1 /*
2 * Copyright (c) 2021 Huawei Device Co., Ltd.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at
6 *
7 * http://www.apache.org/licenses/LICENSE-2.0
8 *
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
14 */
15
16 #include "symbols_table.h"
17 #include "trace_data_cache.h"
18
19 namespace SysTuning {
20 namespace TraceStreamer {
21 enum Index { ID = 0, STR, ADDR };
SymbolsTable(const TraceDataCache * dataCache)22 SymbolsTable::SymbolsTable(const TraceDataCache* dataCache) : TableBase(dataCache)
23 {
24 tableColumn_.push_back(TableBase::ColumnInfo("id", "INTEGER"));
25 tableColumn_.push_back(TableBase::ColumnInfo("funcname", "TEXT"));
26 tableColumn_.push_back(TableBase::ColumnInfo("addr", "INTEGER"));
27 tablePriKey_.push_back("id");
28 }
29
~SymbolsTable()30 SymbolsTable::~SymbolsTable() {}
31
EstimateFilterCost(FilterConstraints & fc,EstimatedIndexInfo & ei)32 void SymbolsTable::EstimateFilterCost(FilterConstraints& fc, EstimatedIndexInfo& ei)
33 {
34 constexpr double filterBaseCost = 1000.0; // set-up and tear-down
35 constexpr double indexCost = 2.0;
36 ei.estimatedCost = filterBaseCost;
37
38 size_t rowCount = dataCache_->GetConstSymbolsData().Size();
39 if (rowCount == 0 || rowCount == 1) {
40 ei.estimatedRows = rowCount;
41 ei.estimatedCost += indexCost * rowCount;
42 return;
43 }
44
45 double filterCost = 0.0;
46 auto constraints = fc.GetConstraints();
47 if (constraints.empty()) { // scan all rows
48 filterCost = rowCount;
49 } else {
50 FilterByConstraint(fc, filterCost, rowCount);
51 }
52 ei.estimatedCost += filterCost;
53 ei.estimatedRows = rowCount;
54 ei.estimatedCost += rowCount * indexCost;
55
56 ei.isOrdered = true;
57 auto orderbys = fc.GetOrderBys();
58 for (auto i = 0; i < orderbys.size(); i++) {
59 switch (orderbys[i].iColumn) {
60 case ID:
61 break;
62 default: // other columns can be sorted by SQLite
63 ei.isOrdered = false;
64 break;
65 }
66 }
67 }
68
FilterByConstraint(FilterConstraints & fc,double & filterCost,size_t rowCount)69 void SymbolsTable::FilterByConstraint(FilterConstraints& fc, double& filterCost, size_t rowCount)
70 {
71 auto fcConstraints = fc.GetConstraints();
72 for (int32_t i = 0; i < static_cast<int32_t>(fcConstraints.size()); i++) {
73 if (rowCount <= 1) {
74 // only one row or nothing, needn't filter by constraint
75 filterCost += rowCount;
76 break;
77 }
78 const auto& c = fcConstraints[i];
79 switch (c.col) {
80 case ID: {
81 if (CanFilterId(c.op, rowCount)) {
82 fc.UpdateConstraint(i, true);
83 filterCost += 1; // id can position by 1 step
84 } else {
85 filterCost += rowCount; // scan all rows
86 }
87 break;
88 }
89 default: // other column
90 filterCost += rowCount; // scan all rows
91 break;
92 }
93 }
94 }
95
CreateCursor()96 std::unique_ptr<TableBase::Cursor> SymbolsTable::CreateCursor()
97 {
98 return std::make_unique<Cursor>(dataCache_, this);
99 }
100
Cursor(const TraceDataCache * dataCache,TableBase * table)101 SymbolsTable::Cursor::Cursor(const TraceDataCache* dataCache, TableBase* table)
102 : TableBase::Cursor(dataCache, table, static_cast<uint32_t>(dataCache->GetConstSymbolsData().Size()))
103 {
104 }
105
~Cursor()106 SymbolsTable::Cursor::~Cursor() {}
107
Filter(const FilterConstraints & fc,sqlite3_value ** argv)108 int32_t SymbolsTable::Cursor::Filter(const FilterConstraints& fc, sqlite3_value** argv)
109 {
110 // reset indexMap_
111 indexMap_ = std::make_unique<IndexMap>(0, rowCount_);
112
113 if (rowCount_ <= 0) {
114 return SQLITE_OK;
115 }
116
117 auto& cs = fc.GetConstraints();
118 for (size_t i = 0; i < cs.size(); i++) {
119 const auto& c = cs[i];
120 switch (c.col) {
121 case ID:
122 FilterId(c.op, argv[i]);
123 break;
124 default:
125 break;
126 }
127 }
128
129 auto orderbys = fc.GetOrderBys();
130 for (auto i = orderbys.size(); i > 0;) {
131 i--;
132 switch (orderbys[i].iColumn) {
133 case ID:
134 indexMap_->SortBy(orderbys[i].desc);
135 break;
136 default:
137 break;
138 }
139 }
140
141 return SQLITE_OK;
142 }
143
Column(int32_t col) const144 int32_t SymbolsTable::Cursor::Column(int32_t col) const
145 {
146 DataIndex index = static_cast<DataIndex>(CurrentRow());
147 switch (col) {
148 case ID:
149 sqlite3_result_int64(context_, static_cast<sqlite3_int64>(CurrentRow()));
150 break;
151 case STR:
152 sqlite3_result_text(
153 context_,
154 dataCache_->GetDataFromDict(dataCache_->GetConstSymbolsData().GetConstFuncNames()[index]).c_str(),
155 STR_DEFAULT_LEN, nullptr);
156 break;
157 case ADDR:
158 sqlite3_result_int64(context_,
159 static_cast<sqlite3_int64>(dataCache_->GetConstSymbolsData().GetConstAddrs()[index]));
160 break;
161 default:
162 TS_LOGF("Unknown column %d", col);
163 break;
164 }
165 return SQLITE_OK;
166 }
167 } // namespace TraceStreamer
168 } // namespace SysTuning
169