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diff --git a/js/xpconnect/src/XPCWrappedNativeJSOps.cpp b/js/xpconnect/src/XPCWrappedNativeJSOps.cpp
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+++ b/js/xpconnect/src/XPCWrappedNativeJSOps.cpp
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 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/. */
+
+/* JavaScript JSClasses and JSOps for our Wrapped Native JS Objects. */
+
+#include "xpcprivate.h"
+#include "xpc_make_class.h"
+#include "mozilla/dom/BindingUtils.h"
+#include "mozilla/Maybe.h"
+#include "mozilla/Preferences.h"
+#include "js/CharacterEncoding.h"
+#include "js/Class.h"
+#include "js/Object.h" // JS::GetClass
+#include "js/Printf.h"
+#include "js/PropertyAndElement.h" // JS_DefineProperty, JS_DefinePropertyById, JS_GetProperty, JS_GetPropertyById
+#include "js/Symbol.h"
+
+#include <string_view>
+
+using namespace mozilla;
+using namespace JS;
+using namespace xpc;
+
+/***************************************************************************/
+
+// All of the exceptions thrown into JS from this file go through here.
+// That makes this a nice place to set a breakpoint.
+
+static bool Throw(nsresult errNum, JSContext* cx) {
+ XPCThrower::Throw(errNum, cx);
+ return false;
+}
+
+// Handy macro used in many callback stub below.
+
+#define THROW_AND_RETURN_IF_BAD_WRAPPER(cx, wrapper) \
+ PR_BEGIN_MACRO \
+ if (!wrapper) return Throw(NS_ERROR_XPC_BAD_OP_ON_WN_PROTO, cx); \
+ if (!wrapper->IsValid()) return Throw(NS_ERROR_XPC_HAS_BEEN_SHUTDOWN, cx); \
+ PR_END_MACRO
+
+/***************************************************************************/
+
+static bool ToStringGuts(XPCCallContext& ccx) {
+ UniqueChars sz;
+ XPCWrappedNative* wrapper = ccx.GetWrapper();
+
+ if (wrapper) {
+ sz.reset(wrapper->ToString(ccx.GetTearOff()));
+ } else {
+ sz = JS_smprintf("[xpconnect wrapped native prototype]");
+ }
+
+ if (!sz) {
+ JS_ReportOutOfMemory(ccx);
+ return false;
+ }
+
+ JSString* str = JS_NewStringCopyZ(ccx, sz.get());
+ if (!str) {
+ return false;
+ }
+
+ ccx.SetRetVal(JS::StringValue(str));
+ return true;
+}
+
+/***************************************************************************/
+
+static bool XPC_WN_Shared_ToString(JSContext* cx, unsigned argc, Value* vp) {
+ CallArgs args = CallArgsFromVp(argc, vp);
+
+ RootedObject obj(cx);
+ if (!args.computeThis(cx, &obj)) {
+ return false;
+ }
+
+ XPCCallContext ccx(cx, obj);
+ if (!ccx.IsValid()) {
+ return Throw(NS_ERROR_XPC_BAD_OP_ON_WN_PROTO, cx);
+ }
+ ccx.SetName(ccx.GetContext()->GetStringID(XPCJSContext::IDX_TO_STRING));
+ ccx.SetArgsAndResultPtr(args.length(), args.array(), vp);
+ return ToStringGuts(ccx);
+}
+
+static bool XPC_WN_Shared_ToSource(JSContext* cx, unsigned argc, Value* vp) {
+ CallArgs args = CallArgsFromVp(argc, vp);
+ static constexpr std::string_view empty = "({})";
+ JSString* str = JS_NewStringCopyN(cx, empty.data(), empty.length());
+ if (!str) {
+ return false;
+ }
+ args.rval().setString(str);
+
+ return true;
+}
+
+static bool XPC_WN_Shared_toPrimitive(JSContext* cx, unsigned argc, Value* vp) {
+ CallArgs args = CallArgsFromVp(argc, vp);
+
+ RootedObject obj(cx);
+ if (!JS_ValueToObject(cx, args.thisv(), &obj)) {
+ return false;
+ }
+ XPCCallContext ccx(cx, obj);
+ XPCWrappedNative* wrapper = ccx.GetWrapper();
+ THROW_AND_RETURN_IF_BAD_WRAPPER(cx, wrapper);
+
+ JSType hint;
+ if (!GetFirstArgumentAsTypeHint(cx, args, &hint)) {
+ return false;
+ }
+
+ if (hint == JSTYPE_NUMBER) {
+ args.rval().set(NaNValue());
+ return true;
+ }
+
+ MOZ_ASSERT(hint == JSTYPE_STRING || hint == JSTYPE_UNDEFINED);
+ ccx.SetName(ccx.GetContext()->GetStringID(XPCJSContext::IDX_TO_STRING));
+ ccx.SetArgsAndResultPtr(0, nullptr, args.rval().address());
+
+ XPCNativeMember* member = ccx.GetMember();
+ if (member && member->IsMethod()) {
+ if (!XPCWrappedNative::CallMethod(ccx)) {
+ return false;
+ }
+
+ if (args.rval().isPrimitive()) {
+ return true;
+ }
+ }
+
+ // else...
+ return ToStringGuts(ccx);
+}
+
+/***************************************************************************/
+
+// A "double wrapped object" is a user JSObject that has been wrapped as a
+// wrappedJS in order to be used by native code and then re-wrapped by a
+// wrappedNative wrapper to be used by JS code. One might think of it as:
+// wrappedNative(wrappedJS(underlying_JSObject))
+// This is done (as opposed to just unwrapping the wrapped JS and automatically
+// returning the underlying JSObject) so that JS callers will see what looks
+// Like any other xpcom object - and be limited to use its interfaces.
+//
+
+/**
+ * When JavaScript code uses a component that is itself implemented in
+ * JavaScript then XPConnect will build a wrapper rather than directly
+ * expose the JSObject of the component. This allows components implemented
+ * in JavaScript to 'look' just like any other xpcom component (from the
+ * perspective of the JavaScript caller). This insulates the component from
+ * the caller and hides any properties or methods that are not part of the
+ * interface as declared in xpidl. Usually this is a good thing.
