refactor(furvm): improve serialization

Refs: #12

.clang-tidy

@@ -11,6 +11,7 @@ Checks: >
   -bugprone-assignment-in-if-condition,
   -bugprone-easily-swappable-parameters,
   -bugprone-multi-level-implicit-pointer-conversion,
+  -bugprone-unintended-char-ostream-output,
   -readability-function-cognitive-complexity,
   -readability-magic-numbers,
   -readability-redundant-access-specifiers,

furvm/include/furvm/constant.hpp

@@ -1,49 +1,13 @@
 #ifndef FURVM_CONSTANT_HPP
 #define FURVM_CONSTANT_HPP
 
+#include "furvm/exceptions.hpp"
 #include "furvm/fwd.hpp"
 
-#include <exception>
 #include <string_view>
 
 namespace furvm {
 
-/**
- * @brief Bad constant access exception.
- */
-class bad_constant_access : public std::exception {
-public:
-    bad_constant_access()           = default;
-    ~bad_constant_access() override = default;
-
-    /**
-     * @brief Move constructor.
-     */
-    bad_constant_access(bad_constant_access&&) noexcept = default;
-
-    /**
-     * @brief Move constructor.
-     */
-    bad_constant_access& operator=(bad_constant_access&&) noexcept = default;
-
-    /**
-     * @brief Copy constructor.
-     */
-    bad_constant_access(const bad_constant_access&) = default;
-
-    /**
-     * @brief Copy constructor.
-     */
-    bad_constant_access& operator=(const bad_constant_access&) = default;
-public:
-    /**
-     * @brief Returns a C-style string describing the cause of the error.
-     *
-     * @return The cause of the error.
-     */
-    const char* what() const noexcept override { return "bad constant access"; }
-};
-
 enum class constant_t : std::uint8_t {
     String, /**< String constant. */
 };

furvm/include/furvm/context.hpp

@@ -92,6 +92,8 @@ public:
     auto erase_thing(Args&&... args) {
         return m_things.erase(std::forward<Args>(args)...);
     }
+
+    thing_allocator<std::byte> thing_alloc() const { return m_thingAllocator; }
 public:
     /**
      * @brief Removes unreferenced things from the thing list.

furvm/include/furvm/detail/serialization.hpp

@@ -0,0 +1,25 @@
+#ifndef FURVM_DETAIL_SERIALIZATION_HPP
+#define FURVM_DETAIL_SERIALIZATION_HPP
+
+#include <cstdint>
+#include <ostream>
+#include <string>
+
+namespace furvm {
+namespace detail {
+
+std::ostream& serialize(std::ostream& os, std::int8_t value);
+std::ostream& serialize(std::ostream& os, std::int16_t value);
+std::ostream& serialize(std::ostream& os, std::int32_t value);
+std::ostream& serialize(std::ostream& os, std::int64_t value);
+std::ostream& serialize(std::ostream& os, std::uint8_t value);
+std::ostream& serialize(std::ostream& os, std::uint16_t value);
+std::ostream& serialize(std::ostream& os, std::uint32_t value);
+std::ostream& serialize(std::ostream& os, std::uint64_t value);
+
+std::ostream& serialize(std::ostream& os, const std::string& value);
+
+} // namespace detail
+} // namespace furvm
+
+#endif // FURVM_DETAIL_SERIALIZATION_HPP

