69 lines
3.4 KiB
HTML
69 lines
3.4 KiB
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<html lang="en">
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<head>
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<title>GDB/M2 - Debugging with GDB</title>
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<meta name="description" content="Debugging with GDB">
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<link title="Top" rel="start" href="index.html#Top">
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<link rel="up" href="Modula_002d2.html#Modula_002d2" title="Modula-2">
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<link rel="prev" href="M2-Scope.html#M2-Scope" title="M2 Scope">
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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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<body>
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<div class="node">
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<a name="GDB%2fM2"></a>
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<a name="GDB_002fM2"></a>
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<p>
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Previous: <a rel="previous" accesskey="p" href="M2-Scope.html#M2-Scope">M2 Scope</a>,
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Up: <a rel="up" accesskey="u" href="Modula_002d2.html#Modula_002d2">Modula-2</a>
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<hr>
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</div>
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<h5 class="subsubsection">15.4.9.9 <span class="sc">gdb</span> and Modula-2</h5>
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<p>Some <span class="sc">gdb</span> 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><span class="samp">vtbl</span></samp>’, ‘<samp><span class="samp">demangle</span></samp>’,
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‘<samp><span class="samp">asm-demangle</span></samp>’, ‘<samp><span class="samp">object</span></samp>’, and ‘<samp><span class="samp">union</span></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>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 <dfn>dynamic arrays</dfn>, 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><span class="samp">{</span><var>type</var><span class="samp">}</span><var>adrexp</var></samp>’ is still useful.
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<p><a name="index-g_t_0040code_007b_0023_007d-in-Modula_002d2-1055"></a>In <span class="sc">gdb</span> 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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</body></html>
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