1<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> 2<html> 3<!-- Copyright (C) 1992-2021 Free Software Foundation, Inc. 4Contributed by Cygnus Support. Written by Julia Menapace, Jim Kingdon, 5and David MacKenzie. 6 7Permission is granted to copy, distribute and/or modify this document 8under the terms of the GNU Free Documentation License, Version 1.3 or 9any later version published by the Free Software Foundation; with no 10Invariant Sections, with no Front-Cover Texts, and with no Back-Cover 11Texts. A copy of the license is included in the section entitled "GNU 12Free Documentation License". --> 13<!-- Created by GNU Texinfo 5.1, http://www.gnu.org/software/texinfo/ --> 14<head> 15<title>STABS: Based Variables</title> 16 17<meta name="description" content="STABS: Based Variables"> 18<meta name="keywords" content="STABS: Based Variables"> 19<meta name="resource-type" content="document"> 20<meta name="distribution" content="global"> 21<meta name="Generator" content="makeinfo"> 22<meta http-equiv="Content-Type" content="text/html; charset=utf-8"> 23<link href="index.html#Top" rel="start" title="Top"> 24<link href="Symbol-Types-Index.html#Symbol-Types-Index" rel="index" title="Symbol Types Index"> 25<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents"> 26<link href="Variables.html#Variables" rel="up" title="Variables"> 27<link href="Parameters.html#Parameters" rel="next" title="Parameters"> 28<link href="Statics.html#Statics" rel="previous" title="Statics"> 29<style type="text/css"> 30<!-- 31a.summary-letter {text-decoration: none} 32blockquote.smallquotation {font-size: smaller} 33div.display {margin-left: 3.2em} 34div.example {margin-left: 3.2em} 35div.indentedblock {margin-left: 3.2em} 36div.lisp {margin-left: 3.2em} 37div.smalldisplay {margin-left: 3.2em} 38div.smallexample {margin-left: 3.2em} 39div.smallindentedblock {margin-left: 3.2em; font-size: smaller} 40div.smalllisp {margin-left: 3.2em} 41kbd {font-style:oblique} 42pre.display {font-family: inherit} 43pre.format {font-family: inherit} 44pre.menu-comment {font-family: serif} 45pre.menu-preformatted {font-family: serif} 46pre.smalldisplay {font-family: inherit; font-size: smaller} 47pre.smallexample {font-size: smaller} 48pre.smallformat {font-family: inherit; font-size: smaller} 49pre.smalllisp {font-size: smaller} 50span.nocodebreak {white-space:nowrap} 51span.nolinebreak {white-space:nowrap} 52span.roman {font-family:serif; font-weight:normal} 53span.sansserif {font-family:sans-serif; font-weight:normal} 54ul.no-bullet {list-style: none} 55--> 56</style> 57 58 59</head> 60 61<body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000"> 62<a name="Based-Variables"></a> 63<div class="header"> 64<p> 65Next: <a href="Parameters.html#Parameters" accesskey="n" rel="next">Parameters</a>, Previous: <a href="Statics.html#Statics" accesskey="p" rel="previous">Statics</a>, Up: <a href="Variables.html#Variables" accesskey="u" rel="up">Variables</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> 66</div> 67<hr> 68<a name="Fortran-Based-Variables"></a> 69<h3 class="section">4.6 Fortran Based Variables</h3> 70 71<p>Fortran (at least, the Sun and SGI dialects of FORTRAN-77) has a feature 72which allows allocating arrays with <code>malloc</code>, but which avoids 73blurring the line between arrays and pointers the way that C does. In 74stabs such a variable uses the ‘<samp>b</samp>’ symbol descriptor. 75</p> 76<p>For example, the Fortran declarations 77</p> 78<div class="example"> 79<pre class="example">real foo, foo10(10), foo10_5(10,5) 80pointer (foop, foo) 81pointer (foo10p, foo10) 82pointer (foo105p, foo10_5) 83</pre></div> 84 85<p>produce the stabs 86</p> 87<div class="example"> 88<pre class="example">foo:b6 89foo10:bar3;1;10;6 90foo10_5:bar3;1;5;ar3;1;10;6 91</pre></div> 92 93<p>In this example, <code>real</code> is type 6 and type 3 is an integral type 94which is the type of the subscripts of the array (probably 95<code>integer</code>). 96</p> 97<p>The ‘<samp>b</samp>’ symbol descriptor is like ‘<samp>V</samp>’ in that it denotes a 98statically allocated symbol whose scope is local to a function; see 99See <a href="Statics.html#Statics">Statics</a>. The value of the symbol, instead of being the address 100of the variable itself, is the address of a pointer to that variable. 101So in the above example, the value of the <code>foo</code> stab is the address 102of a pointer to a real, the value of the <code>foo10</code> stab is the 103address of a pointer to a 10-element array of reals, and the value of 104the <code>foo10_5</code> stab is the address of a pointer to a 5-element array 105of 10-element arrays of reals. 106</p> 107 108 109 110</body> 111</html> 112