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<title>Debugging with GDB: TUI Overview</title>
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<a name="TUI-Overview"></a>
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<div class="header">
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<p>
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Next: <a href="TUI-Keys.html#TUI-Keys" accesskey="n" rel="next">TUI Keys</a>, Up: <a href="TUI.html#TUI" accesskey="u" rel="up">TUI</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p>
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<hr>
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<a name="TUI-Overview-1"></a>
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<h3 class="section">25.1 TUI Overview</h3>
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<p>In TUI mode, <small>GDB</small> can display several text windows:
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</p>
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<dl compact="compact">
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<dt><em>command</em></dt>
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<dd><p>This window is the <small>GDB</small> command window with the <small>GDB</small>
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prompt and the <small>GDB</small> output. The <small>GDB</small> input is still
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managed using readline.
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</p>
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</dd>
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<dt><em>source</em></dt>
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<dd><p>The source window shows the source file of the program. The current
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line and active breakpoints are displayed in this window.
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</p>
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</dd>
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<dt><em>assembly</em></dt>
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<dd><p>The assembly window shows the disassembly output of the program.
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</p>
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</dd>
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<dt><em>register</em></dt>
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<dd><p>This window shows the processor registers. Registers are highlighted
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when their values change.
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</p></dd>
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</dl>
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<p>The source and assembly windows show the current program position
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by highlighting the current line and marking it with a ‘<samp>></samp>’ marker.
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Breakpoints are indicated with two markers. The first marker
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indicates the breakpoint type:
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</p>
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<dl compact="compact">
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<dt><code>B</code></dt>
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<dd><p>Breakpoint which was hit at least once.
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</p>
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</dd>
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<dt><code>b</code></dt>
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<dd><p>Breakpoint which was never hit.
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</p>
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</dd>
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<dt><code>H</code></dt>
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<dd><p>Hardware breakpoint which was hit at least once.
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</p>
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</dd>
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<dt><code>h</code></dt>
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<dd><p>Hardware breakpoint which was never hit.
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</p></dd>
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</dl>
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<p>The second marker indicates whether the breakpoint is enabled or not:
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</p>
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<dl compact="compact">
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<dt><code>+</code></dt>
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<dd><p>Breakpoint is enabled.
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</p>
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</dd>
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<dt><code>-</code></dt>
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<dd><p>Breakpoint is disabled.
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</p></dd>
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</dl>
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<p>The source, assembly and register windows are updated when the current
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thread changes, when the frame changes, or when the program counter
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changes.
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</p>
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<p>These windows are not all visible at the same time. The command
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window is always visible. The others can be arranged in several
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layouts:
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</p>
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<ul>
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<li> source only,
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</li><li> assembly only,
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</li><li> source and assembly,
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</li><li> source and registers, or
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</li><li> assembly and registers.
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</li></ul>
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<p>These are the standard layouts, but other layouts can be defined.
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</p>
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<p>A status line above the command window shows the following information:
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</p>
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<dl compact="compact">
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<dt><em>target</em></dt>
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<dd><p>Indicates the current <small>GDB</small> target.
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(see <a href="Targets.html#Targets">Specifying a Debugging Target</a>).
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</p>
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</dd>
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<dt><em>process</em></dt>
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<dd><p>Gives the current process or thread number.
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When no process is being debugged, this field is set to <code>No process</code>.
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</p>
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</dd>
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<dt><em>function</em></dt>
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<dd><p>Gives the current function name for the selected frame.
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The name is demangled if demangling is turned on (see <a href="Print-Settings.html#Print-Settings">Print Settings</a>).
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When there is no symbol corresponding to the current program counter,
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the string <code>??</code> is displayed.
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</p>
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</dd>
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<dt><em>line</em></dt>
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<dd><p>Indicates the current line number for the selected frame.
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When the current line number is not known, the string <code>??</code> is displayed.
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</p>
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</dd>
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<dt><em>pc</em></dt>
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<dd><p>Indicates the current program counter address.
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</p></dd>
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</dl>
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<hr>
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<div class="header">
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<p>
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Next: <a href="TUI-Keys.html#TUI-Keys" accesskey="n" rel="next">TUI Keys</a>, Up: <a href="TUI.html#TUI" accesskey="u" rel="up">TUI</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p>
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