forked from mirrors/gecko-dev
42b7f1a58c
This prevents copies and avoids the hack we have to avoid this, which
right now is using nsDependent{C,}String.
Non-virtual actors can still use `nsString` if they need to on the
receiving end.
Differential Revision: https://phabricator.services.mozilla.com/D152519
115 lines
4 KiB
C++
115 lines
4 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "WebBrowserPersistDocumentParent.h"
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#include "mozilla/ipc/IPCStreamUtils.h"
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#include "mozilla/dom/PContentParent.h"
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#include "nsIInputStream.h"
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#include "nsThreadUtils.h"
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#include "WebBrowserPersistResourcesParent.h"
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#include "WebBrowserPersistSerializeParent.h"
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#include "WebBrowserPersistRemoteDocument.h"
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namespace mozilla {
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WebBrowserPersistDocumentParent::WebBrowserPersistDocumentParent()
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: mReflection(nullptr) {}
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void WebBrowserPersistDocumentParent::SetOnReady(
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nsIWebBrowserPersistDocumentReceiver* aOnReady) {
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MOZ_ASSERT(aOnReady);
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MOZ_ASSERT(!mOnReady);
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MOZ_ASSERT(!mReflection);
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mOnReady = aOnReady;
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}
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void WebBrowserPersistDocumentParent::ActorDestroy(ActorDestroyReason aWhy) {
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if (mReflection) {
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mReflection->ActorDestroy();
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mReflection = nullptr;
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}
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if (mOnReady) {
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// Bug 1202887: If this is part of a subtree destruction, then
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// anything which could cause another actor in that subtree to
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// be Send__delete__()ed will cause use-after-free -- such as
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// dropping the last reference to another document's
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// WebBrowserPersistRemoteDocument. To avoid that, defer the
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// callback until after the entire subtree is destroyed.
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nsCOMPtr<nsIRunnable> errorLater = NewRunnableMethod<nsresult>(
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"nsIWebBrowserPersistDocumentReceiver::OnError", mOnReady,
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&nsIWebBrowserPersistDocumentReceiver::OnError, NS_ERROR_FAILURE);
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NS_DispatchToCurrentThread(errorLater);
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mOnReady = nullptr;
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}
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}
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WebBrowserPersistDocumentParent::~WebBrowserPersistDocumentParent() {
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MOZ_RELEASE_ASSERT(!mReflection);
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MOZ_ASSERT(!mOnReady);
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}
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mozilla::ipc::IPCResult WebBrowserPersistDocumentParent::RecvAttributes(
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const Attrs& aAttrs, const Maybe<IPCStream>& aPostStream) {
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// Deserialize the postData unconditionally so that fds aren't leaked.
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nsCOMPtr<nsIInputStream> postData =
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mozilla::ipc::DeserializeIPCStream(aPostStream);
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if (!mOnReady || mReflection) {
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return IPC_FAIL_NO_REASON(this);
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}
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mReflection = new WebBrowserPersistRemoteDocument(this, aAttrs, postData);
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RefPtr<WebBrowserPersistRemoteDocument> reflection = mReflection;
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mOnReady->OnDocumentReady(reflection);
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mOnReady = nullptr;
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return IPC_OK();
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}
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mozilla::ipc::IPCResult WebBrowserPersistDocumentParent::RecvInitFailure(
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const nsresult& aFailure) {
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if (!mOnReady || mReflection) {
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return IPC_FAIL_NO_REASON(this);
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}
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mOnReady->OnError(aFailure);
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mOnReady = nullptr;
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// Warning: Send__delete__ deallocates this object.
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IProtocol* mgr = Manager();
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if (!Send__delete__(this)) {
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return IPC_FAIL_NO_REASON(mgr);
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}
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return IPC_OK();
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}
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PWebBrowserPersistResourcesParent*
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WebBrowserPersistDocumentParent::AllocPWebBrowserPersistResourcesParent() {
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MOZ_CRASH("Don't use this; construct the actor directly and AddRef.");
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return nullptr;
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}
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bool WebBrowserPersistDocumentParent::DeallocPWebBrowserPersistResourcesParent(
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PWebBrowserPersistResourcesParent* aActor) {
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// Turn the ref held by IPC back into an nsRefPtr.
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RefPtr<WebBrowserPersistResourcesParent> actor =
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already_AddRefed<WebBrowserPersistResourcesParent>(
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static_cast<WebBrowserPersistResourcesParent*>(aActor));
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return true;
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}
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PWebBrowserPersistSerializeParent*
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WebBrowserPersistDocumentParent::AllocPWebBrowserPersistSerializeParent(
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const WebBrowserPersistURIMap& aMap,
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const nsACString& aRequestedContentType, const uint32_t& aEncoderFlags,
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const uint32_t& aWrapColumn) {
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MOZ_CRASH("Don't use this; construct the actor directly.");
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return nullptr;
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}
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bool WebBrowserPersistDocumentParent::DeallocPWebBrowserPersistSerializeParent(
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PWebBrowserPersistSerializeParent* aActor) {
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delete aActor;
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return true;
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}
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} // namespace mozilla
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