diff options
Diffstat (limited to 'share/doc/stabs/Constants.html')
| -rw-r--r-- | share/doc/stabs/Constants.html | 151 |
1 files changed, 151 insertions, 0 deletions
diff --git a/share/doc/stabs/Constants.html b/share/doc/stabs/Constants.html new file mode 100644 index 0000000..7cb6bdb --- /dev/null +++ b/share/doc/stabs/Constants.html @@ -0,0 +1,151 @@ +<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> +<html> +<!-- Copyright (C) 1992-2023 Free Software Foundation, Inc. +Contributed by Cygnus Support. Written by Julia Menapace, Jim Kingdon, +and David MacKenzie. + +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". --> +<!-- Created by GNU Texinfo 5.1, http://www.gnu.org/software/texinfo/ --> +<head> +<title>STABS: Constants</title> + +<meta name="description" content="STABS: Constants"> +<meta name="keywords" content="STABS: Constants"> +<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="Symbol-Types-Index.html#Symbol-Types-Index" rel="index" title="Symbol Types Index"> +<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents"> +<link href="index.html#Top" rel="up" title="Top"> +<link href="Variables.html#Variables" rel="next" title="Variables"> +<link href="Alternate-Entry-Points.html#Alternate-Entry-Points" rel="previous" title="Alternate Entry Points"> +<style type="text/css"> +<!-- +a.summary-letter {text-decoration: none} +blockquote.smallquotation {font-size: smaller} +div.display {margin-left: 3.2em} +div.example {margin-left: 3.2em} +div.indentedblock {margin-left: 3.2em} +div.lisp {margin-left: 3.2em} +div.smalldisplay {margin-left: 3.2em} +div.smallexample {margin-left: 3.2em} +div.smallindentedblock {margin-left: 3.2em; font-size: smaller} +div.smalllisp {margin-left: 3.2em} +kbd {font-style:oblique} +pre.display {font-family: inherit} +pre.format {font-family: inherit} +pre.menu-comment {font-family: serif} +pre.menu-preformatted {font-family: serif} +pre.smalldisplay {font-family: inherit; font-size: smaller} +pre.smallexample {font-size: smaller} +pre.smallformat {font-family: inherit; font-size: smaller} +pre.smalllisp {font-size: smaller} +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} +ul.no-bullet {list-style: none} +--> +</style> + + +</head> + +<body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000"> +<a name="Constants"></a> +<div class="header"> +<p> +Next: <a href="Variables.html#Variables" accesskey="n" rel="next">Variables</a>, Previous: <a href="Program-Structure.html#Program-Structure" accesskey="p" rel="previous">Program Structure</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>][<a href="Symbol-Types-Index.html#Symbol-Types-Index" title="Index" rel="index">Index</a>]</p> +</div> +<hr> +<a name="Constants-1"></a> +<h2 class="chapter">3 Constants</h2> + +<p>The ‘<samp>c</samp>’ symbol descriptor indicates that this stab represents a +constant. This symbol descriptor is an exception to the general rule +that symbol descriptors are followed by type information. Instead, it +is followed by ‘<samp>=</samp>’ and one of the following: +</p> +<dl compact="compact"> +<dt><code>b <var>value</var></code></dt> +<dd><p>Boolean constant. <var>value</var> is a numeric value; I assume it is 0 for +false or 1 for true. +</p> +</dd> +<dt><code>c <var>value</var></code></dt> +<dd><p>Character constant. <var>value</var> is the numeric value of the constant. +</p> +</dd> +<dt><code>e <var>type-information</var> , <var>value</var></code></dt> +<dd><p>Constant whose value can be represented as integral. +<var>type-information</var> is the type of the constant, as it would appear +after a symbol descriptor (see <a href="String-Field.html#String-Field">String Field</a>). <var>value</var> is the +numeric value of the constant. GDB 4.9 does not actually get the right +value if <var>value</var> does not fit in a host <code>int</code>, but it does not +do anything violent, and future debuggers could be extended to accept +integers of any size (whether unsigned or not). This constant type is +usually documented as being only for enumeration constants, but GDB has +never imposed that restriction; I don’t know about other debuggers. +</p> +</dd> +<dt><code>i <var>value</var></code></dt> +<dd><p>Integer constant. <var>value</var> is the numeric value. The type is some +sort of generic integer type (for GDB, a host <code>int</code>); to specify +the type explicitly, use ‘<samp>e</samp>’ instead. +</p> +</dd> +<dt><code>r <var>value</var></code></dt> +<dd><p>Real constant. <var>value</var> is the real value, which can be ‘<samp>INF</samp>’ +(optionally preceded by a sign) for infinity, ‘<samp>QNAN</samp>’ for a quiet +NaN (not-a-number), or ‘<samp>SNAN</samp>’ for a signalling NaN. If it is a +normal number the format is that accepted by the C library function +<code>atof</code>. +</p> +</dd> +<dt><code>s <var>string</var></code></dt> +<dd><p>String constant. <var>string</var> is a string enclosed in either ‘<samp>'</samp>’ +(in which case ‘<samp>'</samp>’ characters within the string are represented as +‘<samp>\'</samp>’ or ‘<samp>"</samp>’ (in which case ‘<samp>"</samp>’ characters within the +string are represented as ‘<samp>\"</samp>’). +</p> +</dd> +<dt><code>S <var>type-information</var> , <var>elements</var> , <var>bits</var> , <var>pattern</var></code></dt> +<dd><p>Set constant. <var>type-information</var> is the type of the constant, as it +would appear after a symbol descriptor (see <a href="String-Field.html#String-Field">String Field</a>). +<var>elements</var> is the number of elements in the set (does this means +how many bits of <var>pattern</var> are actually used, which would be +redundant with the type, or perhaps the number of bits set in +<var>pattern</var>? I don’t get it), <var>bits</var> is the number of bits in the +constant (meaning it specifies the length of <var>pattern</var>, I think), +and <var>pattern</var> is a hexadecimal representation of the set. AIX +documentation refers to a limit of 32 bytes, but I see no reason why +this limit should exist. This form could probably be used for arbitrary +constants, not just sets; the only catch is that <var>pattern</var> should be +understood to be target, not host, byte order and format. +</p></dd> +</dl> + +<p>The boolean, character, string, and set constants are not supported by +GDB 4.9, but it ignores them. GDB 4.8 and earlier gave an error +message and refused to read symbols from the file containing the +constants. +</p> +<p>The above information is followed by ‘<samp>;</samp>’. +</p> +<hr> +<div class="header"> +<p> +Next: <a href="Variables.html#Variables" accesskey="n" rel="next">Variables</a>, Previous: <a href="Program-Structure.html#Program-Structure" accesskey="p" rel="previous">Program Structure</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>][<a href="Symbol-Types-Index.html#Symbol-Types-Index" title="Index" rel="index">Index</a>]</p> +</div> + + + +</body> +</html> |