The Tor Browser: js/xpconnect/src/nsXPConnect.cpp@a63d609f5ebe (annotated)

js/xpconnect/src/nsXPConnect.cpp@a63d609f5ebe (annotated)

js/xpconnect/src/nsXPConnect.cpp

Thu, 15 Jan 2015 15:55:04 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Thu, 15 Jan 2015 15:55:04 +0100
branch: TOR_BUG_9701
changeset 9: a63d609f5ebe
permissions: -rw-r--r--

Back out 97036ab72558 which inappropriately compared turds to third parties.

 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
 /* vim: set ts=8 sts=4 et sw=4 tw=99: */
 /* 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/. */
 /* High level class and public functions implementation. */
 #include "mozilla/Assertions.h"
 #include "mozilla/Base64.h"
 #include "mozilla/Likely.h"
 #include "xpcprivate.h"
 #include "XPCWrapper.h"
 #include "jsfriendapi.h"
 #include "js/OldDebugAPI.h"
 #include "nsJSEnvironment.h"
 #include "nsThreadUtils.h"
 #include "nsDOMJSUtils.h"
 #include "WrapperFactory.h"
 #include "AccessCheck.h"
 #ifdef MOZ_JSDEBUGGER
 #include "jsdIDebuggerService.h"
 #endif
 #include "XPCQuickStubs.h"
 #include "mozilla/dom/BindingUtils.h"
 #include "mozilla/dom/Exceptions.h"
 #include "mozilla/dom/PromiseBinding.h"
 #include "mozilla/dom/TextDecoderBinding.h"
 #include "mozilla/dom/TextEncoderBinding.h"
 #include "mozilla/dom/DOMErrorBinding.h"
 #include "nsDOMMutationObserver.h"
 #include "nsICycleCollectorListener.h"
 #include "nsThread.h"
 #include "mozilla/XPTInterfaceInfoManager.h"
 #include "nsIObjectInputStream.h"
 #include "nsIObjectOutputStream.h"
 using namespace mozilla;
 using namespace mozilla::dom;
 using namespace xpc;
 using namespace JS;
 NS_IMPL_ISUPPORTS(nsXPConnect,
                   nsIXPConnect,
                   nsISupportsWeakReference,
                   nsIThreadObserver,
                   nsIJSRuntimeService)
 nsXPConnect* nsXPConnect::gSelf = nullptr;
 bool         nsXPConnect::gOnceAliveNowDead = false;
 uint32_t     nsXPConnect::gReportAllJSExceptions = 0;
 bool         xpc::gDebugMode = false;
 bool         xpc::gDesiredDebugMode = false;
 // Global cache of the default script security manager (QI'd to
 // nsIScriptSecurityManager)
 nsIScriptSecurityManager *nsXPConnect::gScriptSecurityManager = nullptr;
 const char XPC_CONTEXT_STACK_CONTRACTID[] = "@mozilla.org/js/xpc/ContextStack;1";
 const char XPC_RUNTIME_CONTRACTID[]       = "@mozilla.org/js/xpc/RuntimeService;1";
 const char XPC_EXCEPTION_CONTRACTID[]     = "@mozilla.org/js/xpc/Exception;1";
 const char XPC_CONSOLE_CONTRACTID[]       = "@mozilla.org/consoleservice;1";
 const char XPC_SCRIPT_ERROR_CONTRACTID[]  = "@mozilla.org/scripterror;1";
 const char XPC_ID_CONTRACTID[]            = "@mozilla.org/js/xpc/ID;1";
 const char XPC_XPCONNECT_CONTRACTID[]     = "@mozilla.org/js/xpc/XPConnect;1";
 /***************************************************************************/
 nsXPConnect::nsXPConnect()
     :   mRuntime(nullptr),
         mShuttingDown(false),
         mEventDepth(0)
 {
     mRuntime = XPCJSRuntime::newXPCJSRuntime(this);
     char* reportableEnv = PR_GetEnv("MOZ_REPORT_ALL_JS_EXCEPTIONS");
     if (reportableEnv && *reportableEnv)
         gReportAllJSExceptions = 1;
 }
 nsXPConnect::~nsXPConnect()
 {
     mRuntime->DeleteSingletonScopes();
     mRuntime->DestroyJSContextStack();
     // In order to clean up everything properly, we need to GC twice: once now,
     // to clean anything that can go away on its own (like the Junk Scope, which
     // we unrooted above), and once after forcing a bunch of shutdown in
     // XPConnect, to clean the stuff we forcibly disconnected. The forced
     // shutdown code defaults to leaking in a number of situations, so we can't
     // get by with only the second GC. :-(
     JS_GC(mRuntime->Runtime());
     mShuttingDown = true;
     XPCWrappedNativeScope::SystemIsBeingShutDown();
     mRuntime->SystemIsBeingShutDown();
     // The above causes us to clean up a bunch of XPConnect data structures,
     // after which point we need to GC to clean everything up. We need to do
     // this before deleting the XPCJSRuntime, because doing so destroys the
     // maps that our finalize callback depends on.
     JS_GC(mRuntime->Runtime());
     mDefaultSecurityManager = nullptr;
     gScriptSecurityManager = nullptr;
     // shutdown the logging system
     XPC_LOG_FINISH();
     delete mRuntime;
     gSelf = nullptr;
     gOnceAliveNowDead = true;
 }
 // static
 void
 nsXPConnect::InitStatics()
 {
     gSelf = new nsXPConnect();
     gOnceAliveNowDead = false;
     if (!gSelf->mRuntime) {
         NS_RUNTIMEABORT("Couldn't create XPCJSRuntime.");
     }
     // Initial extra ref to keep the singleton alive
     // balanced by explicit call to ReleaseXPConnectSingleton()
     NS_ADDREF(gSelf);
     // Set XPConnect as the main thread observer.
     if (NS_FAILED(nsThread::SetMainThreadObserver(gSelf))) {
         MOZ_CRASH();
     }
 }
 nsXPConnect*
 nsXPConnect::GetSingleton()
 {
     nsXPConnect* xpc = nsXPConnect::XPConnect();
     NS_IF_ADDREF(xpc);
     return xpc;
 }
 // static
 void
 nsXPConnect::ReleaseXPConnectSingleton()
 {
     nsXPConnect* xpc = gSelf;
     if (xpc) {
         nsThread::SetMainThreadObserver(nullptr);
         nsrefcnt cnt;
         NS_RELEASE2(xpc, cnt);
     }
 }
 // static
 XPCJSRuntime*
 nsXPConnect::GetRuntimeInstance()
 {
     nsXPConnect* xpc = XPConnect();
     return xpc->GetRuntime();
 }
 // static
 bool
 nsXPConnect::IsISupportsDescendant(nsIInterfaceInfo* info)
 {
     bool found = false;
     if (info)
         info->HasAncestor(&NS_GET_IID(nsISupports), &found);
     return found;
 }
 void
 xpc::SystemErrorReporter(JSContext *cx, const char *message, JSErrorReport *rep)
 {
     // It would be nice to assert !DescribeScriptedCaller here, to be sure
     // that there isn't any script running that could catch the exception. But
     // the JS engine invokes the error reporter directly if someone reports an
     // ErrorReport that it doesn't know how to turn into an exception. Arguably
     // it should just learn how to throw everything. But either way, if the
     // exception is ending here, it's not going to get propagated to a caller,
     // so it's up to us to make it known.
     nsresult rv;
     /* Use the console service to register the error. */
     nsCOMPtr<nsIConsoleService> consoleService =
         do_GetService(NS_CONSOLESERVICE_CONTRACTID);
     /*
      * Make an nsIScriptError, populate it with information from this
      * error, then log it with the console service.
