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[RFA] Re: Python: add field access by name and standard python mapping methods to gdb.Type
On Sep 23, 2011, at 12:33 PM, Doug Evans wrote:
> On Fri, Sep 16, 2011 at 8:27 AM, Paul Koning <paulkoning@comcast.net> wrote:
>>
>> Below is an update with the various comments addressed.
>
> Hi. This email is for just a couple of formatting nits.
>
>> 2011-09-15 Paul Koning <paul_koning@dell.com>
>>
>> * python/py-type.c (make_fielditem, typy_field_names, typy_items,
>> typy_length, typy_get, typy_has_key, typy_make_iter,
>> typy_iterkeys, typy_iteritems, typy_itervalues, typy_iter,
>> typy_iterator_iter, typy_iterator_iternext,
>> typy_iterator_dealloc): : New functions to implement standard
>> Python mapping methods on gdb.Type object.
>> (gdb.TypeIterator): New Python type.
>> * python/python-internal.h (gdbpy_iter_kind): New enum.
>> * doc/gdb.texinfo (gdb.Type): Document field access by dictionary
>> key syntax.
>
> Technically speaking, the rule is you can't extend a parenthesized name list
> over multiple lines. At least that's the rule I've been asked to follow.
> I'd like to see some flexibility here, and I'm not asking you change this here.
> Just pointing it out.
>
>> +/* Helper function for Type standard mapping methods. Returns a
>> + Python object for field i of the type. "kind" specifies what to
>> + return: the name of the field, a gdb.Field object corresponding to
>> + the field, or a tuple consisting of field name and gdb.Field
>> + object. */
>> +static PyObject *
>> +make_fielditem (struct type *type, int i, enum gdbpy_iter_kind kind)
>
> For functions the coding standards say to have a blank line between
> its comment and definition.
> I realize parts of gdb don't follow this rule, but this rule I like :-),
> it is documented, and I'd like to not make things worse.
>
> This needs to be fixed in several places.
I've fixed both -- the ChangeLog is now formatted according to an earlier example I see in ChangeLog.
Ok to commit?
paul
2011-09-26 Paul Koning <paul_koning@dell.com>
* python/py-type.c (make_fielditem, typy_field_names, typy_items)
(typy_length, typy_get, typy_has_key, typy_make_iter)
(typy_iterkeys, typy_iteritems, typy_itervalues, typy_iter)
(typy_iterator_iter, typy_iterator_iternext)
(typy_iterator_dealloc): : New functions to implement standard
Python mapping methods on gdb.Type object.
(gdb.TypeIterator): New Python type.
* python/python-internal.h (gdbpy_iter_kind): New enum.
* doc/gdb.texinfo (gdb.Type): Document field access by dictionary
key syntax.
2011-09-26 Paul Koning <paul_koning@dell.com>
* gdb.python/py-type.c (enum E): New.
* gdb.python/py-type.exp (test_fields): Add tests for Python
mapping access to fields.
(test_enums): New test for field access on enums.
Index: doc/gdb.texinfo
===================================================================
RCS file: /cvs/src/src/gdb/doc/gdb.texinfo,v
retrieving revision 1.862
diff -u -r1.862 gdb.texinfo
--- doc/gdb.texinfo 16 Sep 2011 09:07:01 -0000 1.862
+++ doc/gdb.texinfo 26 Sep 2011 15:54:34 -0000
@@ -21537,6 +21537,19 @@
If the named type cannot be found, it will throw an exception.
@end defun
+If the type is a structure or class type, or an enum type, the fields
+of that type can be accessed using the Python @dfn{dictionary syntax}.
+For example, if @code{some_type} is a @code{gdb.Type} instance holding
+a structure type, you can access its @code{foo} field with:
+
+@smallexample
+bar = some_type['foo']
+@end smallexample
+
+@code{bar} will be a @code{gdb.Field} object; see below under the
+description of the @code{Type.fields} method for a description of the
+@code{gdb.Field} class.
+
An instance of @code{Type} has the following attributes:
@table @code
@@ -21570,7 +21583,7 @@
represented as fields. If the type has no fields, or does not fit
into one of these categories, an empty sequence will be returned.
