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import sys
from pypy.interpreter.gateway import interp2app, unwrap_spec
from pypy.module._rawffi.alt.interp_ffitype import app_types, W_FFIType
from pypy.module._rawffi.alt.interp_struct import compute_size_and_alignement, W_Field
from pypy.module._rawffi.alt.test.test_funcptr import BaseAppTestFFI
class TestStruct(object):
class FakeSpace(object):
def interp_w(self, cls, obj):
return obj
def compute(self, ffitypes_w):
fields_w = [W_Field('<dummy>', w_ffitype) for
w_ffitype in ffitypes_w]
return compute_size_and_alignement(self.FakeSpace(), fields_w)
def sizeof(self, ffitypes_w):
size, aligned, fields_w = self.compute(ffitypes_w)
return size
def test_compute_size(self):
T = app_types
byte_size = app_types.sbyte.sizeof()
long_size = app_types.slong.sizeof()
llong_size = app_types.slonglong.sizeof()
llong_align = app_types.slonglong.get_alignment()
#
assert llong_align >= 4
assert self.sizeof([T.sbyte, T.slong]) == 2*long_size
assert self.sizeof([T.sbyte, T.slonglong]) == llong_align + llong_size
assert self.sizeof([T.sbyte, T.sbyte, T.slonglong]) == llong_align + llong_size
assert self.sizeof([T.sbyte, T.sbyte, T.sbyte, T.slonglong]) == llong_align + llong_size
assert self.sizeof([T.sbyte, T.sbyte, T.sbyte, T.sbyte, T.slonglong]) == llong_align + llong_size
assert self.sizeof([T.slonglong, T.sbyte]) == llong_size + llong_align
assert self.sizeof([T.slonglong, T.sbyte, T.sbyte]) == llong_size + llong_align
assert self.sizeof([T.slonglong, T.sbyte, T.sbyte, T.sbyte]) == llong_size + llong_align
assert self.sizeof([T.slonglong, T.sbyte, T.sbyte, T.sbyte, T.sbyte]) == llong_size + llong_align
class AppTestStruct(BaseAppTestFFI):
@classmethod
def read_raw_mem(cls, addr, typename, length):
import ctypes
addr = ctypes.cast(addr, ctypes.c_void_p)
c_type = getattr(ctypes, typename)
array_type = ctypes.POINTER(c_type * length)
ptr_array = ctypes.cast(addr, array_type)
array = ptr_array[0]
lst = [array[i] for i in range(length)]
return lst
def setup_class(cls):
BaseAppTestFFI.setup_class.im_func(cls)
from rpython.rlib import clibffi
from rpython.rlib.rarithmetic import r_uint
from rpython.rtyper.lltypesystem import lltype, rffi
if cls.runappdirect:
cls.w_read_raw_mem = cls.read_raw_mem
else:
@unwrap_spec(addr=r_uint, typename='text', length=int)
def read_raw_mem_w(space, addr, typename, length):
return space.wrap(cls.read_raw_mem(addr, typename, length))
cls.w_read_raw_mem = cls.space.wrap(interp2app(read_raw_mem_w))
#
dummy_type = lltype.malloc(clibffi.FFI_TYPE_P.TO, flavor='raw')
dummy_type.c_size = r_uint(123)
dummy_type.c_alignment = rffi.cast(rffi.USHORT, 0)
dummy_type.c_type = rffi.cast(rffi.USHORT, 0)
cls.w_dummy_type = W_FFIType('dummy', dummy_type)
cls.w_runappdirect = cls.space.wrap(cls.runappdirect)
def test__StructDescr(self):
from _rawffi.alt import _StructDescr, Field, types
longsize = types.slong.sizeof()
fields = [
Field('x', types.slong),
Field('y', types.slong),
]
descr = _StructDescr('foo', fields)
assert descr.ffitype.sizeof() == longsize*2
assert descr.ffitype.name == 'struct foo'
def test_alignment(self):
from _rawffi.alt import _StructDescr, Field, types
longsize = types.slong.sizeof()
fields = [
Field('x', types.sbyte),
Field('y', types.slong),
]
descr = _StructDescr('foo', fields)
assert descr.ffitype.sizeof() == longsize*2
assert fields[0].offset == 0
assert fields[1].offset == longsize # aligned to WORD
def test_missing_field(self):
from _rawffi.alt import _StructDescr, Field, types
