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2acceee2 | 1 | /* Handling of inferior events for the event loop for GDB, the GNU debugger. |
7b6bb8da JB |
2 | Copyright (C) 1999, 2007, 2008, 2009, 2010, 2011 |
3 | Free Software Foundation, Inc. | |
2acceee2 JM |
4 | Written by Elena Zannoni <ezannoni@cygnus.com> of Cygnus Solutions. |
5 | ||
6 | This file is part of GDB. | |
7 | ||
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 | |
a9762ec7 | 10 | the Free Software Foundation; either version 3 of the License, or |
2acceee2 JM |
11 | (at your option) any later version. |
12 | ||
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. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
1777feb0 | 19 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
2acceee2 JM |
20 | |
21 | #include "defs.h" | |
1777feb0 MS |
22 | #include "inferior.h" /* For fetch_inferior_event. */ |
23 | #include "target.h" /* For enum inferior_event_type. */ | |
2acceee2 JM |
24 | #include "event-loop.h" |
25 | #include "event-top.h" | |
26 | #include "inf-loop.h" | |
b18392ef | 27 | #include "remote.h" |
60250e8b | 28 | #include "exceptions.h" |
32c1e744 | 29 | #include "language.h" |
8ea051c5 | 30 | #include "gdbthread.h" |
be34f849 | 31 | #include "continuations.h" |
2acceee2 JM |
32 | |
33 | static int fetch_inferior_event_wrapper (gdb_client_data client_data); | |
2acceee2 | 34 | |
1777feb0 | 35 | /* General function to handle events in the inferior. So far it just |
2acceee2 JM |
36 | takes care of detecting errors reported by select() or poll(), |
37 | otherwise it assumes that all is OK, and goes on reading data from | |
1777feb0 | 38 | the fd. This however may not always be what we want to do. */ |
2acceee2 JM |
39 | void |
40 | inferior_event_handler (enum inferior_event_type event_type, | |
41 | gdb_client_data client_data) | |
42 | { | |
fcfb8b02 | 43 | struct gdb_exception e; |
32c1e744 | 44 | int was_sync = 0; |
353d1d73 | 45 | struct cleanup *cleanup_if_error = make_bpstat_clear_actions_cleanup (); |
abbb1732 | 46 | |
2acceee2 JM |
47 | switch (event_type) |
48 | { | |
2acceee2 JM |
49 | case INF_REG_EVENT: |
50 | /* Use catch errors for now, until the inner layers of | |
51 | fetch_inferior_event (i.e. readchar) can return meaningful | |
52 | error status. If an error occurs while getting an event from | |
fa4cd53f | 53 | the target, just cancel the current command. */ |
2acceee2 JM |
54 | if (!catch_errors (fetch_inferior_event_wrapper, |
55 | client_data, "", RETURN_MASK_ALL)) | |
56 | { | |
353d1d73 | 57 | bpstat_clear_actions (); |
fa4cd53f PA |
58 | do_all_intermediate_continuations (1); |
59 | do_all_continuations (1); | |
712af3be | 60 | async_enable_stdin (); |
2acceee2 JM |
61 | display_gdb_prompt (0); |
62 | } | |
63 | break; | |
64 | ||
65 | case INF_EXEC_COMPLETE: | |
94cc34af PA |
66 | |
67 | if (!non_stop) | |
68 | { | |
1777feb0 | 69 | /* Unregister the inferior from the event loop. This is done |
94cc34af PA |
70 | so that when the inferior is not running we don't get |
71 | distracted by spurious inferior output. */ | |
72 | if (target_has_execution) | |
73 | target_async (NULL, 0); | |
74 | } | |
32c1e744 | 75 | |
712af3be VP |
76 | /* The call to async_enable_stdin below resets 'sync_execution'. |
77 | However, if sync_execution is 1 now, we also need to show the | |
