Esempio n. 1
0
        private void EvalInstruction()
        {
            if (instruction.Location != null)
            {
                currentLocation = instruction.Location;
            }

            switch (instruction.OperationCode)
            {
            case Opcode.Pop:
            {
                Pop();
                break;
            }

            case Opcode.Dup:
            {
                IodineObject val = Pop();
                Push(val);
                Push(val);
                break;
            }

            case Opcode.LoadConst:
            {
                Push(Top.Module.ConstantPool [instruction.Argument]);
                break;
            }

            case Opcode.LoadNull:
            {
                Push(IodineNull.Instance);
                break;
            }

            case Opcode.LoadSelf:
            {
                Push(Top.Self);
                break;
            }

            case Opcode.LoadTrue:
            {
                Push(IodineBool.True);
                break;
            }

            case Opcode.LoadException:
            {
                Push(lastException);
                break;
            }

            case Opcode.LoadFalse:
            {
                Push(IodineBool.False);
                break;
            }

            case Opcode.StoreLocal:
            {
                string name = ((IodineName)Top.Module.ConstantPool [instruction.Argument]).Value;
                Top.StoreLocal(name, Pop());
                break;
            }

            case Opcode.LoadLocal:
            {
                string name = ((IodineName)Top.Module.ConstantPool [instruction.Argument]).Value;
                Push(Top.LoadLocal(name));
                break;
            }

            case Opcode.StoreGlobal:
            {
                string name = ((IodineName)Top.Module.ConstantPool [instruction.Argument]).Value;
                Top.Module.SetAttribute(this, name, Pop());
                break;
            }

            case Opcode.LoadGlobal:
            {
                string name = ((IodineName)Top.Module.ConstantPool [instruction.Argument]).Value;
                if (name == "_")
                {
                    Push(Top.Module);
                }
                else if (Top.Module.Attributes.ContainsKey(name))
                {
                    Push(Top.Module.GetAttribute(this, name));
                }
                else
                {
                    RaiseException(new IodineAttributeNotFoundException(name));
                }
                break;
            }

            case Opcode.StoreAttribute:
            {
                IodineObject target    = Pop();
                IodineObject value     = Pop();
                string       attribute = ((IodineName)Top.Module.ConstantPool [instruction.Argument]).Value;
                if (target.Attributes.ContainsKey(attribute) &&
                    target.Attributes [attribute] is IIodineProperty)
                {
                    IIodineProperty property = (IIodineProperty)target.Attributes [attribute];
                    property.Set(this, value);
                    break;
                }
                target.SetAttribute(this, attribute, value);
                break;
            }

            case Opcode.LoadAttribute:
            {
                IodineObject target    = Pop();
                string       attribute = ((IodineName)Top.Module.ConstantPool [instruction.Argument]).Value;
                if (target.Attributes.ContainsKey(attribute) &&
                    target.Attributes [attribute] is IIodineProperty)
                {
                    IIodineProperty property = (IIodineProperty)target.Attributes [attribute];
                    Push(property.Get(this));
                    break;
                }
                Push(target.GetAttribute(this, attribute));
                break;
            }

            case Opcode.LoadAttributeOrNull:
            {
                IodineObject target    = Pop();
                string       attribute = ((IodineName)Top.Module.ConstantPool [instruction.Argument]).Value;
                if (target.Attributes.ContainsKey(attribute))
                {
                    Push(target.GetAttribute(this, attribute));
                }
                else
                {
                    Push(IodineNull.Instance);
                }
                break;
            }

            case Opcode.StoreIndex:
            {
                IodineObject index  = Pop();
                IodineObject target = Pop();
                IodineObject value  = Pop();
                target.SetIndex(this, index, value);
                break;
            }

            case Opcode.LoadIndex:
            {
                IodineObject index  = Pop();
                IodineObject target = Pop();
                Push(target.GetIndex(this, index));
                break;
            }

