Squashed 'third_party/protobuf/' content from commit e35e248
Change-Id: I6cbe123d09fe50fdcad0e51466665daeee7433c7
git-subtree-dir: third_party/protobuf
git-subtree-split: e35e24800fb8d694bdeea5fd63dc7d1b14d68723
diff --git a/src/google/protobuf/map_entry_lite.h b/src/google/protobuf/map_entry_lite.h
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+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc. All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+// * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+// * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+// * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#ifndef GOOGLE_PROTOBUF_MAP_ENTRY_LITE_H__
+#define GOOGLE_PROTOBUF_MAP_ENTRY_LITE_H__
+
+#include <google/protobuf/map_type_handler.h>
+#include <google/protobuf/wire_format_lite_inl.h>
+
+namespace google {
+namespace protobuf {
+class Arena;
+namespace internal {
+template <typename Key, typename Value,
+ WireFormatLite::FieldType kKeyFieldType,
+ WireFormatLite::FieldType kValueFieldType,
+ int default_enum_value>
+class MapEntry;
+template <typename Key, typename Value,
+ WireFormatLite::FieldType kKeyFieldType,
+ WireFormatLite::FieldType kValueFieldType,
+ int default_enum_value>
+class MapFieldLite;
+} // namespace internal
+} // namespace protobuf
+
+namespace protobuf {
+namespace internal {
+
+// MapEntryLite is used to implement parsing and serialization of map for lite
+// runtime.
+template <typename Key, typename Value,
+ WireFormatLite::FieldType kKeyFieldType,
+ WireFormatLite::FieldType kValueFieldType,
+ int default_enum_value>
+class MapEntryLite : public MessageLite {
+ // Provide utilities to parse/serialize key/value. Provide utilities to
+ // manipulate internal stored type.
+ typedef MapTypeHandler<kKeyFieldType, Key> KeyTypeHandler;
+ typedef MapTypeHandler<kValueFieldType, Value> ValueTypeHandler;
+
+ // Define internal memory layout. Strings and messages are stored as
+ // pointers, while other types are stored as values.
+ typedef typename KeyTypeHandler::TypeOnMemory KeyOnMemory;
+ typedef typename ValueTypeHandler::TypeOnMemory ValueOnMemory;
+
+ // Enum type cannot be used for MapTypeHandler::Read. Define a type
+ // which will replace Enum with int.
+ typedef typename KeyTypeHandler::MapEntryAccessorType KeyMapEntryAccessorType;
+ typedef typename ValueTypeHandler::MapEntryAccessorType
+ ValueMapEntryAccessorType;
+
+ // Constants for field number.
+ static const int kKeyFieldNumber = 1;
+ static const int kValueFieldNumber = 2;
+
+ // Constants for field tag.
+ static const uint8 kKeyTag = GOOGLE_PROTOBUF_WIRE_FORMAT_MAKE_TAG(
+ kKeyFieldNumber, KeyTypeHandler::kWireType);
+ static const uint8 kValueTag = GOOGLE_PROTOBUF_WIRE_FORMAT_MAKE_TAG(
+ kValueFieldNumber, ValueTypeHandler::kWireType);
+ static const int kTagSize = 1;
+
+ public:
+ ~MapEntryLite() {
+ if (this != default_instance_) {
+ if (GetArenaNoVirtual() != NULL) return;
+ KeyTypeHandler::DeleteNoArena(key_);
+ ValueTypeHandler::DeleteNoArena(value_);
+ }
+ }
+
+ // accessors ======================================================
+
+ virtual inline const KeyMapEntryAccessorType& key() const {
+ return KeyTypeHandler::GetExternalReference(key_);
+ }
+ virtual inline const ValueMapEntryAccessorType& value() const {
+ GOOGLE_CHECK(default_instance_ != NULL);
+ return ValueTypeHandler::DefaultIfNotInitialized(value_,
+ default_instance_->value_);
+ }
+ inline KeyMapEntryAccessorType* mutable_key() {
+ set_has_key();
+ return KeyTypeHandler::EnsureMutable(&key_, GetArenaNoVirtual());
+ }
+ inline ValueMapEntryAccessorType* mutable_value() {
+ set_has_value();
+ return ValueTypeHandler::EnsureMutable(&value_, GetArenaNoVirtual());
+ }
+
+ // implements MessageLite =========================================
+
+ // MapEntryLite is for implementation only and this function isn't called
+ // anywhere. Just provide a fake implementation here for MessageLite.
