You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
113 lines
4.8 KiB
HTML
113 lines
4.8 KiB
HTML
4 years ago
|
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
|
||
|
|
<html>
|
||
|
|
<!-- Copyright (C) 1988-2018 Free Software Foundation, Inc.
|
||
|
|
|
||
|
|
Permission is granted to copy, distribute and/or modify this document
|
||
|
|
under the terms of the GNU Free Documentation License, Version 1.3 or
|
||
|
|
any later version published by the Free Software Foundation; with the
|
||
|
|
Invariant Sections being "Funding Free Software", the Front-Cover
|
||
|
|
Texts being (a) (see below), and with the Back-Cover Texts being (b)
|
||
|
|
(see below). A copy of the license is included in the section entitled
|
||
|
|
"GNU Free Documentation License".
|
||
|
|
|
||
|
|
(a) The FSF's Front-Cover Text is:
|
||
|
|
|
||
|
|
A GNU Manual
|
||
|
|
|
||
|
|
(b) The FSF's Back-Cover Text is:
|
||
|
|
|
||
|
|
You have freedom to copy and modify this GNU Manual, like GNU
|
||
|
|
software. Copies published by the Free Software Foundation raise
|
||
|
|
funds for GNU development. -->
|
||
|
|
<!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ -->
|
||
|
|
<head>
|
||
|
|
<title>Containers (GNU Compiler Collection (GCC) Internals)</title>
|
||
|
|
|
||
|
|
<meta name="description" content="Containers (GNU Compiler Collection (GCC) Internals)">
|
||
|
|
<meta name="keywords" content="Containers (GNU Compiler Collection (GCC) Internals)">
|
||
|
|
<meta name="resource-type" content="document">
|
||
|
|
<meta name="distribution" content="global">
|
||
|
|
<meta name="Generator" content="makeinfo">
|
||
|
|
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
|
||
|
|
<link href="index.html#Top" rel="start" title="Top">
|
||
|
|
<link href="Option-Index.html#Option-Index" rel="index" title="Option Index">
|
||
|
|
<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
|
||
|
|
<link href="Tree-overview.html#Tree-overview" rel="up" title="Tree overview">
|
||
|
|
<link href="Types.html#Types" rel="next" title="Types">
|
||
|
|
<link href="Identifiers.html#Identifiers" rel="prev" title="Identifiers">
|
||
|
|
<style type="text/css">
|
||
|
|
<!--
|
||
|
|
a.summary-letter {text-decoration: none}
|
||
|
|
blockquote.indentedblock {margin-right: 0em}
|
||
|
|
blockquote.smallindentedblock {margin-right: 0em; font-size: smaller}
|
||
|
|
blockquote.smallquotation {font-size: smaller}
|
||
|
|
div.display {margin-left: 3.2em}
|
||
|
|
div.example {margin-left: 3.2em}
|
||
|
|
div.lisp {margin-left: 3.2em}
|
||
|
|
div.smalldisplay {margin-left: 3.2em}
|
||
|
|
div.smallexample {margin-left: 3.2em}
|
||
|
|
div.smalllisp {margin-left: 3.2em}
|
||
|
|
kbd {font-style: oblique}
|
||
|
|
pre.display {font-family: inherit}
|
||
|
|
pre.format {font-family: inherit}
|
||
|
|
pre.menu-comment {font-family: serif}
|
||
|
|
pre.menu-preformatted {font-family: serif}
|
||
|
|
pre.smalldisplay {font-family: inherit; font-size: smaller}
|
||
|
|
pre.smallexample {font-size: smaller}
|
||
|
|
pre.smallformat {font-family: inherit; font-size: smaller}
|
||
|
|
pre.smalllisp {font-size: smaller}
|
||
|
|
span.nolinebreak {white-space: nowrap}
|
||
|
|
span.roman {font-family: initial; font-weight: normal}
|
||
|
|
span.sansserif {font-family: sans-serif; font-weight: normal}
|
||
|
|
ul.no-bullet {list-style: none}
|
||
|
|
-->
|
||
|
|
</style>
|
||
|
|
|
||
|
|
|
||
|
|
</head>
|
||
|
|
|
||
|
|
<body lang="en">
|
||
|
|
<a name="Containers"></a>
|
||
|
|
<div class="header">
|
||
|
|
<p>
|
||
|
|
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>
|
||
|
|
</div>
|
||
|
|
<hr>
|
||
|
|
<a name="Containers-1"></a>
|
||
|
|
<h4 class="subsection">11.2.3 Containers</h4>
|
||
|
|
<a name="index-container"></a>
|
||
|
|
<a name="index-list"></a>
|
||
|
|
<a name="index-vector"></a>
|
||
|
|
<a name="index-TREE_005fLIST"></a>
|
||
|
|
<a name="index-TREE_005fVEC"></a>
|
||
|
|
<a name="index-TREE_005fPURPOSE"></a>
|
||
|
|
<a name="index-TREE_005fVALUE"></a>
|
||
|
|
<a name="index-TREE_005fVEC_005fLENGTH"></a>
|
||
|
|
<a name="index-TREE_005fVEC_005fELT"></a>
|
||
|
|
|
||
|
|
<p>Two common container data structures can be represented directly with
|
||
|
|
tree nodes. A <code>TREE_LIST</code> is a singly linked list containing two
|
||
|
|
trees per node. These are the <code>TREE_PURPOSE</code> and <code>TREE_VALUE</code>
|
||
|
|
of each node. (Often, the <code>TREE_PURPOSE</code> contains some kind of
|
||
|
|
tag, or additional information, while the <code>TREE_VALUE</code> contains the
|
||
|
|
majority of the payload. In other cases, the <code>TREE_PURPOSE</code> is
|
||
|
|
simply <code>NULL_TREE</code>, while in still others both the
|
||
|
|
<code>TREE_PURPOSE</code> and <code>TREE_VALUE</code> are of equal stature.) Given
|
||
|
|
one <code>TREE_LIST</code> node, the next node is found by following the
|
||
|
|
<code>TREE_CHAIN</code>. If the <code>TREE_CHAIN</code> is <code>NULL_TREE</code>, then
|
||
|
|
you have reached the end of the list.
|
||
|
|
</p>
|
||
|
|
<p>A <code>TREE_VEC</code> is a simple vector. The <code>TREE_VEC_LENGTH</code> is an
|
||
|
|
integer (not a tree) giving the number of nodes in the vector. The
|
||
|
|
nodes themselves are accessed using the <code>TREE_VEC_ELT</code> macro, which
|
||
|
|
takes two arguments. The first is the <code>TREE_VEC</code> in question; the
|
||
|
|
second is an integer indicating which element in the vector is desired.
|
||
|
|
The elements are indexed from zero.
|
||
|
|
</p>
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
</body>
|
||
|
|
</html>
|