// Copyright Antony Polukhin, 2016-2020.
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//
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// Distributed under the Boost Software License, Version 1.0. (See
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// accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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#ifndef BOOST_STACKTRACE_DETAIL_ADDR2LINE_IMPLS_HPP
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#define BOOST_STACKTRACE_DETAIL_ADDR2LINE_IMPLS_HPP
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#include <boost/config.hpp>
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#ifdef BOOST_HAS_PRAGMA_ONCE
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# pragma once
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#endif
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#include <boost/stacktrace/detail/to_hex_array.hpp>
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#include <boost/stacktrace/detail/to_dec_array.hpp>
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#include <boost/stacktrace/detail/try_dec_convert.hpp>
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#include <boost/core/demangle.hpp>
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#include <cstdio>
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <signal.h>
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namespace boost { namespace stacktrace { namespace detail {
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#if defined(BOOST_STACKTRACE_ADDR2LINE_LOCATION) && !defined(BOOST_NO_CXX11_CONSTEXPR)
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constexpr bool is_abs_path(const char* path) BOOST_NOEXCEPT {
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return *path != '\0' && (
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*path == ':' || *path == '/' || is_abs_path(path + 1)
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);
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}
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#endif
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class addr2line_pipe {
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::FILE* p;
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::pid_t pid;
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public:
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explicit addr2line_pipe(const char *flag, const char* exec_path, const char* addr) BOOST_NOEXCEPT
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: p(0)
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, pid(0)
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{
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int pdes[2];
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#ifdef BOOST_STACKTRACE_ADDR2LINE_LOCATION
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char prog_name[] = BOOST_STRINGIZE( BOOST_STACKTRACE_ADDR2LINE_LOCATION );
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#if !defined(BOOST_NO_CXX11_CONSTEXPR) && !defined(BOOST_NO_CXX11_STATIC_ASSERT)
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static_assert(
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boost::stacktrace::detail::is_abs_path( BOOST_STRINGIZE( BOOST_STACKTRACE_ADDR2LINE_LOCATION ) ),
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"BOOST_STACKTRACE_ADDR2LINE_LOCATION must be an absolute path"
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);
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#endif
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#else
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char prog_name[] = "/usr/bin/addr2line";
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#endif
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char* argp[] = {
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prog_name,
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const_cast<char*>(flag),
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const_cast<char*>(exec_path),
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const_cast<char*>(addr),
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0
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};
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if (::pipe(pdes) < 0) {
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return;
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}
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pid = ::fork();
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switch (pid) {
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case -1:
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// Failed...
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::close(pdes[0]);
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::close(pdes[1]);
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return;
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case 0:
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// We are the child.
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::close(STDERR_FILENO);
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::close(pdes[0]);
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if (pdes[1] != STDOUT_FILENO) {
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::dup2(pdes[1], STDOUT_FILENO);
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}
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// Do not use `execlp()`, `execvp()`, and `execvpe()` here!
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// `exec*p*` functions are vulnerable to PATH variable evaluation attacks.
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::execv(prog_name, argp);
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::_exit(127);
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}
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p = ::fdopen(pdes[0], "r");
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::close(pdes[1]);
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}
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operator ::FILE*() const BOOST_NOEXCEPT {
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return p;
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}
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~addr2line_pipe() BOOST_NOEXCEPT {
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if (p) {
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::fclose(p);
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int pstat = 0;
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::kill(pid, SIGKILL);
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::waitpid(pid, &pstat, 0);
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}
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}
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};
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inline std::string addr2line(const char* flag, const void* addr) {
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std::string res;
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boost::stacktrace::detail::location_from_symbol loc(addr);
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if (!loc.empty()) {
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res = loc.name();
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} else {
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res.resize(16);
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int rlin_size = ::readlink("/proc/self/exe", &res[0], res.size() - 1);
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while (rlin_size == static_cast<int>(res.size() - 1)) {
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res.resize(res.size() * 4);
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rlin_size = ::readlink("/proc/self/exe", &res[0], res.size() - 1);
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}
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if (rlin_size == -1) {
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res.clear();
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return res;
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}
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res.resize(rlin_size);
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}
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addr2line_pipe p(flag, res.c_str(), to_hex_array(addr).data());
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res.clear();
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if (!p) {
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return res;
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}
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char data[32];
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while (!::feof(p)) {
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if (::fgets(data, sizeof(data), p)) {
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res += data;
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} else {
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break;
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}
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}
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// Trimming
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while (!res.empty() && (res[res.size() - 1] == '\n' || res[res.size() - 1] == '\r')) {
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res.erase(res.size() - 1);
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}
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return res;
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}
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struct to_string_using_addr2line {
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std::string res;
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void prepare_function_name(const void* addr) {
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res = boost::stacktrace::frame(addr).name();
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}
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bool prepare_source_location(const void* addr) {
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//return addr2line("-Cfipe", addr); // Does not seem to work in all cases
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std::string source_line = boost::stacktrace::detail::addr2line("-Cpe", addr);
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if (!source_line.empty() && source_line[0] != '?') {
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res += " at ";
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res += source_line;
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return true;
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}
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return false;
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}
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};
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template <class Base> class to_string_impl_base;
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typedef to_string_impl_base<to_string_using_addr2line> to_string_impl;
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inline std::string name_impl(const void* addr) {
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std::string res = boost::stacktrace::detail::addr2line("-fe", addr);
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res = res.substr(0, res.find_last_of('\n'));
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res = boost::core::demangle(res.c_str());
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if (res == "??") {
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res.clear();
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}
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return res;
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}
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} // namespace detail
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std::string frame::source_file() const {
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std::string res;
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res = boost::stacktrace::detail::addr2line("-e", addr_);
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res = res.substr(0, res.find_last_of(':'));
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if (res == "??") {
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res.clear();
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}
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return res;
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}
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std::size_t frame::source_line() const {
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std::size_t line_num = 0;
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std::string res = boost::stacktrace::detail::addr2line("-e", addr_);
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const std::size_t last = res.find_last_of(':');
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if (last == std::string::npos) {
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return 0;
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}
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res = res.substr(last + 1);
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if (!boost::stacktrace::detail::try_dec_convert(res.c_str(), line_num)) {
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return 0;
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}
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return line_num;
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}
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}} // namespace boost::stacktrace
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#endif // BOOST_STACKTRACE_DETAIL_ADDR2LINE_IMPLS_HPP
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