            case Opcode.CastLocal:
            {
                IodineTypeDefinition type = Pop() as IodineTypeDefinition;
                string       name         = ((IodineName)Top.Module.ConstantPool [instruction.Argument]).Value;
                IodineObject o            = Top.LoadLocal(name);
                if (type == null)
                {
                    RaiseException(new IodineTypeException("TypeDef"));
                    break;
                }
                if (o.InstanceOf(type))
                {
                    Push(o);
                }
                else
                {
                    RaiseException(new IodineTypeException(type.Name));
                }
                break;
            }

            case Opcode.BinOp:
            {
                IodineObject op2 = Pop();
                IodineObject op1 = Pop();
                Push(op1.PerformBinaryOperation(this,
                                                (BinaryOperation)instruction.Argument,
                                                op2
                                                ));
                break;
            }

            case Opcode.UnaryOp:
            {
                Push(Pop().PerformUnaryOperation(this,
                                                 (UnaryOperation)instruction.Argument));
                break;
            }

            case Opcode.Invoke:
            {
                IodineObject   target    = Pop();
                IodineObject[] arguments = new IodineObject[instruction.Argument];
                for (int i = 1; i <= instruction.Argument; i++)
                {
                    arguments [instruction.Argument - i] = Pop();
                }
                Push(target.Invoke(this, arguments));
                break;
            }

            case Opcode.InvokeVar:
            {
                IodineObject        target    = Pop();
                List <IodineObject> arguments = new List <IodineObject> ();
                IodineTuple         tuple     = Pop() as IodineTuple;
                if (tuple == null)
                {
                    RaiseException(new IodineTypeException("Tuple"));
                    break;
                }
                for (int i = 0; i < instruction.Argument; i++)
                {
                    arguments.Add(Pop());
                }
                arguments.AddRange(tuple.Objects);
                Push(target.Invoke(this, arguments.ToArray()));
                break;
            }

            case Opcode.InvokeSuper:
            {
                IodineTypeDefinition target    = Pop() as IodineTypeDefinition;
                IodineObject[]       arguments = new IodineObject[instruction.Argument];
                for (int i = 1; i <= instruction.Argument; i++)
                {
                    arguments [instruction.Argument - i] = Pop();
                }

                target.Inherit(this, Top.Self, arguments);
                break;
            }

            case Opcode.Return:
            {
                Top.InstructionPointer = int.MaxValue;
                break;
            }

            case Opcode.Yield:
            {
                Top.Yielded = true;
                break;
            }

            case Opcode.JumpIfTrue:
            {
                if (Pop().IsTrue())
                {
                    Top.InstructionPointer = instruction.Argument;
                }
                break;
            }

            case Opcode.JumpIfFalse:
            {
                if (!Pop().IsTrue())
                {
                    Top.InstructionPointer = instruction.Argument;
                }
                break;
            }

            case Opcode.Jump:
            {
                Top.InstructionPointer = instruction.Argument;
                break;
            }

            case Opcode.BuildClass:
            {
                IodineName   name        = Pop() as IodineName;
                IodineString doc         = Pop() as IodineString;
                IodineMethod constructor = Pop() as IodineMethod;
                //CodeObject initializer = Pop as CodeObject;
                IodineTypeDefinition baseClass  = Pop() as IodineTypeDefinition;
                IodineTuple          interfaces = Pop() as IodineTuple;
                IodineClass          clazz      = new IodineClass(name.ToString(), new CodeObject(), constructor);

                if (baseClass != null)
                {
                    clazz.BaseClass = baseClass;
                    baseClass.BindAttributes(clazz);
                }

                for (int i = 0; i < instruction.Argument; i++)
                {
                    IodineObject val = Pop();
                    IodineObject key = Pop();

                    clazz.Attributes [val.ToString()] = key;
                }

                foreach (IodineObject obj in interfaces.Objects)
                {
                    IodineContract contract = obj as IodineContract;
                    if (!contract.InstanceOf(clazz))
                    {
                        //RaiseException (new IodineTypeException (contract.Name));
                        break;
                    }
                }

                clazz.SetAttribute("__doc__", doc);

                Push(clazz);
                break;
            }

            case Opcode.BuildMixin:
            {
                IodineName name = Pop() as IodineName;