furvm/include/furvm/exceptions.hpp

@@ -5,6 +5,75 @@
 
 namespace furvm {
 
+class bad_thing_access : public std::exception {
+public:
+    bad_thing_access()           = default;
+    ~bad_thing_access() override = default;
+
+    /**
+     * @brief Move constructor.
+     */
+    bad_thing_access(bad_thing_access&&) noexcept = default;
+
+    /**
+     * @brief Move constructor.
+     */
+    bad_thing_access& operator=(bad_thing_access&&) noexcept = default;
+
+    /**
+     * @brief Copy constructor.
+     */
+    bad_thing_access(const bad_thing_access&) = default;
+
+    /**
+     * @brief Copy constructor.
+     */
+    bad_thing_access& operator=(const bad_thing_access&) = default;
+public:
+    /**
+     * @brief Returns a C-style string describing the cause of the error.
+     *
+     * @return The cause of the error.
+     */
+    const char* what() const noexcept override { return "bad thing access"; }
+};
+
+/**
+ * @brief Bad constant access exception.
+ */
+class bad_constant_access : public std::exception {
+public:
+    bad_constant_access()           = default;
+    ~bad_constant_access() override = default;
+
+    /**
+     * @brief Move constructor.
+     */
+    bad_constant_access(bad_constant_access&&) noexcept = default;
+
+    /**
+     * @brief Move constructor.
+     */
+    bad_constant_access& operator=(bad_constant_access&&) noexcept = default;
+
+    /**
+     * @brief Copy constructor.
+     */
+    bad_constant_access(const bad_constant_access&) = default;
+
+    /**
+     * @brief Copy constructor.
+     */
+    bad_constant_access& operator=(const bad_constant_access&) = default;
+public:
+    /**
+     * @brief Returns a C-style string describing the cause of the error.
+     *
+     * @return The cause of the error.
+     */
+    const char* what() const noexcept override { return "bad constant access"; }
+};
+
 class stack_underflow : public std::exception {
 public:
     stack_underflow()           = default;

furvm/include/furvm/executor.hpp

@@ -86,7 +86,7 @@ public:
      * @param mod Module.
      * @param function Function handle.
      */
-    void push_frame(const mod_h& mod, const function_h& function);
+    void push_frame(const mod_h& mod, function function);
 
     /**
      * @brief Pops the top frame.

furvm/include/furvm/function.hpp

@@ -18,31 +18,24 @@ enum class function_t : std::uint8_t {
 
 using native_function = std::function<void(executor&)>;
 
+struct import_function {
+    mod_id      mod;
+    function_id function;
+};
+
 class function {
 public:
     template <typename Name>
     function(Name&& name, bytecode_pos position)
       : m_name(std::forward<Name>(name)), m_type(function_t::Normal), m_value(position) {}
 
-    function(const char* name, bytecode_pos position)
-      : m_name(name), m_type(function_t::Normal), m_value(position) {}
-
     template <typename Name>
     function(Name&& name, const native_function& native)
       : m_name(std::forward<Name>(name)), m_type(function_t::Native), m_value(native) {}
 
-    function(const char* name, const native_function& native)
-      : m_name(name), m_type(function_t::Native), m_value(native) {}
-
-    template <typename Name, typename ModuleName>
-    function(Name&& name, ModuleName&& moduleName, function_id function)
-      : m_name(std::forward<Name>(name)),
-        m_type(function_t::Import),
-        m_value(std::forward<ModuleName>(moduleName), function) {}
-
-    template <typename ModuleName>
-    function(const char* name, ModuleName&& moduleName, function_id function)
-      : m_name(name), m_type(function_t::Import), m_value(std::forward<ModuleName>(moduleName), function) {}
+    template <typename Name>
+    function(Name&& name, const import_function& imp)
+      : m_name(std::forward<Name>(name)), m_type(function_t::Import), m_value(imp) {}
 
     ~function();
 
@@ -105,19 +98,9 @@ public:
      *
      * @return The name.
      */
-    const std::string& imported_module() const {
+    const import_function& imp() const {
         if (m_type != function_t::Import) throw std::runtime_error("function type mismatch");
-        return m_value.imp.moduleName;
-    }
-
-    /**
-     * @brief Returns a module of imported function.
-     *
-     * @return A handle to the module.
-     */
-    function_id imported_function() const {
-        if (m_type != function_t::Import) throw std::runtime_error("function type mismatch");
-        return m_value.imp.function;
+        return m_value.imp;
     }
 private:
     std::string m_name;
@@ -126,10 +109,7 @@ private:
     union value {
         std::size_t     position = 0;
         native_function native;
-        struct {
-            std::string moduleName;
-            function_id function;
-        } imp;
+        import_function imp;
 
         value() = default;
 
