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<title>Debugging with GDB: Types In Python</title>
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<a name="Types-In-Python"></a>
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<p>
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Next: <a href="Pretty-Printing-API.html#Pretty-Printing-API" accesskey="n" rel="next">Pretty Printing API</a>, Previous: <a href="Values-From-Inferior.html#Values-From-Inferior" accesskey="p" rel="previous">Values From Inferior</a>, Up: <a href="Python-API.html#Python-API" accesskey="u" rel="up">Python API</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="Types-In-Python-1"></a>
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<h4 class="subsubsection">23.2.2.4 Types In Python</h4>
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<a name="index-types-in-Python"></a>
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<a name="index-Python_002c-working-with-types"></a>
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<a name="index-gdb_002eType"></a>
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<p><small>GDB</small> represents types from the inferior using the class
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<code>gdb.Type</code>.
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</p>
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<p>The following type-related functions are available in the <code>gdb</code>
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module:
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</p>
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<a name="index-gdb_002elookup_005ftype"></a>
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<dl>
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<dt><a name="index-gdb_002elookup_005ftype-1"></a>Function: <strong>gdb.lookup_type</strong> <em>(name <span class="roman">[</span>, block<span class="roman">]</span>)</em></dt>
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<dd><p>This function looks up a type by its <var>name</var>, which must be a string.
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</p>
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<p>If <var>block</var> is given, then <var>name</var> is looked up in that scope.
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Otherwise, it is searched for globally.
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</p>
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<p>Ordinarily, this function will return an instance of <code>gdb.Type</code>.
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If the named type cannot be found, it will throw an exception.
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</p></dd></dl>
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<p>If the type is a structure or class type, or an enum type, the fields
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of that type can be accessed using the Python <em>dictionary syntax</em>.
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For example, if <code>some_type</code> is a <code>gdb.Type</code> instance holding
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a structure type, you can access its <code>foo</code> field with:
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</p>
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<div class="smallexample">
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<pre class="smallexample">bar = some_type['foo']
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</pre></div>
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<p><code>bar</code> will be a <code>gdb.Field</code> object; see below under the
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description of the <code>Type.fields</code> method for a description of the
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<code>gdb.Field</code> class.
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</p>
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<p>An instance of <code>Type</code> has the following attributes:
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</p>
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<dl>
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<dt><a name="index-Type_002ealignof"></a>Variable: <strong>Type.alignof</strong></dt>
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<dd><p>The alignment of this type, in bytes. Type alignment comes from the
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debugging information; if it was not specified, then <small>GDB</small> will
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use the relevant ABI to try to determine the alignment. In some
|
cases, even this is not possible, and zero will be returned.
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</p></dd></dl>
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<dl>
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<dt><a name="index-Type_002ecode"></a>Variable: <strong>Type.code</strong></dt>
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<dd><p>The type code for this type. The type code will be one of the
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<code>TYPE_CODE_</code> constants defined below.
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</p></dd></dl>
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<dl>
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<dt><a name="index-Type_002edynamic"></a>Variable: <strong>Type.dynamic</strong></dt>
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<dd><p>A boolean indicating whether this type is dynamic. In some
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situations, such as Rust <code>enum</code> types or Ada variant records, the
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concrete type of a value may vary depending on its contents. That is,
|
the declared type of a variable, or the type returned by
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<code>gdb.lookup_type</code> may be dynamic; while the type of the
|
variable’s value will be a concrete instance of that dynamic type.
|
</p>
|
<p>For example, consider this code:
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</p><div class="smallexample">
|
<pre class="smallexample">int n;
|
int array[n];
|
</pre></div>
|
|
<p>Here, at least conceptually (whether your compiler actually does this
|
is a separate issue), examining <code><span class="nolinebreak">gdb.lookup_symbol("array",</span> ...).type</code><!-- /@w -->
|
could yield a <code>gdb.Type</code> which reports a size of <code>None</code>.
|
This is the dynamic type.
|
</p>
|
<p>However, examining <code>gdb.parse_and_eval("array").type</code> would yield
|
a concrete type, whose length would be known.
