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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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  18. <title>Ada Mode Intro (Debugging with GDB)</title>

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

  28. <link href="Ada.html#Ada" rel="up" title="Ada">

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

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  63. <a name="Ada-Mode-Intro"></a>

  64. <div class="header">

  65. <p>

  66. 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> &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="Introduction"></a>

  70. <h4 class="subsubsection">15.4.10.1 Introduction</h4>

  71. <a name="index-Ada-mode_002c-general"></a>

  72. 

  73. <p>The Ada mode of <small>GDB</small> supports a fairly large subset of Ada expression 

  74. syntax, with some extensions.

  75. The philosophy behind the design of this subset is 

  76. </p>

  77. <ul>

  78. <li> That <small>GDB</small> should provide basic literals and access to operations for 

  79. arithmetic, dereferencing, field selection, indexing, and subprogram calls, 

  80. leaving more sophisticated computations to subprograms written into the

  81. program (which therefore may be called from <small>GDB</small>).

  82. 

  83. </li><li> That type safety and strict adherence to Ada language restrictions

  84. are not particularly important to the <small>GDB</small> user.

  85. 

  86. </li><li> That brevity is important to the <small>GDB</small> user.

  87. </li></ul>

  88. 

  89. <p>Thus, for brevity, the debugger acts as if all names declared in

  90. user-written packages are directly visible, even if they are not visible

  91. according to Ada rules, thus making it unnecessary to fully qualify most

  92. names with their packages, regardless of context.  Where this causes

  93. ambiguity, <small>GDB</small> asks the user&rsquo;s intent.

  94. </p>

  95. <p>The debugger will start in Ada mode if it detects an Ada main program. 

  96. As for other languages, it will enter Ada mode when stopped in a program that

  97. was translated from an Ada source file.

  98. </p>

  99. <p>While in Ada mode, you may use &lsquo;<tt>--</tt>&rsquo; for comments.  This is useful 

  100. mostly for documenting command files.  The standard <small>GDB</small> comment 

  101. (&lsquo;<samp>#</samp>&rsquo;) still works at the beginning of a line in Ada mode, but not in the 

  102. middle (to allow based literals).

  103. </p>

  104. 

  105. 

  106. 

  107. </body>

  108. </html>