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/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_Events::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