Change upb_src to use push-based interface.

Unfortunately my previous detailed commit message was
lost somehow by git or vi.  Will have to explain in more
detail at a later date the rationale for this change.
The build will be broken until I port the old decoder
to this new interface.

1 files changed, 4 insertions, 0 deletions

diff --git a/core/upb.h b/core/upb.h
index 7ee0469..6ecc2a0 100644
--- a/core/upb.h
+++ b/core/upb.h
@@ -261,6 +261,10 @@ enum upb_status_code {
   UPB_ERROR_MAX_NESTING_EXCEEDED = -3
 };
 
+// TODO: consider making this a single word: a upb_string* where we use the low
+// bits as flags indicating whether there is an error and whether it is
+// resumable.  This would improve efficiency, because the code would not need
+// to be loaded after a call to a function returning a status.
 typedef struct {
   enum upb_status_code code;
   upb_string *str;