+ string GetTypeName() const { return ""; }
+
+ void CheckTypeAndMergeFrom(const MessageLite& other) {
+ MergeFrom(*::google::protobuf::down_cast<const MapEntryLite*>(&other));
+ }
+
+ bool MergePartialFromCodedStream(::google::protobuf::io::CodedInputStream* input) {
+ uint32 tag;
+
+ for (;;) {
+ // 1) corrupted data: return false;
+ // 2) unknown field: skip without putting into unknown field set;
+ // 3) unknown enum value: keep it in parsing. In proto2, caller should
+ // check the value and put this entry into containing message's unknown
+ // field set if the value is an unknown enum. In proto3, caller doesn't
+ // need to care whether the value is unknown enum;
+ // 4) missing key/value: missed key/value will have default value. caller
+ // should take this entry as if key/value is set to default value.
+ tag = input->ReadTag();
+ switch (tag) {
+ case kKeyTag:
+ if (!KeyTypeHandler::Read(input, mutable_key())) {
+ return false;
+ }
+ set_has_key();
+ if (!input->ExpectTag(kValueTag)) break;
+ GOOGLE_FALLTHROUGH_INTENDED;
+
+ case kValueTag:
+ if (!ValueTypeHandler::Read(input, mutable_value())) {
+ return false;
+ }
+ set_has_value();
+ if (input->ExpectAtEnd()) return true;
+ break;
+
+ default:
+ if (tag == 0 ||
+ WireFormatLite::GetTagWireType(tag) ==
+ WireFormatLite::WIRETYPE_END_GROUP) {
+ return true;
+ }
+ if (!WireFormatLite::SkipField(input, tag)) return false;
+ break;
+ }
+ }
+ }
+
+ int ByteSize() const {
+ int size = 0;
+ size += has_key() ? kTagSize + KeyTypeHandler::ByteSize(key()) : 0;
+ size += has_value() ? kTagSize + ValueTypeHandler::ByteSize(value()) : 0;
+ return size;
+ }
+
+ void SerializeWithCachedSizes(::google::protobuf::io::CodedOutputStream* output) const {
+ KeyTypeHandler::Write(kKeyFieldNumber, key(), output);
+ ValueTypeHandler::Write(kValueFieldNumber, value(), output);
+ }
+
+ ::google::protobuf::uint8* SerializeWithCachedSizesToArray(::google::protobuf::uint8* output) const {
+ output = KeyTypeHandler::WriteToArray(kKeyFieldNumber, key(), output);
+ output = ValueTypeHandler::WriteToArray(kValueFieldNumber, value(), output);
+ return output;
+ }
+
+ int GetCachedSize() const {
+ int size = 0;
+ size += has_key()
+ ? kTagSize + KeyTypeHandler::GetCachedSize(key())
+ : 0;
+ size += has_value()
+ ? kTagSize + ValueTypeHandler::GetCachedSize(
+ value())
+ : 0;
+ return size;
+ }
+
+ bool IsInitialized() const { return ValueTypeHandler::IsInitialized(value_); }
+
+ MessageLite* New() const {
+ MapEntryLite* entry = new MapEntryLite;
+ entry->default_instance_ = default_instance_;
+ return entry;
+ }
+
+ MessageLite* New(Arena* arena) const {
+ MapEntryLite* entry = Arena::CreateMessage<MapEntryLite>(arena);
+ entry->default_instance_ = default_instance_;
+ return entry;
+ }
+
+ int SpaceUsed() const {
+ int size = sizeof(MapEntryLite);
+ size += KeyTypeHandler::SpaceUsedInMapEntry(key_);
+ size += ValueTypeHandler::SpaceUsedInMapEntry(value_);
+ return size;
