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<title>Macros and Functions - GNU Compiler Collection (GCC) Internals</title>
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(a) The FSF's Front-Cover Text is:
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A GNU Manual
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<a name="Macros-and-Functions"></a>
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<p>
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Next: <a rel="next" accesskey="n" href="Identifiers.html#Identifiers">Identifiers</a>,
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Up: <a rel="up" accesskey="u" href="Tree-overview.html#Tree-overview">Tree overview</a>
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</div>
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<h4 class="subsection">10.2.1 Trees</h4>
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<p><a name="index-tree-1715"></a><a name="index-TREE_005fCHAIN-1716"></a><a name="index-TREE_005fTYPE-1717"></a>
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All GENERIC trees have two fields in common. First, <code>TREE_CHAIN</code>
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is a pointer that can be used as a singly-linked list to other trees.
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The other is <code>TREE_TYPE</code>. Many trees store the type of an
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expression or declaration in this field.
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<p>These are some other functions for handling trees:
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<dl>
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<dt><code>tree_size</code><a name="index-tree_005fsize-1718"></a><dd>Return the number of bytes a tree takes.
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<br><dt><code>build0</code><a name="index-build0-1719"></a><dt><code>build1</code><a name="index-build1-1720"></a><dt><code>build2</code><a name="index-build2-1721"></a><dt><code>build3</code><a name="index-build3-1722"></a><dt><code>build4</code><a name="index-build4-1723"></a><dt><code>build5</code><a name="index-build5-1724"></a><dt><code>build6</code><a name="index-build6-1725"></a><dd>
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These functions build a tree and supply values to put in each
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parameter. The basic signature is ‘<samp><span class="samp">code, type, [operands]<!-- /@w --></span></samp>’.
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<code>code</code> is the <code>TREE_CODE</code>, and <code>type</code> is a tree
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representing the <code>TREE_TYPE</code>. These are followed by the
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operands, each of which is also a tree.
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</dl>
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