Add m-esr52 at 52.6.0

1 files changed, 3563 insertions, 0 deletions

diff --git a/js/xpconnect/src/XPCComponents.cpp b/js/xpconnect/src/XPCComponents.cpp
new file mode 100644
index 000000000..ca78234c9
--- /dev/null
+++ b/js/xpconnect/src/XPCComponents.cpp
@@ -0,0 +1,3563 @@
+/* -*- 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/. */
+
+/* The "Components" xpcom objects for JavaScript. */
+
+#include "xpcprivate.h"
+#include "xpc_make_class.h"
+#include "xpcIJSModuleLoader.h"
+#include "XPCJSWeakReference.h"
+#include "WrapperFactory.h"
+#include "nsJSUtils.h"
+#include "mozJSComponentLoader.h"
+#include "nsContentUtils.h"
+#include "nsCycleCollector.h"
+#include "jsfriendapi.h"
+#include "js/StructuredClone.h"
+#include "mozilla/Attributes.h"
+#include "mozilla/jsipc/CrossProcessObjectWrappers.h"
+#include "mozilla/Preferences.h"
+#include "nsJSEnvironment.h"
+#include "mozilla/TimeStamp.h"
+#include "mozilla/XPTInterfaceInfoManager.h"
+#include "mozilla/dom/DOMException.h"
+#include "mozilla/dom/DOMExceptionBinding.h"
+#include "mozilla/dom/BindingUtils.h"
+#include "mozilla/dom/StructuredCloneTags.h"
+#include "mozilla/dom/WindowBinding.h"
+#include "nsZipArchive.h"
+#include "nsIDOMFileList.h"
+#include "nsWindowMemoryReporter.h"
+#include "nsDOMClassInfo.h"
+#include "ShimInterfaceInfo.h"
+#include "nsIAddonInterposition.h"
+#include "nsISimpleEnumerator.h"
+#include "nsPIDOMWindow.h"
+#include "nsGlobalWindow.h"
+
+using namespace mozilla;
+using namespace JS;
+using namespace js;
+using namespace xpc;
+using mozilla::dom::Exception;
+
+/***************************************************************************/
+// stuff used by all
+
+nsresult
+xpc::ThrowAndFail(nsresult errNum, JSContext* cx, bool* retval)
+{
+    XPCThrower::Throw(errNum, cx);
+    *retval = false;
+    return NS_OK;
+}
+
+static bool
+JSValIsInterfaceOfType(JSContext* cx, HandleValue v, REFNSIID iid)
+{
+
+    nsCOMPtr<nsIXPConnectWrappedNative> wn;
+    nsCOMPtr<nsISupports> iface;
+
+    if (v.isPrimitive())
+        return false;
+
+    nsXPConnect* xpc = nsXPConnect::XPConnect();
+    RootedObject obj(cx, &v.toObject());
+    return NS_SUCCEEDED(xpc->GetWrappedNativeOfJSObject(cx, obj, getter_AddRefs(wn))) && wn &&
+        NS_SUCCEEDED(wn->Native()->QueryInterface(iid, getter_AddRefs(iface))) && iface;
+}
+
+char*
+xpc::CloneAllAccess()
+{
+    static const char allAccess[] = "AllAccess";
+    return (char*)nsMemory::Clone(allAccess, sizeof(allAccess));
+}
+
+char*
+xpc::CheckAccessList(const char16_t* wideName, const char* const list[])
+{
+    nsAutoCString asciiName;
+    CopyUTF16toUTF8(nsDependentString(wideName), asciiName);
+
+    for (const char* const* p = list; *p; p++)
+        if (!strcmp(*p, asciiName.get()))
+            return CloneAllAccess();
+
+    return nullptr;
+}
+
+/***************************************************************************/
+/***************************************************************************/
+/***************************************************************************/
+
+
+class nsXPCComponents_Interfaces final :
+            public nsIXPCComponents_Interfaces,
+            public nsIXPCScriptable,
+            public nsIClassInfo
+{
+public:
+    // all the interface method declarations...
+    NS_DECL_ISUPPORTS
+    NS_DECL_NSIXPCCOMPONENTS_INTERFACES
+    NS_DECL_NSIXPCSCRIPTABLE
+    NS_DECL_NSICLASSINFO
+
+public:
+    nsXPCComponents_Interfaces();
+
+private:
+    virtual ~nsXPCComponents_Interfaces();
+
+    nsCOMArray<nsIInterfaceInfo> mInterfaces;
+};
+
+NS_IMETHODIMP
+nsXPCComponents_Interfaces::GetInterfaces(uint32_t* aCount, nsIID * **aArray)
+{
+    const uint32_t count = 2;
+    *aCount = count;
+    nsIID** array;
+    *aArray = array = static_cast<nsIID**>(moz_xmalloc(count * sizeof(nsIID*)));
+    if (!array)
+        return NS_ERROR_OUT_OF_MEMORY;
+
+    uint32_t index = 0;
+    nsIID* clone;
+#define PUSH_IID(id)                                                          \
+    clone = static_cast<nsIID*>(nsMemory::Clone(&NS_GET_IID( id ),           \
+                                                 sizeof(nsIID)));             \
+    if (!clone)                                                               \
+        goto oom;                                                             \
+    array[index++] = clone;
+
+    PUSH_IID(nsIXPCComponents_Interfaces)
+    PUSH_IID(nsIXPCScriptable)
+#undef PUSH_IID
+
+    return NS_OK;
+oom:
+    while (index)
+        free(array[--index]);
+    free(array);
+    *aArray = nullptr;
+    return NS_ERROR_OUT_OF_MEMORY;
+}
+
+NS_IMETHODIMP
+nsXPCComponents_Interfaces::GetScriptableHelper(nsIXPCScriptable** retval)
+{
+    *retval = nullptr;
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsXPCComponents_Interfaces::GetContractID(char * *aContractID)
+{
+    *aContractID = nullptr;
+    return NS_ERROR_NOT_AVAILABLE;
+}
+
+NS_IMETHODIMP
+nsXPCComponents_Interfaces::GetClassDescription(char * *aClassDescription)
+{
+    static const char classDescription[] = "XPCComponents_Interfaces";
+    *aClassDescription = (char*)nsMemory::Clone(classDescription, sizeof(classDescription));
+    return *aClassDescription ? NS_OK : NS_ERROR_OUT_OF_MEMORY;
+}
+
+NS_IMETHODIMP
+nsXPCComponents_Interfaces::GetClassID(nsCID * *aClassID)
+{
+    *aClassID = nullptr;
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsXPCComponents_Interfaces::GetFlags(uint32_t* aFlags)
+{
+    // Mark ourselves as a DOM object so that instances may be created in
+    // unprivileged scopes.