longsize = types.slong.sizeof()
fields = [
Field('x', types.slong),
Field('y', types.slong),
]
descr = _StructDescr('foo', fields)
struct = descr.allocate()
raises(AttributeError, "struct.getfield('missing')")
raises(AttributeError, "struct.setfield('missing', 42)")
def test_unknown_type(self):
if self.runappdirect:
skip('cannot use self.dummy_type with -A')
from _rawffi.alt import _StructDescr, Field
fields = [
Field('x', self.dummy_type),
]
descr = _StructDescr('foo', fields)
struct = descr.allocate()
raises(TypeError, "struct.getfield('x')")
raises(TypeError, "struct.setfield('x', 42)")
def test_getfield_setfield(self):
from _rawffi.alt import _StructDescr, Field, types
longsize = types.slong.sizeof()
fields = [
Field('x', types.slong),
Field('y', types.slong),
]
descr = _StructDescr('foo', fields)
struct = descr.allocate()
struct.setfield('x', 42)
struct.setfield('y', 43)
assert struct.getfield('x') == 42
assert struct.getfield('y') == 43
mem = self.read_raw_mem(struct.getaddr(), 'c_long', 2)
assert mem == [42, 43]
def test_getfield_setfield_signed_types(self):
import sys
from _rawffi.alt import _StructDescr, Field, types
if sys.platform == 'win32':
maxlong = 2 ** 31 - 1
else:
maxlong = sys.maxsize
fields = [
Field('sbyte', types.sbyte),
Field('sshort', types.sshort),
Field('sint', types.sint),
Field('slong', types.slong),
]
descr = _StructDescr('foo', fields)
struct = descr.allocate()
struct.setfield('sbyte', 128)
assert struct.getfield('sbyte') == -128
struct.setfield('sshort', 32768)
assert struct.getfield('sshort') == -32768
struct.setfield('sint', 43)
assert struct.getfield('sint') == 43
struct.setfield('slong', maxlong + 1)
assert struct.getfield('slong') == -maxlong - 1
struct.setfield('slong', maxlong * 3)
assert struct.getfield('slong') == maxlong - 2
def test_getfield_setfield_unsigned_types(self):
import sys
from _rawffi.alt import _StructDescr, Field, types
longsize = types.slong.sizeof()
if sys.platform == 'win32':
maxlong = 2 ** 31 - 1
else:
maxlong = sys.maxsize
fields = [
Field('ubyte', types.ubyte),
Field('ushort', types.ushort),
Field('uint', types.uint),
Field('ulong', types.ulong),
Field('char', types.char),
Field('unichar', types.unichar),
Field('ptr', types.void_p),
]
descr = _StructDescr('foo', fields)
struct = descr.allocate()
struct.setfield('ubyte', -1)
assert struct.getfield('ubyte') == 255
struct.setfield('ushort', -1)
assert struct.getfield('ushort') == 65535
struct.setfield('uint', 43)
assert struct.getfield('uint') == 43
struct.setfield('ulong', -1)
assert struct.getfield('ulong') == maxlong * 2 + 1
struct.setfield('ulong', maxlong * 2 + 2)
assert struct.getfield('ulong') == 0
struct.setfield('char', b'a')
assert struct.getfield('char') == b'a'
struct.setfield('unichar', u'\u1234')
assert struct.getfield('unichar') == u'\u1234'
struct.setfield('ptr', -1)
assert struct.getfield('ptr') == sys.maxsize * 2 + 1
def test_getfield_setfield_longlong(self):
import sys
from _rawffi.alt import _StructDescr, Field, types
fields = [
Field('slonglong', types.slonglong),
Field('ulonglong', types.ulonglong),
]
descr = _StructDescr('foo', fields)
struct = descr.allocate()
struct.setfield('slonglong', 9223372036854775808)
assert struct.getfield('slonglong') == -9223372036854775808
struct.setfield('ulonglong', -1)
assert struct.getfield('ulonglong') == 18446744073709551615
mem = self.read_raw_mem(struct.getaddr(), 'c_longlong', 2)
assert mem == [-9223372036854775808, -1]
def test_getfield_setfield_float(self):
