bool
AccessCheck::isCrossOriginAccessPermitted(JSContext* cx, HandleObject wrapper, HandleId id,
                                          Wrapper::Action act)
{
    if (act == Wrapper::CALL)
        return false;

    if (act == Wrapper::ENUMERATE)
        return true;

    // For the case of getting a property descriptor, we allow if either GET or SET
    // is allowed, and rely on FilteringWrapper to filter out any disallowed accessors.
    if (act == Wrapper::GET_PROPERTY_DESCRIPTOR) {
        return isCrossOriginAccessPermitted(cx, wrapper, id, Wrapper::GET) ||
               isCrossOriginAccessPermitted(cx, wrapper, id, Wrapper::SET);
    }

    RootedObject obj(cx, js::UncheckedUnwrap(wrapper, /* stopAtOuter = */ false));
    CrossOriginObjectType type = IdentifyCrossOriginObject(obj);
    if (JSID_IS_STRING(id)) {
        if (IsPermitted(type, JSID_TO_FLAT_STRING(id), act == Wrapper::SET))
            return true;
    }

    if (act != Wrapper::GET)
        return false;

    // Check for frame IDs. If we're resolving named frames, make sure to only
    // resolve ones that don't shadow native properties. See bug 860494.
    if (type == CrossOriginWindow) {
        if (JSID_IS_STRING(id)) {
            bool wouldShadow = false;
            if (!XrayUtils::HasNativeProperty(cx, wrapper, id, &wouldShadow) ||
                wouldShadow)
            {
                // If the named subframe matches the name of a DOM constructor,
                // the global resolve triggered by the HasNativeProperty call
                // above will try to perform a CheckedUnwrap on |wrapper|, and
                // throw a security error if it fails. That exception isn't
                // really useful for our callers, so we silence it and just
                // deny access to the property (since it matched a builtin).
                //
                // Note that this would be a problem if the resolve code ever
                // tried to CheckedUnwrap the wrapper _before_ concluding that
                // the name corresponds to a builtin global property, since it
                // would mean that we'd never permit cross-origin named subframe
                // access (something we regrettably need to support).
                JS_ClearPendingException(cx);
                return false;
            }
        }
        return IsFrameId(cx, obj, id);
    }
    return false;
}

static void
ScanTypeObject(GCMarker *gcmarker, types::TypeObject *type)
{
    /* Don't mark properties for singletons. They'll be purged by the GC. */
    if (!type->singleton) {
        unsigned count = type->getPropertyCount();
        for (unsigned i = 0; i < count; i++) {
            types::Property *prop = type->getProperty(i);
            if (prop && JSID_IS_STRING(prop->id))
                PushMarkStack(gcmarker, JSID_TO_STRING(prop->id));
        }
    }

    if (TaggedProto(type->proto).isObject())
        PushMarkStack(gcmarker, type->proto);

    if (type->singleton && !type->lazy())
        PushMarkStack(gcmarker, type->singleton);

    if (type->newScript) {
        PushMarkStack(gcmarker, type->newScript->fun);
        PushMarkStack(gcmarker, type->newScript->shape);
    }

    if (type->interpretedFunction)
        PushMarkStack(gcmarker, type->interpretedFunction);
}

static bool
IsFrameId(JSContext* cx, JSObject* obj, jsid idArg)
{
    MOZ_ASSERT(!js::IsWrapper(obj));
    RootedId id(cx, idArg);

    nsGlobalWindow* win = WindowOrNull(obj);
    if (!win) {
        return false;
    }

    nsCOMPtr<nsIDOMWindowCollection> col = win->GetFrames();
    if (!col) {
        return false;
    }

    nsCOMPtr<nsIDOMWindow> domwin;
    if (JSID_IS_INT(id)) {
        col->Item(JSID_TO_INT(id), getter_AddRefs(domwin));
    } else if (JSID_IS_STRING(id)) {
        nsAutoJSString idAsString;
        if (!idAsString.init(cx, JSID_TO_STRING(id))) {
            return false;
        }
        col->NamedItem(idAsString, getter_AddRefs(domwin));
    }

    return domwin != nullptr;
}

std::string
gjs_debug_id(jsid id)
{
    if (JSID_IS_STRING(id))
        return gjs_debug_flat_string(JSID_TO_FLAT_STRING(id));
    return gjs_debug_value(js::IdToValue(id));
}

