first pass at DATA sections

operand/types.go

@@ -15,6 +15,10 @@ type Symbol struct {
 	Static bool
 }
 
+func NewStaticSymbol(name string) Symbol {
+	return Symbol{Name: name, Static: true}
+}
+
 func (s Symbol) String() string {
 	n := s.Name
 	if s.Static {
@@ -51,12 +55,27 @@ func NewStackAddr(offset int) Mem {
 	}
 }
 
-func (m Mem) Idx(idx int) Mem {
+func NewDataAddr(sym Symbol, offset int) Mem {
+	return Mem{
+		Symbol: sym,
+		Disp:   offset,
+		Base:   reg.StaticBase,
+	}
+}
+
+func (m Mem) Offset(idx int) Mem {
 	a := m
 	a.Disp += idx
 	return a
 }
 
+func (m Mem) Idx(r reg.Register, s uint8) Mem {
+	a := m
+	a.Index = r
+	a.Scale = s
+	return a
+}
+
 func (m Mem) Asm() string {
 	a := m.Symbol.String()
 	if m.Disp != 0 {

operand/types_test.go

@@ -42,6 +42,8 @@ func TestMemAsm(t *testing.T) {
 		{Mem{Symbol: Symbol{Name: "foo"}, Base: reg.StaticBase, Disp: -7}, "foo-7(SB)"},
 		{Mem{Symbol: Symbol{Name: "bar", Static: true}, Base: reg.StaticBase, Disp: 4, Index: reg.R11, Scale: 4}, "bar<>+4(SB)(R11*4)"},
 		{NewParamAddr("param", 16), "param+16(FP)"},
+		{NewStackAddr(42), "42(SP)"},
+		{NewDataAddr(Symbol{Name: "data", Static: true}, 13), "data<>+13(SB)"},
 	}
 	for _, c := range cases {
 		got := c.Mem.Asm()