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| <a name="Introduction"></a> |
| <h4 class="subsubsection">15.4.9.1 Introduction</h4> |
| <a name="index-Ada-mode_002c-general"></a> |
| |
| <p>The Ada mode of <small>GDB</small> supports a fairly large subset of Ada expression |
| syntax, with some extensions. |
| The philosophy behind the design of this subset is |
| </p> |
| <ul> |
| <li> That <small>GDB</small> should provide basic literals and access to operations for |
| arithmetic, dereferencing, field selection, indexing, and subprogram calls, |
| leaving more sophisticated computations to subprograms written into the |
| program (which therefore may be called from <small>GDB</small>). |
| |
| </li><li> That type safety and strict adherence to Ada language restrictions |
| are not particularly important to the <small>GDB</small> user. |
| |
| </li><li> That brevity is important to the <small>GDB</small> user. |
| </li></ul> |
| |
| <p>Thus, for brevity, the debugger acts as if all names declared in |
| user-written packages are directly visible, even if they are not visible |
| according to Ada rules, thus making it unnecessary to fully qualify most |
| names with their packages, regardless of context. Where this causes |
| ambiguity, <small>GDB</small> asks the user’s intent. |
| </p> |
| <p>The debugger will start in Ada mode if it detects an Ada main program. |
| As for other languages, it will enter Ada mode when stopped in a program that |
| was translated from an Ada source file. |
| </p> |
| <p>While in Ada mode, you may use ‘<tt>--</tt>’ for comments. This is useful |
| mostly for documenting command files. The standard <small>GDB</small> comment |
| (‘<samp>#</samp>’) still works at the beginning of a line in Ada mode, but not in the |
| middle (to allow based literals). |
| </p> |
| <p>The debugger supports limited overloading. Given a subprogram call in which |
| the function symbol has multiple definitions, it will use the number of |
| actual parameters and some information about their types to attempt to narrow |
| the set of definitions. It also makes very limited use of context, preferring |
| procedures to functions in the context of the <code>call</code> command, and |
| functions to procedures elsewhere. |
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