101 lines
4.3 KiB
HTML
101 lines
4.3 KiB
HTML
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<title>Traceframe Info Format - Debugging with GDB</title>
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<a name="Traceframe-Info-Format"></a>
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<p>
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Next: <a rel="next" accesskey="n" href="Branch-Trace-Format.html#Branch-Trace-Format">Branch Trace Format</a>,
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Previous: <a rel="previous" accesskey="p" href="Thread-List-Format.html#Thread-List-Format">Thread List Format</a>,
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Up: <a rel="up" accesskey="u" href="Remote-Protocol.html#Remote-Protocol">Remote Protocol</a>
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<h3 class="section">E.18 Traceframe Info Format</h3>
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<p><a name="index-traceframe-info-format-3635"></a>
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To be able to know which objects in the inferior can be examined when
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inspecting a tracepoint hit, <span class="sc">gdb</span> needs to obtain the list of
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memory ranges, registers and trace state variables that have been
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collected in a traceframe.
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<p>This list is obtained using the ‘<samp><span class="samp">qXfer:traceframe-info:read</span></samp>’
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(see <a href="qXfer-traceframe-info-read.html#qXfer-traceframe-info-read">qXfer traceframe info read</a>) packet and is an XML document.
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<p><span class="sc">gdb</span> must be linked with the Expat library to support XML
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traceframe info discovery. See <a href="Expat.html#Expat">Expat</a>.
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<p>The top-level structure of the document is shown below:
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<pre class="smallexample"> <?xml version="1.0"?>
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<!DOCTYPE traceframe-info
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PUBLIC "+//IDN gnu.org//DTD GDB Memory Map V1.0//EN"
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"http://sourceware.org/gdb/gdb-traceframe-info.dtd">
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<traceframe-info>
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block...
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</traceframe-info>
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</pre>
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<p>Each traceframe block can be either:
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<ul>
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<li>A region of collected memory starting at <var>addr</var> and extending for
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<var>length</var> bytes from there:
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<pre class="smallexample"> <memory start="<var>addr</var>" length="<var>length</var>"/>
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</pre>
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<li>A block indicating trace state variable numbered <var>number</var> has been
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collected:
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<pre class="smallexample"> <tvar id="<var>number</var>"/>
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</pre>
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</ul>
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<p>The formal DTD for the traceframe info format is given below:
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<pre class="smallexample"> <!ELEMENT traceframe-info (memory | tvar)* >
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<!ATTLIST traceframe-info version CDATA #FIXED "1.0">
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<!ELEMENT memory EMPTY>
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<!ATTLIST memory start CDATA #REQUIRED
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length CDATA #REQUIRED>
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<!ELEMENT tvar>
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<!ATTLIST tvar id CDATA #REQUIRED>
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</pre>
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</body></html>
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