Adding upstream version 115.8.0esr.upstream/115.8.0esr

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1346 insertions, 0 deletions

diff --git a/accessible/ipc/DocAccessibleParent.cpp b/accessible/ipc/DocAccessibleParent.cpp
new file mode 100644
index 0000000000..eac395e700
--- /dev/null
+++ b/accessible/ipc/DocAccessibleParent.cpp
@@ -0,0 +1,1346 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=2 et sw=2 tw=80: */
+/* 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 "ARIAMap.h"
+#include "CachedTableAccessible.h"
+#include "DocAccessibleParent.h"
+#include "mozilla/a11y/Platform.h"
+#include "mozilla/Components.h"  // for mozilla::components
+#include "mozilla/dom/BrowserBridgeParent.h"
+#include "mozilla/dom/BrowserParent.h"
+#include "mozilla/dom/CanonicalBrowsingContext.h"
+#include "nsAccessibilityService.h"
+#include "xpcAccessibleDocument.h"
+#include "xpcAccEvents.h"
+#include "nsAccUtils.h"
+#include "nsIIOService.h"
+#include "TextRange.h"
+#include "Relation.h"
+#include "RootAccessible.h"
+
+#if defined(XP_WIN)
+#  include "Compatibility.h"
+#  include "nsWinUtils.h"
+#else
+#  include "mozilla/a11y/DocAccessiblePlatformExtParent.h"
+#endif
+
+#if defined(ANDROID)
+#  include "mozilla/a11y/SessionAccessibility.h"
+#  define ACQUIRE_ANDROID_LOCK \
+    MonitorAutoLock mal(nsAccessibilityService::GetAndroidMonitor());
+#else
+#  define ACQUIRE_ANDROID_LOCK \
+    do {                       \
+    } while (0);
+#endif
+
+namespace mozilla {
+
+namespace a11y {
+uint64_t DocAccessibleParent::sMaxDocID = 0;
+
+DocAccessibleParent::DocAccessibleParent()
+    : RemoteAccessible(this),
+      mParentDoc(kNoParentDoc),
+#if defined(XP_WIN)
+      mEmulatedWindowHandle(nullptr),
+#endif  // defined(XP_WIN)
+      mTopLevel(false),
+      mTopLevelInContentProcess(false),
+      mShutdown(false),
+      mFocus(0),
+      mCaretId(0),
+      mCaretOffset(-1),
+      mIsCaretAtEndOfLine(false) {
+  sMaxDocID++;
+  mActorID = sMaxDocID;
+  MOZ_ASSERT(!LiveDocs().Get(mActorID));
+  LiveDocs().InsertOrUpdate(mActorID, this);
+}
+
+DocAccessibleParent::~DocAccessibleParent() {
+  UnregisterWeakMemoryReporter(this);
+  LiveDocs().Remove(mActorID);
+  MOZ_ASSERT(mChildDocs.Length() == 0);
+  MOZ_ASSERT(!ParentDoc());
+}
+
+already_AddRefed<DocAccessibleParent> DocAccessibleParent::New() {
+  RefPtr<DocAccessibleParent> dap(new DocAccessibleParent());
+  // We need to do this with a non-zero reference count.  The easiest way is to
+  // do it in this static method and hide the constructor.
+  RegisterWeakMemoryReporter(dap);
+  return dap.forget();
+}
+
+void DocAccessibleParent::SetBrowsingContext(
+    dom::CanonicalBrowsingContext* aBrowsingContext) {
+  mBrowsingContext = aBrowsingContext;
+}
+
+mozilla::ipc::IPCResult DocAccessibleParent::RecvShowEvent(
+    nsTArray<AccessibleData>&& aNewTree, const bool& aEventSuppressed,
+    const bool& aComplete, const bool& aFromUser) {
+  ACQUIRE_ANDROID_LOCK
+  if (mShutdown) return IPC_OK();
+
+  MOZ_ASSERT(CheckDocTree());
+
+  if (aNewTree.IsEmpty()) {
+    return IPC_FAIL(this, "No children being added");
+  }
+
+  RemoteAccessible* root = nullptr;
+  RemoteAccessible* rootParent = nullptr;
+  RemoteAccessible* lastParent = this;
+  uint64_t lastParentID = 0;
+  for (const auto& accData : aNewTree) {
+    RemoteAccessible* parent = accData.ParentID() == lastParentID
+                                   ? lastParent
+                                   : GetAccessible(accData.ParentID());
+    // XXX This should really never happen, but sometimes we fail to fire the
+    // required show events.
+    if (!parent) {
+      NS_ERROR("adding child to unknown accessible");
+#ifdef DEBUG
+      return IPC_FAIL(this, "unknown parent accessible");
+#else
+      return IPC_OK();
+#endif
+    }
+
+    uint32_t childIdx = accData.IndexInParent();
+    if (childIdx > parent->ChildCount()) {
+      NS_ERROR("invalid index to add child at");
+#ifdef DEBUG
+      return IPC_FAIL(this, "invalid index");
+#else
+      return IPC_OK();
+#endif
+    }
+
+    RemoteAccessible* child = CreateAcc(accData);
+    if (!child) {
+      // This shouldn't happen.
+      return IPC_FAIL(this, "failed to add children");
+    }
+    if (!root && !mPendingShowChild) {
+      // This is the first Accessible, which is the root of the shown subtree.
+      root = child;
+      rootParent = parent;
+    }
+    // If this show event has been split across multiple messages and this is
+    // not the last message, don't attach the shown root to the tree yet.
+    // Otherwise, clients might crawl the incomplete subtree and they won't get
+    // mutation events for the remaining pieces.
+    if (aComplete || root != child) {
+      AttachChild(parent, childIdx, child);
+    }
+  }
+
+  MOZ_ASSERT(CheckDocTree());
+
+  if (!aComplete && !mPendingShowChild) {
+    // This is the first message for a show event split across multiple
+    // messages. Save the show target for subsequent messages and return.
+    const auto& accData = aNewTree[0];
+    mPendingShowChild = accData.ID();
+    mPendingShowParent = accData.ParentID();
+    mPendingShowIndex = accData.IndexInParent();
+    return IPC_OK();
+  }
+  if (!aComplete) {
+    // This show event has been split into multiple messages, but this is
+    // neither the first nor the last message. There's nothing more to do here.
+    return IPC_OK();
+  }
+  MOZ_ASSERT(aComplete);
+  if (mPendingShowChild) {
+    // This is the last message for a show event split across multiple
+    // messages. Retrieve the saved show target, attach it to the tree and fire
+    // an event if appropriate.
+    rootParent = GetAccessible(mPendingShowParent);
+    MOZ_ASSERT(rootParent);
+    root = GetAccessible(mPendingShowChild);
+    MOZ_ASSERT(root);
+    AttachChild(rootParent, mPendingShowIndex, root);
+    mPendingShowChild = 0;
+    mPendingShowParent = 0;
+    mPendingShowIndex = 0;
+  }
+
+  // Just update, no events.