+    *aFlags = nsIClassInfo::DOM_OBJECT;
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsXPCComponents_Interfaces::GetClassIDNoAlloc(nsCID* aClassIDNoAlloc)
+{
+    return NS_ERROR_NOT_AVAILABLE;
+}
+
+nsXPCComponents_Interfaces::nsXPCComponents_Interfaces()
+{
+}
+
+nsXPCComponents_Interfaces::~nsXPCComponents_Interfaces()
+{
+    // empty
+}
+
+
+NS_INTERFACE_MAP_BEGIN(nsXPCComponents_Interfaces)
+  NS_INTERFACE_MAP_ENTRY(nsIXPCComponents_Interfaces)
+  NS_INTERFACE_MAP_ENTRY(nsIXPCScriptable)
+  NS_INTERFACE_MAP_ENTRY(nsIClassInfo)
+  NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIXPCComponents_Interfaces)
+NS_INTERFACE_MAP_END
+
+NS_IMPL_ADDREF(nsXPCComponents_Interfaces)
+NS_IMPL_RELEASE(nsXPCComponents_Interfaces)
+
+// The nsIXPCScriptable map declaration that will generate stubs for us...
+#define XPC_MAP_CLASSNAME           nsXPCComponents_Interfaces
+#define XPC_MAP_QUOTED_CLASSNAME   "nsXPCComponents_Interfaces"
+#define                             XPC_MAP_WANT_RESOLVE
+#define                             XPC_MAP_WANT_NEWENUMERATE
+#define XPC_MAP_FLAGS               nsIXPCScriptable::ALLOW_PROP_MODS_DURING_RESOLVE
+#include "xpc_map_end.h" /* This will #undef the above */
+
+
+NS_IMETHODIMP
+nsXPCComponents_Interfaces::NewEnumerate(nsIXPConnectWrappedNative* wrapper,
+                                         JSContext* cx, JSObject* obj,
+                                         JS::AutoIdVector& properties,
+                                         bool* _retval)
+{
+
+    // Lazily init the list of interfaces when someone tries to
+    // enumerate them.
+    if (mInterfaces.IsEmpty()) {
+        XPTInterfaceInfoManager::GetSingleton()->
+            GetScriptableInterfaces(mInterfaces);
+    }
+
+    if (!properties.reserve(mInterfaces.Length())) {
+        *_retval = false;
+        return NS_OK;
+    }
+
+    for (uint32_t index = 0; index < mInterfaces.Length(); index++) {
+        nsIInterfaceInfo* interface = mInterfaces.SafeElementAt(index);
+        if (!interface)
+            continue;
+
+        const char* name;
+        if (NS_SUCCEEDED(interface->GetNameShared(&name)) && name) {
+            RootedString idstr(cx, JS_NewStringCopyZ(cx, name));
+            if (!idstr) {
+                *_retval = false;
+                return NS_OK;
+            }
+
+            RootedId id(cx);
+            if (!JS_StringToId(cx, idstr, &id)) {
+                *_retval = false;
+                return NS_OK;
+            }
+
+            properties.infallibleAppend(id);
+        }
+    }
+
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsXPCComponents_Interfaces::Resolve(nsIXPConnectWrappedNative* wrapper,
+                                    JSContext* cx, JSObject* objArg,
+                                    jsid idArg, bool* resolvedp,
+                                    bool* _retval)
+{
+    RootedObject obj(cx, objArg);
+    RootedId id(cx, idArg);
+
+    if (!JSID_IS_STRING(id))
+        return NS_OK;
+
+    JSAutoByteString name;
+    RootedString str(cx, JSID_TO_STRING(id));
+
+    // we only allow interfaces by name here
+    if (name.encodeLatin1(cx, str) && name.ptr()[0] != '{') {
+        nsCOMPtr<nsIInterfaceInfo> info =
+            ShimInterfaceInfo::MaybeConstruct(name.ptr(), cx);
+        if (!info) {
+            XPTInterfaceInfoManager::GetSingleton()->
+                GetInfoForName(name.ptr(), getter_AddRefs(info));
+        }
+        if (!info)
+            return NS_OK;
+
+        nsCOMPtr<nsIJSIID> nsid = nsJSIID::NewID(info);
+
+        if (nsid) {
+            nsXPConnect* xpc = nsXPConnect::XPConnect();
+            RootedObject idobj(cx);
+            if (NS_SUCCEEDED(xpc->WrapNative(cx, obj,
+                                             static_cast<nsIJSIID*>(nsid),
+                                             NS_GET_IID(nsIJSIID),
+                                             idobj.address()))) {
+                if (idobj) {
+                    *resolvedp = true;
+                    *_retval = JS_DefinePropertyById(cx, obj, id, idobj,
+                                                     JSPROP_ENUMERATE |
+                                                     JSPROP_READONLY |
+                                                     JSPROP_PERMANENT |
+                                                     JSPROP_RESOLVING);
+                }
+            }
+        }
+    }
+    return NS_OK;
+}
+
+/***************************************************************************/
+/***************************************************************************/
+/***************************************************************************/
+
+class nsXPCComponents_InterfacesByID final :
+            public nsIXPCComponents_InterfacesByID,
+            public nsIXPCScriptable,
+            public nsIClassInfo
+{
+public:
+    // all the interface method declarations...
