/* **********************************************************
 * Copyright (c) 2016-2021 Google, Inc.  All rights reserved.
 * **********************************************************/

/*
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * * Redistributions of source code must retain the above copyright notice,
 *   this list of conditions and the following disclaimer.
 *
 * * Redistributions in binary form must reproduce the above copyright notice,
 *   this list of conditions and the following disclaimer in the documentation
 *   and/or other materials provided with the distribution.
 *
 * * Neither the name of Google, Inc. nor the names of its contributors may be
 *   used to endorse or promote products derived from this software without
 *   specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL GOOGLE, INC. OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
 * DAMAGE.
 */

#include "configure.h"
#ifndef UNIX
#    error UNIX-only
#endif
#include "dr_api.h"
#include "tools.h"
#include <math.h>
#include <unistd.h>
#include <signal.h>

static int num_bbs;
static int num_signals;

static void
signal_handler(int sig, siginfo_t *siginfo, ucontext_t *ucxt)
{
    if (sig == SIGSEGV) {
        print("Got SIGSEGV in app handler.\n");
        abort();
    } else {
        print("Got unexpected signal %d\n", sig);
    }
}

static dr_emit_flags_t
event_bb(void *drcontext, void *tag, instrlist_t *bb, bool for_trace, bool translating)
{
    num_bbs++;
    return DR_EMIT_DEFAULT;
}

static dr_signal_action_t
event_signal(void *drcontext, dr_siginfo_t *info)
{
    dr_atomic_add32_return_sum(&num_signals, 1);
    return DR_SIGNAL_DELIVER;
}

static void
event_exit(void)
{
    dr_fprintf(STDERR, "Saw %s bb events\n", num_bbs > 0 ? "some" : "no");
    dr_fprintf(STDERR, "Saw %d signal(s)\n", num_signals);
}

DR_EXPORT void
dr_client_main(client_id_t id, int argc, const char *argv[])
{
    print("in dr_client_main\n");
    dr_register_bb_event(event_bb);
    dr_register_signal_event(event_signal);
    dr_register_exit_event(event_exit);
}

static int
do_some_work(void)
{
    static int iters = 8192;
    int i;
    double val = num_bbs;
    for (i = 0; i < iters; ++i) {
        val += sin(val);
    }
    return (val > 0);
}

int
main(int argc, const char *argv[])
{
    intercept_signal(SIGSEGV, signal_handler, true /*sigstack*/);

    print("pre-DR init\n");
    dr_app_setup();
    assert(!dr_app_running_under_dynamorio());

    dr_app_start();
    assert(dr_app_running_under_dynamorio());

    if (do_some_work() < 0)
        print("error in computation\n");

    print("pre-DR stop\n");
    dr_app_stop_and_cleanup();
    assert(!dr_app_running_under_dynamorio());

    print("all done\n");
    return 0;
}