Do not emit line number entries for unknown debug values.

This fixes recent regression in store.exp from gdb testsuite.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@104524 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/CodeGen/AsmPrinter/DwarfDebug.cpp b/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
index 9af5256af0b6d548eaeb96a44378274bb04b80c8..145bf718f9b2dba3dd858e8d5536c33da3d998cf 100644 (file)
--- a/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
+++ b/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
@@ -2195,6 +2195,9 @@ void DwarfDebug::beginScope(const MachineInstr *MI) {
     if (!DV.Verify()) return;
     if (DV.getTag() != dwarf::DW_TAG_arg_variable)
       LocalVar = true;
+    // Ignore Undef values.
+    if (MI->getOperand(0).isReg() && !MI->getOperand(0).getReg())
+      LocalVar = false;
   }
 
   MCSymbol *Label = NULL;