      */
     nsCOMPtr<nsIScriptError> errorObject =
         do_CreateInstance(NS_SCRIPTERROR_CONTRACTID);
     if (consoleService && errorObject) {
         uint32_t column = rep->uctokenptr - rep->uclinebuf;
         const char16_t* ucmessage =
             static_cast<const char16_t*>(rep->ucmessage);
         const char16_t* uclinebuf =
             static_cast<const char16_t*>(rep->uclinebuf);
         rv = errorObject->Init(
               ucmessage ? nsDependentString(ucmessage) : EmptyString(),
               NS_ConvertASCIItoUTF16(rep->filename),
               uclinebuf ? nsDependentString(uclinebuf) : EmptyString(),
               rep->lineno, column, rep->flags,
               "system javascript");
         if (NS_SUCCEEDED(rv))
             consoleService->LogMessage(errorObject);
     }
     if (nsContentUtils::DOMWindowDumpEnabled()) {
         fprintf(stderr, "System JS : %s %s:%d - %s\n",
                 JSREPORT_IS_WARNING(rep->flags) ? "WARNING" : "ERROR",
                 rep->filename, rep->lineno,
                 message ? message : "<no message>");
     }
 }
 /***************************************************************************/
 nsresult
 nsXPConnect::GetInfoForIID(const nsIID * aIID, nsIInterfaceInfo** info)
 {
   return XPTInterfaceInfoManager::GetSingleton()->GetInfoForIID(aIID, info);
 }
 nsresult
 nsXPConnect::GetInfoForName(const char * name, nsIInterfaceInfo** info)
 {
   nsresult rv = XPTInterfaceInfoManager::GetSingleton()->GetInfoForName(name, info);
   return NS_FAILED(rv) ? NS_OK : NS_ERROR_NO_INTERFACE;
 }
 NS_IMETHODIMP
 nsXPConnect::GarbageCollect(uint32_t reason)
 {
     GetRuntime()->Collect(reason);
     return NS_OK;
 }
 bool
 xpc_GCThingIsGrayCCThing(void *thing)
 {
     return AddToCCKind(js::GCThingTraceKind(thing)) &&
            xpc_IsGrayGCThing(thing);
 }
 void
 xpc_MarkInCCGeneration(nsISupports* aVariant, uint32_t aGeneration)
 {
     nsCOMPtr<XPCVariant> variant = do_QueryInterface(aVariant);
     if (variant) {
         variant->SetCCGeneration(aGeneration);
         variant->GetJSVal(); // Unmarks gray JSObject.
         XPCVariant* weak = variant.get();
         variant = nullptr;
         if (weak->IsPurple()) {
           weak->RemovePurple();
         }
     }
 }
 void
 xpc_TryUnmarkWrappedGrayObject(nsISupports* aWrappedJS)
 {
     nsCOMPtr<nsIXPConnectWrappedJS> wjs = do_QueryInterface(aWrappedJS);
     if (wjs) {
         // Unmarks gray JSObject.
         static_cast<nsXPCWrappedJS*>(wjs.get())->GetJSObject();
     }
 }
 /***************************************************************************/
 /***************************************************************************/
 // nsIXPConnect interface methods...
 template<typename T>
 static inline T UnexpectedFailure(T rv)
 {
     NS_ERROR("This is not supposed to fail!");
     return rv;
 }
 /* void initClasses (in JSContextPtr aJSContext, in JSObjectPtr aGlobalJSObj); */
 NS_IMETHODIMP
 nsXPConnect::InitClasses(JSContext * aJSContext, JSObject * aGlobalJSObj)
 {
     MOZ_ASSERT(aJSContext, "bad param");
     MOZ_ASSERT(aGlobalJSObj, "bad param");
     RootedObject globalJSObj(aJSContext, aGlobalJSObj);
     JSAutoCompartment ac(aJSContext, globalJSObj);
     XPCWrappedNativeScope* scope =
         XPCWrappedNativeScope::GetNewOrUsed(aJSContext, globalJSObj);
     if (!scope)
         return UnexpectedFailure(NS_ERROR_FAILURE);
     scope->RemoveWrappedNativeProtos();
     if (!XPCNativeWrapper::AttachNewConstructorObject(aJSContext, globalJSObj))
         return UnexpectedFailure(NS_ERROR_FAILURE);
     return NS_OK;
 }
 #ifdef DEBUG
 static void
 VerifyTraceXPCGlobalCalled(JSTracer *trc, void **thingp, JSGCTraceKind kind)
 {
     // We don't do anything here, we only want to verify that TraceXPCGlobal
     // was called.
 }
 struct VerifyTraceXPCGlobalCalledTracer : public JSTracer
 {
     bool ok;
     VerifyTraceXPCGlobalCalledTracer(JSRuntime *rt)
       : JSTracer(rt, VerifyTraceXPCGlobalCalled), ok(false)
     {}
 };
 #endif
 void
 xpc::TraceXPCGlobal(JSTracer *trc, JSObject *obj)
 {
 #ifdef DEBUG
     if (trc->callback == VerifyTraceXPCGlobalCalled) {
         // We don't do anything here, we only want to verify that TraceXPCGlobal
         // was called.
         reinterpret_cast<VerifyTraceXPCGlobalCalledTracer*>(trc)->ok = true;
         return;
     }
 #endif
     if (js::GetObjectClass(obj)->flags & JSCLASS_DOM_GLOBAL)
         mozilla::dom::TraceProtoAndIfaceCache(trc, obj);
     // We might be called from a GC during the creation of a global, before we've
     // been able to set up the compartment private or the XPCWrappedNativeScope,
     // so we need to null-check those.
     xpc::CompartmentPrivate* compartmentPrivate = GetCompartmentPrivate(obj);
     if (compartmentPrivate && compartmentPrivate->scope)
         compartmentPrivate->scope->TraceInside(trc);
 }
 namespace xpc {
 JSObject*
 CreateGlobalObject(JSContext *cx, const JSClass *clasp, nsIPrincipal *principal,
                    JS::CompartmentOptions& aOptions)
 {
     MOZ_ASSERT(NS_IsMainThread(), "using a principal off the main thread?");
     MOZ_ASSERT(principal);
     RootedObject global(cx,
                         JS_NewGlobalObject(cx, clasp, nsJSPrincipals::get(principal),
                                            JS::DontFireOnNewGlobalHook, aOptions));
     if (!global)
         return nullptr;
     JSAutoCompartment ac(cx, global);
     // The constructor automatically attaches the scope to the compartment private
     // of |global|.
     (void) new XPCWrappedNativeScope(cx, global);
 #ifdef DEBUG
     // Verify that the right trace hook is called. Note that this doesn't
     // work right for wrapped globals, since the tracing situation there is
     // more complicated. Manual inspection shows that they do the right thing.
     if (!((const js::Class*)clasp)->ext.isWrappedNative)
     {
         VerifyTraceXPCGlobalCalledTracer trc(JS_GetRuntime(cx));
         JS_TraceChildren(&trc, global, JSTRACE_OBJECT);
         MOZ_ASSERT(trc.ok, "Trace hook on global needs to call TraceXPCGlobal for XPConnect compartments.");
     }
 #endif
     if (clasp->flags & JSCLASS_DOM_GLOBAL) {
         const char* className = clasp->name;
         AllocateProtoAndIfaceCache(global,
                                    (strcmp(className, "Window") == 0 ||
                                     strcmp(className, "ChromeWindow") == 0)
                                    ? ProtoAndIfaceCache::WindowLike
                                    : ProtoAndIfaceCache::NonWindowLike);
     }
     return global;
 }
 bool
 InitGlobalObject(JSContext* aJSContext, JS::Handle<JSObject*> aGlobal, uint32_t aFlags)
 {
     // Immediately enter the global's compartment, so that everything else we
     // create ends up there.
