start to implement operand types and checks

operand/types_test.go

@@ -0,0 +1,28 @@
+package operand
+
+import (
+	"testing"
+
+	"github.com/mmcloughlin/avo/reg"
+)
+
+func TestMemAsm(t *testing.T) {
+	cases := []struct {
+		Mem    Mem
+		Expect string
+	}{
+		{Mem{Base: reg.EAX}, "(AX)"},
+		{Mem{Disp: 16, Base: reg.RAX}, "16(AX)"},
+		{Mem{Base: reg.R11, Index: reg.RAX, Scale: 4}, "(R11)(AX*4)"},
+		{Mem{Base: reg.R11, Index: reg.RAX, Scale: 1}, "(R11)(AX*1)"},
+		{Mem{Base: reg.R11, Index: reg.RAX}, "(R11)"},
+		{Mem{Base: reg.R11, Scale: 8}, "(R11)"},
+		{Mem{Disp: 2048, Base: reg.R11, Index: reg.RAX, Scale: 8}, "2048(R11)(AX*8)"},
+	}
+	for _, c := range cases {
+		got := c.Mem.Asm()
+		if got != c.Expect {
+			t.Errorf("%#v.Asm() = %s expected %s", c.Mem, got, c.Expect)
+		}
+	}
+}