| <html lang="en"> |
| <head> |
| <title>Input Files - Using as</title> |
| <meta http-equiv="Content-Type" content="text/html"> |
| <meta name="description" content="Using as"> |
| <meta name="generator" content="makeinfo 4.13"> |
| <link title="Top" rel="start" href="index.html#Top"> |
| <link rel="up" href="Overview.html#Overview" title="Overview"> |
| <link rel="prev" href="Command-Line.html#Command-Line" title="Command Line"> |
| <link rel="next" href="Object.html#Object" title="Object"> |
| <link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage"> |
| <!-- |
| This file documents the GNU Assembler "as". |
| |
| Copyright (C) 1991-2019 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 no Invariant Sections, with no Front-Cover Texts, and with no |
| Back-Cover Texts. A copy of the license is included in the |
| section entitled ``GNU Free Documentation License''. |
| |
| --> |
| <meta http-equiv="Content-Style-Type" content="text/css"> |
| <style type="text/css"><!-- |
| pre.display { font-family:inherit } |
| pre.format { font-family:inherit } |
| pre.smalldisplay { font-family:inherit; font-size:smaller } |
| pre.smallformat { font-family:inherit; font-size:smaller } |
| pre.smallexample { font-size:smaller } |
| pre.smalllisp { font-size:smaller } |
| span.sc { font-variant:small-caps } |
| span.roman { font-family:serif; font-weight:normal; } |
| span.sansserif { font-family:sans-serif; font-weight:normal; } |
| --></style> |
| </head> |
| <body> |
| <div class="node"> |
| <a name="Input-Files"></a> |
| <p> |
| Next: <a rel="next" accesskey="n" href="Object.html#Object">Object</a>, |
| Previous: <a rel="previous" accesskey="p" href="Command-Line.html#Command-Line">Command Line</a>, |
| Up: <a rel="up" accesskey="u" href="Overview.html#Overview">Overview</a> |
| <hr> |
| </div> |
| |
| <h3 class="section">1.5 Input Files</h3> |
| |
| <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 |
| describe the program input to one run of <samp><span class="command">as</span></samp>. The program may |
| be in one or more files; how the source is partitioned into files |
| doesn't change the meaning of the source. |
| |
| <!-- I added "con" prefix to "catenation" just to prove I can overcome my --> |
| <!-- APL training... doc@cygnus.com --> |
| <p>The source program is a concatenation of the text in all the files, in the |
| order specified. |
| |
| <!-- man begin DESCRIPTION --> |
| <p>Each time you run <samp><span class="command">as</span></samp> it assembles exactly one source |
| program. The source program is made up of one or more files. |
| (The standard input is also a file.) |
| |
| <p>You give <samp><span class="command">as</span></samp> a command line that has zero or more input file |
| names. The input files are read (from left file name to right). A |
| command-line argument (in any position) that has no special meaning |
| is taken to be an input file name. |
| |
| <p>If you give <samp><span class="command">as</span></samp> no file names it attempts to read one input file |
| from the <samp><span class="command">as</span></samp> standard input, which is normally your terminal. You |
| may have to type <ctl-D> to tell <samp><span class="command">as</span></samp> there is no more program |
| to assemble. |
| |
| <p>Use ‘<samp><span class="samp">--</span></samp>’ if you need to explicitly name the standard input file |
| in your command line. |
| |
| <p>If the source is empty, <samp><span class="command">as</span></samp> produces a small, empty object |
| file. |
| |
| <!-- man end --> |
| <h4 class="subheading">Filenames and Line-numbers</h4> |
| |
| <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 |
| either may be used in reporting error messages. One way refers to a line |
| number in a physical file; the other refers to a line number in a |
| “logical” file. See <a href="Errors.html#Errors">Error and Warning Messages</a>. |
| |
| <p><dfn>Physical files</dfn> are those files named in the command line given |
| to <samp><span class="command">as</span></samp>. |
| |
| <p><dfn>Logical files</dfn> are simply names declared explicitly by assembler |
| directives; they bear no relation to physical files. Logical file names help |
| error messages reflect the original source file, when <samp><span class="command">as</span></samp> source |
| is itself synthesized from other files. <samp><span class="command">as</span></samp> understands the |
| ‘<samp><span class="samp">#</span></samp>’ directives emitted by the <code>gcc</code> preprocessor. See also |
| <a href="File.html#File"><code>.file</code></a>. |
| |
| </body></html> |
| |
