Major refactoring of upb_msg. Temporary functionality regression.

There is significant refactoring here, as well as some more trivial
name changes.  upb_msg has become upb_msgdef, to reflect the fact
that a upb_msg is not *itself* a message, it describes a message.
There are other renamings, such as upb_parse_state -> upb_stream_parser.

More significantly, the upb_msg class and parser have been refactored
to reflect my recent realization about how memory management should
work.  upb_msg now has no memory management, and a memory mangement
scheme (that works beautifully with multiple language runtimes) will
be layered on top of it.

This iteration has the new, read-only upb_msg.  upb_mm_msg (a
memory-managed message class) will come in the next change.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/upb.h b/src/upb.h
index 0db5369..83917af 100644
--- a/src/upb.h
+++ b/src/upb.h
@@ -133,7 +133,7 @@ INLINE union upb_value upb_deref(union upb_value_ptr ptr, upb_field_type_t t) {
 }
 
 union upb_symbol_ref {
-  struct upb_msg *msg;
+  struct upb_msgdef *msg;
   struct upb_enum *_enum;
   struct upb_svc *svc;
 };