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diff --git a/share/doc/stabs/Line-Numbers.html b/share/doc/stabs/Line-Numbers.html new file mode 100644 index 0000000..ef3b09c --- /dev/null +++ b/share/doc/stabs/Line-Numbers.html @@ -0,0 +1,103 @@ +<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> +<html> +<!-- Copyright (C) 1992-2023 Free Software Foundation, Inc. +Contributed by Cygnus Support. Written by Julia Menapace, Jim Kingdon, +and David MacKenzie. + +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". --> +<!-- Created by GNU Texinfo 5.1, http://www.gnu.org/software/texinfo/ --> +<head> +<title>STABS: Line Numbers</title> + +<meta name="description" content="STABS: Line Numbers"> +<meta name="keywords" content="STABS: Line Numbers"> +<meta name="resource-type" content="document"> +<meta name="distribution" content="global"> +<meta name="Generator" content="makeinfo"> +<meta http-equiv="Content-Type" content="text/html; charset=utf-8"> +<link href="index.html#Top" rel="start" title="Top"> +<link href="Symbol-Types-Index.html#Symbol-Types-Index" rel="index" title="Symbol Types Index"> +<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents"> +<link href="Program-Structure.html#Program-Structure" rel="up" title="Program Structure"> +<link href="Procedures.html#Procedures" rel="next" title="Procedures"> +<link href="Include-Files.html#Include-Files" rel="previous" title="Include Files"> +<style type="text/css"> +<!-- +a.summary-letter {text-decoration: none} +blockquote.smallquotation {font-size: smaller} +div.display {margin-left: 3.2em} +div.example {margin-left: 3.2em} +div.indentedblock {margin-left: 3.2em} +div.lisp {margin-left: 3.2em} +div.smalldisplay {margin-left: 3.2em} +div.smallexample {margin-left: 3.2em} +div.smallindentedblock {margin-left: 3.2em; font-size: smaller} +div.smalllisp {margin-left: 3.2em} +kbd {font-style:oblique} +pre.display {font-family: inherit} +pre.format {font-family: inherit} +pre.menu-comment {font-family: serif} +pre.menu-preformatted {font-family: serif} +pre.smalldisplay {font-family: inherit; font-size: smaller} +pre.smallexample {font-size: smaller} +pre.smallformat {font-family: inherit; font-size: smaller} +pre.smalllisp {font-size: smaller} +span.nocodebreak {white-space:nowrap} +span.nolinebreak {white-space:nowrap} +span.roman {font-family:serif; font-weight:normal} +span.sansserif {font-family:sans-serif; font-weight:normal} +ul.no-bullet {list-style: none} +--> +</style> + + +</head> + +<body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000"> +<a name="Line-Numbers"></a> +<div class="header"> +<p> +Next: <a href="Procedures.html#Procedures" accesskey="n" rel="next">Procedures</a>, Previous: <a href="Include-Files.html#Include-Files" accesskey="p" rel="previous">Include Files</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> +</div> +<hr> +<a name="Line-Numbers-1"></a> +<h3 class="section">2.4 Line Numbers</h3> + +<a name="index-N_005fSLINE"></a> +<p>An <code>N_SLINE</code> symbol represents the start of a source line. The +desc field contains the line number and the value contains the code +address for the start of that source line. On most machines the address +is absolute; for stabs in sections (see <a href="Stab-Sections.html#Stab-Sections">Stab Sections</a>), it is +relative to the function in which the <code>N_SLINE</code> symbol occurs. +</p> +<a name="index-N_005fDSLINE"></a> +<a name="index-N_005fBSLINE"></a> +<p>GNU documents <code>N_DSLINE</code> and <code>N_BSLINE</code> symbols for line +numbers in the data or bss segments, respectively. They are identical +to <code>N_SLINE</code> but are relocated differently by the linker. They +were intended to be used to describe the source location of a variable +declaration, but I believe that GCC2 actually puts the line number in +the desc field of the stab for the variable itself. GDB has been +ignoring these symbols (unless they contain a string field) since +at least GDB 3.5. +</p> +<p>For single source lines that generate discontiguous code, such as flow +of control statements, there may be more than one line number entry for +the same source line. In this case there is a line number entry at the +start of each code range, each with the same line number. +</p> +<p>XCOFF does not use stabs for line numbers. Instead, it uses COFF line +numbers (which are outside the scope of this document). Standard COFF +line numbers cannot deal with include files, but in XCOFF this is fixed +with the <code>C_BINCL</code> method of marking include files (see <a href="Include-Files.html#Include-Files">Include Files</a>). +</p> + + + +</body> +</html> |