compiler/cpp/cpp_message_field.cc

// Protocol Buffers - Google's data interchange format
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// https://developers.google.com/protocol-buffers/
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//     * Redistributions of source code must retain the above copyright
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// 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_message_field.h>
#include <google/protobuf/compiler/cpp/cpp_helpers.h>
#include <google/protobuf/io/printer.h>
#include <google/protobuf/stubs/strutil.h>

namespace google {
namespace protobuf {
namespace compiler {
namespace cpp {

namespace {

void SetMessageVariables(const FieldDescriptor* descriptor,
                         map<string, string>* variables,
                         const Options& options) {
  SetCommonFieldVariables(descriptor, variables, options);
  (*variables)["type"] = FieldMessageTypeName(descriptor);
  (*variables)["stream_writer"] = (*variables)["declared_type"] +
      (HasFastArraySerialization(descriptor->message_type()->file()) ?
       "MaybeToArray" :
       "");
  // NOTE: Escaped here to unblock proto1->proto2 migration.
  // TODO(liujisi): Extend this to apply for other conflicting methods.
  (*variables)["release_name"] =
      SafeFunctionName(descriptor->containing_type(),
                       descriptor, "release_");
  (*variables)["full_name"] = descriptor->full_name();
}

}  // namespace

// ===================================================================

MessageFieldGenerator::
MessageFieldGenerator(const FieldDescriptor* descriptor,
                      const Options& options)
  : descriptor_(descriptor) {
  SetMessageVariables(descriptor, &variables_, options);
}

MessageFieldGenerator::~MessageFieldGenerator() {}

void MessageFieldGenerator::
GeneratePrivateMembers(io::Printer* printer) const {
  printer->Print(variables_, "$type$* $name$_;\n");
}

void MessageFieldGenerator::
GenerateAccessorDeclarations(io::Printer* printer) const {
  printer->Print(variables_,
    "inline const $type$& $name$() const$deprecation$;\n"
    "inline $type$* mutable_$name$()$deprecation$;\n"
    "inline $type$* $release_name$()$deprecation$;\n"
    "inline void set_allocated_$name$($type$* $name$)$deprecation$;\n");
}

void MessageFieldGenerator::
GenerateInlineAccessorDefinitions(io::Printer* printer) const {
  printer->Print(variables_,
    "inline const $type$& $classname$::$name$() const {\n"
    "  // @@protoc_insertion_point(field_get:$full_name$)\n");

  PrintHandlingOptionalStaticInitializers(
    variables_, descriptor_->file(), printer,
    // With static initializers.
    "  return $name$_ != NULL ? *$name$_ : *default_instance_->$name$_;\n",
    // Without.
    "  return $name$_ != NULL ? *$name$_ : *default_instance().$name$_;\n");

  printer->Print(variables_,
    "}\n"
    "inline $type$* $classname$::mutable_$name$() {\n"
    "  set_has_$name$();\n"
    "  if ($name$_ == NULL) $name$_ = new $type$;\n"
    "  // @@protoc_insertion_point(field_mutable:$full_name$)\n"
    "  return $name$_;\n"
    "}\n"
    "inline $type$* $classname$::$release_name$() {\n"
    "  clear_has_$name$();\n"
    "  $type$* temp = $name$_;\n"
    "  $name$_ = NULL;\n"
    "  return temp;\n"
    "}\n"
    "inline void $classname$::set_allocated_$name$($type$* $name$) {\n"
    "  delete $name$_;\n"
    "  $name$_ = $name$;\n"
    "  if ($name$) {\n"
    "    set_has_$name$();\n"
    "  } else {\n"
    "    clear_has_$name$();\n"
    "  }\n"
    "  // @@protoc_insertion_point(field_set_allocated:$full_name$)\n"
    "}\n");
}

void MessageFieldGenerator::
GenerateClearingCode(io::Printer* printer) const {
  printer->Print(variables_,
    "if ($name$_ != NULL) $name$_->$type$::Clear();\n");
}

void MessageFieldGenerator::
GenerateMergingCode(io::Printer* printer) const {
  printer->Print(variables_,
    "mutable_$name$()->$type$::MergeFrom(from.$name$());\n");
}

void MessageFieldGenerator::
GenerateSwappingCode(io::Printer* printer) const {
  printer->Print(variables_, "std::swap($name$_, other->$name$_);\n");
}

void MessageFieldGenerator::
GenerateConstructorCode(io::Printer* printer) const {
  printer->Print(variables_, "$name$_ = NULL;\n");
}

