Sync to internal Google development.

2 files changed, 112 insertions, 90 deletions

diff --git a/upb/descriptor/descriptor.upb.c b/upb/descriptor/descriptor.upb.c
index f183285..8046bcd 100755
--- a/upb/descriptor/descriptor.upb.c
+++ b/upb/descriptor/descriptor.upb.c
@@ -39,79 +39,79 @@ const upb_msgdef google_protobuf_msgs[20] = {
 };
 
 const upb_fielddef google_protobuf_fields[73] = {
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, "aggregate_value", 8, &google_protobuf_msgs[18], NULL, 15, 6, {0},&reftables[40], &reftables[41]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_BOOL, 0, false, "cc_generic_services", 16, &google_protobuf_msgs[10], NULL, 14, 5, {0},&reftables[42], &reftables[43]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_ENUM, 0, false, "ctype", 1, &google_protobuf_msgs[7], UPB_UPCAST(&google_protobuf_enums[2]), 6, 1, {0},&reftables[44], &reftables[45]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, "default_value", 7, &google_protobuf_msgs[6], NULL, 16, 7, {0},&reftables[46], &reftables[47]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_STRING, 0, false, "dependency", 3, &google_protobuf_msgs[8], NULL, 30, 8, {0},&reftables[48], &reftables[49]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_BOOL, 0, false, "deprecated", 3, &google_protobuf_msgs[7], NULL, 8, 3, {0},&reftables[50], &reftables[51]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_DOUBLE, 0, false, "double_value", 6, &google_protobuf_msgs[18], NULL, 11, 4, {0},&reftables[52], &reftables[53]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_INT32, UPB_INTFMT_VARIABLE, false, "end", 2, &google_protobuf_msgs[1], NULL, 3, 1, {0},&reftables[54], &reftables[55]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, "enum_type", 4, &google_protobuf_msgs[0], UPB_UPCAST(&google_protobuf_msgs[2]), 16, 2, {0},&reftables[56], &reftables[57]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, "enum_type", 5, &google_protobuf_msgs[8], UPB_UPCAST(&google_protobuf_msgs[2]), 13, 1, {0},&reftables[58], &reftables[59]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, "experimental_map_key", 9, &google_protobuf_msgs[7], NULL, 9, 4, {0},&reftables[60], &reftables[61]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, "extendee", 2, &google_protobuf_msgs[6], NULL, 7, 2, {0},&reftables[62], &reftables[63]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, "extension", 7, &google_protobuf_msgs[8], UPB_UPCAST(&google_protobuf_msgs[6]), 19, 3, {0},&reftables[64], &reftables[65]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, "extension", 6, &google_protobuf_msgs[0], UPB_UPCAST(&google_protobuf_msgs[6]), 22, 4, {0},&reftables[66], &reftables[67]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, "extension_range", 5, &google_protobuf_msgs[0], UPB_UPCAST(&google_protobuf_msgs[1]), 19, 3, {0},&reftables[68], &reftables[69]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, "field", 2, &google_protobuf_msgs[0], UPB_UPCAST(&google_protobuf_msgs[6]), 10, 0, {0},&reftables[70], &reftables[71]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, "file", 1, &google_protobuf_msgs[9], UPB_UPCAST(&google_protobuf_msgs[8]), 5, 0, {0},&reftables[72], &reftables[73]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, "identifier_value", 3, &google_protobuf_msgs[18], NULL, 6, 1, {0},&reftables[74], &reftables[75]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, "input_type", 2, &google_protobuf_msgs[12], NULL, 7, 2, {0},&reftables[76], &reftables[77]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_REQUIRED, UPB_TYPE_BOOL, 0, false, "is_extension", 2, &google_protobuf_msgs[19], NULL, 5, 1, {0},&reftables[78], &reftables[79]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_BOOL, 0, false, "java_generate_equals_and_hash", 20, &google_protobuf_msgs[10], NULL, 17, 8, {0},&reftables[80], &reftables[81]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_BOOL, 0, false, "java_generic_services", 17, &google_protobuf_msgs[10], NULL, 15, 6, {0},&reftables[82], &reftables[83]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_BOOL, 0, false, "java_multiple_files", 10, &google_protobuf_msgs[10], NULL, 13, 4, {0},&reftables[84], &reftables[85]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, "java_outer_classname", 