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95 lines
4.3 KiB
HTML
95 lines
4.3 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) 1988-2019 Free Software Foundation, Inc.
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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 the
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Invariant Sections being "Free Software" and "Free Software Needs
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Free Documentation", with the Front-Cover Texts being "A GNU Manual,"
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and with the Back-Cover Texts as in (a) below.
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(a) The FSF's Back-Cover Text is: "You are free to copy and modify
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this GNU Manual. Buying copies from GNU Press supports the FSF in
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developing GNU and promoting software freedom." -->
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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>GDB/M2 (Debugging with GDB)</title>
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<meta name="description" content="GDB/M2 (Debugging with GDB)">
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<meta name="keywords" content="GDB/M2 (Debugging with GDB)">
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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="Concept-Index.html#Concept-Index" rel="index" title="Concept Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="Modula_002d2.html#Modula_002d2" rel="up" title="Modula-2">
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<link href="Ada.html#Ada" rel="next" title="Ada">
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<link href="M2-Scope.html#M2-Scope" rel="prev" title="M2 Scope">
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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="GDB_002fM2"></a>
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<div class="header">
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<p>
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Previous: <a href="M2-Scope.html#M2-Scope" accesskey="p" rel="prev">M2 Scope</a>, Up: <a href="Modula_002d2.html#Modula_002d2" accesskey="u" rel="up">Modula-2</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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<hr>
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<a name="GDB-and-Modula_002d2"></a>
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<h4 class="subsubsection">15.4.9.9 <small>GDB</small> and Modula-2</h4>
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<p>Some <small>GDB</small> commands have little use when debugging Modula-2 programs.
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Five subcommands of <code>set print</code> and <code>show print</code> apply
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specifically to C and C<tt>++</tt>: ‘<samp>vtbl</samp>’, ‘<samp>demangle</samp>’,
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‘<samp>asm-demangle</samp>’, ‘<samp>object</samp>’, and ‘<samp>union</samp>’. The first four
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apply to C<tt>++</tt>, and the last to the C <code>union</code> type, which has no direct
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analogue in Modula-2.
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</p>
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<p>The <code>@</code> operator (see <a href="Expressions.html#Expressions">Expressions</a>), while available
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with any language, is not useful with Modula-2. Its
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intent is to aid the debugging of <em>dynamic arrays</em>, which cannot be
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created in Modula-2 as they can in C or C<tt>++</tt>. However, because an
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address can be specified by an integral constant, the construct
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‘<samp>{<var>type</var>}<var>adrexp</var></samp>’ is still useful.
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</p>
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<a name="index-_0023-in-Modula_002d2"></a>
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<p>In <small>GDB</small> scripts, the Modula-2 inequality operator <code>#</code> is
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interpreted as the beginning of a comment. Use <code><></code> instead.
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</p>
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</body>
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</html>
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