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gdb/tui: avoid extra refresh_window on vertical scroll

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While working on the previous couple of patches I noticed that when I
scroll the src and asm windows vertically, I get two refresh_window
calls.

The two calls can be traced back to
tui_source_window_base::update_source_window_as_is, in here we call
show_source_content, which calls refresh_window, and then
update_exec_info, which also calls refresh_window.

In this commit I propose making the refresh_window call in
update_exec_info optional.  In update_source_window_as_is I'll then
call update_exec_info before calling show_source_content, and pass a
flag to update_exec_info to defer the refresh.

There are places where update_exec_info is used without any subsequent
refresh_window call (e.g. when a breakpoint is updated), so
update_exec_info does not to call refresh_window in some cases, which
is why I'm using a flag to control the refresh.

With this changes I'm now only seeing a single refresh_window call for
each vertical scroll.

There should be no user visible changes after this commit.
This commit is contained in:
Andrew Burgess 2023-01-05 12:26:09 +00:00
parent d2a5ea5622
commit 99c15700fd
2 changed files with 14 additions and 7 deletions
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12
gdb/tui/tui-winsource.c
View File

@ -172,8 +172,8 @@ tui_source_window_base::update_source_window_as_is
{
validate_scroll_offsets ();
update_breakpoint_info (nullptr, false);
update_exec_info (false);
show_source_content ();
update_exec_info ();
}
}
@ -636,11 +636,10 @@ tui_source_window_base::update_breakpoint_info
return need_refresh;
}
/* Function to initialize the content of the execution info window,
based upon the input window which is either the source or
disassembly window. */
/* See tui-winsource.h. */
void
tui_source_window_base::update_exec_info ()
tui_source_window_base::update_exec_info (bool refresh_p)
{
update_breakpoint_info (nullptr, true);
for (int i = 0; i < m_content.size (); i++)
@ -668,5 +667,6 @@ tui_source_window_base::update_exec_info ()
show_line_number (i);
}
refresh_window ();
if (refresh_p)
refresh_window ();
}

9
gdb/tui/tui-winsource.h
View File

@ -148,7 +148,14 @@ struct tui_source_window_base : public tui_win_info
virtual bool location_matches_p (struct bp_location *loc, int line_no) = 0;
void update_exec_info ();
/* Fill in the left margin of the current window with execution indicator
information, e.g. breakpoint indicators, and line numbers. When
REFRESH_P is true this function will call refresh_window to ensure
updates are written to the screen, otherwise the refresh is skipped,
which will leave the on screen contents out of date. When passing
false for REFRESH_P you should be planning to call refresh_window
yourself. */
void update_exec_info (bool refresh_p = true);
/* Update the window to display the given location. Does nothing if
the location is already displayed. */