Update upb for ruby
diff --git a/conformance/failure_list_ruby.txt b/conformance/failure_list_ruby.txt
index 9b5ba7f..651cb55 100644
--- a/conformance/failure_list_ruby.txt
+++ b/conformance/failure_list_ruby.txt
@@ -65,4 +65,3 @@
 Required.Proto3.JsonInput.IgnoreUnknownJsonObject.ProtobufOutput
 Required.Proto3.JsonInput.IgnoreUnknownJsonString.ProtobufOutput
 Required.Proto3.JsonInput.IgnoreUnknownJsonTrue.ProtobufOutput
-Required.Proto3.JsonInput.EmptyFieldMask.JsonOutput
diff --git a/conformance/failure_list_ruby_mac.txt b/conformance/failure_list_ruby_mac.txt
index 86a5da1..3114cba 100644
--- a/conformance/failure_list_ruby_mac.txt
+++ b/conformance/failure_list_ruby_mac.txt
@@ -70,4 +70,3 @@
 Required.Proto3.JsonInput.IgnoreUnknownJsonString.ProtobufOutput
 Required.Proto3.JsonInput.IgnoreUnknownJsonTrue.ProtobufOutput
 Recommended.Proto3.JsonInput.FieldMaskInvalidCharacter
-Required.Proto3.JsonInput.EmptyFieldMask.JsonOutput
diff --git a/ruby/ext/google/protobuf_c/upb.c b/ruby/ext/google/protobuf_c/upb.c
index fba3bf0..deaa232 100644
--- a/ruby/ext/google/protobuf_c/upb.c
+++ b/ruby/ext/google/protobuf_c/upb.c
@@ -12624,6 +12624,7 @@
 ** - handling of keys/escape-sequences/etc that span input buffers.
 */
 
+#include <ctype.h>
 #include <errno.h>
 #include <float.h>
 #include <math.h>
@@ -12820,6 +12821,19 @@
   bool is_unknown_field;
 } upb_jsonparser_frame;
 
+static void init_frame(upb_jsonparser_frame* frame) {
+  frame->m = NULL;
+  frame->f = NULL;
+  frame->name_table = NULL;
+  frame->is_repeated = false;
+  frame->is_map = false;
+  frame->is_mapentry = false;
+  frame->mapfield = NULL;
+  frame->is_any = false;
+  frame->any_frame = NULL;
+  frame->is_unknown_field = false;
+}
+
 struct upb_json_parser {
   upb_env *env;
   const upb_json_parsermethod *method;
@@ -12867,6 +12881,13 @@
   struct tm tm;
 };
 
+static upb_jsonparser_frame* start_jsonparser_frame(upb_json_parser *p) {
+  upb_jsonparser_frame *inner;
+  inner = p->top + 1;
+  init_frame(inner);
+  return inner;
+}
+
 struct upb_json_parsermethod {
   upb_refcounted base;
 
@@ -13824,18 +13845,11 @@
 
     /* Start a new parser frame: parser frames correspond one-to-one with
      * handler frames, and string events occur in a sub-frame. */
-    inner = p->top + 1;
+    inner = start_jsonparser_frame(p);
     sel = getsel_for_handlertype(p, UPB_HANDLER_STARTSTR);
     upb_sink_startstr(&p->top->sink, sel, 0, &inner->sink);
     inner->m = p->top->m;
     inner->f = p->top->f;
-    inner->name_table = NULL;
-    inner->is_repeated = false;
-    inner->is_map = false;
-    inner->is_mapentry = false;
-    inner->is_any = false;
-    inner->any_frame = NULL;
-    inner->is_unknown_field = false;
     p->top = inner;
 
     if (upb_fielddef_type(p->top->f) == UPB_TYPE_STRING) {
@@ -14288,7 +14302,7 @@
 static bool end_timestamp_zone(upb_json_parser *p, const char *ptr) {
   size_t len;
   const char *buf;
-  int hours = 0;
+  int hours;
   int64_t seconds;
   const char *seconds_membername = "seconds";
 
@@ -14308,11 +14322,12 @@
     if (buf[0] == '+') {
       hours = -hours;
     }
+
+    p->tm.tm_hour += hours;
   }
 
