TUI Overview

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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:
     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.
     The source window shows the source file of the program.  The
     current line as well as active breakpoints are displayed in this
     The assembly window shows the disassembly output of the program.
     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 and assembly windows show the current program position by
highlighting the current line and marking them with the `>' marker.
Breakpoints are also indicated with two markers.  A first one indicates
the breakpoint type:
     Breakpoint which was hit at least once.
     Breakpoint which was never hit.
     Hardware breakpoint which was hit at least once.
     Hardware breakpoint which was never hit.
   The second marker indicates whether the breakpoint is enabled or not:
     Breakpoint is enabled.
     Breakpoint is disabled.
   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
   On top of the command window a status line gives various information
concerning the current process begin debugged.  The status line is
updated when the information it shows changes.  The following fields
are displayed:
     Indicates the current gdb target (*note Specifying a Debugging
     Target: Targets.).
     Gives information about the current process or thread number.
     When no process is being debugged, this field is set to `No
     Gives the current function name for the selected frame.  The name
     is demangled if demangling is turned on (*note Print Settings::).
     When there is no symbol corresponding to the current program
     counter the string `??' is displayed.
     Indicates the current line number for the selected frame.  When
     the current line number is not known the string `??' is displayed.
     Indicates the current program counter address.