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126 lines
6.2 KiB
HTML
126 lines
6.2 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>Symbols (Untitled Document)</title>
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<meta name="description" content="Symbols (Untitled Document)">
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<meta name="keywords" content="Symbols (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="Reading-Symbols.html#Reading-Symbols" rel="next" title="Reading Symbols">
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<link href="section-prototypes.html#section-prototypes" rel="prev" title="section prototypes">
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<style type="text/css">
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<!--
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a.summary-letter {text-decoration: none}
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div.display {margin-left: 3.2em}
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div.example {margin-left: 3.2em}
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kbd {font-style: oblique}
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pre.display {font-family: inherit}
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pre.format {font-family: inherit}
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pre.menu-comment {font-family: serif}
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pre.menu-preformatted {font-family: serif}
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pre.smalldisplay {font-family: inherit; font-size: smaller}
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pre.smallexample {font-size: smaller}
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pre.smallformat {font-family: inherit; font-size: smaller}
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pre.smalllisp {font-size: smaller}
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span.nolinebreak {white-space: nowrap}
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span.roman {font-family: initial; font-weight: normal}
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span.sansserif {font-family: sans-serif; font-weight: normal}
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ul.no-bullet {list-style: none}
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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="Symbols"></a>
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<div class="header">
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<p>
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Next: <a href="Archives.html#Archives" accesskey="n" rel="next">Archives</a>, Previous: <a href="Sections.html#Sections" accesskey="p" rel="prev">Sections</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="Symbols-1"></a>
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<h3 class="section">2.7 Symbols</h3>
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<p>BFD tries to maintain as much symbol information as it can when
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it moves information from file to file. BFD passes information
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to applications though the <code>asymbol</code> structure. When the
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application requests the symbol table, BFD reads the table in
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the native form and translates parts of it into the internal
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format. To maintain more than the information passed to
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applications, some targets keep some information “behind the
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scenes” in a structure only the particular back end knows
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about. For example, the coff back end keeps the original
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symbol table structure as well as the canonical structure when
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a BFD is read in. On output, the coff back end can reconstruct
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the output symbol table so that no information is lost, even
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information unique to coff which BFD doesn’t know or
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understand. If a coff symbol table were read, but were written
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through an a.out back end, all the coff specific information
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would be lost. The symbol table of a BFD
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is not necessarily read in until a canonicalize request is
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made. Then the BFD back end fills in a table provided by the
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application with pointers to the canonical information. To
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output symbols, the application provides BFD with a table of
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pointers to pointers to <code>asymbol</code>s. This allows applications
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like the linker to output a symbol as it was read, since the “behind
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the scenes” information will be still available.
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</p><table class="menu" border="0" cellspacing="0">
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<tr><td align="left" valign="top">• <a href="Reading-Symbols.html#Reading-Symbols" accesskey="1">Reading Symbols</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="Writing-Symbols.html#Writing-Symbols" accesskey="2">Writing Symbols</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="Mini-Symbols.html#Mini-Symbols" accesskey="3">Mini Symbols</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="typedef-asymbol.html#typedef-asymbol" accesskey="4">typedef asymbol</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="symbol-handling-functions.html#symbol-handling-functions" accesskey="5">symbol handling functions</a>:</td><td> </td><td align="left" valign="top">
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</td></tr>
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</table>
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<hr>
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<div class="header">
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<p>
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Next: <a href="Archives.html#Archives" accesskey="n" rel="next">Archives</a>, Previous: <a href="Sections.html#Sections" accesskey="p" rel="prev">Sections</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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</body>
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</html>
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