import sys
from _rawffi.alt import _StructDescr, Field, types
fields = [
Field('x', types.double),
]
descr = _StructDescr('foo', fields)
struct = descr.allocate()
struct.setfield('x', 123.4)
assert struct.getfield('x') == 123.4
mem = self.read_raw_mem(struct.getaddr(), 'c_double', 1)
assert mem == [123.4]
def test_getfield_setfield_singlefloat(self):
import sys
from _rawffi.alt import _StructDescr, Field, types
fields = [
Field('x', types.float),
]
descr = _StructDescr('foo', fields)
struct = descr.allocate()
struct.setfield('x', 123.4) # this is a value which DOES loose
# precision in a single float
assert 0 < abs(struct.getfield('x') - 123.4) < 0.0001
#
struct.setfield('x', 123.5) # this is a value which does not loose
# precision in a single float
assert struct.getfield('x') == 123.5
mem = self.read_raw_mem(struct.getaddr(), 'c_float', 1)
assert mem == [123.5]
def test_define_fields(self):
from _rawffi.alt import _StructDescr, Field, types
longsize = types.slong.sizeof()
fields = [
Field('x', types.slong),
Field('y', types.slong),
]
descr = _StructDescr('foo')
assert descr.ffitype.name == 'struct foo'
assert repr(descr.ffitype) == '<ffi type struct foo (incomplete)>'
raises(ValueError, "descr.ffitype.sizeof()")
raises(ValueError, "descr.allocate()")
#
descr.define_fields(fields)
assert repr(descr.ffitype) == '<ffi type struct foo>'
assert descr.ffitype.sizeof() == longsize*2
raises(ValueError, "descr.define_fields(fields)")
def test_pointer_to_incomplete_struct(self):
from _rawffi.alt import _StructDescr, Field, types
fields = [
Field('x', types.slong),
Field('y', types.slong),
]
descr = _StructDescr('foo')
foo_ffitype = descr.ffitype
foo_p = types.Pointer(descr.ffitype)
assert foo_p.deref_pointer() is foo_ffitype
descr.define_fields(fields)
assert descr.ffitype is foo_ffitype
assert foo_p.deref_pointer() is foo_ffitype
assert types.Pointer(descr.ffitype) is foo_p
def test_nested_structure(self):
from _rawffi.alt import _StructDescr, Field, types
longsize = types.slong.sizeof()
foo_fields = [
Field('x', types.slong),
Field('y', types.slong),
]
foo_descr = _StructDescr('foo', foo_fields)
#
bar_fields = [
Field('x', types.slong),
Field('foo', foo_descr.ffitype),
]
bar_descr = _StructDescr('bar', bar_fields)
assert bar_descr.ffitype.sizeof() == longsize*3
#
struct = bar_descr.allocate()
struct.setfield('x', 40)
# reading a nested structure yields a reference to it
struct_foo = struct.getfield('foo')
struct_foo.setfield('x', 41)
struct_foo.setfield('y', 42)
mem = self.read_raw_mem(struct.getaddr(), 'c_long', 3)
assert mem == [40, 41, 42]
#
struct_foo2 = foo_descr.allocate()
struct_foo2.setfield('x', 141)
struct_foo2.setfield('y', 142)
# writing a nested structure copies its memory into the target
struct.setfield('foo', struct_foo2)
struct_foo2.setfield('x', 241)
struct_foo2.setfield('y', 242)
mem = self.read_raw_mem(struct.getaddr(), 'c_long', 3)
assert mem == [40, 141, 142]
mem = self.read_raw_mem(struct_foo2.getaddr(), 'c_long', 2)
assert mem == [241, 242]
def test_compute_shape(self):
from _rawffi.alt import Structure, Field, types
class Point(Structure):
_fields_ = [
Field('x', types.slong),
Field('y', types.slong),
]
longsize = types.slong.sizeof()
assert isinstance(Point.x, Field)
assert isinstance(Point.y, Field)
assert Point.x.offset == 0
assert Point.y.offset == longsize
assert Point._struct_.ffitype.sizeof() == longsize*2
assert Point._struct_.ffitype.name == 'struct Point'
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