[codeview] Check for a DIExpression offset for local variables

Fixes inalloca parameters, which previously all pointed to the same
offset. Extend the test to use llvm-readobj so that we can test the
offset in a readable way.

llvm-svn: 302578

1 files changed, 4 insertions, 0 deletions

diff --git a/llvm/include/llvm/IR/DebugInfoMetadata.h b/llvm/include/llvm/IR/DebugInfoMetadata.h
index 0331d5229e7..36bc5ce91b6 100644
--- a/llvm/include/llvm/IR/DebugInfoMetadata.h
+++ b/llvm/include/llvm/IR/DebugInfoMetadata.h
@@ -2276,6 +2276,10 @@ public:
   /// Append \p Ops with operations to apply the \p Offset.
   static void appendOffset(SmallVectorImpl<uint64_t> &Ops, int64_t Offset);
 
+  /// If this is a constant offset, extract it. If there is no expression,
+  /// return true with an offset of zero.
+  bool extractIfOffset(int64_t &Offset) const;
+
   /// Constants for DIExpression::prepend.
   enum { NoDeref = false, WithDeref = true, WithStackValue = true };