/* * 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; } }