+ *
+ * However, in some cases it is useful to allow the JS caller access to the
+ * JS component's underlying implementation. In order to facilitate this
+ * XPConnect supports the 'wrappedJSObject' property. This 'wrappedJSObject'
+ * property is different than the XrayWrapper meaning. (The naming collision
+ * avoids having more than one magic XPConnect property name, but is
+ * confusing.)
+ *
+ * The caller code can do:
+ *
+ * // 'foo' is some xpcom component (that might be implemented in JS).
+ * var bar = foo.wrappedJSObject;
+ * if(bar) {
+ * // bar is the underlying JSObject. Do stuff with it here.
+ * }
+ *
+ * Recall that 'foo' above is an XPConnect wrapper, not the underlying JS
+ * object. The property get "foo.wrappedJSObject" will only succeed if three
+ * conditions are met:
+ *
+ * 1) 'foo' really is an XPConnect wrapper around a JSObject.
+ * 3) The caller must be system JS and not content. Double-wrapped XPCWJS should
+ * not be exposed to content except with a remote-XUL domain.
+ *
+ * Notes:
+ *
+ * a) If 'foo' above were the underlying JSObject and not a wrapper at all,
+ * then this all just works and XPConnect is not part of the picture at all.
+ * b) One might ask why 'foo' should not just implement an interface through
+ * which callers might get at the underlying object. There are two reasons:
+ * i) XPConnect would still have to do magic since JSObject is not a
+ * scriptable type.
+ * ii) Avoiding the explicit interface makes it easier for both the caller
+ * and the component.
+ */
+
+static JSObject* GetDoubleWrappedJSObject(XPCCallContext& ccx,
+ XPCWrappedNative* wrapper) {
+ RootedObject obj(ccx);
+ {
+ nsCOMPtr<nsIXPConnectWrappedJS> underware =
+ do_QueryInterface(wrapper->GetIdentityObject());
+ if (!underware) {
+ return nullptr;
+ }
+ RootedObject mainObj(ccx, underware->GetJSObject());
+ if (mainObj) {
+ JSAutoRealm ar(ccx, underware->GetJSObjectGlobal());
+
+ // We don't have to root this ID, as it's already rooted by our context.
+ HandleId id =
+ ccx.GetContext()->GetStringID(XPCJSContext::IDX_WRAPPED_JSOBJECT);
+
+ // If the `wrappedJSObject` property is defined, use the result of getting
+ // that property, otherwise fall back to the `mainObj` object which is
+ // directly being wrapped.
+ RootedValue val(ccx);
+ if (JS_GetPropertyById(ccx, mainObj, id, &val) && !val.isPrimitive()) {
+ obj = val.toObjectOrNull();
+ } else {
+ obj = mainObj;
+ }
+ }
+ }
+ return obj;
+}
+
+// This is the getter native function we use to handle 'wrappedJSObject' for
+// double wrapped JSObjects.
+
+static bool XPC_WN_DoubleWrappedGetter(JSContext* cx, unsigned argc,
+ Value* vp) {
+ CallArgs args = CallArgsFromVp(argc, vp);
+
+ if (!args.thisv().isObject()) {
+ JS_ReportErrorASCII(
+ cx,
+ "xpconnect double wrapped getter called on incompatible non-object");
+ return false;
+ }
+ RootedObject obj(cx, &args.thisv().toObject());
+
+ XPCCallContext ccx(cx, obj);
+ XPCWrappedNative* wrapper = ccx.GetWrapper();
+ THROW_AND_RETURN_IF_BAD_WRAPPER(cx, wrapper);
+
+ MOZ_ASSERT(JS_TypeOfValue(cx, args.calleev()) == JSTYPE_FUNCTION,
+ "bad function");
+
+ RootedObject realObject(cx, GetDoubleWrappedJSObject(ccx, wrapper));
+ if (!realObject) {
+ // This is pretty unexpected at this point. The object originally
+ // responded to this get property call and now gives no object.
+ // XXX Should this throw something at the caller?
+ args.rval().setNull();
+ return true;
+ }
+
+ // It is a double wrapped object. This should really never appear in
+ // content these days, but addons still do it - see bug 965921.
+ if (MOZ_UNLIKELY(!nsContentUtils::IsSystemCaller(cx))) {
+ JS_ReportErrorASCII(cx,
+ "Attempt to use .wrappedJSObject in untrusted code");
+ return false;
+ }
+ args.rval().setObject(*realObject);
+ return JS_WrapValue(cx, args.rval());
+}
+
+/***************************************************************************/
+
+// This is our shared function to define properties on our JSObjects.
+
+/*
+ * NOTE:
+ * We *never* set the tearoff names (e.g. nsIFoo) as JS_ENUMERATE.
+ * We *never* set toString or toSource as JS_ENUMERATE.
+ */
+
+static bool DefinePropertyIfFound(
+ XPCCallContext& ccx, HandleObject obj, HandleId idArg, XPCNativeSet* set,
+ XPCNativeInterface* ifaceArg, XPCNativeMember* member,
+ XPCWrappedNativeScope* scope, bool reflectToStringAndToSource,
+ XPCWrappedNative* wrapperToReflectInterfaceNames,
+ XPCWrappedNative* wrapperToReflectDoubleWrap, nsIXPCScriptable* scr,
+ unsigned propFlags, bool* resolved) {
+ RootedId id(ccx, idArg);
+ RefPtr<XPCNativeInterface> iface = ifaceArg;
+ XPCJSContext* xpccx = ccx.GetContext();
+ bool found;
+ const char* name;
+
+ propFlags |= JSPROP_RESOLVING;
+
+ if (set) {
+ if (iface) {
+ found = true;
+ } else {
+ found = set->FindMember(id, &member, &iface);
+ }
+ } else
+ found = (nullptr != (member = iface->FindMember(id)));
+
+ if (!found) {
+ if (reflectToStringAndToSource) {
+ JSNative call;
+ if (id == xpccx->GetStringID(XPCJSContext::IDX_TO_STRING)) {
+ call = XPC_WN_Shared_ToString;
+ name = xpccx->GetStringName(XPCJSContext::IDX_TO_STRING);
+ } else if (id == xpccx->GetStringID(XPCJSContext::IDX_TO_SOURCE)) {
+ call = XPC_WN_Shared_ToSource;
+ name = xpccx->GetStringName(XPCJSContext::IDX_TO_SOURCE);
+ } else if (id.isWellKnownSymbol(JS::SymbolCode::toPrimitive)) {
+ call = XPC_WN_Shared_toPrimitive;
+ name = "[Symbol.toPrimitive]";
+ } else {
+ call = nullptr;
+ }
+
+ if (call) {
+ RootedFunction fun(ccx, JS_NewFunction(ccx, call, 0, 0, name));
+ if (!fun) {
+ JS_ReportOutOfMemory(ccx);
+ return false;
+ }
+
+ AutoResolveName arn(ccx, id);
+ if (resolved) {
+ *resolved = true;
+ }
+ RootedObject value(ccx, JS_GetFunctionObject(fun));
+ return JS_DefinePropertyById(ccx, obj, id, value,
+ propFlags & ~JSPROP_ENUMERATE);
+ }
+ }
+ // This *might* be a tearoff name that is not yet part of our
+ // set. Let's lookup the name and see if it is the name of an
+ // interface. Then we'll see if the object actually *does* this
+ // interface and add a tearoff as necessary.
