Changed endsubmsg handler to return the closure of the submessage.

This is a behavior change to help out PHP for the lazy wrappers
optimization.

generated_for_cmake/upb/json/parser.c

@@ -2036,7 +2036,7 @@ static void end_member(upb_json_parser *p) {
     p->top--;
     ok = upb_handlers_getselector(mapfield, UPB_HANDLER_ENDSUBMSG, &sel);
     UPB_ASSERT(ok);
-    upb_sink_endsubmsg(p->top->sink, sel);
+    upb_sink_endsubmsg(p->top->sink, (p->top + 1)->sink, sel);
   }
 
   p->top->f = NULL;
@@ -2150,7 +2150,7 @@ static void end_subobject(upb_json_parser *p) {
     p->top--;
     if (!is_unknown) {
       sel = getsel_for_handlertype(p, UPB_HANDLER_ENDSUBMSG);
-      upb_sink_endsubmsg(p->top->sink, sel);
+      upb_sink_endsubmsg(p->top->sink, (p->top + 1)->sink, sel);
     }
   }
 }

tests/pb/test_decoder.cc

@@ -569,7 +569,7 @@ string wrap_text(int32_t fn, const string& text) {
       LINE("<"),
       num2string(fn), LINE(":{")
       "  ", wrapped_text,
-      LINE("}")
+      LINE("  }")
       LINE(">"));
   return wrapped_text;
 }
@@ -922,7 +922,7 @@ void test_valid() {
       LINE("%u:{")
       LINE("  <")
       LINE("  >")
-      LINE("}")
+      LINE("  }")
       LINE(">"), UPB_DESCRIPTOR_TYPE_MESSAGE);
 
   assert_successful_parse(
@@ -933,7 +933,7 @@ void test_valid() {
       LINE("%u:{")
       LINE("  <")
       LINE("  >")
-      LINE("}")
+      LINE("  }")
       LINE("%u:5")
       LINE(">"), UPB_DESCRIPTOR_TYPE_MESSAGE, UPB_DESCRIPTOR_TYPE_INT32);
 
@@ -957,9 +957,9 @@ void test_valid() {
       LINE("    <")
       LINE("    %u:2345678")
       LINE("    >")
-      LINE("  }")
+      LINE("    }")
       LINE("  >")
-      LINE("}")
+      LINE("  }")
       LINE("%u:22222")
       LINE(">"), msg_type, msg_type, int32_type, int32_type);
 
@@ -984,7 +984,7 @@ void test_valid() {
       LINE("  %u:(5)\"abcde")
       LINE("    %u:\"")
       LINE("  >")
-      LINE("}")
+      LINE("  }")
       LINE(">"), msg_fn, UPB_DESCRIPTOR_TYPE_STRING,
                  UPB_DESCRIPTOR_TYPE_STRING);
 
@@ -1014,11 +1014,11 @@ void test_valid() {
       LINE("    %u:{")
       LINE("      <")
       LINE("      >")
-      LINE("    }")
+      LINE("      }")
       LINE("    >")
-      LINE("  }")
+      LINE("    }")
       LINE("  >")
-      LINE("}")
+      LINE("  }")
       LINE(">"), msg_fn, msg_fn, msg_fn);
 
   uint32_t repm_fn = rep_fn(UPB_DESCRIPTOR_TYPE_MESSAGE);
@@ -1032,10 +1032,10 @@ void test_valid() {
       LINE("      %u:{")
       LINE("        <")
       LINE("        >")
-      LINE("      }")
+      LINE("        }")
       LINE("    ]")
       LINE("    >")
-      LINE("  }")
+      LINE("    }")
       LINE("]")
       LINE(">"), repm_fn, repm_fn, repm_fn, repm_fn);
 
@@ -1099,7 +1099,7 @@ void test_valid() {
   textbuf.append(">\n");
   for (int i = 0; i < total; i++) {
     indentbuf(&textbuf, total - i - 1);
-    textbuf.append("}\n");
+    textbuf.append("  }\n");
     indentbuf(&textbuf, total - i - 1);
     textbuf.append(">\n");
   }

upb/json/parser.rl

@@ -2034,7 +2034,7 @@ static void end_member(upb_json_parser *p) {
     p->top--;
     ok = upb_handlers_getselector(mapfield, UPB_HANDLER_ENDSUBMSG, &sel);
     UPB_ASSERT(ok);
-    upb_sink_endsubmsg(p->top->sink, sel);
+    upb_sink_endsubmsg(p->top->sink, (p->top + 1)->sink, sel);
   }
 
   p->top->f = NULL;
@@ -2148,7 +2148,7 @@ static void end_subobject(upb_json_parser *p) {
     p->top--;
     if (!is_unknown) {
       sel = getsel_for_handlertype(p, UPB_HANDLER_ENDSUBMSG);
-      upb_sink_endsubmsg(p->top->sink, sel);
+      upb_sink_endsubmsg(p->top->sink, (p->top + 1)->sink, sel);
     }
   }
 }

upb/pb/decoder.c

@@ -749,7 +749,8 @@ size_t run_decoder_vm(upb_pbdecoder *d, const mgroup *group,
         CHECK_SUSPEND(upb_sink_startsubmsg(outer->sink, arg, &d->top->sink));
       )
       VMCASE(OP_ENDSUBMSG,
-        CHECK_SUSPEND(upb_sink_endsubmsg(d->top->sink, arg));
+        upb_sink subsink = (d->top + 1)->sink;
+        CHECK_SUSPEND(upb_sink_endsubmsg(d->top->sink, subsink, arg));
       )
       VMCASE(OP_STARTSTR,
         uint32_t len = delim_remaining(d);

upb/sink.h

@@ -185,15 +185,16 @@ UPB_INLINE bool upb_sink_startsubmsg(upb_sink s, upb_selector_t sel,
   return sub->closure ? true : false;
 }
 
-UPB_INLINE bool upb_sink_endsubmsg(upb_sink s, upb_selector_t sel) {
+UPB_INLINE bool upb_sink_endsubmsg(upb_sink s, upb_sink sub,
+                                   upb_selector_t sel) {
   typedef upb_endfield_handlerfunc func;
   func *endsubmsg;
   const void *hd;
   if (!s.handlers) return true;
   endsubmsg = (func*)upb_handlers_gethandler(s.handlers, sel, &hd);
 
-  if (!endsubmsg) return s.closure;
+  if (!endsubmsg) return true;
-  return endsubmsg(s.closure, hd);
+  return endsubmsg(sub.closure, hd);
 }
 
 #ifdef __cplusplus
@@ -359,8 +360,8 @@ class upb::Sink {
     return ret;
   }
 
-  bool EndSubMessage(HandlersPtr::Selector s) {
+  bool EndSubMessage(HandlersPtr::Selector s, Sink sub) {
-    return upb_sink_endsubmsg(sink_, s);
+    return upb_sink_endsubmsg(sink_, sub.sink_, s);
   }
 
   /* For repeated fields of any type, the sequence of values must be wrapped in