ipc/glue/ScopedPort.cpp

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #include "mozilla/ipc/ScopedPort.h"
   8 #include "mozilla/ipc/NodeController.h"
   9 #include "chrome/common/ipc_message_utils.h"
  10
  11 namespace mozilla::ipc {
  12
  13 void ScopedPort::Reset() {
  14   if (mValid) {
  15     mController->ClosePort(mPort);
  16   }
  17   mValid = false;
  18   mPort = {};
  19   mController = nullptr;
  20 }
  21
  22 auto ScopedPort::Release() -> PortRef {
  23   if (!mValid) {
  24     return {};
  25   }
  26   mValid = false;
  27   mController = nullptr;
  28   return std::exchange(mPort, PortRef{});
  29 }
  30
  31 ScopedPort::ScopedPort() = default;
  32
  33 ScopedPort::~ScopedPort() { Reset(); }
  34
  35 ScopedPort::ScopedPort(PortRef aPort, NodeController* aController)
  36     : mValid(true), mPort(std::move(aPort)), mController(aController) {
  37   MOZ_ASSERT(mPort.is_valid() && mController);
  38 }
  39
  40 ScopedPort::ScopedPort(ScopedPort&& aOther)
  41     : mValid(std::exchange(aOther.mValid, false)),
  42       mPort(std::move(aOther.mPort)),
  43       mController(std::move(aOther.mController)) {}
  44
  45 ScopedPort& ScopedPort::operator=(ScopedPort&& aOther) {
  46   if (this != &aOther) {
  47     Reset();
  48     mValid = std::exchange(aOther.mValid, false);
  49     mPort = std::move(aOther.mPort);
  50     mController = std::move(aOther.mController);
  51   }
  52   return *this;
  53 }
  54
  55 }  // namespace mozilla::ipc
  56
  57 void IPC::ParamTraits<mozilla::ipc::ScopedPort>::Write(MessageWriter* aWriter,
  58                                                        paramType&& aParam) {
  59   aWriter->WriteBool(aParam.IsValid());
  60   if (!aParam.IsValid()) {
  61     return;
  62   }
  63   aWriter->WritePort(std::move(aParam));
  64 }
  65
  66 bool IPC::ParamTraits<mozilla::ipc::ScopedPort>::Read(MessageReader* aReader,
  67                                                       paramType* aResult) {
  68   bool isValid = false;
  69   if (!aReader->ReadBool(&isValid)) {
  70     return false;
  71   }
  72   if (!isValid) {
  73     *aResult = {};
  74     return true;
  75   }
  76   return aReader->ConsumePort(aResult);
  77 }