     JSAutoCompartment ac(aJSContext, aGlobal);
     if (!(aFlags & nsIXPConnect::OMIT_COMPONENTS_OBJECT)) {
         // XPCCallContext gives us an active request needed to save/restore.
         if (!GetCompartmentPrivate(aGlobal)->scope->AttachComponentsObject(aJSContext) ||
             !XPCNativeWrapper::AttachNewConstructorObject(aJSContext, aGlobal)) {
             return UnexpectedFailure(false);
         }
     }
     if (ShouldDiscardSystemSource()) {
         nsIPrincipal *prin = GetObjectPrincipal(aGlobal);
         bool isSystem = nsContentUtils::IsSystemPrincipal(prin);
         if (!isSystem) {
             short status = prin->GetAppStatus();
             isSystem = status == nsIPrincipal::APP_STATUS_PRIVILEGED ||
                        status == nsIPrincipal::APP_STATUS_CERTIFIED;
         }
         JS::CompartmentOptionsRef(aGlobal).setDiscardSource(isSystem);
     }
     // Stuff coming through this path always ends up as a DOM global.
     MOZ_ASSERT(js::GetObjectClass(aGlobal)->flags & JSCLASS_DOM_GLOBAL);
     // Init WebIDL binding constructors wanted on all XPConnect globals.
     //
     // XXX Please do not add any additional classes here without the approval of
     //     the XPConnect module owner.
     if (!PromiseBinding::GetConstructorObject(aJSContext, aGlobal) ||
         !TextDecoderBinding::GetConstructorObject(aJSContext, aGlobal) ||
         !TextEncoderBinding::GetConstructorObject(aJSContext, aGlobal) ||
         !DOMErrorBinding::GetConstructorObject(aJSContext, aGlobal)) {
         return UnexpectedFailure(false);
     }
     if (!(aFlags & nsIXPConnect::DONT_FIRE_ONNEWGLOBALHOOK))
         JS_FireOnNewGlobalObject(aJSContext, aGlobal);
     return true;
 }
 } // namespace xpc
 NS_IMETHODIMP
 nsXPConnect::InitClassesWithNewWrappedGlobal(JSContext * aJSContext,
                                              nsISupports *aCOMObj,
                                              nsIPrincipal * aPrincipal,
                                              uint32_t aFlags,
                                              JS::CompartmentOptions& aOptions,
                                              nsIXPConnectJSObjectHolder **_retval)
 {
     MOZ_ASSERT(aJSContext, "bad param");
     MOZ_ASSERT(aCOMObj, "bad param");
     MOZ_ASSERT(_retval, "bad param");
     // We pass null for the 'extra' pointer during global object creation, so
     // we need to have a principal.
     MOZ_ASSERT(aPrincipal);
     // Call into XPCWrappedNative to make a new global object, scope, and global
     // prototype.
     xpcObjectHelper helper(aCOMObj);
     MOZ_ASSERT(helper.GetScriptableFlags() & nsIXPCScriptable::IS_GLOBAL_OBJECT);
     nsRefPtr<XPCWrappedNative> wrappedGlobal;
     nsresult rv =
         XPCWrappedNative::WrapNewGlobal(helper, aPrincipal,
                                         aFlags & nsIXPConnect::INIT_JS_STANDARD_CLASSES,
                                         aOptions, getter_AddRefs(wrappedGlobal));
     NS_ENSURE_SUCCESS(rv, rv);
     // Grab a copy of the global and enter its compartment.
     RootedObject global(aJSContext, wrappedGlobal->GetFlatJSObject());
     MOZ_ASSERT(!js::GetObjectParent(global));
     if (!InitGlobalObject(aJSContext, global, aFlags))
         return UnexpectedFailure(NS_ERROR_FAILURE);
     wrappedGlobal.forget(_retval);
     return NS_OK;
 }
 static nsresult
 NativeInterface2JSObject(HandleObject aScope,
                          nsISupports *aCOMObj,
                          nsWrapperCache *aCache,
                          const nsIID * aIID,
                          bool aAllowWrapping,
                          MutableHandleValue aVal,
                          nsIXPConnectJSObjectHolder **aHolder)
 {
     AutoJSContext cx;
     JSAutoCompartment ac(cx, aScope);
     nsresult rv;
     xpcObjectHelper helper(aCOMObj, aCache);
     if (!XPCConvert::NativeInterface2JSObject(aVal, aHolder, helper, aIID,
                                               nullptr, aAllowWrapping, &rv))
         return rv;
     MOZ_ASSERT(aAllowWrapping || !xpc::WrapperFactory::IsXrayWrapper(&aVal.toObject()),
                "Shouldn't be returning a xray wrapper here");
     return NS_OK;
 }
 /* nsIXPConnectJSObjectHolder wrapNative (in JSContextPtr aJSContext, in JSObjectPtr aScope, in nsISupports aCOMObj, in nsIIDRef aIID); */
 NS_IMETHODIMP
 nsXPConnect::WrapNative(JSContext * aJSContext,
                         JSObject * aScopeArg,
                         nsISupports *aCOMObj,
                         const nsIID & aIID,
                         nsIXPConnectJSObjectHolder **aHolder)
 {
     MOZ_ASSERT(aHolder, "bad param");
     MOZ_ASSERT(aJSContext, "bad param");
     MOZ_ASSERT(aScopeArg, "bad param");
     MOZ_ASSERT(aCOMObj, "bad param");
     RootedObject aScope(aJSContext, aScopeArg);
     RootedValue v(aJSContext);
     return NativeInterface2JSObject(aScope, aCOMObj, nullptr, &aIID,
                                     true, &v, aHolder);
 }
 /* void wrapNativeToJSVal (in JSContextPtr aJSContext, in JSObjectPtr aScope, in nsISupports aCOMObj, in nsIIDPtr aIID, out jsval aVal, out nsIXPConnectJSObjectHolder aHolder); */
 NS_IMETHODIMP
 nsXPConnect::WrapNativeToJSVal(JSContext *aJSContext,
                                JSObject *aScopeArg,
                                nsISupports *aCOMObj,
                                nsWrapperCache *aCache,
                                const nsIID *aIID,
                                bool aAllowWrapping,
                                MutableHandleValue aVal)
 {
     MOZ_ASSERT(aJSContext, "bad param");
     MOZ_ASSERT(aScopeArg, "bad param");
     MOZ_ASSERT(aCOMObj, "bad param");
     RootedObject aScope(aJSContext, aScopeArg);
     return NativeInterface2JSObject(aScope, aCOMObj, aCache, aIID,
                                     aAllowWrapping, aVal, nullptr);
 }
 /* void wrapJS (in JSContextPtr aJSContext, in JSObjectPtr aJSObj, in nsIIDRef aIID, [iid_is (aIID), retval] out nsQIResult result); */
 NS_IMETHODIMP
 nsXPConnect::WrapJS(JSContext * aJSContext,
                     JSObject * aJSObjArg,
                     const nsIID & aIID,
                     void * *result)
 {
     MOZ_ASSERT(aJSContext, "bad param");
     MOZ_ASSERT(aJSObjArg, "bad param");
     MOZ_ASSERT(result, "bad param");
     *result = nullptr;
     RootedObject aJSObj(aJSContext, aJSObjArg);
     JSAutoCompartment ac(aJSContext, aJSObj);
     nsresult rv = NS_ERROR_UNEXPECTED;
     if (!XPCConvert::JSObject2NativeInterface(result, aJSObj,
                                               &aIID, nullptr, &rv))
