Added eval package

src/scope/Stack.go

@@ -3,6 +3,7 @@ package scope
 import (
 	"git.urbach.dev/cli/q/src/ast"
 	"git.urbach.dev/cli/q/src/cpu"
+	"git.urbach.dev/cli/q/src/eval"
 	"git.urbach.dev/cli/q/src/token"
 )
 
@@ -45,7 +46,8 @@ func (stack *Stack) PushScope(body ast.AST, buffer []byte) *Scope {
 
 			s.Variables = append(s.Variables, &Variable{
 				Name: v.Name,
-				Value: Value{
+				Value: eval.Value{
+					Kind:     eval.Register,
 					Register: v.Register,
 					Alive:    count,
 					Type:     v.Type,

src/scope/Value.go

@@ -1,27 +0,0 @@
-package scope
-
-import (
-	"git.urbach.dev/cli/q/src/cpu"
-	"git.urbach.dev/cli/q/src/types"
-)
-
-// Value combines a register with its data type.
-type Value struct {
-	Type     types.Type
-	Register cpu.Register
-	Alive    uint8
-}
-
-// IsAlive returns true if the Value is still alive.
-func (v *Value) IsAlive() bool {
-	return v.Alive > 0
-}
-
-// Use reduces the lifetime counter by one.
-func (v *Value) Use() {
-	if v.Alive == 0 {
-		panic("incorrect number of value use calls")
-	}
-
-	v.Alive--
-}

src/scope/Variable.go

@@ -1,7 +1,9 @@
 package scope
 
+import "git.urbach.dev/cli/q/src/eval"
+
 // Variable is a named value.
 type Variable struct {
-	Value
 	Name string
+	eval.Value
 }