+  if (aEventSuppressed) {
+    return IPC_OK();
+  }
+
+  ProxyShowHideEvent(root, rootParent, true, aFromUser);
+
+  if (nsCOMPtr<nsIObserverService> obsService =
+          services::GetObserverService()) {
+    obsService->NotifyObservers(nullptr, NS_ACCESSIBLE_CACHE_TOPIC, nullptr);
+  }
+
+  if (!nsCoreUtils::AccEventObserversExist()) {
+    return IPC_OK();
+  }
+
+  uint32_t type = nsIAccessibleEvent::EVENT_SHOW;
+  xpcAccessibleGeneric* xpcAcc = GetXPCAccessible(root);
+  xpcAccessibleDocument* doc = GetAccService()->GetXPCDocument(this);
+  nsINode* node = nullptr;
+  RefPtr<xpcAccEvent> event =
+      new xpcAccEvent(type, xpcAcc, doc, node, aFromUser);
+  nsCoreUtils::DispatchAccEvent(std::move(event));
+
+  return IPC_OK();
+}
+
+RemoteAccessible* DocAccessibleParent::CreateAcc(
+    const AccessibleData& aAccData) {
+  RemoteAccessible* newProxy;
+  if ((newProxy = GetAccessible(aAccData.ID()))) {
+    // This is a move. Reuse the Accessible; don't destroy it.
+    MOZ_ASSERT(!newProxy->RemoteParent());
+    return newProxy;
+  }
+
+  if (!aria::IsRoleMapIndexValid(aAccData.RoleMapEntryIndex())) {
+    MOZ_ASSERT_UNREACHABLE("Invalid role map entry index");
+    return nullptr;
+  }
+
+  newProxy = new RemoteAccessible(aAccData.ID(), this, aAccData.Role(),
+                                  aAccData.Type(), aAccData.GenericTypes(),
+                                  aAccData.RoleMapEntryIndex());
+  mAccessibles.PutEntry(aAccData.ID())->mProxy = newProxy;
+
+  if (RefPtr<AccAttributes> fields = aAccData.CacheFields()) {
+    newProxy->ApplyCache(CacheUpdateType::Initial, fields);
+  }
+
+  return newProxy;
+}
+
+void DocAccessibleParent::AttachChild(RemoteAccessible* aParent,
+                                      uint32_t aIndex,
+                                      RemoteAccessible* aChild) {
+  aParent->AddChildAt(aIndex, aChild);
+  aChild->SetParent(aParent);
+  // ProxyCreated might have already been called if aChild is being moved.
+  if (!aChild->GetWrapper()) {
+    ProxyCreated(aChild);
+  }
+  if (aChild->IsTableCell()) {
+    CachedTableAccessible::Invalidate(aChild);
+  }
+  if (aChild->IsOuterDoc()) {
+    // We can only do this after ProxyCreated is called because it will fire an
+    // event on aChild.
+    mPendingOOPChildDocs.RemoveIf([&](dom::BrowserBridgeParent* bridge) {
+      MOZ_ASSERT(bridge->GetBrowserParent(),
+                 "Pending BrowserBridgeParent should be alive");
+      if (bridge->GetEmbedderAccessibleId() != aChild->ID()) {
+        return false;
+      }
+      MOZ_ASSERT(bridge->GetEmbedderAccessibleDoc() == this);
+      if (DocAccessibleParent* childDoc = bridge->GetDocAccessibleParent()) {
+        AddChildDoc(childDoc, aChild->ID(), false);
+      }
+      return true;
+    });
+  }
+}
+
+void DocAccessibleParent::ShutdownOrPrepareForMove(RemoteAccessible* aAcc) {
+  uint64_t id = aAcc->ID();
+  if (!mMovingIDs.Contains(id)) {
+    // This Accessible is being removed.
+    aAcc->Shutdown();
+    return;
+  }
+  // This is a move. Moves are sent as a hide and then a show, but for a move,
+  // we want to keep the Accessible alive for reuse later.
+  if (aAcc->IsTable() || aAcc->IsTableCell()) {
+    // For table cells, it's important that we do this before the parent is
+    // cleared because CachedTableAccessible::Invalidate needs the ancestry.
+    CachedTableAccessible::Invalidate(aAcc);
+  }
+  if (aAcc->IsHyperText()) {
+    aAcc->InvalidateCachedHyperTextOffsets();
+  }
+  aAcc->SetParent(nullptr);
+  mMovingIDs.EnsureRemoved(id);
+  if (aAcc->IsOuterDoc()) {
+    // Leave child documents alone. They are added and removed differently to
+    // normal children.
+    return;
+  }
+  // Some children might be removed. Handle children the same way.
+  for (RemoteAccessible* child : aAcc->mChildren) {
+    ShutdownOrPrepareForMove(child);
+  }
+  // Even if some children are kept, those will be re-attached when we handle
+  // the show event. For now, clear all of them.
+  aAcc->mChildren.Clear();
+}
+
+mozilla::ipc::IPCResult DocAccessibleParent::RecvHideEvent(
+    const uint64_t& aRootID, const bool& aFromUser) {
+  ACQUIRE_ANDROID_LOCK
+  if (mShutdown) return IPC_OK();
+
+  MOZ_ASSERT(CheckDocTree());
+
+  // We shouldn't actually need this because mAccessibles shouldn't have an
+  // entry for the document itself, but it doesn't hurt to be explicit.
