[runtime] Fix Type.GetTypeCode () for generic enums. (#34670)

Fixes https://github.com/mono/mono/issues/17735.

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Co-authored-by: vargaz <vargaz@users.noreply.github.com>

diff --git a/src/mono/mono/metadata/icall.c b/src/mono/mono/metadata/icall.c
index 35ab2bb..b07fe63 100644 (file)
--- a/src/mono/mono/metadata/icall.c
+++ b/src/mono/mono/metadata/icall.c
@@ -2000,13 +2000,12 @@ guint32
 ves_icall_type_GetTypeCodeInternal (MonoReflectionTypeHandle ref_type, MonoError *error)
 {
        MonoType *type = MONO_HANDLE_GETVAL (ref_type, type);
-       int t = type->type;
 
        if (type->byref)
                return TYPECODE_OBJECT;
 
 handle_enum:
-       switch (t) {
+       switch (type->type) {
        case MONO_TYPE_VOID:
                return TYPECODE_OBJECT;
        case MONO_TYPE_BOOLEAN:
@@ -2041,7 +2040,7 @@ handle_enum:
                MonoClass *klass = type->data.klass;
                
                if (m_class_is_enumtype (klass)) {
-                       t = mono_class_enum_basetype_internal (klass)->type;
+                       type = mono_class_enum_basetype_internal (klass);
                        goto handle_enum;
                } else if (mono_is_corlib_image (m_class_get_image (klass))) {
                        if (strcmp (m_class_get_name_space (klass), "System") == 0) {
@@ -2072,9 +2071,13 @@ handle_enum:
                }
                return TYPECODE_OBJECT;
        case MONO_TYPE_GENERICINST:
+               if (m_class_is_enumtype (type->data.generic_class->container_class)) {
+                       type = mono_class_enum_basetype_internal (type->data.generic_class->container_class);
+                       goto handle_enum;
+               }
                return TYPECODE_OBJECT;
        default:
-               g_error ("type 0x%02x not handled in GetTypeCode()", t);
+               g_error ("type 0x%02x not handled in GetTypeCode()", type->type);
        }
        return 0;
 }