                IodineMixin mixin = new IodineMixin(name.ToString());

                for (int i = 0; i < instruction.Argument; i++)
                {
                    IodineObject val = Pop();
                    IodineObject key = Pop();

                    mixin.Attributes [val.ToString()] = key;
                }

                Push(mixin);
                break;
            }

            case Opcode.BuildEnum:
            {
                IodineName name = Pop() as IodineName;

                IodineEnum ienum = new IodineEnum(name.ToString());
                for (int i = 0; i < instruction.Argument; i++)
                {
                    IodineInteger val = Pop() as IodineInteger;
                    IodineName    key = Pop() as IodineName;
                    ienum.AddItem(key.ToString(), (int)val.Value);
                }

                Push(ienum);
                break;
            }

            case Opcode.BuildContract:
            {
                IodineName name = Pop() as IodineName;

                IodineContract contract = new IodineContract(name.ToString());
                for (int i = 0; i < instruction.Argument; i++)
                {
                    IodineMethod val = Pop() as IodineMethod;
                    contract.AddMethod(val);
                }

                Push(contract);
                break;
            }

            case Opcode.BuildTrait:
            {
                IodineName name = Pop() as IodineName;

                IodineTrait trait = new IodineTrait(name.ToString());
                for (int i = 0; i < instruction.Argument; i++)
                {
                    IodineMethod val = Pop() as IodineMethod;
                    trait.AddMethod(val);
                }

                Push(trait);
                break;
            }

            case Opcode.BuildHash:
            {
                IodineDictionary hash = new IodineDictionary();
                for (int i = 0; i < instruction.Argument; i++)
                {
                    IodineObject val = Pop();
                    IodineObject key = Pop();
                    hash.Set(key, val);
                }
                Push(hash);
                break;
            }

            case Opcode.BuildList:
            {
                IodineObject[] items = new IodineObject[instruction.Argument];
                for (int i = 1; i <= instruction.Argument; i++)
                {
                    items [instruction.Argument - i] = Pop();
                }
                Push(new IodineList(items));
                break;
            }

            case Opcode.BuildTuple:
            {
                IodineObject[] items = new IodineObject[instruction.Argument];
                for (int i = 1; i <= instruction.Argument; i++)
                {
                    items [instruction.Argument - i] = Pop();
                }
                Push(new IodineTuple(items));
                break;
            }

            case Opcode.BuildClosure:
            {
                IodineObject obj    = Pop();
                IodineMethod method = obj as IodineMethod;
                Push(new IodineClosure(Top, method));
                break;
            }

            case Opcode.BuildGenExpr:
            {
                CodeObject method = Pop() as CodeObject;
                Push(new IodineGeneratorExpr(Top, method));
                break;
            }

            case Opcode.Slice:
            {
                IodineObject target = Pop();

                IodineInteger[] arguments = new IodineInteger[3];

                for (int i = 0; i < 3; i++)
                {
                    IodineObject obj = Pop();
                    arguments [i] = obj as IodineInteger;

                    if (obj != IodineNull.Instance && arguments [i] == null)
                    {
                        RaiseException(new IodineTypeException("Int"));
                        break;
                    }
                }

                IodineSlice slice = new IodineSlice(arguments [0], arguments [1], arguments [2]);

                Push(target.Slice(this, slice));

                break;
            }

            case Opcode.MatchPattern:
            {
                IodineObject collection = Pop().GetIterator(this);

                IodineObject[] items = new IodineObject[instruction.Argument];
                for (int i = 1; i <= instruction.Argument; i++)
                {
                    items [instruction.Argument - i] = Pop();
                }


                int index = 0;

                collection.IterReset(this);

                while (collection.IterMoveNext(this) && index < items.Length)
                {
                    IodineObject o = collection.IterGetCurrent(this);

                    if (items [index] is IodineTypeDefinition)
                    {
                        if (!o.InstanceOf(items [index] as IodineTypeDefinition))
                        {
                            Push(IodineBool.False);
                            break;
                        }
                    }
                    else
                    {
                        if (!o.Equals(items [index]))
                        {
                            Push(IodineBool.False);
                            break;
                        }
                    }

                    index++;
                }

                Push(IodineBool.Create(index == items.Length));

                break;
            }

            case Opcode.Unwrap:
            {
                IodineObject container = Pop();