+  if (!aRootID) {
+    return IPC_FAIL(this, "Trying to hide entire document?");
+  }
+
+  ProxyEntry* rootEntry = mAccessibles.GetEntry(aRootID);
+  if (!rootEntry) {
+    NS_ERROR("invalid root being removed!");
+    return IPC_OK();
+  }
+
+  RemoteAccessible* root = rootEntry->mProxy;
+  if (!root) {
+    NS_ERROR("invalid root being removed!");
+    return IPC_OK();
+  }
+
+  RemoteAccessible* parent = root->RemoteParent();
+  ProxyShowHideEvent(root, parent, false, aFromUser);
+
+  RefPtr<xpcAccHideEvent> event = nullptr;
+  if (nsCoreUtils::AccEventObserversExist()) {
+    uint32_t type = nsIAccessibleEvent::EVENT_HIDE;
+    xpcAccessibleGeneric* xpcAcc = GetXPCAccessible(root);
+    xpcAccessibleGeneric* xpcParent = GetXPCAccessible(parent);
+    RemoteAccessible* next = root->RemoteNextSibling();
+    xpcAccessibleGeneric* xpcNext = next ? GetXPCAccessible(next) : nullptr;
+    RemoteAccessible* prev = root->RemotePrevSibling();
+    xpcAccessibleGeneric* xpcPrev = prev ? GetXPCAccessible(prev) : nullptr;
+    xpcAccessibleDocument* doc = GetAccService()->GetXPCDocument(this);
+    nsINode* node = nullptr;
+    event = new xpcAccHideEvent(type, xpcAcc, doc, node, aFromUser, xpcParent,
+                                xpcNext, xpcPrev);
+  }
+
+  parent->RemoveChild(root);
+  ShutdownOrPrepareForMove(root);
+
+  MOZ_ASSERT(CheckDocTree());
+
+  if (event) {
+    nsCoreUtils::DispatchAccEvent(std::move(event));
+  }
+
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult DocAccessibleParent::RecvEvent(
+    const uint64_t& aID, const uint32_t& aEventType) {
+  ACQUIRE_ANDROID_LOCK
+  if (mShutdown) {
+    return IPC_OK();
+  }
+  if (aEventType == 0 || aEventType >= nsIAccessibleEvent::EVENT_LAST_ENTRY) {
+    MOZ_ASSERT_UNREACHABLE("Invalid event");
+    return IPC_FAIL(this, "Invalid event");
+  }
+
+  RemoteAccessible* remote = GetAccessible(aID);
+  if (!remote) {
+    NS_ERROR("no proxy for event!");
+    return IPC_OK();
+  }
+
+  FireEvent(remote, aEventType);
+  return IPC_OK();
+}
+
+void DocAccessibleParent::FireEvent(RemoteAccessible* aAcc,
+                                    const uint32_t& aEventType) {
+  if (aEventType == nsIAccessibleEvent::EVENT_FOCUS) {
+#ifdef ANDROID
+    if (FocusMgr()) {
+      FocusMgr()->SetFocusedRemoteDoc(this);
+    }
+#endif
+    mFocus = aAcc->ID();
+  }
+
+  if (aEventType == nsIAccessibleEvent::EVENT_REORDER ||
+      aEventType == nsIAccessibleEvent::EVENT_INNER_REORDER) {
+    for (RemoteAccessible* child = aAcc->RemoteFirstChild(); child;
+         child = child->RemoteNextSibling()) {
+      child->InvalidateGroupInfo();
+    }
+  } else if (aEventType == nsIAccessibleEvent::EVENT_DOCUMENT_LOAD_COMPLETE &&
+             aAcc == this) {
+    // A DocAccessible gets the STALE state while it is still loading, but we
+    // don't fire a state change for that. That state might have been
+    // included in the initial cache push, so clear it here.
+    // We also clear the BUSY state here. Although we do fire a state change
+    // for that, we fire it after doc load complete. It doesn't make sense
+    // for the document to report BUSY after doc load complete and doing so
+    // confuses JAWS.
+    UpdateStateCache(states::STALE | states::BUSY, false);
+  }
+
+  ProxyEvent(aAcc, aEventType);
+
+  if (!nsCoreUtils::AccEventObserversExist()) {
+    return;
+  }
+
+  xpcAccessibleGeneric* xpcAcc = GetXPCAccessible(aAcc);
+  xpcAccessibleDocument* doc = GetAccService()->GetXPCDocument(this);
+  nsINode* node = nullptr;
+  bool fromUser = true;  // XXX fix me
+  RefPtr<xpcAccEvent> event =
+      new xpcAccEvent(aEventType, xpcAcc, doc, node, fromUser);
+  nsCoreUtils::DispatchAccEvent(std::move(event));
+}
+
+mozilla::ipc::IPCResult DocAccessibleParent::RecvStateChangeEvent(
+    const uint64_t& aID, const uint64_t& aState, const bool& aEnabled) {
+  ACQUIRE_ANDROID_LOCK
+  if (mShutdown) {
+    return IPC_OK();
+  }
+
+  RemoteAccessible* target = GetAccessible(aID);
+  if (!target) {
+    NS_ERROR("we don't know about the target of a state change event!");
+    return IPC_OK();
+  }
+
+  target->UpdateStateCache(aState, aEnabled);
+  if (nsCOMPtr<nsIObserverService> obsService =
+          services::GetObserverService()) {
+    obsService->NotifyObservers(nullptr, NS_ACCESSIBLE_CACHE_TOPIC, nullptr);
+  }
+  ProxyStateChangeEvent(target, aState, aEnabled);
+
+  if (!nsCoreUtils::AccEventObserversExist()) {
+    return IPC_OK();
+  }
+
+  xpcAccessibleGeneric* xpcAcc = GetXPCAccessible(target);
+  xpcAccessibleDocument* doc = GetAccService()->GetXPCDocument(this);
+  uint32_t type = nsIAccessibleEvent::EVENT_STATE_CHANGE;
+  bool extra;
+  uint32_t state = nsAccUtils::To32States(aState, &extra);
+  bool fromUser = true;     // XXX fix this
+  nsINode* node = nullptr;  // XXX can we do better?
+  RefPtr<xpcAccStateChangeEvent> event = new xpcAccStateChangeEvent(
+      type, xpcAcc, doc, node, fromUser, state, extra, aEnabled);
+  nsCoreUtils::DispatchAccEvent(std::move(event));
+
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult DocAccessibleParent::RecvCaretMoveEvent(
+    const uint64_t& aID,
+#if defined(XP_WIN)
+    const LayoutDeviceIntRect& aCaretRect,
+#endif  // defined (XP_WIN)
+    const int32_t& aOffset, const bool& aIsSelectionCollapsed,
+    const bool& aIsAtEndOfLine, const int32_t& aGranularity) {
+  ACQUIRE_ANDROID_LOCK
+  if (mShutdown) {
+    return IPC_OK();
+  }
+
+  RemoteAccessible* proxy = GetAccessible(aID);
+  if (!proxy) {
+    NS_ERROR("unknown caret move event target!");
+    return IPC_OK();
+  }
+
+  mCaretId = aID;
+  mCaretOffset = aOffset;
+  mIsCaretAtEndOfLine = aIsAtEndOfLine;
+  if (aIsSelectionCollapsed) {
+    // We don't fire selection events for collapsed selections, but we need to
+    // ensure we don't have a stale cached selection; e.g. when selecting
+    // forward and then unselecting backward.
