gotypes: saving progress (temporarily broken tests)

operand/types.go

@@ -31,6 +31,19 @@ type Mem struct {
 	Scale  uint8
 }
 
+// NewParamAddr is a convenience to build a Mem operand pointing to a function
+// parameter, which is a named offset from the frame pointer pseudo register.
+func NewParamAddr(name string, offset int) Mem {
+	return Mem{
+		Symbol: Symbol{
+			Name:   name,
+			Static: false,
+		},
+		Disp: offset,
+		Base: reg.FramePointer,
+	}
+}
+
 func (m Mem) Asm() string {
 	a := m.Symbol.String()
 	if m.Disp != 0 {

operand/types_test.go

@@ -41,6 +41,7 @@ func TestMemAsm(t *testing.T) {
 		{Mem{Symbol: Symbol{Name: "foo"}, Base: reg.StaticBase, Disp: 4}, "foo+4(SB)"},
 		{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)"},
 	}
 	for _, c := range cases {
 		got := c.Mem.Asm()