DWARF layout for bitfields is wrong when the bit offset is negative.

Some older versions of clang emitted bit offsets that were negative and these bitfields would have their bitfield-ness stripped off and it would cause a clang assertion in clang assertions were enabled. I updated the bitfield C test to make sure we don't regress.

<rdar://problem/21082998> 

llvm-svn: 267248

1 files changed, 8 insertions, 0 deletions

diff --git a/lldb/packages/Python/lldbsuite/test/lang/c/bitfields/TestBitfields.py b/lldb/packages/Python/lldbsuite/test/lang/c/bitfields/TestBitfields.py
index 60c1c0992d2..0afec0a3c1a 100644
--- a/lldb/packages/Python/lldbsuite/test/lang/c/bitfields/TestBitfields.py
+++ b/lldb/packages/Python/lldbsuite/test/lang/c/bitfields/TestBitfields.py
@@ -96,6 +96,14 @@ class BitfieldsTestCase(TestBase):
         self.expect("expr (more_bits.d)", VARIABLES_DISPLAYED_CORRECTLY,
             substrs = ['uint8_t', '\\0'])
 
+        self.expect("expr (packed.a)", VARIABLES_DISPLAYED_CORRECTLY, 
+            substrs = ['char', "'a'"])
+        self.expect("expr (packed.b)", VARIABLES_DISPLAYED_CORRECTLY, 
+            substrs = ['uint32_t', "10"])
+        self.expect("expr/x (packed.c)", VARIABLES_DISPLAYED_CORRECTLY, 
+            substrs = ['uint32_t', "7112233"])
+
+
     @add_test_categories(['pyapi'])
     @skipIfWindows # BitFields exhibit crashes in record layout on Windows (http://llvm.org/pr21800)
     def test_and_python_api(self):