struct btp_frame *
btp_backtrace_get_crash_frame(struct btp_backtrace *backtrace)
{
backtrace = btp_backtrace_dup(backtrace);
struct btp_thread *crash_thread = btp_backtrace_find_crash_thread(backtrace);
if (!crash_thread)
{
btp_backtrace_free(backtrace);
return NULL;
}
btp_normalize_backtrace(backtrace);
struct btp_frame *crash_frame = crash_thread->frames;
crash_frame = btp_frame_dup(crash_frame, false);
btp_backtrace_free(backtrace);
return crash_frame;
}
struct btp_backtrace *
btp_backtrace_parse(const char **input,
struct btp_location *location)
{
const char *local_input = *input;
struct btp_backtrace *imbacktrace = btp_backtrace_new(); /* im - intermediate */
imbacktrace->libs = btp_sharedlib_parse(*input);
/* The header is mandatory, but it might contain no frame header,
* in some broken backtraces. In that case, backtrace.crash value
* is kept as NULL.
*/
if (!btp_backtrace_parse_header(&local_input,
&imbacktrace->crash,
location))
{
btp_backtrace_free(imbacktrace);
return NULL;
}
struct btp_thread *thread, *prevthread = NULL;
while ((thread = btp_thread_parse(&local_input, location)))
{
if (prevthread)
{
btp_thread_add_sibling(prevthread, thread);
prevthread = thread;
}
else
imbacktrace->threads = prevthread = thread;
}
if (!imbacktrace->threads)
{
btp_backtrace_free(imbacktrace);
return NULL;
}
*input = local_input;
return imbacktrace;
}
float
btp_backtrace_quality_complex(struct btp_backtrace *backtrace)
{
backtrace = btp_backtrace_dup(backtrace);
/* Find the crash thread, and then normalize the backtrace. It is
* not possible to find the crash thread after the backtrace has
* been normalized.
*/
struct btp_thread *crash_thread = btp_backtrace_find_crash_thread(backtrace);
btp_normalize_backtrace(backtrace);
/* Get the quality q1 of the full backtrace. */
float q1 = btp_backtrace_quality_simple(backtrace);
if (!crash_thread)
{
btp_backtrace_free(backtrace);
return q1;
}
/* Get the quality q2 of the crash thread. */
float q2 = btp_thread_quality(crash_thread);
/* Get the quality q3 of the frames around the crash. First,
* duplicate the crash thread so we can cut it. Then find an exit
* frame, and remove it and everything above it
* (__run_exit_handlers and such). Then remove all the redundant
* frames (assert calls etc.) Then limit the frame count to 5.
*/
btp_thread_remove_frames_below_n(crash_thread, 5);
float q3 = btp_thread_quality(crash_thread);
btp_backtrace_free(backtrace);
/* Compute and return the final backtrace quality q. */
return 0.25f * q1 + 0.35f * q2 + 0.4f * q3;
}
char *
btp_backtrace_get_duplication_hash(struct btp_backtrace *backtrace)
{
backtrace = btp_backtrace_dup(backtrace);
struct btp_thread *crash_thread = btp_backtrace_find_crash_thread(backtrace);
if (crash_thread)
btp_backtrace_remove_threads_except_one(backtrace, crash_thread);
btp_normalize_backtrace(backtrace);
btp_backtrace_limit_frame_depth(backtrace, 3);
char *hash = btp_backtrace_to_text(backtrace, false);
btp_backtrace_free(backtrace);
return hash;
}
struct btp_thread *
btp_backtrace_get_optimized_thread(struct btp_backtrace *backtrace, int max_frames)
{
struct btp_thread *crash_thread;
backtrace = btp_backtrace_dup(backtrace);
crash_thread = btp_backtrace_find_crash_thread(backtrace);
if (!crash_thread) {
btp_backtrace_free(backtrace);
return NULL;
}
btp_backtrace_remove_threads_except_one(backtrace, crash_thread);
btp_backtrace_set_libnames(backtrace);
btp_normalize_thread(crash_thread);
btp_normalize_optimize_thread(crash_thread);
/* Remove frames with no function name (i.e. signal handlers). */
struct btp_frame *frame = crash_thread->frames, *frame_next;
while (frame)
{
frame_next = frame->next;
if (!frame->function_name)
btp_thread_remove_frame(crash_thread, frame);
