From bd820bcdcb4b9f2d8450b12246ce2bdb414975ce Mon Sep 17 00:00:00 2001
From: Dave Lee <davelee.com@gmail.com>
Date: Wed, 9 Jul 2025 10:26:42 -0700
Subject: [PATCH] [lldb] Override GetDereferencedType for TypeSystemSwift

(cherry picked from commit feacb720737020830ca7b1b6c0b7294e12e9e5b5)
---
 lldb/source/Plugins/TypeSystem/Swift/TypeSystemSwift.cpp | 8 ++++++++
 lldb/source/Plugins/TypeSystem/Swift/TypeSystemSwift.h   | 6 ++++++
 2 files changed, 14 insertions(+)

diff --git a/lldb/source/Plugins/TypeSystem/Swift/TypeSystemSwift.cpp b/lldb/source/Plugins/TypeSystem/Swift/TypeSystemSwift.cpp
index 8ace6bc09d4d6..916b75bd8ca44 100644
--- a/lldb/source/Plugins/TypeSystem/Swift/TypeSystemSwift.cpp
+++ b/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,
diff --git a/lldb/source/Plugins/TypeSystem/Swift/TypeSystemSwift.h b/lldb/source/Plugins/TypeSystem/Swift/TypeSystemSwift.h
index d389fba4e8c86..75d04a6d3db6d 100644
--- a/lldb/source/Plugins/TypeSystem/Swift/TypeSystemSwift.h
+++ b/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.