8, &google_protobuf_msgs[10], NULL, 9, 2, {0},&reftables[86], &reftables[87]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, "java_package", 1, &google_protobuf_msgs[10], NULL, 6, 1, {0},&reftables[88], &reftables[89]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_ENUM, 0, false, "label", 4, &google_protobuf_msgs[6], UPB_UPCAST(&google_protobuf_enums[0]), 11, 4, {0},&reftables[90], &reftables[91]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, "location", 1, &google_protobuf_msgs[16], UPB_UPCAST(&google_protobuf_msgs[17]), 5, 0, {0},&reftables[92], &reftables[93]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_BOOL, 0, false, "message_set_wire_format", 1, &google_protobuf_msgs[11], NULL, 6, 1, {0},&reftables[94], &reftables[95]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, "message_type", 4, &google_protobuf_msgs[8], UPB_UPCAST(&google_protobuf_msgs[0]), 10, 0, {0},&reftables[96], &reftables[97]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, "method", 2, &google_protobuf_msgs[14], UPB_UPCAST(&google_protobuf_msgs[12]), 6, 0, {0},&reftables[98], &reftables[99]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, "name", 2, &google_protobuf_msgs[18], UPB_UPCAST(&google_protobuf_msgs[19]), 5, 0, {0},&reftables[100], &reftables[101]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, "name", 1, &google_protobuf_msgs[8], NULL, 22, 6, {0},&reftables[102], &reftables[103]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, "name", 1, &google_protobuf_msgs[14], NULL, 8, 2, {0},&reftables[104], &reftables[105]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, "name", 1, &google_protobuf_msgs[12], NULL, 4, 1, {0},&reftables[106], &reftables[107]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, "name", 1, &google_protobuf_msgs[6], NULL, 4, 1, {0},&reftables[108], &reftables[109]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, "name", 1, &google_protobuf_msgs[4], NULL, 4, 1, {0},&reftables[110], &reftables[111]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, "name", 1, &google_protobuf_msgs[2], NULL, 8, 2, {0},&reftables[112], &reftables[113]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, "name", 1, &google_protobuf_msgs[0], NULL, 24, 6, {0},&reftables[114], &reftables[115]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_REQUIRED, UPB_TYPE_STRING, 0, false, "name_part", 1, &google_protobuf_msgs[19], NULL, 2, 0, {0},&reftables[116], &reftables[117]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_INT64, UPB_INTFMT_VARIABLE, false, "negative_int_value", 5, &google_protobuf_msgs[18], NULL, 10, 3, {0},&reftables[118], &reftables[119]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, "nested_type", 3, &google_protobuf_msgs[0], UPB_UPCAST(&google_protobuf_msgs[0]), 13, 1, {0},&reftables[120], &reftables[121]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_BOOL, 0, false, "no_standard_descriptor_accessor", 2, &google_protobuf_msgs[11], NULL, 7, 2, {0},&reftables[122], &reftables[123]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_INT32, UPB_INTFMT_VARIABLE, false, "number", 2, &google_protobuf_msgs[4], NULL, 7, 2, {0},&reftables[124], &reftables[125]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_INT32, UPB_INTFMT_VARIABLE, false, "number", 3, &google_protobuf_msgs[6], NULL, 10, 3, {0},&reftables[126], &reftables[127]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_ENUM, 0, false, "optimize_for", 9, &google_protobuf_msgs[10], UPB_UPCAST(&google_protobuf_enums[3]), 12, 3, {0},&reftables[128], &reftables[129]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_MESSAGE, 0, false, "options", 3, &google_protobuf_msgs[2], UPB_UPCAST(&google_protobuf_msgs[3]), 7, 1, {0},&reftables[130], &reftables[131]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_MESSAGE, 0, false, "options", 8, &google_protobuf_msgs[8], UPB_UPCAST(&google_protobuf_msgs[10]), 20, 4, {0},&reftables[132], &reftables[133]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_MESSAGE, 0, false, "options", 3, &google_protobuf_msgs[14], UPB_UPCAST(&google_protobuf_msgs[15]), 7, 1, {0},&reftables[134], &reftables[135]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_MESSAGE, 0, false, "options", 7, &google_protobuf_msgs[0], UPB_UPCAST(&google_protobuf_msgs[11]), 