diff --git a/llvm/lib/DebugInfo/DWARF/DWARFExpression.cpp b/llvm/lib/DebugInfo/DWARF/DWARFExpression.cpp
--- a/llvm/lib/DebugInfo/DWARF/DWARFExpression.cpp
+++ b/llvm/lib/DebugInfo/DWARF/DWARFExpression.cpp
@@ -454,6 +454,9 @@
       Stack.back().Kind = PrintedExpr::Value;
       break;
     }
+    case dwarf::DW_OP_nop: {
+      break;
+    }
     default:
       if (Opcode >= dwarf::DW_OP_reg0 && Opcode <= dwarf::DW_OP_reg31) {
         // DW_OP_reg<N>: A register, with the register num implied by the
@@ -487,7 +490,10 @@
     ++I;
   }
 
-  assert(Stack.size() == 1 && "expected one value on stack");
+  if (Stack.size() != 1) {
+    OS << "<stack of size " << Stack.size() << ", expected 1>";
+    return false;
+  }
 
   if (Stack.front().Kind == PrintedExpr::Address)
     OS << "[" << Stack.front().String << "]";
diff --git a/llvm/unittests/DebugInfo/DWARF/DWARFExpressionCompactPrinterTest.cpp b/llvm/unittests/DebugInfo/DWARF/DWARFExpressionCompactPrinterTest.cpp
--- a/llvm/unittests/DebugInfo/DWARF/DWARFExpressionCompactPrinterTest.cpp
+++ b/llvm/unittests/DebugInfo/DWARF/DWARFExpressionCompactPrinterTest.cpp
@@ -124,3 +124,11 @@
       {DW_OP_entry_value, 0x02, DW_OP_breg13, 0x10, DW_OP_stack_value},
       "entry([SP+16])");
 }
+
+TEST_F(DWARFExpressionCompactPrinterTest, Test_OP_nop) {
+  TestExprPrinter({DW_OP_nop}, "<stack of size 0, expected 1>");
+}
+
+TEST_F(DWARFExpressionCompactPrinterTest, Test_OP_nop_OP_reg) {
+  TestExprPrinter({DW_OP_nop, DW_OP_reg0}, "R0");
+}