full-dynamic tracing doesn't nicely work with -F filter

[honggyukim]

Please see the following output.

$ uftrace record -P. gcc ~/hello.c

$ uftrace replay -t 10us
# DURATION     TID     FUNCTION
  51.756 us [ 30300] | setlocale();
 133.615 us [ 30300] | gettext();
  13.255 us [ 30300] | __realpath_chk();
  34.159 us [ 30300] | mkstemps();
            [ 30300] | vfork() {
            [ 30309] | } /* vfork */
            [ 30309] | execv() {
 355.139 us [ 30300] | } /* vfork */
            [ 30300] | waitpid() {
            [ 30309] | main() {
            [ 30309] |   toplev::main() {
            [ 30309] |     gcc_init_libintl() {
  57.686 us [ 30309] |       setlocale();
 173.421 us [ 30309] |       gettext();
 260.452 us [ 30309] |     } /* gcc_init_libintl */
            [ 30309] |     diagnostic_initialize() {
  17.978 us [ 30309] |       diagnostic_set_caret_max_width();
  26.049 us [ 30309] |     } /* diagnostic_initialize */
...

It shows some other library functions are executed before toplev::main. I tested to apply -F filter to toplev::main as follows:

$ uftrace record -P. -F toplev::main gcc ~/hello.c

$ uftrace replay -t 10us
# DURATION     TID     FUNCTION
  44.289 us [ 30352] | setlocale();
 136.151 us [ 30352] | gettext();
  31.806 us [ 30352] | mkstemps();
            [ 30352] | vfork() {
            [ 30361] | } /* vfork */
            [ 30361] | execv() {
 361.134 us [ 30352] | } /* vfork */
            [ 30352] | waitpid() {
            [ 30361] | toplev::main() {
            [ 30361] |   gcc_init_libintl() {
  56.928 us [ 30361] |     setlocale();
 135.535 us [ 30361] |     gettext();
 217.833 us [ 30361] |   } /* gcc_init_libintl */
            [ 30361] |   diagnostic_initialize() {
...

However, it still shows other functions from different tasks, but only hide functions from the same task.

[namhyung]

I guess it's in a different session and disabled the filter since the symbol is not found

[namhyung]

I think the toplev::main() is a function in a new executable. It's executed after execv() and the original binary didn't know about the function. So it couldn't apply the filter to the original executable and showed other functions too.

[honggyukim]

We currently ignore filters if nothing is matched. Can we hide everything is nothing is matched with -F and other filters? -N or -H can be counter examples though.