+    NS_DECL_ISUPPORTS
+    NS_DECL_NSIXPCCOMPONENTS_INTERFACESBYID
+    NS_DECL_NSIXPCSCRIPTABLE
+    NS_DECL_NSICLASSINFO
+
+public:
+    nsXPCComponents_InterfacesByID();
+
+private:
+    virtual ~nsXPCComponents_InterfacesByID();
+
+    nsCOMArray<nsIInterfaceInfo> mInterfaces;
+};
+
+/***************************************************************************/
+NS_IMETHODIMP
+nsXPCComponents_InterfacesByID::GetInterfaces(uint32_t* aCount, nsIID * **aArray)
+{
+    const uint32_t count = 2;
+    *aCount = count;
+    nsIID** array;
+    *aArray = array = static_cast<nsIID**>(moz_xmalloc(count * sizeof(nsIID*)));
+    if (!array)
+        return NS_ERROR_OUT_OF_MEMORY;
+
+    uint32_t index = 0;
+    nsIID* clone;
+#define PUSH_IID(id)                                                          \
+    clone = static_cast<nsIID*>(nsMemory::Clone(&NS_GET_IID( id ),           \
+                                                 sizeof(nsIID)));             \
+    if (!clone)                                                               \
+        goto oom;                                                             \
+    array[index++] = clone;
+
+    PUSH_IID(nsIXPCComponents_InterfacesByID)
+    PUSH_IID(nsIXPCScriptable)
+#undef PUSH_IID
+
+    return NS_OK;
+oom:
+    while (index)
+        free(array[--index]);
+    free(array);
+    *aArray = nullptr;
+    return NS_ERROR_OUT_OF_MEMORY;
+}
+
+NS_IMETHODIMP
+nsXPCComponents_InterfacesByID::GetScriptableHelper(nsIXPCScriptable** retval)
+{
+    *retval = nullptr;
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsXPCComponents_InterfacesByID::GetContractID(char * *aContractID)
+{
+    *aContractID = nullptr;
+    return NS_ERROR_NOT_AVAILABLE;
+}
+
+NS_IMETHODIMP
+nsXPCComponents_InterfacesByID::GetClassDescription(char * *aClassDescription)
+{
+    static const char classDescription[] = "XPCComponents_InterfacesByID";
+    *aClassDescription = (char*)nsMemory::Clone(classDescription, sizeof(classDescription));
+    return *aClassDescription ? NS_OK : NS_ERROR_OUT_OF_MEMORY;
+}
+
+NS_IMETHODIMP
+nsXPCComponents_InterfacesByID::GetClassID(nsCID * *aClassID)
+{
+    *aClassID = nullptr;
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsXPCComponents_InterfacesByID::GetFlags(uint32_t* aFlags)
+{
+    // Mark ourselves as a DOM object so that instances may be created in
+    // unprivileged scopes.
+    *aFlags = nsIClassInfo::DOM_OBJECT;
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsXPCComponents_InterfacesByID::GetClassIDNoAlloc(nsCID* aClassIDNoAlloc)
+{
+    return NS_ERROR_NOT_AVAILABLE;
+}
+
+nsXPCComponents_InterfacesByID::nsXPCComponents_InterfacesByID()
+{
+}
+
+nsXPCComponents_InterfacesByID::~nsXPCComponents_InterfacesByID()
+{
+    // empty
+}
+
+NS_INTERFACE_MAP_BEGIN(nsXPCComponents_InterfacesByID)
+  NS_INTERFACE_MAP_ENTRY(nsIXPCComponents_InterfacesByID)
+  NS_INTERFACE_MAP_ENTRY(nsIXPCScriptable)
+  NS_INTERFACE_MAP_ENTRY(nsIClassInfo)
+  NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIXPCComponents_InterfacesByID)
+NS_INTERFACE_MAP_END
+
+NS_IMPL_ADDREF(nsXPCComponents_InterfacesByID)
+NS_IMPL_RELEASE(nsXPCComponents_InterfacesByID)
+
+// The nsIXPCScriptable map declaration that will generate stubs for us...