+ }
+
+ void MergeFrom(const MapEntryLite& from) {
+ if (from._has_bits_[0]) {
+ if (from.has_key()) {
+ KeyTypeHandler::EnsureMutable(&key_, GetArenaNoVirtual());
+ KeyTypeHandler::Merge(from.key(), &key_, GetArenaNoVirtual());
+ set_has_key();
+ }
+ if (from.has_value()) {
+ ValueTypeHandler::EnsureMutable(&value_, GetArenaNoVirtual());
+ ValueTypeHandler::Merge(from.value(), &value_, GetArenaNoVirtual());
+ set_has_value();
+ }
+ }
+ }
+
+ void Clear() {
+ KeyTypeHandler::Clear(&key_, GetArenaNoVirtual());
+ ValueTypeHandler::ClearMaybeByDefaultEnum(
+ &value_, GetArenaNoVirtual(), default_enum_value);
+ clear_has_key();
+ clear_has_value();
+ }
+
+ void InitAsDefaultInstance() {
+ KeyTypeHandler::AssignDefaultValue(&key_);
+ ValueTypeHandler::AssignDefaultValue(&value_);
+ }
+
+ Arena* GetArena() const {
+ return GetArenaNoVirtual();
+ }
+
+ // Create a MapEntryLite for given key and value from google::protobuf::Map in
+ // serialization. This function is only called when value is enum. Enum is
+ // treated differently because its type in MapEntry is int and its type in
+ // google::protobuf::Map is enum. We cannot create a reference to int from an enum.
+ static MapEntryLite* EnumWrap(const Key& key, const Value value,
+ Arena* arena) {
+ return Arena::CreateMessage<MapEnumEntryWrapper<
+ Key, Value, kKeyFieldType, kValueFieldType, default_enum_value> >(
+ arena, key, value);
+ }
+
+ // Like above, but for all the other types. This avoids value copy to create
+ // MapEntryLite from google::protobuf::Map in serialization.
+ static MapEntryLite* Wrap(const Key& key, const Value& value, Arena* arena) {
+ return Arena::CreateMessage<MapEntryWrapper<Key, Value, kKeyFieldType,
+ kValueFieldType,
+ default_enum_value> >(
+ arena, key, value);
+ }
+
+ protected:
+ void set_has_key() { _has_bits_[0] |= 0x00000001u; }
+ bool has_key() const { return (_has_bits_[0] & 0x00000001u) != 0; }
+ void clear_has_key() { _has_bits_[0] &= ~0x00000001u; }
+ void set_has_value() { _has_bits_[0] |= 0x00000002u; }
+ bool has_value() const { return (_has_bits_[0] & 0x00000002u) != 0; }
+ void clear_has_value() { _has_bits_[0] &= ~0x00000002u; }
+
+ private:
+ // Serializing a generated message containing map field involves serializing
+ // key-value pairs from google::protobuf::Map. The wire format of each key-value pair
+ // after serialization should be the same as that of a MapEntry message
+ // containing the same key and value inside it. However, google::protobuf::Map doesn't
+ // store key and value as MapEntry message, which disables us to use existing
+ // code to serialize message. In order to use existing code to serialize
+ // message, we need to construct a MapEntry from key-value pair. But it
+ // involves copy of key and value to construct a MapEntry. In order to avoid
+ // this copy in constructing a MapEntry, we need the following class which
+ // only takes references of given key and value.