static void
ScanTypeObject(GCMarker *gcmarker, types::TypeObject *type)
{
    if (!type->singleton) {
        unsigned count = type->getPropertyCount();
        for (unsigned i = 0; i < count; i++) {
            types::Property *prop = type->getProperty(i);
            if (prop && JSID_IS_STRING(prop->id))
                PushMarkStack(gcmarker, JSID_TO_STRING(prop->id));
        }
    }

    if (type->proto)
        PushMarkStack(gcmarker, type->proto);

    if (type->newScript) {
        PushMarkStack(gcmarker, type->newScript->fun);
        PushMarkStack(gcmarker, type->newScript->shape);
    }

    if (type->interpretedFunction)
        PushMarkStack(gcmarker, type->interpretedFunction);

    if (type->singleton && !type->lazy())
        PushMarkStack(gcmarker, type->singleton);

    if (type->interpretedFunction)
        PushMarkStack(gcmarker, type->interpretedFunction);
}

/* bool newResolve (in nsIXPConnectWrappedNative wrapper, in JSContextPtr cx, in JSObjectPtr obj, in jsid id, in PRUint32 flags, out JSObjectPtr objp); */
NS_IMETHODIMP
calDateTime::NewResolve(nsIXPConnectWrappedNative *wrapper, JSContext * cx,
                        JSObject * obj, jsid id, PRUint32 flags,
                        JSObject * *objp, bool *_retval)
{
    NS_ENSURE_ARG_POINTER(objp);
    NS_ENSURE_ARG_POINTER(_retval);

    if (JSID_IS_STRING(id)) {
        size_t length;
        JSString *idString = JSID_TO_STRING(id);
        const jschar *str = JS_GetStringCharsAndLength(cx, idString, &length);

        nsDependentString const name(reinterpret_cast<PRUnichar const*>(str), length);

        if (name.EqualsLiteral("jsDate")) {
            *_retval = JS_DefineUCProperty(cx, obj, str,
                                           length,
                                           JSVAL_VOID,
                                           nsnull, nsnull, 0);
            *objp = obj;
            return *_retval ? NS_OK : NS_ERROR_FAILURE;
        }
    }

    *_retval = PR_TRUE;
    return NS_OK;
}

StringData ObjectWrapper::Key::toStringData(JSContext* cx, JSStringWrapper* jsstr) {
    if (_type == Type::Field) {
        return _field;
    }

    if (_type == Type::Index) {
        *jsstr = JSStringWrapper(_idx);
        return jsstr->toStringData();
    }

    JS::RootedId rid(cx);

    if (_type == Type::Id) {
        rid.set(_id);
    } else {
        InternedStringId id(cx, _internedString);
        rid.set(id);
    }

    if (JSID_IS_INT(rid)) {
        *jsstr = JSStringWrapper(JSID_TO_INT(rid));
        return jsstr->toStringData();
    }

    if (JSID_IS_STRING(rid)) {
        *jsstr = JSStringWrapper(cx, JSID_TO_STRING(rid));
        return jsstr->toStringData();
    }

    uasserted(ErrorCodes::BadValue, "Couldn't convert key to String");
}

bool
doResolve(JS::HandleObject obj, JS::HandleId id, bool* resolvedp)
{
    CHECK_EQUAL(resolveExitCount, 0);
    AutoIncrCounters incr(this);
    CHECK(obj == obj1 || obj == obj2);

    CHECK(JSID_IS_STRING(id));

    JSFlatString* str = JS_FlattenString(cx, JSID_TO_STRING(id));
    CHECK(str);
    JS::RootedValue v(cx);
    if (JS_FlatStringEqualsAscii(str, "x")) {
        if (obj == obj1) {
            /* First resolve hook invocation. */
            CHECK_EQUAL(resolveEntryCount, 1);
            EVAL("obj2.y = true", &v);
            CHECK(v.isTrue());
            CHECK(JS_DefinePropertyById(cx, obj, id, JS::FalseHandleValue, JSPROP_RESOLVING));
            *resolvedp = true;
            return true;
        }
        if (obj == obj2) {
            CHECK_EQUAL(resolveEntryCount, 4);
            *resolvedp = false;
            return true;
        }
    } else if (JS_FlatStringEqualsAscii(str, "y")) {
        if (obj == obj2) {
            CHECK_EQUAL(resolveEntryCount, 2);
            CHECK(JS_DefinePropertyById(cx, obj, id, JS::NullHandleValue, JSPROP_RESOLVING));
            EVAL("obj1.x", &v);
            CHECK(v.isUndefined());
            EVAL("obj1.y", &v);
            CHECK(v.isInt32(0));
            *resolvedp = true;
            return true;
        }
        if (obj == obj1) {
            CHECK_EQUAL(resolveEntryCount, 3);
            EVAL("obj1.x", &v);
            CHECK(v.isUndefined());
            EVAL("obj1.y", &v);
            CHECK(v.isUndefined());
            EVAL("obj2.y", &v);
            CHECK(v.isNull());
            EVAL("obj2.x", &v);
            CHECK(v.isUndefined());
            EVAL("obj1.y = 0", &v);
            CHECK(v.isInt32(0));
            *resolvedp = true;
            return true;
        }
    }
    CHECK(false);
    return false;
}

