Bitshift

vm/vm.go

@@ -114,7 +114,8 @@ func (vm *VM) Run() error {
 			}
 
 		case code.OpAdd, code.OpSub, code.OpMul, code.OpDiv, code.OpMod, code.OpOr,
-			code.OpAnd, code.OpBitwiseOR, code.OpBitwiseXOR, code.OpBitwiseAND:
+			code.OpAnd, code.OpBitwiseOR, code.OpBitwiseXOR, code.OpBitwiseAND,
+			code.OpLeftShift, code.OpRightShift:
 			err := vm.executeBinaryOperation(op)
 			if err != nil {
 				return err
@@ -631,6 +632,10 @@ func (vm *VM) executeBinaryIntegerOperation(op code.Opcode, left, right object.O
 		result = leftValue ^ rightValue
 	case code.OpBitwiseAND:
 		result = leftValue & rightValue
+	case code.OpLeftShift:
+		result = leftValue << uint64(rightValue)
+	case code.OpRightShift:
+		result = leftValue >> uint64(rightValue)
 
 	default:
 		return fmt.Errorf("unknown integer operator: %d", op)

vm/vm_test.go

@@ -230,6 +230,8 @@ func TestIntegerArithmetic(t *testing.T) {
 		{"1 | 2", 3},
 		{"2 ^ 4", 6},
 		{"3 & 6", 2},
+		{"1 << 2", 4},
+		{"4 >> 2", 1},
 	}
 
 	runVmTests(t, tests)