widget/nsAutoRollup.cpp
author David Major <dmajor@mozilla.com>
Thu, 17 Jan 2019 21:59:06 -0500
changeset 454407 e0f21f574d36309f94a832c8985223e4b46a0dd2
parent 448947 6f3709b3878117466168c40affa7bca0b60cf75b
child 461907 0707c5d273227aed4fb04a8f6360875165f83ddd
permissions -rw-r--r--
Bug 1520880: Silence an unused variable warning in the stubbed-out ARM64 interceptor. r=aklotz

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "mozilla/widget/nsAutoRollup.h"

namespace mozilla {
namespace widget {

/*static*/ uint32_t nsAutoRollup::sCount = 0;
/*static*/ StaticRefPtr<nsIContent> nsAutoRollup::sLastRollup;

nsAutoRollup::nsAutoRollup() {
  // remember if sLastRollup was null, and only clear it upon destruction
  // if so. This prevents recursive usage of nsAutoRollup from clearing
  // sLastRollup when it shouldn't.
  mWasClear = !sLastRollup;
  sCount++;
}

nsAutoRollup::nsAutoRollup(nsIContent* aRollup) {
  MOZ_ASSERT(!sLastRollup);
  mWasClear = true;
  sCount++;
  SetLastRollup(aRollup);
}

nsAutoRollup::~nsAutoRollup() {
  if (sLastRollup && mWasClear) {
    sLastRollup = nullptr;
  }
  sCount--;
}

/*static*/ void nsAutoRollup::SetLastRollup(nsIContent* aLastRollup) {
  // There must be at least one nsAutoRollup on the stack.
  MOZ_ASSERT(sCount);

  sLastRollup = aLastRollup;
}

/*static*/ nsIContent* nsAutoRollup::GetLastRollup() {
  return sLastRollup.get();
}

}  // namespace widget
}  // namespace mozilla