   /* Normalize tm */
-  seconds = mktime(&p->tm) - timezone;
-  seconds += 3600 * hours;
+  seconds = mktime(&p->tm);
 
   /* Check timestamp boundary */
   if (seconds < -62135596800) {
@@ -14358,18 +14373,11 @@
 
   /* Start a new parser frame: parser frames correspond one-to-one with
    * handler frames, and string events occur in a sub-frame. */
-  inner = p->top + 1;
+  inner = start_jsonparser_frame(p);
   sel = getsel_for_handlertype(p, UPB_HANDLER_STARTSTR);
   upb_sink_startstr(&p->top->sink, sel, 0, &inner->sink);
   inner->m = p->top->m;
   inner->f = p->top->f;
-  inner->name_table = NULL;
-  inner->is_repeated = false;
-  inner->is_map = false;
-  inner->is_mapentry = false;
-  inner->is_any = false;
-  inner->any_frame = NULL;
-  inner->is_unknown_field = false;
   p->top = inner;
 
   multipart_startaccum(p);
@@ -14505,18 +14513,12 @@
   mapfield = p->top->mapfield;
   mapentrymsg = upb_fielddef_msgsubdef(mapfield);
 
-  inner = p->top + 1;
+  inner = start_jsonparser_frame(p);
   p->top->f = mapfield;
   sel = getsel_for_handlertype(p, UPB_HANDLER_STARTSUBMSG);
   upb_sink_startsubmsg(&p->top->sink, sel, &inner->sink);
   inner->m = mapentrymsg;
-  inner->name_table = NULL;
   inner->mapfield = mapfield;
-  inner->is_repeated = false;
-  inner->is_map = false;
-  inner->is_any = false;
-  inner->any_frame = NULL;
-  inner->is_unknown_field = false;
 
   /* Don't set this to true *yet* -- we reuse parsing handlers below to push
    * the key field value to the sink, and these handlers will pop the frame
@@ -14634,16 +14636,7 @@
     upb_jsonparser_frame *inner;
     if (!check_stack(p)) return false;
 
-    inner = p->top + 1;
-    inner->m = NULL;
-    inner->f = NULL;
-    inner->is_repeated = false;
-    inner->is_map = false;
-    inner->is_mapentry = false;
-    inner->is_any = false;
-    inner->any_frame = NULL;
-    inner->is_unknown_field = false;
-    p->top = inner;
+    p->top = start_jsonparser_frame(p);
     return true;
   }
 
@@ -14655,19 +14648,12 @@
      * context. */
     if (!check_stack(p)) return false;
 
-    inner = p->top + 1;
+    inner = start_jsonparser_frame(p);
     sel = getsel_for_handlertype(p, UPB_HANDLER_STARTSEQ);
     upb_sink_startseq(&p->top->sink, sel, &inner->sink);
     inner->m = upb_fielddef_msgsubdef(p->top->f);
-    inner->name_table = NULL;
     inner->mapfield = p->top->f;
-    inner->f = NULL;
-    inner->is_repeated = false;
     inner->is_map = true;
-    inner->is_mapentry = false;
-    inner->is_any = false;
-    inner->any_frame = NULL;
-    inner->is_unknown_field = false;
     p->top = inner;
 
     return true;
@@ -14679,17 +14665,11 @@
      * context. */
     if (!check_stack(p)) return false;
 
-    inner = p->top + 1;
-
+    inner = start_jsonparser_frame(p);
     sel = getsel_for_handlertype(p, UPB_HANDLER_STARTSUBMSG);
     upb_sink_startsubmsg(&p->top->sink, sel, &inner->sink);
     inner->m = upb_fielddef_msgsubdef(p->top->f);
     set_name_table(p, inner);
-    inner->f = NULL;
-    inner->is_repeated = false;
-    inner->is_map = false;
-    inner->is_mapentry = false;
-    inner->is_unknown_field = false;
     p->top = inner;
 
     if (is_wellknown_msg(p, UPB_WELLKNOWN_ANY)) {
@@ -14804,15 +14784,7 @@
   }
 
   if (p->top->is_unknown_field) {
-    inner = p->top + 1;
-    inner->m = NULL;
-    inner->name_table = NULL;
-    inner->f = NULL;
-    inner->is_repeated = false;
-    inner->is_map = false;
-    inner->is_mapentry = false;
-    inner->is_any = false;
-    inner->any_frame = NULL;
+    inner = start_jsonparser_frame(p);
     inner->is_unknown_field = true;
     p->top = inner;
 
