22.1 TUI Overview

In TUI mode, No value for GDBN can display several text windows:

command

This window is the No value for GDBN command window with the No value for GDBN prompt and the No value for GDBN output. The No value for GDBN input is still managed using readline.

source

The source window shows the source file of the program. The current line and active breakpoints are displayed in this window.

assembly

The assembly window shows the disassembly output of the program.

register

This window shows the processor registers. Registers are highlighted when their values change.

The source and assembly windows show the current program position by highlighting the current line and marking it with a ‘>’ marker. Breakpoints are indicated with two markers. The first marker indicates the breakpoint type:

B

Breakpoint which was hit at least once.

b

Breakpoint which was never hit.

H

Hardware breakpoint which was hit at least once.

h

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 updated when the current thread changes, when the frame changes, or when the program counter changes.

These windows are not all visible at the same time. The command window is always visible. The others can be arranged in several layouts:

• source only,
• assembly only,
• source and assembly,
• source and registers, or
• assembly and registers.

A status line above the command window shows the following information:

target

Indicates the current No value for GDBN target. (see section Specifying a Debugging Target).

process

Gives the current process or thread number. When no process is being debugged, this field is set to No process.

function

Gives the current function name for the selected frame. The name is demangled if demangling is turned on (see section Print Settings). When there is no symbol corresponding to the current program counter, the string ?? is displayed.

line

Indicates the current line number for the selected frame. When the current line number is not known, the string ?? is displayed.

pc

Indicates the current program counter address.