Replace TUI's select_frame hook (PR tui/13378)
The select_frame hook is used by TUI to update TUI's frame and register information following changes to the selected frame. The problem with this hook is that it gets called after every single frame change, even if the frame change is only temporary or internal. This is the primary cause of flickering and slowdown when running the inferior under TUI with conditional breakpoints set. Internal GDB events are the source of many calls to select_frame and these internal events are triggered frequently, especially when a few conditional breakpoints are set. This patch removes the select_frame hook altogether and instead makes the frame and register information get updated in two key places (using observers): after an inferior stops, and right before displaying a prompt. The latter hook covers the case when frame information must be updated following a call to "up", "down" or "frame", and the former covers the case when frame and register information must be updated after a call to "continue", "step", etc. or after the inferior stops in async execution mode. Together these hooks should cover all the cases when frame information ought to be refreshed (and when the relevant windows ought to be subsequently updated). The print_frame_info_listing hook is also effectively obsolete now, but it still must be set while the TUI is active because its caller print_frame_info will otherwise assume that the CLI is active, and will print the frame informaion accordingly. So this patch also sets the print_frame_info_listing hook to a dummy callback, in lieu of outright removing it yet. Effectively, with this patch, frame/PC changes that do not immediately precede an inferior-stop event or a prompt display event no longer cause TUI's frame and register information to be updated. And as a result of this change and of the previous change to tui_show_frame_info, the TUI is much more disciplined about updating the screen, and so the flicker as described in the PR is totally gone. gdb/ChangeLog: PR tui/13378 * frame.c (select_frame): Remove reference to deprecated_selected_frame_level_changed_hook. * frame.h (deprecated_selected_frame_level_changed_hook): Remove declaration. * stack.c (deprecated_selected_frame_level_changed_hook): Likewise. * tui/tui-hooks.c (tui_selected_frame_level_changed_hook): Rename to ... (tui_refresh_frame_and_register_information): ... this. Bail out if there is no stack. Don't update register information unless registers_too_p is true. (tui_print_frame_info_listing_hook): Rename to ... (tui_dummy_print_frame_info_listing_hook): ... this. (tui_before_prompt): New function. (tui_normal_stop): New function. (tui_before_prompt_observer): New observer. (tui_normal_stop_observer): New observer. (tui_install_hooks): Set deprecated_print_frame_info_listing_hook to tui_dummy_print_frame_info_listing_hook. Register tui_before_prompt_observer to call tui_before_prompt and tui_normal_stop_observer to call tui_normal_stop. Remove reference to deprecated_selected_frame_level_changed_hook. (tui_remove_hooks): Detach and unset tui_before_prompt_observer and tui_normal_stop_observer. Remove reference to deprecated_selected_frame_level_changed_hook.
This commit is contained in:
Patrick Palka
parent
b5fca6d728
commit
0986c744df
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@ -1,3 +1,33 @@
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2015-06-30 Patrick Palka <patrick@parcs.ath.cx>
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PR tui/13378
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* frame.c (select_frame): Remove reference to
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deprecated_selected_frame_level_changed_hook.
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* frame.h (deprecated_selected_frame_level_changed_hook): Remove
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declaration.
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* stack.c (deprecated_selected_frame_level_changed_hook):
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Likewise.
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* tui/tui-hooks.c (tui_selected_frame_level_changed_hook):
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Rename to ...
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(tui_refresh_frame_and_register_information): ... this. Bail
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out if there is no stack. Don't update register information
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unless registers_too_p is true.
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(tui_print_frame_info_listing_hook): Rename to ...
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(tui_dummy_print_frame_info_listing_hook): ... this.
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(tui_before_prompt): New function.
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(tui_normal_stop): New function.
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(tui_before_prompt_observer): New observer.
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(tui_normal_stop_observer): New observer.
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(tui_install_hooks): Set
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deprecated_print_frame_info_listing_hook to
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tui_dummy_print_frame_info_listing_hook. Register
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tui_before_prompt_observer to call tui_before_prompt and
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tui_normal_stop_observer to call tui_normal_stop. Remove
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reference to deprecated_selected_frame_level_changed_hook.
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(tui_remove_hooks): Detach and unset tui_before_prompt_observer
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and tui_normal_stop_observer. Remove reference to
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deprecated_selected_frame_level_changed_hook.
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2015-06-30 Patrick Palka <patrick@parcs.ath.cx>
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PR tui/13378
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@ -1576,8 +1576,6 @@ select_frame (struct frame_info *fi)
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selected_frame = fi;
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/* NOTE: cagney/2002-05-04: FI can be NULL. This occurs when the
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frame is being invalidated. */
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if (deprecated_selected_frame_level_changed_hook)
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deprecated_selected_frame_level_changed_hook (frame_relative_level (fi));
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/* FIXME: kseitz/2002-08-28: It would be nice to call
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selected_frame_level_changed_event() right here, but due to limitations
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@ -763,8 +763,6 @@ extern void args_info (char *, int);
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extern void locals_info (char *, int);
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extern void (*deprecated_selected_frame_level_changed_hook) (int);
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extern void return_command (char *, int);
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/* Set FRAME's unwinder temporarily, so that we can call a sniffer.
