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/*
* Copyright (C) 2018 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "src/trace_processor/sqlite/sqlite_table.h"
#include <ctype.h>
#include <string.h>
#include <algorithm>
#include "perfetto/base/logging.h"
namespace perfetto {
namespace trace_processor {
namespace {
std::string TypeToString(SqlValue::Type type) {
switch (type) {
case SqlValue::Type::kString:
return "STRING";
case SqlValue::Type::kLong:
return "BIG INT";
case SqlValue::Type::kDouble:
return "DOUBLE";
case SqlValue::Type::kBytes:
return "BLOB";
case SqlValue::Type::kNull:
PERFETTO_FATAL("Cannot map unknown column type");
}
PERFETTO_FATAL("Not reached"); // For gcc
}
} // namespace
// static
bool SqliteTable::debug = false;
SqliteTable::SqliteTable() = default;
SqliteTable::~SqliteTable() = default;
int SqliteTable::OpenInternal(sqlite3_vtab_cursor** ppCursor) {
// Freed in xClose().
*ppCursor = static_cast<sqlite3_vtab_cursor*>(CreateCursor().release());
return SQLITE_OK;
}
int SqliteTable::BestIndexInternal(sqlite3_index_info* idx) {
using ConstraintInfo = BestIndexInfo::ConstraintInfo;
QueryConstraints in_qc;
BestIndexInfo info;
for (int i = 0; i < idx->nConstraint; i++) {
const auto& cs = idx->aConstraint[i];
if (!cs.usable)
continue;
in_qc.AddConstraint(cs.iColumn, cs.op);
ConstraintInfo c_info;
c_info.qc_idx = static_cast<uint32_t>(in_qc.constraints().size() - 1);
info.constraint_info.emplace_back(c_info);
}
for (int i = 0; i < idx->nOrderBy; i++) {
int column = idx->aOrderBy[i].iColumn;
bool desc = idx->aOrderBy[i].desc;
in_qc.AddOrderBy(column, desc);
}
int ret = BestIndex(in_qc, &info);
if (ret != SQLITE_OK)
return ret;
auto& cs_info = info.constraint_info;
// Remove all the pruned terms from the constraints.
{
auto prune_fn = [](const ConstraintInfo& t) { return t.prune; };
auto prune_cs_it = std::remove_if(cs_info.begin(), cs_info.end(), prune_fn);
cs_info.erase(prune_cs_it, cs_info.end());
}
idx->orderByConsumed = info.prune_order_by || info.sqlite_omit_order_by;
idx->estimatedCost = info.estimated_cost;
uint32_t in_qc_idx = 0;
for (int i = 0; i < idx->nConstraint; i++) {
const auto& c = idx->aConstraint[i];
if (c.usable) {
auto cs_fn = [in_qc_idx](const ConstraintInfo& t) {
return t.qc_idx == in_qc_idx;
};
auto it = std::find_if(cs_info.begin(), cs_info.end(), cs_fn);
// If the iterator no longer exists, we must have pruned it.
if (it == cs_info.end()) {
idx->aConstraintUsage[i].omit = true;
} else {
idx->aConstraintUsage[i].argvIndex =
static_cast<int>(std::distance(cs_info.begin(), it)) + 1;
idx->aConstraintUsage[i].omit = it->sqlite_omit;
}
in_qc_idx++;
}
}
QueryConstraints out_qc;
for (const auto& c_info : cs_info) {
const auto& c = in_qc.constraints()[c_info.qc_idx];
out_qc.AddConstraint(c.iColumn, c.op);
}
if (!info.prune_order_by) {
for (const auto& o : in_qc.order_by()) {
out_qc.AddOrderBy(o.iColumn, o.desc);
}
}
auto out_qc_str = out_qc.ToNewSqlite3String();
if (SqliteTable::debug) {
PERFETTO_LOG(
"[%s::BestIndex] constraints=%s orderByConsumed=%d estimatedCost=%d",
name_.c_str(), out_qc_str.get(), idx->orderByConsumed,
info.estimated_cost);
}
idx->idxStr = out_qc_str.release();
idx->needToFreeIdxStr = true;
idx->idxNum = ++best_index_num_;
return SQLITE_OK;
}
int SqliteTable::FindFunction(const char*, FindFunctionFn, void**) {
return 0;
}
int SqliteTable::Update(int, sqlite3_value**, sqlite3_int64*) {
return SQLITE_READONLY;
}
const QueryConstraints& SqliteTable::ParseConstraints(int idxNum,
const char* idxStr,
int argc) {
bool cache_hit = true;
if (idxNum != qc_hash_) {
qc_cache_ = QueryConstraints::FromString(idxStr);
qc_hash_ = idxNum;
cache_hit = false;
}
if (SqliteTable::debug) {
PERFETTO_LOG("[%s::ParseConstraints] constraints=%s argc=%d cache_hit=%d",
name_.c_str(), idxStr, argc, cache_hit);
}
return qc_cache_;
}
SqliteTable::Cursor::Cursor(SqliteTable* table) : table_(table) {
// This is required to prevent us from leaving this field uninitialised if
// we ever move construct the Cursor.
pVtab = table;
}
SqliteTable::Cursor::~Cursor() = default;
int SqliteTable::Cursor::RowId(sqlite3_int64*) {
return SQLITE_ERROR;
}
SqliteTable::Column::Column(size_t index,
std::string name,
SqlValue::Type type,
bool hidden)
: index_(index), name_(name), type_(type), hidden_(hidden) {}
SqliteTable::Schema::Schema(std::vector<Column> columns,
std::vector<size_t> primary_keys)
: columns_(std::move(columns)), primary_keys_(std::move(primary_keys)) {
for (size_t i = 0; i < columns_.size(); i++) {
PERFETTO_CHECK(columns_[i].index() == i);
}
for (auto key : primary_keys_) {
PERFETTO_CHECK(key < columns_.size());
}
}
SqliteTable::Schema::Schema() = default;
SqliteTable::Schema::Schema(const Schema&) = default;
SqliteTable::Schema& SqliteTable::Schema::operator=(const Schema&) = default;
std::string SqliteTable::Schema::ToCreateTableStmt() const {
std::string stmt = "CREATE TABLE x(";
for (size_t i = 0; i < columns_.size(); ++i) {
const Column& col = columns_[i];
stmt += " " + col.name();
if (col.type() != SqlValue::Type::kNull) {
stmt += " " + TypeToString(col.type());
} else if (std::find(primary_keys_.begin(), primary_keys_.end(), i) !=
primary_keys_.end()) {
PERFETTO_FATAL("Unknown type for primary key column %s",
col.name().c_str());
}
if (col.hidden()) {
stmt += " HIDDEN";
}
stmt += ",";
}
stmt += " PRIMARY KEY(";
for (size_t i = 0; i < primary_keys_.size(); i++) {
if (i != 0)
stmt += ", ";
stmt += columns_[primary_keys_[i]].name();
}
stmt += ")) WITHOUT ROWID;";
return stmt;
}
} // namespace trace_processor
} // namespace perfetto
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