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| Next: <a href="Decimal-Floating-Point.html#Decimal-Floating-Point" accesskey="n" rel="next">Decimal Floating Point</a>, Previous: <a href="Debugging-C.html#Debugging-C" accesskey="p" rel="prev">Debugging C</a>, Up: <a href="C.html#C" accesskey="u" rel="up">C</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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| <a name="GDB-Features-for-C_002b_002b"></a> |
| <h4 class="subsubsection">15.4.1.7 <small>GDB</small> Features for C<tt>++</tt></h4> |
| |
| <a name="index-commands-for-C_002b_002b"></a> |
| |
| <p>Some <small>GDB</small> commands are particularly useful with C<tt>++</tt>, and some are |
| designed specifically for use with C<tt>++</tt>. Here is a summary: |
| </p> |
| <dl compact="compact"> |
| <dd><a name="index-break-in-overloaded-functions"></a> |
| </dd> |
| <dt><code><span class="roman">breakpoint menus</span></code></dt> |
| <dd><p>When you want a breakpoint in a function whose name is overloaded, |
| <small>GDB</small> has the capability to display a menu of possible breakpoint |
| locations to help you specify which function definition you want. |
| See <a href="Ambiguous-Expressions.html#Ambiguous-Expressions">Ambiguous Expressions</a>. |
| </p> |
| <a name="index-overloading-in-C_002b_002b"></a> |
| </dd> |
| <dt><code>rbreak <var>regex</var></code></dt> |
| <dd><p>Setting breakpoints using regular expressions is helpful for setting |
| breakpoints on overloaded functions that are not members of any special |
| classes. |
| See <a href="Set-Breaks.html#Set-Breaks">Setting Breakpoints</a>. |
| </p> |
| <a name="index-C_002b_002b-exception-handling"></a> |
| </dd> |
| <dt><code>catch throw</code></dt> |
| <dt><code>catch rethrow</code></dt> |
| <dt><code>catch catch</code></dt> |
| <dd><p>Debug C<tt>++</tt> exception handling using these commands. See <a href="Set-Catchpoints.html#Set-Catchpoints">Setting Catchpoints</a>. |
| </p> |
| <a name="index-inheritance"></a> |
| </dd> |
| <dt><code>ptype <var>typename</var></code></dt> |
| <dd><p>Print inheritance relationships as well as other information for type |
| <var>typename</var>. |
| See <a href="Symbols.html#Symbols">Examining the Symbol Table</a>. |
| </p> |
| </dd> |
| <dt><code>info vtbl <var>expression</var>.</code></dt> |
| <dd><p>The <code>info vtbl</code> command can be used to display the virtual |
| method tables of the object computed by <var>expression</var>. This shows |
| one entry per virtual table; there may be multiple virtual tables when |
| multiple inheritance is in use. |
| </p> |
| <a name="index-C_002b_002b-demangling"></a> |
| </dd> |
| <dt><code>demangle <var>name</var></code></dt> |
| <dd><p>Demangle <var>name</var>. |
| See <a href="Symbols.html#Symbols">Symbols</a>, for a more complete description of the <code>demangle</code> command. |
| </p> |
| <a name="index-C_002b_002b-symbol-display"></a> |
| </dd> |
| <dt><code>set print demangle</code></dt> |
| <dt><code>show print demangle</code></dt> |
| <dt><code>set print asm-demangle</code></dt> |
| <dt><code>show print asm-demangle</code></dt> |
| <dd><p>Control whether C<tt>++</tt> symbols display in their source form, both when |
| displaying code as C<tt>++</tt> source and when displaying disassemblies. |
| See <a href="Print-Settings.html#Print-Settings">Print Settings</a>. |
| </p> |
| </dd> |
| <dt><code>set print object</code></dt> |
| <dt><code>show print object</code></dt> |
| <dd><p>Choose whether to print derived (actual) or declared types of objects. |
| See <a href="Print-Settings.html#Print-Settings">Print Settings</a>. |
| </p> |
| </dd> |
| <dt><code>set print vtbl</code></dt> |
| <dt><code>show print vtbl</code></dt> |
| <dd><p>Control the format for printing virtual function tables. |
| See <a href="Print-Settings.html#Print-Settings">Print Settings</a>. |
| (The <code>vtbl</code> commands do not work on programs compiled with the HP |
| ANSI C<tt>++</tt> compiler (<code>aCC</code>).) |
| </p> |
| <a name="index-set-overload_002dresolution"></a> |
| <a name="index-overloaded-functions_002c-overload-resolution"></a> |
| </dd> |
| <dt><code>set overload-resolution on</code></dt> |
| <dd><p>Enable overload resolution for C<tt>++</tt> expression evaluation. The default |
| is on. For overloaded functions, <small>GDB</small> evaluates the arguments |
| and searches for a function whose signature matches the argument types, |
| using the standard C<tt>++</tt> conversion rules (see <a href="C-Plus-Plus-Expressions.html#C-Plus-Plus-Expressions">C<tt>++</tt> Expressions</a>, for details). |
| If it cannot find a match, it emits a message. |
| </p> |
| </dd> |
| <dt><code>set overload-resolution off</code></dt> |
| <dd><p>Disable overload resolution for C<tt>++</tt> expression evaluation. For |
| overloaded functions that are not class member functions, <small>GDB</small> |
| chooses the first function of the specified name that it finds in the |
| symbol table, whether or not its arguments are of the correct type. For |
| overloaded functions that are class member functions, <small>GDB</small> |
| searches for a function whose signature <em>exactly</em> matches the |
| argument types. |
| </p> |
| <a name="index-show-overload_002dresolution"></a> |
| </dd> |
| <dt><code>show overload-resolution</code></dt> |
| <dd><p>Show the current setting of overload resolution. |
| </p> |
| </dd> |
| <dt><code><span class="roman">Overloaded symbol names</span></code></dt> |
| <dd><p>You can specify a particular definition of an overloaded symbol, using |
| the same notation that is used to declare such symbols in C<tt>++</tt>: type |
| <code><var>symbol</var>(<var>types</var>)</code> rather than just <var>symbol</var>. You can |
| also use the <small>GDB</small> command-line word completion facilities to list the |
| available choices, or to finish the type list for you. |
| See <a href="Completion.html#Completion">Command Completion</a>, for details on how to do this. |
| </p></dd> |
| </dl> |
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