diff --git a/mlir/include/mlir/Pass/Pass.h b/mlir/include/mlir/Pass/Pass.h
--- a/mlir/include/mlir/Pass/Pass.h
+++ b/mlir/include/mlir/Pass/Pass.h
@@ -55,7 +55,15 @@
   const PassInfo *lookupPassInfo() const { return lookupPassInfo(getPassID()); }
 
   /// Returns the derived pass name.
-  virtual StringRef getName() = 0;
+  virtual StringRef getName() const = 0;
+
+  /// Returns the command line argument used when registering this pass. Return
+  /// an empty string if one does not exist.
+  virtual StringRef getArgument() const {
+    if (const PassInfo *passInfo = lookupPassInfo())
+      return passInfo->getPassArgument();
+    return "";
+  }
 
   /// Returns the name of the operation that this pass operates on, or None if
   /// this is a generic OperationPass.
@@ -332,12 +340,7 @@
   PassWrapper() : BaseT(PassID::getID<PassT>()) {}
 
   /// Returns the derived pass name.
-  StringRef getName() override {
-    StringRef name = llvm::getTypeName<PassT>();
-    if (!name.consume_front("mlir::"))
-      name.consume_front("(anonymous namespace)::");
-    return name;
-  }
+  StringRef getName() const override { return llvm::getTypeName<PassT>(); }
 
   /// A clone method to create a copy of this pass.
   std::unique_ptr<Pass> clonePass() const override {
diff --git a/mlir/lib/Pass/Pass.cpp b/mlir/lib/Pass/Pass.cpp
--- a/mlir/lib/Pass/Pass.cpp
+++ b/mlir/lib/Pass/Pass.cpp
@@ -59,11 +59,14 @@
     });
     return;
   }
-  // Otherwise, print the pass argument followed by its options.
-  if (const PassInfo *info = lookupPassInfo())
-    os << info->getPassArgument();
+  // Otherwise, print the pass argument followed by its options. If the pass
+  // doesn't have an argument, print the name of the pass to give some indicator
+  // of what pass was run.
+  StringRef argument = getArgument();
+  if (!argument.empty())
+    os << argument;
   else
-    os << getName();
+    os << "unknown<" << getName() << ">";
   passOptions.print(os);
 }
 
diff --git a/mlir/tools/mlir-tblgen/PassGen.cpp b/mlir/tools/mlir-tblgen/PassGen.cpp
--- a/mlir/tools/mlir-tblgen/PassGen.cpp
+++ b/mlir/tools/mlir-tblgen/PassGen.cpp
@@ -42,10 +42,10 @@
   {0}Base(const {0}Base &) : {1}(PassID::getID<DerivedT>()) {{}
 
   /// Returns the command-line argument attached to this pass.
-  static llvm::StringRef getPassArgument() { return "{2}"; }
+  llvm::StringRef getArgument() const override { return "{2}"; }
 
   /// Returns the derived pass name.
-  llvm::StringRef getName() override { return "{0}"; }
+  llvm::StringRef getName() const override { return "{0}"; }
 
   /// Support isa/dyn_cast functionality for the derived pass class.
   static bool classof(const ::mlir::Pass *pass) {{