Started with Primitive support

- also more complete implementation of Class
Signed-off-by: Stefan Marr <git@stefan-marr.de>

src/som/primitives/object_primitives.py

+from som.primitives.primitives import Primitives
+
+from som.vmobjects.primitive import Primitive
+from som.vmobjects.array     import Array 
+
+class ObjectPrimitives(Primitives):
+    
+    def install_primitives(self):
+        def _equals(self, frame, interpreter):
+            op1 = frame.pop()
+            op2 = frame.pop()
+            if op1 is op2:
+                frame.push(self._universe.trueObject)
+            else:
+                frame.push(self._universe.falseObject)
+        self._install_instance_primitive(Primitive("==", self._universe, _equals))
+        
+        def _hashcode(self, frame, interpreter):
+            rcvr = frame.pop()
+            frame.push(self._universe.new_integer(hash(rcvr)))
+        self._install_instance_primitive(Primitive("hashcode", self._universe, _hashcode))
+
+
+        def _objectSize(self, frame, interpreter):
+            rcvr = frame.pop()
+            size = rcvr.get_number_of_fields()
+            if isinstance(rcvr, Array):
+                size += rcvr.get_number_of_indexable_fields()
+        
+            frame.push(self._universe.new_integer(size))
+        self._install_instance_primitive(Primitive("objectSize", self._universe, _objectSize))
+
+        def _perform(self, frame, interpreter):
+            selector = frame.pop()
+            rcvr     = frame.get_stack_element(0)
+
+            invokable = rcvr.get_class().lookup_invokable(selector)
+            invokable.invoke(frame, interpreter)
+        self._install_instance_primitive(Primitive("perform:", self._universe, _perform))
+
+        def _performInSuperclass(self, frame, interpreter):
+            clazz    = frame.pop()
+            selector = frame.pop()
+            rcvr     = frame.get_stack_element(0)
+
+            invokable = clazz.lookup_invokable(selector)
+            invokable.invoke(frame, interpreter)
+        self._install_instance_primitive(Primitive("perform:inSuperclass:", self._universe, _performInSuperclass))
+
+        def _performWithArguments(self, frame, interpreter):
+            args     = frame.pop()
+            selector = frame.pop()
+            rcvr     = frame.get_stack_element(0)
+
+            for i in range(0, args.get_number_of_indexable_fields()):
+                frame.push(args.get_indexable_field(i))
+
+            invokable = rcvr.get_class().lookup_invokable(selector)
+            invokable.invoke(frame, interpreter)
+        self._install_instance_primitive(Primitive("perform:withArguments:", self._universe, _performWithArguments))
+
+        def _instVarAt(self, frame, interpreter):
+            idx  = frame.pop()
+            rcvr = frame.pop()
+
+            frame.push(rcvr.get_field(idx.get_embedded_integer() - 1))
+        self._install_instance_primitive(Primitive("instVarAt:", self._universe, _instVarAt))
+
+        def _instVarAtPut(self, frame, interpreter):
+            val  = frame.pop()
+            idx  = frame.pop()
+            rcvr = frame.get_stack_element(0)
+
+            rcvr.set_field(idx.get_embedded_integer() - 1, val)
+        self._install_instance_primitive(Primitive("instVarAt:put:", self._universe, _instVarAtPut))

src/som/primitives/primitives.py

+class Primitives(object):
+
+    def __init__(self, universe):
+        self._universe = universe
+        self._holder = None
+
+    def install_primitives_in(self, value):
+        # Save a reference to the holder class
+        self._holder = value
+
+        # Install the primitives from this primitives class
+        self.install_primitives()
+        
+    def install_primitives(self):
+        raise NotImplementedError()
+
+    def _install_instance_primitive(self, primitive):
+        # Install the given primitive as an instance primitive in the holder class
+        self._holder.add_instance_primitive(primitive)
+
+    def _install_class_primitive(self, primitive):
+        # Install the given primitive as an instance primitive in the class of
+        # the holder class
+        self._holder.get_class().add_instance_primitive(primitive)