23, 5, {0},&reftables[136], &reftables[137]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_MESSAGE, 0, false, "options", 4, &google_protobuf_msgs[12], UPB_UPCAST(&google_protobuf_msgs[13]), 3, 0, {0},&reftables[138], &reftables[139]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_MESSAGE, 0, false, "options", 3, &google_protobuf_msgs[4], UPB_UPCAST(&google_protobuf_msgs[5]), 3, 0, {0},&reftables[140], &reftables[141]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_MESSAGE, 0, false, "options", 8, &google_protobuf_msgs[6], UPB_UPCAST(&google_protobuf_msgs[7]), 3, 0, {0},&reftables[142], &reftables[143]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, "output_type", 3, &google_protobuf_msgs[12], NULL, 10, 3, {0},&reftables[144], &reftables[145]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, "package", 2, &google_protobuf_msgs[8], NULL, 25, 7, {0},&reftables[146], &reftables[147]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_BOOL, 0, false, "packed", 2, &google_protobuf_msgs[7], NULL, 7, 2, {0},&reftables[148], &reftables[149]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_INT32, UPB_INTFMT_VARIABLE, false, "path", 1, &google_protobuf_msgs[17], NULL, 4, 0, {0},&reftables[150], &reftables[151]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_UINT64, UPB_INTFMT_VARIABLE, false, "positive_int_value", 4, &google_protobuf_msgs[18], NULL, 9, 2, {0},&reftables[152], &reftables[153]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_BOOL, 0, false, "py_generic_services", 18, &google_protobuf_msgs[10], NULL, 16, 7, {0},&reftables[154], &reftables[155]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, "service", 6, &google_protobuf_msgs[8], UPB_UPCAST(&google_protobuf_msgs[14]), 16, 2, {0},&reftables[156], &reftables[157]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_MESSAGE, 0, false, "source_code_info", 9, &google_protobuf_msgs[8], UPB_UPCAST(&google_protobuf_msgs[16]), 21, 5, {0},&reftables[158], &reftables[159]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_INT32, UPB_INTFMT_VARIABLE, false, "span", 2, &google_protobuf_msgs[17], NULL, 7, 1, {0},&reftables[160], &reftables[161]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_INT32, UPB_INTFMT_VARIABLE, false, "start", 1, &google_protobuf_msgs[1], NULL, 2, 0, {0},&reftables[162], &reftables[163]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_BYTES, 0, false, "string_value", 7, &google_protobuf_msgs[18], NULL, 12, 5, {0},&reftables[164], &reftables[165]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_ENUM, 0, false, "type", 5, &google_protobuf_msgs[6], UPB_UPCAST(&google_protobuf_enums[1]), 12, 5, {0},&reftables[166], &reftables[167]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, "type_name", 6, &google_protobuf_msgs[6], NULL, 13, 6, {0},&reftables[168], &reftables[169]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, "uninterpreted_option", 999, &google_protobuf_msgs[3], UPB_UPCAST(&google_protobuf_msgs[18]), 5, 0, {0},&reftables[170], &reftables[171]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, "uninterpreted_option", 999, &google_protobuf_msgs[15], UPB_UPCAST(&google_protobuf_msgs[18]), 5, 0, {0},&reftables[172], &reftables[173]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, "uninterpreted_option", 999, &google_protobuf_msgs[11], UPB_UPCAST(&google_protobuf_msgs[18]), 5, 0, {0},&reftables[174], &reftables[175]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, "uninterpreted_option", 999, &google_protobuf_msgs[10], UPB_UPCAST(&google_protobuf_msgs[18]), 5, 0, {0},&reftables[176], &reftables[177]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, "uninterpreted_option", 999, &google_protobuf_msgs[7], UPB_UPCAST(&google_protobuf_msgs[18]), 5, 0, {0},&reftables[178], &reftables[179]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, "uninterpreted_option", 999, &google_protobuf_msgs[13], UPB_UPCAST(&google_protobuf_msgs[18]), 5, 0, {0},&reftables[180], &reftables[181]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, "uninterpreted_option", 999, &google_protobuf_msgs[5], UPB_UPCAST(&google_protobuf_msgs[18]), 5, 0, {0},&reftables[182], &reftables[183]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, "value", 2, &google_protobuf_msgs[2], UPB_UPCAST(&google_protobuf_msgs[4]), 