api/samples/cbrtrace.c

/* **********************************************************
 * Copyright (c) 2014 Google, Inc.  All rights reserved.
 * **********************************************************/

/*
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 * 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 VMware, 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
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 * DAMAGE.
 */

/* Code Manipulation API Sample:
 * cbrtrace.c
 *
 * Collects the conditional branch address, fall-through address,
 * target address, and taken information.
 * Writes that info into per-thread files named cbrtrace.<pid>.<tid>.log
 * in the client library directory.
 *
 * Illustrates how to use dr_insert_cbr_instrument_ex().
 */

#include "dr_api.h"
#include "utils.h"

client_id_t client_id;

/* Clean call for the cbr */
static void
at_cbr(app_pc inst_addr, app_pc targ_addr, app_pc fall_addr, int taken, void *bb_addr)
{
    void *drcontext = dr_get_current_drcontext();
    file_t log = (file_t)(ptr_uint_t)dr_get_tls_field(drcontext);
    dr_fprintf(log, ""PFX" ["PFX", "PFX", "PFX"] => "PFX"\n",
               bb_addr, inst_addr, fall_addr, targ_addr,
               taken == 0 ? fall_addr : targ_addr);
}

static dr_emit_flags_t
event_basic_block(void *drcontext, void *tag, instrlist_t *bb,
                  bool for_trace, bool translating)
{
    instr_t *instr;
    for (instr  = instrlist_first_app(bb);
         instr != NULL;
         instr  = instr_get_next_app(instr)) {
        if (instr_is_cbr(instr)) {
            dr_insert_cbr_instrumentation_ex
                (drcontext, bb, instr, (void *)at_cbr,
                 OPND_CREATE_INTPTR(dr_fragment_app_pc(tag)));
        }
    }
    return DR_EMIT_DEFAULT;
}

static void
event_thread_init(void *drcontext)
{
    file_t log;
    log = log_file_open(client_id, drcontext, NULL /* using client lib path */,
                        "cbrtrace",
#ifndef WINDOWS
                        DR_FILE_CLOSE_ON_FORK |
#endif
                        DR_FILE_ALLOW_LARGE);
    DR_ASSERT(log != INVALID_FILE);
    dr_set_tls_field(drcontext, (void *)(ptr_uint_t)log);
}

static void
event_thread_exit(void *drcontext)
{
    log_file_close((file_t)(ptr_uint_t)dr_get_tls_field(drcontext));
}

static void
event_exit(void)
{
    dr_log(NULL, LOG_ALL, 1, "Client 'cbrtrace' exiting");
#ifdef SHOW_RESULTS
    if (dr_is_notify_on())
        dr_fprintf(STDERR, "Client 'cbrtrace' exiting\n");
#endif
}

DR_EXPORT
void dr_init(client_id_t id)
{
    dr_set_client_name("DynamoRIO Sample Client 'cbrtrace'",
                       "http://dynamorio.org/issues");
    dr_log(NULL, LOG_ALL, 1, "Client 'cbrtrace' initializing");

    client_id = id;
    dr_register_thread_init_event(event_thread_init);
    dr_register_thread_exit_event(event_thread_exit);
    dr_register_bb_event(event_basic_block);
    dr_register_exit_event(event_exit);

#ifdef SHOW_RESULTS
    if (dr_is_notify_on()) {
# ifdef WINDOWS
        dr_enable_console_printing();
# endif /* WINDOWS */
        dr_fprintf(STDERR, "Client 'cbrtrace' is running\n");
    }
#endif /* SHOW_RESULTS */
}