Bug 1597499 - Move nsIDocShell::ChildOffset to BrowsingContext, r=nika

Differential Revision: https://phabricator.services.mozilla.com/D89969

docshell/base/BrowsingContext.cpp

@@ -489,6 +489,7 @@ void BrowsingContext::CreateFromIPC(BrowsingContext::IPCInitializer&& aInit,
 
   context->mWindowless = aInit.mWindowless;
   context->mCreatedDynamically = aInit.mCreatedDynamically;
+  context->mChildOffset = aInit.mChildOffset;
   if (context->GetHasSessionHistory()) {
     context->CreateChildSHistory();
     if (mozilla::SessionHistoryInParent()) {
@@ -528,7 +529,8 @@ BrowsingContext::BrowsingContext(WindowContext* aParentWindow,
       mEmbeddedByThisProcess(false),
       mUseRemoteTabs(false),
       mUseRemoteSubframes(false),
-      mCreatedDynamically(false) {
+      mCreatedDynamically(false),
+      mChildOffset(0) {
   MOZ_RELEASE_ASSERT(!mParentWindow || mParentWindow->Group() == mGroup);
   MOZ_RELEASE_ASSERT(mBrowsingContextId != 0);
   MOZ_RELEASE_ASSERT(mGroup);
@@ -717,7 +719,8 @@ void BrowsingContext::Attach(bool aFromIPC, ContentParent* aOriginProcess) {
       MOZ_DIAGNOSTIC_ASSERT(!GetParent()->IsDiscarded(),
                             "local attach call in discarded bc");
     }
-
+    mChildOffset =
+        mCreatedDynamically ? -1 : mParentWindow->Children().Length();
     mParentWindow->AppendChildBrowsingContext(this);
   } else {
     mGroup->Toplevels().AppendElement(this);
@@ -2369,6 +2372,7 @@ BrowsingContext::IPCInitializer BrowsingContext::GetIPCInitializer() {
   init.mUseRemoteTabs = mUseRemoteTabs;
   init.mUseRemoteSubframes = mUseRemoteSubframes;
   init.mCreatedDynamically = mCreatedDynamically;
+  init.mChildOffset = mChildOffset;
   init.mOriginAttributes = mOriginAttributes;
   if (mChildSessionHistory && mozilla::SessionHistoryInParent()) {
     init.mSessionHistoryIndex = mChildSessionHistory->Index();
@@ -3387,6 +3391,7 @@ void IPDLParamTraits<dom::BrowsingContext::IPCInitializer>::Write(
   WriteIPDLParam(aMessage, aActor, aInit.mUseRemoteTabs);
   WriteIPDLParam(aMessage, aActor, aInit.mUseRemoteSubframes);
   WriteIPDLParam(aMessage, aActor, aInit.mCreatedDynamically);
+  WriteIPDLParam(aMessage, aActor, aInit.mChildOffset);
   WriteIPDLParam(aMessage, aActor, aInit.mOriginAttributes);
   WriteIPDLParam(aMessage, aActor, aInit.mRequestContextId);
   WriteIPDLParam(aMessage, aActor, aInit.mSessionHistoryIndex);
@@ -3406,6 +3411,7 @@ bool IPDLParamTraits<dom::BrowsingContext::IPCInitializer>::Read(
                      &aInit->mUseRemoteSubframes) ||
       !ReadIPDLParam(aMessage, aIterator, aActor,
                      &aInit->mCreatedDynamically) ||
+      !ReadIPDLParam(aMessage, aIterator, aActor, &aInit->mChildOffset) ||
       !ReadIPDLParam(aMessage, aIterator, aActor, &aInit->mOriginAttributes) ||
       !ReadIPDLParam(aMessage, aIterator, aActor, &aInit->mRequestContextId) ||
       !ReadIPDLParam(aMessage, aIterator, aActor,

docshell/base/BrowsingContext.h

@@ -678,6 +678,7 @@ class BrowsingContext : public nsILoadContext, public nsWrapperCache {
     bool mUseRemoteTabs = false;
     bool mUseRemoteSubframes = false;
     bool mCreatedDynamically = false;
+    int32_t mChildOffset = 0;
     int32_t mSessionHistoryIndex = -1;
     int32_t mSessionHistoryCount = 0;
     OriginAttributes mOriginAttributes;
@@ -716,6 +717,8 @@ class BrowsingContext : public nsILoadContext, public nsWrapperCache {
 
   bool CreatedDynamically() const { return mCreatedDynamically; }
 
+  int32_t ChildOffset() const { return mChildOffset; }
+
   const OriginAttributes& OriginAttributesRef() { return mOriginAttributes; }
   nsresult SetOriginAttributes(const OriginAttributes& aAttrs);
 
@@ -1134,6 +1137,10 @@ class BrowsingContext : public nsILoadContext, public nsWrapperCache {
   // True if this BrowsingContext is for a frame that was added dynamically.
   bool mCreatedDynamically : 1;
 
