JSObject *GetXBLScope(JSContext *cx, JSObject *contentScope)
{
JSAutoCompartment ac(cx, contentScope);
JSObject *scope = EnsureCompartmentPrivate(contentScope)->scope->EnsureXBLScope(cx);
scope = js::UnwrapObject(scope);
xpc_UnmarkGrayObject(scope);
return scope;
}
JSObject *GetXBLScope(JSContext *cx, JSObject *contentScope)
{
JSAutoCompartment ac(cx, contentScope);
JSObject *scope = EnsureCompartmentPrivate(contentScope)->scope->EnsureXBLScope(cx);
NS_ENSURE_TRUE(scope, nullptr); // See bug 858642.
scope = js::UnwrapObject(scope);
xpc_UnmarkGrayObject(scope);
return scope;
}
JSObject *
WrapperFactory::GetXrayWaiver(JSObject *obj)
{
// Object should come fully unwrapped but outerized.
MOZ_ASSERT(obj == UncheckedUnwrap(obj));
MOZ_ASSERT(!js::GetObjectClass(obj)->ext.outerObject);
XPCWrappedNativeScope *scope = GetObjectScope(obj);
MOZ_ASSERT(scope);
if (!scope->mWaiverWrapperMap)
return NULL;
return xpc_UnmarkGrayObject(scope->mWaiverWrapperMap->Find(obj));
}
JSObject *
WrapperFactory::WaiveXray(JSContext *cx, JSObject *obj)
{
obj = UnwrapObject(obj);
// We have to make sure that if we're wrapping an outer window, that
// the .wrappedJSObject also wraps the outer window.
obj = GetCurrentOuter(cx, obj);
{
// See if we already have a waiver wrapper for this object.
CompartmentPrivate *priv =
(CompartmentPrivate *)JS_GetCompartmentPrivate(js::GetObjectCompartment(obj));
JSObject *wobj = nsnull;
if (priv && priv->waiverWrapperMap) {
wobj = priv->waiverWrapperMap->Find(obj);
xpc_UnmarkGrayObject(wobj);
}
// No wrapper yet, make one.
if (!wobj) {
JSObject *proto = js::GetObjectProto(obj);
if (proto && !(proto = WaiveXray(cx, proto)))
return nsnull;
JSAutoEnterCompartment ac;
if (!ac.enter(cx, obj) || !JS_WrapObject(cx, &proto))
return nsnull;
wobj = Wrapper::New(cx, obj, proto, JS_GetGlobalForObject(cx, obj),
&WaiveXrayWrapperWrapper);
if (!wobj)
return nsnull;
// Add the new wrapper so we find it next time.
if (priv) {
if (!priv->waiverWrapperMap) {
priv->waiverWrapperMap = JSObject2JSObjectMap::newMap(XPC_WRAPPER_MAP_SIZE);
if (!priv->waiverWrapperMap)
return nsnull;
}
if (!priv->waiverWrapperMap->Add(obj, wobj))
return nsnull;
}
}
obj = wobj;
}
return obj;
}
JSObject *
XPCWrappedNativeScope::GetPrototypeNoHelper(XPCCallContext& ccx)
{
// We could create this prototype in SetGlobal(), but all scopes
// don't need one, so we save ourselves a bit of space if we
// create these when they're needed.
if (!mPrototypeNoHelper) {
mPrototypeNoHelper =
xpc_NewSystemInheritingJSObject(ccx,
js::Jsvalify(&XPC_WN_NoHelper_Proto_JSClass),
mPrototypeJSObject,
false, mGlobalJSObject);
NS_ASSERTION(mPrototypeNoHelper,
"Failed to create prototype for wrappers w/o a helper");
} else {
xpc_UnmarkGrayObject(mPrototypeNoHelper);
}
return mPrototypeNoHelper;
}
nsresult
nsJSUtils::CompileFunction(JSContext* aCx,
JS::HandleObject aTarget,
JS::CompileOptions& aOptions,
const nsACString& aName,
uint32_t aArgCount,
const char** aArgArray,
const nsAString& aBody,
JSObject** aFunctionObject)
{
MOZ_ASSERT(js::GetEnterCompartmentDepth(aCx) > 0);
MOZ_ASSERT_IF(aTarget, js::IsObjectInContextCompartment(aTarget, aCx));
MOZ_ASSERT_IF(aOptions.versionSet, aOptions.version != JSVERSION_UNKNOWN);
mozilla::DebugOnly<nsIScriptContext*> ctx = GetScriptContextFromJSContext(aCx);
MOZ_ASSERT_IF(ctx, ctx->IsContextInitialized());
// Since aTarget and aCx are same-compartment, there should be no distinction
// between the object principal and the cx principal.