@@ -139,9 +119,8 @@ private:
         value(const native_function& native)
           : native(native) {}
 
-        template <typename Name>
-        value(Name&& moduleName, function_id function)
-          : imp({ std::forward<Name>(moduleName), function }) {}
+        value(const import_function& imp)
+          : imp(imp) {}
 
         ~value() {}
 

furvm/include/furvm/module.hpp

@@ -5,6 +5,7 @@
 #include "furvm/fwd.hpp"
 #include "furvm/handle.hpp"
 
+#include <ostream>
 #include <string>
 #include <unordered_map>
 #include <utility>
@@ -17,6 +18,8 @@ class mod {
     friend class serializer;
 public:
     using bytecode_t = std::vector<byte>; /**< An alias to a vector of bytes. */
+
+    static constexpr char MAGIC[4] = { 'F', 'u', 'r', 'M' }; /** Furvm module file magic. */
 public:
     /**
      * @brief Construct a new module.
@@ -91,6 +94,8 @@ public:
     }
 
     void erase_function(function_id id) { m_functions.erase(id); }
+public:
+    std::ostream& serialize(std::ostream& os) const;
 private:
     bytecode_t m_bytecode;
 

furvm/include/furvm/serializer.hpp

@@ -1,20 +0,0 @@
-#ifndef FURVM_SERIALIZER_HPP
-#define FURVM_SERIALIZER_HPP
-
-#include "furvm/fwd.hpp"
-
-#include <ostream>
-
-namespace furvm {
-
-class serializer {
-public:
-    static constexpr byte          MODULE_MAGIC[4] = { 'F', 'u', 'r', 'M' };
-    static constexpr std::uint32_t VERSION         = 0;
-public:
-    static bool serialize_module(std::ostream& os, const mod_p& mod);
-};
-
-} // namespace furvm
-
-#endif // FURVM_SERIALIZER_HPP

furvm/include/furvm/thing.hpp

@@ -2,11 +2,13 @@
 #define FURVM_THING_HPP
 
 #include "furlang/arena.hpp"
+#include "furvm/exceptions.hpp"
 #include "furvm/fwd.hpp"
 
 #include <cstddef>
 #include <cstdint>
 #include <cstring>
+#include <memory>
 #include <utility>
 #include <vector>
 
@@ -29,39 +31,6 @@ static inline std::size_t thing_type_size(thing_t type) {
     }
 }
 
-class bad_thing_access : public std::exception {
-public:
-    bad_thing_access()           = default;
-    ~bad_thing_access() override = default;
-
-    /**
-     * @brief Move constructor.
-     */
-    bad_thing_access(bad_thing_access&&) noexcept = default;
-
-    /**
-     * @brief Move constructor.
-     */
-    bad_thing_access& operator=(bad_thing_access&&) noexcept = default;
-
-    /**
-     * @brief Copy constructor.
-     */
-    bad_thing_access(const bad_thing_access&) = default;
-
-    /**
-     * @brief Copy constructor.
-     */
-    bad_thing_access& operator=(const bad_thing_access&) = default;
-public:
-    /**
-     * @brief Returns a C-style string describing the cause of the error.
-     *
-     * @return The cause of the error.
-     */
-    const char* what() const noexcept override { return "bad thing access"; }
-};
-
 template <template <typename> typename Allocator>
 class thing final {
     friend class executor;
@@ -73,7 +42,9 @@ public:
         m_data = m_allocator.allocate(thing_type_size(type));
     }
 
-    ~thing() { m_allocator.deallocate(m_data, thing_type_size(thing_t::Int32)); }
+    ~thing() {
+        if (m_data != nullptr) m_allocator.deallocate(m_data, thing_type_size(thing_t::Int32));
+    }
 
