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65 lines
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65 lines
2.8 KiB
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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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This file documents the GNU Assembler "as".
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Copyright (C) 1991, 92, 93, 94, 95, 96, 97, 98, 99, 2000, 2001, 2002,
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2006, 2007 Free Software Foundation, Inc.
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<p>
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<a name="Expressions"></a>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><br>
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</div>
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<h2 class="chapter">6 Expressions</h2>
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<p><a name="index-expressions-241"></a><a name="index-addresses-242"></a><a name="index-numeric-values-243"></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 <span class="command">as</span> 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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<span class="command">as</span> 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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