84 lines
2.0 KiB
C++
84 lines
2.0 KiB
C++
/*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*
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* Copyright 2019, Danny Robson <danny@nerdcruft.net>
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*/
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#include "backtrace.hpp"
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#include "cast.hpp"
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#include "iterator/zip.hpp"
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#include <fmt/ostream.h>
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#include <ostream>
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#include <memory>
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#include <execinfo.h>
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using cruft::backtrace;
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static constexpr std::size_t DEFAULT_DEPTH = 16;
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///////////////////////////////////////////////////////////////////////////////
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backtrace::backtrace (void)
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: m_frames (DEFAULT_DEPTH)
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{
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do {
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int const target = static_cast<int> (m_frames.size ());
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int const last = ::backtrace (
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m_frames.data (), target
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);
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if (last < target) {
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m_frames.resize (last);
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break;
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}
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m_frames.resize (m_frames.size () * 2);
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} while (1);
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}
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///////////////////////////////////////////////////////////////////////////////
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std::ostream&
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cruft::operator <<(std::ostream &os, backtrace const &rhs) {
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fmt::print (os, "{}", rhs);
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return os;
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}
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///////////////////////////////////////////////////////////////////////////////
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fmt::format_context::iterator
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fmt::formatter<cruft::backtrace>::format (
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cruft::backtrace const &obj,
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fmt::format_context &ctx
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) {
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fmt::format_to (ctx.out (), "[ ");
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auto const &frames = obj.frames ();
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using strings_t = std::unique_ptr<char *, decltype(&std::free)>;
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strings_t const names (
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backtrace_symbols (
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frames.data (),
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cruft::cast::lossless <int> (frames.size ())
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),
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::free
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);
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for (auto const [idx,addr]: cruft::iterator::izip (frames)) {
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fmt::format_to (
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ctx.out (),
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"{{ addr: {}, name: '{}', }}, ",
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frames[idx],
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names.get()[idx]
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);
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}
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return fmt::format_to (ctx.out (), " ]");
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} |