                IodineObject value = container.Unwrap(this);

                if (instruction.Argument > 0)
                {
                    IodineInteger len = value.Len(this) as IodineInteger;

                    if (len == null || len.Value != instruction.Argument)
                    {
                        Push(IodineBool.False);
                        break;
                    }
                }

                Push(value);
                Push(IodineBool.True);

                break;
            }

            case Opcode.Unpack:
            {
                IodineTuple tuple = Pop() as IodineTuple;

                if (tuple == null)
                {
                    RaiseException(new IodineTypeException("Tuple"));
                    break;
                }

                if (tuple.Objects.Length != instruction.Argument)
                {
                    RaiseException(new IodineUnpackException(instruction.Argument));
                    break;
                }
                for (int i = tuple.Objects.Length - 1; i >= 0; i--)
                {
                    Push(tuple.Objects [i]);
                }
                break;
            }

            case Opcode.GetIter:
            {
                Push(Pop().GetIterator(this));
                break;
            }

            case Opcode.IterGetNext:
            {
                Push(Pop().IterGetCurrent(this));
                break;
            }

            case Opcode.IterMoveNext:
            {
                Push(IodineBool.Create(Pop().IterMoveNext(this)));
                break;
            }

            case Opcode.IterReset:
            {
                Pop().IterReset(this);
                break;
            }

            case Opcode.PushExceptionHandler:
            {
                Top.ExceptionHandlers.Push(new IodineExceptionHandler(frameCount, instruction.Argument));
                break;
            }

            case Opcode.PopExceptionHandler:
            {
                Top.ExceptionHandlers.Pop();
                break;
            }

            case Opcode.InstanceOf:
            {
                IodineObject         o    = Pop();
                IodineTypeDefinition type = Pop() as IodineTypeDefinition;
                if (type == null)
                {
                    RaiseException(new IodineTypeException("TypeDef"));
                    break;
                }
                Push(IodineBool.Create(o.InstanceOf(type)));
                break;
            }

            case Opcode.DynamicCast:
            {
                IodineObject         o    = Pop();
                IodineTypeDefinition type = Pop() as IodineTypeDefinition;
                if (type == null)
                {
                    RaiseException(new IodineTypeException("TypeDef"));
                    break;
                }
                if (o.InstanceOf(type))
                {
                    Push(o);
                }
                else
                {
                    Push(IodineNull.Instance);
                }
                break;
            }

            case Opcode.NullCoalesce:
            {
                IodineObject o1 = Pop();
                IodineObject o2 = Pop();
                if (o1 is IodineNull)
                {
                    Push(o2);
                }
                else
                {
                    Push(o1);
                }
                break;
            }

            case Opcode.BeginExcept:
            {
                bool rethrow = true;
                for (int i = 1; i <= instruction.Argument; i++)
                {
                    IodineTypeDefinition type = Pop() as IodineTypeDefinition;
                    if (type == null)
                    {
                        RaiseException(new IodineTypeException("TypeDef"));
                        break;
                    }

                    if (lastException.InstanceOf(type))
                    {
                        rethrow = false;
                        break;
                    }
                }
                if (rethrow)
                {
                    RaiseException(lastException);
                }
                break;
            }

            case Opcode.Raise:
            {
                IodineObject e = Pop();
                if (e.InstanceOf(IodineException.TypeDefinition))
                {
                    RaiseException(e);
                }
                else
                {
                    RaiseException(new IodineTypeException("Exception"));
                }
                break;
            }

            case Opcode.SwitchLookup:
            {
                Dictionary <int, IodineObject> lookup = new Dictionary <int, IodineObject> ();
                int needle = Pop().GetHashCode();
                for (int i = 0; i < instruction.Argument; i++)
                {
                    IodineObject value = Pop();
                    IodineObject key   = Pop();
                    lookup [key.GetHashCode()] = value;
                }
                if (lookup.ContainsKey(needle))
                {
                    lookup [needle].Invoke(this, new IodineObject[] { });
                    Push(IodineBool.True);
                }
                else
                {
                    Push(IodineBool.False);
                }
                break;
            }

