ast: change file to have a list of sections

printer/goasm.go

@@ -22,8 +22,13 @@ func NewGoAsm(cfg Config) Printer {
 
 func (p *goasm) Print(f *avo.File) ([]byte, error) {
 	p.header()
-	for _, fn := range f.Functions {
-		p.function(fn)
+	for _, s := range f.Sections {
+		switch s := s.(type) {
+		case *avo.Function:
+			p.function(s)
+		default:
+			panic("unknown section type")
+		}
 	}
 	return p.Result()
 }

printer/stubs.go

@@ -18,7 +18,7 @@ func (s *stubs) Print(f *avo.File) ([]byte, error) {
 	s.Comment(s.cfg.GeneratedWarning())
 	s.NL()
 	s.Printf("package %s\n", s.cfg.Pkg)
-	for _, fn := range f.Functions {
+	for _, fn := range f.Functions() {
 		s.NL()
 		s.Printf("%s\n", fn.Stub())
 	}