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</p></dd></dl>
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<dl>
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<dt><a name="index-Type_002ename"></a>Variable: <strong>Type.name</strong></dt>
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<dd><p>The name of this type. If this type has no name, then <code>None</code>
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is returned.
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</p></dd></dl>
|
|
<dl>
|
<dt><a name="index-Type_002esizeof"></a>Variable: <strong>Type.sizeof</strong></dt>
|
<dd><p>The size of this type, in target <code>char</code> units. Usually, a
|
target’s <code>char</code> type will be an 8-bit byte. However, on some
|
unusual platforms, this type may have a different size. A dynamic
|
type may not have a fixed size; in this case, this attribute’s value
|
will be <code>None</code>.
|
</p></dd></dl>
|
|
<dl>
|
<dt><a name="index-Type_002etag"></a>Variable: <strong>Type.tag</strong></dt>
|
<dd><p>The tag name for this type. The tag name is the name after
|
<code>struct</code>, <code>union</code>, or <code>enum</code> in C and C<tt>++</tt>; not all
|
languages have this concept. If this type has no tag name, then
|
<code>None</code> is returned.
|
</p></dd></dl>
|
|
<dl>
|
<dt><a name="index-Type_002eobjfile"></a>Variable: <strong>Type.objfile</strong></dt>
|
<dd><p>The <code>gdb.Objfile</code> that this type was defined in, or <code>None</code> if
|
there is no associated objfile.
|
</p></dd></dl>
|
|
<p>The following methods are provided:
|
</p>
|
<dl>
|
<dt><a name="index-Type_002efields"></a>Function: <strong>Type.fields</strong> <em>()</em></dt>
|
<dd><p>For structure and union types, this method returns the fields. Range
|
types have two fields, the minimum and maximum values. Enum types
|
have one field per enum constant. Function and method types have one
|
field per parameter. The base types of C<tt>++</tt> classes are also
|
represented as fields. If the type has no fields, or does not fit
|
into one of these categories, an empty sequence will be returned.
|
</p>
|
<p>Each field is a <code>gdb.Field</code> object, with some pre-defined attributes:
|
</p><dl compact="compact">
|
<dt><code>bitpos</code></dt>
|
<dd><p>This attribute is not available for <code>enum</code> or <code>static</code>
|
(as in C<tt>++</tt>) fields. The value is the position, counting
|
in bits, from the start of the containing type. Note that, in a
|
dynamic type, the position of a field may not be constant. In this
|
case, the value will be <code>None</code>. Also, a dynamic type may have
|
fields that do not appear in a corresponding concrete type.
|
</p>
|
</dd>
|
<dt><code>enumval</code></dt>
|
<dd><p>This attribute is only available for <code>enum</code> fields, and its value
|
is the enumeration member’s integer representation.
|
</p>
|
</dd>
|
<dt><code>name</code></dt>
|
<dd><p>The name of the field, or <code>None</code> for anonymous fields.
|
</p>
|
</dd>
|
<dt><code>artificial</code></dt>
|
<dd><p>This is <code>True</code> if the field is artificial, usually meaning that
|
it was provided by the compiler and not the user. This attribute is
|
always provided, and is <code>False</code> if the field is not artificial.
|
</p>
|
</dd>
|
<dt><code>is_base_class</code></dt>
|
<dd><p>This is <code>True</code> if the field represents a base class of a C<tt>++</tt>
|
structure. This attribute is always provided, and is <code>False</code>
|
if the field is not a base class of the type that is the argument of
|
<code>fields</code>, or if that type was not a C<tt>++</tt> class.
|
</p>
|
</dd>
|
<dt><code>bitsize</code></dt>
|
<dd><p>If the field is packed, or is a bitfield, then this will have a
|
non-zero value, which is the size of the field in bits. Otherwise,
|
this will be zero; in this case the field’s size is given by its type.
|
</p>
|
</dd>
|
<dt><code>type</code></dt>
|
<dd><p>The type of the field. This is usually an instance of <code>Type</code>,
|
but it can be <code>None</code> in some situations.
