tree ae718a5a7aa074c79546d7f063a24c8fe8bdf6ed
parent 1fa78d8a35d35dc48bcfe390a44d1c48f886f866
author Damien Neil <dneil@google.com> 1536964871 -0700
committer Damien Neil <dneil@google.com> 1537310993 +0000

cmd/protoc-gen-go: generate extensions

Generate everything related to extensions: extension descriptors,
XXX_InternalExtensions fields, etc.

Tweak the order in which we generate code for descriptors to ensure
consistent output with the previous protoc-gen-go.

Change Field.ContainingType to Field.ParentMessage, since we need to get
at the parent of both message fields and extensions (and the "containing
type" of an extension field is the extended message, under existing
terminology).

Change-Id: I5d045ca80536436e7c987bca3d8fb8c1e1521e55
Reviewed-on: https://go-review.googlesource.com/136155
Reviewed-by: Joe Tsai <thebrokentoaster@gmail.com>