-Each field is an object, with some pre-defined attributes:
+Each field is a @code{gdb.Field} object, with some pre-defined attributes:
@table @code
@item bitpos
This attribute is not available for @code{static} fields (as in
Index: python/py-type.c
===================================================================
RCS file: /cvs/src/src/gdb/python/py-type.c,v
retrieving revision 1.21
diff -u -r1.21 py-type.c
--- python/py-type.c 15 Sep 2011 18:33:15 -0000 1.21
+++ python/py-type.c 26 Sep 2011 15:54:34 -0000
@@ -55,6 +55,19 @@
static PyTypeObject field_object_type;
+/* A type iterator object. */
+typedef struct {
+ PyObject_HEAD
+ /* The current field index. */
+ int field;
+ /* What to return. */
+ enum gdbpy_iter_kind kind;
+ /* Pointer back to the original source type object. */
+ struct pyty_type_object *source;
+} typy_iterator_object;
+
+static PyTypeObject type_iterator_object_type;
+
/* This is used to initialize various gdb.TYPE_ constants. */
struct pyty_code
{
@@ -137,7 +150,8 @@
}
/* Helper function for typy_fields which converts a single field to a
- dictionary. Returns NULL on error. */
+ gdb.Field object. Returns NULL on error. */
+
static PyObject *
convert_field (struct type *type, int field)
{
@@ -210,12 +224,73 @@
return NULL;
}
-/* Return a sequence of all fields. Each field is a dictionary with
- some pre-defined keys. */
+/* Helper function to return the name of a field, as a gdb.Field object.
+ If the field doesn't have a name, None is returned. */
+
static PyObject *
-typy_fields (PyObject *self, PyObject *args)
+field_name (struct type *type, int field)
{
PyObject *result;
+
+ if (TYPE_FIELD_NAME (type, field))
+ result = PyString_FromString (TYPE_FIELD_NAME (type, field));
+ else
+ {
+ result = Py_None;
+ Py_INCREF (result);
+ }
+ return result;
+}
+
+/* Helper function for Type standard mapping methods. Returns a
+ Python object for field i of the type. "kind" specifies what to
+ return: the name of the field, a gdb.Field object corresponding to
+ the field, or a tuple consisting of field name and gdb.Field
+ object. */
+
+static PyObject *
+make_fielditem (struct type *type, int i, enum gdbpy_iter_kind kind)
+{
+ PyObject *item = NULL, *key = NULL, *value = NULL;
+
+ switch (kind)
+ {
+ case iter_items:
+ key = field_name (type, i);
+ if (key == NULL)
+ goto fail;
+ value = convert_field (type, i);
+ if (value == NULL)
+ goto fail;
+ item = PyTuple_New (2);
+ if (item == NULL)
+ goto fail;
+ PyTuple_SET_ITEM (item, 0, key);
+ PyTuple_SET_ITEM (item, 1, value);
+ break;
+ case iter_keys:
+ item = field_name (type, i);
+ break;
+ case iter_values:
+ item = convert_field (type, i);
+ break;
+ }
+ return item;
+
+ fail:
+ Py_XDECREF (key);
+ Py_XDECREF (value);
+ Py_XDECREF (item);
+ return NULL;
+}
+
+/* Return a sequence of all field names, fields, or (name, field) pairs.
+ Each field is a gdb.Field object. */
+
+static PyObject *
+typy_fields_items (PyObject *self, enum gdbpy_iter_kind kind)
+{
+ PyObject *result = NULL, *item = NULL;
int i;
struct type *type = ((type_object *) self)->type;
volatile struct gdb_exception except;
@@ -230,26 +305,50 @@
then memoize the result (and perhaps make Field.type() lazy).
