Simplified file structure

src/scope/Variable.go

@@ -0,0 +1,28 @@
+package scope
+
+import (
+	"git.akyoto.dev/cli/q/src/cpu"
+	"git.akyoto.dev/cli/q/src/types"
+)
+
+// Variable represents a named register.
+type Variable struct {
+	Name     string
+	Type     types.Type
+	Alive    uint8
+	Register cpu.Register
+}
+
+// IsAlive returns true if the variable is still alive.
+func (v *Variable) IsAlive() bool {
+	return v.Alive > 0
+}
+
+// Use reduces the lifetime counter by one.
+func (v *Variable) Use() {
+	if v.Alive == 0 {
+		panic("incorrect number of variable use calls")
+	}
+
+	v.Alive--
+}