More completely fixed the 0-key thing.

Unfortunately this degrades hash table lookup performance by
about 8%, which affects the streaming benchmark for googlemessage1
by about 5%.  We could get this back at the cost of some memory,
but it would be nice to avoid that.

4 files changed, 2 insertions, 9 deletions

diff --git a/src/upb_def.c b/src/upb_def.c
index 879f1e8..7e962c8 100644
--- a/src/upb_def.c
+++ b/src/upb_def.c
@@ -476,12 +476,6 @@ static upb_flow_t upb_enumdef_EnumValueDescriptorProto_value(void *_b,
       break;
     case GOOGLE_PROTOBUF_ENUMVALUEDESCRIPTORPROTO_NUMBER_FIELDNUM:
       b->number = upb_value_getint32(val);
-      if (b->number == 0) {
-        upb_seterr(&b->status, UPB_ERROR,
-                   "Enums with a value of 0 are currently broken; see "
-                   "http://code.google.com/p/upb/issues/detail?id=1.");
-        return UPB_BREAK;
-      }
       b->saw_number = true;
       break;
     default:
diff --git a/src/upb_table.c b/src/upb_table.c
index 39b8f20..720cc62 100644
--- a/src/upb_table.c
+++ b/src/upb_table.c
@@ -129,7 +129,6 @@ static void intinsert(upb_inttable *t, upb_inttable_entry *e)
 
 void upb_inttable_insert(upb_inttable *t, upb_inttable_entry *e)
 {
-  assert(e->key != 0);
   if((double)(t->t.count + 1) / upb_inttable_size(t) > MAX_LOAD) {
     /* Need to resize.  New table of double the size, add old elements to it. */
     upb_inttable new_table;
diff --git a/src/upb_table.h b/src/upb_table.h
index 1918e20..e667f0d 100644
--- a/src/upb_table.h
+++ b/src/upb_table.h
@@ -100,12 +100,11 @@ INLINE uint32_t upb_inttable_bucket(upb_inttable *t, upb_inttable_key_t k) {
  * ability to optimize. */
 INLINE void *upb_inttable_fastlookup(upb_inttable *t, uint32_t key,
                                      uint32_t entry_size) {
-  assert(key != 0);
   uint32_t bucket = upb_inttable_bucket(t, key);
   upb_inttable_entry *e;
   do {
     e = (upb_inttable_entry*)UPB_INDEX(t->t.entries, bucket-1, entry_size);
-    if(e->key == key) return e;
+    if(e->key == key && e->has_entry) return e;
   } while((bucket = e->next) != UPB_END_OF_CHAIN);
   return NULL;  /* Not found. */
 }
diff --git a/src/upbc.c b/src/upbc.c
index a636301..62f5afd 100644
--- a/src/upbc.c
+++ b/src/upbc.c
@@ -231,6 +231,7 @@ int main(int argc, char *argv[])
   free(defs);
   upb_string_unref(descriptor);
   upb_symtab_unref(s);
+  upb_symtab_unref(s2);
   fclose(h_const_file);
 
   return 0;