However, that can lead to cycles. */
result = PyList_New (0);
-
+ if (result == NULL)
+ return NULL;
+
for (i = 0; i < TYPE_NFIELDS (type); ++i)
{
- PyObject *dict = convert_field (type, i);
-
- if (!dict)
- {
- Py_DECREF (result);
- return NULL;
- }
- if (PyList_Append (result, dict))
- {
- Py_DECREF (dict);
- Py_DECREF (result);
- return NULL;
- }
- Py_DECREF (dict);
+ item = make_fielditem (type, i, kind);
+ if (!item)
+ goto fail;
+ if (PyList_Append (result, item))
+ goto fail;
+ Py_DECREF (item);
}
return result;
+
+ fail:
+ Py_XDECREF (item);
+ Py_XDECREF (result);
+ return NULL;
+}
+
+/* Return a sequence of all fields. Each field is a gdb.Field object. */
+
+static PyObject *
+typy_fields (PyObject *self, PyObject *args)
+{
+ return typy_fields_items (self, iter_values);
+}
+
+/* Return a sequence of all field names. Each field is a gdb.Field object. */
+
+static PyObject *
+typy_field_names (PyObject *self, PyObject *args)
+{
+ return typy_fields_items (self, iter_keys);
+}
+
+/* Return a sequence of all (name, fields) pairs. Each field is a
+ gdb.Field object. */
+
+static PyObject *
+typy_items (PyObject *self, PyObject *args)
+{
+ return typy_fields_items (self, iter_items);
}
/* Return the type's tag, or None. */
@@ -1000,6 +1099,209 @@
type->ob_type->tp_free (type);
}
+/* Return number of fields ("length" of the field dictionary). */
+
+static Py_ssize_t
+typy_length (PyObject *self)
+{
+ struct type *type = ((type_object *) self)->type;
+
+ return TYPE_NFIELDS (type);
+}
+
+/* Return a gdb.Field object for the field named by the argument. */
+
+static PyObject *
+typy_getitem (PyObject *self, PyObject *key)
+{
+ struct type *type = ((type_object *) self)->type;
+ char *field;
+ int i;
+
+ field = python_string_to_host_string (key);
+ if (field == NULL)
+ return NULL;
+
+ /* We want just fields of this type, not of base types, so instead of
+ using lookup_struct_elt_type, portions of that function are
+ copied here. */
+
+ for (;;)
+ {
+ CHECK_TYPEDEF (type);
+ if (TYPE_CODE (type) != TYPE_CODE_PTR
+ && TYPE_CODE (type) != TYPE_CODE_REF)
+ break;
+ type = TYPE_TARGET_TYPE (type);
+ }
+
+ for (i = 0; i < TYPE_NFIELDS (type); i++)
+ {
+ char *t_field_name = TYPE_FIELD_NAME (type, i);
+
+ if (t_field_name && (strcmp_iw (t_field_name, field) == 0))
+ {
+ return convert_field (type, i);
+ }
+ }
+ PyErr_SetObject (PyExc_KeyError, key);
+ return NULL;
+}
+
+/* Implement the "get" method on the type object. This is the
+ same as getitem if the key is present, but returns the supplied
+ default value or None if the key is not found. */
+
+static PyObject *
+typy_get (PyObject *self, PyObject *args)
+{
+ PyObject *key, *defval = Py_None, *result;
+
+ if (!PyArg_UnpackTuple (args, "get", 1, 2, &key, &defval))
+ return NULL;
+
+ result = typy_getitem (self, key);
+ if (result != NULL)
+ return result;
+
+ /* typy_getitem returned error status. If the exception is
+ KeyError, clear the exception status and return the defval
+ instead. Otherwise return the exception unchanged. */
+ if (!PyErr_ExceptionMatches (PyExc_KeyError))
+ return NULL;
+
+ PyErr_Clear ();
+ Py_INCREF (defval);
+ return defval;
+}
+
+/* Implement the "has_key" method on the type object. */
+
+static PyObject *
+typy_has_key (PyObject *self, PyObject *args)
+{
+ struct type *type = ((type_object *) self)->type;
+ char *field;
+ int i;
+
+ if (!PyArg_ParseTuple (args, "s", &field))
+ return NULL;
+
+ /* We want just fields of this type, not of base types, so instead of