6, 0, {0},&reftables[184], &reftables[185]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, false, "aggregate_value", 8, &google_protobuf_msgs[18], NULL, 15, 6, {0},&reftables[40], &reftables[41]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_BOOL, 0, false, false, "cc_generic_services", 16, &google_protobuf_msgs[10], NULL, 14, 5, {0},&reftables[42], &reftables[43]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_ENUM, 0, false, false, "ctype", 1, &google_protobuf_msgs[7], UPB_UPCAST(&google_protobuf_enums[2]), 6, 1, {0},&reftables[44], &reftables[45]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, false, "default_value", 7, &google_protobuf_msgs[6], NULL, 16, 7, {0},&reftables[46], &reftables[47]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_STRING, 0, false, false, "dependency", 3, &google_protobuf_msgs[8], NULL, 30, 8, {0},&reftables[48], &reftables[49]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_BOOL, 0, false, false, "deprecated", 3, &google_protobuf_msgs[7], NULL, 8, 3, {0},&reftables[50], &reftables[51]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_DOUBLE, 0, false, false, "double_value", 6, &google_protobuf_msgs[18], NULL, 11, 4, {0},&reftables[52], &reftables[53]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_INT32, UPB_INTFMT_VARIABLE, false, false, "end", 2, &google_protobuf_msgs[1], NULL, 3, 1, {0},&reftables[54], &reftables[55]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, false, "enum_type", 4, &google_protobuf_msgs[0], UPB_UPCAST(&google_protobuf_msgs[2]), 16, 2, {0},&reftables[56], &reftables[57]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, false, "enum_type", 5, &google_protobuf_msgs[8], UPB_UPCAST(&google_protobuf_msgs[2]), 13, 1, {0},&reftables[58], &reftables[59]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, false, "experimental_map_key", 9, &google_protobuf_msgs[7], NULL, 9, 4, {0},&reftables[60], &reftables[61]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, false, "extendee", 2, &google_protobuf_msgs[6], NULL, 7, 2, {0},&reftables[62], &reftables[63]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, false, "extension", 7, &google_protobuf_msgs[8], UPB_UPCAST(&google_protobuf_msgs[6]), 19, 3, {0},&reftables[64], &reftables[65]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, false, "extension", 6, &google_protobuf_msgs[0], UPB_UPCAST(&google_protobuf_msgs[6]), 22, 4, {0},&reftables[66], &reftables[67]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, false, "extension_range", 5, &google_protobuf_msgs[0], UPB_UPCAST(&google_protobuf_msgs[1]), 19, 3, {0},&reftables[68], &reftables[69]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, false, "field", 2, &google_protobuf_msgs[0], UPB_UPCAST(&google_protobuf_msgs[6]), 10, 0, {0},&reftables[70], &reftables[71]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, false, "file", 1, &google_protobuf_msgs[9], UPB_UPCAST(&google_protobuf_msgs[8]), 5, 0, {0},&reftables[72], &reftables[73]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, false, "identifier_value", 3, &google_protobuf_msgs[18], NULL, 6, 1, {0},&reftables[74], &reftables[75]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, false, "input_type", 2, &google_protobuf_msgs[12], NULL, 7, 2, {0},&reftables[76], &reftables[77]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_REQUIRED, UPB_TYPE_BOOL, 0, false, false, "is_extension", 2, &google_protobuf_msgs[19], NULL, 5, 1, {0},&reftables[78], &reftables[79]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_BOOL, 0, false, false, "java_generate_equals_and_hash", 20, &google_protobuf_msgs[10], NULL, 17, 8, {0},&reftables[80], &reftables[81]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_BOOL, 0, false, false, "java_generic_services", 17, &google_protobuf_msgs[10], NULL, 15, 6, {0},&reftables[82], &reftables[83]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_BOOL, 0, false, false, "java_multiple_files", 10, &google_protobuf_msgs[10], NULL, 13, 4, {0},&reftables[84], &reftables[85]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, false, "java_outer_classname", 8, &google_protobuf_msgs[10], NULL, 9, 2, {0},&reftables[86], &reftables[87]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, false, "java_package", 