@@ -14829,18 +14801,12 @@
 
   if (!check_stack(p)) return false;
 
-  inner = p->top + 1;
+  inner = start_jsonparser_frame(p);
   sel = getsel_for_handlertype(p, UPB_HANDLER_STARTSEQ);
   upb_sink_startseq(&p->top->sink, sel, &inner->sink);
   inner->m = p->top->m;
-  inner->name_table = NULL;
   inner->f = p->top->f;
   inner->is_repeated = true;
-  inner->is_map = false;
-  inner->is_mapentry = false;
-  inner->is_any = false;
-  inner->any_frame = NULL;
-  inner->is_unknown_field = false;
   p->top = inner;
 
   return true;
@@ -15219,11 +15185,11 @@
  * final state once, when the closing '"' is seen. */
 
 
-#line 2824 "upb/json/parser.rl"
+#line 2789 "upb/json/parser.rl"
 
 
 
-#line 2627 "upb/json/parser.c"
+#line 2592 "upb/json/parser.c"
 static const char _json_actions[] = {
 	0, 1, 0, 1, 1, 1, 3, 1, 
 	4, 1, 6, 1, 7, 1, 8, 1, 
@@ -15478,7 +15444,7 @@
 static const int json_en_main = 1;
 
 
-#line 2827 "upb/json/parser.rl"
+#line 2792 "upb/json/parser.rl"
 
 size_t parse(void *closure, const void *hd, const char *buf, size_t size,
              const upb_bufhandle *handle) {
@@ -15501,7 +15467,7 @@
   capture_resume(parser, buf);
 
