ros2_tracing/tracetools/include/tracetools/utils.hpp
Christophe Bedard 4f131147af Partially revert "Release micro-ROS Foxy: disable tracetools status app"
This partially reverts commit b473cec508.

Signed-off-by: Christophe Bedard <bedard.christophe@gmail.com>
2020-09-10 19:36:06 -04:00

65 lines
1.9 KiB
C++

// Copyright 2019 Robert Bosch GmbH
//
// 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 TRACETOOLS__UTILS_HPP_
#define TRACETOOLS__UTILS_HPP_
#include <stddef.h>
#include <functional>
#include "tracetools/visibility_control.hpp"
/// Default symbol, used when address resolution fails.
#define SYMBOL_UNKNOWN "UNKNOWN"
TRACETOOLS_PUBLIC const char * _demangle_symbol(const char * mangled);
TRACETOOLS_PUBLIC const char * _get_symbol_funcptr(void * funcptr);
/// Get symbol from an std::function object.
/**
* If function address resolution or symbol demangling fails,
* this will return a string that starts with \ref SYMBOL_UNKNOWN.
*
* \param[in] f the std::function object
* \return the symbol, or a placeholder
*/
template<typename T, typename ... U>
const char * get_symbol(std::function<T(U...)> f)
{
typedef T (fnType)(U...);
fnType ** fnPointer = f.template target<fnType *>();
// If we get an actual address
if (fnPointer != nullptr) {
void * funcptr = reinterpret_cast<void *>(*fnPointer);
return _get_symbol_funcptr(funcptr);
}
// Otherwise we have to go through target_type()
return _demangle_symbol(f.target_type().name());
}
/// Get symbol from a function-related object.
/**
* Fallback meant for lambdas with captures.
*
* \param[in] l a generic object
* \return the symbol
*/
template<typename L>
const char * get_symbol(L && l)
{
return _demangle_symbol(typeid(l).name());
}
#endif // TRACETOOLS__UTILS_HPP_