     /**
      * @brief Move constructor.
@@ -203,7 +174,7 @@ public:
     }
 private:
     thing_t    m_type{};
-    std::byte* m_data = nullptr;
+    std::byte* m_data;
 
     allocator_type m_allocator;
 };
@@ -212,11 +183,13 @@ template <typename T>
 class thing_allocator {
     template <typename>
     friend class thing_allocator;
+
+    using dead_things = std::vector<std::pair<T*, std::size_t>>;
 public:
     using value_type = T;
 public:
     explicit thing_allocator(furlang::arena& arena) noexcept
-      : m_arena(&arena) {}
+      : m_arena(&arena), m_deadThings(std::make_shared<dead_things>()) {}
 
     template <typename U>
     thing_allocator(const thing_allocator<U>& other) noexcept
@@ -232,18 +205,26 @@ public:
 
     template <typename U>
     thing_allocator(thing_allocator<U>&& other) noexcept
-      : m_arena(std::move(other.m_arena)) {}
+      : m_arena(std::move(other.m_arena)), m_deadThings(std::move(other.m_deadThings)) {}
 
     template <typename U>
     thing_allocator& operator=(thing_allocator<U>&& other) noexcept {
         if (this == &other) return *this;
         m_arena      = std::move(other.m_arena);
+        m_deadThings = std::move(other.m_deadThings);
         return *this;
     }
 public:
-    [[nodiscard]] T* allocate(std::size_t count = 1) { return m_arena->allocate<T>(count); }
+    [[nodiscard]] T* allocate(std::size_t count = 1) {
+        for (auto it = m_deadThings->begin(); it != m_deadThings->end(); ++it) {
+            if (it->second != count) continue;
+            m_deadThings->erase(it);
+            return it->first;
+        }
+        return m_arena->allocate<T>(count);
+    }
 
-    void deallocate(T* ptr, std::size_t count) noexcept { m_deadThings.emplace_back(ptr, count); }
+    void deallocate(T* ptr, std::size_t count) noexcept { m_deadThings->emplace_back(ptr, count); }
 public:
     template <typename U>
     bool operator==(const thing_allocator<U>& other) const noexcept {
@@ -257,7 +238,7 @@ public:
 private:
     furlang::arena* m_arena;
 
-    std::vector<std::pair<T*, std::size_t>> m_deadThings;
+    std::shared_ptr<dead_things> m_deadThings;
 };
 
 } // namespace furvm

furvm/src/detail/serialization.cpp

@@ -0,0 +1,49 @@
+#include "furvm/detail/serialization.hpp"
+
+#include <ostream>
+
+namespace furvm::detail {
+
+std::ostream& serialize(std::ostream& os, std::int8_t value) {
+    return os << (char)((value >> 0ULL) & 0xFF);
+}
+
+std::ostream& serialize(std::ostream& os, std::int16_t value) {
+    return os << (char)((value >> 0ULL) & 0xFF) << (char)((value >> 8ULL) & 0xFF);
+}
+
+std::ostream& serialize(std::ostream& os, std::int32_t value) {
+    return os << (char)((value >> 0ULL) & 0xFF) << (char)((value >> 8ULL) & 0xFF) << (char)((value >> 16ULL) & 0xFF)
+              << (char)((value >> 24ULL) & 0xFF);
+}
+
+std::ostream& serialize(std::ostream& os, std::int64_t value) {
+    return os << (char)((value >> 0ULL) & 0xFF) << (char)((value >> 8ULL) & 0xFF) << (char)((value >> 16ULL) & 0xFF)
+              << (char)((value >> 24ULL) & 0xFF) << (char)((value >> 32ULL) & 0xFF) << (char)((value >> 40ULL) & 0xFF)
+              << (char)((value >> 48ULL) & 0xFF) << (char)((value >> 56ULL) & 0xFF);
+}
+
+std::ostream& serialize(std::ostream& os, std::uint8_t value) {
+    return os << (char)((value >> 0ULL) & 0xFF);
+}
+
+std::ostream& serialize(std::ostream& os, std::uint16_t value) {
+    return os << (char)((value >> 0ULL) & 0xFF) << (char)((value >> 8ULL) & 0xFF);
+}
+
+std::ostream& serialize(std::ostream& os, std::uint32_t value) {
+    return os << (char)((value >> 0ULL) & 0xFF) << (char)((value >> 8ULL) & 0xFF) << (char)((value >> 16ULL) & 0xFF)
+              << (char)((value >> 24ULL) & 0xFF);
+}
+
+std::ostream& serialize(std::ostream& os, std::uint64_t value) {
+    return os << (char)((value >> 0ULL) & 0xFF) << (char)((value >> 8ULL) & 0xFF) << (char)((value >> 16ULL) & 0xFF)
+              << (char)((value >> 24ULL) & 0xFF) << (char)((value >> 32ULL) & 0xFF) << (char)((value >> 40ULL) & 0xFF)
+              << (char)((value >> 48ULL) & 0xFF) << (char)((value >> 56ULL) & 0xFF);
+}
+
+std::ostream& serialize(std::ostream& os, const std::string& value) {
+    return serialize(os, std::uint16_t(value.size())).write(value.data(), static_cast<std::streamsize>(value.size()));
+}
+
+} // namespace furvm::detail

