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<title>Debugging with GDB: gdb.types</title>
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<a name="gdb_002etypes"></a>
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<p>
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Next: <a href="gdb_002eprompt.html#gdb_002eprompt" accesskey="n" rel="next">gdb.prompt</a>, Previous: <a href="gdb_002eprinting.html#gdb_002eprinting" accesskey="p" rel="previous">gdb.printing</a>, Up: <a href="Python-modules.html#Python-modules" accesskey="u" rel="up">Python modules</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_002etypes-1"></a>
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<h4 class="subsubsection">23.2.4.2 gdb.types</h4>
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<a name="index-gdb_002etypes"></a>
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<p>This module provides a collection of utilities for working with
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<code>gdb.Type</code> objects.
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</p>
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<dl compact="compact">
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<dt><code>get_basic_type (<var>type</var>)</code></dt>
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<dd><p>Return <var>type</var> with const and volatile qualifiers stripped,
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and with typedefs and C<tt>++</tt> references converted to the underlying type.
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</p>
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<p>C<tt>++</tt> example:
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</p>
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<div class="smallexample">
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<pre class="smallexample">typedef const int const_int;
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const_int foo (3);
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const_int& foo_ref (foo);
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int main () { return 0; }
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</pre></div>
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<p>Then in gdb:
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</p>
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<div class="smallexample">
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<pre class="smallexample">(gdb) start
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(gdb) python import gdb.types
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(gdb) python foo_ref = gdb.parse_and_eval("foo_ref")
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(gdb) python print gdb.types.get_basic_type(foo_ref.type)
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int
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</pre></div>
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</dd>
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<dt><code>has_field (<var>type</var>, <var>field</var>)</code></dt>
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<dd><p>Return <code>True</code> if <var>type</var>, assumed to be a type with fields
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(e.g., a structure or union), has field <var>field</var>.
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</p>
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</dd>
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<dt><code>make_enum_dict (<var>enum_type</var>)</code></dt>
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<dd><p>Return a Python <code>dictionary</code> type produced from <var>enum_type</var>.
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</p>
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</dd>
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<dt><code>deep_items (<var>type</var>)</code></dt>
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<dd><p>Returns a Python iterator similar to the standard
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<code>gdb.Type.iteritems</code> method, except that the iterator returned
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by <code>deep_items</code> will recursively traverse anonymous struct or
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union fields. For example:
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</p>
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<div class="smallexample">
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<pre class="smallexample">struct A
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{
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int a;
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union {
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int b0;
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int b1;
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};
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};
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</pre></div>
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<p>Then in <small>GDB</small>:
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</p><div class="smallexample">
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<pre class="smallexample">(gdb) python import gdb.types
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(gdb) python struct_a = gdb.lookup_type("struct A")
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(gdb) python print struct_a.keys ()
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{['a', '']}
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(gdb) python print [k for k,v in gdb.types.deep_items(struct_a)]
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{['a', 'b0', 'b1']}
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</pre></div>
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</dd>
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<dt><code>get_type_recognizers ()</code></dt>
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<dd><p>Return a list of the enabled type recognizers for the current context.
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This is called by <small>GDB</small> during the type-printing process
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(see <a href="Type-Printing-API.html#Type-Printing-API">Type Printing API</a>).
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</p>
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</dd>
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<dt><code>apply_type_recognizers (recognizers, type_obj)</code></dt>
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<dd><p>Apply the type recognizers, <var>recognizers</var>, to the type object
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<var>type_obj</var>. If any recognizer returns a string, return that
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string. Otherwise, return <code>None</code>. This is called by
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<small>GDB</small> during the type-printing process (see <a href="Type-Printing-API.html#Type-Printing-API">Type Printing API</a>).
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</p>
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</dd>
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<dt><code>register_type_printer (locus, printer)</code></dt>
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<dd><p>This is a convenience function to register a type printer
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<var>printer</var>. The printer must implement the type printer protocol.
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The <var>locus</var> argument is either a <code>gdb.Objfile</code>, in which case
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the printer is registered with that objfile; a <code>gdb.Progspace</code>,
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in which case the printer is registered with that progspace; or
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<code>None</code>, in which case the printer is registered globally.
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</p>
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</dd>
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<dt><code>TypePrinter</code></dt>
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<dd><p>This is a base class that implements the type printer protocol. Type
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printers are encouraged, but not required, to derive from this class.
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It defines a constructor:
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</p>
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<dl>
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<dt><a name="index-_005f_005finit_005f_005f-on-TypePrinter"></a>Method on TypePrinter: <strong>__init__</strong> <em>(self, name)</em></dt>
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<dd><p>Initialize the type printer with the given name. The new printer
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starts in the enabled state.
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</p></dd></dl>
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</dd>
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</dl>
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<hr>
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<div class="header">
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<p>
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Next: <a href="gdb_002eprompt.html#gdb_002eprompt" accesskey="n" rel="next">gdb.prompt</a>, Previous: <a href="gdb_002eprinting.html#gdb_002eprinting" accesskey="p" rel="previous">gdb.printing</a>, Up: <a href="Python-modules.html#Python-modules" accesskey="u" rel="up">Python modules</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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