src/google/protobuf/compiler/cpp/primitive_field.cc

// 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/primitive_field.h>

#include <google/protobuf/io/printer.h>
#include <google/protobuf/wire_format.h>
#include <google/protobuf/stubs/strutil.h>
#include <google/protobuf/compiler/cpp/helpers.h>

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

using internal::WireFormatLite;

namespace {

// For encodings with fixed sizes, returns that size in bytes.  Otherwise
// returns -1.
int FixedSize(FieldDescriptor::Type type) {
  switch (type) {
    case FieldDescriptor::TYPE_INT32:
      return -1;
    case FieldDescriptor::TYPE_INT64:
      return -1;
    case FieldDescriptor::TYPE_UINT32:
      return -1;
    case FieldDescriptor::TYPE_UINT64:
      return -1;
    case FieldDescriptor::TYPE_SINT32:
      return -1;
    case FieldDescriptor::TYPE_SINT64:
      return -1;
    case FieldDescriptor::TYPE_FIXED32:
      return WireFormatLite::kFixed32Size;
    case FieldDescriptor::TYPE_FIXED64:
      return WireFormatLite::kFixed64Size;
    case FieldDescriptor::TYPE_SFIXED32:
      return WireFormatLite::kSFixed32Size;
    case FieldDescriptor::TYPE_SFIXED64:
      return WireFormatLite::kSFixed64Size;
    case FieldDescriptor::TYPE_FLOAT:
      return WireFormatLite::kFloatSize;
    case FieldDescriptor::TYPE_DOUBLE:
      return WireFormatLite::kDoubleSize;

    case FieldDescriptor::TYPE_BOOL:
      return WireFormatLite::kBoolSize;
    case FieldDescriptor::TYPE_ENUM:
      return -1;

    case FieldDescriptor::TYPE_STRING:
      return -1;
    case FieldDescriptor::TYPE_BYTES:
      return -1;
    case FieldDescriptor::TYPE_GROUP:
      return -1;
    case FieldDescriptor::TYPE_MESSAGE:
      return -1;

      // No default because we want the compiler to complain if any new
      // types are added.
  }
  GOOGLE_LOG(FATAL) << "Can't get here.";
  return -1;
}

void SetPrimitiveVariables(const FieldDescriptor* descriptor,
                           std::map<std::string, std::string>* variables,
                           const Options& options) {
  SetCommonFieldVariables(descriptor, variables, options);
  (*variables)["type"] = PrimitiveTypeName(options, descriptor->cpp_type());
  (*variables)["default"] = DefaultValue(options, descriptor);
  (*variables)["cached_byte_size_name"] = MakeVarintCachedSizeName(descriptor);
  bool cold = ShouldSplit(descriptor, options);
  (*variables)["cached_byte_size_field"] =
      MakeVarintCachedSizeFieldName(descriptor, cold);
  (*variables)["tag"] = StrCat(internal::WireFormat::MakeTag(descriptor));
  int fixed_size = FixedSize(descriptor->type());
  if (fixed_size != -1) {
    (*variables)["fixed_size"] = StrCat(fixed_size);
  }
  (*variables)["wire_format_field_type"] = FieldDescriptorProto_Type_Name(
      static_cast<FieldDescriptorProto_Type>(descriptor->type()));
  (*variables)["full_name"] = descriptor->full_name();
}

}  // namespace

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

PrimitiveFieldGenerator::PrimitiveFieldGenerator(
    const FieldDescriptor* descriptor, const Options& options)
    : FieldGenerator(descriptor, options) {
  SetPrimitiveVariables(descriptor, &variables_, options);
}

