72 lines
3.2 KiB
HTML
72 lines
3.2 KiB
HTML
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<html lang="en">
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<head>
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<title>Set - Using as</title>
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<meta name="description" content="Using as">
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<link rel="up" href="Pseudo-Ops.html#Pseudo-Ops" title="Pseudo Ops">
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<link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage">
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<!--
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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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</head>
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<body>
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<div class="node">
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<a name="Set"></a>
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<p>
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Next: <a rel="next" accesskey="n" href="Short.html#Short">Short</a>,
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Previous: <a rel="previous" accesskey="p" href="Section.html#Section">Section</a>,
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Up: <a rel="up" accesskey="u" href="Pseudo-Ops.html#Pseudo-Ops">Pseudo Ops</a>
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<hr>
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</div>
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<h3 class="section">7.83 <code>.set </code><var>symbol</var><code>, </code><var>expression</var></h3>
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<p><a name="index-g_t_0040code_007bset_007d-directive-465"></a><a name="index-symbol-value_002c-setting-466"></a>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>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>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>On Z80 <code>set</code> is a real instruction, use
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‘<samp><var>symbol</var><span class="samp"> defl </span><var>expression</var></samp>’ instead.
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</body></html>
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