| 1 | /* Definitions used by event-top.c, for GDB, the GNU debugger. |
| 2 | |
| 3 | Copyright (C) 1999, 2001, 2003, 2007, 2008 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 3 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, see <http://www.gnu.org/licenses/>. */ |
| 21 | |
| 22 | #ifndef EVENT_TOP_H |
| 23 | #define EVENT_TOP_H |
| 24 | |
| 25 | struct cmd_list_element; |
| 26 | |
| 27 | /* Stack for prompts. Each prompt is composed as a prefix, a prompt |
| 28 | and a suffix. The prompt to be displayed at any given time is the |
| 29 | one on top of the stack. A stack is necessary because of cases in |
| 30 | which the execution of a gdb command requires further input from |
| 31 | the user, like for instance 'commands' for breakpoints and |
| 32 | 'actions' for tracepoints. In these cases, the prompt is '>' and |
| 33 | gdb should process input using the asynchronous readline interface |
| 34 | and the event loop. In order to achieve this, we need to save |
| 35 | somewhere the state of GDB, i.e. that it is processing user input |
| 36 | as part of a command and not as part of the top level command loop. |
| 37 | The prompt stack represents part of the saved state. Another part |
| 38 | would be the function that readline would invoke after a whole line |
| 39 | of input has ben entered. This second piece would be something |
| 40 | like, for instance, where to return within the code for the actions |
| 41 | commands after a line has been read. This latter portion has not |
| 42 | beeen implemented yet. The need for a 3-part prompt arises from |
| 43 | the annotation level. When this is set to 2, the prompt is |
| 44 | actually composed of a prefix, the prompt itself and a suffix. */ |
| 45 | |
| 46 | /* At any particular time there will be always at least one prompt on |
| 47 | the stack, the one being currently displayed by gdb. If gdb is |
| 48 | using annotation level equal 2, there will be 2 prompts on the |
| 49 | stack: the usual one, w/o prefix and suffix (at top - 1), and the |
| 50 | 'composite' one with prefix and suffix added (at top). At this |
| 51 | time, this is the only use of the prompt stack. Resetting annotate |
| 52 | to 0 or 1, pops the top of the stack, resetting its size to one |
| 53 | element. The MAXPROMPTS limit is safe, for now. Once other cases |
| 54 | are dealt with (like the different prompts used for 'commands' or |
| 55 | 'actions') this array implementation of the prompt stack may have |
| 56 | to change. */ |
| 57 | |
| 58 | #define MAXPROMPTS 10 |
| 59 | struct prompts |
| 60 | { |
| 61 | struct |
| 62 | { |
| 63 | char *prefix; |
| 64 | char *prompt; |
| 65 | char *suffix; |
| 66 | } |
| 67 | prompt_stack[MAXPROMPTS]; |
| 68 | int top; |
| 69 | }; |
| 70 | |
| 71 | #define PROMPT(X) the_prompts.prompt_stack[the_prompts.top + X].prompt |
| 72 | #define PREFIX(X) the_prompts.prompt_stack[the_prompts.top + X].prefix |
| 73 | #define SUFFIX(X) the_prompts.prompt_stack[the_prompts.top + X].suffix |
| 74 | |
| 75 | /* Exported functions from event-top.c. |
| 76 | FIXME: these should really go into top.h. */ |
| 77 | |
| 78 | extern void display_gdb_prompt (char *new_prompt); |
| 79 | void gdb_setup_readline (void); |
| 80 | void gdb_disable_readline (void); |
| 81 | extern void async_init_signals (void); |
| 82 | extern void set_async_editing_command (char *args, int from_tty, |
| 83 | struct cmd_list_element *c); |
| 84 | extern void set_async_annotation_level (char *args, int from_tty, |
| 85 | struct cmd_list_element *c); |
| 86 | extern void set_async_prompt (char *args, int from_tty, |
| 87 | struct cmd_list_element *c); |
| 88 | |
| 89 | /* Signal to catch ^Z typed while reading a command: SIGTSTP or SIGCONT. */ |
| 90 | #ifndef STOP_SIGNAL |
| 91 | #include <signal.h> |
| 92 | #ifdef SIGTSTP |
| 93 | #define STOP_SIGNAL SIGTSTP |
| 94 | extern void handle_stop_sig (int sig); |
| 95 | #endif |
| 96 | #endif |
| 97 | extern void handle_sigint (int sig); |
| 98 | extern void handle_sigterm (int sig); |
| 99 | extern void pop_prompt (void); |
| 100 | extern void push_prompt (char *prefix, char *prompt, char *suffix); |
| 101 | extern void gdb_readline2 (void *client_data); |
| 102 | extern void mark_async_signal_handler_wrapper (void *token); |
| 103 | extern void async_request_quit (void *arg); |
| 104 | extern void stdin_event_handler (int error, void *client_data); |
| 105 | extern void async_disable_stdin (void); |
| 106 | extern void async_enable_stdin (void); |
| 107 | |
| 108 | /* Exported variables from event-top.c. |
| 109 | FIXME: these should really go into top.h. */ |
| 110 | |
| 111 | extern int async_command_editing_p; |
| 112 | extern int exec_done_display_p; |
| 113 | extern char *async_annotation_suffix; |
| 114 | extern char *new_async_prompt; |
| 115 | extern struct prompts the_prompts; |
| 116 | extern void (*call_readline) (void *); |
| 117 | extern void (*input_handler) (char *); |
| 118 | extern int input_fd; |
| 119 | extern void (*after_char_processing_hook) (void); |
| 120 | |
| 121 | extern void cli_command_loop (void); |
| 122 | |
| 123 | #endif |