   
-#line 2905 "upb/json/parser.c"
+#line 2870 "upb/json/parser.c"
 	{
 	int _klen;
 	unsigned int _trans;
@@ -15576,147 +15542,147 @@
 		switch ( *_acts++ )
 		{
 	case 1:
-#line 2632 "upb/json/parser.rl"
+#line 2597 "upb/json/parser.rl"
 	{ p--; {cs = stack[--top]; goto _again;} }
 	break;
 	case 2:
-#line 2634 "upb/json/parser.rl"
+#line 2599 "upb/json/parser.rl"
 	{ p--; {stack[top++] = cs; cs = 23;goto _again;} }
 	break;
 	case 3:
-#line 2638 "upb/json/parser.rl"
+#line 2603 "upb/json/parser.rl"
 	{ start_text(parser, p); }
 	break;
 	case 4:
-#line 2639 "upb/json/parser.rl"
+#line 2604 "upb/json/parser.rl"
 	{ CHECK_RETURN_TOP(end_text(parser, p)); }
 	break;
 	case 5:
-#line 2645 "upb/json/parser.rl"
+#line 2610 "upb/json/parser.rl"
 	{ start_hex(parser); }
 	break;
 	case 6:
-#line 2646 "upb/json/parser.rl"
+#line 2611 "upb/json/parser.rl"
 	{ hexdigit(parser, p); }
 	break;
 	case 7:
-#line 2647 "upb/json/parser.rl"
+#line 2612 "upb/json/parser.rl"
 	{ CHECK_RETURN_TOP(end_hex(parser)); }
 	break;
 	case 8:
-#line 2653 "upb/json/parser.rl"
+#line 2618 "upb/json/parser.rl"
 	{ CHECK_RETURN_TOP(escape(parser, p)); }
 	break;
 	case 9:
-#line 2659 "upb/json/parser.rl"
+#line 2624 "upb/json/parser.rl"
 	{ p--; {cs = stack[--top]; goto _again;} }
 	break;
 	case 10:
-#line 2664 "upb/json/parser.rl"
+#line 2629 "upb/json/parser.rl"
 	{ start_year(parser, p); }
 	break;
 	case 11:
-#line 2665 "upb/json/parser.rl"
+#line 2630 "upb/json/parser.rl"
 	{ CHECK_RETURN_TOP(end_year(parser, p)); }
 	break;
 	case 12:
-#line 2669 "upb/json/parser.rl"
+#line 2634 "upb/json/parser.rl"
 	{ start_month(parser, p); }
 	break;
 	case 13:
-#line 2670 "upb/json/parser.rl"
+#line 2635 "upb/json/parser.rl"
 	{ CHECK_RETURN_TOP(end_month(parser, p)); }
 	break;
 	case 14:
-#line 2674 "upb/json/parser.rl"
+#line 2639 "upb/json/parser.rl"
 	{ start_day(parser, p); }
 	break;
 	case 15:
-#line 2675 "upb/json/parser.rl"
+#line 2640 "upb/json/parser.rl"
 	{ CHECK_RETURN_TOP(end_day(parser, p)); }
 	break;
 	case 16:
-#line 2679 "upb/json/parser.rl"
+#line 2644 "upb/json/parser.rl"
 	{ start_hour(parser, p); }
 	break;
 	case 17:
-#line 2680 "upb/json/parser.rl"
+#line 2645 "upb/json/parser.rl"
 	{ CHECK_RETURN_TOP(end_hour(parser, p)); }
 	break;
 	case 18:
-#line 2684 "upb/json/parser.rl"
+#line 2649 "upb/json/parser.rl"
 	{ start_minute(parser, p); }
 	break;
 	case 19:
-#line 2685 "upb/json/parser.rl"
+#line 2650 "upb/json/parser.rl"
 	{ CHECK_RETURN_TOP(end_minute(parser, p)); }
 	break;
 	case 20:
-#line 2689 "upb/json/parser.rl"
+#line 2654 "upb/json/parser.rl"
 	{ start_second(parser, p); }
 	break;
 	case 21:
-#line 2690 "upb/json/parser.rl"
+#line 2655 "upb/json/parser.rl"
 	{ CHECK_RETURN_TOP(end_second(parser, p)); }
 	break;
 	case 22:
-#line 2695 "upb/json/parser.rl"
+#line 2660 "upb/json/parser.rl"
 	{ start_duration_base(parser, p); }
 	break;
 	case 23:
-#line 2696 "upb/json/parser.rl"
+#line 2661 "upb/json/parser.rl"
 	{ CHECK_RETURN_TOP(end_duration_base(parser, p)); }
 	break;
 	case 24:
-#line 2698 "upb/json/parser.rl"
+#line 2663 "upb/json/parser.rl"
 	{ p--; {cs = stack[--top]; goto _again;} }
 	break;
 	case 25:
-#line 2703 "upb/json/parser.rl"
+#line 2668 "upb/json/parser.rl"
 	{ start_timestamp_base(parser); }
 	break;
 	case 26:
-#line 2705 "upb/json/parser.rl"
+#line 2670 "upb/json/parser.rl"
 	{ start_timestamp_fraction(parser, p); }
 	break;
 	case 27:
-#line 2706 "upb/json/parser.rl"
+#line 2671 "upb/json/parser.rl"
 	{ CHECK_RETURN_TOP(end_timestamp_fraction(parser, p)); }
 	break;
 	case 28:
-#line 2708 "upb/json/parser.rl"
+#line 2673 "upb/json/parser.rl"
 	{ start_timestamp_zone(parser, p); }
 	break;
 	case 29:
-#line 2709 "upb/json/parser.rl"
+#line 2674 "upb/json/parser.rl"
 	{ CHECK_RETURN_TOP(end_timestamp_zone(parser, p)); }
 	break;
 	case 30:
-#line 2711 "upb/json/parser.rl"
+#line 2676 "upb/json/parser.rl"
 	{ p--; {cs = stack[--top]; goto _again;} }
 	break;
 	case 31:
-#line 2716 "upb/json/parser.rl"
+#line 2681 "upb/json/parser.rl"
 	{ start_fieldmask_path_text(parser, p); }
 	break;
 	case 32:
-#line 2717 "upb/json/parser.rl"
+#line 2682 "upb/json/parser.rl"
 	{ end_fieldmask_path_text(parser, p); }
 	break;
 	case 33:
-#line 2722 "upb/json/parser.rl"
+#line 2687 "upb/json/parser.rl"
 	{ start_fieldmask_path(parser); }
 	break;
 	case 34:
-#line 2723 "upb/json/parser.rl"
+#line 2688 "upb/json/parser.rl"
 	{ end_fieldmask_path(parser); }
 	break;
 	case 35:
-#line 2729 "upb/json/parser.rl"
+#line 2694 "upb/json/parser.rl"
 	{ p--; {cs = stack[--top]; goto _again;} }
 	break;
 	case 36:
-#line 2734 "upb/json/parser.rl"
+#line 2699 "upb/json/parser.rl"
 	{
         if (is_wellknown_msg(parser, UPB_WELLKNOWN_TIMESTAMP)) {
           {stack[top++] = cs; cs = 47;goto _again;}
@@ -15730,11 +15696,11 @@
       }
 	break;
 	case 37:
-#line 2747 "upb/json/parser.rl"
+#line 2712 "upb/json/parser.rl"
 	{ p--; {stack[top++] = cs; cs = 78;goto _again;} }
 	break;
 	case 38:
-#line 2752 "upb/json/parser.rl"
+#line 2717 "upb/json/parser.rl"
 	{
         if (is_wellknown_msg(parser, UPB_WELLKNOWN_ANY)) {
           start_any_member(parser, p);
@@ -15744,11 +15710,11 @@
       }
 	break;
 	case 39:
-#line 2759 "upb/json/parser.rl"
+#line 2724 "upb/json/parser.rl"
 	{ CHECK_RETURN_TOP(end_membername(parser)); }
 	break;
 	case 40:
-#line 2762 "upb/json/parser.rl"
+#line 2727 "upb/json/parser.rl"
 	{
         if (is_wellknown_msg(parser, UPB_WELLKNOWN_ANY)) {
           end_any_member(parser, p);
@@ -15758,7 +15724,7 @@
       }
 	break;
 	case 41:
-#line 2773 "upb/json/parser.rl"
+#line 2738 "upb/json/parser.rl"
 	{
         if (is_wellknown_msg(parser, UPB_WELLKNOWN_ANY)) {
           start_any_object(parser, p);
@@ -15768,7 +15734,7 @@
       }
 	break;
 	case 42:
-#line 2782 "upb/json/parser.rl"
+#line 2747 "upb/json/parser.rl"
 	{
         if (is_wellknown_msg(parser, UPB_WELLKNOWN_ANY)) {
           CHECK_RETURN_TOP(end_any_object(parser, p));
@@ -15778,54 +15744,54 @@
       }
 	break;
 	case 43:
-#line 2794 "upb/json/parser.rl"
+#line 2759 "upb/json/parser.rl"
 	{ CHECK_RETURN_TOP(start_array(parser)); }
 	break;
 	case 44:
-#line 2798 "upb/json/parser.rl"
+#line 2763 "upb/json/parser.rl"
 	{ end_array(parser); }
 	break;
 	case 45:
-#line 2803 "upb/json/parser.rl"
+#line 2768 "upb/json/parser.rl"
 	{ CHECK_RETURN_TOP(start_number(parser, p)); }
 	break;
 	case 46:
-#line 2804 "upb/json/parser.rl"
+#line 2769 "upb/json/parser.rl"
 	{ CHECK_RETURN_TOP(end_number(parser, p)); }
 	break;
 	case 47:
-#line 2806 "upb/json/parser.rl"
+#line 2771 "upb/json/parser.rl"
 	{ CHECK_RETURN_TOP(start_stringval(parser)); }
 	break;
 	case 48:
-#line 2807 "upb/json/parser.rl"
+#line 2772 "upb/json/parser.rl"
 	{ CHECK_RETURN_TOP(end_stringval(parser)); }
 	break;
 	case 49:
-#line 2809 "upb/json/parser.rl"
+#line 2774 "upb/json/parser.rl"
 	{ CHECK_RETURN_TOP(end_bool(parser, true)); }
 	break;
 	case 50:
-#line 2811 "upb/json/parser.rl"
+#line 2776 "upb/json/parser.rl"
 	{ CHECK_RETURN_TOP(end_bool(parser, false)); }
 	break;
 	case 51:
-#line 2813 "upb/json/parser.rl"
+#line 2778 "upb/json/parser.rl"
 	{ CHECK_RETURN_TOP(end_null(parser)); }
 	break;
 	case 52:
-#line 2815 "upb/json/parser.rl"
+#line 2780 "upb/json/parser.rl"
 	{ CHECK_RETURN_TOP(start_subobject_full(parser)); }
 	break;
 	case 53:
-#line 2816 "upb/json/parser.rl"
+#line 2781 "upb/json/parser.rl"
 	{ end_subobject_full(parser); }
 	break;
 	case 54:
-#line 2821 "upb/json/parser.rl"
+#line 2786 "upb/json/parser.rl"
 	{ p--; {cs = stack[--top]; goto _again;} }
 	break;
-#line 3229 "upb/json/parser.c"
+#line 3194 "upb/json/parser.c"
 		}
 	}
 
