TUI overview
============
The TUI has two display modes that can be switched while GDB runs:
* A curses (or TUI) mode in which it displays several text windows
on the terminal.
* A standard mode which corresponds to the GDB configured without
the TUI.
In the TUI mode, GDB can display several text window on the terminal:
_command_
This window is the GDB command window with the GDB prompt and the
GDB outputs. The GDB input is still managed using readline but
through the TUI. The _command_ window is always visible.
_source_
The source window shows the source file of the program. The
current line as well as active breakpoints are displayed in this
window. The current program position is shown with the `>' marker
and active breakpoints are shown with `*' markers.
_assembly_
The assembly window shows the disassembly output of the program.
_register_
This window shows the processor registers. It detects when a
register is changed and when this is the case, registers that have
changed are highlighted.
The source, assembly and register windows are attached to the thread
and the frame position. They are updated when the current thread
changes, when the frame changes or when the program counter changes.
These three windows are arranged by the TUI according to several
layouts. The layout defines which of these three windows are visible.
The following layouts are available:
* source
* assembly
* source and assembly
* source and registers
* assembly and registers