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diff --git a/contrib/llvm/lib/CodeGen/AsmPrinter/DebugHandlerBase.h b/contrib/llvm/lib/CodeGen/AsmPrinter/DebugHandlerBase.h
new file mode 100644
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+++ b/contrib/llvm/lib/CodeGen/AsmPrinter/DebugHandlerBase.h
@@ -0,0 +1,109 @@
+//===-- llvm/lib/CodeGen/AsmPrinter/DebugHandlerBase.h --------*- C++ -*--===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// Common functionality for different debug information format backends.
+// LLVM currently supports DWARF and CodeView.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIB_CODEGEN_ASMPRINTER_DEBUGHANDLERBASE_H
+#define LLVM_LIB_CODEGEN_ASMPRINTER_DEBUGHANDLERBASE_H
+
+#include "AsmPrinterHandler.h"
+#include "DbgValueHistoryCalculator.h"
+#include "llvm/CodeGen/LexicalScopes.h"
+#include "llvm/CodeGen/MachineInstr.h"
+
+namespace llvm {
+
+class AsmPrinter;
+class MachineModuleInfo;
+
+/// Base class for debug information backends. Common functionality related to
+/// tracking which variables and scopes are alive at a given PC live here.
+class DebugHandlerBase : public AsmPrinterHandler {
+protected:
+  DebugHandlerBase(AsmPrinter *A);
+
+  /// Target of debug info emission.
+  AsmPrinter *Asm;
+
+  /// Collected machine module information.
+  MachineModuleInfo *MMI;
+
+  /// Previous instruction's location information. This is used to
+  /// determine label location to indicate scope boundries in dwarf
+  /// debug info.
+  DebugLoc PrevInstLoc;
+  MCSymbol *PrevLabel = nullptr;
+
+  /// This location indicates end of function prologue and beginning of
+  /// function body.
+  DebugLoc PrologEndLoc;
+
+  /// If nonnull, stores the current machine instruction we're processing.
+  const MachineInstr *CurMI = nullptr;
+
+  LexicalScopes LScopes;
+
+  /// History of DBG_VALUE and clobber instructions for each user
+  /// variable.  Variables are listed in order of appearance.
+  DbgValueHistoryMap DbgValues;
+
+  /// Maps instruction with label emitted before instruction.
+  /// FIXME: Make this private from DwarfDebug, we have the necessary accessors
+  /// for it.
+  DenseMap<const MachineInstr *, MCSymbol *> LabelsBeforeInsn;
+
+  /// Maps instruction with label emitted after instruction.
+  DenseMap<const MachineInstr *, MCSymbol *> LabelsAfterInsn;
+
+  /// Indentify instructions that are marking the beginning of or
+  /// ending of a scope.
+  void identifyScopeMarkers();
+
+  /// Ensure that a label will be emitted before MI.
+  void requestLabelBeforeInsn(const MachineInstr *MI) {
+    LabelsBeforeInsn.insert(std::make_pair(MI, nullptr));
+  }
+
+  /// Ensure that a label will be emitted after MI.
+  void requestLabelAfterInsn(const MachineInstr *MI) {
+    LabelsAfterInsn.insert(std::make_pair(MI, nullptr));
+  }
+
+  // AsmPrinterHandler overrides.
+public:
+  void beginInstruction(const MachineInstr *MI) override;
+  void endInstruction() override;
+
+  void beginFunction(const MachineFunction *MF) override;
+  void endFunction(const MachineFunction *MF) override;
+
+  /// Return Label preceding the instruction.
+  MCSymbol *getLabelBeforeInsn(const MachineInstr *MI);
+
+  /// Return Label immediately following the instruction.
+  MCSymbol *getLabelAfterInsn(const MachineInstr *MI);
+
+  /// Determine the relative position of the pieces described by P1 and P2.
+  /// Returns  -1 if P1 is entirely before P2, 0 if P1 and P2 overlap,
+  /// 1 if P1 is entirely after P2.
+  static int pieceCmp(const DIExpression *P1, const DIExpression *P2);
+
+  /// Determine whether two variable pieces overlap.
+  static bool piecesOverlap(const DIExpression *P1, const DIExpression *P2);
+
+  /// If this type is derived from a base type then return base type size.
+  static uint64_t getBaseTypeSize(const DITypeRef TyRef);
+};
+
+}
+
+#endif