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133 lines
5.5 KiB
HTML
133 lines
5.5 KiB
HTML
<!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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<head>
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<title>Traceframe Info Format (Debugging with GDB)</title>
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<meta name="description" content="Traceframe Info Format (Debugging with GDB)">
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<meta name="keywords" content="Traceframe Info Format (Debugging with GDB)">
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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="Remote-Protocol.html#Remote-Protocol" rel="up" title="Remote Protocol">
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<link href="Branch-Trace-Format.html#Branch-Trace-Format" rel="next" title="Branch Trace Format">
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<link href="Thread-List-Format.html#Thread-List-Format" rel="prev" title="Thread List Format">
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<a name="Traceframe-Info-Format"></a>
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<div class="header">
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<p>
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Next: <a href="Branch-Trace-Format.html#Branch-Trace-Format" accesskey="n" rel="next">Branch Trace Format</a>, Previous: <a href="Thread-List-Format.html#Thread-List-Format" accesskey="p" rel="prev">Thread List Format</a>, Up: <a href="Remote-Protocol.html#Remote-Protocol" accesskey="u" rel="up">Remote Protocol</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="Traceframe-Info-Format-1"></a>
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<h3 class="section">E.18 Traceframe Info Format</h3>
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<a name="index-traceframe-info-format"></a>
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<p>To be able to know which objects in the inferior can be examined when
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inspecting a tracepoint hit, <small>GDB</small> 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>
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<p>This list is obtained using the ‘<samp>qXfer:traceframe-info:read</samp>’
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(see <a href="General-Query-Packets.html#qXfer-traceframe-info-read">qXfer traceframe info read</a>) packet and is an XML document.
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</p>
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<p><small>GDB</small> must be linked with the Expat library to support XML
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traceframe info discovery. See <a href="Requirements.html#Expat">Expat</a>.
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</p>
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<p>The top-level structure of the document is shown below:
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</p>
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<div class="smallexample">
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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></div>
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<p>Each traceframe block can be either:
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</p>
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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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<div class="smallexample">
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<pre class="smallexample"><memory start="<var>addr</var>" length="<var>length</var>"/>
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</pre></div>
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</li><li> A block indicating trace state variable numbered <var>number</var> has been
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collected:
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<div class="smallexample">
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<pre class="smallexample"><tvar id="<var>number</var>"/>
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</pre></div>
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</li></ul>
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<p>The formal DTD for the traceframe info format is given below:
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</p>
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<div class="smallexample">
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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></div>
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</body>
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</html>
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