Let ParseRepeatedStringOnce call AllocateFromStringBlock().

PiperOrigin-RevId: 542617650

src/google/protobuf/generated_message_tctable_impl.h

@@ -808,8 +808,8 @@ class PROTOBUF_EXPORT TcParser final {
   static inline const char* RepeatedString(PROTOBUF_TC_PARAM_DECL);
 
   static inline const char* ParseRepeatedStringOnce(
-      const char* ptr, Arena* arena, SerialArena* serial_arena,
+      const char* ptr, SerialArena* serial_arena, ParseContext* ctx,
-      ParseContext* ctx, RepeatedPtrField<std::string>& field);
+      RepeatedPtrField<std::string>& field);
 
   static void AddUnknownEnum(MessageLite* msg, const TcParseTableBase* table,
                              uint32_t tag, int32_t enum_value);

src/google/protobuf/generated_message_tctable_lite.cc

@@ -1684,7 +1684,7 @@ PROTOBUF_ALWAYS_INLINE const char* TcParser::RepeatedString(
                             field.PrepareForParse())) {
     do {
       ptr += sizeof(TagType);
-      ptr = ParseRepeatedStringOnce(ptr, arena, serial_arena, ctx, field);
+      ptr = ParseRepeatedStringOnce(ptr, serial_arena, ctx, field);
 
       if (PROTOBUF_PREDICT_FALSE(ptr == nullptr || !validate_last_string())) {
         PROTOBUF_MUSTTAIL return Error(PROTOBUF_TC_PARAM_NO_DATA_PASS);
@@ -2273,11 +2273,11 @@ PROTOBUF_NOINLINE const char* TcParser::MpString(PROTOBUF_TC_PARAM_DECL) {
 }
 
 PROTOBUF_ALWAYS_INLINE const char* TcParser::ParseRepeatedStringOnce(
-    const char* ptr, Arena* arena, SerialArena* serial_arena, ParseContext* ctx,
+    const char* ptr, SerialArena* serial_arena, ParseContext* ctx,
     RepeatedPtrField<std::string>& field) {
   int size = ReadSize(&ptr);
   if (PROTOBUF_PREDICT_FALSE(!ptr)) return {};
-  auto* str = Arena::Create<std::string>(arena);
+  auto* str = new (serial_arena->AllocateFromStringBlock()) std::string();
   field.AddAllocatedForParse(str);
   ptr = ctx->ReadString(ptr, size, str);
   if (PROTOBUF_PREDICT_FALSE(!ptr)) return {};
@@ -2312,7 +2312,7 @@ PROTOBUF_NOINLINE const char* TcParser::MpRepeatedString(
               field.PrepareForParse())) {
         do {
           ptr = ptr2;
-          ptr = ParseRepeatedStringOnce(ptr, arena, serial_arena, ctx, field);
+          ptr = ParseRepeatedStringOnce(ptr, serial_arena, ctx, field);
           if (PROTOBUF_PREDICT_FALSE(ptr == nullptr ||
                                      !MpVerifyUtf8(field[field.size() - 1],
                                                    table, entry, xform_val))) {