frame = frame_next;
}
if (max_frames > 0)
btp_thread_remove_frames_below_n(crash_thread, max_frames);
crash_thread = btp_thread_dup(crash_thread, false);
btp_backtrace_free(backtrace);
return crash_thread;
}
int main(int argc, char **argv)
{
abrt_init(argv);
/* Can't keep these strings/structs static: _() doesn't support that */
const char *program_usage_string = _(
"\b [options] -d DIR\n"
"\n"
"Analyzes C/C++ backtrace, generates duplication hash, backtrace rating, and identifies crash function in dump directory DIR"
);
enum {
OPT_v = 1 << 0,
OPT_d = 1 << 1
};
/* Keep enum above and order of options below in sync! */
struct options program_options[] = {
OPT__VERBOSE(&g_verbose),
OPT_STRING('d', NULL, &dump_dir_name, "DIR", _("Dump directory")),
OPT_END()
};
/*unsigned opts =*/ parse_opts(argc, argv, program_options, program_usage_string);
export_abrt_envvars(0);
struct dump_dir *dd = dd_opendir(dump_dir_name, /*flags:*/ 0);
if (!dd)
return 1;
char *component = dd_load_text(dd, FILENAME_COMPONENT);
/* Read backtrace */
char *backtrace_str = dd_load_text_ext(dd, FILENAME_BACKTRACE,
DD_LOAD_TEXT_RETURN_NULL_ON_FAILURE);
if (!backtrace_str)
{
dd_close(dd);
return 1;
}
/* Compute backtrace hash */
struct btp_location location;
btp_location_init(&location);
char *backtrace_str_ptr = backtrace_str;
struct btp_backtrace *backtrace = btp_backtrace_parse(&backtrace_str_ptr, &location);
free(backtrace_str);
/* Store backtrace hash */
if (!backtrace)
{
/*
* The parser failed. Compute the duphash from the executable
* instead of a backtrace.
* and component only. This is not supposed to happen often.
*/
log(_("Backtrace parsing failed for %s"), dump_dir_name);
log("%d:%d: %s", location.line, location.column, location.message);
struct strbuf *emptybt = strbuf_new();
char *executable = dd_load_text(dd, FILENAME_EXECUTABLE);
strbuf_prepend_str(emptybt, executable);
free(executable);
strbuf_prepend_str(emptybt, component);
VERB3 log("Generating duphash: %s", emptybt->buf);
char hash_str[SHA1_RESULT_LEN*2 + 1];
create_hash(hash_str, emptybt->buf);
dd_save_text(dd, FILENAME_DUPHASH, hash_str);
/*
* Other parts of ABRT assume that if no rating is available,
* it is ok to allow reporting of the bug. To be sure no bad
* backtrace is reported, rate the backtrace with the lowest
* rating.
*/
dd_save_text(dd, FILENAME_RATING, "0");
strbuf_free(emptybt);
free(component);
dd_close(dd);
/* Report success even if the parser failed, as the backtrace
* has been created and rated. The failure is caused by a flaw
* in the parser, not in the backtrace.
*/
return 0;
}
/* Compute duplication hash. */
char *str_hash_core = btp_backtrace_get_duplication_hash(backtrace);
struct strbuf *str_hash = strbuf_new();
strbuf_append_str(str_hash, component);
strbuf_append_str(str_hash, str_hash_core);
VERB3 log("Generating duphash: %s", str_hash->buf);
char hash_str[SHA1_RESULT_LEN*2 + 1];
create_hash(hash_str, str_hash->buf);
dd_save_text(dd, FILENAME_DUPHASH, hash_str);
strbuf_free(str_hash);
free(str_hash_core);
/* Compute the backtrace rating. */
float quality = btp_backtrace_quality_complex(backtrace);
const char *rating;
if (quality < 0.6f)
rating = "0";
else if (quality < 0.7f)
rating = "1";
else if (quality < 0.8f)
rating = "2";
else if (quality < 0.9f)
rating = "3";
else
rating = "4";
dd_save_text(dd, FILENAME_RATING, rating);
/* Get the function name from the crash frame. */
struct btp_frame *crash_frame = btp_backtrace_get_crash_frame(backtrace);
if (crash_frame)
{
if (crash_frame->function_name &&
0 != strcmp(crash_frame->function_name, "??"))
{
dd_save_text(dd, FILENAME_CRASH_FUNCTION, crash_frame->function_name);
}
btp_frame_free(crash_frame);
}
btp_backtrace_free(backtrace);
dd_close(dd);
free(component);
return 0;
}
