Switched to pointer receivers for values

src/eval/Label.go

@@ -8,10 +8,10 @@ type Label struct {
 	Label string
 }
 
-func (v Label) String() string {
+func (v *Label) String() string {
 	return "Label"
 }
 
-func (v Label) Type() types.Type {
+func (v *Label) Type() types.Type {
 	return v.Typ
 }

src/eval/Memory.go

@@ -11,10 +11,10 @@ type Memory struct {
 	Memory asm.Memory
 }
 
-func (v Memory) String() string {
+func (v *Memory) String() string {
 	return "Memory"
 }
 
-func (v Memory) Type() types.Type {
+func (v *Memory) Type() types.Type {
 	return v.Typ
 }

src/eval/Number.go

@@ -8,10 +8,10 @@ type Number struct {
 	Number int
 }
 
-func (v Number) String() string {
+func (v *Number) String() string {
 	return "Number"
 }
 
-func (v Number) Type() types.Type {
+func (v *Number) Type() types.Type {
 	return v.Typ
 }

src/eval/Register.go

@@ -12,10 +12,24 @@ type Register struct {
 	Register cpu.Register
 }
 
-func (v Register) String() string {
+func (v *Register) String() string {
 	return "Register"
 }
 
-func (v Register) Type() types.Type {
+func (v *Register) Type() types.Type {
 	return v.Typ
 }
+
+// IsAlive returns true if the register value is still alive.
+func (v *Register) IsAlive() bool {
+	return v.Alive > 0
+}
+
+// Use reduces the lifetime counter by one.
+func (v *Register) Use() {
+	if v.Alive == 0 {
+		panic("incorrect number of value use calls")
+	}
+
+	v.Alive--
+}

src/eval/Value.go

@@ -9,17 +9,3 @@ type Value interface {
 	String() string
 	Type() types.Type
 }
-
-// IsAlive returns true if the register value is still alive.
-func (v *Register) IsAlive() bool {
-	return v.Alive > 0
-}
-
-// Use reduces the lifetime counter by one.
-func (v *Register) Use() {
-	if v.Alive == 0 {
-		panic("incorrect number of value use calls")
-	}
-
-	v.Alive--
-}