PrimitiveFieldGenerator::~PrimitiveFieldGenerator() {}

void PrimitiveFieldGenerator::GeneratePrivateMembers(
    io::Printer* printer) const {
  Formatter format(printer, variables_);
  format("$type$ $name$_;\n");
}

void PrimitiveFieldGenerator::GenerateAccessorDeclarations(
    io::Printer* printer) const {
  Formatter format(printer, variables_);
  format(
      "$deprecated_attr$$type$ ${1$$name$$}$() const;\n"
      "$deprecated_attr$void ${1$set_$name$$}$($type$ value);\n"
      "private:\n"
      "$type$ ${1$_internal_$name$$}$() const;\n"
      "void ${1$_internal_set_$name$$}$($type$ value);\n"
      "public:\n",
      descriptor_);
}

void PrimitiveFieldGenerator::GenerateInlineAccessorDefinitions(
    io::Printer* printer) const {
  Formatter format(printer, variables_);
  format(
      "inline $type$ $classname$::_internal_$name$() const {\n"
      "  return $field$;\n"
      "}\n"
      "inline $type$ $classname$::$name$() const {\n"
      "$annotate_get$"
      "  // @@protoc_insertion_point(field_get:$full_name$)\n"
      "  return _internal_$name$();\n"
      "}\n"
      "inline void $classname$::_internal_set_$name$($type$ value) {\n"
      "  $set_hasbit$\n"
      "  $field$ = value;\n"
      "}\n"
      "inline void $classname$::set_$name$($type$ value) {\n"
      "$maybe_prepare_split_message$"
      "  _internal_set_$name$(value);\n"
      "$annotate_set$"
      "  // @@protoc_insertion_point(field_set:$full_name$)\n"
      "}\n");
}

void PrimitiveFieldGenerator::GenerateClearingCode(io::Printer* printer) const {
  Formatter format(printer, variables_);
  format("$field$ = $default$;\n");
}

void PrimitiveFieldGenerator::GenerateMergingCode(io::Printer* printer) const {
  Formatter format(printer, variables_);
  format("_this->_internal_set_$name$(from._internal_$name$());\n");
}

void PrimitiveFieldGenerator::GenerateSwappingCode(io::Printer* printer) const {
  Formatter format(printer, variables_);
  format("swap($field$, other->$field$);\n");
}

void PrimitiveFieldGenerator::GenerateCopyConstructorCode(
    io::Printer* printer) const {
  Formatter format(printer, variables_);
  format("_this->$field$ = from.$field$;\n");
}

void PrimitiveFieldGenerator::GenerateSerializeWithCachedSizesToArray(
    io::Printer* printer) const {
  Formatter format(printer, variables_);
  format(
      "target = stream->EnsureSpace(target);\n"
      "target = "
      "::_pbi::WireFormatLite::Write$declared_type$ToArray("
      "$number$, this->_internal_$name$(), target);\n");
}

void PrimitiveFieldGenerator::GenerateByteSize(io::Printer* printer) const {
  Formatter format(printer, variables_);
  int fixed_size = FixedSize(descriptor_->type());
  if (fixed_size == -1) {
    if (internal::WireFormat::TagSize(descriptor_->number(),
                                      descriptor_->type()) == 1) {
      // Adding one is very common and it turns out it can be done for
      // free inside of WireFormatLite, so we can save an instruction here.
      format(
          "total_size += ::_pbi::WireFormatLite::"
          "$declared_type$SizePlusOne(this->_internal_$name$());\n");
    } else {
      format(
          "total_size += $tag_size$ +\n"
          "  ::_pbi::WireFormatLite::$declared_type$Size(\n"
          "    this->_internal_$name$());\n");
    }
  } else {
    format("total_size += $tag_size$ + $fixed_size$;\n");
  }
}

void PrimitiveFieldGenerator::GenerateConstexprAggregateInitializer(
    io::Printer* printer) const {
  Formatter format(printer, variables_);
  format("/*decltype($field$)*/$default$");
}

void PrimitiveFieldGenerator::GenerateAggregateInitializer(
    io::Printer* printer) const {
  Formatter format(printer, variables_);
  if (ShouldSplit(descriptor_, options_)) {
    format("decltype(Impl_::Split::$name$_){$default$}");
    return;
  }
  format("decltype($field$){$default$}");
}

void PrimitiveFieldGenerator::GenerateCopyAggregateInitializer(
    io::Printer* printer) const {
  Formatter format(printer, variables_);
  format("decltype($field$){}");
}