1, &google_protobuf_msgs[10], NULL, 6, 1, {0},&reftables[88], &reftables[89]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_ENUM, 0, false, false, "label", 4, &google_protobuf_msgs[6], UPB_UPCAST(&google_protobuf_enums[0]), 11, 4, {0},&reftables[90], &reftables[91]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, false, "location", 1, &google_protobuf_msgs[16], UPB_UPCAST(&google_protobuf_msgs[17]), 5, 0, {0},&reftables[92], &reftables[93]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_BOOL, 0, false, false, "message_set_wire_format", 1, &google_protobuf_msgs[11], NULL, 6, 1, {0},&reftables[94], &reftables[95]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, false, "message_type", 4, &google_protobuf_msgs[8], UPB_UPCAST(&google_protobuf_msgs[0]), 10, 0, {0},&reftables[96], &reftables[97]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, false, "method", 2, &google_protobuf_msgs[14], UPB_UPCAST(&google_protobuf_msgs[12]), 6, 0, {0},&reftables[98], &reftables[99]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, false, "name", 2, &google_protobuf_msgs[18], UPB_UPCAST(&google_protobuf_msgs[19]), 5, 0, {0},&reftables[100], &reftables[101]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, false, "name", 1, &google_protobuf_msgs[8], NULL, 22, 6, {0},&reftables[102], &reftables[103]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, false, "name", 1, &google_protobuf_msgs[14], NULL, 8, 2, {0},&reftables[104], &reftables[105]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, false, "name", 1, &google_protobuf_msgs[12], NULL, 4, 1, {0},&reftables[106], &reftables[107]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, false, "name", 1, &google_protobuf_msgs[6], NULL, 4, 1, {0},&reftables[108], &reftables[109]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, false, "name", 1, &google_protobuf_msgs[4], NULL, 4, 1, {0},&reftables[110], &reftables[111]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, false, "name", 1, &google_protobuf_msgs[2], NULL, 8, 2, {0},&reftables[112], &reftables[113]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, false, "name", 1, &google_protobuf_msgs[0], NULL, 24, 6, {0},&reftables[114], &reftables[115]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_REQUIRED, UPB_TYPE_STRING, 0, false, false, "name_part", 1, &google_protobuf_msgs[19], NULL, 2, 0, {0},&reftables[116], &reftables[117]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_INT64, UPB_INTFMT_VARIABLE, false, false, "negative_int_value", 5, &google_protobuf_msgs[18], NULL, 10, 3, {0},&reftables[118], &reftables[119]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, false, "nested_type", 3, &google_protobuf_msgs[0], UPB_UPCAST(&google_protobuf_msgs[0]), 13, 1, {0},&reftables[120], &reftables[121]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_BOOL, 0, false, false, "no_standard_descriptor_accessor", 2, &google_protobuf_msgs[11], NULL, 7, 2, {0},&reftables[122], &reftables[123]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_INT32, UPB_INTFMT_VARIABLE, false, false, "number", 2, &google_protobuf_msgs[4], NULL, 7, 2, {0},&reftables[124], &reftables[125]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_INT32, UPB_INTFMT_VARIABLE, false, false, "number", 3, &google_protobuf_msgs[6], NULL, 10, 3, {0},&reftables[126], &reftables[127]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_ENUM, 0, false, false, "optimize_for", 9, &google_protobuf_msgs[10], UPB_UPCAST(&google_protobuf_enums[3]), 12, 3, {0},&reftables[128], &reftables[129]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_MESSAGE, 0, false, false, "options", 3, &google_protobuf_msgs[2], UPB_UPCAST(&google_protobuf_msgs[3]), 7, 1, {0},&reftables[130], &reftables[131]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_MESSAGE, 0, false, false, "options", 8, &google_protobuf_msgs[8], UPB_UPCAST(&google_protobuf_msgs[10]), 20, 4, {0},&reftables[132], &reftables[133]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_MESSAGE, 0, false, false, "options", 3, &google_protobuf_msgs[14], UPB_UPCAST(&google_protobuf_msgs[15]), 7, 1, {0},&reftables[134], &reftables[135]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_MESSAGE, 0, false, false, "options", 7, &google_protobuf_msgs[0], UPB_UPCAST(&google_protobuf_msgs[11]), 