The Tor Browser: dom/xbl/nsXBLDocumentInfo.cpp@6474c204b198 (annotated)

dom/xbl/nsXBLDocumentInfo.cpp@6474c204b198 (annotated)

dom/xbl/nsXBLDocumentInfo.cpp

Wed, 31 Dec 2014 06:09:35 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 06:09:35 +0100
changeset 0: 6474c204b198
permissions: -rw-r--r--

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
 /* vim: set ts=2 sw=2 et tw=80: */
 /* This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 #include "mozilla/DebugOnly.h"
 #include "nsXBLDocumentInfo.h"
 #include "nsIDocument.h"
 #include "nsXBLPrototypeBinding.h"
 #include "nsIScriptObjectPrincipal.h"
 #include "nsIScriptContext.h"
 #include "nsIDOMDocument.h"
 #include "nsIDOMScriptObjectFactory.h"
 #include "jsapi.h"
 #include "jsfriendapi.h"
 #include "nsIURI.h"
 #include "nsIConsoleService.h"
 #include "nsIScriptError.h"
 #include "nsIChromeRegistry.h"
 #include "nsIPrincipal.h"
 #include "nsJSPrincipals.h"
 #include "nsIScriptSecurityManager.h"
 #include "nsContentUtils.h"
 #include "nsCxPusher.h"
 #include "nsDOMJSUtils.h"
 #include "mozilla/Services.h"
 #include "xpcpublic.h"
 #include "mozilla/scache/StartupCache.h"
 #include "mozilla/scache/StartupCacheUtils.h"
 #include "nsCCUncollectableMarker.h"
 #include "mozilla/dom/BindingUtils.h"
 #include "mozilla/dom/URL.h"
 using namespace mozilla;
 using namespace mozilla::scache;
 using namespace mozilla::dom;
 static const char kXBLCachePrefix[] = "xblcache";
 /* Implementation file */
 static PLDHashOperator
 TraverseProtos(const nsACString &aKey, nsXBLPrototypeBinding *aProto, void* aClosure)
 {
   nsCycleCollectionTraversalCallback *cb =
     static_cast<nsCycleCollectionTraversalCallback*>(aClosure);
   aProto->Traverse(*cb);
   return PL_DHASH_NEXT;
 }
 static PLDHashOperator
 UnlinkProtoJSObjects(const nsACString &aKey, nsXBLPrototypeBinding *aProto, void* aClosure)
 {
   aProto->UnlinkJSObjects();
   return PL_DHASH_NEXT;
 }
 struct ProtoTracer
 {
   const TraceCallbacks &mCallbacks;
   void *mClosure;
 };
 static PLDHashOperator
 TraceProtos(const nsACString &aKey, nsXBLPrototypeBinding *aProto, void* aClosure)
 {
   ProtoTracer* closure = static_cast<ProtoTracer*>(aClosure);
   aProto->Trace(closure->mCallbacks, closure->mClosure);
   return PL_DHASH_NEXT;
 }
 NS_IMPL_CYCLE_COLLECTION_CLASS(nsXBLDocumentInfo)
 NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(nsXBLDocumentInfo)
   if (tmp->mBindingTable) {
     tmp->mBindingTable->EnumerateRead(UnlinkProtoJSObjects, nullptr);
   }
   NS_IMPL_CYCLE_COLLECTION_UNLINK(mDocument)
 NS_IMPL_CYCLE_COLLECTION_UNLINK_END
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(nsXBLDocumentInfo)
   if (tmp->mDocument &&
       nsCCUncollectableMarker::InGeneration(cb, tmp->mDocument->GetMarkedCCGeneration())) {
     NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
     return NS_SUCCESS_INTERRUPTED_TRAVERSE;
   }
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mDocument)
   if (tmp->mBindingTable) {
     tmp->mBindingTable->EnumerateRead(TraverseProtos, &cb);
   }
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
 NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN(nsXBLDocumentInfo)
   if (tmp->mBindingTable) {
     ProtoTracer closure = { aCallbacks, aClosure };
     tmp->mBindingTable->EnumerateRead(TraceProtos, &closure);
   }
 NS_IMPL_CYCLE_COLLECTION_TRACE_END
 static void
 UnmarkXBLJSObject(void* aP, const char* aName, void* aClosure)
 {
   JS::ExposeObjectToActiveJS(static_cast<JSObject*>(aP));
 }
 static PLDHashOperator
 UnmarkProtos(const nsACString &aKey, nsXBLPrototypeBinding *aProto, void* aClosure)
 {
   aProto->Trace(TraceCallbackFunc(UnmarkXBLJSObject), nullptr);
   return PL_DHASH_NEXT;
 }
 void
 nsXBLDocumentInfo::MarkInCCGeneration(uint32_t aGeneration)
 {
   if (mDocument) {
