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116 lines
5.4 KiB
HTML
116 lines
5.4 KiB
HTML
4 years ago
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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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<!-- This file documents the BFD library.
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Copyright (C) 1991-2019 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 "GNU General Public License" and "Funding
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Free Software", the Front-Cover texts being (a) (see below), and with
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the Back-Cover Texts being (b) (see below). A copy of the license is
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included in the section entitled "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 6.4, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>Hash Tables (Untitled Document)</title>
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<meta name="description" content="Hash Tables (Untitled Document)">
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<meta name="keywords" content="Hash Tables (Untitled Document)">
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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="BFD-Index.html#BFD-Index" rel="index" title="BFD Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="BFD-front-end.html#BFD-front-end" rel="up" title="BFD front end">
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<link href="Creating-and-Freeing-a-Hash-Table.html#Creating-and-Freeing-a-Hash-Table" rel="next" title="Creating and Freeing a Hash Table">
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<link href="Writing-the-symbol-table.html#Writing-the-symbol-table" rel="prev" title="Writing the symbol table">
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<style type="text/css">
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-->
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</style>
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</head>
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<body lang="en">
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<a name="Hash-Tables"></a>
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<div class="header">
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<p>
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Previous: <a href="Linker-Functions.html#Linker-Functions" accesskey="p" rel="prev">Linker Functions</a>, Up: <a href="BFD-front-end.html#BFD-front-end" accesskey="u" rel="up">BFD front end</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="BFD-Index.html#BFD-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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<hr>
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<a name="Hash-Tables-1"></a>
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<h3 class="section">2.18 Hash Tables</h3>
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<a name="index-Hash-tables"></a>
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<p>BFD provides a simple set of hash table functions. Routines
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are provided to initialize a hash table, to free a hash table,
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to look up a string in a hash table and optionally create an
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entry for it, and to traverse a hash table. There is
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currently no routine to delete an string from a hash table.
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</p>
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<p>The basic hash table does not permit any data to be stored
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with a string. However, a hash table is designed to present a
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base class from which other types of hash tables may be
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derived. These derived types may store additional information
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with the string. Hash tables were implemented in this way,
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rather than simply providing a data pointer in a hash table
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entry, because they were designed for use by the linker back
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ends. The linker may create thousands of hash table entries,
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and the overhead of allocating private data and storing and
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following pointers becomes noticeable.
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</p>
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<p>The basic hash table code is in <code>hash.c</code>.
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</p>
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<table class="menu" border="0" cellspacing="0">
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<tr><td align="left" valign="top">• <a href="Creating-and-Freeing-a-Hash-Table.html#Creating-and-Freeing-a-Hash-Table" accesskey="1">Creating and Freeing a Hash Table</a>:</td><td> </td><td align="left" valign="top">
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</td></tr>
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<tr><td align="left" valign="top">• <a href="Looking-Up-or-Entering-a-String.html#Looking-Up-or-Entering-a-String" accesskey="2">Looking Up or Entering a String</a>:</td><td> </td><td align="left" valign="top">
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</td></tr>
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<tr><td align="left" valign="top">• <a href="Traversing-a-Hash-Table.html#Traversing-a-Hash-Table" accesskey="3">Traversing a Hash Table</a>:</td><td> </td><td align="left" valign="top">
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</td></tr>
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<tr><td align="left" valign="top">• <a href="Deriving-a-New-Hash-Table-Type.html#Deriving-a-New-Hash-Table-Type" accesskey="4">Deriving a New Hash Table Type</a>:</td><td> </td><td align="left" valign="top">
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</td></tr>
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</table>
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</body>
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</html>
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