third_party/protobuf/3.6.1/src/google/protobuf/generated_message_table_driven.cc

// Protocol Buffers - Google's data interchange format
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#include <google/protobuf/generated_message_table_driven.h>

#include <type_traits>

#include <google/protobuf/stubs/casts.h>
#include <google/protobuf/generated_message_table_driven_lite.h>
#include <google/protobuf/io/zero_copy_stream_impl_lite.h>
#include <google/protobuf/metadata.h>
#include <google/protobuf/repeated_field.h>
#include <google/protobuf/wire_format.h>
#include <google/protobuf/wire_format_lite.h>
#include <google/protobuf/wire_format_lite_inl.h>

namespace google {
namespace protobuf {
namespace internal {

namespace {

UnknownFieldSet* MutableUnknownFields(MessageLite* msg, int64 arena_offset) {
  return Raw<InternalMetadataWithArena>(msg, arena_offset)
      ->mutable_unknown_fields();
}

struct UnknownFieldHandler {
  static bool Skip(MessageLite* msg, const ParseTable& table,
                   io::CodedInputStream* input,
                   int tag) {
    GOOGLE_DCHECK(table.unknown_field_set);

    return WireFormat::SkipField(input, tag,
        MutableUnknownFields(msg, table.arena_offset));
  }

  static void Varint(MessageLite* msg, const ParseTable& table,
                     int tag, int value) {
    GOOGLE_DCHECK(table.unknown_field_set);

    MutableUnknownFields(msg, table.arena_offset)->AddVarint(
        WireFormatLite::GetTagFieldNumber(tag), value);
  }

  static bool ParseExtension(
      MessageLite* msg, const ParseTable& table,
      io::CodedInputStream* input, int tag) {
    ExtensionSet* extensions = GetExtensionSet(msg, table.extension_offset);
    if (extensions == NULL) {
      return false;
    }

    const Message* prototype = down_cast<const Message*>(
        table.default_instance());

    GOOGLE_DCHECK(prototype != NULL);
    GOOGLE_DCHECK(table.unknown_field_set);
    UnknownFieldSet* unknown_fields =
        MutableUnknownFields(msg, table.arena_offset);

    return extensions->ParseField(tag, input, prototype, unknown_fields);
  }
};

}  // namespace

bool MergePartialFromCodedStream(
    MessageLite* msg, const ParseTable& table, io::CodedInputStream* input) {
  return MergePartialFromCodedStreamImpl<UnknownFieldHandler,
                                         InternalMetadataWithArena>(msg, table,
                                                                    input);
}

}  // namespace internal
}  // namespace protobuf
}  // namespace google