static int
frame_callback(Dwfl_Frame *frame, void *data)
{
struct frame_callback_arg *frame_arg = data;
char **error_msg = &frame_arg->error_msg;
Dwarf_Addr pc;
bool minus_one;
if (!dwfl_frame_pc(frame, &pc, &minus_one))
{
set_error_dwfl("dwfl_frame_pc");
return DWARF_CB_ABORT;
}
Dwfl *dwfl = dwfl_thread_dwfl(dwfl_frame_thread(frame));
struct sr_core_frame *result = resolve_frame(dwfl, pc, minus_one);
/* Do not unwind below __libc_start_main. */
if (0 == sr_strcmp0(result->function_name, "__libc_start_main"))
{
sr_core_frame_free(result);
return CB_STOP_UNWIND;
}
frame_arg->thread->frames =
sr_core_frame_append(frame_arg->thread->frames, result);
return DWARF_CB_OK;
}
void
sr_normalize_core_thread(struct sr_core_thread *thread)
{
/* Find the exit frame and remove everything above it. */
struct sr_core_frame *exit_frame = sr_core_thread_find_exit_frame(thread);
if (exit_frame)
{
bool success = sr_thread_remove_frames_above((struct sr_thread *)thread,
(struct sr_frame *)exit_frame);
assert(success); /* if this fails, some code become broken */
success = sr_thread_remove_frame((struct sr_thread *)thread,
(struct sr_frame *)exit_frame);
assert(success); /* if this fails, some code become broken */
}
/* Normalize function names by removing various prefixes that
* occur only in some cases.
*/
struct sr_core_frame *frame = thread->frames;
while (frame)
{
/* Remove IA__ prefix used in GLib, GTK and GDK. */
remove_func_prefix(frame->function_name, "IA__gdk", strlen("IA__"));
remove_func_prefix(frame->function_name, "IA__g_", strlen("IA__"));
remove_func_prefix(frame->function_name, "IA__gtk", strlen("IA__"));
/* Remove __GI_ (glibc internal) prefix. */
remove_func_prefix(frame->function_name, "__GI_", strlen("__GI_"));
frame = frame->next;
}
/* Unify some functions by renaming them.
*/
frame = thread->frames;
while (frame)
{
char *new_function_name =
find_new_function_name_glibc(frame->function_name, frame->file_name);
if (new_function_name)
{
free(frame->function_name);
frame->function_name = new_function_name;
}
frame = frame->next;
}
/* Remove redundant frames from the thread.
*/
frame = thread->frames;
while (frame)
{
struct sr_core_frame *next_frame = frame->next;
/* Remove frames which are not a cause of the crash. */
bool removable =
is_removable_dbus(frame->function_name, frame->file_name) ||
is_removable_gdk(frame->function_name, frame->file_name) ||
is_removable_glib(frame->function_name, frame->file_name) ||
is_removable_glibc(frame->function_name, frame->file_name) ||
is_removable_libstdcpp(frame->function_name, frame->file_name) ||
is_removable_linux(frame->function_name, frame->file_name) ||
is_removable_xorg(frame->function_name, frame->file_name) ||
is_removable_jvm(frame->function_name, frame->file_name) ||
is_removable_vim(frame->function_name, frame->file_name);
bool removable_with_above =
is_removable_glibc_with_above(frame->function_name, frame->file_name) ||
sr_core_thread_is_exit_frame(frame);
if (removable_with_above)
{
bool success = sr_thread_remove_frames_above((struct sr_thread *)thread,
(struct sr_frame *)frame);
assert(success);
}
if (removable || removable_with_above)
sr_thread_remove_frame((struct sr_thread *)thread, (struct sr_frame *)frame);
frame = next_frame;
}
/* If the first frame has address 0x0000 and its name is '??', it
* is a dereferenced null, and we remove it. This frame is not
* really invalid, but it affects stacktrace quality rating. See
* Red Hat Bugzilla bug #639038.
* @code
* #0 0x0000000000000000 in ?? ()
* No symbol table info available.
* #1 0x0000000000422648 in main (argc=1, argv=0x7fffa57cf0d8) at totem.c:242
* error = 0x0
* totem = 0xdee070 [TotemObject]
* @endcode
*/
if (thread->frames &&
thread->frames->address == 0x0000 &&
!thread->frames->function_name)
{
sr_thread_remove_frame((struct sr_thread *)thread,
(struct sr_frame *)thread->frames);
}
/* If the last frame has address 0x0000 and its name is '??',
* remove it. This frame is not really invalid, but it affects
* stacktrace quality rating. See Red Hat Bugzilla bug #592523.
* @code
* #2 0x00007f4dcebbd62d in clone ()
* at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
* No locals.
* #3 0x0000000000000000 in ?? ()
* @endcode
*/
struct sr_core_frame *last = thread->frames;
while (last && last->next)
last = last->next;
if (last &&
last->address == 0x0000 &&
!last->function_name)
{
sr_thread_remove_frame((struct sr_thread *)thread, (struct sr_frame *)last);
}
/* Merge recursively called functions into single frame */
struct sr_core_frame *curr_frame = thread->frames;
struct sr_core_frame *prev_frame = NULL;
while (curr_frame)
{
if (prev_frame &&
prev_frame->function_name &&
0 == sr_strcmp0(prev_frame->function_name, curr_frame->function_name))
{
prev_frame->next = curr_frame->next;
sr_core_frame_free(curr_frame);
curr_frame = prev_frame->next;
continue;
}
prev_frame = curr_frame;
curr_frame = curr_frame->next;
}
}
