95 lines
3.1 KiB
C
95 lines
3.1 KiB
C
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// Protocol Buffers - Google's data interchange format
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// Copyright 2008 Google Inc. All rights reserved.
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//
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file or at
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// https://developers.google.com/open-source/licenses/bsd
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// Author: kenton@google.com (Kenton Varda)
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// Based on original Protocol Buffers design by
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// Sanjay Ghemawat, Jeff Dean, and others.
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#ifndef GOOGLE_PROTOBUF_COMPILER_CPP_EXTENSION_H__
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#define GOOGLE_PROTOBUF_COMPILER_CPP_EXTENSION_H__
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#include <string>
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#include "absl/container/flat_hash_map.h"
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#include "absl/strings/string_view.h"
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#include "google/protobuf/compiler/cpp/helpers.h"
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#include "google/protobuf/compiler/cpp/options.h"
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#include "google/protobuf/port.h"
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// Must be included last.
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#include "google/protobuf/port_def.inc"
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namespace google {
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namespace protobuf {
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class FieldDescriptor; // descriptor.h
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namespace io {
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class Printer; // printer.h
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}
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} // namespace protobuf
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} // namespace google
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namespace google {
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namespace protobuf {
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namespace compiler {
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namespace cpp {
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class MessageSCCAnalyzer;
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// Generates code for an extension, which may be within the scope of some
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// message or may be at file scope. This is much simpler than FieldGenerator
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// since extensions are just simple identifiers with interesting types.
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class PROTOC_EXPORT ExtensionGenerator {
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public:
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// See generator.cc for the meaning of dllexport_decl.
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explicit ExtensionGenerator(const FieldDescriptor* descriptor,
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const Options& options,
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MessageSCCAnalyzer* scc_analyzer);
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ExtensionGenerator(const ExtensionGenerator&) = delete;
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ExtensionGenerator& operator=(const ExtensionGenerator&) = delete;
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~ExtensionGenerator();
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// Header stuff.
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void GenerateDeclaration(io::Printer* p) const;
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// Source file stuff.
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void GenerateDefinition(io::Printer* p);
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// Extension registration can happen at different priority levels depending on
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// the features used.
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//
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// For Weak Descriptor messages, we must use a two phase approach where we
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// first register all the extensions that are fully linked in, and then we
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// register the rest. To do that, we register the linked in extensions on
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// priority 101 and the rest as priority 102.
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// For extensions that are missing prototypes we need to create the prototypes
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// before we can register them, but for that we need to successfully parse
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// its descriptors, which might require other extensions to be registered
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// first. All extensions required for descriptor parsing will be fully linked
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// in and registered in the first phase.
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void GenerateRegistration(io::Printer* p, InitPriority priority);
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bool WillGenerateRegistration(InitPriority priority);
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bool IsScoped() const;
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private:
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const FieldDescriptor* descriptor_;
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std::string type_traits_;
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Options options_;
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MessageSCCAnalyzer* scc_analyzer_;
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absl::flat_hash_map<absl::string_view, std::string> variables_;
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};
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} // namespace cpp
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} // namespace compiler
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} // namespace protobuf
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} // namespace google
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#include "google/protobuf/port_undef.inc"
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#endif // GOOGLE_PROTOBUF_COMPILER_CPP_MESSAGE_H__
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