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

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

PrimitiveOneofFieldGenerator::~PrimitiveOneofFieldGenerator() {}

void PrimitiveOneofFieldGenerator::GenerateInlineAccessorDefinitions(
    io::Printer* printer) const {
  Formatter format(printer, variables_);
  format(
      "inline $type$ $classname$::_internal_$name$() const {\n"
      "  if (_internal_has_$name$()) {\n"
      "    return $field$;\n"
      "  }\n"
      "  return $default$;\n"
      "}\n"
      "inline void $classname$::_internal_set_$name$($type$ value) {\n"
      "  if (!_internal_has_$name$()) {\n"
      "    clear_$oneof_name$();\n"
      "    set_has_$name$();\n"
      "  }\n"
      "  $field$ = value;\n"
      "}\n"
      "inline $type$ $classname$::$name$() const {\n"
      "$annotate_get$"
      "  // @@protoc_insertion_point(field_get:$full_name$)\n"
      "  return _internal_$name$();\n"
      "}\n"
      "inline void $classname$::set_$name$($type$ value) {\n"
      "  _internal_set_$name$(value);\n"
      "$annotate_set$"
      "  // @@protoc_insertion_point(field_set:$full_name$)\n"
      "}\n");
}

void PrimitiveOneofFieldGenerator::GenerateClearingCode(
    io::Printer* printer) const {
  Formatter format(printer, variables_);
  format("$field$ = $default$;\n");
}

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

void PrimitiveOneofFieldGenerator::GenerateConstructorCode(
    io::Printer* printer) const {
  Formatter format(printer, variables_);
  format("$ns$::_$classname$_default_instance_.$field$ = $default$;\n");
}

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

RepeatedPrimitiveFieldGenerator::RepeatedPrimitiveFieldGenerator(
    const FieldDescriptor* descriptor, const Options& options)
    : FieldGenerator(descriptor, options) {
  SetPrimitiveVariables(descriptor, &variables_, options);

  if (descriptor->is_packed()) {
    variables_["packed_reader"] = "ReadPackedPrimitive";
    variables_["repeated_reader"] = "ReadRepeatedPrimitiveNoInline";
  } else {
    variables_["packed_reader"] = "ReadPackedPrimitiveNoInline";
    variables_["repeated_reader"] = "ReadRepeatedPrimitive";
  }
}

RepeatedPrimitiveFieldGenerator::~RepeatedPrimitiveFieldGenerator() {}

void RepeatedPrimitiveFieldGenerator::GeneratePrivateMembers(
    io::Printer* printer) const {
  Formatter format(printer, variables_);
  format("::$proto_ns$::RepeatedField< $type$ > $name$_;\n");
  if (descriptor_->is_packed() && FixedSize(descriptor_->type()) == -1 &&
      HasGeneratedMethods(descriptor_->file(), options_)) {
    format("mutable std::atomic<int> $cached_byte_size_name$;\n");
  }
}

