[cfe-commits] r76847 - /cfe/trunk/lib/CodeGen/CGRecordLayoutBuilder.cpp

[Anders Carlsson]

Author: andersca
Date: Wed Jul 22 23:00:39 2009
New Revision: 76847

URL: http://llvm.org/viewvc/llvm-project?rev=76847&view=rev
Log:
Handle zero width bit fields in unions correctly (by ignoring them).

Modified:
    cfe/trunk/lib/CodeGen/CGRecordLayoutBuilder.cpp

Modified: cfe/trunk/lib/CodeGen/CGRecordLayoutBuilder.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/CodeGen/CGRecordLayoutBuilder.cpp?rev=76847&r1=76846&r2=76847&view=diff

==============================================================================
--- cfe/trunk/lib/CodeGen/CGRecordLayoutBuilder.cpp (original)
+++ cfe/trunk/lib/CodeGen/CGRecordLayoutBuilder.cpp Wed Jul 22 23:00:39 2009
@@ -160,6 +160,15 @@
        FieldEnd = D->field_end(); Field != FieldEnd; ++Field, ++FieldNo) {
     assert(Layout.getFieldOffset(FieldNo) == 0 && 
           "Union field offset did not start at the beginning of record!");
+
+    if (Field->isBitField()) {
+      uint64_t FieldSize = 
+        Field->getBitWidth()->EvaluateAsInt(Types.getContext()).getZExtValue();
+    
+      // Ignore zero sized bit fields.
+      if (FieldSize == 0)
+        continue;
+    }
     
     const llvm::Type *FieldTy = 
       Types.ConvertTypeForMemRecursive(Field->getType());