|
</p>
|
</dd>
|
<dt><code>parent_type</code></dt>
|
<dd><p>The type which contains this field. This is an instance of
|
<code>gdb.Type</code>.
|
</p></dd>
|
</dl>
|
</dd></dl>
|
|
<dl>
|
<dt><a name="index-Type_002earray"></a>Function: <strong>Type.array</strong> <em>(<var>n1</var> <span class="roman">[</span>, <var>n2</var><span class="roman">]</span>)</em></dt>
|
<dd><p>Return a new <code>gdb.Type</code> object which represents an array of this
|
type. If one argument is given, it is the inclusive upper bound of
|
the array; in this case the lower bound is zero. If two arguments are
|
given, the first argument is the lower bound of the array, and the
|
second argument is the upper bound of the array. An array’s length
|
must not be negative, but the bounds can be.
|
</p></dd></dl>
|
|
<dl>
|
<dt><a name="index-Type_002evector"></a>Function: <strong>Type.vector</strong> <em>(<var>n1</var> <span class="roman">[</span>, <var>n2</var><span class="roman">]</span>)</em></dt>
|
<dd><p>Return a new <code>gdb.Type</code> object which represents a vector of this
|
type. If one argument is given, it is the inclusive upper bound of
|
the vector; in this case the lower bound is zero. If two arguments are
|
given, the first argument is the lower bound of the vector, and the
|
second argument is the upper bound of the vector. A vector’s length
|
must not be negative, but the bounds can be.
|
</p>
|
<p>The difference between an <code>array</code> and a <code>vector</code> is that
|
arrays behave like in C: when used in expressions they decay to a pointer
|
to the first element whereas vectors are treated as first class values.
|
</p></dd></dl>
|
|
<dl>
|
<dt><a name="index-Type_002econst"></a>Function: <strong>Type.const</strong> <em>()</em></dt>
|
<dd><p>Return a new <code>gdb.Type</code> object which represents a
|
<code>const</code>-qualified variant of this type.
|
</p></dd></dl>
|
|
<dl>
|
<dt><a name="index-Type_002evolatile"></a>Function: <strong>Type.volatile</strong> <em>()</em></dt>
|
<dd><p>Return a new <code>gdb.Type</code> object which represents a
|
<code>volatile</code>-qualified variant of this type.
|
</p></dd></dl>
|
|
<dl>
|
<dt><a name="index-Type_002eunqualified"></a>Function: <strong>Type.unqualified</strong> <em>()</em></dt>
|
<dd><p>Return a new <code>gdb.Type</code> object which represents an unqualified
|
variant of this type. That is, the result is neither <code>const</code> nor
|
<code>volatile</code>.
|
</p></dd></dl>
|
|
<dl>
|
<dt><a name="index-Type_002erange"></a>Function: <strong>Type.range</strong> <em>()</em></dt>
|
<dd><p>Return a Python <code>Tuple</code> object that contains two elements: the
|
low bound of the argument type and the high bound of that type. If
|
the type does not have a range, <small>GDB</small> will raise a
|
<code>gdb.error</code> exception (see <a href="Exception-Handling.html#Exception-Handling">Exception Handling</a>).
|
</p></dd></dl>
|
|
<dl>
|
<dt><a name="index-Type_002ereference"></a>Function: <strong>Type.reference</strong> <em>()</em></dt>
|
<dd><p>Return a new <code>gdb.Type</code> object which represents a reference to this
|
type.
|
</p></dd></dl>
|
|
<dl>
|
<dt><a name="index-Type_002epointer"></a>Function: <strong>Type.pointer</strong> <em>()</em></dt>
|
<dd><p>Return a new <code>gdb.Type</code> object which represents a pointer to this
|
type.
|
</p></dd></dl>
|
|
<dl>
|
<dt><a name="index-Type_002estrip_005ftypedefs"></a>Function: <strong>Type.strip_typedefs</strong> <em>()</em></dt>
|
<dd><p>Return a new <code>gdb.Type</code> that represents the real type,
|
after removing all layers of typedefs.
