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   return false;
  40 }
  41
  42 bool SwappedOutMessages::CanHandleWhileSwappedOut(
  43     const IPC::Message& msg) {
  44   // Any message the renderer is allowed to send while swapped out should
  45   // be handled by the browser.
  46   if (CanSendWhileSwappedOut(&msg))
  47     return true;
  48
  49   // We drop most other messages that arrive from a swapped out renderer.
  50   // However, some are important (e.g., ACKs) for keeping the browser and
  51   // renderer state consistent in case we later return to the renderer.
  52   // Note that synchronous messages that are not handled will receive an
  53   // error reply instead, to avoid leaving the renderer in a stuck state.
  54   switch (msg.type()) {
  55     // Sends an ACK.
  56     case ViewHostMsg_ShowView::ID:
  57     // Sends an ACK.
  58     case ViewHostMsg_ShowWidget::ID:
  59     // Sends an ACK.
  60     case ViewHostMsg_ShowFullscreenWidget::ID:
  61     // Updates browser state.
  62     case ViewHostMsg_RenderViewReady::ID:
  63     // Updates the previous navigation entry.
  64     case ViewHostMsg_UpdateState::ID:
  65     // Sends an ACK.
  66     case ViewHostMsg_UpdateTargetURL::ID:
  67     // We allow closing even if we are in the process of swapping out.
  68     case ViewHostMsg_Close::ID:
  69     // Sends an ACK.
  70     case ViewHostMsg_RequestMove::ID:
  71     // Sends an ACK.
  72     case AccessibilityHostMsg_Notifications::ID:
  73 #if defined(USE_X11)
  74     // Synchronous message when leaving a page with plugin.  In this case,
  75     // we want to destroy the plugin rather than return an error message.
  76     case ViewHostMsg_DestroyPluginContainer::ID:
  77 #endif
  78       return true;
  79     default:
  80       break;
  81   }
  82
  83   // Check with the embedder as well.
  84   ContentClient* client = GetContentClient();
  85   return client->CanHandleWhileSwappedOut(msg);
  86 }
  87
  88 }  // namespace content