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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "content/common/swapped_out_messages.h"
#include "content/common/accessibility_messages.h"
#include "content/common/frame_messages.h"
#include "content/common/view_messages.h"
#include "content/public/common/content_client.h"
namespace content {
bool SwappedOutMessages::CanSendWhileSwappedOut(const IPC::Message* msg) {
// We filter out most IPC messages when swapped out. However, some are
// important (e.g., ACKs) for keeping the browser and renderer state
// consistent in case we later return to the same renderer.
switch (msg->type()) {
// Handled by RenderViewHost.
case FrameHostMsg_RenderProcessGone::ID:
case ViewHostMsg_ClosePage_ACK::ID:
case ViewHostMsg_Focus::ID:
case ViewHostMsg_ShowFullscreenWidget::ID:
case ViewHostMsg_ShowWidget::ID:
case ViewHostMsg_UpdateTargetURL::ID:
// Allow cross-process JavaScript calls.
case ViewHostMsg_RouteCloseEvent::ID:
// Send page scale factor reset notification upon cross-process navigations.
case ViewHostMsg_PageScaleFactorChanged::ID:
// Allow history.back() in OOPIFs - https://crbug.com/845923.
case ViewHostMsg_GoToEntryAtOffset::ID:
return true;
default:
break;
}
// Check with the embedder as well.
ContentClient* client = GetContentClient();
return client->CanSendWhileSwappedOut(msg);
}
bool SwappedOutMessages::CanHandleWhileSwappedOut(
const IPC::Message& msg) {
// Any message the renderer is allowed to send while swapped out should
// be handled by the browser.
if (CanSendWhileSwappedOut(&msg))
return true;
// We drop most other messages that arrive from a swapped out renderer.
// However, some are important (e.g., ACKs) for keeping the browser and
// renderer state consistent in case we later return to the renderer.
// Note that synchronous messages that are not handled will receive an
// error reply instead, to avoid leaving the renderer in a stuck state.
switch (msg.type()) {
// We allow closing even if we are in the process of swapping out.
case ViewHostMsg_Close::ID:
// Sends an ACK.
case ViewHostMsg_RequestSetBounds::ID:
// Sends an ACK.
case AccessibilityHostMsg_EventBundle::ID:
return true;
default:
break;
}
return false;
}
} // namespace content
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