void RepeatedPrimitiveFieldGenerator::GenerateAccessorDeclarations(
    io::Printer* printer) const {
  Formatter format(printer, variables_);
  format(
      "private:\n"
      "$type$ ${1$_internal_$name$$}$(int index) const;\n"
      "const ::$proto_ns$::RepeatedField< $type$ >&\n"
      "    ${1$_internal_$name$$}$() const;\n"
      "void ${1$_internal_add_$name$$}$($type$ value);\n"
      "::$proto_ns$::RepeatedField< $type$ >*\n"
      "    ${1$_internal_mutable_$name$$}$();\n"
      "public:\n"
      "$deprecated_attr$$type$ ${1$$name$$}$(int index) const;\n"
      "$deprecated_attr$void ${1$set_$name$$}$(int index, $type$ value);\n"
      "$deprecated_attr$void ${1$add_$name$$}$($type$ value);\n"
      "$deprecated_attr$const ::$proto_ns$::RepeatedField< $type$ >&\n"
      "    ${1$$name$$}$() const;\n"
      "$deprecated_attr$::$proto_ns$::RepeatedField< $type$ >*\n"
      "    ${1$mutable_$name$$}$();\n",
      descriptor_);
}

void RepeatedPrimitiveFieldGenerator::GenerateInlineAccessorDefinitions(
    io::Printer* printer) const {
  Formatter format(printer, variables_);
  format(
      "inline $type$ $classname$::_internal_$name$(int index) const {\n"
      "  return $field$.Get(index);\n"
      "}\n"
      "inline $type$ $classname$::$name$(int index) const {\n"
      "$annotate_get$"
      "  // @@protoc_insertion_point(field_get:$full_name$)\n"
      "  return _internal_$name$(index);\n"
      "}\n"
      "inline void $classname$::set_$name$(int index, $type$ value) {\n"
      "$annotate_set$"
      "  $field$.Set(index, value);\n"
      "  // @@protoc_insertion_point(field_set:$full_name$)\n"
      "}\n"
      "inline void $classname$::_internal_add_$name$($type$ value) {\n"
      "  $field$.Add(value);\n"
      "}\n"
      "inline void $classname$::add_$name$($type$ value) {\n"
      "  _internal_add_$name$(value);\n"
      "$annotate_add$"
      "  // @@protoc_insertion_point(field_add:$full_name$)\n"
      "}\n"
      "inline const ::$proto_ns$::RepeatedField< $type$ >&\n"
      "$classname$::_internal_$name$() const {\n"
      "  return $field$;\n"
      "}\n"
      "inline const ::$proto_ns$::RepeatedField< $type$ >&\n"
      "$classname$::$name$() const {\n"
      "$annotate_list$"
      "  // @@protoc_insertion_point(field_list:$full_name$)\n"
      "  return _internal_$name$();\n"
      "}\n"
      "inline ::$proto_ns$::RepeatedField< $type$ >*\n"
      "$classname$::_internal_mutable_$name$() {\n"
      "  return &$field$;\n"
      "}\n"
      "inline ::$proto_ns$::RepeatedField< $type$ >*\n"
      "$classname$::mutable_$name$() {\n"
      "$annotate_mutable_list$"
      "  // @@protoc_insertion_point(field_mutable_list:$full_name$)\n"
      "  return _internal_mutable_$name$();\n"
      "}\n");
}

void RepeatedPrimitiveFieldGenerator::GenerateClearingCode(
    io::Printer* printer) const {
  Formatter format(printer, variables_);
  format("$field$.Clear();\n");
}

void RepeatedPrimitiveFieldGenerator::GenerateMergingCode(
    io::Printer* printer) const {
  Formatter format(printer, variables_);
  format("_this->$field$.MergeFrom(from.$field$);\n");
}

void RepeatedPrimitiveFieldGenerator::GenerateSwappingCode(
    io::Printer* printer) const {
  Formatter format(printer, variables_);
  format("$field$.InternalSwap(&other->$field$);\n");
}

void RepeatedPrimitiveFieldGenerator::GenerateDestructorCode(
    io::Printer* printer) const {
  Formatter format(printer, variables_);
  format("$field$.~RepeatedField();\n");
}