bool
doResolve(JSObject *obj, jsid id, uintN flags, JSObject **objp)
{
    CHECK_EQUAL(resolveExitCount, 0);
    AutoIncrCounters incr(this);
    CHECK_EQUAL(obj, obj1 || obj == obj2);
    
    CHECK(JSID_IS_STRING(id));
    
    JSFlatString *str = JS_FlattenString(cx, JSID_TO_STRING(id));
    CHECK(str);
    jsval v;
    if (JS_FlatStringEqualsAscii(str, "x")) {
        if (obj == obj1) {
            /* First resolve hook invocation. */
            CHECK_EQUAL(resolveEntryCount, 1);
            EVAL("obj2.y = true", &v);
            CHECK_SAME(v, JSVAL_TRUE);
            CHECK(JS_DefinePropertyById(cx, obj, id, JSVAL_FALSE, NULL, NULL, 0));
            *objp = obj;
            return true;
        }
        if (obj == obj2) {
            CHECK_EQUAL(resolveEntryCount, 4);
            *objp = NULL;
            return true;
        }
    } else if (JS_FlatStringEqualsAscii(str, "y")) {
        if (obj == obj2) {
            CHECK_EQUAL(resolveEntryCount, 2);
            CHECK(JS_DefinePropertyById(cx, obj, id, JSVAL_NULL, NULL, NULL, 0));
            EVAL("obj1.x", &v);
            CHECK(JSVAL_IS_VOID(v));
            EVAL("obj1.y", &v);
            CHECK_SAME(v, JSVAL_ZERO);
            *objp = obj;
            return true;
        }
        if (obj == obj1) {
            CHECK_EQUAL(resolveEntryCount, 3);
            EVAL("obj1.x", &v);
            CHECK(JSVAL_IS_VOID(v));
            EVAL("obj1.y", &v);
            CHECK(JSVAL_IS_VOID(v));
            EVAL("obj2.y", &v);
            CHECK(JSVAL_IS_NULL(v));
            EVAL("obj2.x", &v);
            CHECK(JSVAL_IS_VOID(v));
            EVAL("obj1.y = 0", &v);
            CHECK_SAME(v, JSVAL_ZERO);
            *objp = obj;
            return true;
        }
    }
    CHECK(false);
    return false;
}

NS_IMETHODIMP
StatementParams::Resolve(nsIXPConnectWrappedNative *aWrapper,
                         JSContext *aCtx,
                         JSObject *aScopeObj,
                         jsid aId,
                         bool *resolvedp,
                         bool *_retval)
{
  NS_ENSURE_TRUE(mStatement, NS_ERROR_NOT_INITIALIZED);
  // We do not throw at any point after this unless our index is out of range
  // because we want to allow the prototype chain to be checked for the
  // property.

  JS::RootedObject scope(aCtx, aScopeObj);
  JS::RootedId id(aCtx, aId);
  bool resolved = false;
  bool ok = true;
  if (JSID_IS_INT(id)) {
    uint32_t idx = JSID_TO_INT(id);

    // Ensure that our index is within range.  We do not care about the
    // prototype chain being checked here.
    if (idx >= mParamCount)
      return NS_ERROR_INVALID_ARG;

    ok = ::JS_DefineElement(aCtx, scope, idx, JS::UndefinedHandleValue,
                            JSPROP_ENUMERATE | JSPROP_RESOLVING);
    resolved = true;
  }
  else if (JSID_IS_STRING(id)) {
    JSString *str = JSID_TO_STRING(id);
    nsAutoJSString autoStr;
    if (!autoStr.init(aCtx, str)) {
      return NS_ERROR_FAILURE;
    }

