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| author | alk3pInjection <webmaster@raspii.tech> | 2024-02-04 16:16:35 +0800 |
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| committer | alk3pInjection <webmaster@raspii.tech> | 2024-02-04 16:16:35 +0800 |
| commit | abdaadbcae30fe0c9a66c7516798279fdfd97750 (patch) | |
| tree | 00a54a6e25601e43876d03c1a4a12a749d4a914c /share/doc/stabs/Macro-define-and-undefine.html | |
https://developer.arm.com/downloads/-/arm-gnu-toolchain-downloads
Change-Id: I7303388733328cd98ab9aa3c30236db67f2e9e9c
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diff --git a/share/doc/stabs/Macro-define-and-undefine.html b/share/doc/stabs/Macro-define-and-undefine.html new file mode 100644 index 0000000..7636cc7 --- /dev/null +++ b/share/doc/stabs/Macro-define-and-undefine.html @@ -0,0 +1,134 @@ +<!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: Macro define and undefine</title> + +<meta name="description" content="STABS: Macro define and undefine"> +<meta name="keywords" content="STABS: Macro define and undefine"> +<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="index.html#Top" rel="up" title="Top"> +<link href="Symbol-Tables.html#Symbol-Tables" rel="next" title="Symbol Tables"> +<link href="Function-Types.html#Function-Types" rel="previous" title="Function Types"> +<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="Macro-define-and-undefine"></a> +<div class="header"> +<p> +Next: <a href="Symbol-Tables.html#Symbol-Tables" accesskey="n" rel="next">Symbol Tables</a>, Previous: <a href="Types.html#Types" accesskey="p" rel="previous">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> +</div> +<hr> +<a name="Representation-of-_0023define-and-_0023undef"></a> +<h2 class="chapter">6 Representation of #define and #undef</h2> + +<p>This section describes the stabs support for macro define and undefine +information, supported on some systems. (e.g., with <samp>-g3</samp> +<samp>-gstabs</samp> when using GCC). +</p> +<p>A <code>#define <var>macro-name</var> <var>macro-body</var></code> is represented with +an <code>N_MAC_DEFINE</code> stab with a string field of +<code><var>macro-name</var> <var>macro-body</var></code>. +<a name="index-N_005fMAC_005fDEFINE"></a> +</p> +<p>An <code>#undef <var>macro-name</var></code> is represented with an +<code>N_MAC_UNDEF</code> stabs with a string field of simply +<code><var>macro-name</var></code>. +<a name="index-N_005fMAC_005fUNDEF"></a> +</p> +<p>For both <code>N_MAC_DEFINE</code> and <code>N_MAC_UNDEF</code>, the desc field is +the line number within the file where the corresponding <code>#define</code> +or <code>#undef</code> occurred. +</p> +<p>For example, the following C code: +</p> +<div class="example"> +<pre class="example"> #define NONE 42 + #define TWO(a, b) (a + (a) + 2 * b) + #define ONE(c) (c + 19) + + main(int argc, char *argv[]) + { + func(NONE, TWO(10, 11)); + func(NONE, ONE(23)); + + #undef ONE + #define ONE(c) (c + 23) + + func(NONE, ONE(-23)); + + return (0); + } + + int global; + + func(int arg1, int arg2) + { + global = arg1 + arg2; + } +</pre></div> + +<p>produces the following stabs (as well as many others): +</p> +<div class="example"> +<pre class="example"> .stabs "NONE 42",54,0,1,0 + .stabs "TWO(a,b) (a + (a) + 2 * b)",54,0,2,0 + .stabs "ONE(c) (c + 19)",54,0,3,0 + .stabs "ONE",58,0,10,0 + .stabs "ONE(c) (c + 23)",54,0,11,0 +</pre></div> + +<p>NOTE: In the above example, <code>54</code> is <code>N_MAC_DEFINE</code> and +<code>58</code> is <code>N_MAC_UNDEF</code>. +</p> + + + +</body> +</html> |