Implement TO_STRING and 'IMAGE for composite types

src/common.c

@@ -2366,3 +2366,17 @@ void copy_with_renaming(tree_t *roots, int nroots, tree_copy_pred_t tree_pred,
    }
    list_free(&copy_ctx.copied_subs);
 }
+
+bool all_character_literals(type_t type)
+{
+   assert(type_is_enum(type));
+
+   type_t base = type_base_recur(type);
+   const int nlits = type_enum_literals(base);
+   for (int i = 0; i < nlits; i++) {
+      if (ident_char(tree_ident(type_enum_literal(base, i)), 0) != '\'')
+         return false;
+   }
+
+   return true;
+}

src/common.h

@@ -84,6 +84,7 @@ bool is_type_attribute(attr_kind_t kind);
 type_t get_type_or_null(tree_t t);
 type_t subtype_for_string(tree_t str, type_t base);
 tree_t change_ref(tree_t name, tree_t new);
+bool all_character_literals(type_t type);
 
 void copy_with_renaming(tree_t *roots, int nroots, tree_copy_pred_t tree_pred,
                         type_copy_pred_t type_pred, void *context,