diff --git a/include/llvm/CodeGen/SelectionDAG.h b/include/llvm/CodeGen/SelectionDAG.h
index 8962bee..a96fa7e 100644
--- a/include/llvm/CodeGen/SelectionDAG.h
+++ b/include/llvm/CodeGen/SelectionDAG.h
@@ -29,7 +29,6 @@
 namespace llvm {
 
 class AliasAnalysis;
-class DwarfWriter;
 class FunctionLoweringInfo;
 class MachineConstantPoolValue;
 class MachineFunction;
@@ -123,7 +122,6 @@
   MachineFunction *MF;
   FunctionLoweringInfo &FLI;
   MachineModuleInfo *MMI;
-  DwarfWriter *DW;
   LLVMContext* Context;
 
   /// EntryNode - The starting token.
@@ -182,7 +180,7 @@
   /// init - Prepare this SelectionDAG to process code in the given
   /// MachineFunction.
   ///
-  void init(MachineFunction &mf, MachineModuleInfo *mmi, DwarfWriter *dw);
+  void init(MachineFunction &mf, MachineModuleInfo *mmi);
 
   /// clear - Clear state and free memory necessary to make this
   /// SelectionDAG ready to process a new block.
@@ -194,7 +192,6 @@
   TargetLowering &getTargetLoweringInfo() const { return TLI; }
   FunctionLoweringInfo &getFunctionLoweringInfo() const { return FLI; }
   MachineModuleInfo *getMachineModuleInfo() const { return MMI; }
-  DwarfWriter *getDwarfWriter() const { return DW; }
   LLVMContext *getContext() const {return Context; }
 
   /// viewGraph - Pop up a GraphViz/gv window with the DAG rendered using 'dot'.
diff --git a/lib/CodeGen/SelectionDAG/SelectionDAG.cpp b/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
index 7291c5a..7dea29c 100644
--- a/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
+++ b/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
@@ -793,7 +793,7 @@
 
 // EntryNode could meaningfully have debug info if we can find it...
 SelectionDAG::SelectionDAG(TargetLowering &tli, FunctionLoweringInfo &fli)
-  : TLI(tli), FLI(fli), DW(0),
+  : TLI(tli), FLI(fli),
     EntryNode(ISD::EntryToken, DebugLoc(), getVTList(MVT::Other)),
     Root(getEntryNode()), Ordering(0) {
   AllNodes.push_back(&EntryNode);
@@ -801,11 +801,9 @@
   DbgInfo = new SDDbgInfo();
 }
 
-void SelectionDAG::init(MachineFunction &mf, MachineModuleInfo *mmi,
-                        DwarfWriter *dw) {
+void SelectionDAG::init(MachineFunction &mf, MachineModuleInfo *mmi) {
   MF = &mf;
   MMI = mmi;
-  DW = dw;
   Context = &mf.getFunction()->getContext();
 }
 
diff --git a/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp b/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
index b06239f..049550b 100644
--- a/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
+++ b/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
@@ -40,7 +40,6 @@
 #include "llvm/CodeGen/MachineRegisterInfo.h"
 #include "llvm/CodeGen/PseudoSourceValue.h"
 #include "llvm/CodeGen/SelectionDAG.h"
-#include "llvm/CodeGen/DwarfWriter.h"
 #include "llvm/Analysis/DebugInfo.h"
 #include "llvm/Target/TargetRegisterInfo.h"
 #include "llvm/Target/TargetData.h"
@@ -3798,9 +3797,6 @@
     if (OptLevel != CodeGenOpt::None)
       // FIXME: Variable debug info is not supported here.
       return 0;
-    DwarfWriter *DW = DAG.getDwarfWriter();
-    if (!DW)
-      return 0;
     DbgDeclareInst &DI = cast<DbgDeclareInst>(I);
     if (!DIDescriptor::ValidDebugInfo(DI.getVariable(), CodeGenOpt::None))
       return 0;
@@ -3822,14 +3818,11 @@
     int FI = SI->second;
 
     if (MachineModuleInfo *MMI = DAG.getMachineModuleInfo())
-      if (!DI.getDebugLoc().isUnknown())
+      if (!DI.getDebugLoc().isUnknown() && MMI->hasDebugInfo())
         MMI->setVariableDbgInfo(Variable, FI, DI.getDebugLoc());
     return 0;
   }
   case Intrinsic::dbg_value: {
-    DwarfWriter *DW = DAG.getDwarfWriter();
-    if (!DW)
-      return 0;
     DbgValueInst &DI = cast<DbgValueInst>(I);
     if (!DIDescriptor::ValidDebugInfo(DI.getVariable(), CodeGenOpt::None))
       return 0;
@@ -3875,7 +3868,7 @@
     int FI = SI->second;
     
     if (MachineModuleInfo *MMI = DAG.getMachineModuleInfo())
-      if (!DI.getDebugLoc().isUnknown())
+      if (!DI.getDebugLoc().isUnknown() && MMI->hasDebugInfo())
         MMI->setVariableDbgInfo(Variable, FI, DI.getDebugLoc());
     return 0;
   }
diff --git a/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp b/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
index 69ff94b..2ae234d 100644
--- a/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
+++ b/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
@@ -332,8 +332,7 @@
   DEBUG(dbgs() << "\n\n\n=== " << Fn.getName() << "\n");
 
   MachineModuleInfo *MMI = getAnalysisIfAvailable<MachineModuleInfo>();
-  DwarfWriter *DW = getAnalysisIfAvailable<DwarfWriter>();
-  CurDAG->init(*MF, MMI, DW);
+  CurDAG->init(*MF, MMI);
   FuncInfo->set(Fn, *MF, EnableFastISel);
   SDB->init(GFI, *AA);