+#define XPC_MAP_CLASSNAME           nsXPCComponents_InterfacesByID
+#define XPC_MAP_QUOTED_CLASSNAME   "nsXPCComponents_InterfacesByID"
+#define                             XPC_MAP_WANT_RESOLVE
+#define                             XPC_MAP_WANT_NEWENUMERATE
+#define XPC_MAP_FLAGS               nsIXPCScriptable::ALLOW_PROP_MODS_DURING_RESOLVE
+#include "xpc_map_end.h" /* This will #undef the above */
+
+NS_IMETHODIMP
+nsXPCComponents_InterfacesByID::NewEnumerate(nsIXPConnectWrappedNative* wrapper,
+                                             JSContext* cx, JSObject* obj,
+                                             JS::AutoIdVector& properties,
+                                             bool* _retval)
+{
+
+    if (mInterfaces.IsEmpty()) {
+        XPTInterfaceInfoManager::GetSingleton()->
+            GetScriptableInterfaces(mInterfaces);
+    }
+
+    if (!properties.reserve(mInterfaces.Length())) {
+        *_retval = false;
+        return NS_OK;
+    }
+
+    for (uint32_t index = 0; index < mInterfaces.Length(); index++) {
+        nsIInterfaceInfo* interface = mInterfaces.SafeElementAt(index);
+        if (!interface)
+            continue;
+
+        nsIID const* iid;
+        if (NS_SUCCEEDED(interface->GetIIDShared(&iid))) {
+            char idstr[NSID_LENGTH];
+            iid->ToProvidedString(idstr);
+            RootedString jsstr(cx, JS_NewStringCopyZ(cx, idstr));
+            if (!jsstr) {
+                *_retval = false;
+                return NS_OK;
+            }
+
+            RootedId id(cx);
+            if (!JS_StringToId(cx, jsstr, &id)) {
+                *_retval = false;
+                return NS_OK;
+            }
+
+            properties.infallibleAppend(id);
+        }
+    }
+
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsXPCComponents_InterfacesByID::Resolve(nsIXPConnectWrappedNative* wrapper,
+                                        JSContext* cx, JSObject* objArg,
+                                        jsid idArg, bool* resolvedp,
+                                        bool* _retval)
+{
+    RootedObject obj(cx, objArg);
+    RootedId id(cx, idArg);
+
+    if (!JSID_IS_STRING(id))
+        return NS_OK;
+
+    RootedString str(cx, JSID_TO_STRING(id));
+    if (38 != JS_GetStringLength(str))
+        return NS_OK;
+
+    JSAutoByteString utf8str;
+    if (utf8str.encodeUtf8(cx, str)) {
+        nsID iid;
+        if (!iid.Parse(utf8str.ptr()))
+            return NS_OK;
+
+        nsCOMPtr<nsIInterfaceInfo> info;
+        XPTInterfaceInfoManager::GetSingleton()->
+            GetInfoForIID(&iid, getter_AddRefs(info));
+        if (!info)
+            return NS_OK;
+
+        nsCOMPtr<nsIJSIID> nsid = nsJSIID::NewID(info);
+
+        if (!nsid)
+            return NS_ERROR_OUT_OF_MEMORY;
+
+        nsXPConnect* xpc = nsXPConnect::XPConnect();
+        RootedObject idobj(cx);
+        if (NS_SUCCEEDED(xpc->WrapNative(cx, obj,
+                                         static_cast<nsIJSIID*>(nsid),
+                                         NS_GET_IID(nsIJSIID),
+                                         idobj.address()))) {
+            if (idobj) {
+                *resolvedp = true;
+                *_retval =
+                    JS_DefinePropertyById(cx, obj, id, idobj,
+                                          JSPROP_ENUMERATE |
+                                          JSPROP_READONLY |
+                                          JSPROP_PERMANENT |
+                                          JSPROP_RESOLVING);
+            }
+        }
+    }
+    return NS_OK;
+}
+
+/***************************************************************************/
+/***************************************************************************/
+/***************************************************************************/
+
+
+
+class nsXPCComponents_Classes final :
+  public nsIXPCComponents_Classes,
+  public nsIXPCScriptable,
+  public nsIClassInfo
+{
+public:
+    // all the interface method declarations...
+    NS_DECL_ISUPPORTS
+    NS_DECL_NSIXPCCOMPONENTS_CLASSES
+    NS_DECL_NSIXPCSCRIPTABLE
+    NS_DECL_NSICLASSINFO
+
+public:
+    nsXPCComponents_Classes();
+
+private:
+    virtual ~nsXPCComponents_Classes();
+};
+
+/***************************************************************************/
+NS_IMETHODIMP
+nsXPCComponents_Classes::GetInterfaces(uint32_t* aCount, nsIID * **aArray)
+{
+    const uint32_t count = 2;
+    *aCount = count;
+    nsIID** array;
+    *aArray = array = static_cast<nsIID**>(moz_xmalloc(count * sizeof(nsIID*)));
+    if (!array)
+        return NS_ERROR_OUT_OF_MEMORY;
+
+    uint32_t index = 0;
+    nsIID* clone;
+#define PUSH_IID(id)                                                          \
+    clone = static_cast<nsIID*>(nsMemory::Clone(&NS_GET_IID( id ),           \
+                                                 sizeof(nsIID)));             \
+    if (!clone)                                                               \
+        goto oom;                                                             \
+    array[index++] = clone;
+
+    PUSH_IID(nsIXPCComponents_Classes)
+    PUSH_IID(nsIXPCScriptable)
+#undef PUSH_IID
+
+    return NS_OK;
+oom:
+    while (index)
+        free(array[--index]);
+    free(array);
+    *aArray = nullptr;
+    return NS_ERROR_OUT_OF_MEMORY;
+}
+
+NS_IMETHODIMP
