103 lines
4.8 KiB
HTML
103 lines
4.8 KiB
HTML
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<html lang="en">
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<head>
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<title>Source Files - STABS</title>
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<meta http-equiv="Content-Type" content="text/html">
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<meta name="description" content="STABS">
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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="Program-Structure.html#Program-Structure" title="Program Structure">
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<link rel="prev" href="Main-Program.html#Main-Program" title="Main Program">
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<link rel="next" href="Include-Files.html#Include-Files" title="Include Files">
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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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Copyright (C) 1992-2019 Free Software Foundation, Inc.
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Contributed by Cygnus Support. Written by Julia Menapace, Jim Kingdon,
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and David MacKenzie.
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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 no
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Invariant Sections, with no Front-Cover Texts, and with no Back-Cover
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Texts. A copy of the license is included in the section entitled ``GNU
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Free Documentation License''.-->
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<style type="text/css"><!--
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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="Source-Files"></a>
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<p>
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Next: <a rel="next" accesskey="n" href="Include-Files.html#Include-Files">Include Files</a>,
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Previous: <a rel="previous" accesskey="p" href="Main-Program.html#Main-Program">Main Program</a>,
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Up: <a rel="up" accesskey="u" href="Program-Structure.html#Program-Structure">Program Structure</a>
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<hr>
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</div>
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<h3 class="section">2.2 Paths and Names of the Source Files</h3>
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<p><a name="index-N_005fSO-2"></a>Before any other stabs occur, there must be a stab specifying the source
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file. This information is contained in a symbol of stab type
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<code>N_SO</code>; the string field contains the name of the file. The
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value of the symbol is the start address of the portion of the
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text section corresponding to that file.
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<p>Some compilers use the desc field to indicate the language of the
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source file. Sun's compilers started this usage, and the first
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constants are derived from their documentation. Languages added
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by gcc/gdb start at 0x32 to avoid conflict with languages Sun may
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add in the future. A desc field with a value 0 indicates that no
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language has been specified via this mechanism.
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<dl>
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<dt><code>N_SO_AS</code> (0x1)<dd>Assembly language
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<br><dt><code>N_SO_C</code> (0x2)<dd>K&R traditional C
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<br><dt><code>N_SO_ANSI_C</code> (0x3)<dd>ANSI C
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<br><dt><code>N_SO_CC</code> (0x4)<dd>C++
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<br><dt><code>N_SO_FORTRAN</code> (0x5)<dd>Fortran
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<br><dt><code>N_SO_PASCAL</code> (0x6)<dd>Pascal
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<br><dt><code>N_SO_FORTRAN90</code> (0x7)<dd>Fortran90
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<br><dt><code>N_SO_OBJC</code> (0x32)<dd>Objective-C
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<br><dt><code>N_SO_OBJCPLUS</code> (0x33)<dd>Objective-C++
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</dl>
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<p>Some compilers (for example, GCC2 and SunOS4 <samp><span class="file">/bin/cc</span></samp>) also
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include the directory in which the source was compiled, in a second
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<code>N_SO</code> symbol preceding the one containing the file name. This
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symbol can be distinguished by the fact that it ends in a slash. Code
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from the <code>cfront</code> C<tt>++</tt> compiler can have additional <code>N_SO</code> symbols for
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nonexistent source files after the <code>N_SO</code> for the real source file;
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these are believed to contain no useful information.
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<p>For example:
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<pre class="example"> .stabs "/cygint/s1/users/jcm/play/",100,0,0,Ltext0 # <span class="roman">100 is N_SO</span>
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.stabs "hello.c",100,0,0,Ltext0
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.text
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Ltext0:
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</pre>
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<p><a name="index-C_005fFILE-3"></a>Instead of <code>N_SO</code> symbols, XCOFF uses a <code>.file</code> assembler
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directive which assembles to a <code>C_FILE</code> symbol; explaining this in
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detail is outside the scope of this document.
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<!-- FIXME: Exactly when should the empty N_SO be used? Why? -->
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<p>If it is useful to indicate the end of a source file, this is done with
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an <code>N_SO</code> symbol with an empty string for the name. The value is
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the address of the end of the text section for the file. For some
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systems, there is no indication of the end of a source file, and you
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just need to figure it ended when you see an <code>N_SO</code> for a different
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source file, or a symbol ending in <code>.o</code> (which at least some
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linkers insert to mark the start of a new <code>.o</code> file).
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</body></html>
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