diff --git a/lldb/source/Plugins/StructuredData/DarwinLog/StructuredDataDarwinLog.cpp b/lldb/source/Plugins/StructuredData/DarwinLog/StructuredDataDarwinLog.cpp
index 61e04900da342d..f8a8df84ca37f2 100644
--- a/lldb/source/Plugins/StructuredData/DarwinLog/StructuredDataDarwinLog.cpp
+++ b/lldb/source/Plugins/StructuredData/DarwinLog/StructuredDataDarwinLog.cpp
@@ -32,6 +32,8 @@
 #include "lldb/Utility/Log.h"
 #include "lldb/Utility/RegularExpression.h"
 
+#include "llvm/ADT/StringMap.h"
+
 #define DARWIN_LOG_TYPE_VALUE "DarwinLog"
 
 using namespace lldb;
@@ -183,21 +185,20 @@ class FilterRule {
       std::function<FilterRuleSP(bool accept, size_t attribute_index,
                                  const std::string &op_arg, Status &error)>;
 
-  static void RegisterOperation(ConstString operation,
+  static void RegisterOperation(llvm::StringRef operation,
                                 const OperationCreationFunc &creation_func) {
     GetCreationFuncMap().insert(std::make_pair(operation, creation_func));
   }
 
   static FilterRuleSP CreateRule(bool match_accepts, size_t attribute,
-                                 ConstString operation,
+                                 llvm::StringRef operation,
                                  const std::string &op_arg, Status &error) {
     // Find the creation func for this type of filter rule.
     auto map = GetCreationFuncMap();
     auto find_it = map.find(operation);
     if (find_it == map.end()) {
-      error.SetErrorStringWithFormat("unknown filter operation \""
-                                     "%s\"",
-                                     operation.GetCString());
+      error.SetErrorStringWithFormatv("unknown filter operation \"{0}\"",
+                                      operation);
       return FilterRuleSP();
     }
 
@@ -217,7 +218,7 @@ class FilterRule {
     dict_p->AddStringItem("attribute", s_filter_attributes[m_attribute_index]);
 
     // Indicate the type of the rule.
-    dict_p->AddStringItem("type", GetOperationType().GetCString());
+    dict_p->AddStringItem("type", GetOperationType());
 
     // Let the rule add its own specific details here.
     DoSerialization(*dict_p);
@@ -227,10 +228,10 @@ class FilterRule {
 
   virtual void Dump(Stream &stream) const = 0;
 
-  ConstString GetOperationType() const { return m_operation; }
+  llvm::StringRef GetOperationType() const { return m_operation; }
 
 protected:
-  FilterRule(bool accept, size_t attribute_index, ConstString operation)
+  FilterRule(bool accept, size_t attribute_index, llvm::StringRef operation)
       : m_accept(accept), m_attribute_index(attribute_index),
         m_operation(operation) {}
 
@@ -243,7 +244,7 @@ class FilterRule {
   }
 
 private:
-  using CreationFuncMap = std::map<ConstString, OperationCreationFunc>;
+  using CreationFuncMap = llvm::StringMap<OperationCreationFunc>;
 
   static CreationFuncMap &GetCreationFuncMap() {
     static CreationFuncMap s_map;
@@ -252,7 +253,8 @@ class FilterRule {
 
   const bool m_accept;
   const size_t m_attribute_index;
-  const ConstString m_operation;
+  // The lifetime of m_operation should be static.
+  const llvm::StringRef m_operation;
 };
 
 using FilterRules = std::vector<FilterRuleSP>;
@@ -296,8 +298,8 @@ class RegexFilterRule : public FilterRule {
     return FilterRuleSP(new RegexFilterRule(accept, attribute_index, op_arg));
   }
 
-  static ConstString StaticGetOperation() {
-    static ConstString s_operation("regex");
+  static llvm::StringRef StaticGetOperation() {
+    static constexpr llvm::StringLiteral s_operation("regex");
     return s_operation;
   }
 
@@ -341,8 +343,8 @@ class ExactMatchFilterRule : public FilterRule {
         new ExactMatchFilterRule(accept, attribute_index, op_arg));
   }
 
-  static ConstString StaticGetOperation() {
-    static ConstString s_operation("match");
+  static llvm::StringRef StaticGetOperation() {
+    static constexpr llvm::StringLiteral s_operation("match");
     return s_operation;
   }
 
@@ -701,7 +703,7 @@ class EnableOptions : public Options {
 
     // add filter spec
     auto rule_sp = FilterRule::CreateRule(
-        accept, attribute_index, ConstString(operation),
+        accept, attribute_index, operation,
         std::string(rule_text.substr(operation_end_pos + 1)), error);
 
     if (rule_sp && error.Success())