1 /* Handling of inferior events for the event loop for GDB, the GNU debugger.
2 Copyright (C) 1999, 2007, 2008, 2009, 2010, 2011
3 Free Software Foundation, Inc.
4 Written by Elena Zannoni <ezannoni@cygnus.com> of Cygnus Solutions.
6 This file is part of GDB.
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program. If not, see <http://www.gnu.org/licenses/>. */
22 #include "inferior.h" /* For fetch_inferior_event. */
23 #include "target.h" /* For enum inferior_event_type. */
24 #include "event-loop.h"
25 #include "event-top.h"
28 #include "exceptions.h"
30 #include "gdbthread.h"
31 #include "continuations.h"
33 static int fetch_inferior_event_wrapper (gdb_client_data client_data);
36 inferior_event_handler_wrapper (gdb_client_data client_data)
38 inferior_event_handler (INF_QUIT_REQ, client_data);
41 /* General function to handle events in the inferior. So far it just
42 takes care of detecting errors reported by select() or poll(),
43 otherwise it assumes that all is OK, and goes on reading data from
44 the fd. This however may not always be what we want to do. */
46 inferior_event_handler (enum inferior_event_type event_type,
47 gdb_client_data client_data)
49 struct gdb_exception e;
55 printf_unfiltered (_("error detected from target.\n"));
56 pop_all_targets_above (file_stratum, 0);
57 discard_all_intermediate_continuations ();
58 discard_all_continuations ();
59 async_enable_stdin ();
63 /* Use catch errors for now, until the inner layers of
64 fetch_inferior_event (i.e. readchar) can return meaningful
65 error status. If an error occurs while getting an event from
66 the target, just get rid of the target. */
67 if (!catch_errors (fetch_inferior_event_wrapper,
68 client_data, "", RETURN_MASK_ALL))
70 pop_all_targets_above (file_stratum, 0);
71 discard_all_intermediate_continuations ();
72 discard_all_continuations ();
73 async_enable_stdin ();
74 display_gdb_prompt (0);
78 case INF_EXEC_COMPLETE:
82 /* Unregister the inferior from the event loop. This is done
83 so that when the inferior is not running we don't get
84 distracted by spurious inferior output. */
85 if (target_has_execution)
86 target_async (NULL, 0);
89 /* The call to async_enable_stdin below resets 'sync_execution'.
90 However, if sync_execution is 1 now, we also need to show the
91 prompt below, so save the current value. */
92 was_sync = sync_execution;
93 async_enable_stdin ();
95 /* Do all continuations associated with the whole inferior (not
96 a particular thread). */
97 if (!ptid_equal (inferior_ptid, null_ptid))
98 do_all_inferior_continuations ();
100 /* If we were doing a multi-step (eg: step n, next n), but it
101 got interrupted by a breakpoint, still do the pending
102 continuations. The continuation itself is responsible for
103 distinguishing the cases. The continuations are allowed to
104 touch the inferior memory, e.g. to remove breakpoints, so run
105 them before running breakpoint commands, which may resume the
108 && target_has_execution
109 && !ptid_equal (inferior_ptid, null_ptid))
110 do_all_intermediate_continuations_thread (inferior_thread ());
112 do_all_intermediate_continuations ();
114 /* Always finish the previous command before running any
115 breakpoint commands. Any stop cancels the previous command.
116 E.g. a "finish" or "step-n" command interrupted by an
117 unrelated breakpoint is canceled. */
119 && target_has_execution
120 && !ptid_equal (inferior_ptid, null_ptid))
121 do_all_continuations_thread (inferior_thread ());
123 do_all_continuations ();
126 && current_language != expected_language
127 && language_mode == language_mode_auto)
128 language_info (1); /* Print what changed. */
130 /* Don't propagate breakpoint commands errors. Either we're
131 stopping or some command resumes the inferior. The user will
133 TRY_CATCH (e, RETURN_MASK_ALL)
135 bpstat_do_actions ();
139 && exec_done_display_p
140 && (ptid_equal (inferior_ptid, null_ptid)
141 || !is_running (inferior_ptid)))
142 printf_unfiltered (_("completed.\n"));
145 case INF_EXEC_CONTINUE:
146 /* Is there anything left to do for the command issued to
150 do_all_intermediate_continuations_thread (inferior_thread ());
152 do_all_intermediate_continuations ();
156 /* FIXME: ezannoni 1999-10-04. This call should really be a
157 target vector entry, so that it can be used for any kind of
159 async_remote_interrupt_twice (NULL);
164 printf_unfiltered (_("Event type not recognized.\n"));
170 fetch_inferior_event_wrapper (gdb_client_data client_data)
172 fetch_inferior_event (client_data);