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<title>Debugging with GDB: Linespec Locations</title>
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<a name="Linespec-Locations"></a>
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<div class="header">
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<p>
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Next: <a href="Explicit-Locations.html#Explicit-Locations" accesskey="n" rel="next">Explicit Locations</a>, Up: <a href="Specify-Location.html#Specify-Location" accesskey="u" rel="up">Specify Location</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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<a name="Linespec-Locations-1"></a>
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<h4 class="subsection">9.2.1 Linespec Locations</h4>
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<a name="index-linespec-locations"></a>
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<p>A <em>linespec</em> is a colon-separated list of source location parameters such
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as file name, function name, etc. Here are all the different ways of
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specifying a linespec:
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</p>
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<dl compact="compact">
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<dt><code><var>linenum</var></code></dt>
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<dd><p>Specifies the line number <var>linenum</var> of the current source file.
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</p>
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</dd>
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<dt><code>-<var>offset</var></code></dt>
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<dt><code>+<var>offset</var></code></dt>
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<dd><p>Specifies the line <var>offset</var> lines before or after the <em>current
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line</em>. For the <code>list</code> command, the current line is the last one
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printed; for the breakpoint commands, this is the line at which
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execution stopped in the currently selected <em>stack frame</em>
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(see <a href="Frames.html#Frames">Frames</a>, for a description of stack frames.) When
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used as the second of the two linespecs in a <code>list</code> command,
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this specifies the line <var>offset</var> lines up or down from the first
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linespec.
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</p>
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</dd>
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<dt><code><var>filename</var>:<var>linenum</var></code></dt>
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<dd><p>Specifies the line <var>linenum</var> in the source file <var>filename</var>.
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If <var>filename</var> is a relative file name, then it will match any
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source file name with the same trailing components. For example, if
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<var>filename</var> is ‘<samp>gcc/expr.c</samp>’, then it will match source file
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name of <samp>/build/trunk/gcc/expr.c</samp>, but not
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<samp>/build/trunk/libcpp/expr.c</samp> or <samp>/build/trunk/gcc/x-expr.c</samp>.
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</p>
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</dd>
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<dt><code><var>function</var></code></dt>
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<dd><p>Specifies the line that begins the body of the function <var>function</var>.
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For example, in C, this is the line with the open brace.
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</p>
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<p>By default, in C<tt>++</tt> and Ada, <var>function</var> is interpreted as
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specifying all functions named <var>function</var> in all scopes. For
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C<tt>++</tt>, this means in all namespaces and classes. For Ada, this
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means in all packages.
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</p>
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<p>For example, assuming a program with C<tt>++</tt> symbols named
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<code>A::B::func</code> and <code>B::func</code>, both commands <kbd>break func</kbd><!-- /@w --> and <kbd>break B::func</kbd><!-- /@w --> set a breakpoint on both symbols.
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</p>
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<p>Commands that accept a linespec let you override this with the
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<code>-qualified</code> option. For example, <kbd>break <span class="nolinebreak">-qualified</span> func</kbd><!-- /@w --> sets a breakpoint on a free-function named <code>func</code> ignoring
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any C<tt>++</tt> class methods and namespace functions called <code>func</code>.
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</p>
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<p>See <a href="Explicit-Locations.html#Explicit-Locations">Explicit Locations</a>.
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</p>
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</dd>
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<dt><code><var>function</var>:<var>label</var></code></dt>
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<dd><p>Specifies the line where <var>label</var> appears in <var>function</var>.
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</p>
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</dd>
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<dt><code><var>filename</var>:<var>function</var></code></dt>
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<dd><p>Specifies the line that begins the body of the function <var>function</var>
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in the file <var>filename</var>. You only need the file name with a
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function name to avoid ambiguity when there are identically named
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functions in different source files.
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</p>
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</dd>
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<dt><code><var>label</var></code></dt>
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<dd><p>Specifies the line at which the label named <var>label</var> appears
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in the function corresponding to the currently selected stack frame.
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If there is no current selected stack frame (for instance, if the inferior
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is not running), then <small>GDB</small> will not search for a label.
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</p>
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<a name="index-breakpoint-at-static-probe-point"></a>
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</dd>
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<dt><code>-pstap|-probe-stap <span class="roman">[</span><var>objfile</var>:<span class="roman">[</span><var>provider</var>:<span class="roman">]</span><span class="roman">]</span><var>name</var></code></dt>
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<dd><p>The <small>GNU</small>/Linux tool <code>SystemTap</code> provides a way for
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applications to embed static probes. See <a href="Static-Probe-Points.html#Static-Probe-Points">Static Probe Points</a>, for more
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information on finding and using static probes. This form of linespec
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specifies the location of such a static probe.
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</p>
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<p>If <var>objfile</var> is given, only probes coming from that shared library
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or executable matching <var>objfile</var> as a regular expression are considered.
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If <var>provider</var> is given, then only probes from that provider are considered.
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If several probes match the spec, <small>GDB</small> will insert a breakpoint at
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each one of those probes.
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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="Explicit-Locations.html#Explicit-Locations" accesskey="n" rel="next">Explicit Locations</a>, Up: <a href="Specify-Location.html#Specify-Location" accesskey="u" rel="up">Specify Location</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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