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102 lines
5.0 KiB
HTML
102 lines
5.0 KiB
HTML
4 years ago
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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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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Invariant Sections being "Free Software" and "Free Software Needs
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Free Documentation", with the Front-Cover Texts being "A GNU Manual,"
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and with the Back-Cover Texts as in (a) below.
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(a) The FSF's Back-Cover Text is: "You are free to copy and modify
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this GNU Manual. Buying copies from GNU Press supports the FSF in
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developing GNU and promoting software freedom." -->
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<!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ -->
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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="Analyze Collected Data (Debugging with GDB)">
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<meta name="keywords" content="Analyze Collected Data (Debugging with GDB)">
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<meta name="resource-type" content="document">
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<meta name="distribution" content="global">
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<meta name="Generator" content="makeinfo">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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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="tfind.html#tfind" rel="next" title="tfind">
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<link href="Tracepoint-Restrictions.html#Tracepoint-Restrictions" rel="prev" title="Tracepoint Restrictions">
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<style type="text/css">
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-->
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</style>
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</head>
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<body lang="en">
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<a name="Analyze-Collected-Data"></a>
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<div class="header">
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<p>
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Next: <a href="Tracepoint-Variables.html#Tracepoint-Variables" accesskey="n" rel="next">Tracepoint Variables</a>, Previous: <a href="Set-Tracepoints.html#Set-Tracepoints" accesskey="p" rel="prev">Set Tracepoints</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="Using-the-Collected-Data"></a>
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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 <small>GDB</small> commands
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for examining the trace data. The basic idea is that each tracepoint
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collects a trace <em>snapshot</em> 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 <em>focus</em> 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 <small>GDB</small> 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> <small>GDB</small> 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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</p>
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<table class="menu" border="0" cellspacing="0">
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<tr><td align="left" valign="top">• <a href="tfind.html#tfind" accesskey="1">tfind</a>:</td><td> </td><td align="left" valign="top">How to select a trace snapshot
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</td></tr>
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<tr><td align="left" valign="top">• <a href="tdump.html#tdump" accesskey="2">tdump</a>:</td><td> </td><td align="left" valign="top">How to display all data for a snapshot
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</td></tr>
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<tr><td align="left" valign="top">• <a href="save-tracepoints.html#save-tracepoints" accesskey="3">save tracepoints</a>:</td><td> </td><td align="left" valign="top">How to save tracepoints for a future run
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</td></tr>
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</table>
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</body>
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</html>
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