def test_alignment_of_longlong():
ffi = FFI()
x1 = ffi.alignof('unsigned long long')
assert x1 in [4, 8]
ffi.cdef("struct foo_s { unsigned long long x; };")
lib = verify(ffi, 'test_alignment_of_longlong',
"struct foo_s { unsigned long long x; };")
assert ffi.alignof('unsigned long long') == x1
assert ffi.alignof('struct foo_s') == x1
def test_alignment_of_longlong():
ffi = FFI()
x1 = ffi.alignof('unsigned long long')
assert x1 in [4, 8]
ffi.cdef("struct foo_s { unsigned long long x; };")
lib = verify(ffi, 'test_alignment_of_longlong',
"struct foo_s { unsigned long long x; };")
assert ffi.alignof('unsigned long long') == x1
assert ffi.alignof('struct foo_s') == x1
def check(self, source, expected_ofs_y, expected_align, expected_size):
# NOTE: 'expected_*' is the numbers expected from GCC.
# The numbers expected from MSVC are not explicitly written
# in this file, and will just be taken from the compiler.
ffi = FFI()
ffi.cdef("struct s1 { %s };" % source)
ctype = ffi.typeof("struct s1")
# verify the information with gcc
ffi1 = FFI()
ffi1.cdef(
"""
static const int Gofs_y, Galign, Gsize;
struct s1 *try_with_value(int fieldnum, long long value);
"""
)
fnames = [name for name, cfield in ctype.fields if name and cfield.bitsize > 0]
setters = ["case %d: s.%s = value; break;" % iname for iname in enumerate(fnames)]
lib = ffi1.verify(
"""
struct s1 { %s };
struct sa { char a; struct s1 b; };
#define Gofs_y offsetof(struct s1, y)
#define Galign offsetof(struct sa, b)
#define Gsize sizeof(struct s1)
struct s1 *try_with_value(int fieldnum, long long value)
{
static struct s1 s;
memset(&s, 0, sizeof(s));
switch (fieldnum) { %s }
return &s;
}
"""
% (source, " ".join(setters))
)
if sys.platform == "win32":
expected_ofs_y = lib.Gofs_y
expected_align = lib.Galign
expected_size = lib.Gsize
else:
assert (lib.Gofs_y, lib.Galign, lib.Gsize) == (expected_ofs_y, expected_align, expected_size)
# the real test follows
assert ffi.offsetof("struct s1", "y") == expected_ofs_y
assert ffi.alignof("struct s1") == expected_align
assert ffi.sizeof("struct s1") == expected_size
# compare the actual storage of the two
for name, cfield in ctype.fields:
if cfield.bitsize < 0 or not name:
continue
if int(ffi.cast(cfield.type, -1)) == -1: # signed
min_value = -(1 << (cfield.bitsize - 1))
max_value = (1 << (cfield.bitsize - 1)) - 1
else:
min_value = 0
max_value = (1 << cfield.bitsize) - 1
for t in [1, 2, 4, 8, 16, 128, 2813, 89728, 981729, -1, -2, -4, -8, -16, -128, -2813, -89728, -981729]:
if min_value <= t <= max_value:
self._fieldcheck(ffi, lib, fnames, name, t)
def check(self, source, expected_ofs_y, expected_align, expected_size):
