99 lines
4.6 KiB
HTML
99 lines
4.6 KiB
HTML
<html lang="en">
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<head>
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<title>Input Files - Using as</title>
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<!--
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This file documents the GNU Assembler "as".
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Copyright (C) 1991, 92, 93, 94, 95, 96, 97, 98, 99, 2000, 2001, 2002,
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2006, 2007 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 1.1
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or any later version published by the Free Software Foundation;
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with no Invariant Sections, with no Front-Cover Texts, and with no
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Back-Cover Texts. A copy of the license is included in the
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section entitled ``GNU Free Documentation License''.
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<div class="node">
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<p>
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<a name="Input-Files"></a>Next: <a rel="next" accesskey="n" href="Object.html#Object">Object</a>,
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Previous: <a rel="previous" accesskey="p" href="Command-Line.html#Command-Line">Command Line</a>,
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Up: <a rel="up" accesskey="u" href="Overview.html#Overview">Overview</a>
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<hr><br>
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</div>
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<h3 class="section">1.5 Input Files</h3>
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<p><a name="index-input-29"></a><a name="index-source-program-30"></a><a name="index-files_002c-input-31"></a>We use the phrase <dfn>source program</dfn>, abbreviated <dfn>source</dfn>, to
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describe the program input to one run of <span class="command">as</span>. The program may
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be in one or more files; how the source is partitioned into files
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doesn't change the meaning of the source.
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<!-- I added "con" prefix to "catenation" just to prove I can overcome my -->
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<!-- APL training... doc@cygnus.com -->
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<p>The source program is a concatenation of the text in all the files, in the
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order specified.
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<!-- man begin DESCRIPTION -->
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<p>Each time you run <span class="command">as</span> it assembles exactly one source
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program. The source program is made up of one or more files.
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(The standard input is also a file.)
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<p>You give <span class="command">as</span> a command line that has zero or more input file
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names. The input files are read (from left file name to right). A
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command line argument (in any position) that has no special meaning
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is taken to be an input file name.
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<p>If you give <span class="command">as</span> no file names it attempts to read one input file
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from the <span class="command">as</span> standard input, which is normally your terminal. You
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may have to type <ctl-D> to tell <span class="command">as</span> there is no more program
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to assemble.
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<p>Use <span class="samp">--</span> if you need to explicitly name the standard input file
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in your command line.
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<p>If the source is empty, <span class="command">as</span> produces a small, empty object
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file.
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<!-- man end -->
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<h4 class="subheading">Filenames and Line-numbers</h4>
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<p><a name="index-input-file-linenumbers-32"></a><a name="index-line-numbers_002c-in-input-files-33"></a>There are two ways of locating a line in the input file (or files) and
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either may be used in reporting error messages. One way refers to a line
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number in a physical file; the other refers to a line number in a
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“logical” file. See <a href="Errors.html#Errors">Error and Warning Messages</a>.
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<p><dfn>Physical files</dfn> are those files named in the command line given
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to <span class="command">as</span>.
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<p><dfn>Logical files</dfn> are simply names declared explicitly by assembler
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directives; they bear no relation to physical files. Logical file names help
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error messages reflect the original source file, when <span class="command">as</span> source
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is itself synthesized from other files. <span class="command">as</span> understands the
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<span class="samp">#</span> directives emitted by the <code>gcc</code> preprocessor. See also
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<a href="File.html#File"><code>.file</code></a>.
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</body></html>
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