+    mTextSelections.ClearAndRetainStorage();
+    mTextSelections.AppendElement(TextRangeData(aID, aID, aOffset, aOffset));
+  }
+
+#if defined(XP_WIN)
+  ProxyCaretMoveEvent(proxy, aCaretRect, aGranularity);
+#else
+  ProxyCaretMoveEvent(proxy, aOffset, aIsSelectionCollapsed, aGranularity);
+#endif
+
+  if (!nsCoreUtils::AccEventObserversExist()) {
+    return IPC_OK();
+  }
+
+  xpcAccessibleGeneric* xpcAcc = GetXPCAccessible(proxy);
+  xpcAccessibleDocument* doc = GetAccService()->GetXPCDocument(this);
+  nsINode* node = nullptr;
+  bool fromUser = true;  // XXX fix me
+  uint32_t type = nsIAccessibleEvent::EVENT_TEXT_CARET_MOVED;
+  RefPtr<xpcAccCaretMoveEvent> event = new xpcAccCaretMoveEvent(
+      type, xpcAcc, doc, node, fromUser, aOffset, aIsSelectionCollapsed,
+      aIsAtEndOfLine, aGranularity);
+  nsCoreUtils::DispatchAccEvent(std::move(event));
+
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult DocAccessibleParent::RecvTextChangeEvent(
+    const uint64_t& aID, const nsAString& aStr, const int32_t& aStart,
+    const uint32_t& aLen, const bool& aIsInsert, const bool& aFromUser) {
+  ACQUIRE_ANDROID_LOCK
+  if (mShutdown) {
+    return IPC_OK();
+  }
+
+  RemoteAccessible* target = GetAccessible(aID);
+  if (!target) {
+    NS_ERROR("text change event target is unknown!");
+    return IPC_OK();
+  }
+
+  ProxyTextChangeEvent(target, aStr, aStart, aLen, aIsInsert, aFromUser);
+
+  if (!nsCoreUtils::AccEventObserversExist()) {
+    return IPC_OK();
+  }
+
+  xpcAccessibleGeneric* xpcAcc = GetXPCAccessible(target);
+  xpcAccessibleDocument* doc = GetAccService()->GetXPCDocument(this);
+  uint32_t type = aIsInsert ? nsIAccessibleEvent::EVENT_TEXT_INSERTED
+                            : nsIAccessibleEvent::EVENT_TEXT_REMOVED;
+  nsINode* node = nullptr;
+  RefPtr<xpcAccTextChangeEvent> event = new xpcAccTextChangeEvent(
+      type, xpcAcc, doc, node, aFromUser, aStart, aLen, aIsInsert, aStr);
+  nsCoreUtils::DispatchAccEvent(std::move(event));
+
+  return IPC_OK();
+}
+
+#if defined(XP_WIN)
+
+mozilla::ipc::IPCResult DocAccessibleParent::RecvSyncTextChangeEvent(
+    const uint64_t& aID, const nsAString& aStr, const int32_t& aStart,
+    const uint32_t& aLen, const bool& aIsInsert, const bool& aFromUser) {
+  return RecvTextChangeEvent(aID, aStr, aStart, aLen, aIsInsert, aFromUser);
+}
+
+#endif  // defined(XP_WIN)
+
+mozilla::ipc::IPCResult DocAccessibleParent::RecvSelectionEvent(
+    const uint64_t& aID, const uint64_t& aWidgetID, const uint32_t& aType) {
+  ACQUIRE_ANDROID_LOCK
+  if (mShutdown) {
+    return IPC_OK();
+  }
+  if (aType == 0 || aType >= nsIAccessibleEvent::EVENT_LAST_ENTRY) {
+    MOZ_ASSERT_UNREACHABLE("Invalid event");
+    return IPC_FAIL(this, "Invalid event");
+  }
+
+  RemoteAccessible* target = GetAccessible(aID);
+  RemoteAccessible* widget = GetAccessible(aWidgetID);
+  if (!target || !widget) {
+    NS_ERROR("invalid id in selection event");
+    return IPC_OK();
+  }
+
+  ProxySelectionEvent(target, widget, aType);
+  if (!nsCoreUtils::AccEventObserversExist()) {
+    return IPC_OK();
+  }
+  xpcAccessibleGeneric* xpcTarget = GetXPCAccessible(target);
+  xpcAccessibleDocument* xpcDoc = GetAccService()->GetXPCDocument(this);
+  RefPtr<xpcAccEvent> event =
+      new xpcAccEvent(aType, xpcTarget, xpcDoc, nullptr, false);
+  nsCoreUtils::DispatchAccEvent(std::move(event));
+
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult DocAccessibleParent::RecvVirtualCursorChangeEvent(
+    const uint64_t& aID, const uint64_t& aOldPositionID,
+    const int32_t& aOldStartOffset, const int32_t& aOldEndOffset,
+    const uint64_t& aNewPositionID, const int32_t& aNewStartOffset,
+    const int32_t& aNewEndOffset, const int16_t& aReason,
+    const int16_t& aBoundaryType, const bool& aFromUser) {
+  ACQUIRE_ANDROID_LOCK
+  if (mShutdown) {
+    return IPC_OK();
+  }
+
+  RemoteAccessible* target = GetAccessible(aID);
+  RemoteAccessible* oldPosition = GetAccessible(aOldPositionID);
+  RemoteAccessible* newPosition = GetAccessible(aNewPositionID);
+
+  if (!target) {
+    NS_ERROR("no proxy for event!");
+    return IPC_OK();
+  }
+
+#if defined(ANDROID)
+  ProxyVirtualCursorChangeEvent(
+      target, oldPosition, aOldStartOffset, aOldEndOffset, newPosition,
+      aNewStartOffset, aNewEndOffset, aReason, aBoundaryType, aFromUser);
+#endif
+
+  if (!nsCoreUtils::AccEventObserversExist()) {
+    return IPC_OK();
+  }
+
+  xpcAccessibleDocument* doc = GetAccService()->GetXPCDocument(this);
+  RefPtr<xpcAccVirtualCursorChangeEvent> event =
+      new xpcAccVirtualCursorChangeEvent(
+          nsIAccessibleEvent::EVENT_VIRTUALCURSOR_CHANGED,
+          GetXPCAccessible(target), doc, nullptr, aFromUser,
+          GetXPCAccessible(oldPosition), aOldStartOffset, aOldEndOffset,
+          GetXPCAccessible(newPosition), aNewStartOffset, aNewEndOffset,
+          aReason, aBoundaryType);
+  nsCoreUtils::DispatchAccEvent(std::move(event));
+
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult DocAccessibleParent::RecvScrollingEvent(
+    const uint64_t& aID, const uint64_t& aType, const uint32_t& aScrollX,
+    const uint32_t& aScrollY, const uint32_t& aMaxScrollX,
+    const uint32_t& aMaxScrollY) {
+  ACQUIRE_ANDROID_LOCK
+  if (mShutdown) {
+    return IPC_OK();
+  }
+  if (aType == 0 || aType >= nsIAccessibleEvent::EVENT_LAST_ENTRY) {
+    MOZ_ASSERT_UNREACHABLE("Invalid event");
+    return IPC_FAIL(this, "Invalid event");
+  }
+
+  RemoteAccessible* target = GetAccessible(aID);
+  if (!target) {
+    NS_ERROR("no proxy for event!");
+    return IPC_OK();
+  }
+
+#if defined(ANDROID)
+  ProxyScrollingEvent(target, aType, aScrollX, aScrollY, aMaxScrollX,
+                      aMaxScrollY);
+#else
+  ProxyEvent(target, aType);
+#endif
+
+  if (!nsCoreUtils::AccEventObserversExist()) {
+    return IPC_OK();
+  }
+
+  xpcAccessibleGeneric* xpcAcc = GetXPCAccessible(target);
+  xpcAccessibleDocument* doc = GetAccService()->GetXPCDocument(this);
+  nsINode* node = nullptr;
+  bool fromUser = true;  // XXX: Determine if this was from user input.
