removed unnecessary OOP stuff

src/Mono/Assembly.cpp

@@ -7,17 +7,11 @@ Assembly::Assembly(MonoAssembly *ptr)
 {
 }
 
-Assembly::~Assembly(){
+MonoClass* Assembly::getClass(const std::string &name_space, const std::string &name){
-    // Tt causes SEGFAULT.
+    auto c = mono_class_from_name(image, name_space.c_str(), name.c_str());
-    // Is it even possible to unload assembly from domain?
+    if(!c)
-    // mono_assembly_close(ptr);
+        throw UsefulException(format("can't get class '%s.%s'", name_space.c_str(), name.c_str()));
-}
+    return c;
-
-std::shared_ptr<Class> Assembly::getClass(const std::string &name_space, const std::string &name){
-    MonoClass* ptr = mono_class_from_name(image, name_space.c_str(), name.c_str());
-    if(!ptr)
-        throw UsefulException(format("can't find class '%s.%s'", name_space.c_str(), name.c_str()));
-    return std::make_shared<Class>(ptr, name_space, name);
 }
 
 }

src/Mono/Class.cpp

@@ -1,33 +0,0 @@
-#include "Mono.hpp"
-
-namespace Mono {
-
-Class::Class(MonoClass *ptr, const std::string& name_space, const std::string& name)
-    : ptr(ptr), name_space(name_space), name(name)
-{
-    void* iter = nullptr;
-    MonoMethod* m = nullptr;
-    while( (m = mono_class_get_methods(ptr, &iter)) ){
-        auto name = std::string_view(mono_method_get_name(m));
-        methods.emplace(std::piecewise_construct,
-            std::forward_as_tuple(name),
-            std::forward_as_tuple(m, name));
-    }
-}
-
-
-template<>
-void* _valueToVoidPtr<Object>(Object& v){ return v; }
-template<>
-void* _valueToVoidPtr<String>(String& v){ return v; }
-
-template<>
-Object _valueFromMonoObject<Object>(MonoObject* o){
-    return (Object)o;
-}
-template<>
-String _valueFromMonoObject<String>(MonoObject* o){
-    return (String)((void*)o);
-}
-
-}

src/Mono/Method.cpp

@@ -1,16 +0,0 @@
-#include "Mono.hpp"
-
-namespace Mono {
-
-Method::Method(MonoMethod *ptr, const std::string_view& name)
-    : ptr(ptr), signature(mono_method_signature(ptr)), name(name)
-{
-    void* iter = nullptr;
-    return_type = mono_signature_get_return_type(signature);
-    MonoType* pt = nullptr;
-    while( (pt = mono_signature_get_params(signature, &iter)) ){
-        argument_types.push_back(pt);
-    }
-}
-
-}

src/Mono/Mono.hpp

@@ -28,94 +28,91 @@ typedef char16_t Char;
 typedef MonoString* String;
 typedef MonoObject* Object;
 typedef void Void;
+
 template<typename PrimitiveT>
 MonoClass* getClass(); 
 
-class Method {
+template<typename T>
-public:
+void* valueToVoidPtr(T& v){ return &v; }
-    MonoMethod* ptr;
+template<>
-    MonoMethodSignature* signature;
+inline void* valueToVoidPtr<Object>(Object& v){ return v; }
-    const std::string_view name;
+template<>
-    MonoType* return_type;
+inline void* valueToVoidPtr<String>(String& v){ return v; }
-    std::vector<MonoType*> argument_types;
-
-    Method(MonoMethod* ptr, const std::string_view& name);
-};
-
 
 template<typename T>
-void* _valueToVoidPtr(T& v){
+T valueFromMonoObject(MonoObject* o){
-    return &v;
-}
-template<typename T>
-T _valueFromMonoObject(MonoObject* o){
     void* result_value_ptr = mono_object_unbox(o);
     if(result_value_ptr == nullptr)
         throw UsefulException("can't unbox method value");
     return *((T*)result_value_ptr);
 }
+template<>
+inline Object valueFromMonoObject<Object>(MonoObject* o){ return o; }
+template<>
+inline String valueFromMonoObject<String>(MonoObject* o){ return (String)((void*)o); }
 
-class Class {
+void getMethodSignatureTypes(MonoMethod* mono_method,
+        MonoType** return_type,
+        std::vector<MonoType*>& argument_types);
 
-public:
+/// @brief all types must have template implementation of getClass<T>()
-    std::multimap<std::string_view, Method> methods;
+/// @tparam ReturnT return type
-    MonoClass* ptr;
+/// @tparam ...ArgTypes argument types
-    const std::string name_space;
+/// @return function which takes arguments and returns value of ReturnT
-    const std::string name;
+template<typename ReturnT, typename... ArgTypes>
+std::shared_ptr<std::function<ReturnT(MonoObject*, ArgTypes...)>> getMethod(
+    MonoClass* target_class,
+    const std::string& name)
+{
+    static MonoClass* arg_classes[] = { getClass<ArgTypes>()... };
+    static MonoClass* return_class = getClass<ReturnT>();
+    if(target_class == nullptr)
+        throw UsefulException("target_class is nullptr");
     
