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154 lines
6.5 KiB
HTML
154 lines
6.5 KiB
HTML
4 years ago
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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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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<!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>Source Files (STABS)</title>
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<meta name="description" content="Source Files (STABS)">
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<meta name="keywords" content="Source Files (STABS)">
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<meta name="resource-type" content="document">
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<meta name="distribution" content="global">
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<meta name="Generator" content="makeinfo">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<link href="index.html#Top" rel="start" title="Top">
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<link href="Symbol-Types-Index.html#Symbol-Types-Index" rel="index" title="Symbol Types Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="Program-Structure.html#Program-Structure" rel="up" title="Program Structure">
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<link href="Include-Files.html#Include-Files" rel="next" title="Include Files">
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<link href="Main-Program.html#Main-Program" rel="prev" title="Main Program">
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<style type="text/css">
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<!--
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a.summary-letter {text-decoration: none}
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blockquote.indentedblock {margin-right: 0em}
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blockquote.smallindentedblock {margin-right: 0em; font-size: smaller}
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blockquote.smallquotation {font-size: smaller}
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div.display {margin-left: 3.2em}
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div.example {margin-left: 3.2em}
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div.lisp {margin-left: 3.2em}
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div.smalldisplay {margin-left: 3.2em}
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div.smallexample {margin-left: 3.2em}
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div.smalllisp {margin-left: 3.2em}
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kbd {font-style: oblique}
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pre.display {font-family: inherit}
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pre.format {font-family: inherit}
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pre.menu-comment {font-family: serif}
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pre.menu-preformatted {font-family: serif}
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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.smallformat {font-family: inherit; font-size: smaller}
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pre.smalllisp {font-size: smaller}
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span.nolinebreak {white-space: nowrap}
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span.roman {font-family: initial; font-weight: normal}
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span.sansserif {font-family: sans-serif; font-weight: normal}
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ul.no-bullet {list-style: none}
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-->
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</style>
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</head>
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<body lang="en">
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<a name="Source-Files"></a>
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<div class="header">
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<p>
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Next: <a href="Include-Files.html#Include-Files" accesskey="n" rel="next">Include Files</a>, Previous: <a href="Main-Program.html#Main-Program" accesskey="p" rel="prev">Main Program</a>, Up: <a href="Program-Structure.html#Program-Structure" accesskey="u" rel="up">Program Structure</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Symbol-Types-Index.html#Symbol-Types-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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<hr>
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<a name="Paths-and-Names-of-the-Source-Files"></a>
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<h3 class="section">2.2 Paths and Names of the Source Files</h3>
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<a name="index-N_005fSO"></a>
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<p>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>
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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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</p>
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<dl compact="compact">
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<dt><code>N_SO_AS</code> (0x1)</dt>
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<dd><p>Assembly language
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</p></dd>
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<dt><code>N_SO_C</code> (0x2)</dt>
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<dd><p>K&R traditional C
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</p></dd>
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<dt><code>N_SO_ANSI_C</code> (0x3)</dt>
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<dd><p>ANSI C
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</p></dd>
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<dt><code>N_SO_CC</code> (0x4)</dt>
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<dd><p>C++
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</p></dd>
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<dt><code>N_SO_FORTRAN</code> (0x5)</dt>
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<dd><p>Fortran
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</p></dd>
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<dt><code>N_SO_PASCAL</code> (0x6)</dt>
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<dd><p>Pascal
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</p></dd>
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<dt><code>N_SO_FORTRAN90</code> (0x7)</dt>
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<dd><p>Fortran90
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</p></dd>
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<dt><code>N_SO_OBJC</code> (0x32)</dt>
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<dd><p>Objective-C
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</p></dd>
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<dt><code>N_SO_OBJCPLUS</code> (0x33)</dt>
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<dd><p>Objective-C++
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</p></dd>
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</dl>
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<p>Some compilers (for example, GCC2 and SunOS4 <samp>/bin/cc</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>
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<p>For example:
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</p>
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<div class="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></div>
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<a name="index-C_005fFILE"></a>
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<p>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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</p>
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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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</p>
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<hr>
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<div class="header">
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<p>
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Next: <a href="Include-Files.html#Include-Files" accesskey="n" rel="next">Include Files</a>, Previous: <a href="Main-Program.html#Main-Program" accesskey="p" rel="prev">Main Program</a>, Up: <a href="Program-Structure.html#Program-Structure" accesskey="u" rel="up">Program Structure</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Symbol-Types-Index.html#Symbol-Types-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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</body>
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</html>
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