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109 lines
4.7 KiB
HTML
109 lines
4.7 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>Ada Mode Intro (Debugging with GDB)</title>
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<meta name="description" content="Ada Mode Intro (Debugging with GDB)">
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<meta name="keywords" content="Ada Mode Intro (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="Ada.html#Ada" rel="up" title="Ada">
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<link href="Omissions-from-Ada.html#Omissions-from-Ada" rel="next" title="Omissions from Ada">
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<link href="Ada.html#Ada" rel="prev" title="Ada">
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</style>
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</head>
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<body lang="en">
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<a name="Ada-Mode-Intro"></a>
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<div class="header">
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<p>
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Next: <a href="Omissions-from-Ada.html#Omissions-from-Ada" accesskey="n" rel="next">Omissions from Ada</a>, Up: <a href="Ada.html#Ada" accesskey="u" rel="up">Ada</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="Introduction"></a>
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<h4 class="subsubsection">15.4.10.1 Introduction</h4>
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<a name="index-Ada-mode_002c-general"></a>
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<p>The Ada mode of <small>GDB</small> supports a fairly large subset of Ada expression
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syntax, with some extensions.
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The philosophy behind the design of this subset is
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</p>
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<ul>
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<li> That <small>GDB</small> should provide basic literals and access to operations for
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arithmetic, dereferencing, field selection, indexing, and subprogram calls,
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leaving more sophisticated computations to subprograms written into the
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program (which therefore may be called from <small>GDB</small>).
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</li><li> That type safety and strict adherence to Ada language restrictions
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are not particularly important to the <small>GDB</small> user.
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</li><li> That brevity is important to the <small>GDB</small> user.
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</li></ul>
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<p>Thus, for brevity, the debugger acts as if all names declared in
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user-written packages are directly visible, even if they are not visible
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according to Ada rules, thus making it unnecessary to fully qualify most
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names with their packages, regardless of context. Where this causes
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ambiguity, <small>GDB</small> asks the user’s intent.
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</p>
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<p>The debugger will start in Ada mode if it detects an Ada main program.
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As for other languages, it will enter Ada mode when stopped in a program that
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was translated from an Ada source file.
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</p>
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<p>While in Ada mode, you may use ‘<tt>--</tt>’ for comments. This is useful
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mostly for documenting command files. The standard <small>GDB</small> comment
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(‘<samp>#</samp>’) still works at the beginning of a line in Ada mode, but not in the
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middle (to allow based literals).
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</p>
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</body>
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</html>
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