| // 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. |
| |
| // Author: kenton@google.com (Kenton Varda) |
| // Based on original Protocol Buffers design by |
| // Sanjay Ghemawat, Jeff Dean, and others. |
| // |
| // This header is logically internal, but is made public because it is used |
| // from protocol-compiler-generated code, which may reside in other components. |
| |
| #ifndef GOOGLE_PROTOBUF_GENERATED_MESSAGE_REFLECTION_H__ |
| #define GOOGLE_PROTOBUF_GENERATED_MESSAGE_REFLECTION_H__ |
| |
| #include <string> |
| #include <vector> |
| #include <google/protobuf/stubs/casts.h> |
| #include <google/protobuf/stubs/common.h> |
| // TODO(jasonh): Remove this once the compiler change to directly include this |
| // is released to components. |
| #include <google/protobuf/generated_enum_reflection.h> |
| #include <google/protobuf/message.h> |
| #include <google/protobuf/metadata.h> |
| #include <google/protobuf/unknown_field_set.h> |
| |
| |
| namespace google { |
| namespace upb { |
| namespace google_opensource { |
| class GMR_Handlers; |
| } // namespace google_opensource |
| } // namespace upb |
| |
| namespace protobuf { |
| class DescriptorPool; |
| class MapKey; |
| class MapValueRef; |
| } |
| |
| namespace protobuf { |
| namespace internal { |
| class DefaultEmptyOneof; |
| |
| // Defined in this file. |
| class GeneratedMessageReflection; |
| |
| // Defined in other files. |
| class ExtensionSet; // extension_set.h |
| |
| // THIS CLASS IS NOT INTENDED FOR DIRECT USE. It is intended for use |
| // by generated code. This class is just a big hack that reduces code |
| // size. |
| // |
| // A GeneratedMessageReflection is an implementation of Reflection |
| // which expects all fields to be backed by simple variables located in |
| // memory. The locations are given using a base pointer and a set of |
| // offsets. |
| // |
| // It is required that the user represents fields of each type in a standard |
| // way, so that GeneratedMessageReflection can cast the void* pointer to |
| // the appropriate type. For primitive fields and string fields, each field |
| // should be represented using the obvious C++ primitive type. Enums and |
| // Messages are different: |
| // - Singular Message fields are stored as a pointer to a Message. These |
| // should start out NULL, except for in the default instance where they |
| // should start out pointing to other default instances. |
| // - Enum fields are stored as an int. This int must always contain |
| // a valid value, such that EnumDescriptor::FindValueByNumber() would |
| // not return NULL. |
| // - Repeated fields are stored as RepeatedFields or RepeatedPtrFields |
| // of whatever type the individual field would be. Strings and |
| // Messages use RepeatedPtrFields while everything else uses |
| // RepeatedFields. |
| class LIBPROTOBUF_EXPORT GeneratedMessageReflection : public Reflection { |
| public: |
| // Constructs a GeneratedMessageReflection. |
| // Parameters: |
| // descriptor: The descriptor for the message type being implemented. |
| // default_instance: The default instance of the message. This is only |
| // used to obtain pointers to default instances of embedded |
| // messages, which GetMessage() will return if the particular |
| // sub-message has not been initialized yet. (Thus, all |
| // embedded message fields *must* have non-NULL pointers |
| // in the default instance.) |
| // offsets: An array of ints giving the byte offsets, relative to |
| // the start of the message object, of each field. These can |
| // be computed at compile time using the |
| // GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET() macro, defined |
| // below. |
| // has_bits_offset: Offset in the message of an array of uint32s of size |
| // descriptor->field_count()/32, rounded up. This is a |
| // bitfield where each bit indicates whether or not the |
| // corresponding field of the message has been initialized. |
