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/*
* Copyright 2017 The Native Object Protocols Authors
*
* 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 LIBNOP_INCLUDE_NOP_UTILITY_BACKTRACE_H_
#define LIBNOP_INCLUDE_NOP_UTILITY_BACKTRACE_H_
#include <execinfo.h>
#include <cstdlib>
#include <iostream>
#include <memory>
#include <sstream>
#include <string>
#include <vector>
namespace nop {
//
// Backtrace utility based on the UNIX backtrace API.
//
// Provides a simple mechanism to generate a backtrace with symbol lookup.
//
class Backtrace {
public:
Backtrace() = default;
Backtrace(const Backtrace&) = default;
Backtrace& operator=(const Backtrace&) = default;
Backtrace(Backtrace&&) = default;
Backtrace& operator=(Backtrace&&) = default;
enum : std::size_t { kMaxStackFrames = 1024 };
static Backtrace Create(
std::size_t max_stack_frames = kMaxStackFrames) {
std::vector<void*> stack_frames(max_stack_frames);
const int count = backtrace(stack_frames.data(), stack_frames.size());
if (count < 0)
return Backtrace{};
stack_frames.resize(count);
return Backtrace{std::move(stack_frames)};
}
std::string to_string() const {
std::stringstream stream;
stream << *this;
return stream.str();
}
friend std::ostream& operator<<(std::ostream& stream,
const Backtrace& backtrace) {
auto strings = backtrace.GetStrings();
if (!strings) {
stream << "<backtrace failed>" << std::endl;
} else {
for (std::size_t i = 0; i < backtrace.size(); i++)
stream << strings[i] << std::endl;
}
return stream;
}
void* operator[](std::size_t index) const { return stack_frames_[index]; }
std::size_t size() const { return stack_frames_.size(); }
void clear() { stack_frames_.clear(); }
explicit operator bool() const { return size() > 0; }
private:
Backtrace(std::vector<void*> stack_frames)
: stack_frames_{std::move(stack_frames)} {}
std::unique_ptr<char* [], decltype(std::free) *> GetStrings() const {
return {backtrace_symbols(stack_frames_.data(), stack_frames_.size()),
std::free};
}
std::vector<void*> stack_frames_;
};
} // namespace nop
#endif // LIBNOP_INCLUDE_NOP_UTILITY_BACKTRACE_H_
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