         return rv;
     return NS_OK;
 }
 NS_IMETHODIMP
 nsXPConnect::JSValToVariant(JSContext *cx,
                             HandleValue aJSVal,
                             nsIVariant **aResult)
 {
     NS_PRECONDITION(aResult, "bad param");
     nsRefPtr<XPCVariant> variant = XPCVariant::newVariant(cx, aJSVal);
     variant.forget(aResult);
     NS_ENSURE_TRUE(*aResult, NS_ERROR_OUT_OF_MEMORY);
     return NS_OK;
 }
 /* void wrapJSAggregatedToNative (in nsISupports aOuter, in JSContextPtr aJSContext, in JSObjectPtr aJSObj, in nsIIDRef aIID, [iid_is (aIID), retval] out nsQIResult result); */
 NS_IMETHODIMP
 nsXPConnect::WrapJSAggregatedToNative(nsISupports *aOuter,
                                       JSContext *aJSContext,
                                       JSObject *aJSObjArg,
                                       const nsIID &aIID,
                                       void **result)
 {
     MOZ_ASSERT(aOuter, "bad param");
     MOZ_ASSERT(aJSContext, "bad param");
     MOZ_ASSERT(aJSObjArg, "bad param");
     MOZ_ASSERT(result, "bad param");
     *result = nullptr;
     RootedObject aJSObj(aJSContext, aJSObjArg);
     nsresult rv;
     if (!XPCConvert::JSObject2NativeInterface(result, aJSObj,
                                               &aIID, aOuter, &rv))
         return rv;
     return NS_OK;
 }
 /* nsIXPConnectWrappedNative getWrappedNativeOfJSObject (in JSContextPtr aJSContext, in JSObjectPtr aJSObj); */
 NS_IMETHODIMP
 nsXPConnect::GetWrappedNativeOfJSObject(JSContext * aJSContext,
                                         JSObject * aJSObjArg,
                                         nsIXPConnectWrappedNative **_retval)
 {
     MOZ_ASSERT(aJSContext, "bad param");
     MOZ_ASSERT(aJSObjArg, "bad param");
     MOZ_ASSERT(_retval, "bad param");
     RootedObject aJSObj(aJSContext, aJSObjArg);
     aJSObj = js::CheckedUnwrap(aJSObj, /* stopAtOuter = */ false);
     if (!aJSObj || !IS_WN_REFLECTOR(aJSObj)) {
         *_retval = nullptr;
         return NS_ERROR_FAILURE;
     }
     nsRefPtr<XPCWrappedNative> temp = XPCWrappedNative::Get(aJSObj);
     temp.forget(_retval);
     return NS_OK;
 }
 /* nsISupports getNativeOfWrapper(in JSContextPtr aJSContext, in JSObjectPtr  aJSObj); */
 NS_IMETHODIMP_(nsISupports*)
 nsXPConnect::GetNativeOfWrapper(JSContext *aJSContext,
                                 JSObject *aJSObj)
 {
     MOZ_ASSERT(aJSContext, "bad param");
     MOZ_ASSERT(aJSObj, "bad param");
     aJSObj = js::CheckedUnwrap(aJSObj, /* stopAtOuter = */ false);
     if (!aJSObj) {
         JS_ReportError(aJSContext, "Permission denied to get native of security wrapper");
         return nullptr;
     }
     if (IS_WN_REFLECTOR(aJSObj)) {
         if (XPCWrappedNative *wn = XPCWrappedNative::Get(aJSObj))
             return wn->Native();
         return nullptr;
     }
     nsCOMPtr<nsISupports> canonical =
         do_QueryInterface(mozilla::dom::UnwrapDOMObjectToISupports(aJSObj));
     return canonical;
 }
 /* nsIXPConnectWrappedNative getWrappedNativeOfNativeObject (in JSContextPtr aJSContext, in JSObjectPtr aScope, in nsISupports aCOMObj, in nsIIDRef aIID); */
 NS_IMETHODIMP
 nsXPConnect::GetWrappedNativeOfNativeObject(JSContext * aJSContext,
                                             JSObject * aScopeArg,
                                             nsISupports *aCOMObj,
                                             const nsIID & aIID,
                                             nsIXPConnectWrappedNative **_retval)
 {
     MOZ_ASSERT(aJSContext, "bad param");
     MOZ_ASSERT(aScopeArg, "bad param");
     MOZ_ASSERT(aCOMObj, "bad param");
     MOZ_ASSERT(_retval, "bad param");
     *_retval = nullptr;
     RootedObject aScope(aJSContext, aScopeArg);
     XPCWrappedNativeScope* scope = GetObjectScope(aScope);
     if (!scope)
         return UnexpectedFailure(NS_ERROR_FAILURE);
     AutoMarkingNativeInterfacePtr iface(aJSContext);
     iface = XPCNativeInterface::GetNewOrUsed(&aIID);
     if (!iface)
         return NS_ERROR_FAILURE;
     XPCWrappedNative* wrapper;
     nsresult rv = XPCWrappedNative::GetUsedOnly(aCOMObj, scope, iface, &wrapper);
     if (NS_FAILED(rv))
         return NS_ERROR_FAILURE;
     *_retval = static_cast<nsIXPConnectWrappedNative*>(wrapper);
     return NS_OK;
 }
 /* void reparentWrappedNativeIfFound (in JSContextPtr aJSContext,
  *                                    in JSObjectPtr aScope,
  *                                    in JSObjectPtr aNewParent,
  *                                    in nsISupports aCOMObj); */
 NS_IMETHODIMP
 nsXPConnect::ReparentWrappedNativeIfFound(JSContext * aJSContext,
                                           JSObject * aScopeArg,
                                           JSObject * aNewParentArg,
                                           nsISupports *aCOMObj)
 {
     RootedObject aScope(aJSContext, aScopeArg);
     RootedObject aNewParent(aJSContext, aNewParentArg);
     XPCWrappedNativeScope* scope = GetObjectScope(aScope);
     XPCWrappedNativeScope* scope2 = GetObjectScope(aNewParent);
     if (!scope || !scope2)
         return UnexpectedFailure(NS_ERROR_FAILURE);
     RootedObject newParent(aJSContext, aNewParent);
     return XPCWrappedNative::
         ReparentWrapperIfFound(scope, scope2, newParent, aCOMObj);
 }
 static PLDHashOperator
 MoveableWrapperFinder(PLDHashTable *table, PLDHashEntryHdr *hdr,
                       uint32_t number, void *arg)
 {
     nsTArray<nsRefPtr<XPCWrappedNative> > *array =
         static_cast<nsTArray<nsRefPtr<XPCWrappedNative> > *>(arg);
     XPCWrappedNative *wn = ((Native2WrappedNativeMap::Entry*)hdr)->value;
     // If a wrapper is expired, then there are no references to it from JS, so
     // we don't have to move it.
     if (!wn->IsWrapperExpired())
         array->AppendElement(wn);
     return PL_DHASH_NEXT;
 }
 /* void rescueOrphansInScope(in JSContextPtr aJSContext, in JSObjectPtr  aScope); */
 NS_IMETHODIMP
 nsXPConnect::RescueOrphansInScope(JSContext *aJSContext, JSObject *aScopeArg)
 {
     RootedObject aScope(aJSContext, aScopeArg);
     XPCWrappedNativeScope *scope = GetObjectScope(aScope);
     if (!scope)
         return UnexpectedFailure(NS_ERROR_FAILURE);
     // First, look through the old scope and find all of the wrappers that we
     // might need to rescue.
     nsTArray<nsRefPtr<XPCWrappedNative> > wrappersToMove;
     Native2WrappedNativeMap *map = scope->GetWrappedNativeMap();
     wrappersToMove.SetCapacity(map->Count());
     map->Enumerate(MoveableWrapperFinder, &wrappersToMove);
     // Now that we have the wrappers, reparent them to the new scope.
