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134 lines
4.9 KiB
HTML
134 lines
4.9 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>Macro define and undefine (STABS)</title>
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<meta name="description" content="Macro define and undefine (STABS)">
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<meta name="keywords" content="Macro define and undefine (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="index.html#Top" rel="up" title="Top">
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<link href="Symbol-Tables.html#Symbol-Tables" rel="next" title="Symbol Tables">
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<link href="Function-Types.html#Function-Types" rel="prev" title="Function Types">
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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="Macro-define-and-undefine"></a>
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<div class="header">
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<p>
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Next: <a href="Symbol-Tables.html#Symbol-Tables" accesskey="n" rel="next">Symbol Tables</a>, Previous: <a href="Types.html#Types" accesskey="p" rel="prev">Types</a>, Up: <a href="index.html#Top" accesskey="u" rel="up">Top</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="Representation-of-_0023define-and-_0023undef"></a>
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<h2 class="chapter">6 Representation of #define and #undef</h2>
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<p>This section describes the stabs support for macro define and undefine
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information, supported on some systems. (e.g., with <samp>-g3</samp>
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<samp>-gstabs</samp> when using GCC).
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</p>
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<p>A <code>#define <var>macro-name</var> <var>macro-body</var></code> is represented with
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an <code>N_MAC_DEFINE</code> stab with a string field of
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<code><var>macro-name</var> <var>macro-body</var></code>.
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<a name="index-N_005fMAC_005fDEFINE"></a>
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</p>
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<p>An <code>#undef <var>macro-name</var></code> is represented with an
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<code>N_MAC_UNDEF</code> stabs with a string field of simply
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<code><var>macro-name</var></code>.
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<a name="index-N_005fMAC_005fUNDEF"></a>
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</p>
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<p>For both <code>N_MAC_DEFINE</code> and <code>N_MAC_UNDEF</code>, the desc field is
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the line number within the file where the corresponding <code>#define</code>
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or <code>#undef</code> occurred.
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</p>
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<p>For example, the following C code:
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</p>
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<div class="example">
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<pre class="example"> #define NONE 42
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#define TWO(a, b) (a + (a) + 2 * b)
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#define ONE(c) (c + 19)
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main(int argc, char *argv[])
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{
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func(NONE, TWO(10, 11));
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func(NONE, ONE(23));
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#undef ONE
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#define ONE(c) (c + 23)
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func(NONE, ONE(-23));
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return (0);
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}
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int global;
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func(int arg1, int arg2)
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{
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global = arg1 + arg2;
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}
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</pre></div>
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<p>produces the following stabs (as well as many others):
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</p>
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<div class="example">
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<pre class="example"> .stabs "NONE 42",54,0,1,0
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.stabs "TWO(a,b) (a + (a) + 2 * b)",54,0,2,0
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.stabs "ONE(c) (c + 19)",54,0,3,0
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.stabs "ONE",58,0,10,0
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.stabs "ONE(c) (c + 23)",54,0,11,0
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</pre></div>
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<p>NOTE: In the above example, <code>54</code> is <code>N_MAC_DEFINE</code> and
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<code>58</code> is <code>N_MAC_UNDEF</code>.
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</p>
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</body>
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</html>
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