More work on upb_context.

1 files changed, 16 insertions, 0 deletions

diff --git a/upb.h b/upb.h
index bb1563a..5197395 100644
--- a/upb.h
+++ b/upb.h
@@ -29,6 +29,9 @@ extern "C" {
 /* The maximum that any submessages can be nested.  Matches proto2's limit. */
 #define UPB_MAX_NESTING 64
 
+/* The maximum number of fields that any one .proto type can have. */
+#define UPB_MAX_FIELDS (1<<16)
+
 /* Represents a string or bytes. */
 struct upb_string {
   /* We expect the data to be 8-bit clean (uint8_t), but char* is such an
@@ -97,6 +100,19 @@ struct upb_tag {
   upb_wire_type_t wire_type;
 };
 
+enum upb_symbol_type {
+  UPB_SYM_MESSAGE,
+  UPB_SYM_ENUM,
+  UPB_SYM_SERVICE,
+  UPB_SYM_EXTENSION
+};
+
+union upb_symbol_ref {
+  struct upb_msg *msg;
+  struct upb_enum *_enum;
+  struct upb_svc *svc;
+};
+
 /* Status codes used as a return value. */
 typedef enum upb_status {
   UPB_STATUS_OK = 0,