| // The bit for field index i is obtained by the expression: |
| // has_bits[i / 32] & (1 << (i % 32)) |
| // unknown_fields_offset: Offset in the message of the UnknownFieldSet for |
| // the message. |
| // extensions_offset: Offset in the message of the ExtensionSet for the |
| // message, or -1 if the message type has no extension |
| // ranges. |
| // pool: DescriptorPool to search for extension definitions. Only |
| // used by FindKnownExtensionByName() and |
| // FindKnownExtensionByNumber(). |
| // factory: MessageFactory to use to construct extension messages. |
| // object_size: The size of a message object of this type, as measured |
| // by sizeof(). |
| GeneratedMessageReflection(const Descriptor* descriptor, |
| const Message* default_instance, |
| const int offsets[], |
| int has_bits_offset, |
| int unknown_fields_offset, |
| int extensions_offset, |
| const DescriptorPool* pool, |
| MessageFactory* factory, |
| int object_size, |
| int arena_offset, |
| int is_default_instance_offset = -1); |
| |
| // Similar with the construction above. Call this construction if the |
| // message has oneof definition. |
| // Parameters: |
| // offsets: An array of ints giving the byte offsets. |
| // For each oneof field, the offset is relative to the |
| // default_oneof_instance. These can be computed at compile |
| // time using the |
| // PROTO2_GENERATED_DEFAULT_ONEOF_FIELD_OFFSET() macro. |
| // For each none oneof field, the offset is related to |
| // the start of the message object. These can be computed |
| // at compile time using the |
| // GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET() macro. |
| // Besides offsets for all fields, this array also contains |
| // offsets for oneof unions. The offset of the i-th oneof |
| // union is offsets[descriptor->field_count() + i]. |
| // default_oneof_instance: The default instance of the oneofs. It is a |
| // struct holding the default value of all oneof fields |
| // for this message. It is only used to obtain pointers |
| // to default instances of oneof fields, which Get |
| // methods will return if the field is not set. |
| // oneof_case_offset: Offset in the message of an array of uint32s of |
| // size descriptor->oneof_decl_count(). Each uint32 |
| // indicates what field is set for each oneof. |
| // other parameters are the same with the construction above. |
| GeneratedMessageReflection(const Descriptor* descriptor, |
| const Message* default_instance, |
| const int offsets[], |
| int has_bits_offset, |
| int unknown_fields_offset, |
| int extensions_offset, |
| const void* default_oneof_instance, |
| int oneof_case_offset, |
| const DescriptorPool* pool, |
| MessageFactory* factory, |
| int object_size, |
| int arena_offset, |
| int is_default_instance_offset = -1); |
| ~GeneratedMessageReflection(); |
| |
| // Shorter-to-call helpers for the above two constructions that work if the |
| // pool and factory are the usual, namely, DescriptorPool::generated_pool() |
| // and MessageFactory::generated_factory(). |
| |
| static GeneratedMessageReflection* NewGeneratedMessageReflection( |
| const Descriptor* descriptor, |
| const Message* default_instance, |
| const int offsets[], |
| int has_bits_offset, |
| int unknown_fields_offset, |
| int extensions_offset, |
| const void* default_oneof_instance, |
| int oneof_case_offset, |
| int object_size, |
| int arena_offset, |
| int is_default_instance_offset = -1); |
| |
| static GeneratedMessageReflection* NewGeneratedMessageReflection( |
| const Descriptor* descriptor, |
| const Message* default_instance, |
| const int offsets[], |
| int has_bits_offset, |
| int unknown_fields_offset, |
| int extensions_offset, |
| int object_size, |
| int arena_offset, |
| int is_default_instance_offset = -1); |
| |
| // implements Reflection ------------------------------------------- |
| |
| const UnknownFieldSet& GetUnknownFields(const Message& message) const; |
