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_UpdateRect::ID:
  23     // Allow targeted navigations while swapped out.
  24     case FrameHostMsg_OpenURL::ID:
  25     case ViewHostMsg_Focus::ID:
  26     // Handled by RenderViewHost.
  27     case ViewHostMsg_ClosePage_ACK::ID:
  28     case ViewHostMsg_SwapCompositorFrame::ID:
  29     // Handled by WorkerMessageFilter (or by SharedWorkerMessageFilter when
  30     // embedded-shared-worker is enabled).
  31     case ViewHostMsg_DocumentDetached::ID:
  32     // Allow cross-process JavaScript calls.
  33     case ViewHostMsg_RouteCloseEvent::ID:
  34     case ViewHostMsg_RouteMessageEvent::ID:
  35     // Handled by RenderFrameHost.
  36     case FrameHostMsg_BeforeUnload_ACK::ID:
  37     case FrameHostMsg_SwapOut_ACK::ID:
  38     case FrameHostMsg_RenderProcessGone::ID:
  39     // Frame detach must occur after the RenderView has swapped out.
  40     case FrameHostMsg_Detach::ID:
  41     case FrameHostMsg_DomOperationResponse::ID:
  42     case FrameHostMsg_CompositorFrameSwappedACK::ID:
  43     case FrameHostMsg_ReclaimCompositorResources::ID:
  44     // Input events propagate from parent to child.
  45     case FrameHostMsg_ForwardInputEvent::ID:
  46     case FrameHostMsg_InitializeChildFrame::ID:
  47     // The browser should always have an accurate mirror of the renderer's
  48     // notion of the current page id.
  49     case FrameHostMsg_DidAssignPageId::ID:
  50       return true;
  51     default:
  52       break;
  53   }
  54
  55   // Check with the embedder as well.
  56   ContentClient* client = GetContentClient();
  57   return client->CanSendWhileSwappedOut(msg);
  58 }
  59
  60 bool SwappedOutMessages::CanHandleWhileSwappedOut(
  61     const IPC::Message& msg) {
  62   // Any message the renderer is allowed to send while swapped out should
  63   // be handled by the browser.
  64   if (CanSendWhileSwappedOut(&msg))
  65     return true;
  66
  67   // We drop most other messages that arrive from a swapped out renderer.
  68   // However, some are important (e.g., ACKs) for keeping the browser and
  69   // renderer state consistent in case we later return to the renderer.
  70   // Note that synchronous messages that are not handled will receive an
  71   // error reply instead, to avoid leaving the renderer in a stuck state.
  72   switch (msg.type()) {
  73     // Sends an ACK.
  74     case ViewHostMsg_ShowView::ID:
  75     // Sends an ACK.
  76     case ViewHostMsg_ShowWidget::ID:
  77     // Sends an ACK.
  78     case ViewHostMsg_ShowFullscreenWidget::ID:
  79     // Updates browser state.
  80     case ViewHostMsg_RenderViewReady::ID:
  81     // Updates the previous navigation entry.
  82     case ViewHostMsg_UpdateState::ID:
  83     // Sends an ACK.
  84     case ViewHostMsg_UpdateTargetURL::ID:
  85     // We allow closing even if we are in the process of swapping out.
  86     case ViewHostMsg_Close::ID:
  87     // Sends an ACK.
  88     case ViewHostMsg_RequestMove::ID:
  89     // Sends an ACK.
  90     case AccessibilityHostMsg_Events::ID:
  91       return true;
  92     default:
  93       break;
  94   }
  95
  96   return false;
  97 }
  98
  99 }  // namespace content