tp: create prelude directory and move functions and operators
This CL creates the "prelude" directory for holding all the stuff which
is built into trace processor by default without needing to be imported.
Bug: 261195778
Change-Id: I79e8cfd02818512dd26a38c7a40d8896836fe5ab
diff --git a/src/trace_processor/prelude/functions/create_function.h b/src/trace_processor/prelude/functions/create_function.h
new file mode 100644
index 0000000..258c4bb
--- /dev/null
+++ b/src/trace_processor/prelude/functions/create_function.h
@@ -0,0 +1,69 @@
+/*
+ * Copyright (C) 2021 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.
+ */
+
+#ifndef SRC_TRACE_PROCESSOR_PRELUDE_FUNCTIONS_CREATE_FUNCTION_H_
+#define SRC_TRACE_PROCESSOR_PRELUDE_FUNCTIONS_CREATE_FUNCTION_H_
+
+#include <sqlite3.h>
+#include <unordered_map>
+
+#include "src/trace_processor/prelude/functions/register_function.h"
+
+namespace perfetto {
+namespace trace_processor {
+
+// Implementation of CREATE_FUNCTION SQL function.
+// See https://perfetto.dev/docs/analysis/metrics#metric-helper-functions for
+// usage of this function.
+struct CreateFunction : public SqlFunction {
+ struct PerFunctionState {
+ ScopedStmt stmt;
+ // void* to avoid leaking state.
+ void* created_functon_context;
+ };
+ struct NameAndArgc {
+ std::string name;
+ int argc;
+
+ struct Hasher {
+ std::size_t operator()(const NameAndArgc& s) const noexcept;
+ };
+ bool operator==(const NameAndArgc& other) const {
+ return name == other.name && argc == other.argc;
+ }
+ };
+ using State = std::unordered_map<NameAndArgc,
+ CreateFunction::PerFunctionState,
+ NameAndArgc::Hasher>;
+
+ struct Context {
+ sqlite3* db;
+ State* state;
+ };
+
+ static constexpr bool kVoidReturn = true;
+
+ static base::Status Run(Context* ctx,
+ size_t argc,
+ sqlite3_value** argv,
+ SqlValue& out,
+ Destructors&);
+};
+
+} // namespace trace_processor
+} // namespace perfetto
+
+#endif // SRC_TRACE_PROCESSOR_PRELUDE_FUNCTIONS_CREATE_FUNCTION_H_