+
+ if (wrapperToReflectInterfaceNames) {
+ JS::UniqueChars name;
+ RefPtr<XPCNativeInterface> iface2;
+ XPCWrappedNativeTearOff* to;
+ RootedObject jso(ccx);
+ nsresult rv = NS_OK;
+
+ bool defineProperty = false;
+ do {
+ if (!id.isString()) {
+ break;
+ }
+
+ name = JS_EncodeStringToLatin1(ccx, id.toString());
+ if (!name) {
+ break;
+ }
+
+ iface2 = XPCNativeInterface::GetNewOrUsed(ccx, name.get());
+ if (!iface2) {
+ break;
+ }
+
+ to =
+ wrapperToReflectInterfaceNames->FindTearOff(ccx, iface2, true, &rv);
+ if (!to) {
+ break;
+ }
+
+ jso = to->GetJSObject();
+ if (!jso) {
+ break;
+ }
+
+ defineProperty = true;
+ } while (false);
+
+ if (defineProperty) {
+ AutoResolveName arn(ccx, id);
+ if (resolved) {
+ *resolved = true;
+ }
+ return JS_DefinePropertyById(ccx, obj, id, jso,
+ propFlags & ~JSPROP_ENUMERATE);
+ } else if (NS_FAILED(rv) && rv != NS_ERROR_NO_INTERFACE) {
+ return Throw(rv, ccx);
+ }
+ }
+
+ // This *might* be a double wrapped JSObject
+ if (wrapperToReflectDoubleWrap &&
+ id == xpccx->GetStringID(XPCJSContext::IDX_WRAPPED_JSOBJECT) &&
+ GetDoubleWrappedJSObject(ccx, wrapperToReflectDoubleWrap)) {
+ // We build and add a getter function.
+ // A security check is done on a per-get basis.
+
+ JSFunction* fun;
+
+ id = xpccx->GetStringID(XPCJSContext::IDX_WRAPPED_JSOBJECT);
+ name = xpccx->GetStringName(XPCJSContext::IDX_WRAPPED_JSOBJECT);
+
+ fun = JS_NewFunction(ccx, XPC_WN_DoubleWrappedGetter, 0, 0, name);
+
+ if (!fun) {
+ return false;
+ }
+
+ RootedObject funobj(ccx, JS_GetFunctionObject(fun));
+ if (!funobj) {
+ return false;
+ }
+
+ propFlags &= ~JSPROP_ENUMERATE;
+
+ AutoResolveName arn(ccx, id);
+ if (resolved) {
+ *resolved = true;
+ }
+ return JS_DefinePropertyById(ccx, obj, id, funobj, nullptr, propFlags);
+ }
+
+ if (resolved) {
+ *resolved = false;
+ }
+ return true;
+ }
+
+ if (!member) {
+ if (wrapperToReflectInterfaceNames) {
+ XPCWrappedNativeTearOff* to =
+ wrapperToReflectInterfaceNames->FindTearOff(ccx, iface, true);
+
+ if (!to) {
+ return false;
+ }
+ RootedObject jso(ccx, to->GetJSObject());
+ if (!jso) {
+ return false;
+ }
+
+ AutoResolveName arn(ccx, id);
+ if (resolved) {
+ *resolved = true;
+ }
+ return JS_DefinePropertyById(ccx, obj, id, jso,
+ propFlags & ~JSPROP_ENUMERATE);
+ }
+ if (resolved) {
+ *resolved = false;
+ }
+ return true;
+ }
+
+ if (member->IsConstant()) {
+ RootedValue val(ccx);
+ AutoResolveName arn(ccx, id);
+ if (resolved) {
+ *resolved = true;
+ }
+ return member->GetConstantValue(ccx, iface, val.address()) &&
+ JS_DefinePropertyById(ccx, obj, id, val, propFlags);
+ }
+
+ if (id == xpccx->GetStringID(XPCJSContext::IDX_TO_STRING) ||
+ id == xpccx->GetStringID(XPCJSContext::IDX_TO_SOURCE) ||
+ (scr && scr->DontEnumQueryInterface() &&
+ id == xpccx->GetStringID(XPCJSContext::IDX_QUERY_INTERFACE)))
+ propFlags &= ~JSPROP_ENUMERATE;
+
+ RootedValue funval(ccx);
+ if (!member->NewFunctionObject(ccx, iface, obj, funval.address())) {
+ return false;
+ }
+
+ if (member->IsMethod()) {
+ AutoResolveName arn(ccx, id);
+ if (resolved) {
+ *resolved = true;
+ }
+ return JS_DefinePropertyById(ccx, obj, id, funval, propFlags);
+ }
+
+ // else...
