Fix a bug that prevents global variables from having a DW_OP_deref.

For local variables the first DW_OP_deref is consumed by turning the
location kind into a memeory location, but that only makes sense for
values that are in a register to begin with, which cannot happen for
global variables that are attached to a symbol.

rdar://problem/39741860

llvm-svn: 330970

1 files changed, 3 insertions, 2 deletions

diff --git a/llvm/lib/CodeGen/AsmPrinter/DwarfCompileUnit.cpp b/llvm/lib/CodeGen/AsmPrinter/DwarfCompileUnit.cpp
index 2eb0157f1e0..d893db42006 100644
--- a/llvm/lib/CodeGen/AsmPrinter/DwarfCompileUnit.cpp
+++ b/llvm/lib/CodeGen/AsmPrinter/DwarfCompileUnit.cpp
@@ -230,8 +230,9 @@ DIE *DwarfCompileUnit::getOrCreateGlobalVariableDIE(
         addOpAddress(*Loc, Sym);
       }
     }
-    if (Expr)
-      DwarfExpr->addExpression(Expr);
+    // Global variables attached to symbols are memory locations.
+    DwarfExpr->setMemoryLocationKind();
+    DwarfExpr->addExpression(Expr);
   }
   if (Loc)
     addBlock(*VariableDIE, dwarf::DW_AT_location, DwarfExpr->finalize());