+  // The original offset of this context in its container. This property is -1
+  // if this BrowsingContext is for a frame that was added dynamically.
+  int32_t mChildOffset;
+
   // The start time of user gesture, this is only available if the browsing
   // context is in process.
   TimeStamp mUserGestureStart;

docshell/base/nsDocShell.cpp

@@ -376,7 +376,6 @@ nsDocShell::nsDocShell(BrowsingContext* aBrowsingContext,
       mItemType(aBrowsingContext->IsContent() ? typeContent : typeChrome),
       mPreviousEntryIndex(-1),
       mLoadedEntryIndex(-1),
-      mChildOffset(0),
       mBusyFlags(BUSY_FLAGS_NONE),
       mAppType(nsIDocShell::APP_TYPE_UNKNOWN),
       mLoadType(0),
@@ -1023,7 +1022,7 @@ bool nsDocShell::MaybeHandleSubframeHistory(
         // it wasn't originally for some other frame.
         nsCOMPtr<nsISHEntry> shEntry;
         currentSH->GetChildSHEntryIfHasNoDynamicallyAddedChild(
-            mChildOffset, getter_AddRefs(shEntry));
+            mBrowsingContext->ChildOffset(), getter_AddRefs(shEntry));
         if (shEntry) {
           aLoadState->SetSHEntry(shEntry);
         }
@@ -2990,12 +2989,6 @@ nsDocShell::SetTreeOwner(nsIDocShellTreeOwner* aTreeOwner) {
   return NS_OK;
 }
 
-void nsDocShell::SetChildOffset(int32_t aChildOffset) {
-  mChildOffset = aChildOffset;
-}
-
-int32_t nsDocShell::GetChildOffset() { return mChildOffset; }
-
 NS_IMETHODIMP
 nsDocShell::GetHistoryID(nsID& aID) {
   aID = mBrowsingContext->GetHistoryID();
@@ -3049,24 +3042,11 @@ nsDocShell::AddChild(nsIDocShellTreeItem* aChild) {
   NS_ASSERTION(!mChildList.IsEmpty(),
                "child list must not be empty after a successful add");
 
-  nsCOMPtr<nsIDocShell> childDocShell = do_QueryInterface(aChild);
-  bool dynamic = nsDocShell::Cast(childDocShell)->GetCreatedDynamically();
-  if (!dynamic) {
-    nsCOMPtr<nsISHEntry> currentSH;
-    bool oshe = false;
-    GetCurrentSHEntry(getter_AddRefs(currentSH), &oshe);
-    if (currentSH) {
-      currentSH->HasDynamicallyAddedChild(&dynamic);
-    }
-  }
-  childDocShell->SetChildOffset(dynamic ? -1 : mChildList.Length() - 1);
-
   /* Set the child's global history if the parent has one */
   if (mBrowsingContext->GetUseGlobalHistory()) {
     // childDocShell->SetUseGlobalHistory(true);
     // this should be set through BC inherit
-    MOZ_ASSERT(nsDocShell::Cast(childDocShell)
+    MOZ_ASSERT(aChild->GetBrowsingContext()->GetUseGlobalHistory());
-                   ->mBrowsingContext->GetUseGlobalHistory());
   }
 
   if (aChild->ItemType() != mItemType) {
@@ -11832,7 +11812,8 @@ nsresult nsDocShell::AddToSessionHistory(
       MOZ_ALWAYS_SUCCEEDS(topWc->SetSHEntryHasUserInteraction(false));
     }
     if (!mOSHE || !LOAD_TYPE_HAS_FLAGS(mLoadType, LOAD_FLAGS_REPLACE_HISTORY)) {
-      rv = AddChildSHEntryToParent(entry, mChildOffset, aCloneChildren);
+      rv = AddChildSHEntryToParent(entry, mBrowsingContext->ChildOffset(),
+                                   aCloneChildren);
     }
   }
 

docshell/base/nsDocShell.h

@@ -1193,10 +1193,6 @@ class nsDocShell final : public nsDocLoader,
   int32_t mPreviousEntryIndex;
   int32_t mLoadedEntryIndex;
 
-  // Offset in the parent's child list.
-  // -1 if the docshell is added dynamically to the parent shell.
-  int32_t mChildOffset;
-
   BusyFlags mBusyFlags;
   AppType mAppType;
   uint32_t mLoadType;

docshell/base/nsIDocShell.idl

@@ -450,12 +450,6 @@ interface nsIDocShell : nsIDocShellTreeItem
    */
   readonly attribute nsIChannel currentDocumentChannel;
 
-  /**
-   * The original offset of this child in its container. This property is -1 for
-   * dynamically added docShells.
-   */
-  [notxpcom,nostdcall] attribute long childOffset;
-
   /**
    * Find out whether the docshell is currently in the middle of a page
    * transition. This is set just before the pagehide/unload events fire.

dom/chrome-webidl/BrowsingContext.webidl

@@ -201,6 +201,8 @@ interface BrowsingContext {
 
   // Resets the location change rate limit. Used for testing.
   void resetLocationChangeRateLimit();
+
+  readonly attribute long childOffset;
 };
 
 BrowsingContext includes LoadContextMixin;

toolkit/components/sessionstore/SessionStoreUtils.cpp

@@ -121,20 +121,12 @@ void SessionStoreUtils::ForEachNonDynamicChildFrame(
       return;
     }
 
-    if (context->CreatedDynamically()) {
+    if (!context->CreatedDynamically()) {
-      continue;
+      int32_t childOffset = context->ChildOffset();
-    }
-
-    nsCOMPtr<nsIDocShell> childDocShell(do_QueryInterface(item));
-    if (!childDocShell) {
-      aRv.Throw(NS_ERROR_FAILURE);
-      return;
-    }
-
-    int32_t childOffset = childDocShell->GetChildOffset();
       aCallback.Call(WindowProxyHolder(context.forget()), childOffset);
     }
   }
+}
 
 /* static */
 already_AddRefed<nsISupports>