How to use the drgn.typedef_type function in drgn

def test_typedef(self):
        type_ = typedef_type('SHORT', self.prog.type('short'))
        self.assertEqual(+Object(self.prog, type_, value=5),
                         Object(self.prog, 'int', value=5))

        # Typedef should be preserved if the type wasn't promoted.
        type_ = typedef_type('self.int', self.prog.type('int'))
        self.assertEqual(+Object(self.prog, type_, value=5),
                         Object(self.prog, type_, value=5))

# Qualified type argument.
        self.assertEqual(t, typedef_type(
            'INT', int_type('int', 4, True)))
        # Different name.
        self.assertNotEqual(t, typedef_type(
            'integer', int_type('int', 4, True)))
        # Different type.
        self.assertNotEqual(t, typedef_type(
            'integer', int_type('unsigned int', 4, False)))
        self.assertNotEqual(t, typedef_type(
            'INT', int_type('int', 4, True, Qualifiers.CONST)))

        self.assertEqual(repr(t), "typedef_type(name='INT', type=int_type(name='int', size=4, is_signed=True))")
        self.assertEqual(sizeof(t), 4)

        t = typedef_type('VOID', void_type())
        self.assertFalse(t.is_complete())

        self.assertRaises(TypeError, typedef_type, None,
                          int_type('int', 4, True))
        self.assertRaises(TypeError, typedef_type, 'INT', 4)

        self.assertEqual(
            typedef_type('size_t',
                         int_type('unsigned long', 8, False)).primitive,
            PrimitiveType.C_SIZE_T)
        self.assertEqual(
            typedef_type('ptrdiff_t', int_type('long', 8, True)).primitive,
            PrimitiveType.C_PTRDIFF_T)

point_type = struct_type('point', 8, (
    (int_type('int', 4, True), 'x', 0),
    (int_type('int', 4, True), 'y', 32),
))
line_segment_type = struct_type('line_segment', 16, (
    (point_type, 'a'),
    (point_type, 'b', 64),
))
option_type = union_type('option', 4, (
    (int_type('int', 4, True), 'i'),
    (float_type('float', 4), 'f'),
))
color_type = enum_type('color', int_type('unsigned int', 4, False),
                       (('RED', 0), ('GREEN', 1), ('BLUE', 2)))
pid_type = typedef_type('pid_t', int_type('int', 4, True))


def mock_type_index(word_size, types):
    def mock_type_index_find(kind, name, filename):
        if filename:
            return None
        for type in types:
            if type.kind == kind:
                try:
                    type_name = type.name
                except AttributeError:
                    try:
                        type_name = type.tag
                    except AttributeError:
                        continue
                if type_name == name:

def test_typedef(self):
        type_ = typedef_type('INT', self.prog.type('int'))
        self.assertCommonRealType(type_, type_, type_)
        self.assertCommonRealType('int', type_, type_, commutative=False)
        self.assertCommonRealType(type_, 'int', 'int', commutative=False)

        type_ = typedef_type('LONG', self.prog.type('long'))
        self.assertCommonRealType(type_, 'int', type_)

def test_void_typedef(self):
        dies = [
            DwarfDie(
                DW_TAG.typedef,
                [
                    DwarfAttrib(DW_AT.name, DW_FORM.string, 'VOID'),
                ],
            ),
        ]
        self.assertFromDwarf(dies, typedef_type('VOID', void_type()))

        dies[0].attribs.pop(0)
        self.assertRaisesRegex(Exception,
                               'DW_TAG_typedef has missing or invalid DW_AT_name',
                               self.type_from_dwarf, dies)

))
point_type = struct_type('point', 8, (
    (int_type('int', 4, True), 'x', 0),
    (int_type('int', 4, True), 'y', 32),
))
line_segment_type = struct_type('line_segment', 16, (
    (point_type, 'a'),
    (point_type, 'b', 64),
))
option_type = union_type('option', 4, (
    (int_type('int', 4, True), 'i'),
    (float_type('float', 4), 'f'),
))
color_type = enum_type('color', int_type('unsigned int', 4, False),
                       (('RED', 0), ('GREEN', 1), ('BLUE', 2)))
pid_type = typedef_type('pid_t', int_type('int', 4, True))


MOCK_32BIT_PLATFORM = Platform(Architecture.UNKNOWN,
                               PlatformFlags.IS_LITTLE_ENDIAN)
MOCK_PLATFORM = Platform(Architecture.UNKNOWN,
                         PlatformFlags.IS_64_BIT |
                         PlatformFlags.IS_LITTLE_ENDIAN)


class MockMemorySegment(NamedTuple):
    buf: bytes
    virt_addr: Optional[int] = None
    phys_addr: Optional[int] = None


def mock_memory_read(data, address, count, offset, physical):

),
            DwarfDie(
                DW_TAG.array_type,
                [DwarfAttrib(DW_AT.type, DW_FORM.ref4, 3)],
                [
                    DwarfDie(
                        DW_TAG.subrange_type,
                        [DwarfAttrib(DW_AT.count, DW_FORM.data1, 0)]
                    ),
                ],
            ),
            int_die,
        ]

        type_ = array_type(
            3, typedef_type('ZARRAY', array_type(0, int_type('int', 4, True))))
        self.assertFromDwarf(dies, type_)

        # GCC actually squashes arrays of typedef arrays into one array type,
        # but let's handle it like GCC < 9.0 anyways.
        del dies[2].children[0]
        self.assertFromDwarf(dies, type_)

def test_size_t_and_ptrdiff_t(self):
        # 64-bit architecture with 4-byte long/unsigned long.
        prog = mock_program(types=[
            int_type('long', 4, True),
            int_type('unsigned long', 4, False),
        ])
        self.assertEqual(prog.type('size_t'),
                         typedef_type('size_t', prog.type('unsigned long long')))
        self.assertEqual(prog.type('ptrdiff_t'),
                         typedef_type('ptrdiff_t', prog.type('long long')))

        # 32-bit architecture with 8-byte long/unsigned long.
        prog = mock_program(MOCK_32BIT_PLATFORM, types=[
            int_type('long', 8, True),
            int_type('unsigned long', 8, False),
        ])
        self.assertEqual(prog.type('size_t'),
                         typedef_type('size_t', prog.type('unsigned int')))
        self.assertEqual(prog.type('ptrdiff_t'),
                         typedef_type('ptrdiff_t', prog.type('int')))

        # Nonsense sizes.
        prog = mock_program(types=[
            int_type('int', 1, True),

def test_typedef(self):
        type_ = typedef_type('INT', int_type('int', 4, True))
        self.assertEqual(str(Object(self.prog, type_, value=99)), '(INT)99')

        type_ = typedef_type('INT', int_type('int', 4, True), Qualifiers.CONST)
        self.assertEqual(str(Object(self.prog, type_, value=99)), '(const INT)99')

        type_ = typedef_type(
            'CINT', int_type('int', 4, True, Qualifiers.CONST))
        self.assertEqual(str(Object(self.prog, type_, value=99)), '(CINT)99')