| UnknownFieldSet* MutableUnknownFields(Message* message) const; |
| |
| int SpaceUsed(const Message& message) const; |
| |
| bool HasField(const Message& message, const FieldDescriptor* field) const; |
| int FieldSize(const Message& message, const FieldDescriptor* field) const; |
| void ClearField(Message* message, const FieldDescriptor* field) const; |
| bool HasOneof(const Message& message, |
| const OneofDescriptor* oneof_descriptor) const; |
| void ClearOneof(Message* message, const OneofDescriptor* field) const; |
| void RemoveLast(Message* message, const FieldDescriptor* field) const; |
| Message* ReleaseLast(Message* message, const FieldDescriptor* field) const; |
| void Swap(Message* message1, Message* message2) const; |
| void SwapFields(Message* message1, Message* message2, |
| const vector<const FieldDescriptor*>& fields) const; |
| void SwapElements(Message* message, const FieldDescriptor* field, |
| int index1, int index2) const; |
| void ListFields(const Message& message, |
| vector<const FieldDescriptor*>* output) const; |
| |
| int32 GetInt32 (const Message& message, |
| const FieldDescriptor* field) const; |
| int64 GetInt64 (const Message& message, |
| const FieldDescriptor* field) const; |
| uint32 GetUInt32(const Message& message, |
| const FieldDescriptor* field) const; |
| uint64 GetUInt64(const Message& message, |
| const FieldDescriptor* field) const; |
| float GetFloat (const Message& message, |
| const FieldDescriptor* field) const; |
| double GetDouble(const Message& message, |
| const FieldDescriptor* field) const; |
| bool GetBool (const Message& message, |
| const FieldDescriptor* field) const; |
| string GetString(const Message& message, |
| const FieldDescriptor* field) const; |
| const string& GetStringReference(const Message& message, |
| const FieldDescriptor* field, |
| string* scratch) const; |
| const EnumValueDescriptor* GetEnum(const Message& message, |
| const FieldDescriptor* field) const; |
| int GetEnumValue(const Message& message, |
| const FieldDescriptor* field) const; |
| const Message& GetMessage(const Message& message, |
| const FieldDescriptor* field, |
| MessageFactory* factory = NULL) const; |
| |
| const FieldDescriptor* GetOneofFieldDescriptor( |
| const Message& message, |
| const OneofDescriptor* oneof_descriptor) const; |
| |
| private: |
| bool ContainsMapKey(const Message& message, |
| const FieldDescriptor* field, |
| const MapKey& key) const; |
| bool InsertOrLookupMapValue(Message* message, |
| const FieldDescriptor* field, |
| const MapKey& key, |
| MapValueRef* val) const; |
| bool DeleteMapValue(Message* message, |
| const FieldDescriptor* field, |
| const MapKey& key) const; |
| MapIterator MapBegin( |
| Message* message, |
| const FieldDescriptor* field) const; |
| MapIterator MapEnd( |
| Message* message, |
| const FieldDescriptor* field) const; |
| int MapSize(const Message& message, const FieldDescriptor* field) const; |
| |
| public: |
| void SetInt32 (Message* message, |
| const FieldDescriptor* field, int32 value) const; |
| void SetInt64 (Message* message, |
| const FieldDescriptor* field, int64 value) const; |
| void SetUInt32(Message* message, |
| const FieldDescriptor* field, uint32 value) const; |
| void SetUInt64(Message* message, |
| const FieldDescriptor* field, uint64 value) const; |
| void SetFloat (Message* message, |
| const FieldDescriptor* field, float value) const; |
| void SetDouble(Message* message, |
| const FieldDescriptor* field, double value) const; |
| void SetBool (Message* message, |
| const FieldDescriptor* field, bool value) const; |
| void SetString(Message* message, |
| const FieldDescriptor* field, |
| const string& value) const; |
| void SetEnum (Message* message, const FieldDescriptor* field, |
| const EnumValueDescriptor* value) const; |
| void SetEnumValue(Message* message, const FieldDescriptor* field, |
| int value) const; |
| Message* MutableMessage(Message* message, const FieldDescriptor* field, |
