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authorJason Molenda <jmolenda@apple.com>1999-09-22 03:28:34 +0000
committerJason Molenda <jmolenda@apple.com>1999-09-22 03:28:34 +0000
commitc2c6d25f0d5eea4f834420870021a8c52db24018 (patch)
treef4b3d5e9e3207fa8118db4085f9c6a0cbc2bdaf6 /gdb/event-top.h
parent54af6ff67571ba569b94e26d558d02f9955e6844 (diff)
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import gdb-1999-09-21
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+/* Definitions used by GDB event-top.c.
+ Copyright 1999 Free Software Foundation, Inc.
+ Written by Elena Zannoni <ezannoni@cygnus.com> of Cygnus Solutions.
+
+ This file is part of GDB.
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 59 Temple Place - Suite 330,
+ Boston, MA 02111-1307, USA. */
+
+/* Stack for prompts. Each prompt is composed as a prefix, a prompt
+ and a suffix. The prompt to be displayed at any given time is the
+ one on top of the stack. A stack is necessary because of cases in
+ which the execution of a gdb command requires further input from
+ the user, like for instance 'commands' for breakpoints and
+ 'actions' for tracepoints. In these cases, the prompt is '>' and
+ gdb should process input using the asynchronous readline interface
+ and the event loop. In order to achieve this, we need to save
+ somewhere the state of GDB, i.e. that it is processing user input
+ as part of a command and not as part of the top level command loop.
+ The prompt stack represents part of the saved state. Another part
+ would be the function that readline would invoke after a whole line
+ of input has ben entered. This second piece would be something
+ like, for instance, where to return within the code for the actions
+ commands after a line has been read. This latter portion has not
+ beeen implemented yet. The need for a 3-part prompt arises from
+ the annotation level. When this is set to 2, the prompt is actually
+ composed of a prefix, the prompt itself and a suffix. */
+
+/* At any particular time there will be always at least one prompt on
+ the stack, the one being currently displayed by gdb. If gdb is
+ using annotation level equal 2, there will be 2 prompts on the
+ stack: the usual one, w/o prefix and suffix (at top - 1), and the
+ 'composite' one with prefix and suffix added (at top). At this
+ time, this is the only use of the prompt stack. Resetting annotate
+ to 0 or 1, pops the top of the stack, resetting its size to one
+ element. The MAXPROMPTS limit is safe, for now. Once other cases
+ are dealt with (like the different prompts used for 'commands' or
+ 'actions') this array implementation of the prompt stack may have
+ to change. */
+
+#define MAXPROMPTS 10
+struct prompts
+ {
+ struct
+ {
+ char *prefix;
+ char *prompt;
+ char *suffix;
+ }
+ prompt_stack[MAXPROMPTS];
+ int top;
+ };
+
+#define PROMPT(X) the_prompts.prompt_stack[the_prompts.top + X].prompt
+#define PREFIX(X) the_prompts.prompt_stack[the_prompts.top + X].prefix
+#define SUFFIX(X) the_prompts.prompt_stack[the_prompts.top + X].suffix
+
+/* Exported functions from event-top.c.
+ FIXME: these should really go into top.h. */
+
+extern void display_gdb_prompt (char *new_prompt);
+extern void async_init_signals (void);
+extern void set_async_editing_command (char *args, int from_tty, struct cmd_list_element *c);
+extern void set_async_annotation_level (char *args, int from_tty, struct cmd_list_element *c);
+extern void set_async_prompt (char *args, int from_tty, struct cmd_list_element *c);
+
+/* Signal to catch ^Z typed while reading a command: SIGTSTP or SIGCONT. */
+#ifndef STOP_SIGNAL
+#ifdef SIGTSTP
+#define STOP_SIGNAL SIGTSTP
+extern void handle_stop_sig (int sig);
+#endif
+#endif
+extern void handle_sigint (int sig);
+extern void pop_prompt (void);
+extern void push_prompt (char *prefix, char *prompt, char *suffix);
+extern void gdb_readline2 (gdb_client_data client_data);
+extern void mark_async_signal_handler_wrapper (PTR token);
+extern void async_request_quit (gdb_client_data arg);
+extern void stdin_event_handler (int error, int fd, gdb_client_data client_data);
+
+/* Exported variables from event-top.c.
+ FIXME: these should really go into top.h. */
+
+extern int async_command_editing_p;
+extern int exec_done_display_p;
+extern char *async_annotation_suffix;
+extern char *new_async_prompt;
+extern struct prompts the_prompts;
+extern void (*call_readline) (gdb_client_data);
+extern void (*input_handler) (char *);
+extern int input_fd;