LibACPI: Add a failable way to clone an Object

This will be needed in the kernel.

Userland/Libraries/LibACPI/CMakeLists.txt

@@ -2,6 +2,7 @@ set(SOURCES
     Interpreter.cpp
     NameString.cpp
     Node.cpp
+    Object.cpp
     OpcodeFilters.cpp
     OpcodeFrame.cpp
     Table.cpp

Userland/Libraries/LibACPI/Object.cpp

@@ -0,0 +1,42 @@
+/*
+ * Copyright (c) 2026, Undefine <[email protected]>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include "Object.h"
+
+namespace ACPI::AML {
+
+ErrorOr<String> String::clone() const
+{
+    return String(TRY(m_buffer.clone()));
+}
+
+ErrorOr<Buffer> Buffer::clone() const
+{
+    return Buffer(TRY(m_buffer.clone()));
+}
+
+ErrorOr<Package> Package::clone() const
+{
+    Vector<Object> package;
+    TRY(package.try_ensure_capacity(m_package.size()));
+    for (auto const& object : m_package)
+        package.unchecked_append(TRY(object.clone()));
+
+    return Package(move(package));
+}
+
+ErrorOr<Object> Object::clone() const
+{
+    return m_data.visit(
+        [](AK::Empty) -> ErrorOr<Object> { return Object(); },
+        [](u64 value) -> ErrorOr<Object> { return value; },
+        [](String const& value) -> ErrorOr<Object> { return TRY(value.clone()); },
+        [](Buffer const& value) -> ErrorOr<Object> { return TRY(value.clone()); },
+        [](Package const& value) -> ErrorOr<Object> { return TRY(value.clone()); },
+        [](NameString const& value) -> ErrorOr<Object> { return TRY(value.clone()); });
+}
+
+}

Userland/Libraries/LibACPI/Object.h

@@ -27,6 +27,8 @@ public:
 
     ByteBuffer const& buffer() const { return m_buffer; }
 
+    ErrorOr<String> clone() const;
+
 private:
     ByteBuffer m_buffer;
 };
@@ -40,6 +42,8 @@ public:
 
     ByteBuffer const& buffer() const { return m_buffer; }
 
+    ErrorOr<Buffer> clone() const;
+
 private:
     ByteBuffer m_buffer;
 };
@@ -53,6 +57,8 @@ public:
 
     Vector<Object> const& package() const { return m_package; }
 
+    ErrorOr<Package> clone() const;
+
 private:
     Vector<Object> m_package;
 };
@@ -107,6 +113,8 @@ public:
         return Error::from_string_view_or_print_error_and_return_errno("Can not cast given type!"sv, EINVAL);
     }
 
+    ErrorOr<Object> clone() const;
+
 protected:
     Variant<AK::Empty, u64, String, Buffer, Package, NameString> m_data;
 };