-    Class(MonoClass* ptr, const std::string& name_space, const std::string& name);
+    // iterate each method
-    Class(const Class&) = delete;
+    void* iter = nullptr;
-    
+    MonoMethod* m = nullptr;
-    /// @brief all types must have template implementation of getClass<T>()
+    MonoType* return_type = nullptr;
-    /// @tparam ReturnT return type
+    std::vector<MonoType*> argument_types;
-    /// @tparam ...ArgTypes argument types
+    while( (m = mono_class_get_methods(target_class, &iter)) ){
-    /// @return function which takes arguments and returns value of ReturnT
+        argument_types.clear();
-    template<typename ReturnT, typename... ArgTypes>
+        getMethodSignatureTypes(m, &return_type, argument_types);
-    std::shared_ptr<std::function<ReturnT(MonoObject*, ArgTypes...)>> getMethod(const std::string& name){
+        // compare argument count
-        Method* m = nullptr;
+        if(argument_types.size() != sizeof...(ArgTypes))
-        static std::vector<MonoClass*> arg_classes { getClass<ArgTypes>()... };
+            continue;
-        // iterate each method overload
+        // compare return type
-        for(auto it = methods.find(name); it != methods.end(); it++){
+        if(!mono_metadata_type_equal(return_type, mono_class_get_type(return_class)))
-            m = &it->second;
+            continue;
-            // compare argument count
+        // compare argument types
-            if(m->argument_types.size() != arg_classes.size())
+        bool argument_types_mismatch = false;
-                continue;
+        for(size_t i = 0; i < sizeof...(ArgTypes); i++){
-            // compare return type
+            if(!mono_metadata_type_equal(argument_types[i], mono_class_get_type(arg_classes[i]))){
-            if(!mono_metadata_type_equal(m->return_type, mono_class_get_type(getClass<ReturnT>())))
+                argument_types_mismatch = true;
-                continue;
+                break;
-            // compare argument types
-            bool argument_types_mismatch = false;
-            for(size_t i = 0; i < arg_classes.size(); i++){
-                if(!mono_metadata_type_equal(m->argument_types[i], mono_class_get_type(arg_classes[i]))){
-                    argument_types_mismatch = true;
-                    break;
-                }
             }
-            if(argument_types_mismatch)
-                continue;
-            // passed all tests successfully
-            break;
         }
-
+        if(argument_types_mismatch)
-        // if method not found throw exception
+            continue;
-        if(m == nullptr)
+        // passed all tests successfully
-            throw UsefulException(format("can't get method '%s' from class '%s'",
+        break;
-                name.c_str(), this->name.c_str()));
-
-        MonoMethod* m_ptr = m->ptr;
-        return std::make_shared<std::function<ReturnT(MonoObject*, ArgTypes...)>>(
-            [m_ptr](MonoObject* class_instance, ArgTypes... args) -> ReturnT 
-            {
-                void* arg_array[] = { _valueToVoidPtr(args)..., nullptr };
-                // MonoException* ex = nullptr;
-                // TODO: exception catch
-                MonoObject* result = mono_runtime_invoke(m_ptr, class_instance, arg_array, nullptr);
-                return _valueFromMonoObject<ReturnT>(result);
-            }
-        );
     }
-};
 
+    // if method not found throw exception
+    if(m == nullptr)
+        throw UsefulException(format("can't get method '%s' from class '%s'",
+            name.c_str(), mono_class_get_name(target_class)));
+
+    return std::make_shared<std::function<ReturnT(MonoObject*, ArgTypes...)>>(
+        [m](MonoObject* class_instance, ArgTypes... args) -> ReturnT 
+        {
+            void* arg_array[] = { valueToVoidPtr(args)..., nullptr };
+            // MonoException* ex = nullptr;
+            // TODO: exception catch
+            MonoObject* result = mono_runtime_invoke(m, class_instance, arg_array, nullptr);
+            return valueFromMonoObject<ReturnT>(result);
+        }
+    );
+}
 
 class Assembly {
     MonoAssembly* ptr;
@@ -124,9 +121,8 @@ class Assembly {
 public:
     Assembly(MonoAssembly* ptr);
     Assembly(const Assembly&) = delete;
-    ~Assembly();
     
-    std::shared_ptr<Class> getClass(const std::string& name_space, const std::string& name);
+    MonoClass* getClass(const std::string& name_space, const std::string& name);
 };
 
 ///LINUX: `config.xml`, `mscorelib.dll`, `libmono-native.so` in `mono-libs` directory

src/Mono/Runtime.cpp

@@ -25,4 +25,17 @@ std::shared_ptr<Assembly> RuntimeJIT::loadAssembly(const std::string &name){
     return std::make_shared<Assembly>(ptr);
 }
 
+void getMethodSignatureTypes(MonoMethod* mono_method,
+        MonoType** return_type,
+        std::vector<MonoType*>& argument_types)
+{
+    auto signature = mono_method_signature(mono_method);
+    void* iter = nullptr;
+    *return_type = mono_signature_get_return_type(signature);
+    MonoType* pt = nullptr;
+    while( (pt = mono_signature_get_params(signature, &iter)) ){
+        argument_types.push_back(pt);
+    }
+}
+
 }

src/main.cpp

@@ -21,7 +21,7 @@ int main(int argc, const char** argv){
         Mono::RuntimeJIT mono;
         auto a = mono.loadAssembly("app.exe");
         auto c = a->getClass("", "A");
-        auto m = c->getMethod<Mono::Int, Mono::Byte, Mono::Float>("Method");
+        auto m = Mono::getMethod<Mono::Int, Mono::Byte, Mono::Float>(c, "Method");
         std::cout<<"method has been found"<<std::endl;
         Mono::Int r = m->operator()(nullptr, 16, 0.32);
         std::cout<<"result: "<<r<<std::endl;