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/frame_messages.h"
   9 #include "content/common/input_messages.h"
  10 #include "content/common/view_messages.h"
  11 #include "content/public/common/content_client.h"
  12
  13 namespace content {
  14
  15 bool SwappedOutMessages::CanSendWhileSwappedOut(const IPC::Message* msg) {
  16   // We filter out most IPC messages when swapped out.  However, some are
  17   // important (e.g., ACKs) for keeping the browser and renderer state
  18   // consistent in case we later return to the same renderer.
  19   switch (msg->type()) {
  20     // Handled by RenderWidgetHost.
  21     case InputHostMsg_HandleInputEvent_ACK::ID:
  22     case ViewHostMsg_PaintAtSize_ACK::ID:
  23     case ViewHostMsg_UpdateRect::ID:
  24     // Allow targeted navigations while swapped out.
  25     case ViewHostMsg_OpenURL::ID:
  26     case ViewHostMsg_Focus::ID:
  27     // Handled by RenderViewHost.
  28     case ViewHostMsg_RenderProcessGone::ID:
  29     case ViewHostMsg_ShouldClose_ACK::ID:
  30     case ViewHostMsg_SwapOut_ACK::ID:
  31     case ViewHostMsg_ClosePage_ACK::ID:
  32     case ViewHostMsg_DomOperationResponse::ID:
  33     case ViewHostMsg_SwapCompositorFrame::ID:
  34     case ViewHostMsg_UpdateIsDelayed::ID:
  35     case ViewHostMsg_DidActivateAcceleratedCompositing::ID:
  36     // Allow cross-process JavaScript calls.
  37     case ViewHostMsg_RouteCloseEvent::ID:
  38     case ViewHostMsg_RouteMessageEvent::ID:
  39     // Handled by RenderFrameHost.
  40     case FrameHostMsg_SwapOut_ACK::ID:
  41     // Frame detach must occur after the RenderView has swapped out.
  42     case FrameHostMsg_Detach::ID:
  43       return true;
  44     default:
  45       break;
  46   }
  47
  48   // Check with the embedder as well.
  49   ContentClient* client = GetContentClient();
  50   return client->CanSendWhileSwappedOut(msg);
  51 }
  52
  53 bool SwappedOutMessages::CanHandleWhileSwappedOut(
  54     const IPC::Message& msg) {
  55   // Any message the renderer is allowed to send while swapped out should
  56   // be handled by the browser.
  57   if (CanSendWhileSwappedOut(&msg))
  58     return true;
  59
  60   // We drop most other messages that arrive from a swapped out renderer.
  61   // However, some are important (e.g., ACKs) for keeping the browser and
  62   // renderer state consistent in case we later return to the renderer.
  63   // Note that synchronous messages that are not handled will receive an
  64   // error reply instead, to avoid leaving the renderer in a stuck state.
  65   switch (msg.type()) {
  66     // Sends an ACK.
  67     case ViewHostMsg_ShowView::ID:
  68     // Sends an ACK.
  69     case ViewHostMsg_ShowWidget::ID:
  70     // Sends an ACK.
  71     case ViewHostMsg_ShowFullscreenWidget::ID:
  72     // Updates browser state.
  73     case ViewHostMsg_RenderViewReady::ID:
  74     // Updates the previous navigation entry.
  75     case ViewHostMsg_UpdateState::ID:
  76     // Sends an ACK.
  77     case ViewHostMsg_UpdateTargetURL::ID:
  78     // We allow closing even if we are in the process of swapping out.
  79     case ViewHostMsg_Close::ID:
  80     // Sends an ACK.
  81     case ViewHostMsg_RequestMove::ID:
  82     // Sends an ACK.
  83     case AccessibilityHostMsg_Events::ID:
  84 #if defined(USE_X11)
  85     // Synchronous message when leaving a page with plugin.  In this case,
  86     // we want to destroy the plugin rather than return an error message.
  87     case ViewHostMsg_DestroyPluginContainer::ID:
  88 #endif
  89       return true;
  90     default:
  91       break;
  92   }
  93
  94   // Check with the embedder as well.
  95   ContentClient* client = GetContentClient();
  96   return client->CanHandleWhileSwappedOut(msg);
  97 }
  98
  99 }  // namespace content