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binutils-gdb/gdb/top.h
Pedro Alves 73ab01a07d Make the intepreters output to all UIs 
When we have multiple consoles, MI channels, etc., then we need to
broadcast breakpoint hits, etc. to all UIs.  In the past, I've
adjusted most of the run control to communicate events to the
interpreters through observer notifications, so events would be
properly sent to console and MI streams, in sync and async modes.

This patch does the next logical step -- have each interpreter's
observers output interpreter-specific info to _all_ UIs.

Note that when we have multiple instances of active cli/tui
interpreters, then the cli_interp and tui_interp globals no longer
work.  This is addressed by this patch.

Also, the interpreters currently register some observers when resumed
and remove them when suspended.  If we have multiple instances of the
interpreters, and they can be suspended/resumed at different,
independent times, that no longer works.  What we instead do is always
install the observers, and then have the observers themselves know
when to do nothing.

An earlier prototype of this series did the looping over struct UIs in
common code, and then dispatched events to the interpreters through a
matching interp_on_foo method for each observer.  That turned out a
lot more complicated than the present solution, as we'd end up with
having to create a new interp method every time some interpreter
wanted to listen to some observer notification, resulting in a lot of
duplicated make-work and more coupling than desirable.

gdb/ChangeLog:
2016-06-21  Pedro Alves  <palves@redhat.com>

	* cli/cli-interp.c (cli_interp): Delete.
	(as_cli_interp): New function.
	(cli_on_normal_stop, cli_on_signal_received)
	(cli_on_end_stepping_range, cli_on_signal_exited, cli_on_exited)
	(cli_on_no_history): Send output to all CLI UIs.
	(cli_on_sync_execution_done, cli_on_command_error): Skip output if
	the top level interpreter is not a CLI.
	(cli_interpreter_init): Don't set cli_interp or install observers
	here.
	(_initialize_cli_interp): Install observers here.
	* event-top.c (main_ui_, ui_list): New globals.
	(current_ui): Point to main_ui_.
	(restore_ui_cleanup, switch_thru_all_uis_init)
	(switch_thru_all_uis_cond, switch_thru_all_uis_next): New
	functions.
	* mi/mi-interp.c (as_mi_interp): New function.
	(mi_interpreter_init): Don't install observers here.
	(mi_on_sync_execution_done): Skip output if the top level
	interpreter is not a MI.
	(mi_new_thread, mi_thread_exit, mi_record_changed)
	(mi_inferior_added, mi_inferior_appeared, mi_inferior_exit)
	(mi_inferior_removed): Send output to all MI UIs.
	(find_mi_interpreter, mi_interp_data): Delete.
	(find_mi_interp): New function.
	(mi_on_signal_received, mi_on_end_stepping_range)
	(mi_on_signal_exited, mi_on_exited, mi_on_no_history): Send output
	to all MI UIs.
	(mi_on_normal_stop): Rename to ...
	(mi_on_normal_stop_1): ... this.
	(mi_on_normal_stop): Reimplement, sending output to all MI UIs.
	(mi_traceframe_changed, mi_tsv_created, mi_tsv_deleted)
	(mi_tsv_modified, mi_breakpoint_created, mi_breakpoint_deleted)
	(mi_breakpoint_modified, mi_output_running_pid): Send output to
	all MI UIs.
	(mi_on_resume): Rename to ...
	(mi_on_resume_1): ... this.  Don't handle infcalls here.
	(mi_on_resume): Reimplement, sending output to all MI UIs.
	(mi_solib_loaded, mi_solib_unloaded, mi_command_param_changed)
	(mi_memory_changed): Send output to all MI UIs.
	(report_initial_inferior): Install observers here.
	* top.h (struct ui) <next>: New field.
	(ui_list): Declare.
	(struct switch_thru_all_uis): New.
	(switch_thru_all_uis_init, switch_thru_all_uis_cond)
	(switch_thru_all_uis_next): Declare.
	(SWITCH_THRU_ALL_UIS): New macro.
	* tui/tui-interp.c (tui_interp): Delete global.
	(as_tui_interp): New function.
	(tui_on_normal_stop, tui_on_signal_received)
	(tui_on_end_stepping_range, tui_on_signal_exited, tui_on_exited)
	(tui_on_no_history): Send output to all TUI UIs.
	(tui_on_sync_execution_done, tui_on_command_error): Skip output if
	the top level interpreter is not a TUI.
	(tui_init): Don't set tui_interp or install observers here.
	(_initialize_tui_interp): Install observers here.
2016-06-21 01:11:45 +01:00