void MessageFieldGenerator::
GenerateMergeFromCodedStream(io::Printer* printer) const {
  if (descriptor_->type() == FieldDescriptor::TYPE_MESSAGE) {
    printer->Print(variables_,
      "DO_(::google::protobuf::internal::WireFormatLite::ReadMessageNoVirtual(\n"
      "     input, mutable_$name$()));\n");
  } else {
    printer->Print(variables_,
      "DO_(::google::protobuf::internal::WireFormatLite::ReadGroupNoVirtual(\n"
      "      $number$, input, mutable_$name$()));\n");
  }
}

void MessageFieldGenerator::
GenerateSerializeWithCachedSizes(io::Printer* printer) const {
  printer->Print(variables_,
    "::google::protobuf::internal::WireFormatLite::Write$stream_writer$(\n"
    "  $number$, this->$name$(), output);\n");
}

void MessageFieldGenerator::
GenerateSerializeWithCachedSizesToArray(io::Printer* printer) const {
  printer->Print(variables_,
    "target = ::google::protobuf::internal::WireFormatLite::\n"
    "  Write$declared_type$NoVirtualToArray(\n"
    "    $number$, this->$name$(), target);\n");
}

void MessageFieldGenerator::
GenerateByteSize(io::Printer* printer) const {
  printer->Print(variables_,
    "total_size += $tag_size$ +\n"
    "  ::google::protobuf::internal::WireFormatLite::$declared_type$SizeNoVirtual(\n"
    "    this->$name$());\n");
}

// ===================================================================

MessageOneofFieldGenerator::
MessageOneofFieldGenerator(const FieldDescriptor* descriptor,
                           const Options& options)
  : MessageFieldGenerator(descriptor, options) {
  SetCommonOneofFieldVariables(descriptor, &variables_);
}

MessageOneofFieldGenerator::~MessageOneofFieldGenerator() {}

void MessageOneofFieldGenerator::
GenerateInlineAccessorDefinitions(io::Printer* printer) const {
  printer->Print(variables_,
    "inline const $type$& $classname$::$name$() const {\n"
    "  return has_$name$() ? *$oneof_prefix$$name$_\n"
    "                      : $type$::default_instance();\n"
    "}\n"
    "inline $type$* $classname$::mutable_$name$() {\n"
    "  if (!has_$name$()) {\n"
    "    clear_$oneof_name$();\n"
    "    set_has_$name$();\n"
    "    $oneof_prefix$$name$_ = new $type$;\n"
    "  }\n"
    "  return $oneof_prefix$$name$_;\n"
    "}\n"
    "inline $type$* $classname$::$release_name$() {\n"
    "  if (has_$name$()) {\n"
    "    clear_has_$oneof_name$();\n"
    "    $type$* temp = $oneof_prefix$$name$_;\n"
    "    $oneof_prefix$$name$_ = NULL;\n"
    "    return temp;\n"
    "  } else {\n"
    "    return NULL;\n"
    "  }\n"
    "}\n"
    "inline void $classname$::set_allocated_$name$($type$* $name$) {\n"
    "  clear_$oneof_name$();\n"
    "  if ($name$) {\n"
    "    set_has_$name$();\n"
    "    $oneof_prefix$$name$_ = $name$;\n"
    "  }\n"
    "}\n");
}

void MessageOneofFieldGenerator::
GenerateClearingCode(io::Printer* printer) const {
  // if it is the active field, it cannot be NULL.
  printer->Print(variables_,
    "delete $oneof_prefix$$name$_;\n");
}

void MessageOneofFieldGenerator::
GenerateSwappingCode(io::Printer* printer) const {
  // Don't print any swapping code. Swapping the union will swap this field.
}

void MessageOneofFieldGenerator::
GenerateConstructorCode(io::Printer* printer) const {
  // Don't print any constructor code. The field is in a union. We allocate
  // space only when this field is used.
}

// ===================================================================

RepeatedMessageFieldGenerator::
RepeatedMessageFieldGenerator(const FieldDescriptor* descriptor,
                              const Options& options)
  : descriptor_(descriptor) {
  SetMessageVariables(descriptor, &variables_, options);
}