+
+ MOZ_ASSERT(member->IsAttribute(), "way broken!");
+
+ propFlags &= ~JSPROP_READONLY;
+ RootedObject funobjGetter(ccx, funval.toObjectOrNull());
+ RootedObject funobjSetter(ccx);
+ if (member->IsWritableAttribute()) {
+ funobjSetter = funobjGetter;
+ }
+
+ AutoResolveName arn(ccx, id);
+ if (resolved) {
+ *resolved = true;
+ }
+
+ return JS_DefinePropertyById(ccx, obj, id, funobjGetter, funobjSetter,
+ propFlags);
+}
+
+/***************************************************************************/
+/***************************************************************************/
+
+static bool XPC_WN_OnlyIWrite_AddPropertyStub(JSContext* cx, HandleObject obj,
+ HandleId id, HandleValue v) {
+ XPCCallContext ccx(cx, obj, nullptr, id);
+ XPCWrappedNative* wrapper = ccx.GetWrapper();
+ THROW_AND_RETURN_IF_BAD_WRAPPER(cx, wrapper);
+
+ // Allow only XPConnect to add/set the property
+ if (ccx.GetResolveName() == id) {
+ return true;
+ }
+
+ return Throw(NS_ERROR_XPC_CANT_MODIFY_PROP_ON_WN, cx);
+}
+
+bool XPC_WN_CannotModifyPropertyStub(JSContext* cx, HandleObject obj,
+ HandleId id, HandleValue v) {
+ return Throw(NS_ERROR_XPC_CANT_MODIFY_PROP_ON_WN, cx);
+}
+
+bool XPC_WN_CannotDeletePropertyStub(JSContext* cx, HandleObject obj,
+ HandleId id, ObjectOpResult& result) {
+ return Throw(NS_ERROR_XPC_CANT_MODIFY_PROP_ON_WN, cx);
+}
+
+bool XPC_WN_Shared_Enumerate(JSContext* cx, HandleObject obj) {
+ XPCCallContext ccx(cx, obj);
+ XPCWrappedNative* wrapper = ccx.GetWrapper();
+ THROW_AND_RETURN_IF_BAD_WRAPPER(cx, wrapper);
+
+ // Since we aren't going to enumerate tearoff names and the prototype
+ // handles non-mutated members, we can do this potential short-circuit.
+ if (!wrapper->HasMutatedSet()) {
+ return true;
+ }
+
+ XPCNativeSet* set = wrapper->GetSet();
+ XPCNativeSet* protoSet =
+ wrapper->HasProto() ? wrapper->GetProto()->GetSet() : nullptr;
+
+ uint16_t interface_count = set->GetInterfaceCount();
+ XPCNativeInterface** interfaceArray = set->GetInterfaceArray();
+ for (uint16_t i = 0; i < interface_count; i++) {
+ XPCNativeInterface* iface = interfaceArray[i];
+ uint16_t member_count = iface->GetMemberCount();
+ for (uint16_t k = 0; k < member_count; k++) {
+ XPCNativeMember* member = iface->GetMemberAt(k);
+ jsid name = member->GetName();
+
+ // Skip if this member is going to come from the proto.
+ uint16_t index;
+ if (protoSet && protoSet->FindMember(name, nullptr, &index) && index == i)
+ continue;
+
+ JS_MarkCrossZoneId(cx, name);
+ if (!xpc_ForcePropertyResolve(cx, obj, name)) {
+ return false;
+ }
+ }
+ }
+ return true;
+}
+
+/***************************************************************************/
+
+enum WNHelperType { WN_NOHELPER, WN_HELPER };
+
+static void WrappedNativeFinalize(JS::GCContext* gcx, JSObject* obj,
+ WNHelperType helperType) {
+ const JSClass* clazz = JS::GetClass(obj);
+ if (clazz->flags & JSCLASS_DOM_GLOBAL) {
+ mozilla::dom::DestroyProtoAndIfaceCache(obj);
+ }
+ XPCWrappedNative* wrapper = JS::GetObjectISupports<XPCWrappedNative>(obj);
+ if (!wrapper) {
+ return;
+ }
+
+ if (helperType == WN_HELPER) {
+ wrapper->GetScriptable()->Finalize(wrapper, gcx, obj);
+ }
+ wrapper->FlatJSObjectFinalized();
+}
+
+static size_t WrappedNativeObjectMoved(JSObject* obj, JSObject* old) {
+ XPCWrappedNative* wrapper = JS::GetObjectISupports<XPCWrappedNative>(obj);
+ if (!wrapper) {
+ return 0;
+ }
+
+ wrapper->FlatJSObjectMoved(obj, old);
+ return 0;
+}
+
+void XPC_WN_NoHelper_Finalize(JS::GCContext* gcx, JSObject* obj) {
+ WrappedNativeFinalize(gcx, obj, WN_NOHELPER);
+}
+
+/*
+ * General comment about XPConnect tracing: Given a C++ object |wrapper| and its
+ * corresponding JS object |obj|, calling |wrapper->TraceSelf| will ask the JS
+ * engine to mark |obj|. Eventually, this will lead to the trace hook being
+ * called for |obj|. The trace hook should call |wrapper->TraceInside|, which
+ * should mark any JS objects held by |wrapper| as members.
+ */
+
+/* static */
+void XPCWrappedNative::Trace(JSTracer* trc, JSObject* obj) {
+ const JSClass* clazz = JS::GetClass(obj);
+ if (clazz->flags & JSCLASS_DOM_GLOBAL) {
+ mozilla::dom::TraceProtoAndIfaceCache(trc, obj);
+ }
+ MOZ_ASSERT(clazz->isWrappedNative());
+
+ XPCWrappedNative* wrapper = XPCWrappedNative::Get(obj);
+ if (wrapper && wrapper->IsValid()) {
+ wrapper->TraceInside(trc);
+ }
+}
+
+void XPCWrappedNative_Trace(JSTracer* trc, JSObject* obj) {
+ XPCWrappedNative::Trace(trc, obj);
+}
+
+static bool XPC_WN_NoHelper_Resolve(JSContext* cx, HandleObject obj,
+ HandleId id, bool* resolvedp) {
+ XPCCallContext ccx(cx, obj, nullptr, id);
+ XPCWrappedNative* wrapper = ccx.GetWrapper();
+ THROW_AND_RETURN_IF_BAD_WRAPPER(cx, wrapper);
+
+ XPCNativeSet* set = ccx.GetSet();
+ if (!set) {
+ return true;
+ }
+
+ // Don't resolve properties that are on our prototype.