+  RefPtr<xpcAccScrollingEvent> event =
+      new xpcAccScrollingEvent(aType, xpcAcc, doc, node, fromUser, aScrollX,
+                               aScrollY, aMaxScrollX, aMaxScrollY);
+  nsCoreUtils::DispatchAccEvent(std::move(event));
+
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult DocAccessibleParent::RecvCache(
+    const mozilla::a11y::CacheUpdateType& aUpdateType,
+    nsTArray<CacheData>&& aData) {
+  ACQUIRE_ANDROID_LOCK
+  if (mShutdown) {
+    return IPC_OK();
+  }
+
+  for (auto& entry : aData) {
+    RemoteAccessible* remote = GetAccessible(entry.ID());
+    if (!remote) {
+      MOZ_ASSERT_UNREACHABLE("No remote found!");
+      continue;
+    }
+
+    remote->ApplyCache(aUpdateType, entry.Fields());
+  }
+
+  if (nsCOMPtr<nsIObserverService> obsService =
+          services::GetObserverService()) {
+    obsService->NotifyObservers(nullptr, NS_ACCESSIBLE_CACHE_TOPIC, nullptr);
+  }
+
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult DocAccessibleParent::RecvSelectedAccessiblesChanged(
+    nsTArray<uint64_t>&& aSelectedIDs, nsTArray<uint64_t>&& aUnselectedIDs) {
+  ACQUIRE_ANDROID_LOCK
+  if (mShutdown) {
+    return IPC_OK();
+  }
+
+  for (auto& id : aSelectedIDs) {
+    RemoteAccessible* remote = GetAccessible(id);
+    if (!remote) {
+      MOZ_ASSERT_UNREACHABLE("No remote found!");
+      continue;
+    }
+
+    remote->UpdateStateCache(states::SELECTED, true);
+  }
+
+  for (auto& id : aUnselectedIDs) {
+    RemoteAccessible* remote = GetAccessible(id);
+    if (!remote) {
+      MOZ_ASSERT_UNREACHABLE("No remote found!");
+      continue;
+    }
+
+    remote->UpdateStateCache(states::SELECTED, false);
+  }
+
+  if (nsCOMPtr<nsIObserverService> obsService =
+          services::GetObserverService()) {
+    obsService->NotifyObservers(nullptr, NS_ACCESSIBLE_CACHE_TOPIC, nullptr);
+  }
+
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult DocAccessibleParent::RecvAccessiblesWillMove(
+    nsTArray<uint64_t>&& aIDs) {
+  for (uint64_t id : aIDs) {
+    mMovingIDs.EnsureInserted(id);
+  }
+  return IPC_OK();
+}
+
+#if !defined(XP_WIN)
+mozilla::ipc::IPCResult DocAccessibleParent::RecvAnnouncementEvent(
+    const uint64_t& aID, const nsAString& aAnnouncement,
+    const uint16_t& aPriority) {
+  ACQUIRE_ANDROID_LOCK
+  if (mShutdown) {
+    return IPC_OK();
+  }
+
+  RemoteAccessible* target = GetAccessible(aID);
+  if (!target) {
+    NS_ERROR("no proxy for event!");
+    return IPC_OK();
+  }
+
+#  if defined(ANDROID)
+  ProxyAnnouncementEvent(target, aAnnouncement, aPriority);
+#  endif
+
+  if (!nsCoreUtils::AccEventObserversExist()) {
+    return IPC_OK();
+  }
+
+  xpcAccessibleGeneric* xpcAcc = GetXPCAccessible(target);
+  xpcAccessibleDocument* doc = GetAccService()->GetXPCDocument(this);
+  RefPtr<xpcAccAnnouncementEvent> event = new xpcAccAnnouncementEvent(
+      nsIAccessibleEvent::EVENT_ANNOUNCEMENT, xpcAcc, doc, nullptr, false,
+      aAnnouncement, aPriority);
+  nsCoreUtils::DispatchAccEvent(std::move(event));
+
+  return IPC_OK();
+}
+#endif  // !defined(XP_WIN)
+
+mozilla::ipc::IPCResult DocAccessibleParent::RecvTextSelectionChangeEvent(
+    const uint64_t& aID, nsTArray<TextRangeData>&& aSelection) {
+  ACQUIRE_ANDROID_LOCK
+  if (mShutdown) {
+    return IPC_OK();
+  }
+
+  RemoteAccessible* target = GetAccessible(aID);
+  if (!target) {
+    NS_ERROR("no proxy for event!");
+    return IPC_OK();
+  }
+
+  mTextSelections.ClearAndRetainStorage();
+  mTextSelections.AppendElements(aSelection);
+
+#ifdef MOZ_WIDGET_COCOA
+  ProxyTextSelectionChangeEvent(target, aSelection);
+#else
+  ProxyEvent(target, nsIAccessibleEvent::EVENT_TEXT_SELECTION_CHANGED);
+#endif
+
+  if (!nsCoreUtils::AccEventObserversExist()) {
+    return IPC_OK();
+  }
+  xpcAccessibleGeneric* xpcAcc = GetXPCAccessible(target);
+  xpcAccessibleDocument* doc = nsAccessibilityService::GetXPCDocument(this);
+  nsINode* node = nullptr;
+  bool fromUser = true;  // XXX fix me
+  RefPtr<xpcAccEvent> event =
+      new xpcAccEvent(nsIAccessibleEvent::EVENT_TEXT_SELECTION_CHANGED, xpcAcc,
+                      doc, node, fromUser);
+  nsCoreUtils::DispatchAccEvent(std::move(event));
+
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult DocAccessibleParent::RecvRoleChangedEvent(
+    const a11y::role& aRole, const uint8_t& aRoleMapEntryIndex) {
+  ACQUIRE_ANDROID_LOCK
+  if (mShutdown) {
+    return IPC_OK();
+  }
+  if (!aria::IsRoleMapIndexValid(aRoleMapEntryIndex)) {
+    MOZ_ASSERT_UNREACHABLE("Invalid role map entry index");
+    return IPC_FAIL(this, "Invalid role map entry index");
+  }
+
+  mRole = aRole;
+  mRoleMapEntryIndex = aRoleMapEntryIndex;
+
+#ifdef MOZ_WIDGET_COCOA
+  ProxyRoleChangedEvent(this, aRole, aRoleMapEntryIndex);
+#endif
+
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult DocAccessibleParent::RecvBindChildDoc(
+    NotNull<PDocAccessibleParent*> aChildDoc, const uint64_t& aID) {
+  ACQUIRE_ANDROID_LOCK
+  // One document should never directly be the child of another.
+  // We should always have at least an outer doc accessible in between.
