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134 lines
5.4 KiB
HTML
134 lines
5.4 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>Branch Trace Format (Debugging with GDB)</title>
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<meta name="description" content="Branch Trace Format (Debugging with GDB)">
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<meta name="keywords" content="Branch Trace Format (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="Remote-Protocol.html#Remote-Protocol" rel="up" title="Remote Protocol">
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<link href="Branch-Trace-Configuration-Format.html#Branch-Trace-Configuration-Format" rel="next" title="Branch Trace Configuration Format">
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<link href="Traceframe-Info-Format.html#Traceframe-Info-Format" rel="prev" title="Traceframe Info Format">
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<style type="text/css">
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<!--
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a.summary-letter {text-decoration: none}
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blockquote.indentedblock {margin-right: 0em}
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blockquote.smallindentedblock {margin-right: 0em; font-size: smaller}
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blockquote.smallquotation {font-size: smaller}
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div.display {margin-left: 3.2em}
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div.example {margin-left: 3.2em}
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div.lisp {margin-left: 3.2em}
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div.smalldisplay {margin-left: 3.2em}
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div.smallexample {margin-left: 3.2em}
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div.smalllisp {margin-left: 3.2em}
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kbd {font-style: oblique}
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pre.display {font-family: inherit}
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pre.format {font-family: inherit}
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pre.menu-comment {font-family: serif}
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pre.menu-preformatted {font-family: serif}
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pre.smalldisplay {font-family: inherit; font-size: smaller}
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pre.smallexample {font-size: smaller}
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pre.smallformat {font-family: inherit; font-size: smaller}
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pre.smalllisp {font-size: smaller}
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span.nolinebreak {white-space: nowrap}
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span.roman {font-family: initial; font-weight: normal}
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span.sansserif {font-family: sans-serif; font-weight: normal}
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ul.no-bullet {list-style: none}
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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="Branch-Trace-Format"></a>
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<div class="header">
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<p>
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Next: <a href="Branch-Trace-Configuration-Format.html#Branch-Trace-Configuration-Format" accesskey="n" rel="next">Branch Trace Configuration Format</a>, Previous: <a href="Traceframe-Info-Format.html#Traceframe-Info-Format" accesskey="p" rel="prev">Traceframe Info 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="Branch-Trace-Format-1"></a>
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<h3 class="section">E.19 Branch Trace Format</h3>
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<a name="index-branch-trace-format"></a>
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<p>In order to display the branch trace of an inferior thread,
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<small>GDB</small> needs to obtain the list of branches. This list is
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represented as list of sequential code blocks that are connected via
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branches. The code in each block has been executed sequentially.
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</p>
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<p>This list is obtained using the ‘<samp>qXfer:btrace:read</samp>’
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(see <a href="General-Query-Packets.html#qXfer-btrace-read">qXfer btrace 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 btrace
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PUBLIC "+//IDN gnu.org//DTD GDB Branch Trace V1.0//EN"
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"http://sourceware.org/gdb/gdb-btrace.dtd">
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<btrace>
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block...
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</btrace>
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</pre></div>
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<ul>
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<li> A block of sequentially executed instructions starting at <var>begin</var>
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and ending at <var>end</var>:
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<div class="smallexample">
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<pre class="smallexample"><block begin="<var>begin</var>" end="<var>end</var>"/>
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</pre></div>
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</li></ul>
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<p>The formal DTD for the branch trace format is given below:
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</p>
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<div class="smallexample">
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<pre class="smallexample"><!ELEMENT btrace (block* | pt) >
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<!ATTLIST btrace version CDATA #FIXED "1.0">
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<!ELEMENT block EMPTY>
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<!ATTLIST block begin CDATA #REQUIRED
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end CDATA #REQUIRED>
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<!ELEMENT pt (pt-config?, raw?)>
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<!ELEMENT pt-config (cpu?)>
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<!ELEMENT cpu EMPTY>
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<!ATTLIST cpu vendor CDATA #REQUIRED
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family CDATA #REQUIRED
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model CDATA #REQUIRED
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stepping CDATA #REQUIRED>
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<!ELEMENT raw (#PCDATA)>
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</pre></div>
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</body>
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</html>
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