66 lines
2.8 KiB
HTML
66 lines
2.8 KiB
HTML
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<html lang="en">
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<head>
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<title>Expressions - Using as</title>
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<meta name="description" content="Using as">
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<meta name="generator" content="makeinfo 4.13">
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<link title="Top" rel="start" href="index.html#Top">
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<link rel="prev" href="Symbols.html#Symbols" title="Symbols">
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<link rel="next" 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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<style type="text/css"><!--
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--></style>
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</head>
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<body>
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<div class="node">
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<a name="Expressions"></a>
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<p>
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Next: <a rel="next" accesskey="n" href="Pseudo-Ops.html#Pseudo-Ops">Pseudo Ops</a>,
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Previous: <a rel="previous" accesskey="p" href="Symbols.html#Symbols">Symbols</a>,
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Up: <a rel="up" accesskey="u" href="index.html#Top">Top</a>
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<hr>
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</div>
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<h2 class="chapter">6 Expressions</h2>
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<p><a name="index-expressions-243"></a><a name="index-addresses-244"></a><a name="index-numeric-values-245"></a>An <dfn>expression</dfn> specifies an address or numeric value.
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Whitespace may precede and/or follow an expression.
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<p>The result of an expression must be an absolute number, or else an offset into
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a particular section. If an expression is not absolute, and there is not
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enough information when <samp><span class="command">as</span></samp> sees the expression to know its
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section, a second pass over the source program might be necessary to interpret
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the expression—but the second pass is currently not implemented.
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<samp><span class="command">as</span></samp> aborts with an error message in this situation.
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<ul class="menu">
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<li><a accesskey="1" href="Empty-Exprs.html#Empty-Exprs">Empty Exprs</a>: Empty Expressions
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<li><a accesskey="2" href="Integer-Exprs.html#Integer-Exprs">Integer Exprs</a>: Integer Expressions
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</ul>
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</body></html>
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