src/som/vm/universe.py

 from __future__ import print_function
 
 from som.interpreter.interpreter import Interpreter
+from som.interpreter.bytecodes   import Bytecodes 
 from som.vm.symbol_table         import SymbolTable
 from som.vmobjects.object        import Object
 from som.vmobjects.clazz         import Class
 from som.vmobjects.array         import Array
 from som.vmobjects.symbol        import Symbol
 from som.vmobjects.method        import Method
-from som.vmobjects.integer       import Integer   
+from som.vmobjects.integer       import Integer
+from som.vmobjects.string        import String    
 
 import som.compiler.sourcecode_compiler as sourcecode_compiler
 
@@ -48,6 +50,10 @@ class Universe(object):
     @property
     def nilObject(self):
         return self._nilObject
+    
+    @property
+    def primitiveClass(self):
+        return self._primitiveClass
         
     
     def _create_bootstrap_method(self):

src/som/vmobjects/clazz.py

-from som.vmobjects.object import Object
+from som.vmobjects.object      import Object
+from som.primitives.primitives import Primitives
+
+from importlib import import_module
+import inspect
 
 class Class(Object):
     
@@ -112,6 +116,40 @@ class Class(Object):
 
         # Field not found
         return -1
+
+
+    def add_instance_invokable(self, value):
+        # Add the given invokable to the array of instance invokables
+        for i in range(0, self.get_number_of_instance_invokables()):
+            # Get the next invokable in the instance invokable array
+            invokable = self.get_instance_invokable(i)
+  
+            # Replace the invokable with the given one if the signature matches
+            if invokable.get_signature() == value.get_signature():
+                self.set_instance_invokable(i, value)
+                return False
+  
+        # Append the given method to the array of instance methods
+        self.set_instance_invokables(self.get_instance_invokables().copy_and_extend_with(value, self._universe))
+        return True
+  
+    def add_instance_primitive(self, value):
+        if self.add_instance_invokable(value):
+            self._universe.std_print("Warning: Primitive " + value.get_signature().get_string())
+            self._universe.std_println(" is not in class definition for class " + self.get_name().get_string())
+  
+    def get_instance_field_name(self, index):
+        # Get the name of the instance field with the given index
+        if index >= self._get_number_of_super_instance_fields():
+            # Adjust the index to account for fields defined in the super class
+            index -= self._get_number_of_super_instance_fields()
+  
+            # Return the symbol representing the instance fields name
+            return self.get_instance_fields().get_indexable_field(index)
+        else:
+            # Ask the super class to return the name of the instance field
+            return self.get_super_class().get_instance_field_name(index)
+ 
     def get_number_of_instance_fields(self):
         # Get the total number of instance fields in this class
         return (self.get_instance_fields().get_number_of_indexable_fields() +
@@ -126,11 +164,31 @@ class Class(Object):
   
     def has_primitives(self):
         # Lookup invokable with given signature in array of instance invokables
-        for invokable in self.get_instance_invokables():
-            if invokable.is_primitive():
+        for i in range(0, self.get_number_of_instance_invokables()):
+            # Get the next invokable in the instance invokable array
+            if self.get_instance_invokable(i).is_primitive():
                 return True
         
         return False
+  
+    def load_primitives(self):
+        # determine module name for the primitives of the class
+        module_name = "som.primitives." + self.get_name().get_string().lower() + "_primitives"
+        
+        # Try loading the primitives
+        module = import_module(module_name)
+        for name, element in inspect.getmembers(module):
+            if (inspect.isclass(element) and 
+                  issubclass(element, Primitives) and
+                  element is not Primitives):
+                element(self._universe).install_primitives_in(self)
+  
+    def replace_bytecodes(self):
+        cnt = self.get_number_of_instance_invokables()
+        for i in range(0, cnt):
+            inv = self.get_instance_invokable(i)
+            if not inv.is_primitive():
+                inv.replace_bytecodes()  
 
     def __str__(self):
         return "Class(" + self.get_name().get_string() + ")"