     for (uint32_t i = 0, stop = wrappersToMove.Length(); i < stop; ++i) {
         nsresult rv = wrappersToMove[i]->RescueOrphans();
         NS_ENSURE_SUCCESS(rv, rv);
     }
     return NS_OK;
 }
 /* void setDefaultSecurityManager (in nsIXPCSecurityManager aManager); */
 NS_IMETHODIMP
 nsXPConnect::SetDefaultSecurityManager(nsIXPCSecurityManager *aManager)
 {
     mDefaultSecurityManager = aManager;
     nsCOMPtr<nsIScriptSecurityManager> ssm =
         do_QueryInterface(mDefaultSecurityManager);
     // Remember the result of the above QI for fast access to the
     // script securityt manager.
     gScriptSecurityManager = ssm;
     return NS_OK;
 }
 /* nsIStackFrame createStackFrameLocation (in uint32_t aLanguage, in string aFilename, in string aFunctionName, in int32_t aLineNumber, in nsIStackFrame aCaller); */
 NS_IMETHODIMP
 nsXPConnect::CreateStackFrameLocation(uint32_t aLanguage,
                                       const char *aFilename,
                                       const char *aFunctionName,
                                       int32_t aLineNumber,
                                       nsIStackFrame *aCaller,
                                       nsIStackFrame **_retval)
 {
     MOZ_ASSERT(_retval, "bad param");
     nsCOMPtr<nsIStackFrame> stackFrame =
         exceptions::CreateStackFrameLocation(aLanguage,
                                              aFilename,
                                              aFunctionName,
                                              aLineNumber,
                                              aCaller);
     stackFrame.forget(_retval);
     return NS_OK;
 }
 /* readonly attribute nsIStackFrame CurrentJSStack; */
 NS_IMETHODIMP
 nsXPConnect::GetCurrentJSStack(nsIStackFrame * *aCurrentJSStack)
 {
     MOZ_ASSERT(aCurrentJSStack, "bad param");
     nsCOMPtr<nsIStackFrame> currentStack = dom::GetCurrentJSStack();
     currentStack.forget(aCurrentJSStack);
     return NS_OK;
 }
 /* readonly attribute nsIXPCNativeCallContext CurrentNativeCallContext; */
 NS_IMETHODIMP
 nsXPConnect::GetCurrentNativeCallContext(nsAXPCNativeCallContext * *aCurrentNativeCallContext)
 {
     MOZ_ASSERT(aCurrentNativeCallContext, "bad param");
     *aCurrentNativeCallContext = XPCJSRuntime::Get()->GetCallContext();
     return NS_OK;
 }
 /* void setFunctionThisTranslator (in nsIIDRef aIID, in nsIXPCFunctionThisTranslator aTranslator); */
 NS_IMETHODIMP
 nsXPConnect::SetFunctionThisTranslator(const nsIID & aIID,
                                        nsIXPCFunctionThisTranslator *aTranslator)
 {
     XPCJSRuntime* rt = GetRuntime();
     IID2ThisTranslatorMap* map = rt->GetThisTranslatorMap();
     map->Add(aIID, aTranslator);
     return NS_OK;
 }
 NS_IMETHODIMP
 nsXPConnect::CreateSandbox(JSContext *cx, nsIPrincipal *principal,
                            nsIXPConnectJSObjectHolder **_retval)
 {
     *_retval = nullptr;
     RootedValue rval(cx);
     SandboxOptions options;
     nsresult rv = CreateSandboxObject(cx, &rval, principal, options);
     MOZ_ASSERT(NS_FAILED(rv) || !JSVAL_IS_PRIMITIVE(rval),
                "Bad return value from xpc_CreateSandboxObject()!");
     if (NS_SUCCEEDED(rv) && !JSVAL_IS_PRIMITIVE(rval)) {
         *_retval = XPCJSObjectHolder::newHolder(JSVAL_TO_OBJECT(rval));
         NS_ENSURE_TRUE(*_retval, NS_ERROR_OUT_OF_MEMORY);
         NS_ADDREF(*_retval);
     }
     return rv;
 }
 NS_IMETHODIMP
 nsXPConnect::EvalInSandboxObject(const nsAString& source, const char *filename,
                                  JSContext *cx, JSObject *sandboxArg,
                                  bool returnStringOnly, MutableHandleValue rval)
 {
     if (!sandboxArg)
         return NS_ERROR_INVALID_ARG;
     RootedObject sandbox(cx, sandboxArg);
     nsCString filenameStr;
     if (filename) {
         filenameStr.Assign(filename);
     } else {
         filenameStr = NS_LITERAL_CSTRING("x-bogus://XPConnect/Sandbox");
     }
     return EvalInSandbox(cx, sandbox, source, filenameStr, 1,
                          JSVERSION_DEFAULT, returnStringOnly, rval);
 }
 /* nsIXPConnectJSObjectHolder getWrappedNativePrototype (in JSContextPtr aJSContext, in JSObjectPtr aScope, in nsIClassInfo aClassInfo); */
 NS_IMETHODIMP
 nsXPConnect::GetWrappedNativePrototype(JSContext * aJSContext,
                                        JSObject * aScopeArg,
                                        nsIClassInfo *aClassInfo,
                                        nsIXPConnectJSObjectHolder **_retval)
 {
     RootedObject aScope(aJSContext, aScopeArg);
     JSAutoCompartment ac(aJSContext, aScope);
     XPCWrappedNativeScope* scope = GetObjectScope(aScope);
     if (!scope)
         return UnexpectedFailure(NS_ERROR_FAILURE);
     XPCNativeScriptableCreateInfo sciProto;
     XPCWrappedNative::GatherProtoScriptableCreateInfo(aClassInfo, sciProto);
     AutoMarkingWrappedNativeProtoPtr proto(aJSContext);
     proto = XPCWrappedNativeProto::GetNewOrUsed(scope, aClassInfo, &sciProto);
     if (!proto)
         return UnexpectedFailure(NS_ERROR_FAILURE);
     nsIXPConnectJSObjectHolder* holder;
     *_retval = holder = XPCJSObjectHolder::newHolder(proto->GetJSProtoObject());
     if (!holder)
         return UnexpectedFailure(NS_ERROR_FAILURE);
     NS_ADDREF(holder);
     return NS_OK;
 }
 /* void debugDump (in short depth); */
 NS_IMETHODIMP
 nsXPConnect::DebugDump(int16_t depth)
 {
 #ifdef DEBUG
     depth-- ;
     XPC_LOG_ALWAYS(("nsXPConnect @ %x with mRefCnt = %d", this, mRefCnt.get()));
     XPC_LOG_INDENT();
         XPC_LOG_ALWAYS(("gSelf @ %x", gSelf));
         XPC_LOG_ALWAYS(("gOnceAliveNowDead is %d", (int)gOnceAliveNowDead));
         XPC_LOG_ALWAYS(("mDefaultSecurityManager @ %x", mDefaultSecurityManager.get()));
         if (mRuntime) {
             if (depth)
                 mRuntime->DebugDump(depth);
             else
                 XPC_LOG_ALWAYS(("XPCJSRuntime @ %x", mRuntime));
         } else
             XPC_LOG_ALWAYS(("mRuntime is null"));
         XPCWrappedNativeScope::DebugDumpAllScopes(depth);
     XPC_LOG_OUTDENT();
 #endif
     return NS_OK;
 }
 /* void debugDumpObject (in nsISupports aCOMObj, in short depth); */
 NS_IMETHODIMP
 nsXPConnect::DebugDumpObject(nsISupports *p, int16_t depth)
 {
 #ifdef DEBUG
     if (!depth)
         return NS_OK;
     if (!p) {
         XPC_LOG_ALWAYS(("*** Cound not dump object with NULL address"));
         return NS_OK;
     }
     nsIXPConnect* xpc;
     nsIXPCWrappedJSClass* wjsc;
     nsIXPConnectWrappedNative* wn;
     nsIXPConnectWrappedJS* wjs;
     if (NS_SUCCEEDED(p->QueryInterface(NS_GET_IID(nsIXPConnect),
                                        (void**)&xpc))) {