     mDocument->MarkUncollectableForCCGeneration(aGeneration);
   }
   // Unmark any JS we hold
   if (mBindingTable) {
     mBindingTable->EnumerateRead(UnmarkProtos, nullptr);
   }
 }
 NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(nsXBLDocumentInfo)
   NS_INTERFACE_MAP_ENTRY(nsISupportsWeakReference)
   NS_INTERFACE_MAP_ENTRY(nsISupports)
 NS_INTERFACE_MAP_END
 NS_IMPL_CYCLE_COLLECTING_ADDREF(nsXBLDocumentInfo)
 NS_IMPL_CYCLE_COLLECTING_RELEASE(nsXBLDocumentInfo)
 nsXBLDocumentInfo::nsXBLDocumentInfo(nsIDocument* aDocument)
   : mDocument(aDocument),
     mScriptAccess(true),
     mIsChrome(false),
     mFirstBinding(nullptr)
 {
   nsIURI* uri = aDocument->GetDocumentURI();
   if (IsChromeURI(uri)) {
     // Cache whether or not this chrome XBL can execute scripts.
     nsCOMPtr<nsIXULChromeRegistry> reg =
       mozilla::services::GetXULChromeRegistryService();
     if (reg) {
       bool allow = true;
       reg->AllowScriptsForPackage(uri, &allow);
       mScriptAccess = allow;
     }
     mIsChrome = true;
   } else {
     // If this binding isn't running with system principal, then it's running
     // from a remote-XUL whitelisted domain. This is already a not-really-
     // supported configuration (among other things, we don't use XBL scopes in
     // that configuration for compatibility reasons). But we should still at
     // least make an effort to prevent binding code from running if content
     // script is disabled or if the source domain is blacklisted (since the
     // source domain for remote XBL must always be the same as the source domain
     // of the bound content).
     //
     // If we just ask the binding document if script is enabled, it will
     // discover that it has no inner window, and return false. So instead, we
     // short-circuit the normal compartment-managed script-disabling machinery,
     // and query the policy for the URI directly.
     bool allow;
     nsIScriptSecurityManager* ssm = nsContentUtils::GetSecurityManager();
     nsresult rv = ssm->PolicyAllowsScript(uri, &allow);
     mScriptAccess = NS_SUCCEEDED(rv) && allow;
   }
 }
 nsXBLDocumentInfo::~nsXBLDocumentInfo()
 {
   mozilla::DropJSObjects(this);
 }
 nsXBLPrototypeBinding*
 nsXBLDocumentInfo::GetPrototypeBinding(const nsACString& aRef)
 {
   if (!mBindingTable)
     return nullptr;
   if (aRef.IsEmpty()) {
     // Return our first binding
     return mFirstBinding;
   }
   return mBindingTable->Get(aRef);
 }
 nsresult
 nsXBLDocumentInfo::SetPrototypeBinding(const nsACString& aRef, nsXBLPrototypeBinding* aBinding)
 {
   if (!mBindingTable) {
     mBindingTable = new nsClassHashtable<nsCStringHashKey, nsXBLPrototypeBinding>();
     mozilla::HoldJSObjects(this);
   }
   NS_ENSURE_STATE(!mBindingTable->Get(aRef));
   mBindingTable->Put(aRef, aBinding);
   return NS_OK;
 }
 void
 nsXBLDocumentInfo::RemovePrototypeBinding(const nsACString& aRef)
 {
   if (mBindingTable) {
     nsAutoPtr<nsXBLPrototypeBinding> bindingToRemove;
     mBindingTable->RemoveAndForget(aRef, bindingToRemove);
     // We do not want to destroy the binding, so just forget it.
     bindingToRemove.forget();
   }
 }
 // Callback to enumerate over the bindings from this document and write them
 // out to the cache.
 static PLDHashOperator
 WriteBinding(const nsACString &aKey, nsXBLPrototypeBinding *aProto, void* aClosure)
 {
   aProto->Write((nsIObjectOutputStream*)aClosure);
   return PL_DHASH_NEXT;
 }
 // static
 nsresult
 nsXBLDocumentInfo::ReadPrototypeBindings(nsIURI* aURI, nsXBLDocumentInfo** aDocInfo)
 {
   *aDocInfo = nullptr;
   nsAutoCString spec(kXBLCachePrefix);
   nsresult rv = PathifyURI(aURI, spec);
   NS_ENSURE_SUCCESS(rv, rv);
   StartupCache* startupCache = StartupCache::GetSingleton();
   NS_ENSURE_TRUE(startupCache, NS_ERROR_FAILURE);
   nsAutoArrayPtr<char> buf;