+ if (ccx.GetInterface() && !ccx.GetStaticMemberIsLocal()) {
+ return true;
+ }
+
+ return DefinePropertyIfFound(
+ ccx, obj, id, set, nullptr, nullptr, wrapper->GetScope(), true, wrapper,
+ wrapper, nullptr, JSPROP_ENUMERATE | JSPROP_READONLY | JSPROP_PERMANENT,
+ resolvedp);
+}
+
+static const JSClassOps XPC_WN_NoHelper_JSClassOps = {
+ XPC_WN_OnlyIWrite_AddPropertyStub, // addProperty
+ XPC_WN_CannotDeletePropertyStub, // delProperty
+ XPC_WN_Shared_Enumerate, // enumerate
+ nullptr, // newEnumerate
+ XPC_WN_NoHelper_Resolve, // resolve
+ nullptr, // mayResolve
+ XPC_WN_NoHelper_Finalize, // finalize
+ nullptr, // call
+ nullptr, // construct
+ XPCWrappedNative::Trace, // trace
+};
+
+const js::ClassExtension XPC_WN_JSClassExtension = {
+ WrappedNativeObjectMoved, // objectMovedOp
+};
+
+const JSClass XPC_WN_NoHelper_JSClass = {
+ "XPCWrappedNative_NoHelper",
+ JSCLASS_IS_WRAPPED_NATIVE | JSCLASS_HAS_RESERVED_SLOTS(1) |
+ JSCLASS_SLOT0_IS_NSISUPPORTS | JSCLASS_FOREGROUND_FINALIZE,
+ &XPC_WN_NoHelper_JSClassOps,
+ JS_NULL_CLASS_SPEC,
+ &XPC_WN_JSClassExtension,
+ JS_NULL_OBJECT_OPS};
+
+/***************************************************************************/
+
+bool XPC_WN_MaybeResolvingPropertyStub(JSContext* cx, HandleObject obj,
+ HandleId id, HandleValue v) {
+ XPCCallContext ccx(cx, obj);
+ XPCWrappedNative* wrapper = ccx.GetWrapper();
+ THROW_AND_RETURN_IF_BAD_WRAPPER(cx, wrapper);
+
+ if (ccx.GetResolvingWrapper() == wrapper) {
+ return true;
+ }
+ return Throw(NS_ERROR_XPC_CANT_MODIFY_PROP_ON_WN, cx);
+}
+
+bool XPC_WN_MaybeResolvingDeletePropertyStub(JSContext* cx, HandleObject obj,
+ HandleId id,
+ ObjectOpResult& result) {
+ XPCCallContext ccx(cx, obj);
+ XPCWrappedNative* wrapper = ccx.GetWrapper();
+ THROW_AND_RETURN_IF_BAD_WRAPPER(cx, wrapper);
+
+ if (ccx.GetResolvingWrapper() == wrapper) {
+ return result.succeed();
+ }
+ return Throw(NS_ERROR_XPC_CANT_MODIFY_PROP_ON_WN, cx);
+}
+
+// macro fun!
+#define PRE_HELPER_STUB \
+ /* It's very important for "unwrapped" to be rooted here. */ \
+ RootedObject unwrapped(cx, js::CheckedUnwrapDynamic(obj, cx, false)); \
+ if (!unwrapped) { \
+ JS_ReportErrorASCII(cx, "Permission denied to operate on object."); \
+ return false; \
+ } \
+ if (!IsWrappedNativeReflector(unwrapped)) { \
+ return Throw(NS_ERROR_XPC_BAD_OP_ON_WN_PROTO, cx); \
+ } \
+ XPCWrappedNative* wrapper = XPCWrappedNative::Get(unwrapped); \
+ THROW_AND_RETURN_IF_BAD_WRAPPER(cx, wrapper); \
+ bool retval = true; \
+ nsresult rv = wrapper->GetScriptable()->
+
+#define POST_HELPER_STUB \
+ if (NS_FAILED(rv)) return Throw(rv, cx); \
+ return retval;
+
+bool XPC_WN_Helper_Call(JSContext* cx, unsigned argc, Value* vp) {
+ JS::CallArgs args = JS::CallArgsFromVp(argc, vp);
+ // N.B. we want obj to be the callee, not JS_THIS(cx, vp)
+ RootedObject obj(cx, &args.callee());
+
+ XPCCallContext ccx(cx, obj, nullptr, JS::VoidHandlePropertyKey, args.length(),
+ args.array(), args.rval().address());
+ if (!ccx.IsValid()) {
+ return false;
+ }
+
+ PRE_HELPER_STUB
+ Call(wrapper, cx, obj, args, &retval);
+ POST_HELPER_STUB
+}
+
+bool XPC_WN_Helper_Construct(JSContext* cx, unsigned argc, Value* vp) {
+ JS::CallArgs args = JS::CallArgsFromVp(argc, vp);
+ RootedObject obj(cx, &args.callee());
+ if (!obj) {
+ return false;
+ }
+
+ XPCCallContext ccx(cx, obj, nullptr, JS::VoidHandlePropertyKey, args.length(),
+ args.array(), args.rval().address());
+ if (!ccx.IsValid()) {
+ return false;
+ }
+
+ PRE_HELPER_STUB
+ Construct(wrapper, cx, obj, args, &retval);
+ POST_HELPER_STUB
+}
+
+static bool XPC_WN_Helper_HasInstance(JSContext* cx, unsigned argc, Value* vp) {
+ CallArgs args = CallArgsFromVp(argc, vp);
+ if (!args.requireAtLeast(cx, "WrappedNative[Symbol.hasInstance]", 1)) {
+ return false;
+ }
+
+ if (!args.thisv().isObject()) {
+ JS_ReportErrorASCII(
+ cx, "WrappedNative[Symbol.hasInstance]: unexpected this value");
+ return false;
+ }
+
+ RootedObject obj(cx, &args.thisv().toObject());
+ RootedValue val(cx, args.get(0));
+
+ bool retval2;
+ PRE_HELPER_STUB
+ HasInstance(wrapper, cx, obj, val, &retval2, &retval);
+ args.rval().setBoolean(retval2);
+ POST_HELPER_STUB
+}
+
+void XPC_WN_Helper_Finalize(JS::GCContext* gcx, JSObject* obj) {
+ WrappedNativeFinalize(gcx, obj, WN_HELPER);
+}
+
+// RAII class used to store the wrapper in the context when resolving a lazy
+// property on its JS reflector. This is used by XPC_WN_MaybeResolving to allow
+// adding properties while resolving.