+ using lookup_struct_elt_type, portions of that function are
+ copied here. */
+
+ for (;;)
+ {
+ CHECK_TYPEDEF (type);
+ if (TYPE_CODE (type) != TYPE_CODE_PTR
+ && TYPE_CODE (type) != TYPE_CODE_REF)
+ break;
+ type = TYPE_TARGET_TYPE (type);
+ }
+
+ for (i = 0; i < TYPE_NFIELDS (type); i++)
+ {
+ char *t_field_name = TYPE_FIELD_NAME (type, i);
+
+ if (t_field_name && (strcmp_iw (t_field_name, field) == 0))
+ Py_RETURN_TRUE;
+ }
+ Py_RETURN_FALSE;
+}
+
+/* Make an iterator object to iterate over keys, values, or items. */
+
+static PyObject *
+typy_make_iter (PyObject *self, enum gdbpy_iter_kind kind)
+{
+ typy_iterator_object *typy_iter_obj;
+
+ typy_iter_obj = PyObject_New (typy_iterator_object,
+ &type_iterator_object_type);
+ if (typy_iter_obj == NULL)
+ return NULL;
+
+ typy_iter_obj->field = 0;
+ typy_iter_obj->kind = kind;
+ Py_INCREF (self);
+ typy_iter_obj->source = (type_object *) self;
+
+ return (PyObject *) typy_iter_obj;
+}
+
+/* iteritems() method. */
+
+static PyObject *
+typy_iteritems (PyObject *self, PyObject *args)
+{
+ return typy_make_iter (self, iter_items);
+}
+
+/* iterkeys() method. */
+
+static PyObject *
+typy_iterkeys (PyObject *self, PyObject *args)
+{
+ return typy_make_iter (self, iter_keys);
+}
+
+/* Iterating over the class, same as iterkeys except for the function
+ signature. */
+
+static PyObject *
+typy_iter (PyObject *self)
+{
+ return typy_make_iter (self, iter_keys);
+}
+
+/* itervalues() method. */
+
+static PyObject *
+typy_itervalues (PyObject *self, PyObject *args)
+{
+ return typy_make_iter (self, iter_values);
+}
+
+/* Return a reference to the type iterator. */
+
+static PyObject *
+typy_iterator_iter (PyObject *self)
+{
+ Py_INCREF (self);
+ return self;
+}
+
+/* Return the next field in the iteration through the list of fields
+ of the type. */
+
+static PyObject *
+typy_iterator_iternext (PyObject *self)
+{
+ typy_iterator_object *iter_obj = (typy_iterator_object *) self;
+ struct type *type = iter_obj->source->type;
+ int i;
+ PyObject *result;
+
+ if (iter_obj->field < TYPE_NFIELDS (type))
+ {
+ result = make_fielditem (type, iter_obj->field, iter_obj->kind);
+ if (result != NULL)
+ iter_obj->field++;
+ return result;
+ }
+
+ return NULL;
+}
+
+static void
+typy_iterator_dealloc (PyObject *obj)
+{
+ typy_iterator_object *iter_obj = (typy_iterator_object *) obj;
+
+ Py_DECREF (iter_obj->source);
+}
+
/* Create a new Type referring to TYPE. */
PyObject *
type_to_type_object (struct type *type)
@@ -1067,6 +1369,8 @@
return;
if (PyType_Ready (&field_object_type) < 0)
return;
+ if (PyType_Ready (&type_iterator_object_type) < 0)
+ return;
for (i = 0; pyty_codes[i].name; ++i)
{
@@ -1080,6 +1384,10 @@
Py_INCREF (&type_object_type);
PyModule_AddObject (gdb_module, "Type", (PyObject *) &type_object_type);
+ Py_INCREF (&type_iterator_object_type);
+ PyModule_AddObject (gdb_module, "TypeIterator",
+ (PyObject *) &type_iterator_object_type);
+
Py_INCREF (&field_object_type);
PyModule_AddObject (gdb_module, "Field", (PyObject *) &field_object_type);
}
@@ -1102,13 +1410,35 @@
{ "array", typy_array, METH_VARARGS,
"array (N) -> Type\n\
Return a type which represents an array of N objects of this type." },
+ { "__contains__", typy_has_key, METH_VARARGS,
+ "T.__contains__(k) -> True if T has a field named k, else False" },
{ "const", typy_const, METH_NOARGS,
"const () -> Type\n\
Return a const variant of this type." },
{ "fields", typy_fields, METH_NOARGS,
- "field () -> list\n\
-Return a sequence holding all the fields of this type.\n\
