def test_to_vtype_with_layout_with_one_field(self):
layout_to_convert = layout.Layout(
bit_size=32,
bit_alignment=16,
fields=[
layout.Field(bit_offset=0,
name='x',
layout=layout.Layout(
bit_size=32,
bit_alignment=16,
))
],
)
type_definition = c_ast.CStruct([
c_ast.CField(
name='x',
type_definition=c_ast.CTypeReference('some_type'),
),
])
self.type_description_visitor.get_description.return_value = (
'some_description')
actual = self.layout_to_vtype_converter.to_vtype(
layout_to_convert,
type_definition,
'some_types',
)
self.type_description_visitor.get_description.assert_called_with(
c_ast.CTypeReference('some_type'),
'some_types',
)
expected = [4, {'x': [0, 'some_description']}]
self.assertEqual(actual, expected)
def test_to_vtype_with_layout_with_bit_field(self):
layout_to_convert = layout.Layout(
bit_size=48,
bit_alignment=16,
fields=[
layout.Field(bit_offset=33,
name='x',
layout=layout.Layout(
bit_size=9,
bit_alignment=16,
bit_field=True,
))
],
)
type_definition = c_ast.CStruct([
c_ast.CField(
name='x',
type_definition=c_ast.CTypeReference('some_type'),
bit_size=9,
),
])
self.type_description_visitor.get_description.return_value = [
'some_type'
]
actual = self.layout_to_vtype_converter.to_vtype(
layout_to_convert,
type_definition,
'some_types',
)
self.type_description_visitor.get_description.assert_called_with(
c_ast.CTypeReference('some_type'),
'some_types',
)
expected = [
6,
{
'x': [
4,
[
'BitField', {
'start_bit': 1,
'end_bit': 10,
'target': 'some_type',
}
],
],
},
]
self.assertEqual(actual, expected)
def visit_c_union(self, union):
"""A method visiting a union definition and returing the layout.
Args:
union: an object representing a union definition in AST.
Returns:
An object representing the layout of the union.
"""
fields = self._field_collector.collect_fields(union.content)
packed = self._is_packed(union.attributes)
bit_alignment = self._get_attributes_alignment(union.attributes)
bit_size = 0
for field, type_definition in zip(fields, union.content):
if not packed or self._is_alignment_overriden(type_definition):
bit_alignment = self._lcm(bit_alignment,
field.layout.bit_alignment)
field.bit_offset = 0
bit_size = max(bit_size, field.layout.bit_size)
bit_size = self._align(bit_size, bit_alignment)
return layouts.Layout(
bit_size=bit_size,
bit_alignment=bit_alignment,
fields=fields,
)
def visit_c_struct(self, struct):
"""A method visiting a struct definition and returing the layout.
Args:
struct: an object representing a struct definition in AST.
Returns:
An object representing the layout of the struct.
"""
fields = self._field_collector.collect_fields(struct.content)
packed = self._is_packed(struct.attributes)
bit_alignment = self._get_attributes_alignment(struct.attributes)
bit_offset = 0
for field, type_definition in zip(fields, struct.content):
bit_offset = self._align_field(
bit_offset,
field.layout,
type_definition,
packed,
)
if not packed or self._is_alignment_overriden(type_definition):
bit_alignment = self._lcm(bit_alignment,
field.layout.bit_alignment)
field.bit_offset = bit_offset
bit_offset += field.layout.bit_size
bit_size = self._align(bit_offset, bit_alignment)
return layouts.Layout(
bit_size=bit_size,
bit_alignment=bit_alignment,
fields=fields,
)
def visit_c_pointer(self, pointer):
_ = pointer
return layouts.Layout(
bit_size=self._pointer_bit_size(),
bit_alignment=self._pointer_bit_alignment(),
fields=[],
)
def test_to_vtype_with_layout_with_no_fields(self):
layout_to_convert = layout.Layout(
bit_size=40,
bit_alignment=16,
fields=[],
)
type_definition = c_ast.CStruct([])
actual = self.layout_to_vtype_converter.to_vtype(
layout_to_convert,
type_definition,
'some_types',
)
expected = [5, {}]
self.assertEqual(actual, expected)
def visit_c_simple_type(self, simple_type):
return layouts.Layout(
bit_size=simple_type.bit_size,
bit_alignment=simple_type.bit_alignment,
fields=[],
)
def test_to_vtype_with_layout_with_three_fields(self):
layout_to_convert = layout.Layout(
bit_size=48,
bit_alignment=32,
fields=[
layout.Field(bit_offset=0,
name='x',
layout=layout.Layout(
bit_size=16,
bit_alignment=8,
)),
layout.Field(bit_offset=16,
name='y',
layout=layout.Layout(
bit_size=8,
bit_alignment=32,
)),
layout.Field(bit_offset=24,
name='z',
layout=layout.Layout(
bit_size=24,
bit_alignment=16,
)),
],
)
some_type = c_ast.CTypeReference('some_type')
some_other_type = c_ast.CTypeReference('some_other_type')
type_definition = c_ast.CStruct([
c_ast.CField(
name='x',
type_definition=some_type,
),
c_ast.CField(
name='y',
type_definition=some_other_type,
),
c_ast.CField(
name='z',
type_definition=some_type,
),
])
self.type_description_visitor.get_description.side_effect = (
'some_description',
'some_other_description',
'some_description',
)
actual = self.layout_to_vtype_converter.to_vtype(
layout_to_convert,
type_definition,
'some_types',
)
expected_get_description_calls = [
mock.call(some_type, 'some_types'),
mock.call(some_other_type, 'some_types'),
mock.call(some_type, 'some_types'),
]
self.assertEqual(
self.type_description_visitor.get_description.call_args_list,
expected_get_description_calls,
)
expected = [
6, {
'x': [0, 'some_description'],
'y': [2, 'some_other_description'],
'z': [3, 'some_description'],
}
]
self.assertEqual(actual, expected)