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92 lines
3.8 KiB
HTML
92 lines
3.8 KiB
HTML
4 years ago
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<!-- This file documents the GNU Assembler "as".
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Copyright (C) 1991-2019 Free Software Foundation, Inc.
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Permission is granted to copy, distribute and/or modify this document
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under the terms of the GNU Free Documentation License, Version 1.3
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or any later version published by the Free Software Foundation;
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with no Invariant Sections, with no Front-Cover Texts, and with no
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Back-Cover Texts. A copy of the license is included in the
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section entitled "GNU Free Documentation License".
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-->
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<!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>Weakref (Using as)</title>
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<meta name="description" content="Weakref (Using as)">
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<meta name="keywords" content="Weakref (Using as)">
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<meta name="resource-type" content="document">
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<meta name="distribution" content="global">
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<meta name="Generator" content="makeinfo">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<link href="index.html#Top" rel="start" title="Top">
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<link href="AS-Index.html#AS-Index" rel="index" title="AS Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="Pseudo-Ops.html#Pseudo-Ops" rel="up" title="Pseudo Ops">
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<link href="Word.html#Word" rel="next" title="Word">
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<link href="Weak.html#Weak" rel="prev" title="Weak">
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<style type="text/css">
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<!--
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a.summary-letter {text-decoration: none}
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pre.menu-comment {font-family: serif}
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span.nolinebreak {white-space: nowrap}
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span.roman {font-family: initial; font-weight: normal}
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span.sansserif {font-family: sans-serif; font-weight: normal}
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ul.no-bullet {list-style: none}
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-->
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</style>
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</head>
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<body lang="en">
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<a name="Weakref"></a>
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<div class="header">
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<p>
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Next: <a href="Word.html#Word" accesskey="n" rel="next">Word</a>, Previous: <a href="Weak.html#Weak" accesskey="p" rel="prev">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>
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</div>
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<hr>
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<a name="g_t_002eweakref-alias_002c-target"></a>
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<h3 class="section">7.106 <code>.weakref <var>alias</var>, <var>target</var></code></h3>
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<a name="index-weakref-directive"></a>
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<p>This directive creates an alias to the target symbol that enables the symbol to
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be referenced with weak-symbol semantics, but without actually making it weak.
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If direct references or definitions of the symbol are present, then the symbol
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will not be weak, but if all references to it are through weak references, the
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symbol will be marked as weak in the symbol table.
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</p>
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<p>The effect is equivalent to moving all references to the alias to a separate
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assembly source file, renaming the alias to the symbol in it, declaring the
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symbol as weak there, and running a reloadable link to merge the object files
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resulting from the assembly of the new source file and the old source file that
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had the references to the alias removed.
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</p>
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<p>The alias itself never makes to the symbol table, and is entirely handled
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within the assembler.
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</p>
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</body>
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</html>
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