complete and total overhaul like i promised. things are much easier to reason about. still not working yet though.

nexgb/xgbgen/size.go

@@ -0,0 +1,22 @@
+package main
+
+type Size struct {
+	Expression
+}
+
+func newFixedSize(fixed uint) Size {
+	return Size{&Value{v: fixed}}
+}
+
+func newExpressionSize(variable Expression) Size {
+	return Size{variable}
+}
+
+func (s1 Size) Add(s2 Size) Size {
+	return Size{newBinaryOp("+", s1, s2)}
+}
+
+func (s1 Size) Multiply(s2 Size) Size {
+	return Size{newBinaryOp("*", s1, s2)}
+}
+