[gdb/cli] Add maintenance ignore-probes

There's a command "disable probes", but SystemTap probes, for instance
libc:longjmp cannot be disabled:
...
$ gdb -q -batch a.out -ex start -ex "disable probes libc ^longjmp$"
  ...
Probe libc:longjmp cannot be disabled.
Probe libc:longjmp cannot be disabled.
Probe libc:longjmp cannot be disabled.
...

Add a command "maintenance ignore-probes" that ignores probes during
get_probes, such that we can easily pretend to use a libc without the
libc:longjmp probe:
...
(gdb) maint ignore-probes -verbose libc ^longjmp$
ignore-probes filter has been set to:
PROVIDER: 'libc'
PROBE_NAME: '^longjmp$'
OBJNAME: ''
(gdb) start ^M
  ...
Ignoring SystemTap probe libc longjmp in /lib64/libc.so.6.^M
Ignoring SystemTap probe libc longjmp in /lib64/libc.so.6.^M
Ignoring SystemTap probe libc longjmp in /lib64/libc.so.6.^M
...

The "Ignoring ..." messages can be suppressed by not using -verbose.

Note that as with "disable probes", running simply "maint ignore-probes"
ignores all probes.

The ignore-probes filter can be reset by using:
...
(gdb) maint ignore-probes -reset
ignore-probes filter has been reset
...

For now, the command is only supported for SystemTap probes.

PR cli/27159
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=27159

1 files changed, 3 insertions, 0 deletions

diff --git a/gdb/stap-probe.c b/gdb/stap-probe.c
index 6f91d87..f119e2c 100644
--- a/gdb/stap-probe.c
+++ b/gdb/stap-probe.c
@@ -1619,6 +1619,9 @@ handle_stap_probe (struct objfile *objfile, struct sdt_note *el,
       return;
     }
 
+  if (ignore_probe_p (provider, name, objfile_name (objfile), "SystemTap"))
+    return;
+
   stap_probe *ret = new stap_probe (std::string (name), std::string (provider),
 				    address, gdbarch, sem_addr, probe_args);