+class MOZ_RAII AutoSetResolvingWrapper {
+ public:
+ AutoSetResolvingWrapper(XPCCallContext& ccx, XPCWrappedNative* wrapper)
+ : mCcx(ccx), mOldResolvingWrapper(ccx.SetResolvingWrapper(wrapper)) {}
+
+ ~AutoSetResolvingWrapper() {
+ (void)mCcx.SetResolvingWrapper(mOldResolvingWrapper);
+ }
+
+ private:
+ XPCCallContext& mCcx;
+ XPCWrappedNative* mOldResolvingWrapper;
+};
+
+bool XPC_WN_Helper_Resolve(JSContext* cx, HandleObject obj, HandleId id,
+ bool* resolvedp) {
+ nsresult rv = NS_OK;
+ bool retval = true;
+ bool resolved = false;
+ XPCCallContext ccx(cx, obj);
+ XPCWrappedNative* wrapper = ccx.GetWrapper();
+ THROW_AND_RETURN_IF_BAD_WRAPPER(cx, wrapper);
+
+ RootedId old(cx, ccx.SetResolveName(id));
+
+ nsCOMPtr<nsIXPCScriptable> scr = wrapper->GetScriptable();
+
+ // Resolve a Symbol.hasInstance property if we want custom `instanceof`
+ // behavior.
+ if (scr && scr->WantHasInstance() &&
+ id.isWellKnownSymbol(SymbolCode::hasInstance)) {
+ mozilla::Maybe<AutoSetResolvingWrapper> asrw;
+ if (scr->AllowPropModsDuringResolve()) {
+ asrw.emplace(ccx, wrapper);
+ }
+ if (!JS_DefineFunctionById(
+ cx, obj, id, XPC_WN_Helper_HasInstance, 1,
+ JSPROP_READONLY | JSPROP_PERMANENT | JSPROP_RESOLVING)) {
+ rv = NS_ERROR_FAILURE;
+ } else {
+ resolved = true;
+ }
+ }
+
+ if (scr && scr->WantResolve()) {
+ mozilla::Maybe<AutoSetResolvingWrapper> asrw;
+ if (scr->AllowPropModsDuringResolve()) {
+ asrw.emplace(ccx, wrapper);
+ }
+ rv = scr->Resolve(wrapper, cx, obj, id, &resolved, &retval);
+ }
+
+ old = ccx.SetResolveName(old);
+ MOZ_ASSERT(old == id, "bad nest");
+
+ if (NS_FAILED(rv)) {
+ return Throw(rv, cx);
+ }
+
+ if (resolved) {
+ *resolvedp = true;
+ } else if (wrapper->HasMutatedSet()) {
+ // We are here if scriptable did not resolve this property and
+ // it *might* be in the instance set but not the proto set.
+
+ XPCNativeSet* set = wrapper->GetSet();
+ XPCNativeSet* protoSet =
+ wrapper->HasProto() ? wrapper->GetProto()->GetSet() : nullptr;
+ XPCNativeMember* member = nullptr;
+ RefPtr<XPCNativeInterface> iface;
+ bool IsLocal = false;
+
+ if (set->FindMember(id, &member, &iface, protoSet, &IsLocal) && IsLocal) {
+ XPCWrappedNative* wrapperForInterfaceNames =
+ (scr && scr->DontReflectInterfaceNames()) ? nullptr : wrapper;
+
+ AutoSetResolvingWrapper asrw(ccx, wrapper);
+ retval = DefinePropertyIfFound(
+ ccx, obj, id, set, iface, member, wrapper->GetScope(), false,
+ wrapperForInterfaceNames, nullptr, scr, JSPROP_ENUMERATE, resolvedp);
+ }
+ }
+
+ return retval;
+}
+
+/***************************************************************************/
+
+bool XPC_WN_NewEnumerate(JSContext* cx, HandleObject obj,
+ MutableHandleIdVector properties,
+ bool enumerableOnly) {
+ XPCCallContext ccx(cx, obj);
+ XPCWrappedNative* wrapper = ccx.GetWrapper();
+ THROW_AND_RETURN_IF_BAD_WRAPPER(cx, wrapper);
+
+ nsCOMPtr<nsIXPCScriptable> scr = wrapper->GetScriptable();
+ if (!scr || !scr->WantNewEnumerate()) {
+ return Throw(NS_ERROR_XPC_BAD_OP_ON_WN_PROTO, cx);
+ }
+
+ if (!XPC_WN_Shared_Enumerate(cx, obj)) {
+ return false;
+ }
+
+ bool retval = true;
+ nsresult rv =
+ scr->NewEnumerate(wrapper, cx, obj, properties, enumerableOnly, &retval);
+ if (NS_FAILED(rv)) {
+ return Throw(rv, cx);
+ }
+ return retval;
+}
+
+/***************************************************************************/
+/***************************************************************************/
+
+// Compatibility hack.
+//
+// XPConnect used to do all sorts of funny tricks to find the "correct"
+// |this| object for a given method (often to the detriment of proper
+// call/apply). When these tricks were removed, a fair amount of chrome
+// code broke, because it was relying on being able to grab methods off
+// some XPCOM object (like the nsITelemetry service) and invoke them without
+// a proper |this|. So, if it's quite clear that we're in this situation and
+// about to use a |this| argument that just won't work, fix things up.
+//
+// This hack is only useful for getters/setters if someone sets an XPCOM object
+// as the prototype for a vanilla JS object and expects the XPCOM attributes to
+// work on the derived object, which we really don't want to support. But we
+// handle it anyway, for now, to minimize regression risk on an already-risky
+// landing.
+//
+// This hack is mainly useful for the NoHelper JSClass. We also fix up
+// Components.utils because it implements nsIXPCScriptable (giving it a custom
+// JSClass) but not nsIClassInfo (which would put the methods on a prototype).
