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author	alk3pInjection <webmaster@raspii.tech>	2024-02-04 16:16:35 +0800
committer	alk3pInjection <webmaster@raspii.tech>	2024-02-04 16:16:35 +0800
commit	6ce4ebed87858ecdd79a1091367c6e961055daa9 (patch)
tree	1c2a6a60531acf791531bbd9c8ac14c23ef8a66c /share/doc/annotate/Value-Annotations.html

Import stripped Arm GNU Toolchain 13.2.Rel1HEAD umineko

https://developer.arm.com/downloads/-/arm-gnu-toolchain-downloads Change-Id: I7303388733328cd98ab9aa3c30236db67f2e9e9c

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

+<html>

+Permission is granted to copy, distribute and/or modify this document

+under the terms of the GNU Free Documentation License, Version 1.3 or

+any later version published by the Free Software Foundation; with no

+Invariant Sections, with no Front-Cover Texts, and with no Back-Cover

+Texts. A copy of the license is included in the section entitled "GNU

+Free Documentation License". -->

+

+<head>

+<title>GDB’s Obsolete Annotations: Value Annotations</title>

+<meta name="description" content="GDB’s Obsolete Annotations: Value Annotations">

+<meta name="keywords" content="GDB’s Obsolete Annotations: Value Annotations">

+<meta name="resource-type" content="document">

+<meta name="distribution" content="global">

+<meta name="Generator" content="makeinfo">

+<meta http-equiv="Content-Type" content="text/html; charset=utf-8">

+<link href="index.html#Top" rel="start" title="Top">

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

+<link href="index.html#Top" rel="up" title="Top">

+<link href="Frame-Annotations.html#Frame-Annotations" rel="next" title="Frame Annotations">

+<link href="Server-Prefix.html#Server-Prefix" rel="previous" title="Server Prefix">

+<style type="text/css">

+<!--

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+span.nocodebreak {white-space:nowrap}

+span.nolinebreak {white-space:nowrap}

+span.roman {font-family:serif; font-weight:normal}

+span.sansserif {font-family:sans-serif; font-weight:normal}

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+-->

+</style>

+</head>

+<body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000">

+<a name="Value-Annotations"></a>

+<div class="header">

+<p>

+Next: <a href="Frame-Annotations.html#Frame-Annotations" accesskey="n" rel="next">Frame Annotations</a>, Previous: <a href="Server-Prefix.html#Server-Prefix" accesskey="p" rel="previous">Server Prefix</a>, Up: <a href="index.html#Top" accesskey="u" rel="up">Top</a>   [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>]</p>

+</div>

+<hr>

+<a name="Values"></a>

+<h2 class="chapter">5 Values</h2>

+<p><em>Value Annotations have been removed. <small>GDB/MI</small> instead provides

+Variable Objects.</em>

+</p>

+<a name="index-annotations-for-values"></a>

+<p>When a value is printed in various contexts, <small>GDB</small> uses

+annotations to delimit the value from the surrounding text.

+</p>

+<a name="index-value_002dhistory_002dbegin"></a>

+<a name="index-value_002dhistory_002dvalue"></a>

+<a name="index-value_002dhistory_002dend"></a>

+<p>If a value is printed using <code>print</code> and added to the value history,

+the annotation looks like

+</p>

+<div class="smallexample">

+<pre class="smallexample">^Z^Zvalue-history-begin <var>history-number</var> <var>value-flags</var>

+<var>history-string</var>

+^Z^Zvalue-history-value

+<var>the-value</var>

+^Z^Zvalue-history-end

+</pre></div>

+<p>where <var>history-number</var> is the number it is getting in the value

+history, <var>history-string</var> is a string, such as ‘<samp>$5 = </samp>’, which

+introduces the value to the user, <var>the-value</var> is the output

+corresponding to the value itself, and <var>value-flags</var> is ‘<samp>*</samp>’ for

+a value which can be dereferenced and ‘<samp>-</samp>’ for a value which cannot.

