Improved SSA and added unused value checks

src/ssa/BinaryOperation.go

@@ -0,0 +1,50 @@
+package ssa
+
+import (
+	"fmt"
+
+	"git.urbach.dev/cli/q/src/expression"
+	"git.urbach.dev/cli/q/src/token"
+)
+
+type BinaryOperation struct {
+	Left  Value
+	Right Value
+	Op    token.Kind
+	Liveness
+	HasToken
+}
+
+func (v *BinaryOperation) Dependencies() []Value {
+	return []Value{v.Left, v.Right}
+}
+
+func (a *BinaryOperation) Equals(v Value) bool {
+	b, sameType := v.(*BinaryOperation)
+
+	if !sameType {
+		return false
+	}
+
+	if a.Source.Kind != b.Source.Kind {
+		return false
+	}
+
+	if !a.Left.Equals(b.Left) {
+		return false
+	}
+
+	if !a.Right.Equals(b.Right) {
+		return false
+	}
+
+	return true
+}
+
+func (v *BinaryOperation) IsConst() bool {
+	return true
+}
+
+func (v *BinaryOperation) String() string {
+	return fmt.Sprintf("%s %s %s", v.Left, expression.Operators[v.Op].Symbol, v.Right)
+}