+nsXPCComponents_Classes::GetScriptableHelper(nsIXPCScriptable** retval)
+{
+    *retval = nullptr;
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsXPCComponents_Classes::GetContractID(char * *aContractID)
+{
+    *aContractID = nullptr;
+    return NS_ERROR_NOT_AVAILABLE;
+}
+
+NS_IMETHODIMP
+nsXPCComponents_Classes::GetClassDescription(char * *aClassDescription)
+{
+    static const char classDescription[] = "XPCComponents_Classes";
+    *aClassDescription = (char*)nsMemory::Clone(classDescription, sizeof(classDescription));
+    return *aClassDescription ? NS_OK : NS_ERROR_OUT_OF_MEMORY;
+}
+
+NS_IMETHODIMP
+nsXPCComponents_Classes::GetClassID(nsCID * *aClassID)
+{
+    *aClassID = nullptr;
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsXPCComponents_Classes::GetFlags(uint32_t* aFlags)
+{
+    *aFlags = 0;
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsXPCComponents_Classes::GetClassIDNoAlloc(nsCID* aClassIDNoAlloc)
+{
+    return NS_ERROR_NOT_AVAILABLE;
+}
+
+nsXPCComponents_Classes::nsXPCComponents_Classes()
+{
+}
+
+nsXPCComponents_Classes::~nsXPCComponents_Classes()
+{
+    // empty
+}
+
+NS_INTERFACE_MAP_BEGIN(nsXPCComponents_Classes)
+  NS_INTERFACE_MAP_ENTRY(nsIXPCComponents_Classes)
+  NS_INTERFACE_MAP_ENTRY(nsIXPCScriptable)
+  NS_INTERFACE_MAP_ENTRY(nsIClassInfo)
+  NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIXPCComponents_Classes)
+NS_INTERFACE_MAP_END
+
+NS_IMPL_ADDREF(nsXPCComponents_Classes)
+NS_IMPL_RELEASE(nsXPCComponents_Classes)
+
+// The nsIXPCScriptable map declaration that will generate stubs for us...
+#define XPC_MAP_CLASSNAME           nsXPCComponents_Classes
+#define XPC_MAP_QUOTED_CLASSNAME   "nsXPCComponents_Classes"
+#define                             XPC_MAP_WANT_RESOLVE
+#define                             XPC_MAP_WANT_NEWENUMERATE
+#define XPC_MAP_FLAGS               nsIXPCScriptable::ALLOW_PROP_MODS_DURING_RESOLVE
+#include "xpc_map_end.h" /* This will #undef the above */
+
+NS_IMETHODIMP
+nsXPCComponents_Classes::NewEnumerate(nsIXPConnectWrappedNative* wrapper,
+                                      JSContext* cx, JSObject* obj,
+                                      JS::AutoIdVector& properties,
+                                      bool* _retval)
+{
+    nsCOMPtr<nsIComponentRegistrar> compMgr;
+    if (NS_FAILED(NS_GetComponentRegistrar(getter_AddRefs(compMgr))) || !compMgr)
+        return NS_ERROR_UNEXPECTED;
+
+    nsCOMPtr<nsISimpleEnumerator> e;
+    if (NS_FAILED(compMgr->EnumerateContractIDs(getter_AddRefs(e))) || !e)
+        return NS_ERROR_UNEXPECTED;
+
+    bool hasMore;
+    nsCOMPtr<nsISupports> isup;
+    while(NS_SUCCEEDED(e->HasMoreElements(&hasMore)) && hasMore &&
+          NS_SUCCEEDED(e->GetNext(getter_AddRefs(isup))) && isup) {
+        nsCOMPtr<nsISupportsCString> holder(do_QueryInterface(isup));
+        if (!holder)
+            continue;
+
+        nsAutoCString name;
+        if (NS_SUCCEEDED(holder->GetData(name))) {
+            RootedString idstr(cx, JS_NewStringCopyN(cx, name.get(), name.Length()));
+            if (!idstr) {
+                *_retval = false;
+                return NS_OK;
+            }
+
+            RootedId id(cx);
+            if (!JS_StringToId(cx, idstr, &id)) {
+                *_retval = false;
+                return NS_OK;
+            }
+
+            if (!properties.append(id)) {
+                *_retval = false;
+                return NS_OK;
+            }
+        }
+    }
+
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsXPCComponents_Classes::Resolve(nsIXPConnectWrappedNative* wrapper,
+                                 JSContext* cx, JSObject* objArg,
+                                 jsid idArg, bool* resolvedp,
+                                 bool* _retval)
+
+{
+    RootedId id(cx, idArg);
+    RootedObject obj(cx, objArg);
+
+    JSAutoByteString name;
+    if (JSID_IS_STRING(id) &&
+        name.encodeLatin1(cx, JSID_TO_STRING(id)) &&
+        name.ptr()[0] != '{') { // we only allow contractids here
+        nsCOMPtr<nsIJSCID> nsid = nsJSCID::NewID(name.ptr());
+        if (nsid) {
+            nsXPConnect* xpc = nsXPConnect::XPConnect();
+            RootedObject idobj(cx);
+            if (NS_SUCCEEDED(xpc->WrapNative(cx, obj,
+                                             static_cast<nsIJSCID*>(nsid),
+                                             NS_GET_IID(nsIJSCID),
+                                             idobj.address()))) {
+                if (idobj) {
+                    *resolvedp = true;
+                    *_retval = JS_DefinePropertyById(cx, obj, id, idobj,
+                                                     JSPROP_ENUMERATE |
+                                                     JSPROP_READONLY |
+                                                     JSPROP_PERMANENT |
+                                                     JSPROP_RESOLVING);
+                }
+            }
+        }
+    }
+    return NS_OK;
+}
+
+/***************************************************************************/
+/***************************************************************************/
+/***************************************************************************/
+
+class nsXPCComponents_ClassesByID final :
+  public nsIXPCComponents_ClassesByID,
+  public nsIXPCScriptable,
+  public nsIClassInfo
+{
+public:
+    // all the interface method declarations...