-Each field is a dictionary." },
+ "fields () -> list\n\
+Return a list holding all the fields of this type.\n\
+Each field is a gdb.Field object." },
+ { "get", typy_get, METH_VARARGS,
+ "T.get(k[,default]) -> returns field named k in T, if it exists;\n\
+otherwise returns default, if supplied, or None if not." },
+ { "has_key", typy_has_key, METH_VARARGS,
+ "T.has_key(k) -> True if T has a field named k, else False" },
+ { "items", typy_items, METH_NOARGS,
+ "items () -> list\n\
+Return a list of (name, field) pairs of this type.\n\
+Each field is a gdb.Field object." },
+ { "iteritems", typy_iteritems, METH_NOARGS,
+ "iteritems () -> an iterator over the (name, field)\n\
+pairs of this type. Each field is a gdb.Field object." },
+ { "iterkeys", typy_iterkeys, METH_NOARGS,
+ "iterkeys () -> an iterator over the field names of this type." },
+ { "itervalues", typy_itervalues, METH_NOARGS,
+ "itervalues () -> an iterator over the fields of this type.\n\
+Each field is a gdb.Field object." },
+ { "keys", typy_field_names, METH_NOARGS,
+ "keys () -> list\n\
+Return a list holding all the fields names of this type." },
{ "pointer", typy_pointer, METH_NOARGS,
"pointer () -> Type\n\
Return a type of pointer to this type." },
@@ -1130,12 +1460,22 @@
{ "unqualified", typy_unqualified, METH_NOARGS,
"unqualified () -> Type\n\
Return a variant of this type without const or volatile attributes." },
+ { "values", typy_fields, METH_NOARGS,
+ "values () -> list\n\
+Return a list holding all the fields of this type.\n\
+Each field is a gdb.Field object." },
{ "volatile", typy_volatile, METH_NOARGS,
"volatile () -> Type\n\
Return a volatile variant of this type" },
{ NULL }
};
+static PyMappingMethods typy_mapping = {
+ typy_length,
+ typy_getitem,
+ NULL /* no "set" method */
+};
+
static PyTypeObject type_object_type =
{
PyObject_HEAD_INIT (NULL)
@@ -1151,7 +1491,7 @@
0, /*tp_repr*/
0, /*tp_as_number*/
0, /*tp_as_sequence*/
- 0, /*tp_as_mapping*/
+ &typy_mapping, /*tp_as_mapping*/
0, /*tp_hash */
0, /*tp_call*/
typy_str, /*tp_str*/
@@ -1164,7 +1504,7 @@
0, /* tp_clear */
typy_richcompare, /* tp_richcompare */
0, /* tp_weaklistoffset */
- 0, /* tp_iter */
+ typy_iter, /* tp_iter */
0, /* tp_iternext */
type_object_methods, /* tp_methods */
0, /* tp_members */
@@ -1221,3 +1561,35 @@
0, /* tp_alloc */
0, /* tp_new */
};
+
+static PyTypeObject type_iterator_object_type = {
+ PyObject_HEAD_INIT (NULL)
+ 0, /*ob_size*/
+ "gdb.TypeIterator", /*tp_name*/
+ sizeof (typy_iterator_object), /*tp_basicsize*/
+ 0, /*tp_itemsize*/
+ typy_iterator_dealloc, /*tp_dealloc*/
+ 0, /*tp_print*/
+ 0, /*tp_getattr*/
+ 0, /*tp_setattr*/
+ 0, /*tp_compare*/
+ 0, /*tp_repr*/
+ 0, /*tp_as_number*/
+ 0, /*tp_as_sequence*/
+ 0, /*tp_as_mapping*/
+ 0, /*tp_hash */
+ 0, /*tp_call*/
+ 0, /*tp_str*/
+ 0, /*tp_getattro*/
+ 0, /*tp_setattro*/
+ 0, /*tp_as_buffer*/
+ Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_ITER, /*tp_flags*/
+ "GDB type iterator object", /*tp_doc */
+ 0, /*tp_traverse */
+ 0, /*tp_clear */
+ 0, /*tp_richcompare */
+ 0, /*tp_weaklistoffset */
+ typy_iterator_iter, /*tp_iter */
+ typy_iterator_iternext, /*tp_iternext */
+ 0 /*tp_methods */
+};
Index: python/python-internal.h
===================================================================
RCS file: /cvs/src/src/gdb/python/python-internal.h,v
retrieving revision 1.48
diff -u -r1.48 python-internal.h
--- python/python-internal.h 15 Sep 2011 12:42:30 -0000 1.48
+++ python/python-internal.h 26 Sep 2011 15:54:34 -0000
