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920d2a4419
Add show_VARIABLE functions, update add_setshow call. * varobj.c (_initialize_varobj, show_varobjdebug): Add and update. * valprint.c (_initialize_valprint, show_print_max) (show_stop_print_at_null, show_repeat_count_threshold) (show_prettyprint_structs, show_unionprint) (show_prettyprint_arrays, show_addressprint, show_input_radix) (show_output_radix): Ditto. * valops.c (_initialize_valops, show_overload_resolution): Ditto. * utils.c (initialize_utils, show_chars_per_line) (show_lines_per_page, show_demangle, show_pagination_enabled) (show_sevenbit_strings, show_asm_demangle): Ditto * tui/tui-win.c (_initialize_tui_win, show_tui_border_kind) (show_tui_border_mode, show_tui_active_border_mode): Ditto. * top.c (init_main, show_new_async_prompt) (show_async_command_editing_p, show_write_history_p) (show_history_size, show_history_filename, show_caution) (show_annotation_level, init_main): Ditto. * target.c (initialize_targets, show_targetdebug) (show_trust_readonly): Ditto. * symfile.c (_initialize_symfile, show_symbol_reloading) (show_ext_args, show_download_write_size) (show_debug_file_directory): Ditto. * source.c (_initialize_source, show_lines_to_list): Ditto. * solib.c (_initialize_solib, show_auto_solib_add) (show_solib_search_path): Ditto. * p-valprint.c (_initialize_pascal_valprint) (show_pascal_static_field_print): Ditto. * printcmd.c (_initialize_printcmd, show_max_symbolic_offset) (show_print_symbol_filename): Add and update. * parse.c (_initialize_parse, show_expressiondebug): Dito. * observer.c (_initialize_observer, show_observer_debug): Dito. * maint.c (_initialize_maint_cmds, show_watchdog) (show_maintenance_profile_p): Dito. * linux-nat.c (_initialize_linux_nat, show_debug_linux_nat): Dito. * infrun.c (_initialize_infrun, show_debug_infrun) (show_stop_on_solib_events, show_follow_fork_mode_string) (show_scheduler_mode, show_step_stop_if_no_debug): Ditto. * infcall.c (_initialize_infcall, show_coerce_float_to_double_p) (show_unwind_on_signal_p): Ditto. * gdbtypes.c (build_gdbtypes, show_opaque_type_resolution) (_initialize_gdbtypes, show_overload_debug): Ditto. * gdb-events.c, gdb-events.sh (_initialize_gdb_events) (show_gdb_events_debug): Ditto. * gdbarch.c, gdbarch.sh (show_gdbarch_debug) (_initialize_gdbarch): Ditto. * frame.c (_initialize_frame, show_backtrace_past_main) (show_backtrace_past_entry, show_backtrace_limit) (show_frame_debug): Ditto. * exec.c (_initialize_exec, show_write_files): Ditto. * dwarf2read.c (_initialize_dwarf2_read) (show_dwarf2_max_cache_age): Ditto. * demangle.c (_initialize_demangler) (show_demangling_style_names): Ditto. * dcache.c (_initialize_dcache, show_dcache_enabled_p): Ditto. * cp-valprint.c (show_static_field_print) (_initialize_cp_valprint, show_vtblprint, show_objectprint): Ditto. * corefile.c (_initialize_core, show_gnutarget_string): Ditto. * cli/cli-logging.c (_initialize_cli_logging) (show_logging_overwrite, show_logging_redirect) (show_logging_filename): Ditto. * cli/cli-cmds.c (show_info_verbose, show_history_expansion_p) (init_cli_cmds, show_baud_rate, show_remote_debug) (show_remote_timeout, show_max_user_call_depth): Ditto. * charset.c (show_host_charset_name, show_target_charset_name) (initialize_charset): Ditto. * breakpoint.c (show_can_use_hw_watchpoints) (show_pending_break_support, _initialize_breakpoint): Ditto.
219 lines
6.7 KiB
C
219 lines
6.7 KiB
C
/* GDB Notifications to Observers.
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Copyright 2003, 2004 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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/* An observer is an entity who is interested in being notified when GDB
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reaches certain states, or certain events occur in GDB. The entity being
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observed is called the Subject. To receive notifications, the observer
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attaches a callback to the subject. One subject can have several
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observers.
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This file implements an internal generic low-level event notification
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mechanism based on the Observer paradigm described in the book "Design
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Patterns". This generic event notification mechansim is then re-used
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to implement the exported high-level notification management routines
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for all possible notifications.
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The current implementation of the generic observer provides support
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for contextual data. This contextual data is given to the subject
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when attaching the callback. In return, the subject will provide
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this contextual data back to the observer as a parameter of the
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callback.
