instruction->GetFieldInfo()); 443c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong CreateReferenceInfoForReferenceType(instruction); 444c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong } 445c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong 446c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong void VisitStaticFieldSet(HStaticFieldSet* instruction) OVERRIDE { 447c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong VisitFieldAccess(instruction->InputAt(0), instruction->GetFieldInfo()); 448c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong has_heap_stores_ = true; 449c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong } 450c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong 451c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong // We intentionally don't collect HUnresolvedInstanceField/HUnresolvedStaticField accesses 452c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong // since we cannot accurately track the fields. 453c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong 454c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong void VisitArrayGet(HArrayGet* instruction) OVERRIDE { 455c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong VisitArrayAccess(instruction->InputAt(0), instruction->InputAt(1)); 456c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong CreateReferenceInfoForReferenceType(instruction); 457c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong } 458c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong 459c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong void VisitArraySet(HArraySet* instruction) OVERRIDE { 460c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong VisitArrayAccess(instruction->InputAt(0), instruction->InputAt(1)); 461c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong has_heap_stores_ = true; 462c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong } 463c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong 464fef2884b18bcc01cc40edb2ae809d42b5a510c33Mingyao Yang void VisitInstruction(HInstruction* instruction) OVERRIDE { 465fef2884b18bcc01cc40edb2ae809d42b5a510c33Mingyao Yang // Any new-instance or new-array cannot alias with references that 466fef2884b18bcc01cc40edb2ae809d42b5a510c33Mingyao Yang // pre-exist the new-instance/new-array. We append entries into 467fef2884b18bcc01cc40edb2ae809d42b5a510c33Mingyao Yang // ref_info_array_ which keeps track of the order of creation 468fef2884b18bcc01cc40edb2ae809d42b5a510c33Mingyao Yang // of reference values since we visit the blocks in reverse post order. 469fef2884b18bcc01cc40edb2ae809d42b5a510c33Mingyao Yang // 470fef2884b18bcc01cc40edb2ae809d42b5a510c33Mingyao Yang // By default, VisitXXX() (including VisitPhi()) calls VisitInstruction(), 471fef2884b18bcc01cc40edb2ae809d42b5a510c33Mingyao Yang // unless VisitXXX() is overridden. VisitInstanceFieldGet() etc. above 472fef2884b18bcc01cc40edb2ae809d42b5a510c33Mingyao Yang // also call CreateReferenceInfoForReferenceType() explicitly. 473c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong CreateReferenceInfoForReferenceType(instruction); 474c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong } 475c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong 476c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong void VisitMonitorOperation(HMonitorOperation* monitor ATTRIBUTE_UNUSED) OVERRIDE { 477c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong has_monitor_operations_ = true; 478c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong } 479c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong 480c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong ArenaVector<ReferenceInfo*> ref_info_array_; // All references used for heap accesses. 481c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong ArenaVector<HeapLocation*> heap_locations_; // All heap locations. 482c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong ArenaBitVector aliasing_matrix_; // aliasing info between each pair of locations. 483c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong bool has_heap_stores_; // If there is no heap stores, LSE acts as GVN with better 484c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong // alias analysis and won't be as effective. 485c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong bool has_volatile_; // If there are volatile field accesses. 486c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong bool has_monitor_operations_; // If there are monitor operations. 487c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong 488c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong DISALLOW_COPY_AND_ASSIGN(HeapLocationCollector); 489c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong}; 490c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong 491c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhongclass LoadStoreAnalysis : public HOptimization { 492c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong public: 493c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong explicit LoadStoreAnalysis(HGraph* graph) 494c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong : HOptimization(graph, kLoadStoreAnalysisPassName), 495c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong heap_location_collector_(graph) {} 496c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong 497c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong const HeapLocationCollector& GetHeapLocationCollector() const { 498c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong return heap_location_collector_; 499c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong } 500c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong 501c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong void Run() OVERRIDE; 502c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong 503c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong static constexpr const char* kLoadStoreAnalysisPassName = "load_store_analysis"; 504c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong 505c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong private: 506c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong HeapLocationCollector heap_location_collector_; 507c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong 508c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong DISALLOW_COPY_AND_ASSIGN(LoadStoreAnalysis); 509c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong}; 510c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong 511c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong} // namespace art 512c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong 513c239a2bb9474a1266c4882638fdb19056370e16dxueliang.zhong#endif // ART_COMPILER_OPTIMIZING_LOAD_STORE_ANALYSIS_H_ 514