# NOTE: 'expected_*' is the numbers expected from GCC.
# The numbers expected from MSVC are not explicitly written
# in this file, and will just be taken from the compiler.
ffi = FFI()
ffi.cdef("struct s1 { %s };" % source)
ctype = ffi.typeof("struct s1")
# verify the information with gcc
ffi1 = FFI()
ffi1.cdef("""
static const int Gofs_y, Galign, Gsize;
struct s1 *try_with_value(int fieldnum, long long value);
""")
fnames = [name for name, cfield in ctype.fields
if name and cfield.bitsize > 0]
setters = ['case %d: s.%s = value; break;' % iname
for iname in enumerate(fnames)]
lib = ffi1.verify("""
struct s1 { %s };
struct sa { char a; struct s1 b; };
#define Gofs_y offsetof(struct s1, y)
#define Galign offsetof(struct sa, b)
#define Gsize sizeof(struct s1)
struct s1 *try_with_value(int fieldnum, long long value)
{
static struct s1 s;
memset(&s, 0, sizeof(s));
switch (fieldnum) { %s }
return &s;
}
""" % (source, ' '.join(setters)))
if sys.platform == 'win32':
expected_ofs_y = lib.Gofs_y
expected_align = lib.Galign
expected_size = lib.Gsize
else:
assert (lib.Gofs_y, lib.Galign, lib.Gsize) == (
expected_ofs_y, expected_align, expected_size)
# the real test follows
assert ffi.offsetof("struct s1", "y") == expected_ofs_y
assert ffi.alignof("struct s1") == expected_align
assert ffi.sizeof("struct s1") == expected_size
# compare the actual storage of the two
for name, cfield in ctype.fields:
if cfield.bitsize < 0 or not name:
continue
if int(ffi.cast(cfield.type, -1)) == -1: # signed
min_value = -(1 << (cfield.bitsize-1))
max_value = (1 << (cfield.bitsize-1)) - 1
else:
min_value = 0
max_value = (1 << cfield.bitsize) - 1
for t in [1, 2, 4, 8, 16, 128, 2813, 89728, 981729,
-1,-2,-4,-8,-16,-128,-2813,-89728,-981729]:
if min_value <= t <= max_value:
self._fieldcheck(ffi, lib, fnames, name, t)
def test_include_5():
ffi1 = FFI()
ffi1.cdef("typedef struct { int x[2]; int y; } *mystruct_p;")
verify(ffi1, "test_include_5_parent",
"typedef struct { int x[2]; int y; } *mystruct_p;")
ffi = FFI()
ffi.include(ffi1)
ffi.cdef("mystruct_p ff5(mystruct_p);")
lib = verify(ffi, "test_include_5",
"typedef struct {int x[2]; int y; } *mystruct_p; //usually #include\n"
"mystruct_p ff5(mystruct_p p) { p->x[1] += 42; return p; }")
assert ffi.alignof(ffi.typeof("mystruct_p").item) == 4
assert ffi1.typeof("mystruct_p") is ffi.typeof("mystruct_p")
p = ffi.new("mystruct_p", [[5, 10], -17])
q = lib.ff5(p)
assert q == p
assert p.x[0] == 5
assert p.x[1] == 52
assert p.y == -17
assert ffi.alignof(ffi.typeof(p[0])) == 4
def test_include_5():
ffi1 = FFI()
ffi1.cdef("typedef struct { int x[2]; int y; } *mystruct_p;")
verify(ffi1, "test_include_5_parent",
"typedef struct { int x[2]; int y; } *mystruct_p;")
ffi = FFI()
ffi.include(ffi1)
ffi.cdef("mystruct_p ff5(mystruct_p);")
lib = verify(ffi, "test_include_5",
"typedef struct {int x[2]; int y; } *mystruct_p; //usually #include\n"
"mystruct_p ff5(mystruct_p p) { p->x[1] += 42; return p; }")
assert ffi.alignof(ffi.typeof("mystruct_p").item) == 4
assert ffi1.typeof("mystruct_p") is ffi.typeof("mystruct_p")
p = ffi.new("mystruct_p", [[5, 10], -17])
q = lib.ff5(p)
assert q == p
assert p.x[0] == 5
assert p.x[1] == 52
assert p.y == -17
assert ffi.alignof(ffi.typeof(p[0])) == 4
def test_alignof():
ffi = FFI()
assert ffi.alignof("int[51]") == 4 # unicode literal
def test_alignof():
ffi = FFI()
assert ffi.alignof("int[51]") == 4 # unicode literal