+    NS_DECL_ISUPPORTS
+    NS_DECL_NSIXPCCOMPONENTS_CLASSESBYID
+    NS_DECL_NSIXPCSCRIPTABLE
+    NS_DECL_NSICLASSINFO
+
+public:
+    nsXPCComponents_ClassesByID();
+
+private:
+    virtual ~nsXPCComponents_ClassesByID();
+};
+
+/***************************************************************************/
+NS_IMETHODIMP
+nsXPCComponents_ClassesByID::GetInterfaces(uint32_t* aCount, nsIID * **aArray)
+{
+    const uint32_t count = 2;
+    *aCount = count;
+    nsIID** array;
+    *aArray = array = static_cast<nsIID**>(moz_xmalloc(count * sizeof(nsIID*)));
+    if (!array)
+        return NS_ERROR_OUT_OF_MEMORY;
+
+    uint32_t index = 0;
+    nsIID* clone;
+#define PUSH_IID(id)                                                          \
+    clone = static_cast<nsIID*>(nsMemory::Clone(&NS_GET_IID( id ),           \
+                                                 sizeof(nsIID)));             \
+    if (!clone)                                                               \
+        goto oom;                                                             \
+    array[index++] = clone;
+
+    PUSH_IID(nsIXPCComponents_ClassesByID)
+    PUSH_IID(nsIXPCScriptable)
+#undef PUSH_IID
+
+    return NS_OK;
+oom:
+    while (index)
+        free(array[--index]);
+    free(array);
+    *aArray = nullptr;
+    return NS_ERROR_OUT_OF_MEMORY;
+}
+
+NS_IMETHODIMP
+nsXPCComponents_ClassesByID::GetScriptableHelper(nsIXPCScriptable** retval)
+{
+    *retval = nullptr;
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsXPCComponents_ClassesByID::GetContractID(char * *aContractID)
+{
+    *aContractID = nullptr;
+    return NS_ERROR_NOT_AVAILABLE;
+}
+
+NS_IMETHODIMP
+nsXPCComponents_ClassesByID::GetClassDescription(char * *aClassDescription)
+{
+    static const char classDescription[] = "XPCComponents_ClassesByID";
+    *aClassDescription = (char*)nsMemory::Clone(classDescription, sizeof(classDescription));
+    return *aClassDescription ? NS_OK : NS_ERROR_OUT_OF_MEMORY;
+}
+
+NS_IMETHODIMP
+nsXPCComponents_ClassesByID::GetClassID(nsCID * *aClassID)
+{
+    *aClassID = nullptr;
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsXPCComponents_ClassesByID::GetFlags(uint32_t* aFlags)
+{
+    *aFlags = 0;
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsXPCComponents_ClassesByID::GetClassIDNoAlloc(nsCID* aClassIDNoAlloc)
+{
+    return NS_ERROR_NOT_AVAILABLE;
+}
+
+nsXPCComponents_ClassesByID::nsXPCComponents_ClassesByID()
+{
+}
+
+nsXPCComponents_ClassesByID::~nsXPCComponents_ClassesByID()
+{
+    // empty
+}
+
+NS_INTERFACE_MAP_BEGIN(nsXPCComponents_ClassesByID)
+  NS_INTERFACE_MAP_ENTRY(nsIXPCComponents_ClassesByID)
+  NS_INTERFACE_MAP_ENTRY(nsIXPCScriptable)
+  NS_INTERFACE_MAP_ENTRY(nsIClassInfo)
+  NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIXPCComponents_ClassesByID)
+NS_INTERFACE_MAP_END
+
+NS_IMPL_ADDREF(nsXPCComponents_ClassesByID)
+NS_IMPL_RELEASE(nsXPCComponents_ClassesByID)
+
+// The nsIXPCScriptable map declaration that will generate stubs for us...