+  MOZ_ASSERT(aID);
+  if (!aID) return IPC_FAIL(this, "ID is 0!");
+
+  if (mShutdown) {
+    return IPC_OK();
+  }
+
+  MOZ_ASSERT(CheckDocTree());
+
+  auto childDoc = static_cast<DocAccessibleParent*>(aChildDoc.get());
+  childDoc->Unbind();
+  ipc::IPCResult result = AddChildDoc(childDoc, aID, false);
+  MOZ_ASSERT(result);
+  MOZ_ASSERT(CheckDocTree());
+#ifdef DEBUG
+  if (!result) {
+    return result;
+  }
+#else
+  result = IPC_OK();
+#endif
+
+  return result;
+}
+
+ipc::IPCResult DocAccessibleParent::AddChildDoc(DocAccessibleParent* aChildDoc,
+                                                uint64_t aParentID,
+                                                bool aCreating) {
+  // We do not use GetAccessible here because we want to be sure to not get the
+  // document it self.
+  ProxyEntry* e = mAccessibles.GetEntry(aParentID);
+  if (!e) {
+#ifndef FUZZING_SNAPSHOT
+    // This diagnostic assert and the one down below expect a well-behaved
+    // child process. In IPC fuzzing, we directly fuzz parameters of each
+    // method over IPDL and the asserts are not valid under these conditions.
+    MOZ_DIAGNOSTIC_ASSERT(false, "Binding to nonexistent proxy!");
+#endif
+    return IPC_FAIL(this, "binding to nonexistant proxy!");
+  }
+
+  RemoteAccessible* outerDoc = e->mProxy;
+  MOZ_ASSERT(outerDoc);
+
+  // OuterDocAccessibles are expected to only have a document as a child.
+  // However for compatibility we tolerate replacing one document with another
+  // here.
+  if (!outerDoc->IsOuterDoc() || outerDoc->ChildCount() > 1 ||
+      (outerDoc->ChildCount() == 1 && !outerDoc->RemoteChildAt(0)->IsDoc())) {
+#ifndef FUZZING_SNAPSHOT
+    MOZ_DIAGNOSTIC_ASSERT(false,
+                          "Binding to parent that isn't a valid OuterDoc!");
+#endif
+    return IPC_FAIL(this, "Binding to parent that isn't a valid OuterDoc!");
+  }
+
+  if (outerDoc->ChildCount() == 1) {
+    MOZ_ASSERT(outerDoc->RemoteChildAt(0)->AsDoc());
+    outerDoc->RemoteChildAt(0)->AsDoc()->Unbind();
+  }
+
+  aChildDoc->SetParent(outerDoc);
+  outerDoc->SetChildDoc(aChildDoc);
+  mChildDocs.AppendElement(aChildDoc->mActorID);
+  aChildDoc->mParentDoc = mActorID;
+
+  if (aCreating) {
+    ProxyCreated(aChildDoc);
+  }
+
+  if (aChildDoc->IsTopLevelInContentProcess()) {
+    // aChildDoc is an embedded document in a different content process to
+    // this document.
+    auto embeddedBrowser =
+        static_cast<dom::BrowserParent*>(aChildDoc->Manager());
+    dom::BrowserBridgeParent* bridge =
+        embeddedBrowser->GetBrowserBridgeParent();
+    if (bridge) {
+#if defined(XP_WIN)
+      if (nsWinUtils::IsWindowEmulationStarted()) {
+        aChildDoc->SetEmulatedWindowHandle(mEmulatedWindowHandle);
+      }
+#endif  // defined(XP_WIN)
+      // We need to fire a reorder event on the outer doc accessible.
+      // For same-process documents, this is fired by the content process, but
+      // this isn't possible when the document is in a different process to its
+      // embedder.
+      // FireEvent fires both OS and XPCOM events.
+      FireEvent(outerDoc, nsIAccessibleEvent::EVENT_REORDER);
+    }
+  }
+
+  return IPC_OK();
+}
+
+ipc::IPCResult DocAccessibleParent::AddChildDoc(
+    dom::BrowserBridgeParent* aBridge) {
+  MOZ_ASSERT(aBridge->GetEmbedderAccessibleDoc() == this);
+  uint64_t parentId = aBridge->GetEmbedderAccessibleId();
+  MOZ_ASSERT(parentId);
+  if (!mAccessibles.GetEntry(parentId)) {
+    // Sometimes, this gets called before the embedder sends us the
+    // OuterDocAccessible. We must add the child when the OuterDocAccessible
+    // gets created later.
+    mPendingOOPChildDocs.Insert(aBridge);
+    return IPC_OK();
+  }
+  return AddChildDoc(aBridge->GetDocAccessibleParent(), parentId,
+                     /* aCreating */ false);
+}
+
+mozilla::ipc::IPCResult DocAccessibleParent::RecvShutdown() {
+  ACQUIRE_ANDROID_LOCK
+  Destroy();
+
+  auto mgr = static_cast<dom::BrowserParent*>(Manager());
+  if (!mgr->IsDestroyed()) {
+    if (!PDocAccessibleParent::Send__delete__(this)) {
+      return IPC_FAIL_NO_REASON(mgr);
+    }
+  }
+
+  return IPC_OK();
+}
+
+void DocAccessibleParent::Destroy() {
+  // If we are already shutdown that is because our containing tab parent is
+  // shutting down in which case we don't need to do anything.
+  if (mShutdown) {
+    return;
+  }
+
+  mShutdown = true;
+  mBrowsingContext = nullptr;
+
+#ifdef ANDROID
+  if (FocusMgr() && FocusMgr()->IsFocusedRemoteDoc(this)) {
+    FocusMgr()->SetFocusedRemoteDoc(nullptr);
+  }
+#endif
+
+  MOZ_DIAGNOSTIC_ASSERT(LiveDocs().Contains(mActorID));
+  uint32_t childDocCount = mChildDocs.Length();
+  for (uint32_t i = 0; i < childDocCount; i++) {
+    for (uint32_t j = i + 1; j < childDocCount; j++) {
+      MOZ_DIAGNOSTIC_ASSERT(mChildDocs[i] != mChildDocs[j]);
+    }
+  }
+
+  // XXX This indirection through the hash map of live documents shouldn't be
+  // needed, but be paranoid for now.
+  int32_t actorID = mActorID;
+  for (uint32_t i = childDocCount - 1; i < childDocCount; i--) {
+    DocAccessibleParent* thisDoc = LiveDocs().Get(actorID);
+    MOZ_ASSERT(thisDoc);
+    if (!thisDoc) {
+      return;
+    }
+
+    thisDoc->ChildDocAt(i)->Destroy();
+  }
+
+  for (auto iter = mAccessibles.Iter(); !iter.Done(); iter.Next()) {
+    RemoteAccessible* acc = iter.Get()->mProxy;
+    MOZ_ASSERT(acc != this);
+    if (acc->IsTable()) {
+      CachedTableAccessible::Invalidate(acc);
+    }
+    ProxyDestroyed(acc);
+    iter.Remove();
+  }
+
+  DocAccessibleParent* thisDoc = LiveDocs().Get(actorID);
+  MOZ_ASSERT(thisDoc);
+  if (!thisDoc) {
+    return;
+  }
+
+  mChildren.Clear();
+  // The code above should have already completely cleared these, but to be
+  // extra safe make sure they are cleared here.
