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| <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>. |
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