            case Opcode.BeginWith:
            {
                IodineObject obj = Pop();
                obj.Enter(this);
                Top.DisposableObjects.Push(obj);
                break;
            }

            case Opcode.EndWith:
            {
                Top.DisposableObjects.Pop().Exit(this);
                break;
            }

            case Opcode.IncludeMixin:
            {
                IodineObject obj  = Pop();
                IodineObject type = Pop();

                foreach (KeyValuePair <string, IodineObject> attr in obj.Attributes)
                {
                    type.SetAttribute(attr.Key, attr.Value);
                }
                break;
            }

            case Opcode.ApplyMixin:
            {
                IodineObject type  = Pop();
                IodineMixin  mixin = Top.Module.ConstantPool [instruction.Argument] as IodineMixin;

                foreach (KeyValuePair <string, IodineObject> attr in mixin.Attributes)
                {
                    type.SetAttribute(attr.Key, attr.Value);
                }
                break;
            }

            case Opcode.BuildFunction:
            {
                MethodFlags flags = (MethodFlags)instruction.Argument;

                IodineString name       = Pop() as IodineString;
                IodineString doc        = Pop() as IodineString;
                CodeObject   bytecode   = Pop() as CodeObject;
                IodineTuple  parameters = Pop() as IodineTuple;

                IodineObject[] defaultValues      = new IodineObject[] { };
                int            defaultValuesStart = 0;

                if (flags.HasFlag(MethodFlags.HasDefaultParameters))
                {
                    IodineTuple   defaultValuesTuple = Pop() as IodineTuple;
                    IodineInteger startInt           = Pop() as IodineInteger;
                    defaultValues      = defaultValuesTuple.Objects;
                    defaultValuesStart = (int)startInt.Value;
                }

                IodineMethod method = new IodineMethod(
                    Top.Module,
                    name,
                    bytecode,
                    parameters,
                    flags,
                    defaultValues,
                    defaultValuesStart
                    );

                method.SetAttribute("__doc__", doc);

                Push(method);

                break;
            }
            }
        }
Esempio n. 2
0
        private void ExecuteInstruction()
        {
            currentLocation = instruction.Location;
            switch (instruction.OperationCode)
            {
            case Opcode.Pop:
            {
                Pop();
                break;
            }

            case Opcode.Dup:
            {
                IodineObject val = Pop();
                Push(val);
                Push(val);
                break;
            }

            case Opcode.LoadConst:
            {
                Push(Top.Module.ConstantPool [instruction.Argument]);
                break;
            }

            case Opcode.LoadNull:
            {
                Push(IodineNull.Instance);
                break;
            }

            case Opcode.LoadSelf:
            {
                Push(Top.Self);
                break;
            }

            case Opcode.LoadTrue:
            {
                Push(IodineBool.True);
                break;
            }

            case Opcode.LoadException:
            {
                Push(lastException);
                break;
            }

            case Opcode.LoadFalse:
            {
                Push(IodineBool.False);
                break;
            }

            case Opcode.StoreLocal:
            {
                Top.StoreLocal(instruction.Argument, Pop());
                break;
            }

            case Opcode.LoadLocal:
            {
                Push(Top.LoadLocal(instruction.Argument));
                break;
            }

            case Opcode.StoreGlobal:
            {
                string name = ((IodineName)Top.Module.ConstantPool [instruction.Argument]).Value;
                if (Globals.ContainsKey(name))
                {
                    Globals [name] = Pop();
                }
                else
                {
                    Top.Module.SetAttribute(this, name, Pop());
                }
                break;
            }

            case Opcode.LoadGlobal:
            {
                string name = ((IodineName)Top.Module.ConstantPool [instruction.Argument]).Value;
                if (Top.Module.Attributes.ContainsKey(name))
                {
                    Push(Top.Module.GetAttribute(this, name));
                }
                else if (Globals.ContainsKey(name))
                {
                    Push(Globals [name]);
                }
                else
                {
                    RaiseException(new IodineAttributeNotFoundException(name));
                }
                break;
            }

