diff --git a/lldb/include/lldb/Target/LanguageRuntime.h b/lldb/include/lldb/Target/LanguageRuntime.h
--- a/lldb/include/lldb/Target/LanguageRuntime.h
+++ b/lldb/include/lldb/Target/LanguageRuntime.h
@@ -67,6 +67,12 @@
 
   virtual lldb::LanguageType GetLanguageType() const = 0;
 
+  /// Return the preferred language runtime instance, which in most cases will
+  /// be the current instance.
+  virtual LanguageRuntime *GetPreferredLanguageRuntime(ValueObject &in_value) {
+    return nullptr;
+  }
+
   virtual bool GetObjectDescription(Stream &str, ValueObject &object) = 0;
 
   virtual bool GetObjectDescription(Stream &str, Value &value,
diff --git a/lldb/source/Core/ValueObjectDynamicValue.cpp b/lldb/source/Core/ValueObjectDynamicValue.cpp
--- a/lldb/source/Core/ValueObjectDynamicValue.cpp
+++ b/lldb/source/Core/ValueObjectDynamicValue.cpp
@@ -149,7 +149,18 @@
   if (known_type != lldb::eLanguageTypeUnknown &&
       known_type != lldb::eLanguageTypeC) {
     runtime = process->GetLanguageRuntime(known_type);
-    if (runtime)
+    if (auto *preferred_runtime =
+            runtime->GetPreferredLanguageRuntime(*m_parent)) {
+      // Try the preferred runtime first.
+      found_dynamic_type = preferred_runtime->GetDynamicTypeAndAddress(
+          *m_parent, m_use_dynamic, class_type_or_name, dynamic_address,
+          value_type);
+      if (found_dynamic_type)
+        // Set the operative `runtime` for later use in this function.
+        runtime = preferred_runtime;
+    }
+    if (!found_dynamic_type)
+      // Fallback to the runtime for `known_type`.
       found_dynamic_type = runtime->GetDynamicTypeAndAddress(
           *m_parent, m_use_dynamic, class_type_or_name, dynamic_address,
           value_type);
diff --git a/lldb/source/Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCClassDescriptorV2.h b/lldb/source/Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCClassDescriptorV2.h
--- a/lldb/source/Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCClassDescriptorV2.h
+++ b/lldb/source/Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCClassDescriptorV2.h
@@ -12,6 +12,7 @@
 #include <mutex>
 
 #include "AppleObjCRuntimeV2.h"
+#include "lldb/lldb-enumerations.h"
 #include "lldb/lldb-private.h"
 
 #include "Plugins/LanguageRuntime/ObjC/ObjCLanguageRuntime.h"
@@ -34,6 +35,8 @@
     return true; // any Objective-C v2 runtime class descriptor we vend is valid
   }
 
+  lldb::LanguageType GetImplementationLanguage() const override;
+
   // a custom descriptor is used for tagged pointers
   bool GetTaggedPointerInfo(uint64_t *info_bits = nullptr,
                             uint64_t *value_bits = nullptr,
diff --git a/lldb/source/Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCClassDescriptorV2.cpp b/lldb/source/Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCClassDescriptorV2.cpp
--- a/lldb/source/Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCClassDescriptorV2.cpp
+++ b/lldb/source/Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCClassDescriptorV2.cpp
@@ -10,8 +10,10 @@
 
 #include "lldb/Expression/FunctionCaller.h"
 #include "lldb/Target/ABI.h"
+#include "lldb/Target/Language.h"
 #include "lldb/Utility/LLDBLog.h"
 #include "lldb/Utility/Log.h"
+#include "lldb/lldb-enumerations.h"
 
 using namespace lldb;
 using namespace lldb_private;
@@ -668,6 +670,19 @@
   return 0;
 }
 
