75 lines
3.7 KiB
HTML
75 lines
3.7 KiB
HTML
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<html lang="en">
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<head>
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<title>Analyze Collected Data - 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="Set-Tracepoints.html#Set-Tracepoints" title="Set Tracepoints">
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<link rel="next" href="Tracepoint-Variables.html#Tracepoint-Variables" title="Tracepoint Variables">
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<body>
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<div class="node">
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<a name="Analyze-Collected-Data"></a>
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<p>
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Next: <a rel="next" accesskey="n" href="Tracepoint-Variables.html#Tracepoint-Variables">Tracepoint Variables</a>,
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Previous: <a rel="previous" accesskey="p" href="Set-Tracepoints.html#Set-Tracepoints">Set Tracepoints</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">13.2 Using the Collected Data</h3>
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<p>After the tracepoint experiment ends, you use <span class="sc">gdb</span> commands
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for examining the trace data. The basic idea is that each tracepoint
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collects a trace <dfn>snapshot</dfn> every time it is hit and another
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snapshot every time it single-steps. All these snapshots are
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consecutively numbered from zero and go into a buffer, and you can
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examine them later. The way you examine them is to <dfn>focus</dfn> on a
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specific trace snapshot. When the remote stub is focused on a trace
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snapshot, it will respond to all <span class="sc">gdb</span> requests for memory and
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registers by reading from the buffer which belongs to that snapshot,
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rather than from <em>real</em> memory or registers of the program being
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debugged. This means that <strong>all</strong> <span class="sc">gdb</span> commands
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(<code>print</code>, <code>info registers</code>, <code>backtrace</code>, etc.) will
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behave as if we were currently debugging the program state as it was
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when the tracepoint occurred. Any requests for data that are not in
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the buffer will fail.
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<ul class="menu">
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<li><a accesskey="1" href="tfind.html#tfind">tfind</a>: How to select a trace snapshot
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<li><a accesskey="2" href="tdump.html#tdump">tdump</a>: How to display all data for a snapshot
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<li><a accesskey="3" href="save-tracepoints.html#save-tracepoints">save tracepoints</a>: How to save tracepoints for a future run
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</ul>
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</body></html>
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