Author: Armin Rigo <ar...@tunes.org>
Branch:
Changeset: r1257:5494afe611a2
Date: 2013-05-30 18:16 +0200
http://bitbucket.org/cffi/cffi/changeset/5494afe611a2/
Log: Failing tests for issue #82.
diff --git a/testing/test_ffi_backend.py b/testing/test_ffi_backend.py
--- a/testing/test_ffi_backend.py
+++ b/testing/test_ffi_backend.py
@@ -1,4 +1,4 @@
-import py
+import py, sys
from testing import backend_tests, test_function, test_ownlib
from cffi import FFI
import _cffi_backend
@@ -36,3 +36,52 @@
assert ffi.from_handle(p) is o
assert ffi.from_handle(ffi.cast("char *", p)) is o
py.test.raises(RuntimeError, ffi.from_handle, ffi.NULL)
+
+
+class TestBitfield:
+ def check(self, source, expected_ofs_y, expected_align, expected_size):
+ # verify the information with gcc
+ if sys.platform != "win32":
+ ffi1 = FFI()
+ ffi1.cdef("static const int Gofs_y, Galign, Gsize;")
+ 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)
+ """ % source)
+ assert lib.Gofs_y == expected_ofs_y
+ assert lib.Galign == expected_align
+ assert lib.Gsize == expected_size
+ # the real test follows
+ ffi = FFI()
+ ffi.cdef("struct s1 { %s };" % source)
+ assert ffi.offsetof("struct s1", "y") == expected_ofs_y
+ assert ffi.alignof("struct s1") == expected_align
+ assert ffi.sizeof("struct s1") == expected_size
+
+ def test_bitfield_basic(self):
+ self.check("int a; int b:9; int c:20; int y;", 8, 4, 12)
+ self.check("int a; short b:9; short c:7; int y;", 8, 4, 12)
+ self.check("int a; short b:9; short c:9; int y;", 8, 4, 12)
+
+ def test_bitfield_reuse_if_enough_space(self):
+ self.check("char a; int b:9; char y;", 3, 4, 4)
+ self.check("char a; short b:9; char y;", 4, 2, 6)
+
+ def test_bitfield_anonymous_no_align(self):
+ L = FFI().alignof("long long")
+ self.check("char x; int z:1; char y;", 2, 4, 4)
+ self.check("char x; int :1; char y;", 2, 1, 3)
+ self.check("char x; long long z:48; char y;", 7, L, 8)
+ self.check("char x; long long :48; char y;", 7, 1, 8)
+ self.check("char x; long long z:56; char y;", 8, L, 8 + L)
+ self.check("char x; long long :56; char y;", 8, 1, 9)
+ self.check("char x; long long z:57; char y;", L + 8, L, L + 8 + L)
+ self.check("char x; long long :57; char y;", L + 8, 1, L + 9)
+
+ def test_bitfield_zero(self):
+ L = FFI().alignof("long long")
+ self.check("char x; int :0; char y;", 4, 1, 5)
+ self.check("char x; long long :0; char y;", L, 1, L + 1)
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