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 #include "content/shell/common/shell_messages.h"
  13
  14 namespace content {
  15
  16 bool SwappedOutMessages::CanSendWhileSwappedOut(const IPC::Message* msg) {
  17   // We filter out most IPC messages when swapped out.  However, some are
  18   // important (e.g., ACKs) for keeping the browser and renderer state
  19   // consistent in case we later return to the same renderer.
  20   switch (msg->type()) {
  21     // Handled by RenderWidgetHost.
  22     case InputHostMsg_HandleInputEvent_ACK::ID:
  23     case ViewHostMsg_UpdateRect::ID:
  24     // Allow targeted navigations while swapped out.
  25     case FrameHostMsg_OpenURL::ID:
  26     case ViewHostMsg_Focus::ID:
  27     // Handled by RenderViewHost.
  28     case ViewHostMsg_ClosePage_ACK::ID:
  29     case ViewHostMsg_SwapCompositorFrame::ID:
  30     // Handled by WorkerMessageFilter (or by SharedWorkerMessageFilter when
  31     // embedded-shared-worker is enabled).
  32     case ViewHostMsg_DocumentDetached::ID:
  33     // Allow cross-process JavaScript calls.
  34     case ViewHostMsg_RouteCloseEvent::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     // Used in layout tests; handled in BlinkTestController.
  51     case ShellViewHostMsg_PrintMessage::ID:
  52       return true;
  53     default:
  54       break;
  55   }
  56
  57   // Check with the embedder as well.
  58   ContentClient* client = GetContentClient();
  59   return client->CanSendWhileSwappedOut(msg);
  60 }
  61
  62 bool SwappedOutMessages::CanHandleWhileSwappedOut(
  63     const IPC::Message& msg) {
  64   // Any message the renderer is allowed to send while swapped out should
  65   // be handled by the browser.
  66   if (CanSendWhileSwappedOut(&msg))
  67     return true;
  68
  69   // We drop most other messages that arrive from a swapped out renderer.
  70   // However, some are important (e.g., ACKs) for keeping the browser and
  71   // renderer state consistent in case we later return to the renderer.
  72   // Note that synchronous messages that are not handled will receive an
  73   // error reply instead, to avoid leaving the renderer in a stuck state.
  74   switch (msg.type()) {
  75     // Sends an ACK.
  76     case ViewHostMsg_ShowView::ID:
  77     // Sends an ACK.
  78     case ViewHostMsg_ShowWidget::ID:
  79     // Sends an ACK.
  80     case ViewHostMsg_ShowFullscreenWidget::ID:
  81     // Updates browser state.
  82     case ViewHostMsg_RenderViewReady::ID:
  83     // Updates the previous navigation entry.
  84     case ViewHostMsg_UpdateState::ID:
  85     // Sends an ACK.
  86     case ViewHostMsg_UpdateTargetURL::ID:
  87     // We allow closing even if we are in the process of swapping out.
  88     case ViewHostMsg_Close::ID:
  89     // Sends an ACK.
  90     case ViewHostMsg_RequestMove::ID:
  91     // Sends an ACK.
  92     case AccessibilityHostMsg_Events::ID:
  93       return true;
  94     default:
  95       break;
  96   }
  97
  98   return false;
  99 }
 100
 101 }  // namespace content