From 402a0dc87e7d51812a18fa76feeb46d66efda175 Mon Sep 17 00:00:00 2001 From: Dmitry Vyukov Date: Sat, 6 Jan 2018 14:46:52 +0100 Subject: sys: support type aliases (aka typedefs) Complex types that are often repeated can be given short type aliases using the following syntax: ``` type identifier underlying_type ``` For example: ``` type signalno int32[0:65] type net_port proc[20000, 4, int16be] ``` Then, type alias can be used instead of the underlying type in any contexts. Underlying type needs to be described as if it's a struct field, that is, with the base type if it's required. However, type alias can be used as syscall arguments as well. Underlying types are currently restricted to integer types, `ptr`, `ptr64`, `const`, `flags` and `proc` types. --- pkg/ast/format.go | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'pkg/ast/format.go') diff --git a/pkg/ast/format.go b/pkg/ast/format.go index 0f95d7ebf..a77662df8 100644 --- a/pkg/ast/format.go +++ b/pkg/ast/format.go @@ -62,6 +62,10 @@ func (res *Resource) serialize(w io.Writer) { fmt.Fprintf(w, "\n") } +func (typedef *TypeDef) serialize(w io.Writer) { + fmt.Fprintf(w, "type %v %v\n", typedef.Name.Name, fmtType(typedef.Type)) +} + func (c *Call) serialize(w io.Writer) { fmt.Fprintf(w, "%v(", c.Name.Name) for i, a := range c.Args { -- cgit mrf-deployment