@@ -15842,32 +15808,32 @@
 	while ( __nacts-- > 0 ) {
 		switch ( *__acts++ ) {
 	case 0:
-#line 2630 "upb/json/parser.rl"
+#line 2595 "upb/json/parser.rl"
 	{ p--; {cs = stack[--top]; 	if ( p == pe )
 		goto _test_eof;
 goto _again;} }
 	break;
 	case 46:
-#line 2804 "upb/json/parser.rl"
+#line 2769 "upb/json/parser.rl"
 	{ CHECK_RETURN_TOP(end_number(parser, p)); }
 	break;
 	case 49:
-#line 2809 "upb/json/parser.rl"
+#line 2774 "upb/json/parser.rl"
 	{ CHECK_RETURN_TOP(end_bool(parser, true)); }
 	break;
 	case 50:
-#line 2811 "upb/json/parser.rl"
+#line 2776 "upb/json/parser.rl"
 	{ CHECK_RETURN_TOP(end_bool(parser, false)); }
 	break;
 	case 51:
-#line 2813 "upb/json/parser.rl"
+#line 2778 "upb/json/parser.rl"
 	{ CHECK_RETURN_TOP(end_null(parser)); }
 	break;
 	case 53:
-#line 2816 "upb/json/parser.rl"
+#line 2781 "upb/json/parser.rl"
 	{ end_subobject_full(parser); }
 	break;
-#line 3271 "upb/json/parser.c"
+#line 3236 "upb/json/parser.c"
 		}
 	}
 	}
@@ -15875,7 +15841,7 @@
 	_out: {}
 	}
 