| MessageFactory* factory = NULL) const; |
| void SetAllocatedMessage(Message* message, |
| Message* sub_message, |
| const FieldDescriptor* field) const; |
| Message* ReleaseMessage(Message* message, const FieldDescriptor* field, |
| MessageFactory* factory = NULL) const; |
| |
| int32 GetRepeatedInt32 (const Message& message, |
| const FieldDescriptor* field, int index) const; |
| int64 GetRepeatedInt64 (const Message& message, |
| const FieldDescriptor* field, int index) const; |
| uint32 GetRepeatedUInt32(const Message& message, |
| const FieldDescriptor* field, int index) const; |
| uint64 GetRepeatedUInt64(const Message& message, |
| const FieldDescriptor* field, int index) const; |
| float GetRepeatedFloat (const Message& message, |
| const FieldDescriptor* field, int index) const; |
| double GetRepeatedDouble(const Message& message, |
| const FieldDescriptor* field, int index) const; |
| bool GetRepeatedBool (const Message& message, |
| const FieldDescriptor* field, int index) const; |
| string GetRepeatedString(const Message& message, |
| const FieldDescriptor* field, int index) const; |
| const string& GetRepeatedStringReference(const Message& message, |
| const FieldDescriptor* field, |
| int index, string* scratch) const; |
| const EnumValueDescriptor* GetRepeatedEnum(const Message& message, |
| const FieldDescriptor* field, |
| int index) const; |
| int GetRepeatedEnumValue(const Message& message, |
| const FieldDescriptor* field, |
| int index) const; |
| const Message& GetRepeatedMessage(const Message& message, |
| const FieldDescriptor* field, |
| int index) const; |
| |
| // Set the value of a field. |
| void SetRepeatedInt32 (Message* message, |
| const FieldDescriptor* field, int index, int32 value) const; |
| void SetRepeatedInt64 (Message* message, |
| const FieldDescriptor* field, int index, int64 value) const; |
| void SetRepeatedUInt32(Message* message, |
| const FieldDescriptor* field, int index, uint32 value) const; |
| void SetRepeatedUInt64(Message* message, |
| const FieldDescriptor* field, int index, uint64 value) const; |
| void SetRepeatedFloat (Message* message, |
| const FieldDescriptor* field, int index, float value) const; |
| void SetRepeatedDouble(Message* message, |
| const FieldDescriptor* field, int index, double value) const; |
| void SetRepeatedBool (Message* message, |
| const FieldDescriptor* field, int index, bool value) const; |
| void SetRepeatedString(Message* message, |
| const FieldDescriptor* field, int index, |
| const string& value) const; |
| void SetRepeatedEnum(Message* message, const FieldDescriptor* field, |
| int index, const EnumValueDescriptor* value) const; |
| void SetRepeatedEnumValue(Message* message, const FieldDescriptor* field, |
| int index, int value) const; |
| // Get a mutable pointer to a field with a message type. |
| Message* MutableRepeatedMessage(Message* message, |
| const FieldDescriptor* field, |
| int index) const; |
| |
| void AddInt32 (Message* message, |
| const FieldDescriptor* field, int32 value) const; |
| void AddInt64 (Message* message, |
| const FieldDescriptor* field, int64 value) const; |
| void AddUInt32(Message* message, |
| const FieldDescriptor* field, uint32 value) const; |
| void AddUInt64(Message* message, |
| const FieldDescriptor* field, uint64 value) const; |
| void AddFloat (Message* message, |
| const FieldDescriptor* field, float value) const; |
| void AddDouble(Message* message, |
| const FieldDescriptor* field, double value) const; |
| void AddBool (Message* message, |
| const FieldDescriptor* field, bool value) const; |
| void AddString(Message* message, |
| const FieldDescriptor* field, const string& value) const; |
| void AddEnum(Message* message, |
| const FieldDescriptor* field, |
| const EnumValueDescriptor* value) const; |
| void AddEnumValue(Message* message, |
| const FieldDescriptor* field, |
| int value) const; |
| Message* AddMessage(Message* message, const FieldDescriptor* field, |