// However, aTarget may be null in the wacky aShared case. So use the cx.
JSPrincipals* p = JS_GetCompartmentPrincipals(js::GetContextCompartment(aCx));
aOptions.setPrincipals(p);
// Do the junk Gecko is supposed to do before calling into JSAPI.
xpc_UnmarkGrayObject(aTarget);
// Compile.
JSFunction* fun = JS::CompileFunction(aCx, aTarget, aOptions,
PromiseFlatCString(aName).get(),
aArgCount, aArgArray,
PromiseFlatString(aBody).get(),
aBody.Length());
if (!fun) {
ReportPendingException(aCx);
return NS_ERROR_FAILURE;
}
*aFunctionObject = JS_GetFunctionObject(fun);
return NS_OK;
}
nsresult
nsJSEventListener::HandleEvent(nsIDOMEvent* aEvent)
{
nsCOMPtr<nsIDOMEventTarget> target = do_QueryInterface(mTarget);
if (!target || !mContext || !mHandler)
return NS_ERROR_FAILURE;
nsresult rv;
nsCOMPtr<nsIMutableArray> iargv;
bool handledScriptError = false;
if (mEventName == nsGkAtoms::onerror) {
nsCOMPtr<nsIPrivateDOMEvent> priv(do_QueryInterface(aEvent));
NS_ENSURE_TRUE(priv, NS_ERROR_UNEXPECTED);
nsEvent *event = priv->GetInternalNSEvent();
if (event->message == NS_LOAD_ERROR &&
event->eventStructType == NS_SCRIPT_ERROR_EVENT) {
nsScriptErrorEvent *scriptEvent =
static_cast<nsScriptErrorEvent*>(event);
// Create a temp argv for the error event.
iargv = do_CreateInstance(NS_ARRAY_CONTRACTID, &rv);
if (NS_FAILED(rv)) return rv;
// Append the event args.
nsCOMPtr<nsIWritableVariant>
var(do_CreateInstance(NS_VARIANT_CONTRACTID, &rv));
NS_ENSURE_SUCCESS(rv, rv);
rv = var->SetAsWString(scriptEvent->errorMsg);
NS_ENSURE_SUCCESS(rv, rv);
rv = iargv->AppendElement(var, false);
NS_ENSURE_SUCCESS(rv, rv);
// filename
var = do_CreateInstance(NS_VARIANT_CONTRACTID, &rv);
NS_ENSURE_SUCCESS(rv, rv);
rv = var->SetAsWString(scriptEvent->fileName);
NS_ENSURE_SUCCESS(rv, rv);
rv = iargv->AppendElement(var, false);
NS_ENSURE_SUCCESS(rv, rv);
// line number
var = do_CreateInstance(NS_VARIANT_CONTRACTID, &rv);
NS_ENSURE_SUCCESS(rv, rv);
rv = var->SetAsUint32(scriptEvent->lineNr);
NS_ENSURE_SUCCESS(rv, rv);
rv = iargv->AppendElement(var, false);
NS_ENSURE_SUCCESS(rv, rv);
handledScriptError = true;
}
}
if (!handledScriptError) {
iargv = do_CreateInstance(NS_ARRAY_CONTRACTID, &rv);
if (NS_FAILED(rv)) return rv;
NS_ENSURE_TRUE(iargv != nsnull, NS_ERROR_OUT_OF_MEMORY);
rv = iargv->AppendElement(aEvent, false);
NS_ENSURE_SUCCESS(rv, rv);
}
// mContext is the same context which event listener manager pushes
// to JS context stack.
