gdb/event-top.h

   1 /* Definitions used by event-top.c, for GDB, the GNU debugger.
   2
   3    Copyright 1999, 2001, 2003 Free Software Foundation, Inc.
   4
   5    Written by Elena Zannoni <ezannoni@cygnus.com> of Cygnus Solutions.
   6
   7    This file is part of GDB.
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 2 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program; if not, write to the Free Software
  21    Foundation, Inc., 59 Temple Place - Suite 330,
  22    Boston, MA 02111-1307, USA.  */
  23
  24 #ifndef EVENT_TOP_H
  25 #define EVENT_TOP_H
  26
  27 struct cmd_list_element;
  28
  29 /* Stack for prompts.  Each prompt is composed as a prefix, a prompt
  30    and a suffix.  The prompt to be displayed at any given time is the
  31    one on top of the stack.  A stack is necessary because of cases in
  32    which the execution of a gdb command requires further input from
  33    the user, like for instance 'commands' for breakpoints and
  34    'actions' for tracepoints.  In these cases, the prompt is '>' and
  35    gdb should process input using the asynchronous readline interface
  36    and the event loop.  In order to achieve this, we need to save
  37    somewhere the state of GDB, i.e. that it is processing user input
  38    as part of a command and not as part of the top level command loop.
  39    The prompt stack represents part of the saved state.  Another part
  40    would be the function that readline would invoke after a whole line
  41    of input has ben entered.  This second piece would be something
  42    like, for instance, where to return within the code for the actions
  43    commands after a line has been read.  This latter portion has not
  44    beeen implemented yet.  The need for a 3-part prompt arises from
  45    the annotation level.  When this is set to 2, the prompt is
  46    actually composed of a prefix, the prompt itself and a suffix.  */
  47
  48 /* At any particular time there will be always at least one prompt on
  49    the stack, the one being currently displayed by gdb.  If gdb is
  50    using annotation level equal 2, there will be 2 prompts on the
  51    stack: the usual one, w/o prefix and suffix (at top - 1), and the
  52    'composite' one with prefix and suffix added (at top).  At this
  53    time, this is the only use of the prompt stack.  Resetting annotate
  54    to 0 or 1, pops the top of the stack, resetting its size to one
  55    element.  The MAXPROMPTS limit is safe, for now.  Once other cases
  56    are dealt with (like the different prompts used for 'commands' or
  57    'actions') this array implementation of the prompt stack may have
  58    to change.  */
  59
  60 #define MAXPROMPTS 10
  61 struct prompts
  62   {
  63     struct
  64       {
  65         char *prefix;
  66         char *prompt;
  67         char *suffix;
  68       }
  69     prompt_stack[MAXPROMPTS];
  70     int top;
  71   };
  72
  73 #define PROMPT(X) the_prompts.prompt_stack[the_prompts.top + X].prompt
  74 #define PREFIX(X) the_prompts.prompt_stack[the_prompts.top + X].prefix
  75 #define SUFFIX(X) the_prompts.prompt_stack[the_prompts.top + X].suffix
  76
  77 /* Exported functions from event-top.c.
  78    FIXME: these should really go into top.h.  */
  79
  80 extern void display_gdb_prompt (char *new_prompt);
  81 void gdb_setup_readline (void);
  82 void gdb_disable_readline (void);
  83 extern void async_init_signals (void);
  84 extern void set_async_editing_command (char *args, int from_tty,
  85                                        struct cmd_list_element *c);
  86 extern void set_async_annotation_level (char *args, int from_tty,
  87                                         struct cmd_list_element *c);
  88 extern void set_async_prompt (char *args, int from_tty,
  89                               struct cmd_list_element *c);
  90
  91 /* Signal to catch ^Z typed while reading a command: SIGTSTP or SIGCONT.  */
  92 #ifndef STOP_SIGNAL
  93 #include <signal.h>
  94 #ifdef SIGTSTP
  95 #define STOP_SIGNAL SIGTSTP
  96 extern void handle_stop_sig (int sig);
  97 #endif
  98 #endif
  99 extern void handle_sigint (int sig);
 100 extern void pop_prompt (void);
 101 extern void push_prompt (char *prefix, char *prompt, char *suffix);
 102 extern void gdb_readline2 (void *client_data);
 103 extern void mark_async_signal_handler_wrapper (void *token);
 104 extern void async_request_quit (void *arg);
 105 extern void stdin_event_handler (int error, void *client_data);
 106 extern void async_disable_stdin (void);
 107 extern void async_enable_stdin (void *dummy);
 108
 109 /* Exported variables from event-top.c.
 110    FIXME: these should really go into top.h.  */
 111
 112 extern int async_command_editing_p;
 113 extern int exec_done_display_p;
 114 extern char *async_annotation_suffix;
 115 extern char *new_async_prompt;
 116 extern struct prompts the_prompts;
 117 extern void (*call_readline) (void *);
 118 extern void (*input_handler) (char *);
 119 extern int input_fd;
 120 extern void (*after_char_processing_hook) (void);
 121
 122 extern void cli_command_loop (void);
 123
 124 #endif