|
</p></dd></dl>
|
|
<dl>
|
<dt><a name="index-Type_002etarget"></a>Function: <strong>Type.target</strong> <em>()</em></dt>
|
<dd><p>Return a new <code>gdb.Type</code> object which represents the target type
|
of this type.
|
</p>
|
<p>For a pointer type, the target type is the type of the pointed-to
|
object. For an array type (meaning C-like arrays), the target type is
|
the type of the elements of the array. For a function or method type,
|
the target type is the type of the return value. For a complex type,
|
the target type is the type of the elements. For a typedef, the
|
target type is the aliased type.
|
</p>
|
<p>If the type does not have a target, this method will throw an
|
exception.
|
</p></dd></dl>
|
|
<dl>
|
<dt><a name="index-Type_002etemplate_005fargument"></a>Function: <strong>Type.template_argument</strong> <em>(n <span class="roman">[</span>, block<span class="roman">]</span>)</em></dt>
|
<dd><p>If this <code>gdb.Type</code> is an instantiation of a template, this will
|
return a new <code>gdb.Value</code> or <code>gdb.Type</code> which represents the
|
value of the <var>n</var>th template argument (indexed starting at 0).
|
</p>
|
<p>If this <code>gdb.Type</code> is not a template type, or if the type has fewer
|
than <var>n</var> template arguments, this will throw an exception.
|
Ordinarily, only C<tt>++</tt> code will have template types.
|
</p>
|
<p>If <var>block</var> is given, then <var>name</var> is looked up in that scope.
|
Otherwise, it is searched for globally.
|
</p></dd></dl>
|
|
<dl>
|
<dt><a name="index-Type_002eoptimized_005fout"></a>Function: <strong>Type.optimized_out</strong> <em>()</em></dt>
|
<dd><p>Return <code>gdb.Value</code> instance of this type whose value is optimized
|
out. This allows a frame decorator to indicate that the value of an
|
argument or a local variable is not known.
|
</p></dd></dl>
|
|
<p>Each type has a code, which indicates what category this type falls
|
into. The available type categories are represented by constants
|
defined in the <code>gdb</code> module:
|
</p>
|
<dl compact="compact">
|
<dd><a name="index-TYPE_005fCODE_005fPTR"></a>
|
</dd>
|
<dt><code>gdb.TYPE_CODE_PTR</code>
|
<a name="index-gdb_002eTYPE_005fCODE_005fPTR"></a>
|
</dt>
|
<dd><p>The type is a pointer.
|
</p>
|
<a name="index-TYPE_005fCODE_005fARRAY"></a>
|
</dd>
|
<dt><code>gdb.TYPE_CODE_ARRAY</code>
|
<a name="index-gdb_002eTYPE_005fCODE_005fARRAY"></a>
|
</dt>
|
<dd><p>The type is an array.
|
</p>
|
<a name="index-TYPE_005fCODE_005fSTRUCT"></a>
|
</dd>
|
<dt><code>gdb.TYPE_CODE_STRUCT</code>
|
<a name="index-gdb_002eTYPE_005fCODE_005fSTRUCT"></a>
|
</dt>
|
<dd><p>The type is a structure.
|
</p>
|
<a name="index-TYPE_005fCODE_005fUNION"></a>
|
</dd>
|
<dt><code>gdb.TYPE_CODE_UNION</code>
|
<a name="index-gdb_002eTYPE_005fCODE_005fUNION"></a>
|
</dt>
|
<dd><p>The type is a union.
|
</p>
|
<a name="index-TYPE_005fCODE_005fENUM"></a>
|
</dd>
|
<dt><code>gdb.TYPE_CODE_ENUM</code>
|
<a name="index-gdb_002eTYPE_005fCODE_005fENUM"></a>
|
</dt>
|
<dd><p>The type is an enum.
|
</p>
|
<a name="index-TYPE_005fCODE_005fFLAGS"></a>
|
</dd>
|
<dt><code>gdb.TYPE_CODE_FLAGS</code>
|
<a name="index-gdb_002eTYPE_005fCODE_005fFLAGS"></a>
|
</dt>
|
<dd><p>A bit flags type, used for things such as status registers.