@@ -104,6 +104,8 @@
#include "exceptions.h"
+enum gdbpy_iter_kind { iter_keys, iter_values, iter_items };
+
struct block;
struct value;
struct language_defn;
Index: testsuite/gdb.python/py-type.c
===================================================================
RCS file: /cvs/src/src/gdb/testsuite/gdb.python/py-type.c,v
retrieving revision 1.4
diff -u -r1.4 py-type.c
--- testsuite/gdb.python/py-type.c 1 Jan 2011 15:33:49 -0000 1.4
+++ testsuite/gdb.python/py-type.c 26 Sep 2011 15:54:34 -0000
@@ -43,6 +43,10 @@
#endif
+enum E
+{ v1, v2, v3
+};
+
int
main ()
{
@@ -56,9 +60,12 @@
d.e = 3;
d.f = 4;
#endif
-
+ enum E e;
+
st.a = 3;
st.b = 5;
+ e = v2;
+
return 0; /* break to inspect struct and array. */
}
Index: testsuite/gdb.python/py-type.exp
===================================================================
RCS file: /cvs/src/src/gdb/testsuite/gdb.python/py-type.exp,v
retrieving revision 1.13
diff -u -r1.13 py-type.exp
--- testsuite/gdb.python/py-type.exp 26 Jul 2011 18:38:55 -0000 1.13
+++ testsuite/gdb.python/py-type.exp 26 Sep 2011 15:54:34 -0000
@@ -86,6 +86,14 @@
gdb_test "python print fields\[0\].name" "a" "Check structure field a name"
gdb_test "python print fields\[1\].name" "b" "Check structure field b name"
+ # Test Python mapping behavior of gdb.Type for structs/classes
+ gdb_test "python print len(st.type)" "2" "Check number of fields"
+ gdb_test "python print st.type\['a'\].name" "a" "Check fields lookup by name"
+ gdb_test "python print \[v.bitpos for v in st.type.itervalues()\]" {\[0L, 32L\]} "Check fields iteration over values"
+ gdb_test "python print \[(n, v.bitpos) for (n, v) in st.type.items()\]" {\[\('a', 0L\), \('b', 32L\)\]} "Check fields items list"
+ gdb_test "python print 'a' in st.type" "True" "Check field name exists test"
+ gdb_test "python print 'nosuch' in st.type" "False" "Check field name nonexists test"
+
# Test regression PR python/10805
gdb_py_test_silent_cmd "print ar" "print value" 1
gdb_py_test_silent_cmd "python ar = gdb.history (0)" "get value from history" 1
@@ -101,6 +109,21 @@
gdb_test "python print ar\[0\].type == ar\[0\].type" "True"
}
+proc test_enums {} {
+ gdb_py_test_silent_cmd "print e" "print value" 1
+ gdb_py_test_silent_cmd "python e = gdb.history (0)" "get value from history" 1
+ gdb_py_test_silent_cmd "python fields = e.type.fields()" "get value from history" 1
+ gdb_test "python print len(fields)" "3" "Check the number of enum fields"
+ gdb_test "python print fields\[0\].name" "v1" "Check enum field name"
+ gdb_test "python print fields\[1\].name" "v2" "Check enum field name"
+
+ # Ditto but by mapping operations
+ gdb_test "python print len(e.type)" "3" "Check the number of enum fields"
+ gdb_test "python print e.type\['v1'\].name" "v1" "Check enum field lookup by name"
+ gdb_test "python print e.type\['v3'\].name" "v3" "Check enum field lookup by name"
+ gdb_test "python print \[v.bitpos for v in e.type.itervalues()\]" {\[0L, 1L, 2L\]} "Check num fields iteration over values"
+ gdb_test "python print \[(n, v.bitpos) for (n, v) in e.type.items()\]" {\[\('v1', 0L\), \('v2', 1L\), \('v3', 2L\)\]} "Check enum fields items list"
+}
proc test_base_class {} {
gdb_py_test_silent_cmd "print d" "print value" 1
gdb_py_test_silent_cmd "python d = gdb.history (0)" "get value from history" 1
@@ -169,6 +192,7 @@
runto_bp "break to inspect struct and array."
test_fields "c"
+test_enums
# Perform C++ Tests.
build_inferior "${binfile}-cxx" "c++"
@@ -178,3 +202,4 @@
test_base_class
test_range
test_template
+test_enums