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/tmp/gdb-7.10/gdb/inf-loop.c
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1 /* Handling of inferior events for the event loop for GDB, the GNU debugger.
2  Copyright (C) 1999-2015 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"
22 #include "infrun.h"
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 "language.h"
29 #include "gdbthread.h"
30 #include "continuations.h"
31 #include "interps.h"
32 #include "top.h"
33 #include "observer.h"
34 
35 /* General function to handle events in the inferior. So far it just
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
38  the fd. This however may not always be what we want to do. */
39 void
41  gdb_client_data client_data)
42 {
43  struct cleanup *cleanup_if_error = make_bpstat_clear_actions_cleanup ();
44 
45  switch (event_type)
46  {
47  case INF_REG_EVENT:
48  /* Catch errors for now, until the inner layers of
49  fetch_inferior_event (i.e. readchar) can return meaningful
50  error status. If an error occurs while getting an event from
51  the target, just cancel the current command. */
52  {
53 
54  TRY
55  {
56  fetch_inferior_event (client_data);
57  }
59  {
63 
64  throw_exception (ex);
65  }
66  END_CATCH
67  }
68  break;
69 
70  case INF_EXEC_COMPLETE:
71  if (!non_stop)
72  {
73  /* Unregister the inferior from the event loop. This is done
74  so that when the inferior is not running we don't get
75  distracted by spurious inferior output. */
77  target_async (0);
78  }
79 
80  /* Do all continuations associated with the whole inferior (not
81  a particular thread). */
84 
85  /* If we were doing a multi-step (eg: step n, next n), but it
86  got interrupted by a breakpoint, still do the pending
87  continuations. The continuation itself is responsible for
88  distinguishing the cases. The continuations are allowed to
89  touch the inferior memory, e.g. to remove breakpoints, so run
90  them before running breakpoint commands, which may resume the
91  target. */
92  if (non_stop
96  else
98 
99  /* Always finish the previous command before running any
100  breakpoint commands. Any stop cancels the previous command.
101  E.g. a "finish" or "step-n" command interrupted by an
102  unrelated breakpoint is canceled. */
103  if (non_stop
107  else
109 
110  /* When running a command list (from a user command, say), these
111  are only run when the command list is all done. */
112  if (interpreter_async)
113  {
114 
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
121  {
123  }
125  {
127  }
128  END_CATCH
129  }
130  break;
131 
132  case INF_EXEC_CONTINUE:
133  /* Is there anything left to do for the command issued to
134  complete? */
135 
136  if (non_stop)
138  else
140  break;
141 
142  case INF_TIMER:
143  default:
144  printf_unfiltered (_("Event type not recognized.\n"));
145  break;
146  }
147 
148  discard_cleanups (cleanup_if_error);
149 }
void do_all_intermediate_continuations_thread(struct thread_info *thread, int err)
void do_all_intermediate_continuations(int err)
int ptid_equal(ptid_t ptid1, ptid_t ptid2)
Definition: ptid.c:76
void bpstat_clear_actions(void)
Definition: breakpoint.c:4508
struct thread_info * inferior_thread(void)
Definition: thread.c:85
#define _(String)
Definition: gdb_locale.h:40
#define END_CATCH
#define TRY
#define CATCH(EXCEPTION, MASK)
void inferior_event_handler(enum inferior_event_type event_type, gdb_client_data client_data)
Definition: inf-loop.c:40
void do_all_continuations_thread(struct thread_info *thread, int err)
void exception_print(struct ui_file *file, struct gdb_exception e)
Definition: exceptions.c:109
int interpreter_async
Definition: interps.c:46
#define target_has_execution
Definition: target.h:1726
void printf_unfiltered(const char *format,...)
Definition: utils.c:2399
void * gdb_client_data
Definition: event-loop.h:70
void fetch_inferior_event(void *client_data)
Definition: infrun.c:3257
inferior_event_type
Definition: target.h:117
void throw_exception(struct gdb_exception exception)
void discard_cleanups(struct cleanup *old_chain)
Definition: cleanups.c:213
int non_stop
Definition: infrun.c:180
ptid_t null_ptid
Definition: ptid.c:25
void check_frame_language_change(void)
Definition: top.c:330
struct cleanup * make_bpstat_clear_actions_cleanup(void)
Definition: utils.c:3137
struct ui_file * gdb_stderr
Definition: main.c:72
ptid_t inferior_ptid
Definition: infcmd.c:124
void do_all_inferior_continuations(int err)
void bpstat_do_actions(void)
Definition: breakpoint.c:4668
#define target_async(ENABLE)
Definition: target.h:1754
void do_all_continuations(int err)