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99 lines
4.0 KiB
HTML
99 lines
4.0 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>M2 Checks (Debugging with GDB)</title>
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<meta name="description" content="M2 Checks (Debugging with GDB)">
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<meta name="keywords" content="M2 Checks (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="M2-Scope.html#M2-Scope" rel="next" title="M2 Scope">
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<link href="Deviations.html#Deviations" rel="prev" title="Deviations">
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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="M2-Checks"></a>
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<div class="header">
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<p>
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Next: <a href="M2-Scope.html#M2-Scope" accesskey="n" rel="next">M2 Scope</a>, Previous: <a href="Deviations.html#Deviations" accesskey="p" rel="prev">Deviations</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="Modula_002d2-Type-and-Range-Checks"></a>
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<h4 class="subsubsection">15.4.9.7 Modula-2 Type and Range Checks</h4>
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<a name="index-Modula_002d2-checks"></a>
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<blockquote>
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<p><em>Warning:</em> in this release, <small>GDB</small> does not yet perform type or
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range checking.
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</p></blockquote>
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<p><small>GDB</small> considers two Modula-2 variables type equivalent if:
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</p>
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<ul>
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<li> They are of types that have been declared equivalent via a <code>TYPE
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<var>t1</var> = <var>t2</var></code> statement
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</li><li> They have been declared on the same line. (Note: This is true of the
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<small>GNU</small> Modula-2 compiler, but it may not be true of other compilers.)
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</li></ul>
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<p>As long as type checking is enabled, any attempt to combine variables
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whose types are not equivalent is an error.
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</p>
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<p>Range checking is done on all mathematical operations, assignment, array
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index bounds, and all built-in functions and procedures.
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</p>
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</body>
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</html>
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