Do not require line number entry for undefined local variable.

This is a regression caused by r106792 and caught by gdb testsuite.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@107430 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/CodeGen/AsmPrinter/DwarfDebug.cpp b/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
index 50c0fea..5343ada 100644 (file)
--- a/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
+++ b/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
@@ -2690,10 +2690,12 @@ void DwarfDebug::beginFunction(const MachineFunction *MF) {
         DIVariable DV(MI->getOperand(MI->getNumOperands() - 1).getMetadata());
         if (!DV.Verify()) continue;
         // If DBG_VALUE is for a local variable then it needs a label.
-        if (DV.getTag() != dwarf::DW_TAG_arg_variable)
+        if (DV.getTag() != dwarf::DW_TAG_arg_variable 
+            && isDbgValueInUndefinedReg(MI) == false)
           InsnNeedsLabel.insert(MI);
         // DBG_VALUE for inlined functions argument needs a label.
-        else if (!DISubprogram(DV.getContext()).describes(MF->getFunction()))
+        else if (!DISubprogram(getDISubprogram(DV.getContext())).
+                 describes(MF->getFunction()))
           InsnNeedsLabel.insert(MI);
         // DBG_VALUE indicating argument location change needs a label.
         else if (isDbgValueInUndefinedReg(MI) == false && !ProcessedArgs.insert(DV))