+
+#define IS_NOHELPER_CLASS(clasp) (clasp == &XPC_WN_NoHelper_JSClass)
+#define IS_CU_CLASS(clasp) \
+ (clasp->name[0] == 'n' && !strcmp(clasp->name, "nsXPCComponents_Utils"))
+
+MOZ_ALWAYS_INLINE JSObject* FixUpThisIfBroken(JSObject* obj, JSObject* funobj) {
+ if (funobj) {
+ JSObject* parentObj =
+ &js::GetFunctionNativeReserved(funobj, XPC_FUNCTION_PARENT_OBJECT_SLOT)
+ .toObject();
+ const JSClass* parentClass = JS::GetClass(parentObj);
+ if (MOZ_UNLIKELY(
+ (IS_NOHELPER_CLASS(parentClass) || IS_CU_CLASS(parentClass)) &&
+ (JS::GetClass(obj) != parentClass))) {
+ return parentObj;
+ }
+ }
+ return obj;
+}
+
+bool XPC_WN_CallMethod(JSContext* cx, unsigned argc, Value* vp) {
+ JS::CallArgs args = JS::CallArgsFromVp(argc, vp);
+ MOZ_ASSERT(JS_TypeOfValue(cx, args.calleev()) == JSTYPE_FUNCTION,
+ "bad function");
+ RootedObject funobj(cx, &args.callee());
+
+ RootedObject obj(cx);
+ if (!args.computeThis(cx, &obj)) {
+ return false;
+ }
+
+ obj = FixUpThisIfBroken(obj, funobj);
+ XPCCallContext ccx(cx, obj, funobj, JS::VoidHandlePropertyKey, args.length(),
+ args.array(), vp);
+ XPCWrappedNative* wrapper = ccx.GetWrapper();
+ THROW_AND_RETURN_IF_BAD_WRAPPER(cx, wrapper);
+
+ RefPtr<XPCNativeInterface> iface;
+ XPCNativeMember* member;
+
+ if (!XPCNativeMember::GetCallInfo(funobj, &iface, &member)) {
+ return Throw(NS_ERROR_XPC_CANT_GET_METHOD_INFO, cx);
+ }
+ ccx.SetCallInfo(iface, member, false);
+ return XPCWrappedNative::CallMethod(ccx);
+}
+
+bool XPC_WN_GetterSetter(JSContext* cx, unsigned argc, Value* vp) {
+ JS::CallArgs args = JS::CallArgsFromVp(argc, vp);
+ MOZ_ASSERT(JS_TypeOfValue(cx, args.calleev()) == JSTYPE_FUNCTION,
+ "bad function");
+ RootedObject funobj(cx, &args.callee());
+
+ if (!args.thisv().isObject()) {
+ JS_ReportErrorASCII(
+ cx, "xpconnect getter/setter called on incompatible non-object");
+ return false;
+ }
+ RootedObject obj(cx, &args.thisv().toObject());
+
+ obj = FixUpThisIfBroken(obj, funobj);
+ XPCCallContext ccx(cx, obj, funobj, JS::VoidHandlePropertyKey, args.length(),
+ args.array(), vp);
+ XPCWrappedNative* wrapper = ccx.GetWrapper();
+ THROW_AND_RETURN_IF_BAD_WRAPPER(cx, wrapper);
+
+ RefPtr<XPCNativeInterface> iface;
+ XPCNativeMember* member;
+
+ if (!XPCNativeMember::GetCallInfo(funobj, &iface, &member)) {
+ return Throw(NS_ERROR_XPC_CANT_GET_METHOD_INFO, cx);
+ }
+
+ if (args.length() != 0 && member->IsWritableAttribute()) {
+ ccx.SetCallInfo(iface, member, true);
+ bool retval = XPCWrappedNative::SetAttribute(ccx);
+ if (retval) {
+ args.rval().set(args[0]);
+ }
+ return retval;
+ }
+ // else...
+
+ ccx.SetCallInfo(iface, member, false);
+ return XPCWrappedNative::GetAttribute(ccx);
+}
+
+/***************************************************************************/
+
+/* static */
+XPCWrappedNativeProto* XPCWrappedNativeProto::Get(JSObject* obj) {
+ MOZ_ASSERT(JS::GetClass(obj) == &XPC_WN_Proto_JSClass);
+ return JS::GetMaybePtrFromReservedSlot<XPCWrappedNativeProto>(obj, ProtoSlot);
+}
+
+/* static */
+XPCWrappedNativeTearOff* XPCWrappedNativeTearOff::Get(JSObject* obj) {
+ MOZ_ASSERT(JS::GetClass(obj) == &XPC_WN_Tearoff_JSClass);
+ return JS::GetMaybePtrFromReservedSlot<XPCWrappedNativeTearOff>(obj,
+ TearOffSlot);
+}
+
+static bool XPC_WN_Proto_Enumerate(JSContext* cx, HandleObject obj) {
+ MOZ_ASSERT(JS::GetClass(obj) == &XPC_WN_Proto_JSClass, "bad proto");
+ XPCWrappedNativeProto* self = XPCWrappedNativeProto::Get(obj);
+ if (!self) {
+ return false;
+ }
+
+ XPCNativeSet* set = self->GetSet();
+ if (!set) {
+ return false;
+ }
+
+ XPCCallContext ccx(cx);
+ if (!ccx.IsValid()) {
+ return false;
+ }
+
+ uint16_t interface_count = set->GetInterfaceCount();
+ XPCNativeInterface** interfaceArray = set->GetInterfaceArray();
+ for (uint16_t i = 0; i < interface_count; i++) {
+ XPCNativeInterface* iface = interfaceArray[i];
+ uint16_t member_count = iface->GetMemberCount();
+
+ for (uint16_t k = 0; k < member_count; k++) {
+ jsid name = iface->GetMemberAt(k)->GetName();
+ JS_MarkCrossZoneId(cx, name);
+ if (!xpc_ForcePropertyResolve(cx, obj, name)) {
+ return false;
+ }
+ }
+ }
+
+ return true;
+}
+
+static void XPC_WN_Proto_Finalize(JS::GCContext* gcx, JSObject* obj) {
+ // This can be null if xpc shutdown has already happened
+ XPCWrappedNativeProto* p = XPCWrappedNativeProto::Get(obj);
+ if (p) {
+ p->JSProtoObjectFinalized(gcx, obj);
+ }
+}
+
+static size_t XPC_WN_Proto_ObjectMoved(JSObject* obj, JSObject* old) {
+ // This can be null if xpc shutdown has already happened
+ XPCWrappedNativeProto* p = XPCWrappedNativeProto::Get(obj);
+ if (!p) {
+ return 0;
+ }
+