+  thisDoc->mAccessibles.Clear();
+  thisDoc->mChildDocs.Clear();
+
+  DocManager::NotifyOfRemoteDocShutdown(thisDoc);
+  thisDoc = LiveDocs().Get(actorID);
+  MOZ_ASSERT(thisDoc);
+  if (!thisDoc) {
+    return;
+  }
+
+  ProxyDestroyed(thisDoc);
+  thisDoc = LiveDocs().Get(actorID);
+  MOZ_ASSERT(thisDoc);
+  if (!thisDoc) {
+    return;
+  }
+
+  if (DocAccessibleParent* parentDoc = thisDoc->ParentDoc()) {
+    parentDoc->RemoveChildDoc(thisDoc);
+  } else if (IsTopLevel()) {
+    GetAccService()->RemoteDocShutdown(this);
+  }
+}
+
+void DocAccessibleParent::ActorDestroy(ActorDestroyReason aWhy) {
+  MOZ_ASSERT(CheckDocTree());
+  if (!mShutdown) {
+    ACQUIRE_ANDROID_LOCK
+    Destroy();
+  }
+}
+
+DocAccessibleParent* DocAccessibleParent::ParentDoc() const {
+  if (mParentDoc == kNoParentDoc) {
+    return nullptr;
+  }
+
+  return LiveDocs().Get(mParentDoc);
+}
+
+bool DocAccessibleParent::CheckDocTree() const {
+  size_t childDocs = mChildDocs.Length();
+  for (size_t i = 0; i < childDocs; i++) {
+    const DocAccessibleParent* childDoc = ChildDocAt(i);
+    if (!childDoc || childDoc->ParentDoc() != this) return false;
+
+    if (!childDoc->CheckDocTree()) {
+      return false;
+    }
+  }
+
+  return true;
+}
+
+xpcAccessibleGeneric* DocAccessibleParent::GetXPCAccessible(
+    RemoteAccessible* aProxy) {
+  xpcAccessibleDocument* doc = GetAccService()->GetXPCDocument(this);
+  MOZ_ASSERT(doc);
+
+  return doc->GetAccessible(aProxy);
+}
+
+#if defined(XP_WIN)
+void DocAccessibleParent::MaybeInitWindowEmulation() {
+  if (!nsWinUtils::IsWindowEmulationStarted()) {
+    return;
+  }
+
+  // XXX get the bounds from the browserParent instead of poking at accessibles
+  // which might not exist yet.
+  LocalAccessible* outerDoc = OuterDocOfRemoteBrowser();
+  if (!outerDoc) {
+    return;
+  }
+
+  RootAccessible* rootDocument = outerDoc->RootAccessible();
+  MOZ_ASSERT(rootDocument);
+
+  bool isActive = true;
+  LayoutDeviceIntRect rect(CW_USEDEFAULT, CW_USEDEFAULT, 0, 0);
+  if (Compatibility::IsDolphin()) {
+    rect = Bounds();
+    LayoutDeviceIntRect rootRect = rootDocument->Bounds();
+    rect.MoveToX(rootRect.X() - rect.X());
+    rect.MoveToY(rect.Y() - rootRect.Y());
+
+    auto browserParent = static_cast<dom::BrowserParent*>(Manager());
+    isActive = browserParent->GetDocShellIsActive();
+  }
+
+  // onCreate is guaranteed to be called synchronously by
+  // nsWinUtils::CreateNativeWindow, so this reference isn't really necessary.
+  // However, static analysis complains without it.
+  RefPtr<DocAccessibleParent> thisRef = this;
+  nsWinUtils::NativeWindowCreateProc onCreate([thisRef](HWND aHwnd) -> void {
+    ::SetPropW(aHwnd, kPropNameDocAccParent,
+               reinterpret_cast<HANDLE>(thisRef.get()));
+    thisRef->SetEmulatedWindowHandle(aHwnd);
+  });
+
+  HWND parentWnd = reinterpret_cast<HWND>(rootDocument->GetNativeWindow());
+  DebugOnly<HWND> hWnd = nsWinUtils::CreateNativeWindow(
+      kClassNameTabContent, parentWnd, rect.X(), rect.Y(), rect.Width(),
+      rect.Height(), isActive, &onCreate);
+  MOZ_ASSERT(hWnd);
+}
+
+void DocAccessibleParent::SetEmulatedWindowHandle(HWND aWindowHandle) {
+  if (!aWindowHandle && mEmulatedWindowHandle && IsTopLevel()) {
+    ::DestroyWindow(mEmulatedWindowHandle);
+  }
+  mEmulatedWindowHandle = aWindowHandle;
+}
+
+mozilla::ipc::IPCResult DocAccessibleParent::RecvFocusEvent(
+    const uint64_t& aID, const LayoutDeviceIntRect& aCaretRect) {
+  ACQUIRE_ANDROID_LOCK
+  if (mShutdown) {
+    return IPC_OK();
+  }
+
+  RemoteAccessible* proxy = GetAccessible(aID);
+  if (!proxy) {
+    NS_ERROR("no proxy for event!");
+    return IPC_OK();
+  }
+
+  mFocus = aID;
+  ProxyFocusEvent(proxy, aCaretRect);
+
+  if (!nsCoreUtils::AccEventObserversExist()) {
+    return IPC_OK();
+  }
+
+  xpcAccessibleGeneric* xpcAcc = GetXPCAccessible(proxy);
+  xpcAccessibleDocument* doc = GetAccService()->GetXPCDocument(this);
+  nsINode* node = nullptr;
+  bool fromUser = true;  // XXX fix me
+  RefPtr<xpcAccEvent> event = new xpcAccEvent(nsIAccessibleEvent::EVENT_FOCUS,
+                                              xpcAcc, doc, node, fromUser);
+  nsCoreUtils::DispatchAccEvent(std::move(event));
+
+  return IPC_OK();
+}
+
+#endif  // defined(XP_WIN)
+
+#if !defined(XP_WIN)
+bool DocAccessibleParent::DeallocPDocAccessiblePlatformExtParent(
+    PDocAccessiblePlatformExtParent* aActor) {
+  delete aActor;
+  return true;
+}
+
+PDocAccessiblePlatformExtParent*
+DocAccessibleParent::AllocPDocAccessiblePlatformExtParent() {
+  return new DocAccessiblePlatformExtParent();
+}
+
+DocAccessiblePlatformExtParent* DocAccessibleParent::GetPlatformExtension() {
+  return static_cast<DocAccessiblePlatformExtParent*>(
+      SingleManagedOrNull(ManagedPDocAccessiblePlatformExtParent()));
+}
+
+#endif  // !defined(XP_WIN)
+
+void DocAccessibleParent::SelectionRanges(nsTArray<TextRange>* aRanges) const {
+  for (const auto& data : mTextSelections) {
+    // Selection ranges should usually be in sync with the tree. However, tree
+    // and selection updates happen using separate IPDL calls, so it's possible
+    // for a client selection query to arrive between them. Thus, we validate
+    // the Accessibles and offsets here.
