method buffer added to classes

and also allocation/de-allocation callbacks were added to newClass
function and yet registering attribute getters and setters is to do.

cli/main.c

@@ -188,8 +188,7 @@ int main(int argc, const char** argv) {
   user_data.repl_mode = false;
   pkSetUserData(vm, &user_data);
 
-  registerModulePath(vm);
-  //REGISTER_ALL_MODULES(vm);
+  REGISTER_ALL_MODULES(vm);
 
   PkCompileOptions options = pkNewCompilerOptions();
   options.debug = debug;

cli/modules/std_io.c

@@ -6,6 +6,10 @@
 
 #include "modules.h"
 
+/*****************************************************************************/
+/* FILE CLASS                                                                */
+/*****************************************************************************/
+
  // Str  | If already exists | If does not exist |
  // -----+-------------------+-------------------|
  // 'r'  |  read from start  |   failure to open |
@@ -31,26 +35,21 @@ typedef struct {
   bool closed;         // True if the file isn't closed yet.
 } File;
 
-/*****************************************************************************/
-/* FILE OBJECT OPERATORS                                                     */
-/*****************************************************************************/
-
-void fileGetAttrib(PKVM* vm, File* file, const char* attrib) {
-  if (strcmp(attrib, "closed") == 0) {
-    pkReturnBool(vm, file->closed);
-    return;
-  }
+void* _newFile() {
+  File* file = NEW_OBJ(File);
+  file->closed = true;
+  file->mode = FMODE_NONE;
+  file->fp = NULL;
+  return file;
 }
 
-bool fileSetAttrib(PKVM* vm, File* file, const char* attrib) {
-  return false;
-}
-
-void fileClean(PKVM* vm, File* file) {
+void _deleteFile(void* ptr) {
+  File* file = (File*)ptr;
   if (!file->closed) {
     if (fclose(file->fp) != 0) { /* TODO: error! */ }
     file->closed = true;
   }
+  FREE_OBJ(file);
 }
 
 /*****************************************************************************/
@@ -171,7 +170,7 @@ static void _fileClose(PKVM* vm) {
 void registerModuleIO(PKVM* vm) {
   PkHandle* io = pkNewModule(vm, "io");
 
-  PkHandle* cls_file = pkNewClass(vm, NULL, io, "File");
+  PkHandle* cls_file = pkNewClass(vm, "File", NULL, io, _newFile, _deleteFile);
   pkClassAddMethod(vm, cls_file, "open",  _fileOpen, -1);
   pkClassAddMethod(vm, cls_file, "read",  _fileRead,  0);
   pkClassAddMethod(vm, cls_file, "write", _fileWrite, 1);

src/include/pocketlang.h

@@ -127,6 +127,15 @@ typedef PkStringPtr (*pkResolvePathFn) (PKVM* vm, const char* from,
 // to indicate if it's failed to load the script.
 typedef PkStringPtr (*pkLoadScriptFn) (PKVM* vm, const char* path);
 
+// A function callback to allocate and return a new instance of the registered
+// class. Which will be called when the instance is constructed. The returned/
+// data is expected to be alive till the delete callback occurs.
+typedef void* (*pkNewInstanceFn) ();
+
+// A function callback to de-allocate the aloocated native instance of the
+// registered class.
+typedef void (*pkDeleteInstanceFn) (void*);
+
 /*****************************************************************************/
 /* POCKETLANG TYPES                                                          */
 /*****************************************************************************/
@@ -289,8 +298,10 @@ PK_PUBLIC void pkRegisterModule(PKVM* vm, PkHandle* module);
 
 // Create a new class on the [module] with the [name] and return it.
 // If the [base_class] is NULL by default it'll set to "Object" class.
-PK_PUBLIC PkHandle* pkNewClass(PKVM* vm, PkHandle* base_class,
-                               PkHandle* module, const char* name);
+PK_PUBLIC PkHandle* pkNewClass(PKVM* vm, const char* name,
+                               PkHandle* base_class, PkHandle* module,
+                               pkNewInstanceFn new_fn,
+                               pkDeleteInstanceFn delete_fn);
 
 // Add a native method to the given class. If the [arity] is -1 that means
 // the method has variadic parameters and use pkGetArgc() to get the argc.

src/pk_core.c

@@ -69,8 +69,10 @@ void pkRegisterModule(PKVM* vm, PkHandle* module) {
   vmRegisterModule(vm, module_, module_->name);
 }
 
-PkHandle* pkNewClass(PKVM* vm, PkHandle* base_class, PkHandle* module,
-                     const char* name) {
+PkHandle* pkNewClass(PKVM* vm, const char* name,
+                     PkHandle* base_class, PkHandle* module,
+                     pkNewInstanceFn new_fn,
+                     pkDeleteInstanceFn delete_fn) {
   CHECK_NULL(module);
   CHECK_NULL(name);
   CHECK_TYPE(module, OBJ_MODULE);
@@ -84,6 +86,9 @@ PkHandle* pkNewClass(PKVM* vm, PkHandle* base_class, PkHandle* module,
   Class* class_ = newClass(vm, name, (int)strlen(name),
                            super, (Module*)AS_OBJ(module->value),
                            NULL, NULL);
+  class_->new_fn = new_fn;
+  class_->delete_fn = delete_fn;
+
   return vmNewHandle(vm, VAR_OBJ(class_));
 }
 