| MessageFactory* factory = NULL) const; |
| void AddAllocatedMessage( |
| Message* message, const FieldDescriptor* field, |
| Message* new_entry) const; |
| |
| const FieldDescriptor* FindKnownExtensionByName(const string& name) const; |
| const FieldDescriptor* FindKnownExtensionByNumber(int number) const; |
| |
| bool SupportsUnknownEnumValues() const; |
| |
| // This value for arena_offset_ indicates that there is no arena pointer in |
| // this message (e.g., old generated code). |
| static const int kNoArenaPointer = -1; |
| |
| // This value for unknown_field_offset_ indicates that there is no |
| // UnknownFieldSet in this message, and that instead, we are using the |
| // Zero-Overhead Arena Pointer trick. When this is the case, arena_offset_ |
| // actually indexes to an InternalMetadataWithArena instance, which can return |
| // either an arena pointer or an UnknownFieldSet or both. It is never the case |
| // that unknown_field_offset_ == kUnknownFieldSetInMetadata && arena_offset_ |
| // == kNoArenaPointer. |
| static const int kUnknownFieldSetInMetadata = -1; |
| |
| protected: |
| void* MutableRawRepeatedField( |
| Message* message, const FieldDescriptor* field, FieldDescriptor::CppType, |
| int ctype, const Descriptor* desc) const; |
| |
| const void* GetRawRepeatedField( |
| const Message& message, const FieldDescriptor* field, |
| FieldDescriptor::CppType, int ctype, |
| const Descriptor* desc) const; |
| |
| virtual MessageFactory* GetMessageFactory() const; |
| |
| virtual void* RepeatedFieldData( |
| Message* message, const FieldDescriptor* field, |
| FieldDescriptor::CppType cpp_type, |
| const Descriptor* message_type) const; |
| |
| private: |
| friend class GeneratedMessage; |
| |
| // To parse directly into a proto2 generated class, the class GMR_Handlers |
| // needs access to member offsets and hasbits. |
| friend class upb::google_opensource::GMR_Handlers; |
| |
| const Descriptor* descriptor_; |
| const Message* default_instance_; |
| const void* default_oneof_instance_; |
| const int* offsets_; |
| |
| int has_bits_offset_; |
| int oneof_case_offset_; |
| int unknown_fields_offset_; |
| int extensions_offset_; |
| int arena_offset_; |
| int is_default_instance_offset_; |
| int object_size_; |
| |
| static const int kHasNoDefaultInstanceField = -1; |
| |
| const DescriptorPool* descriptor_pool_; |
| MessageFactory* message_factory_; |
| |
| template <typename Type> |
| inline const Type& GetRaw(const Message& message, |
| const FieldDescriptor* field) const; |
| template <typename Type> |
| inline Type* MutableRaw(Message* message, |
| const FieldDescriptor* field) const; |
| template <typename Type> |
| inline const Type& DefaultRaw(const FieldDescriptor* field) const; |
| template <typename Type> |
| inline const Type& DefaultOneofRaw(const FieldDescriptor* field) const; |
| |
| inline const uint32* GetHasBits(const Message& message) const; |
| inline uint32* MutableHasBits(Message* message) const; |
| inline uint32 GetOneofCase( |
| const Message& message, |
| const OneofDescriptor* oneof_descriptor) const; |
| inline uint32* MutableOneofCase( |
| Message* message, |
| const OneofDescriptor* oneof_descriptor) const; |
| inline const ExtensionSet& GetExtensionSet(const Message& message) const; |
| inline ExtensionSet* MutableExtensionSet(Message* message) const; |
| inline Arena* GetArena(Message* message) const; |
| inline const internal::InternalMetadataWithArena& |
| GetInternalMetadataWithArena(const Message& message) const; |
| inline internal::InternalMetadataWithArena* |
| MutableInternalMetadataWithArena(Message* message) const; |
| |
| inline bool GetIsDefaultInstance(const Message& message) const; |
| |
| inline bool HasBit(const Message& message, |
| const FieldDescriptor* field) const; |
| inline void SetBit(Message* message, |
| const FieldDescriptor* field) const; |
| inline void ClearBit(Message* message, |
| const FieldDescriptor* field) const; |