furvm/src/executor.cpp

@@ -12,9 +12,17 @@
 
 namespace furvm {
 
-void executor::push_frame(const mod_h& mod, const function_h& function) {
-    if (function->type() != function_t::Normal) throw std::runtime_error("unexpected function type");
-    m_frames.emplace((struct executor::frame){ mod, function->position(), m_stack.size() });
+void executor::push_frame(const mod_h& mod, function function) {
+    while (function.type() == function_t::Import) {
+        function = *m_context->module_at(function.imp().mod)->function_at(function.imp().function);
+    }
+    switch (function.type()) {
+    case function_t::Normal: {
+        m_frames.emplace((struct executor::frame){ mod, function.position(), m_stack.size() });
+    } break;
+    case function_t::Native:
+    default: throw std::runtime_error("unexpected function type");
+    }
 }
 
 struct executor::frame executor::pop_frame() {
@@ -70,7 +78,7 @@ void executor::step() {
     switch (instr) {
     case instruction_t::NoOperation: break;
     case instruction_t::PushB2I: {
-        push_thing({ thing_t::Int32, m_context->m_thingAllocator })->int32() = frame.mod->byte(frame.position++);
+        push_thing({ thing_t::Int32, m_context->thing_alloc() })->int32() = frame.mod->byte(frame.position++);
     } break;
     case instruction_t::Drop: {
         pop_thing();
@@ -155,13 +163,9 @@ void executor::step() {
 
         const function_h& function = frame.mod->function_at(funcId);
         switch (function->type()) {
-        case function_t::Normal: push_frame(frame.mod, function); break;
+        case function_t::Normal:
+        case function_t::Import: push_frame(frame.mod, *function); break;
         case function_t::Native: function->native()(*this); break;
-        case function_t::Import: {
-            // const mod_p& impMod = m_context->m_modules.at(function->imported_module());
-            // push_frame(frame.mod, function->imported_function());
-            throw std::runtime_error("unimplemented");
-        } break;
         }
     } break;
     case instruction_t::Jump: {

