Put something sane in the DWARF offset field for bitfield ObjC ivars.
This is useful because unnamed bitfields can have effects on the
offsets which are not otherwise reflected in the DWARF information.
<rdar://problem/12629719>
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@167503 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/CGDebugInfo.cpp b/lib/CodeGen/CGDebugInfo.cpp
index 7dfaaa4..80fa09b 100644
--- a/lib/CodeGen/CGDebugInfo.cpp
+++ b/lib/CodeGen/CGDebugInfo.cpp
@@ -15,6 +15,7 @@
#include "CodeGenFunction.h"
#include "CodeGenModule.h"
#include "CGBlocks.h"
+#include "CGObjCRuntime.h"
#include "clang/AST/ASTContext.h"
#include "clang/AST/DeclFriend.h"
#include "clang/AST/DeclObjC.h"
@@ -1412,12 +1413,21 @@
FieldAlign = CGM.getContext().getTypeAlign(FType);
}
- // We can't know the offset of our ivar in the structure if we're using
- // the non-fragile abi and the debugger should ignore the value anyways.
- // Call it the FieldNo+1 due to how debuggers use the information,
- // e.g. negating the value when it needs a lookup in the dynamic table.
- uint64_t FieldOffset = CGM.getLangOpts().ObjCRuntime.isNonFragile()
- ? FieldNo+1 : RL.getFieldOffset(FieldNo);
+ uint64_t FieldOffset;
+ if (CGM.getLangOpts().ObjCRuntime.isNonFragile()) {
+ // We don't know the runtime offset of an ivar if we're using the
+ // non-fragile ABI. For bitfields, use the bit offset into the first
+ // byte of storage of the bitfield. For other fields, use zero.
+ if (Field->isBitField()) {
+ FieldOffset = CGM.getObjCRuntime().ComputeBitfieldBitOffset(
+ CGM, ID, Field);
+ FieldOffset %= CGM.getContext().getCharWidth();
+ } else {
+ FieldOffset = 0;
+ }
+ } else {
+ FieldOffset = RL.getFieldOffset(FieldNo);
+ }
unsigned Flags = 0;
if (Field->getAccessControl() == ObjCIvarDecl::Protected)