            case Opcode.StoreAttribute:
            {
                IodineObject target    = Pop();
                IodineObject value     = Pop();
                string       attribute = ((IodineName)Top.Module.ConstantPool [instruction.Argument]).Value;
                if (target.Attributes.ContainsKey(attribute) &&
                    target.Attributes [attribute] is IIodineProperty)
                {
                    IIodineProperty property = (IIodineProperty)target.Attributes [attribute];
                    property.Set(this, value);
                    break;
                }
                target.SetAttribute(this, attribute, value);
                break;
            }

            case Opcode.LoadAttribute:
            {
                IodineObject target    = Pop();
                string       attribute = ((IodineName)Top.Module.ConstantPool [instruction.Argument]).Value;
                if (target.Attributes.ContainsKey(attribute) &&
                    target.Attributes [attribute] is IIodineProperty)
                {
                    IIodineProperty property = (IIodineProperty)target.Attributes [attribute];
                    Push(property.Get(this));
                    break;
                }
                Push(target.GetAttribute(this, attribute));
                break;
            }

            case Opcode.StoreIndex:
            {
                IodineObject index  = Pop();
                IodineObject target = Pop();
                IodineObject value  = Pop();
                target.SetIndex(this, index, value);
                break;
            }

            case Opcode.LoadIndex:
            {
                IodineObject index  = Pop();
                IodineObject target = Pop();
                Push(target.GetIndex(this, index));
                break;
            }

            case Opcode.BinOp:
            {
                IodineObject op2 = Pop();
                IodineObject op1 = Pop();
                Push(op1.PerformBinaryOperation(this,
                                                (BinaryOperation)instruction.Argument,
                                                op2));
                break;
            }

            case Opcode.UnaryOp:
            {
                Push(Pop().PerformUnaryOperation(this,
                                                 (UnaryOperation)instruction.Argument));
                break;
            }

            case Opcode.Invoke:
            {
                IodineObject   target    = Pop();
                IodineObject[] arguments = new IodineObject[instruction.Argument];
                for (int i = 1; i <= instruction.Argument; i++)
                {
                    arguments [instruction.Argument - i] = Pop();
                }
                Push(target.Invoke(this, arguments));
                break;
            }

            case Opcode.InvokeVar:
            {
                IodineObject        target    = Pop();
                List <IodineObject> arguments = new List <IodineObject> ();
                IodineTuple         tuple     = Pop() as IodineTuple;
                if (tuple == null)
                {
                    RaiseException(new IodineTypeException("Tuple"));
                    break;
                }
                for (int i = 0; i < instruction.Argument; i++)
                {
                    arguments.Add(Pop());
                }
                arguments.AddRange(tuple.Objects);
                Push(target.Invoke(this, arguments.ToArray()));
                break;
            }

            case Opcode.InvokeSuper:
            {
                IodineTypeDefinition target    = (IodineTypeDefinition)Pop();
                IodineObject[]       arguments = new IodineObject[instruction.Argument];
                for (int i = 1; i <= instruction.Argument; i++)
                {
                    arguments [instruction.Argument - i] = Pop();
                }
                target.Inherit(this, Top.Self, arguments);
                break;
            }

            case Opcode.Return:
            {
                Top.InstructionPointer = int.MaxValue;
                break;
            }

            case Opcode.Yield:
            {
                Top.Yielded = true;
                break;
            }

            case Opcode.JumpIfTrue:
            {
                if (Pop().IsTrue())
                {
                    Top.InstructionPointer = instruction.Argument;
                }
                break;
            }

            case Opcode.JumpIfFalse:
            {
                if (!Pop().IsTrue())
                {
                    Top.InstructionPointer = instruction.Argument;
                }
                break;
            }

            case Opcode.Jump:
            {
                Top.InstructionPointer = instruction.Argument;
                break;
            }

            case Opcode.BuildHash:
            {
                IodineHashMap hash = new IodineHashMap();
                for (int i = 0; i < instruction.Argument; i++)
                {
                    IodineObject val = Pop();
                    IodineObject key = Pop();
                    hash.Set(key, val);
                }
                Push(hash);
                break;
            }

