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. 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 10 the Free Software Foundation; either version 3 of the License, or 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 19 along with this program. If not, see <http://www.gnu.org/licenses/>. */ 20 21 #include "defs.h" 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" 26 #include "inf-loop.h" 27 #include "remote.h" 28 #include "exceptions.h" 29 #include "language.h" 30 #include "gdbthread.h" 31 32 static int fetch_inferior_event_wrapper (gdb_client_data client_data); 33 34 void 35 inferior_event_handler_wrapper (gdb_client_data client_data) 36 { 37 inferior_event_handler (INF_QUIT_REQ, client_data); 38 } 39 40 /* General function to handle events in the inferior. So far it just 41 takes care of detecting errors reported by select() or poll(), 42 otherwise it assumes that all is OK, and goes on reading data from 43 the fd. This however may not always be what we want to do. */ 44 void 45 inferior_event_handler (enum inferior_event_type event_type, 46 gdb_client_data client_data) 47 { 48 struct gdb_exception e; 49 int was_sync = 0; 50 51 switch (event_type) 52 { 53 case INF_ERROR: 54 printf_unfiltered (_("error detected from target.\n")); 55 pop_all_targets_above (file_stratum, 0); 56 discard_all_intermediate_continuations (); 57 discard_all_continuations (); 58 async_enable_stdin (); 59 break; 60 61 case INF_REG_EVENT: 62 /* Use catch errors for now, until the inner layers of 63 fetch_inferior_event (i.e. readchar) can return meaningful 64 error status. If an error occurs while getting an event from 65 the target, just get rid of the target. */ 66 if (!catch_errors (fetch_inferior_event_wrapper, 67 client_data, "", RETURN_MASK_ALL)) 68 { 69 pop_all_targets_above (file_stratum, 0); 70 discard_all_intermediate_continuations (); 71 discard_all_continuations (); 72 async_enable_stdin (); 73 display_gdb_prompt (0); 74 } 75 break; 76 77 case INF_EXEC_COMPLETE: 78 79 if (!non_stop) 80 { 81 /* Unregister the inferior from the event loop. This is done 82 so that when the inferior is not running we don't get 83 distracted by spurious inferior output. */ 84 if (target_has_execution) 85 target_async (NULL, 0); 86 } 87 88 /* The call to async_enable_stdin below resets 'sync_execution'. 89 However, if sync_execution is 1 now, we also need to show the 90 prompt below, so save the current value. */ 91 was_sync = sync_execution; 92 async_enable_stdin (); 93 94 /* Do all continuations associated with the whole inferior (not 95 a particular thread). */ 96 if (!ptid_equal (inferior_ptid, null_ptid)) 97 do_all_inferior_continuations (); 98 99 /* If we were doing a multi-step (eg: step n, next n), but it 100 got interrupted by a breakpoint, still do the pending 101 continuations. The continuation itself is responsible for 102 distinguishing the cases. The continuations are allowed to 103 touch the inferior memory, e.g. to remove breakpoints, so run 104 them before running breakpoint commands, which may resume the 105 target. */ 106 if (non_stop 107 && target_has_execution 108 && !ptid_equal (inferior_ptid, null_ptid)) 109 do_all_intermediate_continuations_thread (inferior_thread ()); 110 else 111 do_all_intermediate_continuations (); 112 113 /* Always finish the previous command before running any 114 breakpoint commands. Any stop cancels the previous command. 115 E.g. a "finish" or "step-n" command interrupted by an 116 unrelated breakpoint is canceled. */ 117 if (non_stop 118 && target_has_execution 119 && !ptid_equal (inferior_ptid, null_ptid)) 120 do_all_continuations_thread (inferior_thread ()); 121 else 122 do_all_continuations (); 123 124 if (current_language != expected_language 125 && language_mode == language_mode_auto) 126 language_info (1); /* Print what changed. */ 127 128 /* Don't propagate breakpoint commands errors. Either we're 129 stopping or some command resumes the inferior. The user will 130 be informed. */ 131 TRY_CATCH (e, RETURN_MASK_ALL) 132 { 133 bpstat_do_actions (); 134 } 135 136 if (!was_sync 137 && exec_done_display_p 138 && (ptid_equal (inferior_ptid, null_ptid) 139 || !is_running (inferior_ptid))) 140 printf_unfiltered (_("completed.\n")); 141 break; 142 143 case INF_EXEC_CONTINUE: 144 /* Is there anything left to do for the command issued to 145 complete? */ 146 147 if (non_stop) 148 do_all_intermediate_continuations_thread (inferior_thread ()); 149 else 150 do_all_intermediate_continuations (); 151 break; 152 153 case INF_QUIT_REQ: 154 /* FIXME: ezannoni 1999-10-04. This call should really be a 155 target vector entry, so that it can be used for any kind of 156 targets. */ 157 async_remote_interrupt_twice (NULL); 158 break; 159 160 case INF_TIMER: 161 default: 162 printf_unfiltered (_("Event type not recognized.\n")); 163 break; 164 } 165 } 166 167 static int 168 fetch_inferior_event_wrapper (gdb_client_data client_data) 169 { 170 fetch_inferior_event (client_data); 171 return 1; 172 } 173