huangmeng
/
Embedded_AI


			
							123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110
							<!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 5.2, http://www.gnu.org/software/texinfo/ -->
<head>
<title>STABS: Nested Procedures</title>

<meta name="description" content="STABS: Nested Procedures">
<meta name="keywords" content="STABS: Nested Procedures">
<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="Block-Structure.html#Block-Structure" rel="next" title="Block Structure">
<link href="Procedures.html#Procedures" rel="prev" title="Procedures">
<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="Nested-Procedures"></a>
<div class="header">
<p>
Next: <a href="Block-Structure.html#Block-Structure" accesskey="n" rel="next">Block Structure</a>, Previous: <a href="Procedures.html#Procedures" accesskey="p" rel="prev">Procedures</a>, Up: <a href="Program-Structure.html#Program-Structure" accesskey="u" rel="up">Program Structure</a> &nbsp; [<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="Nested-Procedures-1"></a>
<h3 class="section">2.6 Nested Procedures</h3>

<p>For any of the symbol descriptors representing procedures, after the
symbol descriptor and the type information is optionally a scope
specifier.  This consists of a comma, the name of the procedure, another
comma, and the name of the enclosing procedure.  The first name is local
to the scope specified, and seems to be redundant with the name of the
symbol (before the &lsquo;<samp>:</samp>&rsquo;).  This feature is used by GCC, and
presumably Pascal, Modula-2, etc., compilers, for nested functions.
</p>
<p>If procedures are nested more than one level deep, only the immediately
containing scope is specified.  For example, this code:
</p>
<div class="example">
<pre class="example">int
foo (int x)
{
  int bar (int y)
    {
      int baz (int z)
        {
          return x + y + z;
        }
      return baz (x + 2 * y);
    }
  return x + bar (3 * x);
}
</pre></div>

<p>produces the stabs:
</p>
<div class="example">
<pre class="example">.stabs &quot;baz:f1,baz,bar&quot;,36,0,0,_baz.15         # <span class="roman">36 is N_FUN</span>
.stabs &quot;bar:f1,bar,foo&quot;,36,0,0,_bar.12
.stabs &quot;foo:F1&quot;,36,0,0,_foo
</pre></div>


</body>
</html>