    // Check to see if there's a parameter with this name, and if not, let
    // the rest of the prototype chain be checked.
    NS_ConvertUTF16toUTF8 name(autoStr);
    uint32_t idx;
    nsresult rv = mStatement->GetParameterIndex(name, &idx);
    if (NS_SUCCEEDED(rv)) {
      ok = ::JS_DefinePropertyById(aCtx, scope, id, JS::UndefinedHandleValue,
                                   JSPROP_ENUMERATE | JSPROP_RESOLVING);
      resolved = true;
    }
  }

  *_retval = ok;
  *resolvedp = resolved && ok;
  return NS_OK;
}

NS_IMETHODIMP
StatementParams::NewResolve(nsIXPConnectWrappedNative *aWrapper,
                            JSContext *aCtx,
                            JSObject *aScopeObj,
                            jsid aId,
                            uint32_t aFlags,
                            JSObject **_objp,
                            bool *_retval)
{
  NS_ENSURE_TRUE(mStatement, NS_ERROR_NOT_INITIALIZED);
  // We do not throw at any point after this unless our index is out of range
  // because we want to allow the prototype chain to be checked for the
  // property.

  JS::RootedObject scope(aCtx, aScopeObj);
  JS::RootedId id(aCtx, aId);
  bool resolved = false;
  bool ok = true;
  if (JSID_IS_INT(id)) {
    uint32_t idx = JSID_TO_INT(id);

    // Ensure that our index is within range.  We do not care about the
    // prototype chain being checked here.
    if (idx >= mParamCount)
      return NS_ERROR_INVALID_ARG;

    ok = ::JS_DefineElement(aCtx, scope, idx, JSVAL_VOID, nullptr,
                            nullptr, JSPROP_ENUMERATE);
    resolved = true;
  }
  else if (JSID_IS_STRING(id)) {
    JSString *str = JSID_TO_STRING(id);
    size_t nameLength;
    const jschar *nameChars = JS_GetStringCharsAndLength(aCtx, str, &nameLength);
    NS_ENSURE_TRUE(nameChars, NS_ERROR_UNEXPECTED);

    // Check to see if there's a parameter with this name, and if not, let
    // the rest of the prototype chain be checked.
    NS_ConvertUTF16toUTF8 name(nameChars, nameLength);
    uint32_t idx;
    nsresult rv = mStatement->GetParameterIndex(name, &idx);
    if (NS_SUCCEEDED(rv)) {
      ok = ::JS_DefinePropertyById(aCtx, scope, id, JSVAL_VOID, nullptr,
                                   nullptr, JSPROP_ENUMERATE);
      resolved = true;
    }
  }

  *_retval = ok;
  *_objp = resolved && ok ? scope.get() : nullptr;
  return NS_OK;
}

static inline void
MarkIdInternal(JSTracer *trc, jsid *id)
{
    if (JSID_IS_STRING(*id)) {
        JSString *str = JSID_TO_STRING(*id);
        MarkInternal(trc, &str);
        *id = ATOM_TO_JSID(reinterpret_cast<JSAtom *>(str));
    } else if (JS_UNLIKELY(JSID_IS_OBJECT(*id))) {
        JSObject *obj = JSID_TO_OBJECT(*id);
        MarkInternal(trc, &obj);
        *id = OBJECT_TO_JSID(obj);
    }
}

StringData IdWrapper::toStringData(JSStringWrapper* jsstr) const {
    if (JSID_IS_STRING(_value)) {
        *jsstr = JSStringWrapper(_context, JSID_TO_STRING(_value));
    } else if (JSID_IS_INT(_value)) {
        *jsstr = JSStringWrapper(JSID_TO_INT(_value));
    } else {
        throwCurrentJSException(_context,
                                ErrorCodes::TypeMismatch,
                                "Cannot toString() non-string and non-integer jsid");
    }