23, 5, {0},&reftables[136], &reftables[137]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_MESSAGE, 0, false, false, "options", 4, &google_protobuf_msgs[12], UPB_UPCAST(&google_protobuf_msgs[13]), 3, 0, {0},&reftables[138], &reftables[139]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_MESSAGE, 0, false, false, "options", 3, &google_protobuf_msgs[4], UPB_UPCAST(&google_protobuf_msgs[5]), 3, 0, {0},&reftables[140], &reftables[141]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_MESSAGE, 0, false, false, "options", 8, &google_protobuf_msgs[6], UPB_UPCAST(&google_protobuf_msgs[7]), 3, 0, {0},&reftables[142], &reftables[143]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, false, "output_type", 3, &google_protobuf_msgs[12], NULL, 10, 3, {0},&reftables[144], &reftables[145]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, false, "package", 2, &google_protobuf_msgs[8], NULL, 25, 7, {0},&reftables[146], &reftables[147]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_BOOL, 0, false, false, "packed", 2, &google_protobuf_msgs[7], NULL, 7, 2, {0},&reftables[148], &reftables[149]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_INT32, UPB_INTFMT_VARIABLE, false, false, "path", 1, &google_protobuf_msgs[17], NULL, 4, 0, {0},&reftables[150], &reftables[151]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_UINT64, UPB_INTFMT_VARIABLE, false, false, "positive_int_value", 4, &google_protobuf_msgs[18], NULL, 9, 2, {0},&reftables[152], &reftables[153]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_BOOL, 0, false, false, "py_generic_services", 18, &google_protobuf_msgs[10], NULL, 16, 7, {0},&reftables[154], &reftables[155]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, false, "service", 6, &google_protobuf_msgs[8], UPB_UPCAST(&google_protobuf_msgs[14]), 16, 2, {0},&reftables[156], &reftables[157]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_MESSAGE, 0, false, false, "source_code_info", 9, &google_protobuf_msgs[8], UPB_UPCAST(&google_protobuf_msgs[16]), 21, 5, {0},&reftables[158], &reftables[159]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_INT32, UPB_INTFMT_VARIABLE, false, false, "span", 2, &google_protobuf_msgs[17], NULL, 7, 1, {0},&reftables[160], &reftables[161]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_INT32, UPB_INTFMT_VARIABLE, false, false, "start", 1, &google_protobuf_msgs[1], NULL, 2, 0, {0},&reftables[162], &reftables[163]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_BYTES, 0, false, false, "string_value", 7, &google_protobuf_msgs[18], NULL, 12, 5, {0},&reftables[164], &reftables[165]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_ENUM, 0, false, false, "type", 5, &google_protobuf_msgs[6], UPB_UPCAST(&google_protobuf_enums[1]), 12, 5, {0},&reftables[166], &reftables[167]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, false, "type_name", 6, &google_protobuf_msgs[6], NULL, 13, 6, {0},&reftables[168], &reftables[169]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, false, "uninterpreted_option", 999, &google_protobuf_msgs[3], UPB_UPCAST(&google_protobuf_msgs[18]), 5, 0, {0},&reftables[170], &reftables[171]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, false, "uninterpreted_option", 999, &google_protobuf_msgs[15], UPB_UPCAST(&google_protobuf_msgs[18]), 5, 0, {0},&reftables[172], &reftables[173]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, false, "uninterpreted_option", 999, &google_protobuf_msgs[11], UPB_UPCAST(&google_protobuf_msgs[18]), 5, 0, {0},&reftables[174], &reftables[175]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, false, "uninterpreted_option", 999, &google_protobuf_msgs[10], UPB_UPCAST(&google_protobuf_msgs[18]), 5, 0, {0},&reftables[176], &reftables[177]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, false, "uninterpreted_option", 999, &google_protobuf_msgs[7], UPB_UPCAST(&google_protobuf_msgs[18]), 5, 0, {0},&reftables[178], &reftables[179]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, false, "uninterpreted_option", 999, &google_protobuf_msgs[13], UPB_UPCAST(&google_protobuf_msgs[18]), 5, 0, {0},&reftables[180], &reftables[181]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, false, "uninterpreted_option", 999, &google_protobuf_msgs[5], UPB_UPCAST(&google_protobuf_msgs[18]), 5, 0, {0},&reftables[182], &reftables[183]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, false, "value", 2, &google_protobuf_msgs[2], UPB_UPCAST(&google_protobuf_msgs[4]), 6, 0, {0},&reftables[184], &reftables[185]),
