diff --git a/llvm/include/llvm/DebugInfo/DWARF/DWARFDebugLine.h b/llvm/include/llvm/DebugInfo/DWARF/DWARFDebugLine.h
--- a/llvm/include/llvm/DebugInfo/DWARF/DWARFDebugLine.h
+++ b/llvm/include/llvm/DebugInfo/DWARF/DWARFDebugLine.h
@@ -367,6 +367,28 @@
     void resetRowAndSequence();
     void appendRowToMatrix();
 
+    /// Advance the address by the \p OperationAdvance value. \returns the
+    /// amount advanced by.
+    uint64_t advanceAddr(uint64_t OperationAdvance);
+
+    struct AddrAndAdjustedOpcode {
+      uint64_t AddrDelta;
+      uint8_t AdjustedOpcode;
+    };
+
+    /// Advance the address as required by the specified \p Opcode.
+    /// \returns the amount advanced by and the calculated adjusted opcode.
+    AddrAndAdjustedOpcode advanceAddrForOpcode(uint8_t Opcode);
+
+    struct AddrAndLineDelta {
+      uint64_t Address;
+      int32_t Line;
+    };
+
+    /// Advance the line and address as required by the specified special \p
+    /// Opcode. \returns the address and line delta.
+    AddrAndLineDelta handleSpecialOpcode(uint8_t Opcode);
+
     /// Line table we're currently parsing.
     struct LineTable *LineTable;
     struct Row Row;
diff --git a/llvm/lib/DebugInfo/DWARF/DWARFDebugLine.cpp b/llvm/lib/DebugInfo/DWARF/DWARFDebugLine.cpp
--- a/llvm/lib/DebugInfo/DWARF/DWARFDebugLine.cpp
+++ b/llvm/lib/DebugInfo/DWARF/DWARFDebugLine.cpp
@@ -566,6 +566,67 @@
   return LT;
 }
 
+uint64_t DWARFDebugLine::ParsingState::advanceAddr(uint64_t OperationAdvance) {
+  uint64_t AddrOffset = OperationAdvance * LineTable->Prologue.MinInstLength;
+  Row.Address.Address += AddrOffset;
+  return AddrOffset;
+}
+
+DWARFDebugLine::ParsingState::AddrAndAdjustedOpcode
+DWARFDebugLine::ParsingState::advanceAddrForOpcode(uint8_t Opcode) {
+  assert(Opcode == DW_LNS_const_add_pc ||
+         Opcode >= LineTable->Prologue.OpcodeBase);
+  uint8_t OpcodeValue = Opcode;
+  if (Opcode == DW_LNS_const_add_pc)
+    OpcodeValue = 255;
+  uint8_t AdjustedOpcode = OpcodeValue - LineTable->Prologue.OpcodeBase;
+  uint64_t OperationAdvance = AdjustedOpcode / LineTable->Prologue.LineRange;
+  uint64_t AddrOffset = advanceAddr(OperationAdvance);
+  return {AddrOffset, AdjustedOpcode};
+}
+
+DWARFDebugLine::ParsingState::AddrAndLineDelta
+DWARFDebugLine::ParsingState::handleSpecialOpcode(uint8_t Opcode) {
+  // A special opcode value is chosen based on the amount that needs
+  // to be added to the line and address registers. The maximum line
+  // increment for a special opcode is the value of the line_base
+  // field in the header, plus the value of the line_range field,
+  // minus 1 (line base + line range - 1). If the desired line
+  // increment is greater than the maximum line increment, a standard
+  // opcode must be used instead of a special opcode. The "address
+  // advance" is calculated by dividing the desired address increment
+  // by the minimum_instruction_length field from the header. The
+  // special opcode is then calculated using the following formula:
+  //
+  //  opcode = (desired line increment - line_base) +
+  //           (line_range * address advance) + opcode_base
+  //
+  // If the resulting opcode is greater than 255, a standard opcode
+  // must be used instead.
+  //
+  // To decode a special opcode, subtract the opcode_base from the
+  // opcode itself to give the adjusted opcode. The amount to
+  // increment the address register is the result of the adjusted
+  // opcode divided by the line_range multiplied by the
+  // minimum_instruction_length field from the header. That is:
+  //
+  //  address increment = (adjusted opcode / line_range) *
+  //                      minimum_instruction_length
+  //
+  // The amount to increment the line register is the line_base plus
+  // the result of the adjusted opcode modulo the line_range. That is:
+  //
+  // line increment = line_base + (adjusted opcode % line_range)
+
+  DWARFDebugLine::ParsingState::AddrAndAdjustedOpcode AddrAdvanceResult =
+      advanceAddrForOpcode(Opcode);
+  int32_t LineOffset =
+      LineTable->Prologue.LineBase +
+      (AddrAdvanceResult.AdjustedOpcode % LineTable->Prologue.LineRange);
+  Row.Line += LineOffset;
+  return {AddrAdvanceResult.AddrDelta, LineOffset};
+}
+
 Error DWARFDebugLine::LineTable::parse(
     DWARFDataExtractor &DebugLineData, uint64_t *OffsetPtr,
     const DWARFContext &Ctx, const DWARFUnit *U,
@@ -793,8 +854,7 @@
         // result to the address register of the state machine.
         {
           uint64_t AddrOffset =
-              DebugLineData.getULEB128(OffsetPtr) * Prologue.MinInstLength;
-          State.Row.Address.Address += AddrOffset;
+              State.advanceAddr(DebugLineData.getULEB128(OffsetPtr));
           if (OS)
             *OS << " (" << AddrOffset << ")";
         }
@@ -849,13 +909,9 @@
         // than twice that range will it need to use both DW_LNS_advance_pc
         // and a special opcode, requiring three or more bytes.
         {
-          uint8_t AdjustOpcode = 255 - Prologue.OpcodeBase;
-          uint64_t AddrOffset =
-              (AdjustOpcode / Prologue.LineRange) * Prologue.MinInstLength;
-          State.Row.Address.Address += AddrOffset;
+          uint64_t AddrOffset = State.advanceAddrForOpcode(Opcode).AddrDelta;
           if (OS)
-            *OS
-                << format(" (0x%16.16" PRIx64 ")", AddrOffset);
+            *OS << format(" (0x%16.16" PRIx64 ")", AddrOffset);
         }
         break;
 
