Add metadata for `char16_t` and `char32_t`

We don't seem to expose any API that uses `char16_t` yet, but I added it anyway since we make the type info for it.

I didn't add anything for `wchar_t` because we are not making a type info so maybe we don't have a need for it yet, it could be added in the future.

To prevent breaking compatibility with the C# bindings, we ignore the `char32_t` metadata and still use `System.Int64`.

4 files changed, 15 insertions, 5 deletions

diff --git a/core/extension/extension_api_dump.cpp b/core/extension/extension_api_dump.cpp
index 296ebc901f..4042d6b80d 100644
--- a/core/extension/extension_api_dump.cpp
+++ b/core/extension/extension_api_dump.cpp
@@ -88,7 +88,7 @@ static String get_property_info_type_name(const PropertyInfo &p_info) {
 }
 
 static String get_type_meta_name(const GodotTypeInfo::Metadata metadata) {
-	static const char *argmeta[11] = { "none", "int8", "int16", "int32", "int64", "uint8", "uint16", "uint32", "uint64", "float", "double" };
+	static const char *argmeta[13] = { "none", "int8", "int16", "int32", "int64", "uint8", "uint16", "uint32", "uint64", "float", "double", "char16", "char32" };
 	return argmeta[metadata];
 }
 
diff --git a/core/extension/gdextension_interface.h b/core/extension/gdextension_interface.h
index d3132baf1b..988974b5d5 100644
--- a/core/extension/gdextension_interface.h
+++ b/core/extension/gdextension_interface.h
@@ -421,7 +421,9 @@ typedef enum {
 	GDEXTENSION_METHOD_ARGUMENT_METADATA_INT_IS_UINT32,
 	GDEXTENSION_METHOD_ARGUMENT_METADATA_INT_IS_UINT64,
 	GDEXTENSION_METHOD_ARGUMENT_METADATA_REAL_IS_FLOAT,
-	GDEXTENSION_METHOD_ARGUMENT_METADATA_REAL_IS_DOUBLE
+	GDEXTENSION_METHOD_ARGUMENT_METADATA_REAL_IS_DOUBLE,
+	GDEXTENSION_METHOD_ARGUMENT_METADATA_INT_IS_CHAR16,
+	GDEXTENSION_METHOD_ARGUMENT_METADATA_INT_IS_CHAR32,
 } GDExtensionClassMethodArgumentMetadata;
 
 typedef void (*GDExtensionClassMethodCall)(void *method_userdata, GDExtensionClassInstancePtr p_instance, const GDExtensionConstVariantPtr *p_args, GDExtensionInt p_argument_count, GDExtensionVariantPtr r_return, GDExtensionCallError *r_error);
diff --git a/core/variant/type_info.h b/core/variant/type_info.h
index d51c80eebe..6bb703f2dd 100644
--- a/core/variant/type_info.h
+++ b/core/variant/type_info.h
@@ -47,7 +47,9 @@ enum Metadata {
 	METADATA_INT_IS_UINT32,
 	METADATA_INT_IS_UINT64,
 	METADATA_REAL_IS_FLOAT,
-	METADATA_REAL_IS_DOUBLE
+	METADATA_REAL_IS_DOUBLE,
+	METADATA_INT_IS_CHAR16,
+	METADATA_INT_IS_CHAR32,
 };
 }
 
@@ -104,8 +106,8 @@ MAKE_TYPE_INFO_WITH_META(uint32_t, Variant::INT, GodotTypeInfo::METADATA_INT_IS_
 MAKE_TYPE_INFO_WITH_META(int32_t, Variant::INT, GodotTypeInfo::METADATA_INT_IS_INT32)
 MAKE_TYPE_INFO_WITH_META(uint64_t, Variant::INT, GodotTypeInfo::METADATA_INT_IS_UINT64)
 MAKE_TYPE_INFO_WITH_META(int64_t, Variant::INT, GodotTypeInfo::METADATA_INT_IS_INT64)
-MAKE_TYPE_INFO(char16_t, Variant::INT)
-MAKE_TYPE_INFO(char32_t, Variant::INT)
+MAKE_TYPE_INFO_WITH_META(char16_t, Variant::INT, GodotTypeInfo::METADATA_INT_IS_CHAR16)
+MAKE_TYPE_INFO_WITH_META(char32_t, Variant::INT, GodotTypeInfo::METADATA_INT_IS_CHAR32)
 MAKE_TYPE_INFO_WITH_META(float, Variant::FLOAT, GodotTypeInfo::METADATA_REAL_IS_FLOAT)
 MAKE_TYPE_INFO_WITH_META(double, Variant::FLOAT, GodotTypeInfo::METADATA_REAL_IS_DOUBLE)
 
diff --git a/modules/mono/editor/bindings_generator.cpp b/modules/mono/editor/bindings_generator.cpp
index 2ec073e4fa..3222c58c4e 100644
--- a/modules/mono/editor/bindings_generator.cpp
+++ b/modules/mono/editor/bindings_generator.cpp
@@ -3448,6 +3448,12 @@ StringName BindingsGenerator::_get_int_type_name_from_meta(GodotTypeInfo::Metada
 		case GodotTypeInfo::METADATA_INT_IS_UINT64:
 			return "ulong";
 			break;
+		case GodotTypeInfo::METADATA_INT_IS_CHAR16:
+			return "char";
+			break;
+		case GodotTypeInfo::METADATA_INT_IS_CHAR32:
+			// To prevent breaking compatibility, C# bindings need to keep using `long`.
+			return "long";
 		default:
 			// Assume INT64
 			return "long";