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Diffstat (limited to 'src/google/protobuf/compiler/cpp/cpp_field.h')
-rw-r--r-- | src/google/protobuf/compiler/cpp/cpp_field.h | 199 |
1 files changed, 199 insertions, 0 deletions
diff --git a/src/google/protobuf/compiler/cpp/cpp_field.h b/src/google/protobuf/compiler/cpp/cpp_field.h new file mode 100644 index 00000000..cd2b6b75 --- /dev/null +++ b/src/google/protobuf/compiler/cpp/cpp_field.h @@ -0,0 +1,199 @@ +// 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> +#ifndef _SHARED_PTR_H +#include <google/protobuf/stubs/shared_ptr.h> +#endif +#include <string> + +#include <google/protobuf/descriptor.h> +#include <google/protobuf/compiler/cpp/cpp_options.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, + map<string, string>* variables, + const Options& options); + +void SetCommonOneofFieldVariables(const FieldDescriptor* descriptor, + map<string, string>* variables); + +class FieldGenerator { + public: + FieldGenerator() {} + 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, bool is_inline) 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 as well as + // the Clear() method for the whole message. + virtual void GenerateClearingCode(io::Printer* printer) const = 0; + + // 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; + + // 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 code that should be run when ShutdownProtobufLibrary() is called, + // to delete all dynamically-allocated objects. + virtual void GenerateShutdownCode(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; + + // 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; + + private: + GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(FieldGenerator); +}; + +// Convenience class which constructs FieldGenerators for a Descriptor. +class FieldGeneratorMap { + public: + explicit FieldGeneratorMap(const Descriptor* descriptor, const Options& options); + ~FieldGeneratorMap(); + + const FieldGenerator& get(const FieldDescriptor* field) const; + + private: + const Descriptor* descriptor_; + google::protobuf::scoped_array<google::protobuf::scoped_ptr<FieldGenerator> > field_generators_; + + static FieldGenerator* MakeGenerator(const FieldDescriptor* field, + const Options& options); + + GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(FieldGeneratorMap); +}; + + +} // namespace cpp +} // namespace compiler +} // namespace protobuf + +} // namespace google +#endif // GOOGLE_PROTOBUF_COMPILER_CPP_FIELD_H__ |