gdb/exceptions.c

   1 /* Exception (throw catch) mechanism, for GDB, the GNU debugger.
   2
   3    Copyright (C) 1986-2024 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 "exceptions.h"
  21 #include "breakpoint.h"
  22 #include "target.h"
  23 #include "inferior.h"
  24 #include "annotate.h"
  25 #include "ui-out.h"
  26 #include "serial.h"
  27 #include "gdbthread.h"
  28 #include "ui.h"
  29 #include <optional>
  30
  31 static void
  32 print_flush (void)
  33 {
  34   struct ui *ui = current_ui;
  35   struct serial *gdb_stdout_serial;
  36
  37   if (deprecated_error_begin_hook)
  38     deprecated_error_begin_hook ();
  39
  40   std::optional<target_terminal::scoped_restore_terminal_state> term_state;
  41   if (target_supports_terminal_ours ())
  42     {
  43       term_state.emplace ();
  44       target_terminal::ours_for_output ();
  45     }
  46
  47   /* We want all output to appear now, before we print the error.  We
  48      have 2 levels of buffering we have to flush (it's possible that
  49      some of these should be changed to flush the lower-level ones
  50      too):  */
  51
  52   /* 1.  The stdio buffer.  */
  53   gdb_flush (gdb_stdout);
  54   gdb_flush (gdb_stderr);
  55
  56   /* 2.  The system-level buffer.  */
  57   gdb_stdout_serial = serial_fdopen (fileno (ui->outstream));
  58   if (gdb_stdout_serial)
  59     {
  60       serial_drain_output (gdb_stdout_serial);
  61       serial_un_fdopen (gdb_stdout_serial);
  62     }
  63
  64   annotate_error_begin ();
  65 }
  66
  67 static void
  68 print_exception (struct ui_file *file, const struct gdb_exception &e)
  69 {
  70   /* KLUDGE: cagney/2005-01-13: Write the string out one line at a time
  71      as that way the MI's behavior is preserved.  */
  72   const char *start;
  73   const char *end;
  74
  75   for (start = e.what (); start != NULL; start = end)
  76     {
  77       end = strchr (start, '\n');
  78       if (end == NULL)
  79         gdb_puts (start, file);
  80       else
  81         {
  82           end++;
  83           file->write (start, end - start);
  84         }
  85     }
  86   gdb_printf (file, "\n");
  87
  88   /* Now append the annotation.  */
  89   switch (e.reason)
  90     {
  91     case RETURN_QUIT:
  92     case RETURN_FORCED_QUIT:
  93       annotate_quit ();
  94       break;
  95     case RETURN_ERROR:
  96       /* Assume that these are all errors.  */
  97       annotate_error ();
  98       break;
  99     default:
 100       internal_error (_("Bad switch."));
 101     }
 102 }
 103
 104 void
 105 exception_print (struct ui_file *file, const struct gdb_exception &e)
 106 {
 107   if (e.reason < 0 && e.message != NULL)
 108     {
 109       print_flush ();
 110       print_exception (file, e);
 111     }
 112 }
 113
 114 void
 115 exception_fprintf (struct ui_file *file, const struct gdb_exception &e,
 116                    const char *prefix, ...)
 117 {
 118   if (e.reason < 0 && e.message != NULL)
 119     {
 120       va_list args;
 121
 122       print_flush ();
 123
 124       /* Print the prefix.  */
 125       va_start (args, prefix);
 126       gdb_vprintf (file, prefix, args);
 127       va_end (args);
 128
 129       print_exception (file, e);
 130     }
 131 }