The Tor Browser: layout/xul/nsContainerBoxObject.cpp@97036ab72558

Conditionally force memory storage according to privacy.thirdparty.isolate;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.

     1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

     2 /* This Source Code Form is subject to the terms of the Mozilla Public

     3  * License, v. 2.0. If a copy of the MPL was not distributed with this

     4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

     6 #include "nsCOMPtr.h"

     7 #include "nsIContainerBoxObject.h"

     8 #include "nsIBrowserBoxObject.h"

     9 #include "nsIEditorBoxObject.h"

    10 #include "nsIIFrameBoxObject.h"

    11 #include "nsBoxObject.h"

    12 #include "nsIDocShell.h"

    13 #include "nsIContent.h"

    14 #include "nsIDocument.h"

    15 #include "nsIFrame.h"

    16 #include "nsSubDocumentFrame.h"

    18 /**

    19  * nsContainerBoxObject implements deprecated nsIBrowserBoxObject,

    20  * nsIEditorBoxObject and nsIIFrameBoxObject interfaces only because of the

    21  * backward compatibility.

    22  */

    24 class nsContainerBoxObject : public nsBoxObject,

    25                              public nsIBrowserBoxObject,

    26                              public nsIEditorBoxObject,

    27                              public nsIIFrameBoxObject

    28 {

    29 public:

    30   NS_DECL_ISUPPORTS_INHERITED

    31   NS_DECL_NSICONTAINERBOXOBJECT

    32   NS_DECL_NSIBROWSERBOXOBJECT

    33   NS_DECL_NSIEDITORBOXOBJECT

    34   NS_DECL_NSIIFRAMEBOXOBJECT

    35 };

    37 NS_INTERFACE_MAP_BEGIN(nsContainerBoxObject)

    38   NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsIContainerBoxObject, nsIBrowserBoxObject)

    39   NS_INTERFACE_MAP_ENTRY(nsIBrowserBoxObject)

    40   NS_INTERFACE_MAP_ENTRY(nsIEditorBoxObject)

    41   NS_INTERFACE_MAP_ENTRY(nsIIFrameBoxObject)

    42 NS_INTERFACE_MAP_END_INHERITING(nsBoxObject)

    44 NS_IMPL_ADDREF_INHERITED(nsContainerBoxObject, nsBoxObject)

    45 NS_IMPL_RELEASE_INHERITED(nsContainerBoxObject, nsBoxObject)

    47 NS_IMETHODIMP nsContainerBoxObject::GetDocShell(nsIDocShell** aResult)

    48 {

    49   *aResult = nullptr;

    51   nsSubDocumentFrame *subDocFrame = do_QueryFrame(GetFrame(false));

    52   if (subDocFrame) {

    53     // Ok, the frame for mContent is an nsSubDocumentFrame, it knows how

    54     // to reach the docshell, so ask it...

    56     return subDocFrame->GetDocShell(aResult);

    57   }

    59   if (!mContent) {

    60     return NS_OK;

    61   }

    63   // No nsSubDocumentFrame available for mContent, try if there's a mapping

    64   // between mContent's document to mContent's subdocument.

    66   // XXXbz sXBL/XBL2 issue -- ownerDocument or currentDocument?

    67   nsIDocument *doc = mContent->GetDocument();

    69   if (!doc) {

    70     return NS_OK;

    71   }

    73   nsIDocument *sub_doc = doc->GetSubDocumentFor(mContent);

    75   if (!sub_doc) {

    76     return NS_OK;

    77   }

    79   NS_IF_ADDREF(*aResult = sub_doc->GetDocShell());

    80   return NS_OK;

    81 }

    83 nsresult

    84 NS_NewContainerBoxObject(nsIBoxObject** aResult)

    85 {

    86   *aResult = new nsContainerBoxObject();

    87   if (!*aResult)

    88     return NS_ERROR_OUT_OF_MEMORY;

    89   NS_ADDREF(*aResult);

    90   return NS_OK;

    91 }

The Tor Browser / file revision

layout/xul/nsContainerBoxObject.cpp@97036ab72558

layout/xul/nsContainerBoxObject.cpp