pass: cfg tests

2018-12-02 13:50:55 -08:00
parent 43575d8b61
commit bc7d0fa410
3 changed files with 227 additions and 7 deletions
--- a/ast.go
+++ b/ast.go
@@ -47,6 +47,9 @@ func (i Instruction) TargetLabel() *Label {
 	if !i.IsBranch {
 		return nil
 	}
+	if len(i.Operands) == 0 {
+		return nil
+	}
 	if ref, ok := i.Operands[0].(operand.LabelRef); ok {
 		lbl := Label(ref)
 		return &lbl