<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <!-- Copyright (C) 1992-2019 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 6.4, http://www.gnu.org/software/texinfo/ --> <head> <title>Stab Section Transformations (STABS)</title> <meta name="description" content="Stab Section Transformations (STABS)"> <meta name="keywords" content="Stab Section Transformations (STABS)"> <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="Transformations-On-Symbol-Tables.html#Transformations-On-Symbol-Tables" rel="up" title="Transformations On Symbol Tables"> <link href="Cplusplus.html#Cplusplus" rel="next" title="Cplusplus"> <link href="Transformations-On-Global-Variables.html#Transformations-On-Global-Variables" rel="prev" title="Transformations On Global Variables"> <style type="text/css"> <!-- a.summary-letter {text-decoration: none} blockquote.indentedblock {margin-right: 0em} blockquote.smallindentedblock {margin-right: 0em; font-size: smaller} blockquote.smallquotation {font-size: smaller} div.display {margin-left: 3.2em} div.example {margin-left: 3.2em} div.lisp {margin-left: 3.2em} div.smalldisplay {margin-left: 3.2em} div.smallexample {margin-left: 3.2em} 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.nolinebreak {white-space: nowrap} span.roman {font-family: initial; font-weight: normal} span.sansserif {font-family: sans-serif; font-weight: normal} ul.no-bullet {list-style: none} --> </style> </head> <body lang="en"> <a name="Stab-Section-Transformations"></a> <div class="header"> <p> Previous: <a href="Transformations-On-Global-Variables.html#Transformations-On-Global-Variables" accesskey="p" rel="prev">Transformations On Global Variables</a>, Up: <a href="Transformations-On-Symbol-Tables.html#Transformations-On-Symbol-Tables" accesskey="u" rel="up">Transformations On Symbol Tables</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="Transformations-of-Stabs-in-separate-sections"></a> <h4 class="subsection">7.2.3 Transformations of Stabs in separate sections</h4> <p>For object file formats using stabs in separate sections (see <a href="Stab-Sections.html#Stab-Sections">Stab Sections</a>), use <code>objdump --stabs</code> instead of <code>nm</code> to show the stabs in an object or executable file. <code>objdump</code> is a GNU utility; Sun does not provide any equivalent. </p> <p>The following example is for a stab whose value is an address is relative to the compilation unit (see <a href="ELF-Linker-Relocation.html#ELF-Linker-Relocation">ELF Linker Relocation</a>). For example, if the source line </p> <div class="example"> <pre class="example">static int ld = 5; </pre></div> <p>appears within a function, then the assembly language output from the compiler contains: </p> <div class="example"> <pre class="example">.Ddata.data: … .stabs "ld:V(0,3)",0x26,0,4,.L18-Ddata.data # <span class="roman">0x26 is N_STSYM</span> … .L18: .align 4 .word 0x5 </pre></div> <p>Because the value is formed by subtracting one symbol from another, the value is absolute, not relocatable, and so the object file contains </p> <div class="example"> <pre class="example">Symnum n_type n_othr n_desc n_value n_strx String 31 STSYM 0 4 00000004 680 ld:V(0,3) </pre></div> <p>without any relocations, and the executable file also contains </p> <div class="example"> <pre class="example">Symnum n_type n_othr n_desc n_value n_strx String 31 STSYM 0 4 00000004 680 ld:V(0,3) </pre></div> </body> </html>