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@ -52,8 +52,6 @@
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#include "symfile.h"
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#include "extension.h"
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void (*deprecated_selected_frame_level_changed_hook) (int);
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/* The possible choices of "set print frame-arguments", and the value
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of this setting. */
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@ -119,18 +119,19 @@ tui_about_to_proceed (void)
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tui_target_has_run = 1;
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}
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/* The selected frame has changed. This is happens after a target
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stop or when the user explicitly changes the frame
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(up/down/thread/...). */
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/* Refresh TUI's frame and register information. This is a hook intended to be
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used to update the screen after potential frame and register changes.
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REGISTERS_TOO_P controls whether to refresh our register information. */
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static void
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tui_selected_frame_level_changed_hook (int level)
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tui_refresh_frame_and_register_information (int registers_too_p)
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{
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struct frame_info *fi;
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CORE_ADDR pc;
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struct cleanup *old_chain;
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/* Negative level means that the selected frame was cleared. */
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if (level < 0)
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if (!has_stack_frames ())
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return;
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old_chain = make_cleanup_restore_target_terminal ();
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@ -158,7 +159,7 @@ tui_selected_frame_level_changed_hook (int level)
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tui_show_frame_info (fi);
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/* Refresh the register window if it's visible. */
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if (tui_is_window_visible (DATA_WIN))
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if (tui_is_window_visible (DATA_WIN) && registers_too_p)
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{
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tui_refreshing_registers = 1;
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tui_check_data_values (fi);
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@ -168,15 +169,15 @@ tui_selected_frame_level_changed_hook (int level)
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do_cleanups (old_chain);
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}
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/* Called from print_frame_info to list the line we stopped in. */
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/* Dummy callback for deprecated_print_frame_info_listing_hook which is called
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from print_frame_info. */
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static void
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tui_print_frame_info_listing_hook (struct symtab *s,
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int line,
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int stopline,
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int noerror)
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tui_dummy_print_frame_info_listing_hook (struct symtab *s,
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int line,
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int stopline,
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int noerror)
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{
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select_source_symtab (s);
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tui_show_frame_info (get_selected_frame (NULL));
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}
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/* Perform all necessary cleanups regarding our module's inferior data
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@ -191,21 +192,47 @@ tui_inferior_exit (struct inferior *inf)
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tui_display_main ();
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}
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/* Observer for the before_prompt notification. */
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static void
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tui_before_prompt (const char *current_gdb_prompt)
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{
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/* This refresh is intended to catch changes to the selected frame following
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a call to "up", "down" or "frame". As such we don't necessarily want to
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refresh registers here as they could not have changed. Registers will be
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refreshed after a normal stop or by our tui_register_changed_hook. */
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tui_refresh_frame_and_register_information (/*registers_too_p=*/0);
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}
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/* Observer for the normal_stop notification. */
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static void
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tui_normal_stop (struct bpstats *bs, int print_frame)
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{
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/* This refresh is intended to catch changes to the selected frame and to
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registers following a normal stop. */
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tui_refresh_frame_and_register_information (/*registers_too_p=*/1);
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}
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/* Observers created when installing TUI hooks. */
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static struct observer *tui_bp_created_observer;
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static struct observer *tui_bp_deleted_observer;
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static struct observer *tui_bp_modified_observer;
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static struct observer *tui_inferior_exit_observer;
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static struct observer *tui_about_to_proceed_observer;
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static struct observer *tui_before_prompt_observer;
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static struct observer *tui_normal_stop_observer;
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/* Install the TUI specific hooks. */
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void
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tui_install_hooks (void)
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{
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deprecated_selected_frame_level_changed_hook
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= tui_selected_frame_level_changed_hook;
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/* If this hook is not set to something then print_frame_info will
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assume that the CLI, not the TUI, is active, and will print the frame info
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for us in such a way that we are not prepared to handle. This hook is
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otherwise effectively obsolete. */
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deprecated_print_frame_info_listing_hook
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= tui_print_frame_info_listing_hook;
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= tui_dummy_print_frame_info_listing_hook;
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/* Install the event hooks. */
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tui_bp_created_observer
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@ -218,6 +245,10 @@ tui_install_hooks (void)
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= observer_attach_inferior_exit (tui_inferior_exit);
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tui_about_to_proceed_observer
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= observer_attach_about_to_proceed (tui_about_to_proceed);
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tui_before_prompt_observer
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= observer_attach_before_prompt (tui_before_prompt);
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tui_normal_stop_observer
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= observer_attach_normal_stop (tui_normal_stop);
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deprecated_register_changed_hook = tui_register_changed_hook;
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}
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@ -226,7 +257,6 @@ tui_install_hooks (void)
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void
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tui_remove_hooks (void)
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{
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deprecated_selected_frame_level_changed_hook = 0;
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deprecated_print_frame_info_listing_hook = 0;
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deprecated_query_hook = 0;
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deprecated_register_changed_hook = 0;
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@ -242,6 +272,10 @@ tui_remove_hooks (void)
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tui_inferior_exit_observer = NULL;
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observer_detach_about_to_proceed (tui_about_to_proceed_observer);
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tui_about_to_proceed_observer = NULL;
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observer_detach_before_prompt (tui_before_prompt_observer);
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tui_before_prompt_observer = NULL;
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observer_detach_normal_stop (tui_normal_stop_observer);
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tui_normal_stop_observer = NULL;
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}
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void _initialize_tui_hooks (void);
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