furvm/src/function.cpp

@@ -10,7 +10,7 @@ function::~function() {
     case function_t::Native:
     default: break;
     case function_t::Import: {
-        m_value.imp.moduleName.~basic_string();
+        m_value.imp.~import_function();
     } break;
     }
 }
@@ -25,8 +25,7 @@ function::function(function&& other) noexcept
         new (&m_value.native) native_function(std::move(other.m_value.native));
     } break;
     case function_t::Import: {
-        m_value.imp.moduleName = std::move(other.m_value.imp.moduleName);
-        m_value.imp.function   = other.m_value.imp.function;
+        m_value.imp = std::move(other.m_value.imp);
     } break;
     }
     other.m_value.position = 0;
@@ -45,8 +44,7 @@ function& function::operator=(function&& other) noexcept {
         new (&m_value.native) native_function(std::move(other.m_value.native));
     } break;
     case function_t::Import: {
-        m_value.imp.moduleName = std::move(other.m_value.imp.moduleName);
-        m_value.imp.function   = other.m_value.imp.function;
+        m_value.imp = std::move(other.m_value.imp);
     } break;
     }
     other.m_value.position = 0;
@@ -64,8 +62,7 @@ function::function(const function& other)
         new (&m_value.native) native_function(other.m_value.native);
     } break;
     case function_t::Import: {
-        m_value.imp.moduleName = other.m_value.imp.moduleName;
-        m_value.imp.function   = other.m_value.imp.function;
+        m_value.imp = other.m_value.imp;
     } break;
     }
 }
@@ -83,8 +80,7 @@ function& function::operator=(const function& other) {
         new (&m_value.native) native_function(other.m_value.native);
     } break;
     case function_t::Import: {
-        m_value.imp.moduleName = other.m_value.imp.moduleName;
-        m_value.imp.function   = other.m_value.imp.function;
+        m_value.imp = other.m_value.imp;
     } break;
     }
 

furvm/src/main.cpp

@@ -6,7 +6,6 @@
 #include "furvm/fwd.hpp"
 #include "furvm/instruction.hpp"
 #include "furvm/module.hpp"
-#include "furvm/serializer.hpp"
 #include "furvm/thing.hpp"
 
 #include <array>
@@ -29,8 +28,10 @@ int main(void) {
     furvm::mod_h      mainModule = context->emplace_module("main", s_bytecode.begin(), s_bytecode.end());
     furvm::function_h mainFunc   = mainModule->emplace_function("main", 0);
 
+    mainModule->serialize(std::cout);
+
     furvm::executor_h executor = context->emplace_executor(context);
-    executor->push_frame(mainModule, mainFunc);
+    executor->push_frame(mainModule, *mainFunc);
 
     static constexpr std::size_t FPC = 3; // Frames per collection
 

furvm/src/module.cpp

@@ -1,3 +1,34 @@
 #include "furvm/module.hpp"
 
-namespace furvm {}
+#include "furvm/detail/serialization.hpp"
+#include "furvm/fwd.hpp"
+
+#include <ios>
+
+namespace furvm {
+
+std::ostream& mod::serialize(std::ostream& os) const {
+    os << MAGIC;
+    detail::serialize(os, std::uint32_t(0)); // version
+
+    detail::serialize(os, function_id(m_functionMap.size()));
+    for (const auto& [name, id] : m_functionMap) {
+        detail::serialize(os, name);
+        function_h func = m_functions.at(id);
+        detail::serialize(os, std::uint8_t(func->type()));
+        switch (func->type()) {
+        case function_t::Normal: {
+            detail::serialize(os, func->position());
+        } break;
+        case function_t::Native: break;
+        case function_t::Import: {
+            detail::serialize(os, func->imp().mod);
+            detail::serialize(os, func->imp().function);
+        } 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()));
+}
+} // namespace furvm

