84 lines
3.7 KiB
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84 lines
3.7 KiB
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<html lang="en">
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<title>Tracepoint Variables - Debugging with GDB</title>
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<meta name="description" content="Debugging with GDB">
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<link title="Top" rel="start" href="index.html#Top">
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<link rel="up" href="Tracepoints.html#Tracepoints" title="Tracepoints">
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<link rel="prev" href="Analyze-Collected-Data.html#Analyze-Collected-Data" title="Analyze Collected Data">
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<link rel="next" href="Trace-Files.html#Trace-Files" title="Trace Files">
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Copyright (C) 1988-2019 Free Software Foundation, Inc.
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Permission is granted to copy, distribute and/or modify this document
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under the terms of the GNU Free Documentation License, Version 1.3 or
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any later version published by the Free Software Foundation; with the
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<div class="node">
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<a name="Tracepoint-Variables"></a>
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<p>
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Next: <a rel="next" accesskey="n" href="Trace-Files.html#Trace-Files">Trace Files</a>,
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Previous: <a rel="previous" accesskey="p" href="Analyze-Collected-Data.html#Analyze-Collected-Data">Analyze Collected Data</a>,
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Up: <a rel="up" accesskey="u" href="Tracepoints.html#Tracepoints">Tracepoints</a>
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<hr>
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</div>
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<h3 class="section">13.3 Convenience Variables for Tracepoints</h3>
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<p><a name="index-tracepoint-variables-936"></a><a name="index-convenience-variables-for-tracepoints-937"></a>
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<a name="index-g_t_0024trace_005fframe-938"></a>
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<dl><dt><code>(int) $trace_frame</code><dd>The current trace snapshot (a.k.a. <dfn>frame</dfn>) number, or -1 if no
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snapshot is selected.
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<p><a name="index-g_t_0024tracepoint-939"></a><br><dt><code>(int) $tracepoint</code><dd>The tracepoint for the current trace snapshot.
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<p><a name="index-g_t_0024trace_005fline-940"></a><br><dt><code>(int) $trace_line</code><dd>The line number for the current trace snapshot.
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<p><a name="index-g_t_0024trace_005ffile-941"></a><br><dt><code>(char []) $trace_file</code><dd>The source file for the current trace snapshot.
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<p><a name="index-g_t_0024trace_005ffunc-942"></a><br><dt><code>(char []) $trace_func</code><dd>The name of the function containing <code>$tracepoint</code>.
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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>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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<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>
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</body></html>
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