114 lines
4.9 KiB
HTML
114 lines
4.9 KiB
HTML
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<!-- Copyright (C) 1988-2016 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 or
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any later version published by the Free Software Foundation; with the
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Invariant Sections being "Funding Free Software", the Front-Cover
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Texts being (a) (see below), and with the Back-Cover Texts being (b)
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(see below). A copy of the license is included in the section entitled
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"GNU Free Documentation License".
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(a) The FSF's Front-Cover Text is:
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A GNU Manual
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(b) The FSF's Back-Cover Text is:
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You have freedom to copy and modify this GNU Manual, like GNU
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software. Copies published by the Free Software Foundation raise
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funds for GNU development. -->
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<!-- Created by GNU Texinfo 5.2, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>GNU Compiler Collection (GCC) Internals: Containers</title>
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<meta name="description" content="GNU Compiler Collection (GCC) Internals: Containers">
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<meta name="keywords" content="GNU Compiler Collection (GCC) Internals: Containers">
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<meta name="resource-type" content="document">
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<meta name="distribution" content="global">
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<meta name="Generator" content="makeinfo">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<link href="index.html#Top" rel="start" title="Top">
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<link href="Option-Index.html#Option-Index" rel="index" title="Option Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="Tree-overview.html#Tree-overview" rel="up" title="Tree overview">
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<link href="Types.html#Types" rel="next" title="Types">
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<link href="Identifiers.html#Identifiers" rel="prev" title="Identifiers">
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</style>
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</head>
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<body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000">
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<a name="Containers"></a>
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<div class="header">
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<p>
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Previous: <a href="Identifiers.html#Identifiers" accesskey="p" rel="prev">Identifiers</a>, Up: <a href="Tree-overview.html#Tree-overview" accesskey="u" rel="up">Tree overview</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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<hr>
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<a name="Containers-1"></a>
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<h4 class="subsection">10.2.3 Containers</h4>
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<a name="index-container"></a>
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<a name="index-list"></a>
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<a name="index-vector"></a>
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<a name="index-TREE_005fLIST"></a>
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<a name="index-TREE_005fVEC"></a>
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<a name="index-TREE_005fPURPOSE"></a>
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<a name="index-TREE_005fVALUE"></a>
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<a name="index-TREE_005fVEC_005fLENGTH"></a>
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<a name="index-TREE_005fVEC_005fELT"></a>
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<p>Two common container data structures can be represented directly with
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tree nodes. A <code>TREE_LIST</code> is a singly linked list containing two
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trees per node. These are the <code>TREE_PURPOSE</code> and <code>TREE_VALUE</code>
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of each node. (Often, the <code>TREE_PURPOSE</code> contains some kind of
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tag, or additional information, while the <code>TREE_VALUE</code> contains the
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majority of the payload. In other cases, the <code>TREE_PURPOSE</code> is
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simply <code>NULL_TREE</code>, while in still others both the
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<code>TREE_PURPOSE</code> and <code>TREE_VALUE</code> are of equal stature.) Given
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one <code>TREE_LIST</code> node, the next node is found by following the
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<code>TREE_CHAIN</code>. If the <code>TREE_CHAIN</code> is <code>NULL_TREE</code>, then
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you have reached the end of the list.
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</p>
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<p>A <code>TREE_VEC</code> is a simple vector. The <code>TREE_VEC_LENGTH</code> is an
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integer (not a tree) giving the number of nodes in the vector. The
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nodes themselves are accessed using the <code>TREE_VEC_ELT</code> macro, which
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takes two arguments. The first is the <code>TREE_VEC</code> in question; the
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second is an integer indicating which element in the vector is desired.
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The elements are indexed from zero.
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</p>
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</body>
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</html>
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