feat: implement module loading

I couldn't care less to commit all the changes separately after fight
with this stupid codebase.
Also I am closing the issue since serializing contexts meant doing
something like jars which I don't want to do right now. I'll reopen the
issue though for sure clueless.

Closes: #23

furvm/include/furvm/detail/serialization.hpp

@@ -16,6 +16,14 @@ namespace detail {
  * @return The output stream.
  */
 std::ostream& serialize(std::ostream& os, std::int8_t value);
+
+/**
+ * @brief Serializes an integer.
+ *
+ * @param os Output stream.
+ * @param value Integer.
+ * @return The output stream.
+ */
 std::ostream& serialize(std::ostream& os, std::int16_t value);
 
 /**
@@ -26,6 +34,14 @@ std::ostream& serialize(std::ostream& os, std::int16_t value);
  * @return The output stream.
  */
 std::ostream& serialize(std::ostream& os, std::int32_t value);
+
+/**
+ * @brief Serializes an integer.
+ *
+ * @param os Output stream.
+ * @param value Integer.
+ * @return The output stream.
+ */
 std::ostream& serialize(std::ostream& os, std::int64_t value);
 
 /**
@@ -73,6 +89,87 @@ std::ostream& serialize(std::ostream& os, std::uint64_t value);
  */
 std::ostream& serialize(std::ostream& os, const std::string& value);
 
+/**
+ * @brief Deserializes an integer.
+ *
+ * @param is Input stream.
+ * @param value Integer.
+ * @return The input stream.
+ */
+std::istream& load(std::istream& is, std::int8_t& value);
+
+/**
+ * @brief Deserializes an integer.
+ *
+ * @param is Input stream.
+ * @param value Integer.
+ * @return The input stream.
+ */
+std::istream& load(std::istream& is, std::int16_t& value);
+
+/**
+ * @brief Deserializes an integer.
+ *
+ * @param is Input stream.
+ * @param value Integer.
+ * @return The input stream.
+ */
+std::istream& load(std::istream& is, std::int32_t& value);
+
+/**
+ * @brief Deserializes an integer.
+ *
+ * @param is Input stream.
+ * @param value Integer.
+ * @return The input stream.
+ */
+std::istream& load(std::istream& is, std::int64_t& value);
+
+/**
+ * @brief Deserializes an integer.
+ *
+ * @param is Input stream.
+ * @param value Integer.
+ * @return The input stream.
+ */
+std::istream& load(std::istream& is, std::uint8_t& value);
+
+/**
+ * @brief Deserializes an integer.
+ *
+ * @param is Input stream.
+ * @param value Integer.
+ * @return The input stream.
+ */
+std::istream& load(std::istream& is, std::uint16_t& value);
+
+/**
+ * @brief Deserializes an integer.
+ *
+ * @param is Input stream.
+ * @param value Integer.
+ * @return The input stream.
+ */
+std::istream& load(std::istream& is, std::uint32_t& value);
+
+/**
+ * @brief Deserializes an integer.
+ *
+ * @param is Input stream.
+ * @param value Integer.
+ * @return The input stream.
+ */
+std::istream& load(std::istream& is, std::uint64_t& value);
+
+/**
+ * @brief Deserializes a string.
+ *
+ * @param is Input stream.
+ * @param value String.
+ * @return The input stream.
+ */
+std::istream& load(std::istream& is, std::string& value);
+
 } // namespace detail
 } // namespace furvm
 

furvm/include/furvm/function.hpp

@@ -63,8 +63,18 @@ public:
     /**
      * @brief Constructs an import function.
      *
-     * @param paramCount Parameter count.
-     * @param imp Import function.
+     * @param mod Module's id.
+     * @param function Function's id.
+     */
+    template <typename ModFwd, typename = std::enable_if_t<std::is_constructible_v<mod_id, ModFwd>>>
+    function(ModFwd&& mod, function_id function)
+      : m_type(function_t::Import), m_paramCount(0), m_value(import_function{ std::forward<ModFwd>(mod), function }) {}
+
+    /**
+     * @brief Constructs an import function.
+     *
+     * @param mod Module.
+     * @param function Function.
      */
     function(const mod_h& mod, const function_h& function);
 

furvm/include/furvm/handle.hpp

@@ -98,6 +98,8 @@ public:
     using const_pointer   = const Value*; /** Constant pointer type. */
 public:
     using id_type = typename Header::id_type; /** Id type of the header. */
+
+    using header_type = Header;
 public:
     using pair_type = std::pair<Header, Value>; /** Type of a header-value pair. */
 public:
@@ -362,9 +364,16 @@ public:
             delete m_pairs[id];
         }
 
