gdb/top.h

   1 /* Top level stuff for GDB, the GNU debugger.
   2
   3    Copyright (C) 1986-2016 Free Software Foundation, Inc.
   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 #ifndef TOP_H
  21 #define TOP_H
  22
  23 #include "buffer.h"
  24 #include "event-loop.h"
  25
  26 struct tl_interp_info;
  27
  28 /* All about a user interface instance.  Each user interface has its
  29    own I/O files/streams, readline state, its own top level
  30    interpreter (for the main UI, this is the interpreter specified
  31    with -i on the command line) and secondary interpreters (for
  32    interpreter-exec ...), etc.  There's always one UI associated with
  33    stdin/stdout/stderr, but the user can create secondary UIs, for
  34    example, to create a separate MI channel on its own stdio
  35    streams.  */
  36
  37 struct ui
  38 {
  39   /* Pointer to next in singly-linked list.  */
  40   struct ui *next;
  41
  42   /* The UI's command line buffer.  This is to used to accumulate
  43      input until we have a whole command line.  */
  44   struct buffer line_buffer;
  45
  46   /* The callback used by the event loop whenever an event is detected
  47      on the UI's input file descriptor.  This function incrementally
  48      builds a buffer where it accumulates the line read up to the
  49      point of invocation.  In the special case in which the character
  50      read is newline, the function invokes the INPUT_HANDLER callback
  51      (see below).  */
  52   void (*call_readline) (gdb_client_data);
  53
  54   /* The function to invoke when a complete line of input is ready for
  55      processing.  */
  56   void (*input_handler) (char *);
  57
  58   /* Each UI has its own independent set of interpreters.  */
  59   struct ui_interp_info *interp_info;
  60
  61   /* True if the UI is in async mode, false if in sync mode.  If in
  62      sync mode, a synchronous execution command (e.g, "next") does not
  63      return until the command is finished.  If in async mode, then
  64      running a synchronous command returns right after resuming the
  65      target.  Waiting for the command's completion is later done on
  66      the top event loop.  For the main UI, this starts out disabled,
  67      until all the explicit command line arguments (e.g., `gdb -ex
  68      "start" -ex "next"') are processed.  */
  69   int async;
  70
  71   /* stdio stream that command input is being read from.  Set to stdin
  72      normally.  Set by source_command to the file we are sourcing.
  73      Set to NULL if we are executing a user-defined command or
  74      interacting via a GUI.  */
  75   FILE *instream;
  76   /* Standard output stream.  */
  77   FILE *outstream;
  78   /* Standard error stream.  */
  79   FILE *errstream;
  80
  81   /* The file descriptor for the input stream, so that we can register
  82      it with the event loop.  */
  83   int input_fd;
  84
  85   /* The fields below that start with "m_" are "private".  They're
  86      meant to be accessed through wrapper macros that make them look
  87      like globals.  */
  88
  89   /* The ui_file streams.  */
  90   /* Normal results */
  91   struct ui_file *m_gdb_stdout;
  92   /* Input stream */
  93   struct ui_file *m_gdb_stdin;
  94   /* Serious error notifications */
  95   struct ui_file *m_gdb_stderr;
  96   /* Log/debug/trace messages that should bypass normal stdout/stderr
  97      filtering.  For moment, always call this stream using
  98      *_unfiltered.  In the very near future that restriction shall be
  99      removed - either call shall be unfiltered.  (cagney 1999-06-13).  */
 100   struct ui_file *m_gdb_stdlog;
 101
 102   /* The current ui_out.  */
 103   struct ui_out *m_current_uiout;
 104 };
 105
 106 /* The main UI.  This is the UI that is bound to stdin/stdout/stderr.
