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: Reference Parameters</title> 16 17<meta name="description" content="STABS: Reference Parameters"> 18<meta name="keywords" content="STABS: Reference Parameters"> 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="Parameters.html#Parameters" rel="up" title="Parameters"> 27<link href="Conformant-Arrays.html#Conformant-Arrays" rel="next" title="Conformant Arrays"> 28<link href="Local-Variable-Parameters.html#Local-Variable-Parameters" rel="previous" title="Local Variable Parameters"> 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="Reference-Parameters"></a> 63<div class="header"> 64<p> 65Next: <a href="Conformant-Arrays.html#Conformant-Arrays" accesskey="n" rel="next">Conformant Arrays</a>, Previous: <a href="Local-Variable-Parameters.html#Local-Variable-Parameters" accesskey="p" rel="previous">Local Variable Parameters</a>, Up: <a href="Parameters.html#Parameters" accesskey="u" rel="up">Parameters</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="Passing-Parameters-by-Reference"></a> 69<h4 class="subsection">4.7.3 Passing Parameters by Reference</h4> 70 71<p>If the parameter is passed by reference (e.g., Pascal <code>VAR</code> 72parameters), then the symbol descriptor is ‘<samp>v</samp>’ if it is in the 73argument list, or ‘<samp>a</samp>’ if it in a register. Other than the fact 74that these contain the address of the parameter rather than the 75parameter itself, they are identical to ‘<samp>p</samp>’ and ‘<samp>R</samp>’, 76respectively. I believe ‘<samp>a</samp>’ is an AIX invention; ‘<samp>v</samp>’ is 77supported by all stabs-using systems as far as I know. 78</p> 79 80 81 82</body> 83</html> 84