Add swiftcall signature check for mono_class_try_get_swift_error_class (#105408)

* Add signature check for swiftcall

* Handle null values for swift_error_ptr

Author: kotlarmilos

src/mono/mono/metadata/marshal.c

@@ -3702,7 +3702,7 @@ mono_marshal_get_native_wrapper (MonoMethod *method, gboolean check_exceptions,
 			MonoClass *swift_self_t = mono_class_try_get_swift_self_t_class ();
 			MonoClass *swift_error = mono_class_try_get_swift_error_class ();
 			MonoClass *swift_indirect_result = mono_class_try_get_swift_indirect_result_class ();
-			MonoClass *swift_error_ptr = mono_class_create_ptr (m_class_get_this_arg (swift_error));
+			MonoClass *swift_error_ptr = swift_error ? mono_class_create_ptr (m_class_get_this_arg (swift_error)) : NULL;
 			int swift_error_args = 0, swift_self_args = 0, swift_indirect_result_args = 0;
 			for (int i = 0; i < method->signature->param_count; ++i) {
 				MonoClass *param_klass = mono_class_from_mono_type_internal (method->signature->params [i]);

src/mono/mono/mini/interp/transform.c

@@ -4486,8 +4486,6 @@ interp_method_compute_offsets (TransformData *td, InterpMethod *imethod, MonoMet
 #ifdef MONO_ARCH_HAVE_SWIFTCALL
 	int swift_error_index = -1;
 	imethod->swift_error_offset = -1;
-	MonoClass *swift_error = mono_class_try_get_swift_error_class ();
-	MonoClass *swift_error_ptr = mono_class_create_ptr (m_class_get_this_arg (swift_error));
 #endif
 
 	/*
@@ -4517,6 +4515,8 @@ interp_method_compute_offsets (TransformData *td, InterpMethod *imethod, MonoMet
 
 #ifdef MONO_ARCH_HAVE_SWIFTCALL
 	if (swift_error_index < 0 && mono_method_signature_has_ext_callconv (sig, MONO_EXT_CALLCONV_SWIFTCALL)) {
+		MonoClass *swift_error = mono_class_try_get_swift_error_class ();
+		MonoClass *swift_error_ptr = swift_error ? mono_class_create_ptr (m_class_get_this_arg (swift_error)) : NULL;
 		MonoClass *klass = mono_class_from_mono_type_internal (type);
 		if (klass == swift_error_ptr)
 			swift_error_index = i;

src/mono/mono/mini/mini-amd64.c

@@ -1089,7 +1089,7 @@ get_call_info (MonoMemPool *mp, MonoMethodSignature *sig)
 			MonoClass *swift_self = mono_class_try_get_swift_self_class ();
 			MonoClass *swift_error = mono_class_try_get_swift_error_class ();
 			MonoClass *swift_indirect_result = mono_class_try_get_swift_indirect_result_class ();
-			MonoClass *swift_error_ptr = mono_class_create_ptr (m_class_get_this_arg (swift_error));
+			MonoClass *swift_error_ptr = swift_error ? mono_class_create_ptr (m_class_get_this_arg (swift_error)) : NULL;
 			MonoClass *klass = mono_class_from_mono_type_internal (sig->params [i]);
 			if (klass == swift_indirect_result)
 				cinfo->need_swift_return_buffer = TRUE;
@@ -1553,7 +1553,7 @@ gpointer
 mono_arch_get_swift_error (CallContext *ccontext, MonoMethodSignature *sig, int *arg_index)
 {
 	MonoClass *swift_error = mono_class_try_get_swift_error_class ();
-	MonoClass *swift_error_ptr = mono_class_create_ptr (m_class_get_this_arg (swift_error));
+	MonoClass *swift_error_ptr = swift_error ? mono_class_create_ptr (m_class_get_this_arg (swift_error)) : NULL;
 	for (guint i = 0; i < sig->param_count + sig->hasthis; i++) {
 		MonoClass *klass = mono_class_from_mono_type_internal (sig->params [i]);
 		if (klass && (klass == swift_error || klass == swift_error_ptr)) {

src/mono/mono/mini/mini-arm64.c

@@ -1916,7 +1916,7 @@ get_call_info (MonoMemPool *mp, MonoMethodSignature *sig)
 			MonoClass *swift_self = mono_class_try_get_swift_self_class ();
 			MonoClass *swift_error = mono_class_try_get_swift_error_class ();
 			MonoClass *swift_indirect_result = mono_class_try_get_swift_indirect_result_class ();
-			MonoClass *swift_error_ptr = mono_class_create_ptr (m_class_get_this_arg (swift_error));
+			MonoClass *swift_error_ptr = swift_error ? mono_class_create_ptr (m_class_get_this_arg (swift_error)) : NULL;
 			MonoClass *klass = mono_class_from_mono_type_internal (sig->params [pindex]);
 			if ((klass == swift_self || klass == swift_indirect_result) && sig->pinvoke) {
 				guint32 align;
@@ -2269,7 +2269,7 @@ gpointer
 mono_arch_get_swift_error (CallContext *ccontext, MonoMethodSignature *sig, int *arg_index)
 {
 	MonoClass *swift_error = mono_class_try_get_swift_error_class ();
-	MonoClass *swift_error_ptr = mono_class_create_ptr (m_class_get_this_arg (swift_error));
+	MonoClass *swift_error_ptr = swift_error ? mono_class_create_ptr (m_class_get_this_arg (swift_error)) : NULL;
 	for (guint i = 0; i < sig->param_count + sig->hasthis; i++) {
 		MonoClass *klass = mono_class_from_mono_type_internal (sig->params [i]);
 		if (klass && (klass == swift_error || klass == swift_error_ptr)) {