| inline void SwapBit(Message* message1, |
| Message* message2, |
| const FieldDescriptor* field) const; |
| |
| // This function only swaps the field. Should swap corresponding has_bit |
| // before or after using this function. |
| void SwapField(Message* message1, |
| Message* message2, |
| const FieldDescriptor* field) const; |
| |
| void SwapOneofField(Message* message1, |
| Message* message2, |
| const OneofDescriptor* oneof_descriptor) const; |
| |
| inline bool HasOneofField(const Message& message, |
| const FieldDescriptor* field) const; |
| inline void SetOneofCase(Message* message, |
| const FieldDescriptor* field) const; |
| inline void ClearOneofField(Message* message, |
| const FieldDescriptor* field) const; |
| |
| template <typename Type> |
| inline const Type& GetField(const Message& message, |
| const FieldDescriptor* field) const; |
| template <typename Type> |
| inline void SetField(Message* message, |
| const FieldDescriptor* field, const Type& value) const; |
| template <typename Type> |
| inline Type* MutableField(Message* message, |
| const FieldDescriptor* field) const; |
| template <typename Type> |
| inline const Type& GetRepeatedField(const Message& message, |
| const FieldDescriptor* field, |
| int index) const; |
| template <typename Type> |
| inline const Type& GetRepeatedPtrField(const Message& message, |
| const FieldDescriptor* field, |
| int index) const; |
| template <typename Type> |
| inline void SetRepeatedField(Message* message, |
| const FieldDescriptor* field, int index, |
| Type value) const; |
| template <typename Type> |
| inline Type* MutableRepeatedField(Message* message, |
| const FieldDescriptor* field, |
| int index) const; |
| template <typename Type> |
| inline void AddField(Message* message, |
| const FieldDescriptor* field, const Type& value) const; |
| template <typename Type> |
| inline Type* AddField(Message* message, |
| const FieldDescriptor* field) const; |
| |
| int GetExtensionNumberOrDie(const Descriptor* type) const; |
| |
| // Internal versions of EnumValue API perform no checking. Called after checks |
| // by public methods. |
| void SetEnumValueInternal(Message* message, |
| const FieldDescriptor* field, |
| int value) const; |
| void SetRepeatedEnumValueInternal(Message* message, |
| const FieldDescriptor* field, |
| int index, |
| int value) const; |
| void AddEnumValueInternal(Message* message, |
| const FieldDescriptor* field, |
| int value) const; |
| |
| |
| Message* UnsafeArenaReleaseMessage(Message* message, |
| const FieldDescriptor* field, |
| MessageFactory* factory = NULL) const; |
| |
| void UnsafeArenaSetAllocatedMessage(Message* message, |
| Message* sub_message, |
| const FieldDescriptor* field) const; |
| |
| internal::MapFieldBase* MapData( |
| Message* message, const FieldDescriptor* field) const; |
| |
| GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(GeneratedMessageReflection); |
| }; |
| |
| // Returns the offset of the given field within the given aggregate type. |
| // This is equivalent to the ANSI C offsetof() macro. However, according |
| // to the C++ standard, offsetof() only works on POD types, and GCC |
| // enforces this requirement with a warning. In practice, this rule is |
| // unnecessarily strict; there is probably no compiler or platform on |
| // which the offsets of the direct fields of a class are non-constant. |
| // Fields inherited from superclasses *can* have non-constant offsets, |
| // but that's not what this macro will be used for. |
| #if defined(__clang__) |
| // For Clang we use __builtin_offsetof() and suppress the warning, |
| // to avoid Control Flow Integrity and UBSan vptr sanitizers from |
| // crashing while trying to validate the invalid reinterpet_casts. |
| #define GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(TYPE, FIELD) \ |
| _Pragma("clang diagnostic push") \ |
| _Pragma("clang diagnostic ignored \"-Winvalid-offsetof\"") \ |
| __builtin_offsetof(TYPE, FIELD) \ |
