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  1. <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

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  18. <title>Trace Files (Debugging with GDB)</title>

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  27. <link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">

  28. <link href="Tracepoints.html#Tracepoints" rel="up" title="Tracepoints">

  29. <link href="Overlays.html#Overlays" rel="next" title="Overlays">

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  63. <a name="Trace-Files"></a>

  64. <div class="header">

  65. <p>

  66. Previous: <a href="Tracepoint-Variables.html#Tracepoint-Variables" accesskey="p" rel="prev">Tracepoint Variables</a>, Up: <a href="Tracepoints.html#Tracepoints" accesskey="u" rel="up">Tracepoints</a> &nbsp; [<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>

  67. </div>

  68. <hr>

  69. <a name="Using-Trace-Files"></a>

  70. <h3 class="section">13.4 Using Trace Files</h3>

  71. <a name="index-trace-files"></a>

  72. 

  73. <p>In some situations, the target running a trace experiment may no

  74. longer be available; perhaps it crashed, or the hardware was needed

  75. for a different activity.  To handle these cases, you can arrange to

  76. dump the trace data into a file, and later use that file as a source

  77. of trace data, via the <code>target tfile</code> command.

  78. </p>

  79. <dl compact="compact">

  80. <dd>

  81. <a name="index-tsave"></a>

  82. </dd>

  83. <dt><code>tsave [ -r ] <var>filename</var></code></dt>

  84. <dt><code>tsave [-ctf] <var>dirname</var></code></dt>

  85. <dd><p>Save the trace data to <var>filename</var>.  By default, this command

  86. assumes that <var>filename</var> refers to the host filesystem, so if

  87. necessary <small>GDB</small> will copy raw trace data up from the target and

  88. then save it.  If the target supports it, you can also supply the

  89. optional argument <code>-r</code> (&ldquo;remote&rdquo;) to direct the target to save

  90. the data directly into <var>filename</var> in its own filesystem, which may be

  91. more efficient if the trace buffer is very large.  (Note, however, that

  92. <code>target tfile</code> can only read from files accessible to the host.)

  93. By default, this command will save trace frame in tfile format.

  94. You can supply the optional argument <code>-ctf</code> to save data in CTF

  95. format.  The <em>Common Trace Format</em> (CTF) is proposed as a trace format

  96. that can be shared by multiple debugging and tracing tools.  Please go to

  97. &lsquo;<code>http://www.efficios.com/ctf</code>&rsquo; to get more information.

  98. </p>

  99. <a name="index-target-tfile"></a>

  100. <a name="index-tfile"></a>

  101. <a name="index-target-ctf"></a>

  102. <a name="index-ctf"></a>

  103. </dd>

  104. <dt><code>target tfile <var>filename</var></code></dt>

  105. <dt><code>target ctf <var>dirname</var></code></dt>

  106. <dd><p>Use the file named <var>filename</var> or directory named <var>dirname</var> as

  107. a source of trace data.  Commands that examine data work as they do with

  108. a live target, but it is not possible to run any new trace experiments.

  109. <code>tstatus</code> will report the state of the trace run at the moment

  110. the data was saved, as well as the current trace frame you are examining.

  111. Both <var>filename</var> and <var>dirname</var> must be on a filesystem accessible to

  112. the host.

  113. </p>

  114. <div class="smallexample">

  115. <pre class="smallexample">(gdb) target ctf ctf.ctf

  116. (gdb) tfind

  117. Found trace frame 0, tracepoint 2

  118. 39            ++a;  /* set tracepoint 1 here */

  119. (gdb) tdump

  120. Data collected at tracepoint 2, trace frame 0:

  121. i = 0

  122. a = 0

  123. b = 1 '\001'

  124. c = {&quot;123&quot;, &quot;456&quot;, &quot;789&quot;, &quot;123&quot;, &quot;456&quot;, &quot;789&quot;}

  125. d = {{{a = 1, b = 2}, {a = 3, b = 4}}, {{a = 5, b = 6}, {a = 7, b = 8}}}

  126. (gdb) p b

  127. $1 = 1

  128. </pre></div>

  129. 

  130. </dd>

  131. </dl>

  132. 

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