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98 lines
4.2 KiB
HTML
98 lines
4.2 KiB
HTML
<!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>Set (Using as)</title>
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<meta name="description" content="Set (Using as)">
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<meta name="keywords" content="Set (Using as)">
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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="Short.html#Short" rel="next" title="Short">
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<link href="Section.html#Section" rel="prev" title="Section">
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</head>
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<body lang="en">
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<a name="Set"></a>
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<div class="header">
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<p>
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Next: <a href="Short.html#Short" accesskey="n" rel="next">Short</a>, Previous: <a href="Section.html#Section" accesskey="p" rel="prev">Section</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_002eset-symbol_002c-expression"></a>
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<h3 class="section">7.83 <code>.set <var>symbol</var>, <var>expression</var></code></h3>
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<a name="index-set-directive"></a>
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<a name="index-symbol-value_002c-setting"></a>
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<p>Set the value of <var>symbol</var> to <var>expression</var>. This
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changes <var>symbol</var>’s value and type to conform to
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<var>expression</var>. If <var>symbol</var> was flagged as external, it remains
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flagged (see <a href="Symbol-Attributes.html#Symbol-Attributes">Symbol Attributes</a>).
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</p>
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<p>You may <code>.set</code> a symbol many times in the same assembly provided that the
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values given to the symbol are constants. Values that are based on expressions
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involving other symbols are allowed, but some targets may restrict this to only
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being done once per assembly. This is because those targets do not set the
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addresses of symbols at assembly time, but rather delay the assignment until a
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final link is performed. This allows the linker a chance to change the code in
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the files, changing the location of, and the relative distance between, various
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different symbols.
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</p>
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<p>If you <code>.set</code> a global symbol, the value stored in the object
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file is the last value stored into it.
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</p>
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<p>On Z80 <code>set</code> is a real instruction, use
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‘<samp><var>symbol</var> defl <var>expression</var></samp>’ instead.
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</p>
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</body>
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</html>
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