+ template <typename K, typename V, WireFormatLite::FieldType k_wire_type,
+ WireFormatLite::FieldType v_wire_type, int default_enum>
+ class MapEntryWrapper
+ : public MapEntryLite<K, V, k_wire_type, v_wire_type, default_enum> {
+ typedef MapEntryLite<K, V, k_wire_type, v_wire_type, default_enum> Base;
+ typedef typename Base::KeyMapEntryAccessorType KeyMapEntryAccessorType;
+ typedef typename Base::ValueMapEntryAccessorType ValueMapEntryAccessorType;
+
+ public:
+ MapEntryWrapper(Arena* arena, const K& key, const V& value)
+ : MapEntryLite<K, V, k_wire_type, v_wire_type, default_enum>(arena),
+ key_(key),
+ value_(value) {
+ Base::set_has_key();
+ Base::set_has_value();
+ }
+ inline const KeyMapEntryAccessorType& key() const { return key_; }
+ inline const ValueMapEntryAccessorType& value() const { return value_; }
+
+ private:
+ const Key& key_;
+ const Value& value_;
+
+ friend class ::google::protobuf::Arena;
+ typedef void InternalArenaConstructable_;
+ typedef void DestructorSkippable_;
+ };
+
+ // Like above, but for enum value only, which stores value instead of
+ // reference of value field inside. This is needed because the type of value
+ // field in constructor is an enum, while we need to store it as an int. If we
+ // initialize a reference to int with a reference to enum, compiler will
+ // generate a temporary int from enum and initialize the reference to int with
+ // the temporary.
+ template <typename K, typename V, WireFormatLite::FieldType k_wire_type,
+ WireFormatLite::FieldType v_wire_type, int default_enum>
+ class MapEnumEntryWrapper
+ : public MapEntryLite<K, V, k_wire_type, v_wire_type, default_enum> {
+ typedef MapEntryLite<K, V, k_wire_type, v_wire_type, default_enum> Base;
+ typedef typename Base::KeyMapEntryAccessorType KeyMapEntryAccessorType;
+ typedef typename Base::ValueMapEntryAccessorType ValueMapEntryAccessorType;
+
+ public:
+ MapEnumEntryWrapper(Arena* arena, const K& key, const V& value)
+ : MapEntryLite<K, V, k_wire_type, v_wire_type, default_enum>(arena),
+ key_(key),
+ value_(value) {
+ Base::set_has_key();
+ Base::set_has_value();
+ }
+ inline const KeyMapEntryAccessorType& key() const { return key_; }
+ inline const ValueMapEntryAccessorType& value() const { return value_; }
+
+ private:
+ const KeyMapEntryAccessorType& key_;
+ const ValueMapEntryAccessorType value_;
+
+ friend class google::protobuf::Arena;
+ typedef void DestructorSkippable_;
+ };
+
+ MapEntryLite() : default_instance_(NULL), arena_(NULL) {
+ KeyTypeHandler::Initialize(&key_, NULL);
+ ValueTypeHandler::InitializeMaybeByDefaultEnum(
+ &value_, default_enum_value, NULL);
+ _has_bits_[0] = 0;
+ }
+
+ explicit MapEntryLite(Arena* arena)
+ : default_instance_(NULL), arena_(arena) {
+ KeyTypeHandler::Initialize(&key_, arena);
+ ValueTypeHandler::InitializeMaybeByDefaultEnum(
+ &value_, default_enum_value, arena);
+ _has_bits_[0] = 0;
+ }
+
+ inline Arena* GetArenaNoVirtual() const {
+ return arena_;
+ }
+
+ void set_default_instance(MapEntryLite* default_instance) {
+ default_instance_ = default_instance;
+ }
+
+ MapEntryLite* default_instance_;
+
+ KeyOnMemory key_;
+ ValueOnMemory value_;
+ Arena* arena_;
+ uint32 _has_bits_[1];
+
+ friend class ::google::protobuf::Arena;
+ typedef void InternalArenaConstructable_;
+ typedef void DestructorSkippable_;
+ template <typename K, typename V, WireFormatLite::FieldType,
+ WireFormatLite::FieldType, int>
+ friend class internal::MapEntry;
+ template <typename K, typename V, WireFormatLite::FieldType,
+ WireFormatLite::FieldType, int>
+ friend class internal::MapFieldLite;
+
+ GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(MapEntryLite);
+};
+
+} // namespace internal
+} // namespace protobuf
+
+} // namespace google
+#endif // GOOGLE_PROTOBUF_MAP_ENTRY_LITE_H__