/*
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 *
 * Copyright 2010-2019 Danny Robson <danny@nerdcruft.net>
 */

#include "./system.hpp"

#include "debugger.hpp"

#include "../backtrace.hpp"
#include "../log.hpp"

#include <cstdlib>


////////////////////////////////////////////////////////////////////////////////
static void abort_with_trace (void)
{
    // Manually trigger a breakpoint if possible so that the debugger won't
    // silently dump us some place without further information.
    // eg, CLion/GDB/Win32 silently dropping us out of the session.
    breakpoint ();

    // If this is because of an exception we may as well rethrow and hope that
    // the system will print exception data during the abort process.
    //
    // But we can at least try to print anything derived from std::exception
    // (which is a likely guess) before we self-destruct.
    if (auto ptr = std::current_exception (); ptr) {
        try {
            std::rethrow_exception (ptr);
        } catch (std::exception const &x) {
            LOG_EMERGENCY ("unhandled exception: %!\n%!", x.what (), ::cruft::backtrace {});
        } catch (...) {
            LOG_EMERGENCY ("unhandled exception: %!\n", ::cruft::backtrace {});
        }
    } else {
        LOG_EMERGENCY ("aborting: %!", ::cruft::backtrace {});
    }

    std::abort ();
}


///////////////////////////////////////////////////////////////////////////////
void
cruft::debug::init [[gnu::constructor]] (void)
{
    std::set_terminate (abort_with_trace);

    if (!debug_enabled && !getenv ("DEBUG"))
        return;

    LOG_DEBUG ("setting debug environment");
    //enable_fpe ();
    force_console ();
    prepare_debugger ();

    if (getenv ("DEBUG_WAIT"))
        await_debugger ();
}