-        pair_type* newPair = new pair_type(std::piecewise_construct,
-            std::forward_as_tuple(id, 0, [&](const id_type& id) { erase(id); }),
-            std::forward_as_tuple(std::forward<Args>(args)...));
+        pair_type* newPair = nullptr;
+        if constexpr (detail::header_has_refcount_v<typename Handle::header_type>) {
+            newPair = new pair_type(std::piecewise_construct,
+                std::forward_as_tuple(id, 0, [&](const id_type& id) { erase(id); }),
+                std::forward_as_tuple(std::forward<Args>(args)...));
+        } else {
+            newPair = new pair_type(std::piecewise_construct,
+                std::forward_as_tuple(id),
+                std::forward_as_tuple(std::forward<Args>(args)...));
+        }
 
         m_pairs[id] = newPair;
         return { newPair };

furvm/include/furvm/module.hpp

@@ -7,8 +7,10 @@
 #include "furvm/type.hpp" // IWYU pragma: keep
 
 #include <functional>
+#include <istream>
 #include <ostream>
 #include <string>
+#include <type_traits>
 #include <unordered_map>
 #include <utility>
 #include <vector>
@@ -82,7 +84,13 @@ public:
      */
     template <typename... Args>
     function_h emplace_function(Args&&... args) {
-        function_h function                 = m_functions.emplace_back(std::forward<Args>(args)...);
+        function_h function;
+        if constexpr (std::is_constructible_v<class function, Args...>) {
+            function = m_functions.emplace_back(std::forward<Args>(args)...);
+        } else {
+            function = m_functions.emplace(std::forward<Args>(args)...);
+        }
+
         m_functionMap[function->name()]     = function.id();
         m_publicFunctions[function->name()] = function.id();
         return std::move(function);
@@ -145,7 +153,7 @@ public:
      * @param name Name of the function.
      * @return A handle to the function.
      */
-    template <typename NameFwd>
+    template <typename NameFwd, typename = std::enable_if_t<std::is_constructible_v<std::string, NameFwd>>>
     auto function_at(NameFwd&& name) {
         return function_at(m_publicFunctions.at(std::forward<NameFwd>(name)));
     }
@@ -156,7 +164,7 @@ public:
      * @param name Name of the function.
      * @return A handle to the function.
      */
-    template <typename NameFwd>
+    template <typename NameFwd, typename = std::enable_if_t<std::is_constructible_v<std::string, NameFwd>>>
     auto function_at(NameFwd&& name) const {
         return function_at(m_publicFunctions.at(std::forward<NameFwd>(name)));
     }
@@ -197,7 +205,11 @@ public:
      */
     template <typename... Args>
     auto emplace_type(Args&&... args) {
-        return m_types.emplace_back(std::forward<Args>(args)...);
+        if constexpr (std::is_constructible_v<type_p, Args...>) {
+            return m_types.emplace_back(std::forward<Args>(args)...);
+        } else {
+            return m_types.emplace(std::forward<Args>(args)...);
+        }
     }
 
     /**
@@ -239,6 +251,14 @@ public:
      * @return The output stream.
      */
     std::ostream& serialize(std::ostream& os) const;
+
+    /**
+     * @brief Loads a module in a bytecode form from an input stream.
+     *
+     * @param is Input stream.
+     * @return The loaded module.
+     */
+    static mod load(std::istream& is);
 private:
     bytecode_t m_bytecode;
 

furvm/include/furvm/type.hpp

@@ -5,7 +5,6 @@
 #include "furvm/handle.hpp" // IWYU pragma: keep
 
 #include <cstdint>
-
 namespace furvm {
 
 enum class type_t : std::uint32_t {