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      1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #include "content/common/swapped_out_messages.h"
      6 
      7 #include "content/common/accessibility_messages.h"
      8 #include "content/common/input_messages.h"
      9 #include "content/common/view_messages.h"
     10 #include "content/public/common/content_client.h"
     11 
     12 namespace content {
     13 
     14 bool SwappedOutMessages::CanSendWhileSwappedOut(const IPC::Message* msg) {
     15   // We filter out most IPC messages when swapped out.  However, some are
     16   // important (e.g., ACKs) for keeping the browser and renderer state
     17   // consistent in case we later return to the same renderer.
     18   switch (msg->type()) {
     19     // Handled by RenderWidget.
     20     case InputHostMsg_HandleInputEvent_ACK::ID:
     21     case ViewHostMsg_PaintAtSize_ACK::ID:
     22     case ViewHostMsg_UpdateRect::ID:
     23     // Allow targeted navigations while swapped out.
     24     case ViewHostMsg_OpenURL::ID:
     25     case ViewHostMsg_Focus::ID:
     26     // Handled by RenderView.
     27     case ViewHostMsg_RenderProcessGone::ID:
     28     case ViewHostMsg_ShouldClose_ACK::ID:
     29     case ViewHostMsg_SwapOut_ACK::ID:
     30     case ViewHostMsg_ClosePage_ACK::ID:
     31     case ViewHostMsg_DomOperationResponse::ID:
     32     case ViewHostMsg_SwapCompositorFrame::ID:
     33     case ViewHostMsg_UpdateIsDelayed::ID:
     34     case ViewHostMsg_DidActivateAcceleratedCompositing::ID:
     35     // Allow cross-process JavaScript calls.
     36     case ViewHostMsg_RouteCloseEvent::ID:
     37     case ViewHostMsg_RouteMessageEvent::ID:
     38       return true;
     39     default:
     40       break;
     41   }
     42 
     43   // Check with the embedder as well.
     44   ContentClient* client = GetContentClient();
     45   return client->CanSendWhileSwappedOut(msg);
     46 }
     47 
     48 bool SwappedOutMessages::CanHandleWhileSwappedOut(
     49     const IPC::Message& msg) {
     50   // Any message the renderer is allowed to send while swapped out should
     51   // be handled by the browser.
     52   if (CanSendWhileSwappedOut(&msg))
     53     return true;
     54 
     55   // We drop most other messages that arrive from a swapped out renderer.
     56   // However, some are important (e.g., ACKs) for keeping the browser and
     57   // renderer state consistent in case we later return to the renderer.
     58   // Note that synchronous messages that are not handled will receive an
     59   // error reply instead, to avoid leaving the renderer in a stuck state.
     60   switch (msg.type()) {
     61     // Sends an ACK.
     62     case ViewHostMsg_ShowView::ID:
     63     // Sends an ACK.
     64     case ViewHostMsg_ShowWidget::ID:
     65     // Sends an ACK.
     66     case ViewHostMsg_ShowFullscreenWidget::ID:
     67     // Updates browser state.
     68     case ViewHostMsg_RenderViewReady::ID:
     69     // Updates the previous navigation entry.
     70     case ViewHostMsg_UpdateState::ID:
     71     // Sends an ACK.
     72     case ViewHostMsg_UpdateTargetURL::ID:
     73     // We allow closing even if we are in the process of swapping out.
     74     case ViewHostMsg_Close::ID:
     75     // Sends an ACK.
     76     case ViewHostMsg_RequestMove::ID:
     77     // Sends an ACK.
     78     case AccessibilityHostMsg_Notifications::ID:
     79 #if defined(USE_X11)
     80     // Synchronous message when leaving a page with plugin.  In this case,
     81     // we want to destroy the plugin rather than return an error message.
     82     case ViewHostMsg_DestroyPluginContainer::ID:
     83 #endif
     84       return true;
     85     default:
     86       break;
     87   }
     88 
     89   // Check with the embedder as well.
     90   ContentClient* client = GetContentClient();
     91   return client->CanHandleWhileSwappedOut(msg);
     92 }
     93 
     94 }  // namespace content
     95