def test_struct_fields(self):
longsize = 4 if IS_32_BIT else 8
POINT = lltype.Struct('POINT',
('x', rffi.LONG),
('y', rffi.SHORT),
('z', rffi.VOIDP),
)
y_ofs = longsize
z_ofs = longsize*2
p = lltype.malloc(POINT, flavor='raw')
p.x = 42
p.y = rffi.cast(rffi.SHORT, -1)
p.z = rffi.cast(rffi.VOIDP, 0x1234)
addr = rffi.cast(rffi.VOIDP, p)
assert struct_getfield_int(types.slong, addr, 0) == 42
assert struct_getfield_int(types.sshort, addr, y_ofs) == -1
assert struct_getfield_int(types.pointer, addr, z_ofs) == 0x1234
#
struct_setfield_int(types.slong, addr, 0, 43)
struct_setfield_int(types.sshort, addr, y_ofs, 0x1234FFFE) # 0x1234 is masked out
struct_setfield_int(types.pointer, addr, z_ofs, 0x4321)
assert p.x == 43
assert p.y == -2
assert rffi.cast(rffi.LONG, p.z) == 0x4321
#
lltype.free(p, flavor='raw')
def test_struct_fields(self):
longsize = 4 if IS_32_BIT else 8
POINT = lltype.Struct(
'POINT',
('x', rffi.LONG),
('y', rffi.SHORT),
('z', rffi.VOIDP),
)
y_ofs = longsize
z_ofs = longsize * 2
p = lltype.malloc(POINT, flavor='raw')
p.x = 42
p.y = rffi.cast(rffi.SHORT, -1)
p.z = rffi.cast(rffi.VOIDP, 0x1234)
addr = rffi.cast(rffi.VOIDP, p)
assert struct_getfield_int(types.slong, addr, 0) == 42
assert struct_getfield_int(types.sshort, addr, y_ofs) == -1
assert struct_getfield_int(types.pointer, addr, z_ofs) == 0x1234
#
struct_setfield_int(types.slong, addr, 0, 43)
struct_setfield_int(types.sshort, addr, y_ofs,
0x1234FFFE) # 0x1234 is masked out
struct_setfield_int(types.pointer, addr, z_ofs, 0x4321)
assert p.x == 43
assert p.y == -2
assert rffi.cast(rffi.LONG, p.z) == 0x4321
#
lltype.free(p, flavor='raw')
def handle_unsigned(self, w_ffitype, w_obj, uintval):
libffi.struct_setfield_int(w_ffitype.get_ffitype(), self.rawmem, self.offset,
intmask(uintval))
def handle_unsigned(self, w_ffitype, w_obj, uintval):
libffi.struct_setfield_int(w_ffitype.get_ffitype(), self.rawmem,
self.offset, intmask(uintval))