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152 lines
6.6 KiB
HTML
152 lines
6.6 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>Annotations Overview (Debugging with GDB)</title>
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<meta name="description" content="Annotations Overview (Debugging with GDB)">
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<meta name="keywords" content="Annotations Overview (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="Annotations.html#Annotations" rel="up" title="Annotations">
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<link href="Server-Prefix.html#Server-Prefix" rel="next" title="Server Prefix">
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<link href="Annotations.html#Annotations" rel="prev" title="Annotations">
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<style type="text/css">
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a.summary-letter {text-decoration: none}
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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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kbd {font-style: oblique}
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pre.format {font-family: inherit}
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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="Annotations-Overview"></a>
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<div class="header">
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<p>
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Next: <a href="Server-Prefix.html#Server-Prefix" accesskey="n" rel="next">Server Prefix</a>, Up: <a href="Annotations.html#Annotations" accesskey="u" rel="up">Annotations</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="What-is-an-Annotation_003f"></a>
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<h3 class="section">28.1 What is an Annotation?</h3>
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<a name="index-annotations"></a>
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<p>Annotations start with a newline character, two ‘<samp>control-z</samp>’
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characters, and the name of the annotation. If there is no additional
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information associated with this annotation, the name of the annotation
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is followed immediately by a newline. If there is additional
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information, the name of the annotation is followed by a space, the
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additional information, and a newline. The additional information
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cannot contain newline characters.
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</p>
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<p>Any output not beginning with a newline and two ‘<samp>control-z</samp>’
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characters denotes literal output from <small>GDB</small>. Currently there is
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no need for <small>GDB</small> to output a newline followed by two
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‘<samp>control-z</samp>’ characters, but if there was such a need, the
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annotations could be extended with an ‘<samp>escape</samp>’ annotation which
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means those three characters as output.
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</p>
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<p>The annotation <var>level</var>, which is specified using the
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<samp>--annotate</samp> command line option (see <a href="Mode-Options.html#Mode-Options">Mode Options</a>), controls
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how much information <small>GDB</small> prints together with its prompt,
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values of expressions, source lines, and other types of output. Level 0
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is for no annotations, level 1 is for use when <small>GDB</small> is run as a
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subprocess of <small>GNU</small> Emacs, level 3 is the maximum annotation suitable
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for programs that control <small>GDB</small>, and level 2 annotations have
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been made obsolete (see <a href="../annotate/Limitations.html#Limitations">Limitations of the Annotation
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Interface</a> in <cite>GDB’s Obsolete Annotations</cite>).
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</p>
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<dl compact="compact">
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<dd><a name="index-set-annotate"></a>
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</dd>
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<dt><code>set annotate <var>level</var></code></dt>
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<dd><p>The <small>GDB</small> command <code>set annotate</code> sets the level of
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annotations to the specified <var>level</var>.
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</p>
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</dd>
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<dt><code>show annotate</code></dt>
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<dd><a name="index-show-annotate"></a>
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<p>Show the current annotation level.
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</p></dd>
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</dl>
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<p>This chapter describes level 3 annotations.
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</p>
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<p>A simple example of starting up <small>GDB</small> with annotations is:
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</p>
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<div class="smallexample">
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<pre class="smallexample">$ <kbd>gdb --annotate=3</kbd>
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GNU gdb 6.0
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Copyright 2003 Free Software Foundation, Inc.
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GDB is free software, covered by the GNU General Public License,
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and you are welcome to change it and/or distribute copies of it
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under certain conditions.
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Type "show copying" to see the conditions.
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There is absolutely no warranty for GDB. Type "show warranty"
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for details.
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This GDB was configured as "i386-pc-linux-gnu"
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^Z^Zpre-prompt
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(gdb)
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^Z^Zprompt
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<kbd>quit</kbd>
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^Z^Zpost-prompt
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$
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</pre></div>
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<p>Here ‘<samp>quit</samp>’ is input to <small>GDB</small>; the rest is output from
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<small>GDB</small>. The three lines beginning ‘<samp>^Z^Z</samp>’ (where ‘<samp>^Z</samp>’
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denotes a ‘<samp>control-z</samp>’ character) are annotations; the rest is
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output from <small>GDB</small>.
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</p>
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<hr>
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<div class="header">
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<p>
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Next: <a href="Server-Prefix.html#Server-Prefix" accesskey="n" rel="next">Server Prefix</a>, Up: <a href="Annotations.html#Annotations" accesskey="u" rel="up">Annotations</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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</body>
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</html>
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