@@ -92,9 +97,21 @@ void pkClassAddMethod(PKVM* vm, PkHandle* cls,
                       pkNativeFn fptr, int arity) {
   CHECK_NULL(cls);
   CHECK_NULL(fptr);
-  CHECK_TYPE(cls, OBJ_MODULE);
+  CHECK_TYPE(cls, OBJ_CLASS);
 
-  TODO;
+  Class* class_ = (Class*)AS_OBJ(cls->value);
+
+  Function* fn = newFunction(vm, name, (int)strlen(name),
+                             class_->owner, true, NULL, NULL);
+
+  // No need to push the function to temp references of the VM
+  // since it's written to the constant pool of the module and the module
+  // won't be garbage collected (class handle has reference to the module).
+
+  Closure* method = newClosure(vm, fn);
+  vmPushTempRef(vm, &method->_super); // method.
+  pkClosureBufferWrite(&class_->methods, vm, method);
+  vmPopTempRef(vm); // method.
 }
 
 void* pkGetSelf(const PKVM* vm) {

src/pk_value.c

@@ -94,6 +94,7 @@ DEFINE_BUFFER(Uint, uint32_t)
 DEFINE_BUFFER(Byte, uint8_t)
 DEFINE_BUFFER(Var, Var)
 DEFINE_BUFFER(String, String*)
+DEFINE_BUFFER(Closure, Closure*)
 
 void pkByteBufferAddString(pkByteBuffer* self, PKVM* vm, const char* str,
                            uint32_t length) {
@@ -146,6 +147,13 @@ void markStringBuffer(PKVM* vm, pkStringBuffer* self) {
   }
 }
 
+void markClosureBuffer(PKVM* vm, pkClosureBuffer* self) {
+  if (self == NULL) return;
+  for (uint32_t i = 0; i < self->count; i++) {
+    markObject(vm, &self->data[i]->_super);
+  }
+}
+
 static void popMarkedObjectsInternal(Object* obj, PKVM* vm) {
   // TODO: trace here.
 
@@ -271,6 +279,10 @@ static void popMarkedObjectsInternal(Object* obj, PKVM* vm) {
       markObject(vm, &cls->owner->_super);
       markObject(vm, &cls->ctor->_super);
       markObject(vm, &cls->name->_super);
+
+      markClosureBuffer(vm, &cls->methods);
+      vm->bytes_allocated += sizeof(Closure) * cls->methods.capacity;
+
     } break;
 
     case OBJ_INST:
@@ -500,10 +512,14 @@ Class* newClass(PKVM* vm, const char* name, int length,
 
   vmPushTempRef(vm, &cls->_super); // class.
 
+  pkClosureBufferInit(&cls->methods);
+
   cls->owner = NULL;
   cls->super_class = super;
   cls->docstring = NULL;
   cls->ctor = NULL;
+  cls->new_fn = NULL;
+  cls->delete_fn = NULL;
 
   // Builtin types doesn't belongs to a module.
   if (module != NULL) {
@@ -523,7 +539,13 @@ Instance* newInstance(PKVM* vm, Class* cls) {
   Instance* inst = ALLOCATE(vm, Instance);
   varInitObject(&inst->_super, vm, OBJ_INST);
   inst->cls = cls;
-  inst->native = NULL;
+  if (cls->new_fn != NULL) {
+    vmPushTempRef(vm, &inst->_super); // inst.
+    inst->native = cls->new_fn();
+    vmPopTempRef(vm); // inst.
+  } else {
+    inst->native = NULL;
+  }
   return inst;
 }
 
@@ -1016,12 +1038,13 @@ void freeObject(PKVM* vm, Object* self) {
 
     case OBJ_CLASS: {
       Class* cls = (Class*)self;
+      pkClosureBufferClear(&cls->methods, vm);
     } break;
 
     case OBJ_INST: {
       Instance* inst = (Instance*)self;
-      if (inst->native) {
-        TODO; // Call native clean function.
+      if (inst->cls->delete_fn != NULL) {
+        inst->cls->delete_fn(inst->native);
       }
     } break;
   }

src/pk_value.h

@@ -200,6 +200,7 @@ DECLARE_BUFFER(Uint, uint32_t)
 DECLARE_BUFFER(Byte, uint8_t)
 DECLARE_BUFFER(Var, Var)
 DECLARE_BUFFER(String, String*)
+DECLARE_BUFFER(Closure, Closure*)
 
 // Add all the characters to the buffer, byte buffer can also be used as a
 // buffer to write string (like a string stream). Note that this will not
@@ -494,6 +495,15 @@ struct Class {
   const char* docstring;
 
   Closure* ctor; //< The constructor function.
+
+  // A buffer of methods of the class.
+  pkClosureBuffer methods;
+
+  // Allocater and de-allocator functions for native types.
+  // For script/ builtin types it'll be NULL.
+  pkNewInstanceFn new_fn;
+  pkDeleteInstanceFn delete_fn;
+
 };
 
 typedef struct {