-#line 2849 "upb/json/parser.rl"
+#line 2814 "upb/json/parser.rl"
 
   if (p != pe) {
     upb_status_seterrf(&parser->status, "Parse error at '%.*s'\n", pe - p, p);
@@ -15915,23 +15881,17 @@
   int top;
 
   p->top = p->stack;
-  p->top->f = NULL;
-  p->top->is_repeated = false;
-  p->top->is_map = false;
-  p->top->is_mapentry = false;
-  p->top->is_any = false;
-  p->top->any_frame = NULL;
-  p->top->is_unknown_field = false;
+  init_frame(p->top);
 
   /* Emit Ragel initialization of the parser. */
   
-#line 3329 "upb/json/parser.c"
+#line 3288 "upb/json/parser.c"
 	{
 	cs = json_start;
 	top = 0;
 	}
 
-#line 2898 "upb/json/parser.rl"
+#line 2857 "upb/json/parser.rl"
   p->current_state = cs;
   p->parser_top = top;
   accumulate_clear(p);
diff --git a/ruby/ext/google/protobuf_c/upb.h b/ruby/ext/google/protobuf_c/upb.h
index fbc56db..bb6a903 100644
--- a/ruby/ext/google/protobuf_c/upb.h
+++ b/ruby/ext/google/protobuf_c/upb.h
@@ -10639,4 +10639,3 @@
 #undef UPB_FIELD_AT
 #undef UPB_READ_ONEOF
 #undef UPB_WRITE_ONEOF
-#undef UPB_WRITE_ONEOF