         XPC_LOG_ALWAYS(("Dumping a nsIXPConnect..."));
         xpc->DebugDump(depth);
         NS_RELEASE(xpc);
     } else if (NS_SUCCEEDED(p->QueryInterface(NS_GET_IID(nsIXPCWrappedJSClass),
                                               (void**)&wjsc))) {
         XPC_LOG_ALWAYS(("Dumping a nsIXPCWrappedJSClass..."));
         wjsc->DebugDump(depth);
         NS_RELEASE(wjsc);
     } else if (NS_SUCCEEDED(p->QueryInterface(NS_GET_IID(nsIXPConnectWrappedNative),
                                               (void**)&wn))) {
         XPC_LOG_ALWAYS(("Dumping a nsIXPConnectWrappedNative..."));
         wn->DebugDump(depth);
         NS_RELEASE(wn);
     } else if (NS_SUCCEEDED(p->QueryInterface(NS_GET_IID(nsIXPConnectWrappedJS),
                                               (void**)&wjs))) {
         XPC_LOG_ALWAYS(("Dumping a nsIXPConnectWrappedJS..."));
         wjs->DebugDump(depth);
         NS_RELEASE(wjs);
     } else
         XPC_LOG_ALWAYS(("*** Could not dump the nsISupports @ %x", p));
 #endif
     return NS_OK;
 }
 /* void debugDumpJSStack (in bool showArgs, in bool showLocals, in bool showThisProps); */
 NS_IMETHODIMP
 nsXPConnect::DebugDumpJSStack(bool showArgs,
                               bool showLocals,
                               bool showThisProps)
 {
     JSContext* cx = GetCurrentJSContext();
     if (!cx)
         printf("there is no JSContext on the nsIThreadJSContextStack!\n");
     else
         xpc_DumpJSStack(cx, showArgs, showLocals, showThisProps);
     return NS_OK;
 }
 char*
 nsXPConnect::DebugPrintJSStack(bool showArgs,
                                bool showLocals,
                                bool showThisProps)
 {
     JSContext* cx = GetCurrentJSContext();
     if (!cx)
         printf("there is no JSContext on the nsIThreadJSContextStack!\n");
     else
         return xpc_PrintJSStack(cx, showArgs, showLocals, showThisProps);
     return nullptr;
 }
 /* void debugDumpEvalInJSStackFrame (in uint32_t aFrameNumber, in string aSourceText); */
 NS_IMETHODIMP
 nsXPConnect::DebugDumpEvalInJSStackFrame(uint32_t aFrameNumber, const char *aSourceText)
 {
     JSContext* cx = GetCurrentJSContext();
     if (!cx)
         printf("there is no JSContext on the nsIThreadJSContextStack!\n");
     else
         xpc_DumpEvalInJSStackFrame(cx, aFrameNumber, aSourceText);
     return NS_OK;
 }
 /* jsval variantToJS (in JSContextPtr ctx, in JSObjectPtr scope, in nsIVariant value); */
 NS_IMETHODIMP
 nsXPConnect::VariantToJS(JSContext* ctx, JSObject* scopeArg, nsIVariant* value,
                          MutableHandleValue _retval)
 {
     NS_PRECONDITION(ctx, "bad param");
     NS_PRECONDITION(scopeArg, "bad param");
     NS_PRECONDITION(value, "bad param");
     RootedObject scope(ctx, scopeArg);
     MOZ_ASSERT(js::IsObjectInContextCompartment(scope, ctx));
     nsresult rv = NS_OK;
     if (!XPCVariant::VariantDataToJS(value, &rv, _retval)) {
         if (NS_FAILED(rv))
             return rv;
         return NS_ERROR_FAILURE;
     }
     return NS_OK;
 }
 /* nsIVariant JSToVariant (in JSContextPtr ctx, in jsval value); */
 NS_IMETHODIMP
 nsXPConnect::JSToVariant(JSContext* ctx, HandleValue value, nsIVariant** _retval)
 {
     NS_PRECONDITION(ctx, "bad param");
     NS_PRECONDITION(_retval, "bad param");
     nsRefPtr<XPCVariant> variant = XPCVariant::newVariant(ctx, value);
     variant.forget(_retval);
     if (!(*_retval))
         return NS_ERROR_FAILURE;
     return NS_OK;
 }
 NS_IMETHODIMP
 nsXPConnect::OnProcessNextEvent(nsIThreadInternal *aThread, bool aMayWait,
                                 uint32_t aRecursionDepth)
 {
     // Record this event.
     mEventDepth++;
     // Push a null JSContext so that we don't see any script during
     // event processing.
     MOZ_ASSERT(NS_IsMainThread());
     bool ok = PushJSContextNoScriptContext(nullptr);
     NS_ENSURE_TRUE(ok, NS_ERROR_FAILURE);
     return NS_OK;
 }
 NS_IMETHODIMP
 nsXPConnect::AfterProcessNextEvent(nsIThreadInternal *aThread,
                                    uint32_t aRecursionDepth,
                                    bool aEventWasProcessed)
 {
     // Watch out for unpaired events during observer registration.
     if (MOZ_UNLIKELY(mEventDepth == 0))
         return NS_OK;
     mEventDepth--;
     // Now that we're back to the event loop, reset the slow script checkpoint.
     mRuntime->OnAfterProcessNextEvent();
     // Call cycle collector occasionally.
     MOZ_ASSERT(NS_IsMainThread());
     nsJSContext::MaybePokeCC();
     nsDOMMutationObserver::HandleMutations();
     PopJSContextNoScriptContext();
     // If the cx stack is empty, that means we're at the an un-nested event
     // loop. This is a good time to make changes to debug mode.
     if (XPCJSRuntime::Get()->GetJSContextStack()->Count() == 0) {
         MOZ_ASSERT(mEventDepth == 0);
         CheckForDebugMode(XPCJSRuntime::Get()->Runtime());
     }
     return NS_OK;
 }
 NS_IMETHODIMP
 nsXPConnect::OnDispatchedEvent(nsIThreadInternal* aThread)
 {
     NS_NOTREACHED("Why tell us?");
     return NS_ERROR_UNEXPECTED;
 }
 NS_IMETHODIMP
 nsXPConnect::SetReportAllJSExceptions(bool newval)
 {
     // Ignore if the environment variable was set.
     if (gReportAllJSExceptions != 1)
         gReportAllJSExceptions = newval ? 2 : 0;
     return NS_OK;
 }
 /* attribute JSRuntime runtime; */
 NS_IMETHODIMP
 nsXPConnect::GetRuntime(JSRuntime **runtime)
 {
     if (!runtime)
         return NS_ERROR_NULL_POINTER;
     JSRuntime *rt = GetRuntime()->Runtime();
     JS_AbortIfWrongThread(rt);
     *runtime = rt;
     return NS_OK;
 }
 /* [noscript, notxpcom] void registerGCCallback(in xpcGCCallback func); */
 NS_IMETHODIMP_(void)
 nsXPConnect::RegisterGCCallback(xpcGCCallback func)
 {
     mRuntime->AddGCCallback(func);
 }
 /* [noscript, notxpcom] void unregisterGCCallback(in xpcGCCallback func); */
 NS_IMETHODIMP_(void)
 nsXPConnect::UnregisterGCCallback(xpcGCCallback func)
 {
     mRuntime->RemoveGCCallback(func);
 }
 /* [noscript, notxpcom] void registerContextCallback(in xpcContextCallback func); */
 NS_IMETHODIMP_(void)
 nsXPConnect::RegisterContextCallback(xpcContextCallback func)
 {
     mRuntime->AddContextCallback(func);
 }
 /* [noscript, notxpcom] void unregisterContextCallback(in xpcContextCallback func); */
 NS_IMETHODIMP_(void)
 nsXPConnect::UnregisterContextCallback(xpcContextCallback func)
 {
     mRuntime->RemoveContextCallback(func);
 }
 #ifdef MOZ_JSDEBUGGER
 void
 nsXPConnect::CheckForDebugMode(JSRuntime *rt)
 {
     if (gDebugMode == gDesiredDebugMode) {
         return;
     }
     // This can happen if a Worker is running, but we don't have the ability to
     // debug workers right now, so just return.
