refactor: serialize types in module

Refs: #23

furvm/src/module.cpp

@@ -2,8 +2,10 @@
 
 #include "furvm/detail/serialization.hpp"
 #include "furvm/fwd.hpp"
+#include "furvm/type.hpp"
 
 #include <ios>
+#include <stdexcept>
 
 namespace furvm {
 
@@ -35,6 +37,26 @@ std::ostream& mod::serialize(std::ostream& os) const {
         }
     }
 
+    type_id typeCount = type_id(m_types.cend() - m_types.cbegin());
+    detail::serialize(os, typeCount);
+    for (type_id id = 0; id < typeCount; ++id) {
+        if (!m_types.contains(id)) {
+            detail::serialize(os, std::uint8_t(0xFF)); // null type
+            continue;
+        }
+
+        auto type = *m_types.at(id);
+        switch (type->t) {
+        case type_t::Primitive: detail::serialize(os, type->primitive); break;
+        case type_t::Reference: throw std::runtime_error("reference type serialization is unimplemented");
+        case type_t::List: detail::serialize(os, type->list.id()); break;
+        case type_t::Import: {
+            detail::serialize(os, type->imp.mod);
+            detail::serialize(os, type->imp.type);
+        } break;
+        }
+    }
+
     detail::serialize(os, std::uint64_t(m_bytecode.size()));
     return os.write(reinterpret_cast<const char*>(m_bytecode.data()), static_cast<std::streamsize>(m_bytecode.size()));
 }