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64 lines
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<a name="Annotations"></a>
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Next: <a rel="next" accesskey="n" href="SSA-Operands.html#SSA-Operands">SSA Operands</a>,
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Up: <a rel="up" accesskey="u" href="Tree-SSA.html#Tree-SSA">Tree SSA</a>
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<h3 class="section">12.1 Annotations</h3>
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<p><a name="index-annotations-2507"></a>
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The optimizers need to associate attributes with variables during the
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optimization process. For instance, we need to know whether a
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variable has aliases. All these attributes are stored in data
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structures called annotations which are then linked to the field
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<code>ann</code> in <code>struct tree_common</code>.
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