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126 lines
4.9 KiB
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126 lines
4.9 KiB
HTML
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<head>
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<title>Tracepoint Variables (Debugging with GDB)</title>
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<meta name="description" content="Tracepoint Variables (Debugging with GDB)">
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<link href="index.html#Top" rel="start" title="Top">
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<link href="Concept-Index.html#Concept-Index" rel="index" title="Concept Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="Tracepoints.html#Tracepoints" rel="up" title="Tracepoints">
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<link href="Trace-Files.html#Trace-Files" rel="next" title="Trace Files">
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<a name="Tracepoint-Variables"></a>
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<div class="header">
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<p>
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Next: <a href="Trace-Files.html#Trace-Files" accesskey="n" rel="next">Trace Files</a>, Previous: <a href="Analyze-Collected-Data.html#Analyze-Collected-Data" accesskey="p" rel="prev">Analyze Collected Data</a>, Up: <a href="Tracepoints.html#Tracepoints" accesskey="u" rel="up">Tracepoints</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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</div>
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<hr>
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<a name="Convenience-Variables-for-Tracepoints"></a>
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<h3 class="section">13.3 Convenience Variables for Tracepoints</h3>
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<a name="index-tracepoint-variables"></a>
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<a name="index-convenience-variables-for-tracepoints"></a>
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<dl compact="compact">
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<dd><a name="index-_0024trace_005fframe"></a>
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</dd>
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<dt><code>(int) $trace_frame</code></dt>
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<dd><p>The current trace snapshot (a.k.a. <em>frame</em>) number, or -1 if no
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snapshot is selected.
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</p>
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<a name="index-_0024tracepoint"></a>
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</dd>
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<dt><code>(int) $tracepoint</code></dt>
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<dd><p>The tracepoint for the current trace snapshot.
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</p>
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<a name="index-_0024trace_005fline"></a>
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</dd>
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<dt><code>(int) $trace_line</code></dt>
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<dd><p>The line number for the current trace snapshot.
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</p>
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<a name="index-_0024trace_005ffile"></a>
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</dd>
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<dt><code>(char []) $trace_file</code></dt>
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<dd><p>The source file for the current trace snapshot.
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</p>
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<a name="index-_0024trace_005ffunc"></a>
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</dd>
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<dt><code>(char []) $trace_func</code></dt>
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<dd><p>The name of the function containing <code>$tracepoint</code>.
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</p></dd>
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</dl>
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<p>Note: <code>$trace_file</code> is not suitable for use in <code>printf</code>,
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use <code>output</code> instead.
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</p>
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<p>Here’s a simple example of using these convenience variables for
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stepping through all the trace snapshots and printing some of their
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data. Note that these are not the same as trace state variables,
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which are managed by the target.
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</p>
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<div class="smallexample">
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<pre class="smallexample">(gdb) <b>tfind start</b>
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(gdb) <b>while $trace_frame != -1</b>
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> output $trace_file
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> printf ", line %d (tracepoint #%d)\n", $trace_line, $tracepoint
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> tfind
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> end
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</pre></div>
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</body>
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</html>
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