1<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> 2<html> 3<!-- This file documents the GNU Assembler "as". 4 5Copyright (C) 1991-2021 Free Software Foundation, Inc. 6 7Permission is granted to copy, distribute and/or modify this document 8under the terms of the GNU Free Documentation License, Version 1.3 9or any later version published by the Free Software Foundation; 10with no Invariant Sections, with no Front-Cover Texts, and with no 11Back-Cover Texts. A copy of the license is included in the 12section entitled "GNU Free Documentation License". 13 --> 14<!-- Created by GNU Texinfo 5.1, http://www.gnu.org/software/texinfo/ --> 15<head> 16<title>Using as: Weakref</title> 17 18<meta name="description" content="Using as: Weakref"> 19<meta name="keywords" content="Using as: Weakref"> 20<meta name="resource-type" content="document"> 21<meta name="distribution" content="global"> 22<meta name="Generator" content="makeinfo"> 23<meta http-equiv="Content-Type" content="text/html; charset=utf-8"> 24<link href="index.html#Top" rel="start" title="Top"> 25<link href="AS-Index.html#AS-Index" rel="index" title="AS Index"> 26<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents"> 27<link href="Pseudo-Ops.html#Pseudo-Ops" rel="up" title="Pseudo Ops"> 28<link href="Word.html#Word" rel="next" title="Word"> 29<link href="Weak.html#Weak" rel="previous" title="Weak"> 30<style type="text/css"> 31<!-- 32a.summary-letter {text-decoration: none} 33blockquote.smallquotation {font-size: smaller} 34div.display {margin-left: 3.2em} 35div.example {margin-left: 3.2em} 36div.indentedblock {margin-left: 3.2em} 37div.lisp {margin-left: 3.2em} 38div.smalldisplay {margin-left: 3.2em} 39div.smallexample {margin-left: 3.2em} 40div.smallindentedblock {margin-left: 3.2em; font-size: smaller} 41div.smalllisp {margin-left: 3.2em} 42kbd {font-style:oblique} 43pre.display {font-family: inherit} 44pre.format {font-family: inherit} 45pre.menu-comment {font-family: serif} 46pre.menu-preformatted {font-family: serif} 47pre.smalldisplay {font-family: inherit; font-size: smaller} 48pre.smallexample {font-size: smaller} 49pre.smallformat {font-family: inherit; font-size: smaller} 50pre.smalllisp {font-size: smaller} 51span.nocodebreak {white-space:nowrap} 52span.nolinebreak {white-space:nowrap} 53span.roman {font-family:serif; font-weight:normal} 54span.sansserif {font-family:sans-serif; font-weight:normal} 55ul.no-bullet {list-style: none} 56--> 57</style> 58 59 60</head> 61 62<body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000"> 63<a name="Weakref"></a> 64<div class="header"> 65<p> 66Next: <a href="Word.html#Word" accesskey="n" rel="next">Word</a>, Previous: <a href="Weak.html#Weak" accesskey="p" rel="previous">Weak</a>, Up: <a href="Pseudo-Ops.html#Pseudo-Ops" accesskey="u" rel="up">Pseudo Ops</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="AS-Index.html#AS-Index" title="Index" rel="index">Index</a>]</p> 67</div> 68<hr> 69<a name="g_t_002eweakref-alias_002c-target"></a> 70<h3 class="section">7.109 <code>.weakref <var>alias</var>, <var>target</var></code></h3> 71 72<a name="index-weakref-directive"></a> 73<p>This directive creates an alias to the target symbol that enables the symbol to 74be referenced with weak-symbol semantics, but without actually making it weak. 75If direct references or definitions of the symbol are present, then the symbol 76will not be weak, but if all references to it are through weak references, the 77symbol will be marked as weak in the symbol table. 78</p> 79<p>The effect is equivalent to moving all references to the alias to a separate 80assembly source file, renaming the alias to the symbol in it, declaring the 81symbol as weak there, and running a reloadable link to merge the object files 82resulting from the assembly of the new source file and the old source file that 83had the references to the alias removed. 84</p> 85<p>The alias itself never makes to the symbol table, and is entirely handled 86within the assembler. 87</p> 88 89 90 91</body> 92</html> 93