From: Devang Patel <dpatel@apple.com>
Date: Mon, 24 May 2010 18:26:49 +0000 (+0000)
Subject: Do not emit line number entries for unknown debug values.
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=295cdf8b8293f31953bad9a4a9c0586e934181c6;p=oota-llvm.git

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 9af5256af0b..145bf718f9b 100644
--- 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;