RepeatedMessageFieldGenerator::~RepeatedMessageFieldGenerator() {}

void RepeatedMessageFieldGenerator::
GeneratePrivateMembers(io::Printer* printer) const {
  printer->Print(variables_,
    "::google::protobuf::RepeatedPtrField< $type$ > $name$_;\n");
}

void RepeatedMessageFieldGenerator::
GenerateAccessorDeclarations(io::Printer* printer) const {
  printer->Print(variables_,
    "inline const $type$& $name$(int index) const$deprecation$;\n"
    "inline $type$* mutable_$name$(int index)$deprecation$;\n"
    "inline $type$* add_$name$()$deprecation$;\n");
  printer->Print(variables_,
    "inline const ::google::protobuf::RepeatedPtrField< $type$ >&\n"
    "    $name$() const$deprecation$;\n"
    "inline ::google::protobuf::RepeatedPtrField< $type$ >*\n"
    "    mutable_$name$()$deprecation$;\n");
}

void RepeatedMessageFieldGenerator::
GenerateInlineAccessorDefinitions(io::Printer* printer) const {
  printer->Print(variables_,
    "inline const $type$& $classname$::$name$(int index) const {\n"
    "  // @@protoc_insertion_point(field_get:$full_name$)\n"
    "  return $name$_.$cppget$(index);\n"
    "}\n"
    "inline $type$* $classname$::mutable_$name$(int index) {\n"
    "  // @@protoc_insertion_point(field_mutable:$full_name$)\n"
    "  return $name$_.Mutable(index);\n"
    "}\n"
    "inline $type$* $classname$::add_$name$() {\n"
    "  // @@protoc_insertion_point(field_add:$full_name$)\n"
    "  return $name$_.Add();\n"
    "}\n");
  printer->Print(variables_,
    "inline const ::google::protobuf::RepeatedPtrField< $type$ >&\n"
    "$classname$::$name$() const {\n"
    "  // @@protoc_insertion_point(field_list:$full_name$)\n"
    "  return $name$_;\n"
    "}\n"
    "inline ::google::protobuf::RepeatedPtrField< $type$ >*\n"
    "$classname$::mutable_$name$() {\n"
    "  // @@protoc_insertion_point(field_mutable_list:$full_name$)\n"
    "  return &$name$_;\n"
    "}\n");
}

void RepeatedMessageFieldGenerator::
GenerateClearingCode(io::Printer* printer) const {
  printer->Print(variables_, "$name$_.Clear();\n");
}

void RepeatedMessageFieldGenerator::
GenerateMergingCode(io::Printer* printer) const {
  printer->Print(variables_, "$name$_.MergeFrom(from.$name$_);\n");
}

void RepeatedMessageFieldGenerator::
GenerateSwappingCode(io::Printer* printer) const {
  printer->Print(variables_, "$name$_.Swap(&other->$name$_);\n");
}

void RepeatedMessageFieldGenerator::
GenerateConstructorCode(io::Printer* printer) const {
  // Not needed for repeated fields.
}

void RepeatedMessageFieldGenerator::
GenerateMergeFromCodedStream(io::Printer* printer) const {
  if (descriptor_->type() == FieldDescriptor::TYPE_MESSAGE) {
    printer->Print(variables_,
      "DO_(::google::protobuf::internal::WireFormatLite::ReadMessageNoVirtual(\n"
      "      input, add_$name$()));\n");
  } else {
    printer->Print(variables_,
      "DO_(::google::protobuf::internal::WireFormatLite::ReadGroupNoVirtual(\n"
      "      $number$, input, add_$name$()));\n");
  }
}

void RepeatedMessageFieldGenerator::
GenerateSerializeWithCachedSizes(io::Printer* printer) const {
  printer->Print(variables_,
    "for (int i = 0; i < this->$name$_size(); i++) {\n"
    "  ::google::protobuf::internal::WireFormatLite::Write$stream_writer$(\n"
    "    $number$, this->$name$(i), output);\n"
    "}\n");
}

void RepeatedMessageFieldGenerator::
GenerateSerializeWithCachedSizesToArray(io::Printer* printer) const {
  printer->Print(variables_,
    "for (int i = 0; i < this->$name$_size(); i++) {\n"
    "  target = ::google::protobuf::internal::WireFormatLite::\n"
    "    Write$declared_type$NoVirtualToArray(\n"
    "      $number$, this->$name$(i), target);\n"
    "}\n");
}

void RepeatedMessageFieldGenerator::
GenerateByteSize(io::Printer* printer) const {
  printer->Print(variables_,
    "total_size += $tag_size$ * this->$name$_size();\n"
    "for (int i = 0; i < this->$name$_size(); i++) {\n"
    "  total_size +=\n"
    "    ::google::protobuf::internal::WireFormatLite::$declared_type$SizeNoVirtual(\n"
    "      this->$name$(i));\n"
    "}\n");
}

}  // namespace cpp
}  // namespace compiler
}  // namespace protobuf
}  // namespace google