gdb/exceptions.c

   1 /* Exception (throw catch) mechanism, for GDB, the GNU debugger.
   2
   3    Copyright (C) 1986-2023 Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  19
  20 #include "defs.h"
  21 #include "exceptions.h"
  22 #include "breakpoint.h"
  23 #include "target.h"
  24 #include "inferior.h"
  25 #include "annotate.h"
  26 #include "ui-out.h"
  27 #include "serial.h"
  28 #include "gdbthread.h"
  29 #include "ui.h"
  30 #include "gdbsupport/gdb_optional.h"
  31
  32 static void
  33 print_flush (void)
  34 {
  35   struct ui *ui = current_ui;
  36   struct serial *gdb_stdout_serial;
  37
  38   if (deprecated_error_begin_hook)
  39     deprecated_error_begin_hook ();
  40
  41   gdb::optional<target_terminal::scoped_restore_terminal_state> term_state;
  42   if (target_supports_terminal_ours ())
  43     {
  44       term_state.emplace ();
  45       target_terminal::ours_for_output ();
  46     }
  47
  48   /* We want all output to appear now, before we print the error.  We
  49      have 2 levels of buffering we have to flush (it's possible that
  50      some of these should be changed to flush the lower-level ones
  51      too):  */
  52
  53   /* 1.  The stdio buffer.  */
  54   gdb_flush (gdb_stdout);
  55   gdb_flush (gdb_stderr);
  56
  57   /* 2.  The system-level buffer.  */
  58   gdb_stdout_serial = serial_fdopen (fileno (ui->outstream));
  59   if (gdb_stdout_serial)
  60     {
  61       serial_drain_output (gdb_stdout_serial);
  62       serial_un_fdopen (gdb_stdout_serial);
  63     }
  64
  65   annotate_error_begin ();
  66 }
  67
  68 static void
  69 print_exception (struct ui_file *file, const struct gdb_exception &e)
  70 {
  71   /* KLUDGE: cagney/2005-01-13: Write the string out one line at a time
  72      as that way the MI's behavior is preserved.  */
  73   const char *start;
  74   const char *end;
  75
  76   for (start = e.what (); start != NULL; start = end)
  77     {
  78       end = strchr (start, '\n');
  79       if (end == NULL)
  80         gdb_puts (start, file);
  81       else
  82         {
  83           end++;
  84           file->write (start, end - start);
  85         }
  86     }
  87   gdb_printf (file, "\n");
  88
  89   /* Now append the annotation.  */
  90   switch (e.reason)
  91     {
  92     case RETURN_QUIT:
  93     case RETURN_FORCED_QUIT:
  94       annotate_quit ();
  95       break;
  96     case RETURN_ERROR:
  97       /* Assume that these are all errors.  */
  98       annotate_error ();
  99       break;
 100     default:
 101       internal_error (_("Bad switch."));
 102     }
 103 }
 104
 105 void
 106 exception_print (struct ui_file *file, const struct gdb_exception &e)
 107 {
 108   if (e.reason < 0 && e.message != NULL)
 109     {
 110       print_flush ();
 111       print_exception (file, e);
 112     }
 113 }
 114
 115 void
 116 exception_fprintf (struct ui_file *file, const struct gdb_exception &e,
 117                    const char *prefix, ...)
 118 {
 119   if (e.reason < 0 && e.message != NULL)
 120     {
 121       va_list args;
 122
 123       print_flush ();
 124
 125       /* Print the prefix.  */
 126       va_start (args, prefix);
 127       gdb_vprintf (file, prefix, args);
 128       va_end (args);
 129
 130       print_exception (file, e);
 131     }
 132 }