void RepeatedPrimitiveFieldGenerator::GenerateSerializeWithCachedSizesToArray(
    io::Printer* printer) const {
  Formatter format(printer, variables_);
  if (descriptor_->is_packed()) {
    if (FixedSize(descriptor_->type()) == -1) {
      format(
          "{\n"
          "  int byte_size = "
          "$cached_byte_size_field$.load(std::memory_order_relaxed);\n"
          "  if (byte_size > 0) {\n"
          "    target = stream->Write$declared_type$Packed(\n"
          "        $number$, _internal_$name$(), byte_size, target);\n"
          "  }\n"
          "}\n");
    } else {
      format(
          "if (this->_internal_$name$_size() > 0) {\n"
          "  target = stream->WriteFixedPacked($number$, _internal_$name$(), "
          "target);\n"
          "}\n");
    }
  } else {
    format(
        "for (int i = 0, n = this->_internal_$name$_size(); i < n; i++) {\n"
        "  target = stream->EnsureSpace(target);\n"
        "  target = ::_pbi::WireFormatLite::"
        "Write$declared_type$ToArray($number$, this->_internal_$name$(i), "
        "target);\n"
        "}\n");
  }
}

void RepeatedPrimitiveFieldGenerator::GenerateByteSize(
    io::Printer* printer) const {
  Formatter format(printer, variables_);
  format("{\n");
  format.Indent();
  int fixed_size = FixedSize(descriptor_->type());
  if (fixed_size == -1) {
    format(
        "size_t data_size = ::_pbi::WireFormatLite::\n"
        "  $declared_type$Size(this->$field$);\n");
  } else {
    format(
        "unsigned int count = static_cast<unsigned "
        "int>(this->_internal_$name$_size());\n"
        "size_t data_size = $fixed_size$UL * count;\n");
  }

  if (descriptor_->is_packed()) {
    format(
        "if (data_size > 0) {\n"
        "  total_size += $tag_size$ +\n"
        "    "
        "::_pbi::WireFormatLite::Int32Size(static_cast<$int32$>(data_size));\n"
        "}\n");
    if (FixedSize(descriptor_->type()) == -1) {
      format(
          "int cached_size = ::_pbi::ToCachedSize(data_size);\n"
          "$cached_byte_size_field$.store(cached_size,\n"
          "                                std::memory_order_relaxed);\n");
    }
    format("total_size += data_size;\n");
  } else {
    format(
        "total_size += $tag_size$ *\n"
        "              "
        "::_pbi::FromIntSize(this->_internal_$name$_size());\n"
        "total_size += data_size;\n");
  }
  format.Outdent();
  format("}\n");
}

void RepeatedPrimitiveFieldGenerator::GenerateConstexprAggregateInitializer(
    io::Printer* printer) const {
  Formatter format(printer, variables_);
  format("/*decltype($field$)*/{}");
  if (descriptor_->is_packed() && FixedSize(descriptor_->type()) == -1 &&
      HasGeneratedMethods(descriptor_->file(), options_)) {
    format("\n, /*decltype($cached_byte_size_field$)*/{0}");
  }
}

void RepeatedPrimitiveFieldGenerator::GenerateAggregateInitializer(
    io::Printer* printer) const {
  Formatter format(printer, variables_);
  format("decltype($field$){arena}");
  if (descriptor_->is_packed() && FixedSize(descriptor_->type()) == -1 &&
      HasGeneratedMethods(descriptor_->file(), options_)) {
    // std::atomic has no move constructor, which prevents explicit aggregate
    // initialization pre-C++17.
    format("\n, /*decltype($cached_byte_size_field$)*/{0}");
  }
}

void RepeatedPrimitiveFieldGenerator::GenerateCopyAggregateInitializer(
    io::Printer* printer) const {

  Formatter format(printer, variables_);
  format("decltype($field$){from.$field$}");
  if (descriptor_->is_packed() && FixedSize(descriptor_->type()) == -1 &&
      HasGeneratedMethods(descriptor_->file(), options_)) {
    // std::atomic has no move constructor.
    format("\n, /*decltype($cached_byte_size_field$)*/{0}");
  }
}

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