| _Pragma("clang diagnostic pop") |
| #else |
| // Note that we calculate relative to the pointer value 16 here since if we |
| // just use zero, GCC complains about dereferencing a NULL pointer. We |
| // choose 16 rather than some other number just in case the compiler would |
| // be confused by an unaligned pointer. |
| #define GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(TYPE, FIELD) \ |
| static_cast<int>( \ |
| reinterpret_cast<const char*>( \ |
| &reinterpret_cast<const TYPE*>(16)->FIELD) - \ |
| reinterpret_cast<const char*>(16)) |
| #endif |
| |
| #define PROTO2_GENERATED_DEFAULT_ONEOF_FIELD_OFFSET(ONEOF, FIELD) \ |
| static_cast<int>( \ |
| reinterpret_cast<const char*>(&(ONEOF->FIELD)) \ |
| - reinterpret_cast<const char*>(ONEOF)) |
| |
| // There are some places in proto2 where dynamic_cast would be useful as an |
| // optimization. For example, take Message::MergeFrom(const Message& other). |
| // For a given generated message FooMessage, we generate these two methods: |
| // void MergeFrom(const FooMessage& other); |
| // void MergeFrom(const Message& other); |
| // The former method can be implemented directly in terms of FooMessage's |
| // inline accessors, but the latter method must work with the reflection |
| // interface. However, if the parameter to the latter method is actually of |
| // type FooMessage, then we'd like to be able to just call the other method |
| // as an optimization. So, we use dynamic_cast to check this. |
| // |
| // That said, dynamic_cast requires RTTI, which many people like to disable |
| // for performance and code size reasons. When RTTI is not available, we |
| // still need to produce correct results. So, in this case we have to fall |
| // back to using reflection, which is what we would have done anyway if the |
| // objects were not of the exact same class. |
| // |
| // dynamic_cast_if_available() implements this logic. If RTTI is |
| // enabled, it does a dynamic_cast. If RTTI is disabled, it just returns |
| // NULL. |
| // |
| // If you need to compile without RTTI, simply #define GOOGLE_PROTOBUF_NO_RTTI. |
| // On MSVC, this should be detected automatically. |
| template<typename To, typename From> |
| inline To dynamic_cast_if_available(From from) { |
| #if defined(GOOGLE_PROTOBUF_NO_RTTI) || (defined(_MSC_VER)&&!defined(_CPPRTTI)) |
| return NULL; |
| #else |
| return dynamic_cast<To>(from); |
| #endif |
| } |
| |
| // Tries to downcast this message to a generated message type. |
| // Returns NULL if this class is not an instance of T. |
| // |
| // This is like dynamic_cast_if_available, except it works even when |
| // dynamic_cast is not available by using Reflection. However it only works |
| // with Message objects. |
| // |
| // TODO(haberman): can we remove dynamic_cast_if_available in favor of this? |
| template <typename T> |
| T* DynamicCastToGenerated(const Message* from) { |
| // Compile-time assert that T is a generated type that has a |
| // default_instance() accessor, but avoid actually calling it. |
| const T&(*get_default_instance)() = &T::default_instance; |
| (void)get_default_instance; |
| |
| // Compile-time assert that T is a subclass of google::protobuf::Message. |
| const Message* unused = static_cast<T*>(NULL); |
| (void)unused; |
| |
| #if defined(GOOGLE_PROTOBUF_NO_RTTI) || \ |
| (defined(_MSC_VER) && !defined(_CPPRTTI)) |
| bool ok = &T::default_instance() == |
| from->GetReflection()->GetMessageFactory()->GetPrototype( |
| from->GetDescriptor()); |
| return ok ? down_cast<T*>(from) : NULL; |
| #else |
| return dynamic_cast<T*>(from); |
| #endif |
| } |
| |
| template <typename T> |
| T* DynamicCastToGenerated(Message* from) { |
| const Message* message_const = from; |
| return const_cast<T*>(DynamicCastToGenerated<const T>(message_const)); |
| } |
| |
| } // namespace internal |
| } // namespace protobuf |
| |
| } // namespace google |
| #endif // GOOGLE_PROTOBUF_GENERATED_MESSAGE_REFLECTION_H__ |
