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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.
// Author: kenton@google.com (Kenton Varda)
// Based on original Protocol Buffers design by
// Sanjay Ghemawat, Jeff Dean, and others.
#ifndef GOOGLE_PROTOBUF_COMPILER_CPP_FIELD_H__
#define GOOGLE_PROTOBUF_COMPILER_CPP_FIELD_H__
#include <map>
#include <memory>
#include <string>
#include <google/protobuf/compiler/cpp/cpp_helpers.h>
#include <google/protobuf/compiler/cpp/cpp_options.h>
#include <google/protobuf/descriptor.h>
namespace google {
namespace protobuf {
namespace io {
class Printer; // printer.h
}
}
namespace protobuf {
namespace compiler {
namespace cpp {
// Helper function: set variables in the map that are the same for all
// field code generators.
// ['name', 'index', 'number', 'classname', 'declared_type', 'tag_size',
// 'deprecation'].
void SetCommonFieldVariables(const FieldDescriptor* descriptor,
std::map<string, string>* variables,
const Options& options);
void SetCommonOneofFieldVariables(const FieldDescriptor* descriptor,
std::map<string, string>* variables);
class FieldGenerator {
public:
explicit FieldGenerator(const Options& options) : options_(options) {}
virtual ~FieldGenerator();
// Generate lines of code declaring members fields of the message class
// needed to represent this field. These are placed inside the message
// class.
virtual void GeneratePrivateMembers(io::Printer* printer) const = 0;
// Generate static default variable for this field. These are placed inside
// the message class. Most field types don't need this, so the default
// implementation is empty.
virtual void GenerateStaticMembers(io::Printer* /*printer*/) const {}
// Generate prototypes for all of the accessor functions related to this
// field. These are placed inside the class definition.
virtual void GenerateAccessorDeclarations(io::Printer* printer) const = 0;
// Generate inline definitions of accessor functions for this field.
// These are placed inside the header after all class definitions.
virtual void GenerateInlineAccessorDefinitions(
io::Printer* printer) const = 0;
// Generate definitions of accessors that aren't inlined. These are
// placed somewhere in the .cc file.
// Most field types don't need this, so the default implementation is empty.
virtual void GenerateNonInlineAccessorDefinitions(
io::Printer* /*printer*/) const {}
// Generate lines of code (statements, not declarations) which clear the
// field. This is used to define the clear_$name$() method
virtual void GenerateClearingCode(io::Printer* printer) const = 0;
// Generate lines of code (statements, not declarations) which clear the field
// as part of the Clear() method for the whole message. For message types
// which have field presence bits, MessageGenerator::GenerateClear will have
// already checked the presence bits.
//
// Since most field types can re-use GenerateClearingCode, this method is not
// pure virtual.
virtual void GenerateMessageClearingCode(io::Printer* printer) const {
GenerateClearingCode(printer);
}
// Generate lines of code (statements, not declarations) which merges the
// contents of the field from the current message to the target message,
// which is stored in the generated code variable "from".
// This is used to fill in the MergeFrom method for the whole message.
// Details of this usage can be found in message.cc under the
// GenerateMergeFrom method.
virtual void GenerateMergingCode(io::Printer* printer) const = 0;
// Generates a copy constructor
virtual void GenerateCopyConstructorCode(io::Printer* printer) const = 0;
// Generate lines of code (statements, not declarations) which swaps
// this field and the corresponding field of another message, which
// is stored in the generated code variable "other". This is used to
// define the Swap method. Details of usage can be found in
// message.cc under the GenerateSwap method.
virtual void GenerateSwappingCode(io::Printer* printer) const = 0;
// Generate initialization code for private members declared by
// GeneratePrivateMembers(). These go into the message class's SharedCtor()
// method, invoked by each of the generated constructors.
virtual void GenerateConstructorCode(io::Printer* printer) const = 0;
// Generate any code that needs to go in the class's SharedDtor() method,
// invoked by the destructor.
// Most field types don't need this, so the default implementation is empty.
virtual void GenerateDestructorCode(io::Printer* /*printer*/) const {}
// Generate a manual destructor invocation for use when the message is on an
// arena. The code that this method generates will be executed inside a
// shared-for-the-whole-message-class method registered with OwnDestructor().
// The method should return |true| if it generated any code that requires a
// call; this allows the message generator to eliminate the OwnDestructor()
// registration if no fields require it.
virtual bool GenerateArenaDestructorCode(io::Printer* printer) const {
return false;
}
// Generate code that allocates the fields's default instance.
virtual void GenerateDefaultInstanceAllocator(io::Printer* /*printer*/)
const {}
// Generate lines to decode this field, which will be placed inside the
// message's MergeFromCodedStream() method.
virtual void GenerateMergeFromCodedStream(io::Printer* printer) const = 0;
// Returns true if this field's "MergeFromCodedStream" code needs the arena
// to be defined as a variable.
virtual bool MergeFromCodedStreamNeedsArena() const { return false; }
// Generate lines to decode this field from a packed value, which will be
// placed inside the message's MergeFromCodedStream() method.
virtual void GenerateMergeFromCodedStreamWithPacking(io::Printer* printer)
const;
// Generate lines to serialize this field, which are placed within the
// message's SerializeWithCachedSizes() method.
virtual void GenerateSerializeWithCachedSizes(io::Printer* printer) const = 0;
// Generate lines to serialize this field directly to the array "target",
// which are placed within the message's SerializeWithCachedSizesToArray()
// method. This must also advance "target" past the written bytes.
virtual void GenerateSerializeWithCachedSizesToArray(
io::Printer* printer) const = 0;
// Generate lines to compute the serialized size of this field, which
// are placed in the message's ByteSize() method.
virtual void GenerateByteSize(io::Printer* printer) const = 0;
// Any tags about field layout decisions (such as inlining) to embed in the
// offset.
virtual uint32 CalculateFieldTag() const { return 0; }
virtual bool IsInlined() const { return false; }
protected:
const Options& options_;
private:
GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(FieldGenerator);
};
// Convenience class which constructs FieldGenerators for a Descriptor.
class FieldGeneratorMap {
public:
FieldGeneratorMap(const Descriptor* descriptor, const Options& options,
SCCAnalyzer* scc_analyzer);
~FieldGeneratorMap();
const FieldGenerator& get(const FieldDescriptor* field) const;
private:
const Descriptor* descriptor_;
const Options& options_;
std::vector<std::unique_ptr<FieldGenerator>> field_generators_;
static FieldGenerator* MakeGenerator(const FieldDescriptor* field,
const Options& options,
SCCAnalyzer* scc_analyzer);
GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(FieldGeneratorMap);
};
} // namespace cpp
} // namespace compiler
} // namespace protobuf
} // namespace google
#endif // GOOGLE_PROTOBUF_COMPILER_CPP_FIELD_H__
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