 };
 
 const upb_enumdef google_protobuf_enums[4] = {
diff --git a/upb/descriptor/reader.c b/upb/descriptor/reader.c
index 9dff6e9..eea6ce7 100644
--- a/upb/descriptor/reader.c
+++ b/upb/descriptor/reader.c
@@ -101,6 +101,7 @@ static void upb_deflist_qualify(upb_deflist *l, char *str, int32_t start) {
 
 void upb_descreader_init(upb_descreader *r, const upb_handlers *handlers,
                          upb_status *status) {
+  UPB_UNUSED(status);
   upb_deflist_init(&r->defs);
   upb_sink_reset(upb_descreader_input(r), handlers, r);
   r->stack_len = 0;
@@ -176,8 +177,9 @@ static bool file_endmsg(void *closure, const void *hd, upb_status *status) {
 }
 
 static size_t file_onpackage(void *closure, const void *hd, const char *buf,
-                             size_t n) {
+                             size_t n, const upb_bufhandle *handle) {
   UPB_UNUSED(hd);
+  UPB_UNUSED(handle);
   upb_descreader *r = closure;
   // XXX: see comment at the top of the file.
   upb_descreader_setscopename(r, upb_strndup(buf, n));
@@ -194,8 +196,9 @@ static bool enumval_startmsg(void *closure, const void *hd) {
 }
 
 static size_t enumval_onname(void *closure, const void *hd, const char *buf,
-                             size_t n) {
+                             size_t n, const upb_bufhandle *handle) {
   UPB_UNUSED(hd);
+  UPB_UNUSED(handle);
   upb_descreader *r = closure;
   // XXX: see comment at the top of the file.
   free(r->name);
@@ -256,8 +259,9 @@ static bool enum_endmsg(void *closure, const void *hd, upb_status *status) {
 }
 
 static size_t enum_onname(void *closure, const void *hd, const char *buf,
-                          size_t n) {
+                          size_t n, const upb_bufhandle *handle) {
   UPB_UNUSED(hd);
+  UPB_UNUSED(handle);
   upb_descreader *r = closure;
   // XXX: see comment at the top of the file.
   char *fullname = upb_strndup(buf, n);
@@ -349,7 +353,8 @@ static bool field_endmsg(void *closure, const void *hd, upb_status *status) {
   upb_descreader *r = closure;
   upb_fielddef *f = r->f;
   // TODO: verify that all required fields were present.
-  assert(upb_fielddef_number(f) != 0 && upb_fielddef_name(f) != NULL);
+  assert(upb_fielddef_number(f) != 0);
+  assert(upb_fielddef_name(f) != NULL);
   assert((upb_fielddef_subdefname(f) != NULL) == upb_fielddef_hassubdef(f));
 
   if (r->default_string) {
@@ -388,13 +393,15 @@ static bool field_onlabel(void *closure, const void *hd, int32_t val) {
 static bool field_onnumber(void *closure, const void *hd, int32_t val) {
   UPB_UNUSED(hd);
   upb_descreader *r = closure;
-  upb_fielddef_setnumber(r->f, val, NULL);
+  bool ok = upb_fielddef_setnumber(r->f, val, NULL);
+  UPB_ASSERT_VAR(ok, ok);
   return true;
 }
 
 static size_t field_onname(void *closure, const void *hd, const char *buf,
-                           size_t n) {
+                           size_t n, const upb_bufhandle *handle) {
   UPB_UNUSED(hd);
+  UPB_UNUSED(handle);
   upb_descreader *r = closure;
   // XXX: see comment at the top of the file.
   char *name = upb_strndup(buf, n);
@@ -404,8 +411,9 @@ static size_t field_onname(void *closure, const void *hd, const char *buf,
 }
 
 static size_t field_ontypename(void *closure, const void *hd, const char *buf,
-                               size_t n) {
+                               size_t n, const upb_bufhandle *handle) {
   UPB_UNUSED(hd);
+  UPB_UNUSED(handle);
   upb_descreader *r = closure;
   // XXX: see comment at the top of the file.
   char *name = upb_strndup(buf, n);
@@ -414,9 +422,22 @@ static size_t field_ontypename(void *closure, const void *hd, const char *buf,
   return n;
 }
 
-static size_t field_ondefaultval(void *closure, const void *hd,
-                                 const char *buf, size_t n) {
+static size_t field_onextendee(void *closure, const void *hd, const char *buf,
+                               size_t n, const upb_bufhandle *handle) {
+  UPB_UNUSED(hd);
+  UPB_UNUSED(handle);
+  upb_descreader *r = closure;
+  // XXX: see comment at the top of the file.