+    auto* startAcc =
+        const_cast<RemoteAccessible*>(GetAccessible(data.StartID()));
+    auto* endAcc = const_cast<RemoteAccessible*>(GetAccessible(data.EndID()));
+    if (!startAcc || !endAcc) {
+      continue;
+    }
+    uint32_t startCount = startAcc->CharacterCount();
+    if (startCount == 0 ||
+        data.StartOffset() > static_cast<int32_t>(startCount)) {
+      continue;
+    }
+    uint32_t endCount = endAcc->CharacterCount();
+    if (endCount == 0 || data.EndOffset() > static_cast<int32_t>(endCount)) {
+      continue;
+    }
+    aRanges->AppendElement(TextRange(const_cast<DocAccessibleParent*>(this),
+                                     startAcc, data.StartOffset(), endAcc,
+                                     data.EndOffset()));
+  }
+}
+
+Accessible* DocAccessibleParent::FocusedChild() {
+  LocalAccessible* outerDoc = OuterDocOfRemoteBrowser();
+  if (!outerDoc) {
+    return nullptr;
+  }
+
+  RootAccessible* rootDocument = outerDoc->RootAccessible();
+  return rootDocument->FocusedChild();
+}
+
+void DocAccessibleParent::URL(nsACString& aURL) const {
+  if (!mBrowsingContext) {
+    return;
+  }
+  nsCOMPtr<nsIURI> uri = mBrowsingContext->GetCurrentURI();
+  if (!uri) {
+    return;
+  }
+  // Let's avoid treating too long URI in the main process for avoiding
+  // memory fragmentation as far as possible.
+  if (uri->SchemeIs("data") || uri->SchemeIs("blob")) {
+    return;
+  }
+  nsCOMPtr<nsIIOService> io = mozilla::components::IO::Service();
+  if (NS_WARN_IF(!io)) {
+    return;
+  }
+  nsCOMPtr<nsIURI> exposableURI;
+  if (NS_FAILED(io->CreateExposableURI(uri, getter_AddRefs(exposableURI))) ||
+      MOZ_UNLIKELY(!exposableURI)) {
+    return;
+  }
+  exposableURI->GetSpec(aURL);
+}
+
+void DocAccessibleParent::URL(nsAString& aURL) const {
+  nsAutoCString url;
+  URL(url);
+  CopyUTF8toUTF16(url, aURL);
+}
+
+void DocAccessibleParent::MimeType(nsAString& aMime) const {
+  if (mCachedFields) {
+    mCachedFields->GetAttribute(nsGkAtoms::headerContentType, aMime);
+  }
+}
+
+Relation DocAccessibleParent::RelationByType(RelationType aType) const {
+  // If the accessible is top-level, provide the NODE_CHILD_OF relation so that
+  // MSAA clients can easily get to true parent instead of getting to oleacc's
+  // ROLE_WINDOW accessible when window emulation is enabled which will prevent
+  // us from going up further (because it is system generated and has no idea
+  // about the hierarchy above it).
+  if (aType == RelationType::NODE_CHILD_OF && IsTopLevel()) {
+    return Relation(Parent());
+  }
+
+  return RemoteAccessibleBase<RemoteAccessible>::RelationByType(aType);
+}
+
+DocAccessibleParent* DocAccessibleParent::GetFrom(
+    dom::BrowsingContext* aBrowsingContext) {
+  if (!aBrowsingContext) {
+    return nullptr;
+  }
+
+  dom::BrowserParent* bp = aBrowsingContext->Canonical()->GetBrowserParent();
+  if (!bp) {
+    return nullptr;
+  }
+
+  const ManagedContainer<PDocAccessibleParent>& docs =
+      bp->ManagedPDocAccessibleParent();
+  for (auto* key : docs) {
+    // Iterate over our docs until we find one with a browsing
+    // context that matches the one we passed in. Return that
+    // document.
+    auto* doc = static_cast<a11y::DocAccessibleParent*>(key);
+    if (doc->GetBrowsingContext() == aBrowsingContext) {
+      return doc;
+    }
+  }
+
+  return nullptr;
+}
+
+size_t DocAccessibleParent::SizeOfExcludingThis(MallocSizeOf aMallocSizeOf) {
+  size_t size = 0;
+
+  size += RemoteAccessibleBase::SizeOfExcludingThis(aMallocSizeOf);
+
+  size += mReverseRelations.ShallowSizeOfExcludingThis(aMallocSizeOf);
+  for (auto i = mReverseRelations.Iter(); !i.Done(); i.Next()) {
+    size += i.Data().ShallowSizeOfExcludingThis(aMallocSizeOf);
+    for (auto j = i.Data().Iter(); !j.Done(); j.Next()) {
+      size += j.Data().ShallowSizeOfExcludingThis(aMallocSizeOf);
+    }
+  }
+
+  size += mOnScreenAccessibles.ShallowSizeOfExcludingThis(aMallocSizeOf);
+
+  size += mChildDocs.ShallowSizeOfExcludingThis(aMallocSizeOf);
+
+  size += mAccessibles.ShallowSizeOfExcludingThis(aMallocSizeOf);
+  for (auto i = mAccessibles.Iter(); !i.Done(); i.Next()) {
+    size += i.Get()->mProxy->SizeOfIncludingThis(aMallocSizeOf);
+  }
+
+  size += mPendingOOPChildDocs.ShallowSizeOfExcludingThis(aMallocSizeOf);
+
+  // The mTextSelections array contains structs of integers.  We can count them
+  // by counting the size of the array - there's no deep structure here.
+  size += mTextSelections.ShallowSizeOfExcludingThis(aMallocSizeOf);
+
+  return size;
+}
+
+MOZ_DEFINE_MALLOC_SIZE_OF(MallocSizeOfAccessibilityCache);
+
+NS_IMETHODIMP
+DocAccessibleParent::CollectReports(nsIHandleReportCallback* aHandleReport,
+                                    nsISupports* aData, bool aAnon) {
+  nsAutoCString path;
+
+  if (aAnon) {
+    path = nsPrintfCString("explicit/a11y/cache(%" PRIu64 ")", mActorID);
+  } else {
+    nsCString url;
+    URL(url);
+    url.ReplaceChar(
+        '/', '\\');  // Tell the memory reporter this is not a path seperator.
+    path = nsPrintfCString("explicit/a11y/cache(%s)", url.get());
+  }
+
+  aHandleReport->Callback(
+      /* process */ ""_ns, path, KIND_HEAP, UNITS_BYTES,
+      SizeOfIncludingThis(MallocSizeOfAccessibilityCache),
+      nsLiteralCString("Size of the accessability cache for this document."),
+      aData);
+
+  return NS_OK;
+}
+
+NS_IMPL_ISUPPORTS(DocAccessibleParent, nsIMemoryReporter);
+
+}  // namespace a11y
+}  // namespace mozilla