     if (!NS_IsMainThread())
         MOZ_CRASH();
     AutoSafeJSContext cx;
     JS_SetRuntimeDebugMode(rt, gDesiredDebugMode);
     nsresult rv;
     const char jsdServiceCtrID[] = "@mozilla.org/js/jsd/debugger-service;1";
     nsCOMPtr<jsdIDebuggerService> jsds = do_GetService(jsdServiceCtrID, &rv);
     if (NS_FAILED(rv)) {
         goto fail;
     }
     if (!JS_SetDebugModeForAllCompartments(cx, gDesiredDebugMode))
         goto fail;
     if (gDesiredDebugMode) {
         rv = jsds->ActivateDebugger(rt);
     }
     gDebugMode = gDesiredDebugMode;
     return;
 fail:
     if (jsds)
         jsds->DeactivateDebugger();
     /*
      * If an attempt to turn debug mode on fails, cancel the request. It's
      * always safe to turn debug mode off, since DeactivateDebugger prevents
      * debugger callbacks from having any effect.
      */
     if (gDesiredDebugMode)
         JS_SetRuntimeDebugMode(rt, false);
     gDesiredDebugMode = gDebugMode = false;
 }
 #else //MOZ_JSDEBUGGER not defined
 void
 nsXPConnect::CheckForDebugMode(JSRuntime *rt)
 {
     gDesiredDebugMode = gDebugMode = false;
 }
 #endif //#ifdef MOZ_JSDEBUGGER
 void
 xpc_ActivateDebugMode()
 {
     XPCJSRuntime* rt = nsXPConnect::GetRuntimeInstance();
     nsXPConnect::XPConnect()->SetDebugModeWhenPossible(true, true);
     nsXPConnect::CheckForDebugMode(rt->Runtime());
 }
 /* virtual */
 JSContext*
 nsXPConnect::GetCurrentJSContext()
 {
     return GetRuntime()->GetJSContextStack()->Peek();
 }
 /* virtual */
 JSContext*
 nsXPConnect::InitSafeJSContext()
 {
     return GetRuntime()->GetJSContextStack()->InitSafeJSContext();
 }
 /* virtual */
 JSContext*
 nsXPConnect::GetSafeJSContext()
 {
     return GetRuntime()->GetJSContextStack()->GetSafeJSContext();
 }
 namespace xpc {
 bool
 PushJSContextNoScriptContext(JSContext *aCx)
 {
     MOZ_ASSERT_IF(aCx, !GetScriptContextFromJSContext(aCx));
     return XPCJSRuntime::Get()->GetJSContextStack()->Push(aCx);
 }
 void
 PopJSContextNoScriptContext()
 {
     XPCJSRuntime::Get()->GetJSContextStack()->Pop();
 }
 } // namespace xpc
 nsIPrincipal*
 nsXPConnect::GetPrincipal(JSObject* obj, bool allowShortCircuit) const
 {
     MOZ_ASSERT(IS_WN_REFLECTOR(obj), "What kind of wrapper is this?");
     XPCWrappedNative *xpcWrapper = XPCWrappedNative::Get(obj);
     if (xpcWrapper) {
         if (allowShortCircuit) {
             nsIPrincipal *result = xpcWrapper->GetObjectPrincipal();
             if (result) {
                 return result;
             }
         }
         // If not, check if it points to an nsIScriptObjectPrincipal
         nsCOMPtr<nsIScriptObjectPrincipal> objPrin =
             do_QueryInterface(xpcWrapper->Native());
         if (objPrin) {
             nsIPrincipal *result = objPrin->GetPrincipal();
             if (result) {
                 return result;
             }
         }
     }
     return nullptr;
 }
 NS_IMETHODIMP
 nsXPConnect::HoldObject(JSContext *aJSContext, JSObject *aObjectArg,
                         nsIXPConnectJSObjectHolder **aHolder)
 {
     RootedObject aObject(aJSContext, aObjectArg);
     XPCJSObjectHolder* objHolder = XPCJSObjectHolder::newHolder(aObject);
     if (!objHolder)
         return NS_ERROR_OUT_OF_MEMORY;
     NS_ADDREF(*aHolder = objHolder);
     return NS_OK;
 }
 namespace xpc {
 bool
 Base64Encode(JSContext *cx, HandleValue val, MutableHandleValue out)
 {
     MOZ_ASSERT(cx);
     JS::RootedValue root(cx, val);
     xpc_qsACString encodedString(cx, root, &root, false,
                                  xpc_qsACString::eStringify,
                                  xpc_qsACString::eStringify);
     if (!encodedString.IsValid())
         return false;
     nsAutoCString result;
     if (NS_FAILED(mozilla::Base64Encode(encodedString, result))) {
         JS_ReportError(cx, "Failed to encode base64 data!");
         return false;
     }
     JSString *str = JS_NewStringCopyN(cx, result.get(), result.Length());
     if (!str)
         return false;
     out.setString(str);
     return true;
 }
 bool
 Base64Decode(JSContext *cx, HandleValue val, MutableHandleValue out)
 {
     MOZ_ASSERT(cx);
     JS::RootedValue root(cx, val);
     xpc_qsACString encodedString(cx, root, &root, false,
                                  xpc_qsACString::eStringify,
                                  xpc_qsACString::eStringify);
     if (!encodedString.IsValid())
         return false;
     nsAutoCString result;
     if (NS_FAILED(mozilla::Base64Decode(encodedString, result))) {
         JS_ReportError(cx, "Failed to decode base64 string!");
         return false;
     }
     JSString *str = JS_NewStringCopyN(cx, result.get(), result.Length());
     if (!str)
         return false;
     out.setString(str);
     return true;
 }
 void
 SetLocationForGlobal(JSObject *global, const nsACString& location)
 {
     MOZ_ASSERT(global);
     EnsureCompartmentPrivate(global)->SetLocation(location);
 }
 void
 SetLocationForGlobal(JSObject *global, nsIURI *locationURI)
 {
     MOZ_ASSERT(global);
     EnsureCompartmentPrivate(global)->SetLocationURI(locationURI);
 }
 } // namespace xpc
 NS_IMETHODIMP
 nsXPConnect::SetDebugModeWhenPossible(bool mode, bool allowSyncDisable)
 {
     gDesiredDebugMode = mode;
     if (!mode && allowSyncDisable)
         CheckForDebugMode(mRuntime->Runtime());
     return NS_OK;
 }
 NS_IMETHODIMP
 nsXPConnect::NotifyDidPaint()
 {
     JS::NotifyDidPaint(GetRuntime()->Runtime());
     return NS_OK;
 }
 // Note - We used to have HAS_PRINCIPALS_FLAG = 1 here, so reusing that flag
 // will require bumping the XDR version number.
 static const uint8_t HAS_ORIGIN_PRINCIPALS_FLAG        = 2;
 static nsresult
 WriteScriptOrFunction(nsIObjectOutputStream *stream, JSContext *cx,
                       JSScript *scriptArg, HandleObject functionObj)
 {
     // Exactly one of script or functionObj must be given
     MOZ_ASSERT(!scriptArg != !functionObj);
     RootedScript script(cx, scriptArg);
     if (!script) {
         RootedFunction fun(cx, JS_GetObjectFunction(functionObj));
         script.set(JS_GetFunctionScript(cx, fun));
     }
     nsIPrincipal *principal =
         nsJSPrincipals::get(JS_GetScriptPrincipals(script));
     nsIPrincipal *originPrincipal =
         nsJSPrincipals::get(JS_GetScriptOriginPrincipals(script));
     uint8_t flags = 0;
     // Optimize for the common case when originPrincipals == principals. As
     // originPrincipals is set to principals when the former is null we can
     // simply skip the originPrincipals when they are the same as principals.
