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93 lines
4.1 KiB
HTML
93 lines
4.1 KiB
HTML
4 years ago
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<html lang="en">
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<head>
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<title>Symbols - Untitled</title>
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<meta http-equiv="Content-Type" content="text/html">
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<meta name="description" content="Untitled">
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<meta name="generator" content="makeinfo 4.13">
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<link title="Top" rel="start" href="index.html#Top">
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<link rel="up" href="BFD-front-end.html#BFD-front-end" title="BFD front end">
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<link rel="prev" href="Sections.html#Sections" title="Sections">
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<link rel="next" href="Archives.html#Archives" title="Archives">
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<link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage">
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<!--
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This file documents the BFD library.
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Copyright (C) 1991-2015 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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<meta http-equiv="Content-Style-Type" content="text/css">
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<style type="text/css"><!--
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pre.display { font-family:inherit }
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pre.format { font-family:inherit }
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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.smalllisp { font-size:smaller }
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span.sc { font-variant:small-caps }
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span.roman { font-family:serif; font-weight:normal; }
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span.sansserif { font-family:sans-serif; font-weight:normal; }
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--></style>
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</head>
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<body>
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<div class="node">
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<a name="Symbols"></a>
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<p>
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Next: <a rel="next" accesskey="n" href="Archives.html#Archives">Archives</a>,
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Previous: <a rel="previous" accesskey="p" href="Sections.html#Sections">Sections</a>,
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Up: <a rel="up" accesskey="u" href="BFD-front-end.html#BFD-front-end">BFD front end</a>
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<hr>
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</div>
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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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<ul class="menu">
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<li><a accesskey="1" href="Reading-Symbols.html#Reading-Symbols">Reading Symbols</a>
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<li><a accesskey="2" href="Writing-Symbols.html#Writing-Symbols">Writing Symbols</a>
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<li><a accesskey="3" href="Mini-Symbols.html#Mini-Symbols">Mini Symbols</a>
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<li><a accesskey="4" href="typedef-asymbol.html#typedef-asymbol">typedef asymbol</a>
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<li><a accesskey="5" href="symbol-handling-functions.html#symbol-handling-functions">symbol handling functions</a>
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</ul>
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</body></html>
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