 107    It always exists and is created automatically when GDB starts
 108    up.  */
 109 extern struct ui *main_ui;
 110
 111 /* The current UI.  */
 112 extern struct ui *current_ui;
 113
 114 /* The list of all UIs.  */
 115 extern struct ui *ui_list;
 116
 117 /* State for SWITCH_THRU_ALL_UIS.  Declared here because it is meant
 118    to be created on the stack, but should be treated as opaque.  */
 119 struct switch_thru_all_uis
 120 {
 121   struct ui *iter;
 122   struct cleanup *old_chain;
 123 };
 124
 125 /* Functions to drive SWITCH_THRU_ALL_UIS.  Though declared here by
 126    necessity, these functions should not be used other than via the
 127    SWITCH_THRU_ALL_UIS macro defined below.  */
 128 extern void switch_thru_all_uis_init (struct switch_thru_all_uis *state);
 129 extern int switch_thru_all_uis_cond (struct switch_thru_all_uis *state);
 130 extern void switch_thru_all_uis_next (struct switch_thru_all_uis *state);
 131
 132   /* Traverse through all UI, and switch the current UI to the one
 133      being iterated.  */
 134 #define SWITCH_THRU_ALL_UIS(STATE)              \
 135   for (switch_thru_all_uis_init (&STATE);               \
 136        switch_thru_all_uis_cond (&STATE);               \
 137        switch_thru_all_uis_next (&STATE))
 138
 139 /* From top.c.  */
 140 extern char *saved_command_line;
 141 extern int in_user_command;
 142 extern int confirm;
 143 extern char gdb_dirbuf[1024];
 144 extern int inhibit_gdbinit;
 145 extern const char gdbinit[];
 146
 147 extern void print_gdb_version (struct ui_file *);
 148 extern void print_gdb_configuration (struct ui_file *);
 149
 150 extern void read_command_file (FILE *);
 151 extern void init_history (void);
 152 extern void command_loop (void);
 153 extern int quit_confirm (void);
 154 extern void quit_force (char *, int);
 155 extern void quit_command (char *, int);
 156 extern void quit_cover (void);
 157 extern void execute_command (char *, int);
 158
 159 /* If the interpreter is in sync mode (we're running a user command's
 160    list, running command hooks or similars), and we just ran a
 161    synchronous command that started the target, wait for that command
 162    to end.  WAS_SYNC indicates whether sync_execution was set before
 163    the command was run.  */
 164
 165 extern void maybe_wait_sync_command_done (int was_sync);
 166
 167 /* Wait for a synchronous execution command to end.  */
 168 extern void wait_sync_command_done (void);
 169
 170 extern void check_frame_language_change (void);
 171
 172 /* Prepare for execution of a command.
 173    Call this before every command, CLI or MI.
 174    Returns a cleanup to be run after the command is completed.  */
 175 extern struct cleanup *prepare_execute_command (void);
 176
 177 /* This function returns a pointer to the string that is used
 178    by gdb for its command prompt.  */
 179 extern char *get_prompt (void);
 180
 181 /* This function returns a pointer to the string that is used
 182    by gdb for its command prompt.  */
 183 extern void set_prompt (const char *s);
 184
 185 /* Return 1 if the current input handler is a secondary prompt, 0 otherwise.  */
 186
 187 extern int gdb_in_secondary_prompt_p (void);
 188
 189 /* From random places.  */
 190 extern int readnow_symbol_files;
 191
 192 /* Perform _initialize initialization.  */
 193 extern void gdb_init (char *);
 194
 195 /* For use by event-top.c.  */
 196 /* Variables from top.c.  */
 197 extern int source_line_number;
 198 extern const char *source_file_name;
 199 extern int history_expansion_p;
 200 extern int server_command;
 201 extern char *lim_at_start;
 202
 203 extern void gdb_add_history (const char *);
 204
 205 extern void show_commands (char *args, int from_tty);
 206
 207 extern void set_history (char *, int);
 208
 209 extern void show_history (char *, int);
 210
 211 extern void set_verbose (char *, int, struct cmd_list_element *);
 212
 213 extern void do_restore_instream_cleanup (void *stream);
 214
 215 extern char *handle_line_of_input (struct buffer *cmd_line_buffer,
 216                                    char *rl, int repeat,
 217                                    char *annotation_suffix);
 218
 219 #endif