[lldb] Override GetDereferencedType for TypeSystemSwift

(cherry picked from commit feacb72)

Author: kastiglione

lldb/source/Plugins/TypeSystem/Swift/TypeSystemSwift.cpp

@@ -16,6 +16,7 @@
 #include "Plugins/LanguageRuntime/Swift/SwiftLanguageRuntime.h"
 #include "lldb/Core/PluginManager.h"
 #include "lldb/Symbol/CompileUnit.h"
+#include "llvm/Support/Error.h"
 #include <lldb/lldb-enumerations.h>
 #include <llvm/ADT/StringRef.h>
 
@@ -207,6 +208,13 @@ bool TypeSystemSwift::GetPtrAuthAddressDiversity(
   return false;
 }
 
+llvm::Expected<CompilerType> TypeSystemSwift::GetDereferencedType(
+    lldb::opaque_compiler_type_t type, ExecutionContext *exe_ctx,
+    std::string &deref_name, uint32_t &deref_byte_size,
+    int32_t &deref_byte_offset, ValueObject *valobj, uint64_t &language_flags) {
+  return llvm::createStringError("Swift types cannot be dereferenced");
+}
+
 namespace llvm {
 llvm::raw_ostream &
 operator<<(llvm::raw_ostream &os,

lldb/source/Plugins/TypeSystem/Swift/TypeSystemSwift.h

@@ -350,6 +350,12 @@ class TypeSystemSwift : public TypeSystem {
   unsigned GetPtrAuthDiscriminator(lldb::opaque_compiler_type_t type) override;
   bool GetPtrAuthAddressDiversity(lldb::opaque_compiler_type_t type) override;
 
+  llvm::Expected<CompilerType>
+  GetDereferencedType(lldb::opaque_compiler_type_t type,
+                      ExecutionContext *exe_ctx, std::string &deref_name,
+                      uint32_t &deref_byte_size, int32_t &deref_byte_offset,
+                      ValueObject *valobj, uint64_t &language_flags) override;
+
   /// \}
 protected:
   /// Used in the logs.