1 /* Handling of inferior events for the event loop for GDB, the GNU debugger. 2 Copyright (C) 1999, 2007, 2008, 2009, 2010 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 50 switch (event_type) 51 { 52 case INF_ERROR: 53 printf_unfiltered (_("error detected from target.\n")); 54 pop_all_targets_above (file_stratum, 0); 55 discard_all_intermediate_continuations (); 56 discard_all_continuations (); 57 async_enable_stdin (); 58 break; 59 60 case INF_REG_EVENT: 61 /* Use catch errors for now, until the inner layers of 62 fetch_inferior_event (i.e. readchar) can return meaningful 63 error status. If an error occurs while getting an event from 64 the target, just get rid of the target. */ 65 if (!catch_errors (fetch_inferior_event_wrapper, 66 client_data, "", RETURN_MASK_ALL)) 67 { 68 pop_all_targets_above (file_stratum, 0); 69 discard_all_intermediate_continuations (); 70 discard_all_continuations (); 71 async_enable_stdin (); 72 display_gdb_prompt (0); 73 } 74 break; 75 76 case INF_EXEC_COMPLETE: 77 78 if (!non_stop) 79 { 80 /* Unregister the inferior from the event loop. This is done 81 so that when the inferior is not running we don't get 82 distracted by spurious inferior output. */ 83 if (target_has_execution) 84 target_async (NULL, 0); 85 } 86 87 /* The call to async_enable_stdin below resets 'sync_execution'. 88 However, if sync_execution is 1 now, we also need to show the 89 prompt below, so save the current value. */ 90 was_sync = sync_execution; 91 async_enable_stdin (); 92 93 /* Do all continuations associated with the whole inferior (not 94 a particular thread). */ 95 if (!ptid_equal (inferior_ptid, null_ptid)) 96 do_all_inferior_continuations (); 97 98 /* If we were doing a multi-step (eg: step n, next n), but it 99 got interrupted by a breakpoint, still do the pending 100 continuations. The continuation itself is responsible for 101 distinguishing the cases. The continuations are allowed to 102 touch the inferior memory, e.g. to remove breakpoints, so run 103 them before running breakpoint commands, which may resume the 104 target. */ 105 if (non_stop 106 && target_has_execution 107 && !ptid_equal (inferior_ptid, null_ptid)) 108 do_all_intermediate_continuations_thread (inferior_thread ()); 109 else 110 do_all_intermediate_continuations (); 111 112 /* Always finish the previous command before running any 113 breakpoint commands. Any stop cancels the previous command. 114 E.g. a "finish" or "step-n" command interrupted by an 115 unrelated breakpoint is canceled. */ 116 if (non_stop 117 && target_has_execution 118 && !ptid_equal (inferior_ptid, null_ptid)) 119 do_all_continuations_thread (inferior_thread ()); 120 else 121 do_all_continuations (); 122 123 if (current_language != expected_language 124 && language_mode == language_mode_auto) 125 language_info (1); /* Print what changed. */ 126 127 /* Don't propagate breakpoint commands errors. Either we're 128 stopping or some command resumes the inferior. The user will 129 be informed. */ 130 TRY_CATCH (e, RETURN_MASK_ALL) 131 { 132 bpstat_do_actions (); 133 } 134 135 if (!was_sync 136 && exec_done_display_p 137 && (ptid_equal (inferior_ptid, null_ptid) 138 || !is_running (inferior_ptid))) 139 printf_unfiltered (_("completed.\n")); 140 break; 141 142 case INF_EXEC_CONTINUE: 143 /* Is there anything left to do for the command issued to 144 complete? */ 145 146 if (non_stop) 147 do_all_intermediate_continuations_thread (inferior_thread ()); 148 else 149 do_all_intermediate_continuations (); 150 break; 151 152 case INF_QUIT_REQ: 153 /* FIXME: ezannoni 1999-10-04. This call should really be a 154 target vector entry, so that it can be used for any kind of 155 targets. */ 156 async_remote_interrupt_twice (NULL); 157 break; 158 159 case INF_TIMER: 160 default: 161 printf_unfiltered (_("Event type not recognized.\n")); 162 break; 163 } 164 } 165 166 static int 167 fetch_inferior_event_wrapper (gdb_client_data client_data) 168 { 169 fetch_inferior_event (client_data); 170 return 1; 171 } 172