+#define XPC_MAP_CLASSNAME           nsXPCComponents_ClassesByID
+#define XPC_MAP_QUOTED_CLASSNAME   "nsXPCComponents_ClassesByID"
+#define                             XPC_MAP_WANT_RESOLVE
+#define                             XPC_MAP_WANT_NEWENUMERATE
+#define XPC_MAP_FLAGS               nsIXPCScriptable::ALLOW_PROP_MODS_DURING_RESOLVE
+#include "xpc_map_end.h" /* This will #undef the above */
+
+NS_IMETHODIMP
+nsXPCComponents_ClassesByID::NewEnumerate(nsIXPConnectWrappedNative* wrapper,
+                                          JSContext* cx, JSObject* obj,
+                                          JS::AutoIdVector& properties,
+                                          bool* _retval)
+{
+
+    nsCOMPtr<nsIComponentRegistrar> compMgr;
+    if (NS_FAILED(NS_GetComponentRegistrar(getter_AddRefs(compMgr))) || !compMgr)
+        return NS_ERROR_UNEXPECTED;
+
+    nsISimpleEnumerator* e;
+    if (NS_FAILED(compMgr->EnumerateCIDs(&e)) || !e)
+        return NS_ERROR_UNEXPECTED;
+
+    bool hasMore;
+    nsCOMPtr<nsISupports> isup;
+    while(NS_SUCCEEDED(e->HasMoreElements(&hasMore)) && hasMore &&
+          NS_SUCCEEDED(e->GetNext(getter_AddRefs(isup))) && isup) {
+        nsCOMPtr<nsISupportsID> holder(do_QueryInterface(isup));
+        if (!holder)
+            continue;
+
+        char* name;
+        if (NS_SUCCEEDED(holder->ToString(&name)) && name) {
+            RootedString idstr(cx, JS_NewStringCopyZ(cx, name));
+            if (!idstr) {
+                *_retval = false;
+                return NS_OK;
+            }
+
+            RootedId id(cx);
+            if (!JS_StringToId(cx, idstr, &id)) {
+                *_retval = false;
+                return NS_OK;
+            }
+
+            if (!properties.append(id)) {
+                *_retval = false;
+                return NS_OK;
+            }
+        }
+    }
+
+    return NS_OK;
+}
+
+static bool
+IsRegisteredCLSID(const char* str)
+{
+    bool registered;
+    nsID id;
+
+    if (!id.Parse(str))
+        return false;
+
+    nsCOMPtr<nsIComponentRegistrar> compMgr;
+    if (NS_FAILED(NS_GetComponentRegistrar(getter_AddRefs(compMgr))) || !compMgr ||
+        NS_FAILED(compMgr->IsCIDRegistered(id, &registered)))
+        return false;
+
+    return registered;
+}
+
+NS_IMETHODIMP
+nsXPCComponents_ClassesByID::Resolve(nsIXPConnectWrappedNative* wrapper,
+                                     JSContext* cx, JSObject* objArg,
+                                     jsid idArg, bool* resolvedp,
+                                     bool* _retval)
+{
+    RootedObject obj(cx, objArg);
+    RootedId id(cx, idArg);
+
+    if (!JSID_IS_STRING(id))
+        return NS_OK;
+
+    JSAutoByteString name;
+    RootedString str(cx, JSID_TO_STRING(id));
+    if (name.encodeLatin1(cx, str) && name.ptr()[0] == '{' &&
+        IsRegisteredCLSID(name.ptr())) // we only allow canonical CLSIDs here
+    {
+        nsCOMPtr<nsIJSCID> nsid = nsJSCID::NewID(name.ptr());
+        if (nsid) {
+            nsXPConnect* xpc = nsXPConnect::XPConnect();
+            RootedObject idobj(cx);
+            if (NS_SUCCEEDED(xpc->WrapNative(cx, obj,
+                                             static_cast<nsIJSCID*>(nsid),
+                                             NS_GET_IID(nsIJSCID),
+                                             idobj.address()))) {
+                if (idobj) {
+                    *resolvedp = true;
+                    *_retval = JS_DefinePropertyById(cx, obj, id, idobj,
+                                                     JSPROP_ENUMERATE |
+                                                     JSPROP_READONLY |
+                                                     JSPROP_PERMANENT |
+                                                     JSPROP_RESOLVING);
+                }
+            }
+        }
+    }
+    return NS_OK;
+}
+
+
+/***************************************************************************/
+
+// Currently the possible results do not change at runtime, so they are only
+// cached once (unlike ContractIDs, CLSIDs, and IIDs)
+
+class nsXPCComponents_Results final :
+  public nsIXPCComponents_Results,
+  public nsIXPCScriptable,
+  public nsIClassInfo
+{
+public:
+    // all the interface method declarations...
+    NS_DECL_ISUPPORTS
+    NS_DECL_NSIXPCCOMPONENTS_RESULTS
+    NS_DECL_NSIXPCSCRIPTABLE
+    NS_DECL_NSICLASSINFO
+
+public:
+    nsXPCComponents_Results();
+
+private:
+    virtual ~nsXPCComponents_Results();
+};
+
+/***************************************************************************/
+NS_IMETHODIMP
+nsXPCComponents_Results::GetInterfaces(uint32_t* aCount, nsIID * **aArray)
+{
+    const uint32_t count = 2;
+    *aCount = count;
+    nsIID** array;
+    *aArray = array = static_cast<nsIID**>(moz_xmalloc(count * sizeof(nsIID*)));
+    if (!array)
+        return NS_ERROR_OUT_OF_MEMORY;
+
+    uint32_t index = 0;
+    nsIID* clone;
+#define PUSH_IID(id)                                                          \
+    clone = static_cast<nsIID*>(nsMemory::Clone(&NS_GET_IID( id ),           \
+                                                 sizeof(nsIID)));             \
+    if (!clone)                                                               \
+        goto oom;                                                             \
+    array[index++] = clone;
+
+    PUSH_IID(nsIXPCComponents_Results)
+    PUSH_IID(nsIXPCScriptable)
+#undef PUSH_IID
+
+    return NS_OK;
+oom:
+    while (index)
+        free(array[--index]);
+    free(array);
+    *aArray = nullptr;
+    return NS_ERROR_OUT_OF_MEMORY;
+}
+
+NS_IMETHODIMP
+nsXPCComponents_Results::GetScriptableHelper(nsIXPCScriptable** retval)
+{
+    *retval = nullptr;
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsXPCComponents_Results::GetContractID(char * *aContractID)
+{
+    *aContractID = nullptr;
+    return NS_ERROR_NOT_AVAILABLE;
+}
+
+NS_IMETHODIMP
+nsXPCComponents_Results::GetClassDescription(char * *aClassDescription)
+{
+    static const char classDescription[] = "XPCComponents_Results";
+    *aClassDescription = (char*)nsMemory::Clone(classDescription, sizeof(classDescription));
+    return *aClassDescription ? NS_OK : NS_ERROR_OUT_OF_MEMORY;
+}
+
+NS_IMETHODIMP
+nsXPCComponents_Results::GetClassID(nsCID * *aClassID)
+{
+    *aClassID = nullptr;
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsXPCComponents_Results::GetFlags(uint32_t* aFlags)
+{
+    // Mark ourselves as a DOM object so that instances may be created in
+    // unprivileged scopes.