#ifdef NS_DEBUG
JSContext* cx = nsnull;
nsCOMPtr<nsIJSContextStack> stack =
do_GetService("@mozilla.org/js/xpc/ContextStack;1");
NS_ASSERTION(stack && NS_SUCCEEDED(stack->Peek(&cx)) && cx &&
GetScriptContextFromJSContext(cx) == mContext,
"JSEventListener has wrong script context?");
#endif
nsCOMPtr<nsIVariant> vrv;
xpc_UnmarkGrayObject(mScopeObject);
xpc_UnmarkGrayObject(mHandler);
rv = mContext->CallEventHandler(mTarget, mScopeObject, mHandler, iargv,
getter_AddRefs(vrv));
if (NS_SUCCEEDED(rv)) {
PRUint16 dataType = nsIDataType::VTYPE_VOID;
if (vrv)
vrv->GetDataType(&dataType);
if (mEventName == nsGkAtoms::onbeforeunload) {
nsCOMPtr<nsIDOMBeforeUnloadEvent> beforeUnload = do_QueryInterface(aEvent);
NS_ENSURE_STATE(beforeUnload);
if (dataType != nsIDataType::VTYPE_VOID) {
aEvent->PreventDefault();
nsAutoString text;
beforeUnload->GetReturnValue(text);
// Set the text in the beforeUnload event as long as it wasn't
// already set (through event.returnValue, which takes
// precedence over a value returned from a JS function in IE)
if ((dataType == nsIDataType::VTYPE_DOMSTRING ||
dataType == nsIDataType::VTYPE_CHAR_STR ||
dataType == nsIDataType::VTYPE_WCHAR_STR ||
dataType == nsIDataType::VTYPE_STRING_SIZE_IS ||
dataType == nsIDataType::VTYPE_WSTRING_SIZE_IS ||
dataType == nsIDataType::VTYPE_CSTRING ||
dataType == nsIDataType::VTYPE_ASTRING)
&& text.IsEmpty()) {
vrv->GetAsDOMString(text);
beforeUnload->SetReturnValue(text);
}
}
} else if (dataType == nsIDataType::VTYPE_BOOL) {
// If the handler returned false and its sense is not reversed,
// or the handler returned true and its sense is reversed from
// the usual (false means cancel), then prevent default.
bool brv;
if (NS_SUCCEEDED(vrv->GetAsBool(&brv)) &&
brv == (mEventName == nsGkAtoms::onerror ||
mEventName == nsGkAtoms::onmouseover)) {
aEvent->PreventDefault();
}
}
}
return rv;
}
nsresult
nsJSUtils::EvaluateString(JSContext* aCx,
const nsAString& aScript,
JS::Handle<JSObject*> aScopeObject,
JS::CompileOptions& aCompileOptions,
EvaluateOptions& aEvaluateOptions,
JS::Value* aRetValue)
{
PROFILER_LABEL("JS", "EvaluateString");
MOZ_ASSERT_IF(aCompileOptions.versionSet,
aCompileOptions.version != JSVERSION_UNKNOWN);
MOZ_ASSERT_IF(aEvaluateOptions.coerceToString, aRetValue);
MOZ_ASSERT_IF(!aEvaluateOptions.reportUncaught, aRetValue);
MOZ_ASSERT(aCx == nsContentUtils::GetCurrentJSContext());
// Unfortunately, the JS engine actually compiles scripts with a return value
// in a different, less efficient way. Furthermore, it can't JIT them in many
// cases. So we need to be explicitly told whether the caller cares about the
// return value. Callers use null to indicate they don't care.
if (aRetValue) {
*aRetValue = JSVAL_VOID;
}
xpc_UnmarkGrayObject(aScopeObject);
nsAutoMicroTask mt;
JSPrincipals* p = JS_GetCompartmentPrincipals(js::GetObjectCompartment(aScopeObject));
aCompileOptions.setPrincipals(p);
bool ok = false;
nsresult rv = nsContentUtils::GetSecurityManager()->
CanExecuteScripts(aCx, nsJSPrincipals::get(p), &ok);
NS_ENSURE_SUCCESS(rv, rv);
NS_ENSURE_TRUE(ok, NS_OK);
// Scope the JSAutoCompartment so that we can later wrap the return value
// into the caller's cx.
{
JSAutoCompartment ac(aCx, aScopeObject);
JS::RootedObject rootedScope(aCx, aScopeObject);
ok = JS::Evaluate(aCx, rootedScope, aCompileOptions,
PromiseFlatString(aScript).get(),
aScript.Length(), aRetValue);
if (ok && aEvaluateOptions.coerceToString && !aRetValue->isUndefined()) {
JSString* str = JS_ValueToString(aCx, *aRetValue);
ok = !!str;
*aRetValue = ok ? JS::StringValue(str) : JS::UndefinedValue();
}
}
if (!ok) {
if (aEvaluateOptions.reportUncaught) {
ReportPendingException(aCx);
if (aRetValue) {
*aRetValue = JS::UndefinedValue();
}
} else {
rv = JS_IsExceptionPending(aCx) ? NS_ERROR_FAILURE
: NS_ERROR_OUT_OF_MEMORY;
JS_GetPendingException(aCx, aRetValue);
JS_ClearPendingException(aCx);
}
}
// Wrap the return value into whatever compartment aCx was in.
if (aRetValue && !JS_WrapValue(aCx, aRetValue))
return NS_ERROR_OUT_OF_MEMORY;
return rv;
}