/*
* Copyright © 2014 Canonical Ltd.
*
* This program is free software: you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License version 3,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program. If not, see .
*
* Authored by: Thomas Voß
*/
#include "backtrace.h"
#include
#include
namespace bt = core::posix::backtrace;
namespace impl
{
std::tuple demangle(const std::string& symbol)
{
int status = 1;
auto result = abi::__cxa_demangle(symbol.c_str(),
nullptr,
nullptr,
&status);
if (!result || status != 0)
{
return std::make_tuple(std::string(), false);
}
std::string s{result};
::free(result);
return std::make_tuple(s, true);
}
struct Frame : public bt::Frame
{
struct Symbol : public bt::Frame::Symbol
{
Symbol(const char* symbol) : raw_(symbol)
{
auto first = raw_.find_first_of("(");
auto last = raw_.find_last_of(")");
if (first != std::string::npos && last != std::string::npos)
{
auto mangled_symbol = raw_.substr(first+1,
(last-1) - (first+1));
auto plus = mangled_symbol.find_first_of("+");
if (plus != std::string::npos)
mangled_symbol.erase(plus);
std::tie(demangled_, is_cxx_) = demangle(mangled_symbol);
if (!is_cxx_)
demangled_ = raw_;
}
}
bool is_cxx() const
{
return is_cxx_;
}
std::string demangled() const
{
return demangled_;
}
std::string raw() const
{
return raw_;
}
std::string raw_;
std::string demangled_;
bool is_cxx_ = false;
};
std::size_t depth_;
void* frame_pointer_;
Symbol symbol_;
Frame(std::size_t depth, void* frame_pointer, const char* symbol)
: depth_(depth),
frame_pointer_(frame_pointer),
symbol_(symbol)
{
}
std::size_t depth() const
{
return depth_;
}
virtual void* frame_pointer() const
{
return frame_pointer_;
}
const Symbol& symbol() const
{
return symbol_;
}
};
}
std::shared_ptr bt::Frame::Symbol::for_testing_from_raw_symbol(const char* symbol)
{
return std::shared_ptr(new impl::Frame::Symbol(symbol));
}
void bt::visit_with_handler(const bt::FrameHandler& handler)
{
static const unsigned int max_frames=64;
void *frames[max_frames];
auto frame_count = ::backtrace(frames, max_frames);
auto symbols = ::backtrace_symbols(frames, frame_count);
struct Scope
{
Scope(char** symbols) : symbols(symbols)
{
}
~Scope()
{
::free(symbols);
}
char** symbols = nullptr;
} scope{symbols};
for (int i = 0; i < frame_count; i++)
{
impl::Frame frame(i, frames[i], symbols[i]);
if (!handler(frame))
return;
}
}