            case Opcode.BuildList:
            {
                IodineObject[] items = new IodineObject[instruction.Argument];
                for (int i = 1; i <= instruction.Argument; i++)
                {
                    items [instruction.Argument - i] = Pop();
                }
                Push(new IodineList(items));
                break;
            }

            case Opcode.BuildTuple:
            {
                IodineObject[] items = new IodineObject[instruction.Argument];
                for (int i = 1; i <= instruction.Argument; i++)
                {
                    items [instruction.Argument - i] = Pop();
                }
                Push(new IodineTuple(items));
                break;
            }

            case Opcode.BuildClosure:
            {
                IodineMethod method = Pop() as IodineMethod;
                Push(new IodineClosure(Top, method));
                break;
            }

            case Opcode.IterGetNext:
            {
                Push(Pop().IterGetCurrent(this));
                break;
            }

            case Opcode.IterMoveNext:
            {
                Push(IodineBool.Create(Pop().IterMoveNext(this)));
                break;
            }

            case Opcode.IterReset:
            {
                Pop().IterReset(this);
                break;
            }

            case Opcode.PushExceptionHandler:
            {
                Top.ExceptionHandlers.Push(new IodineExceptionHandler(frameCount, instruction.Argument));
                break;
            }

            case Opcode.PopExceptionHandler:
            {
                Top.ExceptionHandlers.Pop();
                break;
            }

            case Opcode.InstanceOf:
            {
                IodineObject         o    = Pop();
                IodineTypeDefinition type = Pop() as IodineTypeDefinition;
                if (type == null)
                {
                    RaiseException(new IodineTypeException("TypeDef"));
                    break;
                }
                Push(IodineBool.Create(o.InstanceOf(type)));
                break;
            }

            case Opcode.DynamicCast:
            {
                IodineObject         o    = Pop();
                IodineTypeDefinition type = Pop() as IodineTypeDefinition;
                if (type == null)
                {
                    RaiseException(new IodineTypeException("TypeDef"));
                    break;
                }
                if (o.InstanceOf(type))
                {
                    Push(o);
                }
                else
                {
                    Push(IodineNull.Instance);
                }
                break;
            }

            case Opcode.NullCoalesce:
            {
                IodineObject o1 = Pop();
                IodineObject o2 = Pop();
                if (o1 is IodineNull)
                {
                    Push(o2);
                }
                else
                {
                    Push(o1);
                }
                break;
            }

            case Opcode.BeginExcept:
            {
                bool rethrow = true;
                for (int i = 1; i <= instruction.Argument; i++)
                {
                    IodineTypeDefinition type = Pop() as IodineTypeDefinition;
                    if (type == null)
                    {
                        RaiseException(new IodineTypeException("TypeDef"));
                        break;
                    }

                    if (lastException.InstanceOf(type))
                    {
                        rethrow = false;
                        break;
                    }
                }
                if (rethrow)
                {
                    RaiseException(lastException);
                }
                break;
            }

            case Opcode.Raise:
            {
                IodineObject e = Pop();
                if (e.InstanceOf(IodineException.TypeDefinition))
                {
                    RaiseException(e);
                }
                else
                {
                    RaiseException(new IodineTypeException("Exception"));
                }
                break;
            }

            case Opcode.SwitchLookup:
            {
                Dictionary <int, IodineObject> lookup = new Dictionary <int, IodineObject> ();
                int needle = Pop().GetHashCode();
                for (int i = 0; i < instruction.Argument; i++)
                {
                    IodineObject value = Pop();
                    IodineObject key   = Pop();
                    lookup [key.GetHashCode()] = value;
                }
                if (lookup.ContainsKey(needle))
                {
                    lookup [needle].Invoke(this, new IodineObject[] { });
                    Push(IodineBool.True);
                }
                else
                {
                    Push(IodineBool.False);
                }
                break;
            }

            case Opcode.BeginWith:
            {
                IodineObject obj = Pop();
                obj.Enter(this);
                Top.DisposableObjects.Push(obj);
                break;
            }

            case Opcode.EndWith:
            {
                Top.DisposableObjects.Pop().Exit(this);
                break;
            }
            }
        }