1 /* Handling of inferior events for the event loop for GDB, the GNU debugger. 2 Copyright (C) 1999, 2007, 2008, 2009 Free Software Foundation, Inc. 3 Written by Elena Zannoni <ezannoni@cygnus.com> of Cygnus Solutions. 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 "inferior.h" /* For fetch_inferior_event. */ 22 #include "target.h" /* For enum inferior_event_type. */ 23 #include "event-loop.h" 24 #include "event-top.h" 25 #include "inf-loop.h" 26 #include "remote.h" 27 #include "exceptions.h" 28 #include "language.h" 29 #include "gdbthread.h" 30 31 static int fetch_inferior_event_wrapper (gdb_client_data client_data); 32 33 void 34 inferior_event_handler_wrapper (gdb_client_data client_data) 35 { 36 inferior_event_handler (INF_QUIT_REQ, client_data); 37 } 38 39 /* General function to handle events in the inferior. So far it just 40 takes care of detecting errors reported by select() or poll(), 41 otherwise it assumes that all is OK, and goes on reading data from 42 the fd. This however may not always be what we want to do. */ 43 void 44 inferior_event_handler (enum inferior_event_type event_type, 45 gdb_client_data client_data) 46 { 47 struct gdb_exception e; 48 int was_sync = 0; 49 switch (event_type) 50 { 51 case INF_ERROR: 52 printf_unfiltered (_("error detected from target.\n")); 53 pop_all_targets_above (file_stratum, 0); 54 discard_all_intermediate_continuations (); 55 discard_all_continuations (); 56 async_enable_stdin (); 57 break; 58 59 case INF_REG_EVENT: 60 /* Use catch errors for now, until the inner layers of 61 fetch_inferior_event (i.e. readchar) can return meaningful 62 error status. If an error occurs while getting an event from 63 the target, just get rid of the target. */ 64 if (!catch_errors (fetch_inferior_event_wrapper, 65 client_data, "", RETURN_MASK_ALL)) 66 { 67 pop_all_targets_above (file_stratum, 0); 68 discard_all_intermediate_continuations (); 69 discard_all_continuations (); 70 async_enable_stdin (); 71 display_gdb_prompt (0); 72 } 73 break; 74 75 case INF_EXEC_COMPLETE: 76 77 if (!non_stop) 78 { 79 /* Unregister the inferior from the event loop. This is done 80 so that when the inferior is not running we don't get 81 distracted by spurious inferior output. */ 82 if (target_has_execution) 83 target_async (NULL, 0); 84 } 85 86 /* The call to async_enable_stdin below resets 'sync_execution'. 87 However, if sync_execution is 1 now, we also need to show the 88 prompt below, so save the current value. */ 89 was_sync = sync_execution; 90 async_enable_stdin (); 91 92 /* Do all continuations associated with the whole inferior (not 93 a particular thread). */ 94 if (!ptid_equal (inferior_ptid, null_ptid)) 95 do_all_inferior_continuations (); 96 97 /* If we were doing a multi-step (eg: step n, next n), but it 98 got interrupted by a breakpoint, still do the pending 99 continuations. The continuation itself is responsible for 100 distinguishing the cases. The continuations are allowed to 101 touch the inferior memory, e.g. to remove breakpoints, so run 102 them before running breakpoint commands, which may resume the 103 target. */ 104 if (non_stop 105 && target_has_execution 106 && !ptid_equal (inferior_ptid, null_ptid)) 107 do_all_intermediate_continuations_thread (inferior_thread ()); 108 else 109 do_all_intermediate_continuations (); 110 111 /* Always finish the previous command before running any 112 breakpoint commands. Any stop cancels the previous command. 113 E.g. a "finish" or "step-n" command interrupted by an 114 unrelated breakpoint is canceled. */ 115 if (non_stop 116 && target_has_execution 117 && !ptid_equal (inferior_ptid, null_ptid)) 118 do_all_continuations_thread (inferior_thread ()); 119 else 120 do_all_continuations (); 121 122 if (current_language != expected_language 123 && language_mode == language_mode_auto) 124 language_info (1); /* Print what changed. */ 125 126 /* Don't propagate breakpoint commands errors. Either we're 127 stopping or some command resumes the inferior. The user will 128 be informed. */ 129 TRY_CATCH (e, RETURN_MASK_ALL) 130 { 131 bpstat_do_actions (); 132 } 133 134 if (!was_sync 135 && exec_done_display_p 136 && (ptid_equal (inferior_ptid, null_ptid) 137 || !is_running (inferior_ptid))) 138 printf_unfiltered (_("completed.\n")); 139 break; 140 141 case INF_EXEC_CONTINUE: 142 /* Is there anything left to do for the command issued to 143 complete? */ 144 145 if (non_stop) 146 do_all_intermediate_continuations_thread (inferior_thread ()); 147 else 148 do_all_intermediate_continuations (); 149 break; 150 151 case INF_QUIT_REQ: 152 /* FIXME: ezannoni 1999-10-04. This call should really be a 153 target vector entry, so that it can be used for any kind of 154 targets. */ 155 async_remote_interrupt_twice (NULL); 156 break; 157 158 case INF_TIMER: 159 default: 160 printf_unfiltered (_("Event type not recognized.\n")); 161 break; 162 } 163 } 164 165 static int 166 fetch_inferior_event_wrapper (gdb_client_data client_data) 167 { 168 fetch_inferior_event (client_data); 169 return 1; 170 } 171