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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.
#include <google/protobuf/compiler/cpp/cpp_extension.h>
#include <map>
#include <google/protobuf/compiler/cpp/cpp_helpers.h>
#include <google/protobuf/descriptor.pb.h>
#include <google/protobuf/io/printer.h>
#include <google/protobuf/stubs/strutil.h>
namespace google {
namespace protobuf {
namespace compiler {
namespace cpp {
namespace {
// Returns the fully-qualified class name of the message that this field
// extends. This function is used in the Google-internal code to handle some
// legacy cases.
TProtoStringType ExtendeeClassName(const FieldDescriptor* descriptor) {
const Descriptor* extendee = descriptor->containing_type();
return ClassName(extendee, true);
}
} // anonymous namespace
ExtensionGenerator::ExtensionGenerator(const FieldDescriptor* descriptor,
const Options& options)
: descriptor_(descriptor), options_(options) {
// Construct type_traits_.
if (descriptor_->is_repeated()) {
type_traits_ = "Repeated";
}
switch (descriptor_->cpp_type()) {
case FieldDescriptor::CPPTYPE_ENUM:
type_traits_.append("EnumTypeTraits< ");
type_traits_.append(ClassName(descriptor_->enum_type(), true));
type_traits_.append(", ");
type_traits_.append(ClassName(descriptor_->enum_type(), true));
type_traits_.append("_IsValid>");
break;
case FieldDescriptor::CPPTYPE_STRING:
type_traits_.append("StringTypeTraits");
break;
case FieldDescriptor::CPPTYPE_MESSAGE:
type_traits_.append("MessageTypeTraits< ");
type_traits_.append(ClassName(descriptor_->message_type(), true));
type_traits_.append(" >");
break;
default:
type_traits_.append("PrimitiveTypeTraits< ");
type_traits_.append(PrimitiveTypeName(options_, descriptor_->cpp_type()));
type_traits_.append(" >");
break;
}
SetCommonVars(options, &variables_);
variables_["extendee"] = ExtendeeClassName(descriptor_);
variables_["type_traits"] = type_traits_;
TProtoStringType name = descriptor_->name();
variables_["name"] = ResolveKeyword(name);
variables_["constant_name"] = FieldConstantName(descriptor_);
variables_["field_type"] =
StrCat(static_cast<int>(descriptor_->type()));
variables_["packed"] = descriptor_->is_packed() ? "true" : "false";
TProtoStringType scope =
IsScoped() ? ClassName(descriptor_->extension_scope(), false) + "::" : "";
variables_["scope"] = scope;
variables_["scoped_name"] = ExtensionName(descriptor_);
variables_["number"] = StrCat(descriptor_->number());
}
ExtensionGenerator::~ExtensionGenerator() {}
bool ExtensionGenerator::IsScoped() const {
return descriptor_->extension_scope() != nullptr;
}
void ExtensionGenerator::GenerateDeclaration(io::Printer* printer) const {
Formatter format(printer, variables_);
// If this is a class member, it needs to be declared "static". Otherwise,
// it needs to be "extern". In the latter case, it also needs the DLL
// export/import specifier.
TProtoStringType qualifier;
if (!IsScoped()) {
qualifier = "extern";
if (!options_.dllexport_decl.empty()) {
qualifier = options_.dllexport_decl + " " + qualifier;
}
} else {
qualifier = "static";
}
format(
"static const int $constant_name$ = $number$;\n"
"$1$ ::$proto_ns$::internal::ExtensionIdentifier< $extendee$,\n"
" ::$proto_ns$::internal::$type_traits$, $field_type$, $packed$ >\n"
" ${2$$name$$}$;\n",
qualifier, descriptor_);
}
void ExtensionGenerator::GenerateDefinition(io::Printer* printer) {
// If we are building for lite with implicit weak fields, we want to skip over
// any custom options (i.e. extensions of messages from descriptor.proto).
// This prevents the creation of any unnecessary linker references to the
// descriptor messages.
if (options_.lite_implicit_weak_fields &&
descriptor_->containing_type()->file()->name() ==
"net/proto2/proto/descriptor.proto") {
return;
}
Formatter format(printer, variables_);
TProtoStringType default_str;
// If this is a class member, it needs to be declared in its class scope.
if (descriptor_->cpp_type() == FieldDescriptor::CPPTYPE_STRING) {
// We need to declare a global string which will contain the default value.
// We cannot declare it at class scope because that would require exposing
// it in the header which would be annoying for other reasons. So we
// replace :: with _ in the name and declare it as a global.
default_str =
StringReplace(variables_["scoped_name"], "::", "_", true) + "_default";
format("const TProtoStringType $1$($2$);\n", default_str,
DefaultValue(options_, descriptor_));
} else if (descriptor_->message_type()) {
// We have to initialize the default instance for extensions at registration
// time.
default_str =
FieldMessageTypeName(descriptor_, options_) + "::default_instance()";
} else {
default_str = DefaultValue(options_, descriptor_);
}
// Likewise, class members need to declare the field constant variable.
if (IsScoped()) {
format(
"#if !defined(_MSC_VER) || _MSC_VER >= 1900\n"
"const int $scope$$constant_name$;\n"
"#endif\n");
}
format(
"PROTOBUF_ATTRIBUTE_INIT_PRIORITY "
"::$proto_ns$::internal::ExtensionIdentifier< $extendee$,\n"
" ::$proto_ns$::internal::$type_traits$, $field_type$, $packed$ >\n"
" $scoped_name$($constant_name$, $1$);\n",
default_str);
}
} // namespace cpp
} // namespace compiler
} // namespace protobuf
} // namespace google
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