+// From the ObjC runtime.
+static uint8_t IS_SWIFT_STABLE = 1U << 1;
+
+LanguageType ClassDescriptorV2::GetImplementationLanguage() const {
+  std::unique_ptr<objc_class_t> objc_class;
+  if (auto *process = m_runtime.GetProcess())
+    if (Read_objc_class(process, objc_class))
+      if (objc_class->m_flags & IS_SWIFT_STABLE)
+        return lldb::eLanguageTypeSwift;
+
+  return lldb::eLanguageTypeObjC;
+}
+
 ClassDescriptorV2::iVarsStorage::iVarsStorage() : m_ivars(), m_mutex() {}
 
 size_t ClassDescriptorV2::iVarsStorage::size() { return m_ivars.size(); }
diff --git a/lldb/source/Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCRuntimeV2.h b/lldb/source/Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCRuntimeV2.h
--- a/lldb/source/Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCRuntimeV2.h
+++ b/lldb/source/Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCRuntimeV2.h
@@ -38,6 +38,8 @@
 
   static llvm::StringRef GetPluginNameStatic() { return "apple-objc-v2"; }
 
+  LanguageRuntime *GetPreferredLanguageRuntime(ValueObject &in_value) override;
+
   static char ID;
 
   bool isA(const void *ClassID) const override {
diff --git a/lldb/source/Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCRuntimeV2.cpp b/lldb/source/Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCRuntimeV2.cpp
--- a/lldb/source/Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCRuntimeV2.cpp
+++ b/lldb/source/Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCRuntimeV2.cpp
@@ -33,6 +33,7 @@
 #include "lldb/Target/ABI.h"
 #include "lldb/Target/DynamicLoader.h"
 #include "lldb/Target/ExecutionContext.h"
+#include "lldb/Target/LanguageRuntime.h"
 #include "lldb/Target/Platform.h"
 #include "lldb/Target/Process.h"
 #include "lldb/Target/RegisterContext.h"
@@ -753,6 +754,19 @@
   RegisterObjCExceptionRecognizer(process);
 }
 
+LanguageRuntime *
+AppleObjCRuntimeV2::GetPreferredLanguageRuntime(ValueObject &in_value) {
+  if (auto process_sp = in_value.GetProcessSP()) {
+    assert(process_sp.get() == m_process);
+    if (auto descriptor_sp = GetNonKVOClassDescriptor(in_value)) {
+      LanguageType impl_lang = descriptor_sp->GetImplementationLanguage();
+      if (impl_lang != eLanguageTypeUnknown)
+        return process_sp->GetLanguageRuntime(impl_lang);
+    }
+  }
+  return nullptr;
+}
+
 bool AppleObjCRuntimeV2::GetDynamicTypeAndAddress(
     ValueObject &in_value, lldb::DynamicValueType use_dynamic,
     TypeAndOrName &class_type_or_name, Address &address,
diff --git a/lldb/source/Plugins/LanguageRuntime/ObjC/ObjCLanguageRuntime.h b/lldb/source/Plugins/LanguageRuntime/ObjC/ObjCLanguageRuntime.h
--- a/lldb/source/Plugins/LanguageRuntime/ObjC/ObjCLanguageRuntime.h
+++ b/lldb/source/Plugins/LanguageRuntime/ObjC/ObjCLanguageRuntime.h
@@ -24,6 +24,7 @@
 #include "lldb/Target/LanguageRuntime.h"
 #include "lldb/Utility/ConstString.h"
 #include "lldb/Utility/ThreadSafeDenseMap.h"
+#include "lldb/lldb-enumerations.h"
 #include "lldb/lldb-private.h"
 
 class CommandObjectObjC_ClassTable_Dump;
@@ -86,6 +87,11 @@
       return (m_is_cf == eLazyBoolYes);
     }
 
+    /// Determine whether this class is implemented in Swift.
+    virtual lldb::LanguageType GetImplementationLanguage() const {
+      return lldb::eLanguageTypeObjC;
+    }
+
     virtual bool IsValid() = 0;
 
     /// There are two routines in the ObjC runtime that tagged pointer clients