     if (originPrincipal && originPrincipal != principal)
         flags |= HAS_ORIGIN_PRINCIPALS_FLAG;
     nsresult rv = stream->Write8(flags);
     if (NS_FAILED(rv))
         return rv;
     if (flags & HAS_ORIGIN_PRINCIPALS_FLAG) {
         rv = stream->WriteObject(originPrincipal, true);
         if (NS_FAILED(rv))
             return rv;
     }
     uint32_t size;
     void* data;
     {
         if (functionObj)
             data = JS_EncodeInterpretedFunction(cx, functionObj, &size);
         else
             data = JS_EncodeScript(cx, script, &size);
     }
     if (!data)
         return NS_ERROR_OUT_OF_MEMORY;
     MOZ_ASSERT(size);
     rv = stream->Write32(size);
     if (NS_SUCCEEDED(rv))
         rv = stream->WriteBytes(static_cast<char *>(data), size);
     js_free(data);
     return rv;
 }
 static nsresult
 ReadScriptOrFunction(nsIObjectInputStream *stream, JSContext *cx,
                      JSScript **scriptp, JSObject **functionObjp)
 {
     // Exactly one of script or functionObj must be given
     MOZ_ASSERT(!scriptp != !functionObjp);
     uint8_t flags;
     nsresult rv = stream->Read8(&flags);
     if (NS_FAILED(rv))
         return rv;
     nsJSPrincipals* originPrincipal = nullptr;
     nsCOMPtr<nsIPrincipal> readOriginPrincipal;
     if (flags & HAS_ORIGIN_PRINCIPALS_FLAG) {
         nsCOMPtr<nsISupports> supports;
         rv = stream->ReadObject(true, getter_AddRefs(supports));
         if (NS_FAILED(rv))
             return rv;
         readOriginPrincipal = do_QueryInterface(supports);
         originPrincipal = nsJSPrincipals::get(readOriginPrincipal);
     }
     uint32_t size;
     rv = stream->Read32(&size);
     if (NS_FAILED(rv))
         return rv;
     char* data;
     rv = stream->ReadBytes(size, &data);
     if (NS_FAILED(rv))
         return rv;
     {
         if (scriptp) {
             JSScript *script = JS_DecodeScript(cx, data, size, originPrincipal);
             if (!script)
                 rv = NS_ERROR_OUT_OF_MEMORY;
             else
                 *scriptp = script;
         } else {
             JSObject *funobj = JS_DecodeInterpretedFunction(cx, data, size,
                                                             originPrincipal);
             if (!funobj)
                 rv = NS_ERROR_OUT_OF_MEMORY;
             else
                 *functionObjp = funobj;
         }
     }
     nsMemory::Free(data);
     return rv;
 }
 NS_IMETHODIMP
 nsXPConnect::WriteScript(nsIObjectOutputStream *stream, JSContext *cx, JSScript *script)
 {
     return WriteScriptOrFunction(stream, cx, script, NullPtr());
 }
 NS_IMETHODIMP
 nsXPConnect::ReadScript(nsIObjectInputStream *stream, JSContext *cx, JSScript **scriptp)
 {
     return ReadScriptOrFunction(stream, cx, scriptp, nullptr);
 }
 NS_IMETHODIMP
 nsXPConnect::WriteFunction(nsIObjectOutputStream *stream, JSContext *cx, JSObject *functionObjArg)
 {
     RootedObject functionObj(cx, functionObjArg);
     return WriteScriptOrFunction(stream, cx, nullptr, functionObj);
 }
 NS_IMETHODIMP
 nsXPConnect::ReadFunction(nsIObjectInputStream *stream, JSContext *cx, JSObject **functionObjp)
 {
     return ReadScriptOrFunction(stream, cx, nullptr, functionObjp);
 }
 NS_IMETHODIMP
 nsXPConnect::MarkErrorUnreported(JSContext *cx)
 {
     XPCContext *xpcc = XPCContext::GetXPCContext(cx);
     xpcc->MarkErrorUnreported();
     return NS_OK;
 }
 /* These are here to be callable from a debugger */
 extern "C" {
 JS_EXPORT_API(void) DumpJSStack()
 {
     nsresult rv;
     nsCOMPtr<nsIXPConnect> xpc(do_GetService(nsIXPConnect::GetCID(), &rv));
     if (NS_SUCCEEDED(rv) && xpc)
         xpc->DebugDumpJSStack(true, true, false);
     else
         printf("failed to get XPConnect service!\n");
 }
 JS_EXPORT_API(char*) PrintJSStack()
 {
     nsresult rv;
     nsCOMPtr<nsIXPConnect> xpc(do_GetService(nsIXPConnect::GetCID(), &rv));
     return (NS_SUCCEEDED(rv) && xpc) ?
         xpc->DebugPrintJSStack(true, true, false) :
         nullptr;
 }
 JS_EXPORT_API(void) DumpJSEval(uint32_t frameno, const char* text)
 {
     nsresult rv;
     nsCOMPtr<nsIXPConnect> xpc(do_GetService(nsIXPConnect::GetCID(), &rv));
     if (NS_SUCCEEDED(rv) && xpc)
         xpc->DebugDumpEvalInJSStackFrame(frameno, text);
     else
         printf("failed to get XPConnect service!\n");
 }
 JS_EXPORT_API(void) DumpCompleteHeap()
 {
     nsCOMPtr<nsICycleCollectorListener> listener =
       do_CreateInstance("@mozilla.org/cycle-collector-logger;1");
     if (!listener) {
       NS_WARNING("Failed to create CC logger");
       return;
     }
     nsCOMPtr<nsICycleCollectorListener> alltracesListener;
     listener->AllTraces(getter_AddRefs(alltracesListener));
     if (!alltracesListener) {
       NS_WARNING("Failed to get all traces logger");
       return;
     }
     nsJSContext::CycleCollectNow(alltracesListener);
 }
 } // extern "C"
 namespace xpc {
 bool
 Atob(JSContext *cx, unsigned argc, Value *vp)
 {
     CallArgs args = CallArgsFromVp(argc, vp);
     if (!args.length())
         return true;
     return xpc::Base64Decode(cx, args[0], args.rval());
 }
 bool
 Btoa(JSContext *cx, unsigned argc, Value *vp)
 {
     CallArgs args = CallArgsFromVp(argc, vp);
     if (!args.length())
         return true;
     return xpc::Base64Encode(cx, args[0], args.rval());
 }
 bool
 IsXrayWrapper(JSObject *obj)
 {
     return WrapperFactory::IsXrayWrapper(obj);
 }
 } // namespace xpc
 namespace mozilla {
 namespace dom {
 bool
 IsChromeOrXBL(JSContext* cx, JSObject* /* unused */)
 {
     MOZ_ASSERT(NS_IsMainThread());
     JSCompartment* c = js::GetContextCompartment(cx);
     // For remote XUL, we run XBL in the XUL scope. Given that we care about
     // compat and not security for remote XUL, we just always claim to be XBL.
     //
     // Note that, for performance, we don't check AllowXULXBLForPrincipal here,
     // and instead rely on the fact that AllowXBLScope() only returns false in
     // remote XUL situations.
     return AccessCheck::isChrome(c) || IsXBLScope(c) || !AllowXBLScope(c);
 }
 } // namespace dom
 } // namespace mozilla

The Tor Browser / annotate

js/xpconnect/src/nsXPConnect.cpp@a63d609f5ebe (annotated)

js/xpconnect/src/nsXPConnect.cpp