furvm/src/serializer.cpp

@@ -1,100 +0,0 @@
-#include "furvm/serializer.hpp"
-
-#include "furvm/function.hpp" // IWYU pragma: keep
-#include "furvm/fwd.hpp"
-#include "furvm/module.hpp" // IWYU pragma: keep
-
-#include <istream>
-#include <ostream>
-
-namespace furvm {
-
-template <typename T>
-static inline void write_raw(std::ostream& os, const T& value) {
-    os.write(reinterpret_cast<const char*>(&value), sizeof(T));
-}
-
-template <typename T>
-static inline void read_raw(std::istream& is, T& value) {
-    is.read(reinterpret_cast<char*>(&value), sizeof(T));
-}
-
-static inline void write_u64(std::ostream& os, std::uint64_t value) {
-    os.put(static_cast<char>((value >> 0ULL) & 0xFF));
-    os.put(static_cast<char>((value >> 8ULL) & 0xFF));
-    os.put(static_cast<char>((value >> 16ULL) & 0xFF));
-    os.put(static_cast<char>((value >> 24ULL) & 0xFF));
-    os.put(static_cast<char>((value >> 32ULL) & 0xFF));
-    os.put(static_cast<char>((value >> 40ULL) & 0xFF));
-    os.put(static_cast<char>((value >> 48ULL) & 0xFF));
-    os.put(static_cast<char>((value >> 56ULL) & 0xFF));
-}
-
-static inline void read_u64(std::istream& is, std::uint64_t& value) {
-    value = (static_cast<std::uint64_t>(is.get()) << 0) | (static_cast<std::uint64_t>(is.get()) << 8) |
-            (static_cast<std::uint64_t>(is.get()) << 16) | (static_cast<std::uint64_t>(is.get()) << 24) |
-            (static_cast<std::uint64_t>(is.get()) << 32) | (static_cast<std::uint64_t>(is.get()) << 40) |
-            (static_cast<std::uint64_t>(is.get()) << 48) | (static_cast<std::uint64_t>(is.get()) << 56);
-}
-
-static inline void write_u32(std::ostream& os, std::uint32_t value) {
-    os.put(static_cast<char>((value >> 0ULL) & 0xFF));
-    os.put(static_cast<char>((value >> 8ULL) & 0xFF));
-    os.put(static_cast<char>((value >> 16ULL) & 0xFF));
-    os.put(static_cast<char>((value >> 24ULL) & 0xFF));
-}
-
-static inline void read_u32(std::istream& is, std::uint32_t& value) {
-    value = static_cast<std::uint32_t>(is.get() << 0) | static_cast<std::uint32_t>(is.get() << 8) |
-            static_cast<std::uint32_t>(is.get() << 16) | static_cast<std::uint32_t>(is.get() << 24);
-}
-
-static inline void write_u16(std::ostream& os, std::uint16_t value) {
-    os.put(static_cast<char>((value >> 0ULL) & 0xFF));
-    os.put(static_cast<char>((value >> 8ULL) & 0xFF));
-}
-
-static inline void read_u16(std::istream& is, std::uint16_t& value) {
-    value = static_cast<std::uint16_t>(is.get() << 0) | static_cast<std::uint16_t>(is.get() << 8);
-}
-
-static inline void write_u8(std::ostream& os, std::uint8_t value) {
-    os.put(static_cast<char>((value >> 0ULL) & 0xFF));
-}
-
-static inline void read_u8(std::istream& is, std::uint8_t& value) {
-    value = static_cast<std::uint8_t>(is.get() << 0);
-}
-
-bool serializer::serialize_module(std::ostream& os, const mod_p& mod) {
-    // os.write(reinterpret_cast<const char*>(MODULE_MAGIC), sizeof(MODULE_MAGIC));
-    // write_u32(os, VERSION);
-
-    // write_u32(os, mod->m_functions.size());
-    // for (function_id id = 0; id < static_cast<function_id>(mod->m_functions.size()); ++id) {
-    // const auto& func = mod->function_at(id);
-    // write_u16(os, id);
-    // write_u8(os, static_cast<std::uint8_t>(func->type()));
-    // switch (func->type()) {
-    // case function_t::Normal: {
-    // write_u64(os, func->position());
-    // } break;
-    // case function_t::Native: {
-    // // TODO: Replace with a reference to the function's name from constant pool
-    // throw std::runtime_error("cannot serialize native functions yet");
-    // } break;
-    // case function_t::Import: {
-    // // TODO: Replace with a reference to the module's and function's name from constant pool
-    // throw std::runtime_error("cannot serialize import functions yet");
-    // } break;
-    // }
-    // }
-
-    // write_u64(os, mod->m_bytecode.size());
-    // os.write(reinterpret_cast<const char*>(mod->m_bytecode.data()),
-    // static_cast<std::streamsize>(mod->m_bytecode.size()));
-
-    return false;
-}
-
-} // namespace furvm