78 | prompt below, so save the current value. */ | |
32c1e744 | 79 | was_sync = sync_execution; |
712af3be | 80 | async_enable_stdin (); |
32c1e744 | 81 | |
e0ba6746 PA |
82 | /* Do all continuations associated with the whole inferior (not |
83 | a particular thread). */ | |
84 | if (!ptid_equal (inferior_ptid, null_ptid)) | |
fa4cd53f | 85 | do_all_inferior_continuations (0); |
e0ba6746 | 86 | |
0a320680 PA |
87 | /* If we were doing a multi-step (eg: step n, next n), but it |
88 | got interrupted by a breakpoint, still do the pending | |
89 | continuations. The continuation itself is responsible for | |
02b19d84 PA |
90 | distinguishing the cases. The continuations are allowed to |
91 | touch the inferior memory, e.g. to remove breakpoints, so run | |
92 | them before running breakpoint commands, which may resume the | |
93 | target. */ | |
95e54da7 PA |
94 | if (non_stop |
95 | && target_has_execution | |
96 | && !ptid_equal (inferior_ptid, null_ptid)) | |
fa4cd53f | 97 | do_all_intermediate_continuations_thread (inferior_thread (), 0); |
95e54da7 | 98 | else |
fa4cd53f | 99 | do_all_intermediate_continuations (0); |
0a320680 | 100 | |
02b19d84 PA |
101 | /* Always finish the previous command before running any |
102 | breakpoint commands. Any stop cancels the previous command. | |
103 | E.g. a "finish" or "step-n" command interrupted by an | |
104 | unrelated breakpoint is canceled. */ | |
95e54da7 PA |
105 | if (non_stop |
106 | && target_has_execution | |
107 | && !ptid_equal (inferior_ptid, null_ptid)) | |
fa4cd53f | 108 | do_all_continuations_thread (inferior_thread (), 0); |
95e54da7 | 109 | else |
fa4cd53f | 110 | do_all_continuations (0); |
32c1e744 | 111 | |
46cf51e6 PA |
112 | if (info_verbose |
113 | && current_language != expected_language | |
02b19d84 PA |
114 | && language_mode == language_mode_auto) |
115 | language_info (1); /* Print what changed. */ | |
116 | ||
117 | /* Don't propagate breakpoint commands errors. Either we're | |
118 | stopping or some command resumes the inferior. The user will | |
119 | be informed. */ | |
120 | TRY_CATCH (e, RETURN_MASK_ALL) | |
32c1e744 | 121 | { |
347bddb7 | 122 | bpstat_do_actions (); |
32c1e744 | 123 | } |
a4f2ce05 | 124 | exception_print (gdb_stderr, e); |
32c1e744 | 125 | |
7b0e8051 PA |
126 | if (!was_sync |
127 | && exec_done_display_p | |
128 | && (ptid_equal (inferior_ptid, null_ptid) | |
129 | || !is_running (inferior_ptid))) | |
4f8d22e3 | 130 | printf_unfiltered (_("completed.\n")); |
2acceee2 JM |
131 | break; |
132 | ||
c2d11a7d JM |
133 | case INF_EXEC_CONTINUE: |
134 | /* Is there anything left to do for the command issued to | |
1777feb0 | 135 | complete? */ |
95e54da7 PA |
136 | |
137 | if (non_stop) | |
fa4cd53f | 138 | do_all_intermediate_continuations_thread (inferior_thread (), 0); |
95e54da7 | 139 | else |
fa4cd53f | 140 | do_all_intermediate_continuations (0); |
c2d11a7d JM |
141 | break; |
142 | ||
2acceee2 JM |
143 | case INF_TIMER: |
144 | default: | |
a3f17187 | 145 | printf_unfiltered (_("Event type not recognized.\n")); |
2acceee2 JM |
146 | break; |
147 | } | |
353d1d73 JK |
148 | |
149 | discard_cleanups (cleanup_if_error); | |
2acceee2 JM |
150 | } |
151 | ||
152 | static int | |
153 | fetch_inferior_event_wrapper (gdb_client_data client_data) | |
154 | { | |
155 | fetch_inferior_event (client_data); | |
156 | return 1; | |
157 | } |