    return jsstr->toStringData();
}

JSBool JavaObject::getProperty(JSContext* ctx, JSObject* obj, jsid id,
    jsval* rval) {
  Debug::log(Debug::Spam) << "JavaObject::getProperty obj=" << obj << Debug::flush;
  SessionData* data = JavaObject::getSessionData(ctx, obj);
  if (!data) {
    // TODO: replace the frame with an error page instead?
    *rval = JSVAL_VOID;
    return JS_TRUE;
  }
  int objectRef = JavaObject::getObjectId(ctx, obj);
  if (JSID_IS_STRING(id)) {
    JSString* str = JSID_TO_STRING(id);
    if ((JS_GetStringEncodingLength(ctx, str) == 8) && !strncmp("toString",
          JS_EncodeString(ctx, str), 8)) {
      *rval = data->getToStringTearOff();
      return JS_TRUE;
    }
    if ((JS_GetStringEncodingLength(ctx, str) == 2) && !strncmp("id",
          JS_EncodeString(ctx, str), 2)) {
      *rval = INT_TO_JSVAL(objectRef);
      return JS_TRUE;
    }
    if ((JS_GetStringEncodingLength(ctx, str) == 16) && !strncmp("__noSuchMethod__",
          JS_EncodeString(ctx, str), 16)) {
      // Avoid error spew if we are disconnected
      *rval = JSVAL_VOID;
      return JS_TRUE;
    }
    // TODO: dumpJsVal can no longer handle this case
    //Debug::log(Debug::Error) << "Getting unexpected string property "
    //    << dumpJsVal(ctx, id) << Debug::flush;
    // TODO: throw a better exception here
    return JS_FALSE;
  }
  if (!JSID_IS_INT(id)) {
    // TODO: dumpJsVal can no longer handle this case
    //Debug::log(Debug::Error) << "Getting non-int/non-string property "
    //      << dumpJsVal(ctx, id) << Debug::flush;
    // TODO: throw a better exception here
    return JS_FALSE;
  }
  int dispId = JSID_TO_INT(id);

  HostChannel* channel = data->getHostChannel();
  SessionHandler* handler = data->getSessionHandler();

  gwt::Value value = ServerMethods::getProperty(*channel, handler, objectRef, dispId);
  data->makeJsvalFromValue(*rval, ctx, value);
  return JS_TRUE;
}

NS_IMETHODIMP
StatementParams::NewResolve(nsIXPConnectWrappedNative *aWrapper,
                            JSContext *aCtx,
                            JSObject *aScopeObj,
                            jsid aId,
                            PRUint32 aFlags,
                            JSObject **_objp,
                            PRBool *_retval)
{
  NS_ENSURE_TRUE(mStatement, NS_ERROR_NOT_INITIALIZED);
  // We do not throw at any point after this unless our index is out of range
  // because we want to allow the prototype chain to be checked for the
  // property.

  bool resolved = false;
  PRBool ok = PR_TRUE;
  if (JSID_IS_INT(aId)) {
    PRUint32 idx = JSID_TO_INT(aId);

    // Ensure that our index is within range.  We do not care about the
    // prototype chain being checked here.
    if (idx >= mParamCount)
      return NS_ERROR_INVALID_ARG;

    ok = ::JS_DefineElement(aCtx, aScopeObj, idx, JSVAL_VOID, nsnull,
                            nsnull, JSPROP_ENUMERATE);
    resolved = true;
  }
  else if (JSID_IS_STRING(aId)) {
    JSString *str = JSID_TO_STRING(aId);
    jschar *nameChars = ::JS_GetStringChars(str);
    size_t nameLength = ::JS_GetStringLength(str);

    // Check to see if there's a parameter with this name, and if not, let
    // the rest of the prototype chain be checked.
    NS_ConvertUTF16toUTF8 name(reinterpret_cast<const PRUnichar *>(nameChars),
                               nameLength);
    PRUint32 idx;
    nsresult rv = mStatement->GetParameterIndex(name, &idx);
    if (NS_SUCCEEDED(rv)) {
      ok = ::JS_DefineUCProperty(aCtx, aScopeObj, nameChars, nameLength,
                                 JSVAL_VOID, nsnull, nsnull, JSPROP_ENUMERATE);
      resolved = true;
    }
  }

  *_retval = ok;
  *_objp = resolved && ok ? aScopeObj : nsnull;
  return NS_OK;
}

static void
ScanShape(GCMarker *gcmarker, Shape *shape)
{
  restart:
    PushMarkStack(gcmarker, shape->base());

    const HeapId &id = shape->propidRef();
    if (JSID_IS_STRING(id))
        PushMarkStack(gcmarker, JSID_TO_STRING(id));
    else if (JS_UNLIKELY(JSID_IS_OBJECT(id)))
        PushMarkStack(gcmarker, JSID_TO_OBJECT(id));

    shape = shape->previous();
    if (shape && shape->markIfUnmarked(gcmarker->getMarkColor()))
        goto restart;
}

NS_INTERFACE_MAP_END

////////////////////////////////////////////////////////////////////////////////
//// nsIXPCScriptable