+  char *name = upb_strndup(buf, n);
+  upb_fielddef_setcontainingtypename(r->f, name, NULL);
+  free(name);
+  return n;
+}
+
+static size_t field_ondefaultval(void *closure, const void *hd, const char *buf,
+                                 size_t n, const upb_bufhandle *handle) {
   UPB_UNUSED(hd);
+  UPB_UNUSED(handle);
   upb_descreader *r = closure;
   // Have to convert from string to the correct type, but we might not know the
   // type yet, so we save it as a string until the end of the field.
@@ -448,8 +469,9 @@ static bool msg_endmsg(void *closure, const void *hd, upb_status *status) {
 }
 
 static size_t msg_onname(void *closure, const void *hd, const char *buf,
-                         size_t n) {
+                         size_t n, const upb_bufhandle *handle) {
   UPB_UNUSED(hd);
+  UPB_UNUSED(handle);
   upb_descreader *r = closure;
   upb_msgdef *m = upb_descreader_top(r);
   // XXX: see comment at the top of the file.
@@ -468,11 +490,12 @@ static bool msg_onendfield(void *closure, const void *hd) {
   return true;
 }
 
-static bool discardfield(void *closure, const void *hd) {
+static bool pushextension(void *closure, const void *hd) {
   UPB_UNUSED(hd);
   upb_descreader *r = closure;
-  // Discard extension field so we don't leak it.
-  upb_fielddef_unref(r->f, &r->defs);
+  assert(upb_fielddef_containingtypename(r->f));
+  upb_fielddef_setisextension(r->f, true);
+  upb_deflist_push(&r->defs, UPB_UPCAST(r->f));
   r->f = NULL;
   return true;
 }
@@ -492,14 +515,12 @@ static void reghandlers(void *closure, upb_handlers *h) {
     upb_handlers_setendmsg(h, &msg_endmsg, NULL);
     upb_handlers_setstring(h, f(h, "name"), &msg_onname, NULL);
     upb_handlers_setendsubmsg(h, f(h, "field"), &msg_onendfield, NULL);
-    // TODO: support extensions
-    upb_handlers_setendsubmsg(h, f(h, "extension"), &discardfield, NULL);
+    upb_handlers_setendsubmsg(h, f(h, "extension"), &pushextension, NULL);
   } else if (m == GOOGLE_PROTOBUF_FILEDESCRIPTORPROTO) {
     upb_handlers_setstartmsg(h, &file_startmsg, NULL);
     upb_handlers_setendmsg(h, &file_endmsg, NULL);
     upb_handlers_setstring(h, f(h, "package"), &file_onpackage, NULL);
-    // TODO: support extensions
-    upb_handlers_setendsubmsg(h, f(h, "extension"), &discardfield, NULL);
+    upb_handlers_setendsubmsg(h, f(h, "extension"), &pushextension, NULL);
   } else if (m == GOOGLE_PROTOBUF_ENUMVALUEDESCRIPTORPROTO) {
     upb_handlers_setstartmsg(h, &enumval_startmsg, NULL);
     upb_handlers_setendmsg(h, &enumval_endmsg, NULL);
@@ -517,6 +538,7 @@ static void reghandlers(void *closure, upb_handlers *h) {
     upb_handlers_setint32(h, f(h, "number"), &field_onnumber, NULL);
     upb_handlers_setstring(h, f(h, "name"), &field_onname, NULL);
     upb_handlers_setstring(h, f(h, "type_name"), &field_ontypename, NULL);
+    upb_handlers_setstring(h, f(h, "extendee"), &field_onextendee, NULL);
     upb_handlers_setstring(h, f(h, "default_value"), &field_ondefaultval, NULL);
   }
 }