gdb: print thread names in thread apply command output

This makes the thread apply command print the thread's name.  The use
of target_pid_to_str is replaced by thread_target_id_str, which
provides the same output as "info threads".

Before:
(gdb) thread apply 2 bt

Thread 2 (Thread 0x7fd245602700 (LWP 3837)):
[...]

After:
(gdb) thread apply 2 bt

Thread 2 (Thread 0x7fd245602700 (LWP 3837) "HT cleanup"):
[...]

The thread's description header is pre-computed before running the
command since the command may change the selected inferior. This is
not permitted by thread_target_id_str as target_thread_name asserts
that `info->inf == current_inferior ()`.

This situation arises in the `gdb.threads/threadapply.exp` test which
kills and removes the inferior as part of a "thread apply" command.

gdb/ChangeLog:

        * thread.c (thr_try_catch_cmd): Print thread name.

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 33f7bc8707ab82a408a8981cbd66142992c5b1de..385cd010af9b7865aafb3a5d1d0800960fe0cb0d 100644 (file)
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,7 @@
+2020-02-26  Jérémie Galarneau  <jeremie.galarneau@efficios.com>
+
+       * thread.c (thr_try_catch_cmd): Print thread name.
+
 2020-02-26  Simon Marchi  <simon.marchi@efficios.com>
 
        * dwarf2/loc.h (dwarf2_fetch_die_loc_sect_off,

diff --git a/gdb/thread.c b/gdb/thread.c
index 54b59e22448a260e4190ffe5438b8b5c799a1cd9..c6e3d356a5a352de4bb07e5a3eab38a4b39b2fc9 100644 (file)
--- a/gdb/thread.c
+++ b/gdb/thread.c
@@ -1563,6 +1563,14 @@ thr_try_catch_cmd (thread_info *thr, const char *cmd, int from_tty,
                   const qcs_flags &flags)
 {
   switch_to_thread (thr);
+
+  /* The thread header is computed before running the command since
+     the command can change the inferior, which is not permitted
+     by thread_target_id_str.  */
+  std::string thr_header =
+    string_printf (_("\nThread %s (%s):\n"), print_thread_id (thr),
+                  thread_target_id_str (thr).c_str ());
+
   try
     {
       std::string cmd_result = execute_command_to_string
@@ -1570,9 +1578,7 @@ thr_try_catch_cmd (thread_info *thr, const char *cmd, int from_tty,
       if (!flags.silent || cmd_result.length () > 0)
        {
          if (!flags.quiet)
-           printf_filtered (_("\nThread %s (%s):\n"),
-                            print_thread_id (thr),
-                            target_pid_to_str (inferior_ptid).c_str ());
+           printf_filtered ("%s", thr_header.c_str ());
          printf_filtered ("%s", cmd_result.c_str ());
        }
     }
@@ -1581,9 +1587,7 @@ thr_try_catch_cmd (thread_info *thr, const char *cmd, int from_tty,
       if (!flags.silent)
        {
          if (!flags.quiet)
-           printf_filtered (_("\nThread %s (%s):\n"),
-                            print_thread_id (thr),
-                            target_pid_to_str (inferior_ptid).c_str ());
+           printf_filtered ("%s", thr_header.c_str ());
          if (flags.cont)
            printf_filtered ("%s\n", ex.what ());
          else