content/common/swapped_out_messages.cc

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