@@ -915,49 +971,11 @@
         break;
       }
     } else {
-      // Special Opcodes
-
-      // A special opcode value is chosen based on the amount that needs
-      // to be added to the line and address registers. The maximum line
-      // increment for a special opcode is the value of the line_base
-      // field in the header, plus the value of the line_range field,
-      // minus 1 (line base + line range - 1). If the desired line
-      // increment is greater than the maximum line increment, a standard
-      // opcode must be used instead of a special opcode. The "address
-      // advance" is calculated by dividing the desired address increment
-      // by the minimum_instruction_length field from the header. The
-      // special opcode is then calculated using the following formula:
-      //
-      //  opcode = (desired line increment - line_base) +
-      //           (line_range * address advance) + opcode_base
-      //
-      // If the resulting opcode is greater than 255, a standard opcode
-      // must be used instead.
-      //
-      // To decode a special opcode, subtract the opcode_base from the
-      // opcode itself to give the adjusted opcode. The amount to
-      // increment the address register is the result of the adjusted
-      // opcode divided by the line_range multiplied by the
-      // minimum_instruction_length field from the header. That is:
-      //
-      //  address increment = (adjusted opcode / line_range) *
-      //                      minimum_instruction_length
-      //
-      // The amount to increment the line register is the line_base plus
-      // the result of the adjusted opcode modulo the line_range. That is:
-      //
-      // line increment = line_base + (adjusted opcode % line_range)
-
-      uint8_t AdjustOpcode = Opcode - Prologue.OpcodeBase;
-      uint64_t AddrOffset =
-          (AdjustOpcode / Prologue.LineRange) * Prologue.MinInstLength;
-      int32_t LineOffset =
-          Prologue.LineBase + (AdjustOpcode % Prologue.LineRange);
-      State.Row.Line += LineOffset;
-      State.Row.Address.Address += AddrOffset;
+      // Special Opcodes.
+      ParsingState::AddrAndLineDelta Delta = State.handleSpecialOpcode(Opcode);
 
       if (OS) {
-        *OS << "address += " << AddrOffset << ",  line += " << LineOffset
+        *OS << "address += " << Delta.Address << ",  line += " << Delta.Line
             << "\n";
         OS->indent(12);
         State.Row.dump(*OS);