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import sys
from pypy.module._rawffi.structure import size_alignment_pos
from pypy.module._rawffi.interp_rawffi import TYPEMAP, letter2tp
sizeof = lambda x : size_alignment_pos(x)[0]
def unpack(desc):
return [('x', letter2tp('space', i), 0) for i in desc]
def test_sizeof():
s_c = sizeof(unpack('c'))
s_l = sizeof(unpack('l'))
s_q = sizeof(unpack('q'))
alignment_of_q = TYPEMAP['q'].c_alignment
assert alignment_of_q >= 4
assert sizeof(unpack('cl')) == 2*s_l
assert sizeof(unpack('cq')) == alignment_of_q + s_q
assert sizeof(unpack('ccq')) == alignment_of_q + s_q
assert sizeof(unpack('cccq')) == alignment_of_q + s_q
assert sizeof(unpack('ccccq')) == alignment_of_q + s_q
assert sizeof(unpack('qc')) == s_q + alignment_of_q
assert sizeof(unpack('qcc')) == s_q + alignment_of_q
assert sizeof(unpack('qccc')) == s_q + alignment_of_q
assert sizeof(unpack('qcccc')) == s_q + alignment_of_q
def test_bitsizes():
fields = [("A", 'i', 1),
("B", 'i', 2),
("C", 'i', 3),
("D", 'i', 4),
("E", 'i', 5),
("F", 'i', 6),
("G", 'i', 7),
("H", 'i', 8),
("I", 'i', 9),
("M", 'h', 1),
("N", 'h', 2),
("O", 'h', 3),
("P", 'h', 4),
("Q", 'h', 5),
("R", 'h', 6),
("S", 'h', 7)]
size, alignment, pos, bitsizes = size_alignment_pos(
[(name, letter2tp('space', t), size)
for (name, t, size) in fields])
assert size == 12
import ctypes
class X(ctypes.Structure):
_fields_ = [(name, {'i':ctypes.c_int, 'h': ctypes.c_short}[t], size)
for (name, t, size) in fields]
assert pos == [getattr(X, name).offset for (name, _, _) in fields]
assert bitsizes == [getattr(X, name).size for (name, _, _) in fields]
def test_bitsizes_longlong():
fields = [("a", 'q', 1),
("b", 'q', 62),
("c", 'q', 1)]
size, alignment, pos, bitsizes = size_alignment_pos(
[(name, letter2tp('space', t), size)
for (name, t, size) in fields])
assert size == 8
assert pos == [0, 0, 0]
if sys.byteorder == 'little':
assert bitsizes == [0x10000, 0x3e0001, 0x1003f]
else:
assert bitsizes == [0x1003f, 0x3e0001, 0x10000]
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