react-native/ReactCommon/cxxreact/SystraceSection.h

49 lines
1.3 KiB
C++

// Copyright (c) 2004-present, Facebook, Inc.
// This source code is licensed under the MIT license found in the
// LICENSE file in the root directory of this source tree.
#pragma once
#ifdef WITH_FBSYSTRACE
#include <fbsystrace.h>
#endif
namespace facebook {
namespace react {
/**
* This is a convenience class to avoid lots of verbose profiling
* #ifdefs. If WITH_FBSYSTRACE is not defined, the optimizer will
* remove this completely. If it is defined, it will behave as
* FbSystraceSection, with the right tag provided. Use two separate classes to
* to ensure that the ODR rule isn't violated, that is, if WITH_FBSYSTRACE has
* different values in different files, there is no inconsistency in the sizes
* of defined symbols.
*/
#ifdef WITH_FBSYSTRACE
struct ConcreteSystraceSection {
public:
template<typename... ConvertsToStringPiece>
explicit
ConcreteSystraceSection(const char* name, ConvertsToStringPiece&&... args)
: m_section(TRACE_TAG_REACT_CXX_BRIDGE, name, args...)
{}
private:
fbsystrace::FbSystraceSection m_section;
};
using SystraceSection = ConcreteSystraceSection;
#else
struct DummySystraceSection {
public:
template<typename... ConvertsToStringPiece>
explicit
DummySystraceSection(const char* name, ConvertsToStringPiece&&... args)
{}
};
using SystraceSection = DummySystraceSection;
#endif
}}