auto& name = op_or_val_to_name_[op_or_val];
  if (!name.empty()) return StringViewToRef(name);
  // Update the value in the map with unique name.
  llvm::StringRef ref = GetUniqueName(GetName(op_or_val), hash_value);
  name = StringRefToView(ref);
  return ref;
}

absl::string_view OpOrArgNameMapper::GetUniqueNameView(OpOrVal op_or_val) {
  auto& name = op_or_val_to_name_[op_or_val];
  if (!name.empty()) return name;

  virtual bool IsUnique(llvm::StringRef name);

  // Returns a constant view of the underlying map.
  const llvm::DenseMap<OpOrVal, absl::string_view>& GetMap() const {
    return op_or_val_to_name_;
  }

  // Returns the separator used before uniqueing suffix.
  virtual llvm::StringRef GetSuffixSeparator() { return ""; }

  virtual llvm::StringRef GetDashSeparator() { return "_"; }

 private: