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gdb: remove unneeded switch_to_thread from thr_try_catch_cmd

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I spotted that every time thr_try_catch_cmd is called GDB has already
switched to the required thread.  The call to switch_to_thread at the
head of thr_try_catch_cmd is therefore redundant.

This commit replaces the call to switch_to_thread with an assertion
that we already have the required thread selected.

I also extended the header comment on thr_try_catch_cmd to make it
clearer when this function could throw an exception.

There should be no user visible changes after this commit.

gdb/ChangeLog:

	* thread.c (thr_try_catch_cmd): Replace swith_to_thread with an
	assert.  Extend the header comment.
This commit is contained in:
Andrew Burgess
2021-01-27 18:20:35 +00:00
parent f237f998d1
commit 0f93c3a25b
2 changed files with 9 additions and 3 deletions
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7
gdb/thread.c
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@ -1466,15 +1466,16 @@ tp_array_compar_descending (const thread_info_ref &a, const thread_info_ref &b)
return (a->per_inf_num > b->per_inf_num);
}
/* Switch to thread THR and execute CMD.
/* Assuming that THR is the current thread, execute CMD.
FLAGS.QUIET controls the printing of the thread information.
FLAGS.CONT and FLAGS.SILENT control how to handle errors. */
FLAGS.CONT and FLAGS.SILENT control how to handle errors. Can throw an
exception if !FLAGS.SILENT and !FLAGS.CONT and CMD fails. */
static void
thr_try_catch_cmd (thread_info *thr, const char *cmd, int from_tty,
const qcs_flags &flags)
{
switch_to_thread (thr);
gdb_assert (is_current_thread (thr));
/* The thread header is computed before running the command since
the command can change the inferior, which is not permitted