src/trace_processor/sqlite/sqlite_engine.cc

/*
 * Copyright (C) 2023 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_engine.h"
#include "src/trace_processor/sqlite/db_sqlite_table.h"
#include "src/trace_processor/sqlite/query_cache.h"

// In Android and Chromium tree builds, we don't have the percentile module.
// Just don't include it.
#if PERFETTO_BUILDFLAG(PERFETTO_TP_PERCENTILE)
// defined in sqlite_src/ext/misc/percentile.c
extern "C" int sqlite3_percentile_init(sqlite3* db,
                                       char** error,
                                       const sqlite3_api_routines* api);
#endif  // PERFETTO_BUILDFLAG(PERFETTO_TP_PERCENTILE)

namespace perfetto {
namespace trace_processor {
namespace {

void EnsureSqliteInitialized() {
  // sqlite3_initialize isn't actually thread-safe despite being documented
  // as such; we need to make sure multiple TraceProcessorImpl instances don't
  // call it concurrently and only gets called once per process, instead.
  static bool init_once = [] { return sqlite3_initialize() == SQLITE_OK; }();
  PERFETTO_CHECK(init_once);
}

void InitializeSqlite(sqlite3* db) {
  char* error = nullptr;
  sqlite3_exec(db, "PRAGMA temp_store=2", nullptr, nullptr, &error);
  if (error) {
    PERFETTO_FATAL("Error setting pragma temp_store: %s", error);
  }
// In Android tree builds, we don't have the percentile module.
// Just don't include it.
#if PERFETTO_BUILDFLAG(PERFETTO_TP_PERCENTILE)
  sqlite3_percentile_init(db, &error, nullptr);
  if (error) {
    PERFETTO_ELOG("Error initializing: %s", error);
    sqlite3_free(error);
  }
#endif
}

}  // namespace

SqliteEngine::SqliteEngine() : query_cache_(new QueryCache()) {
  sqlite3* db = nullptr;
  EnsureSqliteInitialized();
  PERFETTO_CHECK(sqlite3_open(":memory:", &db) == SQLITE_OK);
  InitializeSqlite(db);
  db_.reset(std::move(db));
}

void SqliteEngine::RegisterTable(const Table& table, const std::string& name) {
  DbSqliteTable::RegisterTable(*db_, query_cache_.get(), &table, name);
}

void SqliteEngine::RegisterTableFunction(std::unique_ptr<TableFunction> fn) {
  DbSqliteTable::RegisterTable(*db_, query_cache_.get(), std::move(fn));
}

}  // namespace trace_processor
}  // namespace perfetto