+ p->JSProtoObjectMoved(obj, old);
+ return 0;
+}
+
+/*****************************************************/
+
+static bool XPC_WN_OnlyIWrite_Proto_AddPropertyStub(JSContext* cx,
+ HandleObject obj,
+ HandleId id,
+ HandleValue v) {
+ MOZ_ASSERT(JS::GetClass(obj) == &XPC_WN_Proto_JSClass, "bad proto");
+
+ XPCWrappedNativeProto* self = XPCWrappedNativeProto::Get(obj);
+ if (!self) {
+ return false;
+ }
+
+ XPCCallContext ccx(cx);
+ if (!ccx.IsValid()) {
+ return false;
+ }
+
+ // Allow XPConnect to add the property only
+ if (ccx.GetResolveName() == id) {
+ return true;
+ }
+
+ return Throw(NS_ERROR_XPC_BAD_OP_ON_WN_PROTO, cx);
+}
+
+static bool XPC_WN_Proto_Resolve(JSContext* cx, HandleObject obj, HandleId id,
+ bool* resolvedp) {
+ MOZ_ASSERT(JS::GetClass(obj) == &XPC_WN_Proto_JSClass, "bad proto");
+
+ XPCWrappedNativeProto* self = XPCWrappedNativeProto::Get(obj);
+ if (!self) {
+ return false;
+ }
+
+ XPCCallContext ccx(cx);
+ if (!ccx.IsValid()) {
+ return false;
+ }
+
+ nsCOMPtr<nsIXPCScriptable> scr = self->GetScriptable();
+
+ return DefinePropertyIfFound(
+ ccx, obj, id, self->GetSet(), nullptr, nullptr, self->GetScope(), true,
+ nullptr, nullptr, scr,
+ JSPROP_READONLY | JSPROP_PERMANENT | JSPROP_ENUMERATE, resolvedp);
+}
+
+static const JSClassOps XPC_WN_Proto_JSClassOps = {
+ XPC_WN_OnlyIWrite_Proto_AddPropertyStub, // addProperty
+ XPC_WN_CannotDeletePropertyStub, // delProperty
+ XPC_WN_Proto_Enumerate, // enumerate
+ nullptr, // newEnumerate
+ XPC_WN_Proto_Resolve, // resolve
+ nullptr, // mayResolve
+ XPC_WN_Proto_Finalize, // finalize
+ nullptr, // call
+ nullptr, // construct
+ nullptr, // trace
+};
+
+static const js::ClassExtension XPC_WN_Proto_ClassExtension = {
+ XPC_WN_Proto_ObjectMoved, // objectMovedOp
+};
+
+const JSClass XPC_WN_Proto_JSClass = {
+ "XPC_WN_Proto_JSClass",
+ JSCLASS_HAS_RESERVED_SLOTS(XPCWrappedNativeProto::SlotCount) |
+ JSCLASS_FOREGROUND_FINALIZE,
+ &XPC_WN_Proto_JSClassOps,
+ JS_NULL_CLASS_SPEC,
+ &XPC_WN_Proto_ClassExtension,
+ JS_NULL_OBJECT_OPS};
+
+/***************************************************************************/
+
+static bool XPC_WN_TearOff_Enumerate(JSContext* cx, HandleObject obj) {
+ XPCCallContext ccx(cx, obj);
+ XPCWrappedNative* wrapper = ccx.GetWrapper();
+ THROW_AND_RETURN_IF_BAD_WRAPPER(cx, wrapper);
+
+ XPCWrappedNativeTearOff* to = ccx.GetTearOff();
+ XPCNativeInterface* iface;
+
+ if (!to || nullptr == (iface = to->GetInterface())) {
+ return Throw(NS_ERROR_XPC_BAD_OP_ON_WN_PROTO, cx);
+ }
+
+ uint16_t member_count = iface->GetMemberCount();
+ for (uint16_t k = 0; k < member_count; k++) {
+ jsid name = iface->GetMemberAt(k)->GetName();
+ JS_MarkCrossZoneId(cx, name);
+ if (!xpc_ForcePropertyResolve(cx, obj, name)) {
+ return false;
+ }
+ }
+
+ return true;
+}
+
+static bool XPC_WN_TearOff_Resolve(JSContext* cx, HandleObject obj, HandleId id,
+ bool* resolvedp) {
+ XPCCallContext ccx(cx, obj);
+ XPCWrappedNative* wrapper = ccx.GetWrapper();
+ THROW_AND_RETURN_IF_BAD_WRAPPER(cx, wrapper);
+
+ XPCWrappedNativeTearOff* to = ccx.GetTearOff();
+ XPCNativeInterface* iface;
+
+ if (!to || nullptr == (iface = to->GetInterface())) {
+ return Throw(NS_ERROR_XPC_BAD_OP_ON_WN_PROTO, cx);
+ }
+
+ return DefinePropertyIfFound(
+ ccx, obj, id, nullptr, iface, nullptr, wrapper->GetScope(), true, nullptr,
+ nullptr, nullptr, JSPROP_READONLY | JSPROP_PERMANENT | JSPROP_ENUMERATE,
+ resolvedp);
+}
+
+static void XPC_WN_TearOff_Finalize(JS::GCContext* gcx, JSObject* obj) {
+ XPCWrappedNativeTearOff* p = XPCWrappedNativeTearOff::Get(obj);
+ if (!p) {
+ return;
+ }
+ p->JSObjectFinalized();
+}
+
+static size_t XPC_WN_TearOff_ObjectMoved(JSObject* obj, JSObject* old) {
+ XPCWrappedNativeTearOff* p = XPCWrappedNativeTearOff::Get(obj);
+ if (!p) {
+ return 0;
+ }
+ p->JSObjectMoved(obj, old);
+ return 0;
+}
+
+static const JSClassOps XPC_WN_Tearoff_JSClassOps = {
+ XPC_WN_OnlyIWrite_AddPropertyStub, // addProperty
+ XPC_WN_CannotDeletePropertyStub, // delProperty
+ XPC_WN_TearOff_Enumerate, // enumerate
+ nullptr, // newEnumerate
+ XPC_WN_TearOff_Resolve, // resolve
+ nullptr, // mayResolve
+ XPC_WN_TearOff_Finalize, // finalize
+ nullptr, // call
+ nullptr, // construct
+ nullptr, // trace
+};
+
+static const js::ClassExtension XPC_WN_Tearoff_JSClassExtension = {
+ XPC_WN_TearOff_ObjectMoved, // objectMovedOp
+};
+
+const JSClass XPC_WN_Tearoff_JSClass = {
+ "WrappedNative_TearOff",
+ JSCLASS_HAS_RESERVED_SLOTS(XPCWrappedNativeTearOff::SlotCount) |
+ JSCLASS_FOREGROUND_FINALIZE,
+ &XPC_WN_Tearoff_JSClassOps, JS_NULL_CLASS_SPEC,
+ &XPC_WN_Tearoff_JSClassExtension};