|
</p>
|
<a name="index-TYPE_005fCODE_005fFUNC"></a>
|
</dd>
|
<dt><code>gdb.TYPE_CODE_FUNC</code>
|
<a name="index-gdb_002eTYPE_005fCODE_005fFUNC"></a>
|
</dt>
|
<dd><p>The type is a function.
|
</p>
|
<a name="index-TYPE_005fCODE_005fINT"></a>
|
</dd>
|
<dt><code>gdb.TYPE_CODE_INT</code>
|
<a name="index-gdb_002eTYPE_005fCODE_005fINT"></a>
|
</dt>
|
<dd><p>The type is an integer type.
|
</p>
|
<a name="index-TYPE_005fCODE_005fFLT"></a>
|
</dd>
|
<dt><code>gdb.TYPE_CODE_FLT</code>
|
<a name="index-gdb_002eTYPE_005fCODE_005fFLT"></a>
|
</dt>
|
<dd><p>A floating point type.
|
</p>
|
<a name="index-TYPE_005fCODE_005fVOID"></a>
|
</dd>
|
<dt><code>gdb.TYPE_CODE_VOID</code>
|
<a name="index-gdb_002eTYPE_005fCODE_005fVOID"></a>
|
</dt>
|
<dd><p>The special type <code>void</code>.
|
</p>
|
<a name="index-TYPE_005fCODE_005fSET"></a>
|
</dd>
|
<dt><code>gdb.TYPE_CODE_SET</code>
|
<a name="index-gdb_002eTYPE_005fCODE_005fSET"></a>
|
</dt>
|
<dd><p>A Pascal set type.
|
</p>
|
<a name="index-TYPE_005fCODE_005fRANGE"></a>
|
</dd>
|
<dt><code>gdb.TYPE_CODE_RANGE</code>
|
<a name="index-gdb_002eTYPE_005fCODE_005fRANGE"></a>
|
</dt>
|
<dd><p>A range type, that is, an integer type with bounds.
|
</p>
|
<a name="index-TYPE_005fCODE_005fSTRING"></a>
|
</dd>
|
<dt><code>gdb.TYPE_CODE_STRING</code>
|
<a name="index-gdb_002eTYPE_005fCODE_005fSTRING"></a>
|
</dt>
|
<dd><p>A string type. Note that this is only used for certain languages with
|
language-defined string types; C strings are not represented this way.
|
</p>
|
<a name="index-TYPE_005fCODE_005fBITSTRING"></a>
|
</dd>
|
<dt><code>gdb.TYPE_CODE_BITSTRING</code>
|
<a name="index-gdb_002eTYPE_005fCODE_005fBITSTRING"></a>
|
</dt>
|
<dd><p>A string of bits. It is deprecated.
|
</p>
|
<a name="index-TYPE_005fCODE_005fERROR"></a>
|
</dd>
|
<dt><code>gdb.TYPE_CODE_ERROR</code>
|
<a name="index-gdb_002eTYPE_005fCODE_005fERROR"></a>
|
</dt>
|
<dd><p>An unknown or erroneous type.
|
</p>
|
<a name="index-TYPE_005fCODE_005fMETHOD"></a>
|
</dd>
|
<dt><code>gdb.TYPE_CODE_METHOD</code>
|
<a name="index-gdb_002eTYPE_005fCODE_005fMETHOD"></a>
|
</dt>
|
<dd><p>A method type, as found in C<tt>++</tt>.
|
</p>
|
<a name="index-TYPE_005fCODE_005fMETHODPTR"></a>
|
</dd>
|
<dt><code>gdb.TYPE_CODE_METHODPTR</code>
|
<a name="index-gdb_002eTYPE_005fCODE_005fMETHODPTR"></a>
|
</dt>
|
<dd><p>A pointer-to-member-function.
|
</p>
|
<a name="index-TYPE_005fCODE_005fMEMBERPTR"></a>
|
</dd>
|
<dt><code>gdb.TYPE_CODE_MEMBERPTR</code>
|
<a name="index-gdb_002eTYPE_005fCODE_005fMEMBERPTR"></a>
|
</dt>
|
<dd><p>A pointer-to-member.
