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  1. <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

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  16. <head>

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  18. <title>GDB/M2 (Debugging with GDB)</title>

  19. 

  20. <meta name="description" content="GDB/M2 (Debugging with GDB)">

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  25. <link href="index.html#Top" rel="start" title="Top">

  26. <link href="Concept-Index.html#Concept-Index" rel="index" title="Concept Index">

  27. <link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">

  28. <link href="Modula_002d2.html#Modula_002d2" rel="up" title="Modula-2">

  29. <link href="Ada.html#Ada" rel="next" title="Ada">

  30. <link href="M2-Scope.html#M2-Scope" rel="prev" title="M2 Scope">

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  63. <a name="GDB_002fM2"></a>

  64. <div class="header">

  65. <p>

  66. 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> &nbsp; [<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>

  67. </div>

  68. <hr>

  69. <a name="GDB-and-Modula_002d2"></a>

  70. <h4 class="subsubsection">15.4.9.9 <small>GDB</small> and Modula-2</h4>

  71. 

  72. <p>Some <small>GDB</small> commands have little use when debugging Modula-2 programs.

  73. Five subcommands of <code>set print</code> and <code>show print</code> apply

  74. specifically to C and C<tt>++</tt>: &lsquo;<samp>vtbl</samp>&rsquo;, &lsquo;<samp>demangle</samp>&rsquo;,

  75. &lsquo;<samp>asm-demangle</samp>&rsquo;, &lsquo;<samp>object</samp>&rsquo;, and &lsquo;<samp>union</samp>&rsquo;.  The first four

  76. apply to C<tt>++</tt>, and the last to the C <code>union</code> type, which has no direct

  77. analogue in Modula-2.

  78. </p>

  79. <p>The <code>@</code> operator (see <a href="Expressions.html#Expressions">Expressions</a>), while available

  80. with any language, is not useful with Modula-2.  Its

  81. intent is to aid the debugging of <em>dynamic arrays</em>, which cannot be

  82. created in Modula-2 as they can in C or C<tt>++</tt>.  However, because an

  83. address can be specified by an integral constant, the construct

  84. &lsquo;<samp>{<var>type</var>}<var>adrexp</var></samp>&rsquo; is still useful.

  85. </p>

  86. <a name="index-_0023-in-Modula_002d2"></a>

  87. <p>In <small>GDB</small> scripts, the Modula-2 inequality operator <code>#</code> is

  88. interpreted as the beginning of a comment.  Use <code>&lt;&gt;</code> instead.

  89. </p>

  90. 

  91. 

  92. 

  93. </body>

  94. </html>