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/* Top level stuff for GDB, the GNU debugger.
Copyright (C) 1986-2016 Free Software Foundation, Inc.
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 3 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, see <http://www.gnu.org/licenses/>. */
#ifndef TOP_H
#define TOP_H
#include "buffer.h"
#include "event-loop.h"
struct tl_interp_info;
/* All about a user interface instance. Each user interface has its
own I/O files/streams, readline state, its own top level
interpreter (for the main UI, this is the interpreter specified
with -i on the command line) and secondary interpreters (for
interpreter-exec ...), etc. There's always one UI associated with
stdin/stdout/stderr, but the user can create secondary UIs, for
example, to create a separate MI channel on its own stdio
streams. */
struct ui
{
/* Pointer to next in singly-linked list. */
struct ui *next;
/* The UI's command line buffer. This is to used to accumulate
input until we have a whole command line. */
struct buffer line_buffer;
/* The callback used by the event loop whenever an event is detected
on the UI's input file descriptor. This function incrementally
builds a buffer where it accumulates the line read up to the
point of invocation. In the special case in which the character
read is newline, the function invokes the INPUT_HANDLER callback
(see below). */
void (*call_readline) (gdb_client_data);
/* The function to invoke when a complete line of input is ready for
processing. */
void (*input_handler) (char *);
/* Each UI has its own independent set of interpreters. */
struct ui_interp_info *interp_info;
/* True if the UI is in async mode, false if in sync mode. If in
sync mode, a synchronous execution command (e.g, "next") does not
return until the command is finished. If in async mode, then
running a synchronous command returns right after resuming the
target. Waiting for the command's completion is later done on
the top event loop. For the main UI, this starts out disabled,
until all the explicit command line arguments (e.g., `gdb -ex
"start" -ex "next"') are processed. */
int async;
/* The fields below that start with "m_" are "private". They're
meant to be accessed through wrapper macros that make them look
like globals. */
/* The ui_file streams. */
/* Normal results */
struct ui_file *m_gdb_stdout;
/* Input stream */
struct ui_file *m_gdb_stdin;
/* Serious error notifications */
struct ui_file *m_gdb_stderr;
/* Log/debug/trace messages that should bypass normal stdout/stderr
filtering. For moment, always call this stream using
*_unfiltered. In the very near future that restriction shall be
removed - either call shall be unfiltered. (cagney 1999-06-13). */
struct ui_file *m_gdb_stdlog;
};
/* The current UI. */
extern struct ui *current_ui;
/* The list of all UIs. */
extern struct ui *ui_list;
/* State for SWITCH_THRU_ALL_UIS. Declared here because it is meant
to be created on the stack, but should be treated as opaque. */
struct switch_thru_all_uis
{
struct ui *iter;
struct cleanup *old_chain;
};
/* Functions to drive SWITCH_THRU_ALL_UIS. Though declared here by
necessity, these functions should not be used other than via the
SWITCH_THRU_ALL_UIS macro defined below. */
extern void switch_thru_all_uis_init (struct switch_thru_all_uis *state);
extern int switch_thru_all_uis_cond (struct switch_thru_all_uis *state);
extern void switch_thru_all_uis_next (struct switch_thru_all_uis *state);
/* Traverse through all UI, and switch the current UI to the one
being iterated. */
#define SWITCH_THRU_ALL_UIS(STATE) \
for (switch_thru_all_uis_init (&STATE); \
switch_thru_all_uis_cond (&STATE); \
switch_thru_all_uis_next (&STATE))
/* From top.c. */
extern char *saved_command_line;
extern FILE *instream;
extern int in_user_command;
extern int confirm;
extern char gdb_dirbuf[1024];
extern int inhibit_gdbinit;
extern const char gdbinit[];
extern void print_gdb_version (struct ui_file *);
extern void print_gdb_configuration (struct ui_file *);
extern void read_command_file (FILE *);
extern void init_history (void);
extern void command_loop (void);
extern int quit_confirm (void);
extern void quit_force (char *, int);
extern void quit_command (char *, int);
extern void quit_cover (void);
extern void execute_command (char *, int);
/* If the interpreter is in sync mode (we're running a user command's
list, running command hooks or similars), and we just ran a
synchronous command that started the target, wait for that command
to end. WAS_SYNC indicates whether sync_execution was set before
the command was run. */
extern void maybe_wait_sync_command_done (int was_sync);
/* Wait for a synchronous execution command to end. */
extern void wait_sync_command_done (void);
extern void check_frame_language_change (void);
/* Prepare for execution of a command.
Call this before every command, CLI or MI.
Returns a cleanup to be run after the command is completed. */
extern struct cleanup *prepare_execute_command (void);
/* This function returns a pointer to the string that is used
by gdb for its command prompt. */
extern char *get_prompt (void);
/* This function returns a pointer to the string that is used
by gdb for its command prompt. */
extern void set_prompt (const char *s);
/* Return 1 if the current input handler is a secondary prompt, 0 otherwise. */
extern int gdb_in_secondary_prompt_p (void);
/* From random places. */
extern int readnow_symbol_files;
/* Perform _initialize initialization. */
extern void gdb_init (char *);
/* For use by event-top.c. */
/* Variables from top.c. */
extern int source_line_number;
extern const char *source_file_name;
extern int history_expansion_p;
extern int server_command;
extern char *lim_at_start;
extern void gdb_add_history (const char *);
extern void show_commands (char *args, int from_tty);
extern void set_history (char *, int);
extern void show_history (char *, int);
extern void set_verbose (char *, int, struct cmd_list_element *);
extern void do_restore_instream_cleanup (void *stream);
extern char *handle_line_of_input (struct buffer *cmd_line_buffer,
char *rl, int repeat,
char *annotation_suffix);
#endif
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