|
</p>
|
<a name="index-TYPE_005fCODE_005fREF"></a>
|
</dd>
|
<dt><code>gdb.TYPE_CODE_REF</code>
|
<a name="index-gdb_002eTYPE_005fCODE_005fREF"></a>
|
</dt>
|
<dd><p>A reference type.
|
</p>
|
<a name="index-TYPE_005fCODE_005fRVALUE_005fREF"></a>
|
</dd>
|
<dt><code>gdb.TYPE_CODE_RVALUE_REF</code>
|
<a name="index-gdb_002eTYPE_005fCODE_005fRVALUE_005fREF"></a>
|
</dt>
|
<dd><p>A C<tt>++</tt>11 rvalue reference type.
|
</p>
|
<a name="index-TYPE_005fCODE_005fCHAR"></a>
|
</dd>
|
<dt><code>gdb.TYPE_CODE_CHAR</code>
|
<a name="index-gdb_002eTYPE_005fCODE_005fCHAR"></a>
|
</dt>
|
<dd><p>A character type.
|
</p>
|
<a name="index-TYPE_005fCODE_005fBOOL"></a>
|
</dd>
|
<dt><code>gdb.TYPE_CODE_BOOL</code>
|
<a name="index-gdb_002eTYPE_005fCODE_005fBOOL"></a>
|
</dt>
|
<dd><p>A boolean type.
|
</p>
|
<a name="index-TYPE_005fCODE_005fCOMPLEX"></a>
|
</dd>
|
<dt><code>gdb.TYPE_CODE_COMPLEX</code>
|
<a name="index-gdb_002eTYPE_005fCODE_005fCOMPLEX"></a>
|
</dt>
|
<dd><p>A complex float type.
|
</p>
|
<a name="index-TYPE_005fCODE_005fTYPEDEF"></a>
|
</dd>
|
<dt><code>gdb.TYPE_CODE_TYPEDEF</code>
|
<a name="index-gdb_002eTYPE_005fCODE_005fTYPEDEF"></a>
|
</dt>
|
<dd><p>A typedef to some other type.
|
</p>
|
<a name="index-TYPE_005fCODE_005fNAMESPACE"></a>
|
</dd>
|
<dt><code>gdb.TYPE_CODE_NAMESPACE</code>
|
<a name="index-gdb_002eTYPE_005fCODE_005fNAMESPACE"></a>
|
</dt>
|
<dd><p>A C<tt>++</tt> namespace.
|
</p>
|
<a name="index-TYPE_005fCODE_005fDECFLOAT"></a>
|
</dd>
|
<dt><code>gdb.TYPE_CODE_DECFLOAT</code>
|
<a name="index-gdb_002eTYPE_005fCODE_005fDECFLOAT"></a>
|
</dt>
|
<dd><p>A decimal floating point type.
|
</p>
|
<a name="index-TYPE_005fCODE_005fINTERNAL_005fFUNCTION"></a>
|
</dd>
|
<dt><code>gdb.TYPE_CODE_INTERNAL_FUNCTION</code>
|
<a name="index-gdb_002eTYPE_005fCODE_005fINTERNAL_005fFUNCTION"></a>
|
</dt>
|
<dd><p>A function internal to <small>GDB</small>. This is the type used to represent
|
convenience functions.
|
</p></dd>
|
</dl>
|
|
<p>Further support for types is provided in the <code>gdb.types</code>
|
Python module (see <a href="gdb_002etypes.html#gdb_002etypes">gdb.types</a>).
|
</p>
|
<hr>
|
<div class="header">
|
<p>
|
Next: <a href="Pretty-Printing-API.html#Pretty-Printing-API" accesskey="n" rel="next">Pretty Printing API</a>, Previous: <a href="Values-From-Inferior.html#Values-From-Inferior" accesskey="p" rel="previous">Values From Inferior</a>, Up: <a href="Python-API.html#Python-API" accesskey="u" rel="up">Python API</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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