+</p>

+<a name="index-value_002dbegin"></a>

+<a name="index-value_002dend"></a>

+<p>If the value is not added to the value history (it is an invalid float

+or it is printed with the <code>output</code> command), the annotation is similar:

+</p>

+<div class="smallexample">

+<pre class="smallexample">^Z^Zvalue-begin <var>value-flags</var>

+<var>the-value</var>

+^Z^Zvalue-end

+</pre></div>

+<a name="index-arg_002dbegin"></a>

+<a name="index-arg_002dname_002dend"></a>

+<a name="index-arg_002dvalue"></a>

+<a name="index-arg_002dend"></a>

+<p>When <small>GDB</small> prints an argument to a function (for example, in the output

+from the <code>backtrace</code> command), it annotates it as follows:

+</p>

+<div class="smallexample">

+<pre class="smallexample">^Z^Zarg-begin

+<var>argument-name</var>

+^Z^Zarg-name-end

+<var>separator-string</var>

+^Z^Zarg-value <var>value-flags</var>

+<var>the-value</var>

+^Z^Zarg-end

+</pre></div>

+<p>where <var>argument-name</var> is the name of the argument,

+<var>separator-string</var> is text which separates the name from the value

+for the user’s benefit (such as ‘<samp>=</samp>’), and <var>value-flags</var> and

+<var>the-value</var> have the same meanings as in a

+<code>value-history-begin</code> annotation.

+</p>

+<a name="index-field_002dbegin"></a>

+<a name="index-field_002dname_002dend"></a>

+<a name="index-field_002dvalue"></a>

+<a name="index-field_002dend"></a>

+<p>When printing a structure, <small>GDB</small> annotates it as follows:

+</p>

+<div class="smallexample">

+<pre class="smallexample">^Z^Zfield-begin <var>value-flags</var>

+<var>field-name</var>

+^Z^Zfield-name-end

+<var>separator-string</var>

+^Z^Zfield-value

+<var>the-value</var>

+^Z^Zfield-end

+</pre></div>

+<p>where <var>field-name</var> is the name of the field, <var>separator-string</var>

+is text which separates the name from the value for the user’s benefit

+(such as ‘<samp>=</samp>’), and <var>value-flags</var> and <var>the-value</var> have the

+same meanings as in a <code>value-history-begin</code> annotation.

+</p>

+<p>When printing an array, <small>GDB</small> annotates it as follows:

+</p>

+<div class="smallexample">

+<pre class="smallexample">^Z^Zarray-section-begin <var>array-index</var> <var>value-flags</var>

+</pre></div>

+<p>where <var>array-index</var> is the index of the first element being

+annotated and <var>value-flags</var> has the same meaning as in a

+<code>value-history-begin</code> annotation. This is followed by any number

+of elements, where is element can be either a single element:

+</p>

+<a name="index-elt"></a>

+<div class="smallexample">

+<pre class="smallexample">‘<samp>,</samp>’ <var>whitespace</var> ; <span class="roman">omitted for the first element</span>

+<var>the-value</var>

+^Z^Zelt

+</pre></div>

+<p>or a repeated element

+</p>

+<a name="index-elt_002drep"></a>

+<a name="index-elt_002drep_002dend"></a>

+<div class="smallexample">

+<pre class="smallexample">‘<samp>,</samp>’ <var>whitespace</var> ; <span class="roman">omitted for the first element</span>

+<var>the-value</var>

+^Z^Zelt-rep <var>number-of-repetitions</var>

+<var>repetition-string</var>

+^Z^Zelt-rep-end

+</pre></div>

+<p>In both cases, <var>the-value</var> is the output for the value of the

+element and <var>whitespace</var> can contain spaces, tabs, and newlines. In

+the repeated case, <var>number-of-repetitions</var> is the number of

+consecutive array elements which contain that value, and

+<var>repetition-string</var> is a string which is designed to convey to the

+user that repetition is being depicted.

+</p>

+<a name="index-array_002dsection_002dend"></a>

+<p>Once all the array elements have been output, the array annotation is

+ended with

+</p>

+<div class="smallexample">

+<pre class="smallexample">^Z^Zarray-section-end

+</pre></div>

+<hr>

+<div class="header">

+<p>

+</div>

+</body>

+</html>