   uint32_t len;
   rv = startupCache->GetBuffer(spec.get(), getter_Transfers(buf), &len);
   // GetBuffer will fail if the binding is not in the cache.
   if (NS_FAILED(rv))
     return rv;
   nsCOMPtr<nsIObjectInputStream> stream;
   rv = NewObjectInputStreamFromBuffer(buf, len, getter_AddRefs(stream));
   NS_ENSURE_SUCCESS(rv, rv);
   buf.forget();
   // The file compatibility.ini stores the build id. This is checked in
   // nsAppRunner.cpp and will delete the cache if a different build is
   // present. However, we check that the version matches here to be safe.
   uint32_t version;
   rv = stream->Read32(&version);
   NS_ENSURE_SUCCESS(rv, rv);
   if (version != XBLBinding_Serialize_Version) {
     // The version that exists is different than expected, likely created with a
     // different build, so invalidate the cache.
     startupCache->InvalidateCache();
     return NS_ERROR_NOT_AVAILABLE;
   }
   nsCOMPtr<nsIPrincipal> principal;
   nsContentUtils::GetSecurityManager()->
     GetSystemPrincipal(getter_AddRefs(principal));
   nsCOMPtr<nsIDOMDocument> domdoc;
   rv = NS_NewXBLDocument(getter_AddRefs(domdoc), aURI, nullptr, principal);
   NS_ENSURE_SUCCESS(rv, rv);
   nsCOMPtr<nsIDocument> doc = do_QueryInterface(domdoc);
   NS_ASSERTION(doc, "Must have a document!");
   nsRefPtr<nsXBLDocumentInfo> docInfo = new nsXBLDocumentInfo(doc);
   while (1) {
     uint8_t flags;
     nsresult rv = stream->Read8(&flags);
     NS_ENSURE_SUCCESS(rv, rv);
     if (flags == XBLBinding_Serialize_NoMoreBindings)
       break;
     rv = nsXBLPrototypeBinding::ReadNewBinding(stream, docInfo, doc, flags);
     if (NS_FAILED(rv)) {
       return rv;
     }
   }
   docInfo.swap(*aDocInfo);
   return NS_OK;
 }
 nsresult
 nsXBLDocumentInfo::WritePrototypeBindings()
 {
   // Only write out bindings with the system principal
   if (!nsContentUtils::IsSystemPrincipal(mDocument->NodePrincipal()))
     return NS_OK;
   nsAutoCString spec(kXBLCachePrefix);
   nsresult rv = PathifyURI(DocumentURI(), spec);
   NS_ENSURE_SUCCESS(rv, rv);
   StartupCache* startupCache = StartupCache::GetSingleton();
   NS_ENSURE_TRUE(startupCache, rv);
   nsCOMPtr<nsIObjectOutputStream> stream;
   nsCOMPtr<nsIStorageStream> storageStream;
   rv = NewObjectOutputWrappedStorageStream(getter_AddRefs(stream),
                                            getter_AddRefs(storageStream),
                                            true);
   NS_ENSURE_SUCCESS(rv, rv);
   rv = stream->Write32(XBLBinding_Serialize_Version);
   NS_ENSURE_SUCCESS(rv, rv);
   if (mBindingTable) {
     mBindingTable->EnumerateRead(WriteBinding, stream);
   }
   // write a end marker at the end
   rv = stream->Write8(XBLBinding_Serialize_NoMoreBindings);
   NS_ENSURE_SUCCESS(rv, rv);
   stream->Close();
   NS_ENSURE_SUCCESS(rv, rv);
   uint32_t len;
   nsAutoArrayPtr<char> buf;
   rv = NewBufferFromStorageStream(storageStream, getter_Transfers(buf), &len);
   NS_ENSURE_SUCCESS(rv, rv);
   return startupCache->PutBuffer(spec.get(), buf, len);
 }
 void
 nsXBLDocumentInfo::SetFirstPrototypeBinding(nsXBLPrototypeBinding* aBinding)
 {
   mFirstBinding = aBinding;
 }
 static PLDHashOperator
 FlushScopedSkinSheets(const nsACString &aKey, nsXBLPrototypeBinding *aProto, void* aClosure)
 {
   aProto->FlushSkinSheets();
   return PL_DHASH_NEXT;
 }
 void
 nsXBLDocumentInfo::FlushSkinStylesheets()
 {
   if (mBindingTable) {
     mBindingTable->EnumerateRead(FlushScopedSkinSheets, nullptr);
   }
 }
 #ifdef DEBUG
 void
 AssertInCompilationScope()
 {
   AutoJSContext cx;
   // Note - Inverting the order of these operands is a rooting hazard.
   MOZ_ASSERT(xpc::GetCompilationScope() == JS::CurrentGlobalOrNull(cx));
 }
 #endif

The Tor Browser / annotate

dom/xbl/nsXBLDocumentInfo.cpp@6474c204b198 (annotated)

dom/xbl/nsXBLDocumentInfo.cpp