// Protocol Buffers - Google's data interchange format
// Copyright 2008 Google Inc. All rights reserved.
// http://code.google.com/p/protobuf/
//
// 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/message.h>
#include <google/protobuf/unknown_field_set.h>
namespace google {
namespace protobuf {
class DescriptorPool;
// Generated code needs these to have been forward-declared. Easier to do it
// here than to print them inside every .pb.h file.
class FileDescriptor;
class EnumDescriptor;
}
namespace protobuf {
namespace internal {
// 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);
~GeneratedMessageReflection();
// 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;
void RemoveLast(Message* message, const FieldDescriptor* field) const;
void Swap(Message* message1, Message* message2) 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;
const Message& GetMessage(const Message& message,
const FieldDescriptor* field,
MessageFactory* factory = NULL) const;
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;
Message* MutableMessage(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;
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;
// 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;
Message* AddMessage(Message* message, const FieldDescriptor* field,
MessageFactory* factory = NULL) const;
const FieldDescriptor* FindKnownExtensionByName(const string& name) const;
const FieldDescriptor* FindKnownExtensionByNumber(int number) const;
private:
friend class GeneratedMessage;
const Descriptor* descriptor_;
const Message* default_instance_;
const int* offsets_;
int has_bits_offset_;
int unknown_fields_offset_;
int extensions_offset_;
int object_size_;
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;
inline const Message* GetMessagePrototype(const FieldDescriptor* field) const;
inline const uint32* GetHasBits(const Message& message) const;
inline uint32* MutableHasBits(Message* message) const;
inline const ExtensionSet& GetExtensionSet(const Message& message) const;
inline ExtensionSet* MutableExtensionSet(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;
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;
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.
//
// 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))
// 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
}
// Helper for EnumType_Parse functions: try to parse the string 'name' as an
// enum name of the given type, returning true and filling in value on success,
// or returning false and leaving value unchanged on failure.
LIBPROTOBUF_EXPORT bool ParseNamedEnum(const EnumDescriptor* descriptor,
const string& name,
int* value);
template<typename EnumType>
bool ParseNamedEnum(const EnumDescriptor* descriptor,
const string& name,
EnumType* value) {
int tmp;
if (!ParseNamedEnum(descriptor, name, &tmp)) return false;
*value = static_cast<EnumType>(tmp);
return true;
}
// Just a wrapper around printing the name of a value. The main point of this
// function is not to be inlined, so that you can do this without including
// descriptor.h.
LIBPROTOBUF_EXPORT const string& NameOfEnum(const EnumDescriptor* descriptor, int value);
} // namespace internal
} // namespace protobuf
} // namespace google
#endif // GOOGLE_PROTOBUF_GENERATED_MESSAGE_REFLECTION_H__