#define XPC_MAP_CLASSNAME StatementJSHelper
#define XPC_MAP_QUOTED_CLASSNAME "StatementJSHelper"
#define XPC_MAP_WANT_GETPROPERTY
#define XPC_MAP_WANT_RESOLVE
#define XPC_MAP_FLAGS nsIXPCScriptable::ALLOW_PROP_MODS_DURING_RESOLVE
#include "xpc_map_end.h"

NS_IMETHODIMP
StatementJSHelper::GetProperty(nsIXPConnectWrappedNative *aWrapper,
                               JSContext *aCtx,
                               JSObject *aScopeObj,
                               jsid aId,
                               JS::Value *_result,
                               bool *_retval)
{
  if (!JSID_IS_STRING(aId))
    return NS_OK;

  JS::Rooted<JSObject*> scope(aCtx, aScopeObj);
  JS::Rooted<jsid> id(aCtx, aId);

#ifdef DEBUG
  {
    nsCOMPtr<mozIStorageStatement> isStatement(
                                     do_QueryInterface(aWrapper->Native()));
    NS_ASSERTION(isStatement, "How is this not a statement?!");
  }
#endif

  Statement *stmt = static_cast<Statement *>(
    static_cast<mozIStorageStatement *>(aWrapper->Native())
  );

  JSFlatString *str = JSID_TO_FLAT_STRING(id);
  if (::JS_FlatStringEqualsAscii(str, "row"))
    return getRow(stmt, aCtx, scope, _result);

  if (::JS_FlatStringEqualsAscii(str, "params"))
    return getParams(stmt, aCtx, scope, _result);

  return NS_OK;
}

// static
void
XPCThrower::Verbosify(XPCCallContext& ccx,
                      char** psz, PRBool own)
{
    char* sz = nsnull;

    if(ccx.HasInterfaceAndMember())
    {
        XPCNativeInterface* iface = ccx.GetInterface();
        jsid id = JSID_VOID;
#ifdef XPC_IDISPATCH_SUPPORT
        NS_ASSERTION(ccx.GetIDispatchMember() == nsnull || 
                        ccx.GetMember() == nsnull,
                     "Both IDispatch member and regular XPCOM member "
                     "were set in XPCCallContext");
        if(ccx.GetIDispatchMember())
        {
            XPCDispInterface::Member * member = 
                reinterpret_cast<XPCDispInterface::Member*>(ccx.GetIDispatchMember());
            if(member && JSID_IS_STRING(member->GetName()))
            {
                id = member->GetName();
            }
        }
        else
#endif
        {
            id = ccx.GetMember()->GetName();
        }
        JSAutoByteString bytes;
        const char *name = JSID_IS_VOID(id) ? "Unknown" : bytes.encode(ccx, JSID_TO_STRING(id));
        if(!name)
        {
            name = "";
        }
        sz = JS_smprintf("%s [%s.%s]", *psz, iface->GetNameString(), name);
    }

    if(sz)
    {
        if(own)
            JS_smprintf_free(*psz);
        *psz = sz;
    }
}

static inline void
MarkIdInternal(JSTracer *trc, jsid *id)
{
    if (JSID_IS_STRING(*id)) {
        JSString *str = JSID_TO_STRING(*id);
        JS_SET_TRACING_LOCATION(trc, (void *)id);
        MarkInternal(trc, &str);
        *id = NON_INTEGER_ATOM_TO_JSID(reinterpret_cast<JSAtom *>(str));
    } else if (JS_UNLIKELY(JSID_IS_OBJECT(*id))) {
        JSObject *obj = JSID_TO_OBJECT(*id);
        JS_SET_TRACING_LOCATION(trc, (void *)id);
        MarkInternal(trc, &obj);
        *id = OBJECT_TO_JSID(obj);
    } else {
        /* Unset realLocation manually if we do not call MarkInternal. */
        JS_UNSET_TRACING_LOCATION(trc);
    }
}

NS_IMETHODIMP
StatementJSHelper::Resolve(nsIXPConnectWrappedNative *aWrapper,
                           JSContext *aCtx, JSObject *aScopeObj,
                           jsid aId, bool *aResolvedp,
                           bool *_retval)
{
  if (!JSID_IS_STRING(aId))
    return NS_OK;

  JS::RootedObject scope(aCtx, aScopeObj);
  if (::JS_FlatStringEqualsAscii(JSID_TO_FLAT_STRING(aId), "step")) {
    *_retval = ::JS_DefineFunction(aCtx, scope, "step", stepFunc,
                                   0, JSPROP_RESOLVING) != nullptr;
    *aResolvedp = true;
    return NS_OK;
  }
  return NS_OK;
}