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FIXME: The current support for the contextual data is only partial,
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as it lacks a mechanism that would deallocate this data when the
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callback is detached. This is not a problem so far, as this contextual
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data is only used internally to hold a function pointer. Later on,
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if a certain observer needs to provide support for user-level
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contextual data, then the generic notification mechanism will need
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need to be enhanced to allow the observer to provide a routine to
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deallocate the data when attaching the callback.
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This file is currently maintained by hand, but the long term plan
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if the number of different notifications starts growing is to create
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a new script (observer.sh) that would generate this file, and the
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associated documentation. */
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#include "defs.h"
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#include "observer.h"
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#include "command.h"
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#include "gdbcmd.h"
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static int observer_debug;
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static void
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show_observer_debug (struct ui_file *file, int from_tty,
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struct cmd_list_element *c, const char *value)
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{
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fprintf_filtered (file, _("Observer debugging is %s.\n"), value);
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}
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/* The internal generic observer. */
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typedef void (generic_observer_notification_ftype) (const void *data,
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const void *args);
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struct observer
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{
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generic_observer_notification_ftype *notify;
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/* No memory management needed for the following field for now. */
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void *data;
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};
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/* A list of observers, maintained by the subject. A subject is
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actually represented by its list of observers. */
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struct observer_list
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{
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struct observer_list *next;
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struct observer *observer;
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};
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/* Allocate a struct observer_list, intended to be used as a node
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in the list of observers maintained by a subject. */
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static struct observer_list *
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xalloc_observer_list_node (void)
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{
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struct observer_list *node = XMALLOC (struct observer_list);
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node->observer = XMALLOC (struct observer);
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return node;
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}
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/* The opposite of xalloc_observer_list_node, frees the memory for
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the given node. */
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static void
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xfree_observer_list_node (struct observer_list *node)
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{
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xfree (node->observer);
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xfree (node);
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}
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/* Attach the callback NOTIFY to a SUBJECT. The DATA is also stored,
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in order for the subject to provide it back to the observer during
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a notification. */
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static struct observer *
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generic_observer_attach (struct observer_list **subject,
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generic_observer_notification_ftype * notify,
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void *data)
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{
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struct observer_list *observer_list = xalloc_observer_list_node ();
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observer_list->next = *subject;
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observer_list->observer->notify = notify;
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observer_list->observer->data = data;
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*subject = observer_list;
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return observer_list->observer;
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}
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/* Remove the given OBSERVER from the SUBJECT. Once detached, OBSERVER
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should no longer be used, as it is no longer valid. */
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static void
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generic_observer_detach (struct observer_list **subject,
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const struct observer *observer)
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{
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struct observer_list *previous_node = NULL;
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struct observer_list *current_node = *subject;
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while (current_node != NULL)
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{
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if (current_node->observer == observer)
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{
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if (previous_node != NULL)
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previous_node->next = current_node->next;
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else
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*subject = current_node->next;
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xfree_observer_list_node (current_node);
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return;
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}
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previous_node = current_node;
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current_node = current_node->next;
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}
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/* We should never reach this point. However, this should not be
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a very serious error, so simply report a warning to the user. */
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warning (_("Failed to detach observer"));
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}
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/* Send a notification to all the observers of SUBJECT. ARGS is passed to
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all observers as an argument to the notification callback. */
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static void
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generic_observer_notify (struct observer_list *subject, const void *args)
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{
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struct observer_list *current_node = subject;
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while (current_node != NULL)
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{
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(*current_node->observer->notify) (current_node->observer->data, args);
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current_node = current_node->next;
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}
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}
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/* The following code is only used to unit-test the observers from our
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testsuite. DO NOT USE IT within observer.c (or anywhere else for
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that matter)! */
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/* If we define these variables and functions as `static', the
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compiler will optimize them out. */
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int observer_test_first_observer = 0;
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int observer_test_second_observer = 0;
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int observer_test_third_observer = 0;
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void
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observer_test_first_notification_function (struct bpstats *bs)
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{
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observer_test_first_observer++;
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}
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void
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observer_test_second_notification_function (struct bpstats *bs)
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{
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observer_test_second_observer++;
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}
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void
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observer_test_third_notification_function (struct bpstats *bs)
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{
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observer_test_third_observer++;
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}
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extern initialize_file_ftype _initialize_observer; /* -Wmissing-prototypes */
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void
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_initialize_observer (void)
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{
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add_setshow_zinteger_cmd ("observer", class_maintenance,
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&observer_debug, _("\
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Set observer debugging."), _("\
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Show observer debugging."), _("\
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When non-zero, observer debugging is enabled."),
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NULL,
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show_observer_debug,
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&setdebuglist, &showdebuglist);
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}
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#include "observer.inc"
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