+    *aFlags = nsIClassInfo::DOM_OBJECT;
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsXPCComponents_Results::GetClassIDNoAlloc(nsCID* aClassIDNoAlloc)
+{
+    return NS_ERROR_NOT_AVAILABLE;
+}
+
+nsXPCComponents_Results::nsXPCComponents_Results()
+{
+}
+
+nsXPCComponents_Results::~nsXPCComponents_Results()
+{
+    // empty
+}
+
+NS_INTERFACE_MAP_BEGIN(nsXPCComponents_Results)
+  NS_INTERFACE_MAP_ENTRY(nsIXPCComponents_Results)
+  NS_INTERFACE_MAP_ENTRY(nsIXPCScriptable)
+  NS_INTERFACE_MAP_ENTRY(nsIClassInfo)
+  NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIXPCComponents_Results)
+NS_INTERFACE_MAP_END
+
+NS_IMPL_ADDREF(nsXPCComponents_Results)
+NS_IMPL_RELEASE(nsXPCComponents_Results)
+
+// The nsIXPCScriptable map declaration that will generate stubs for us...
+#define XPC_MAP_CLASSNAME           nsXPCComponents_Results
+#define XPC_MAP_QUOTED_CLASSNAME   "nsXPCComponents_Results"
+#define                             XPC_MAP_WANT_RESOLVE
+#define                             XPC_MAP_WANT_NEWENUMERATE
+#define XPC_MAP_FLAGS               nsIXPCScriptable::ALLOW_PROP_MODS_DURING_RESOLVE
+#include "xpc_map_end.h" /* This will #undef the above */
+
+NS_IMETHODIMP
+nsXPCComponents_Results::NewEnumerate(nsIXPConnectWrappedNative* wrapper,
+                                      JSContext* cx, JSObject* obj,
+                                      JS::AutoIdVector& properties,
+                                      bool* _retval)
+{
+    const char* name;
+    const void* iter = nullptr;
+    while (nsXPCException::IterateNSResults(nullptr, &name, nullptr, &iter)) {
+        RootedString idstr(cx, JS_NewStringCopyZ(cx, name));
+        if (!idstr) {
+            *_retval = false;
+            return NS_OK;
+        }
+
+        RootedId id(cx);
+        if (!JS_StringToId(cx, idstr, &id)) {
+            *_retval = false;
+            return NS_OK;
+        }
+
+        if (!properties.append(id)) {
+            *_retval = false;
+            return NS_OK;
+        }
+    }
+
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsXPCComponents_Results::Resolve(nsIXPConnectWrappedNative* wrapper,
+                                 JSContext* cx, JSObject* objArg,
+                                 jsid idArg, bool* resolvedp,
+                                 bool* _retval)
+{
+    RootedObject obj(cx, objArg);
+    RootedId id(cx, idArg);
+    JSAutoByteString name;
+
+    if (JSID_IS_STRING(id) && name.encodeLatin1(cx, JSID_TO_STRING(id))) {
+        const char* rv_name;
+        const void* iter = nullptr;
+        nsresult rv;
+        while (nsXPCException::IterateNSResults(&rv, &rv_name, nullptr, &iter)) {
+            if (!strcmp(name.ptr(), rv_name)) {
+                *resolvedp = true;
+                if (!JS_DefinePropertyById(cx, obj, id, (uint32_t)rv,
+                                           JSPROP_ENUMERATE |
+                                           JSPROP_READONLY |
+                                           JSPROP_PERMANENT |
+                                           JSPROP_RESOLVING)) {
+                    return NS_ERROR_UNEXPECTED;
+                }
+            }
+        }
+    }
+    return NS_OK;
+}
+
+/***************************************************************************/
+// JavaScript Constructor for nsIJSID objects (Components.ID)
+
+class nsXPCComponents_ID final :
+  public nsIXPCComponents_ID,
+  public nsIXPCScriptable,
+  public nsIClassInfo
+{
+public:
+    // all the interface method declarations...
+    NS_DECL_ISUPPORTS
+    NS_DECL_NSIXPCCOMPONENTS_ID
+    NS_DECL_NSIXPCSCRIPTABLE
+    NS_DECL_NSICLASSINFO
+
+
+public:
+    nsXPCComponents_ID();
+
+private:
+    virtual ~nsXPCComponents_ID();
+    static nsresult CallOrConstruct(nsIXPConnectWrappedNative* wrapper,
+                                    JSContext* cx, HandleObject obj,
+                                    const CallArgs& args, bool* _retval);
+};
+
+/***************************************************************************/
+NS_IMETHODIMP
+nsXPCComponents_ID::GetInterfaces(uint32_t* aCount, nsIID * **aArray)
+{
+    const uint32_t count = 2;
+    *aCount = count;
+    nsIID** array;
+    *aArray = array = static_cast<nsIID**>(moz_xmalloc(count * sizeof(nsIID*)));
+    if (!array)
+        return NS_ERROR_OUT_OF_MEMORY;
+
+    uint32_t index = 0;
+    nsIID* clone;
+#define PUSH_IID(id)                                                          \
+    clone = static_cast<nsIID*>(nsMemory::Clone(&NS_GET_IID( id ),           \
+                                                 sizeof(nsIID)));             \
+    if (!clone)                                                               \
+        goto oom;                                                             \
+    array[index++] = clone;
+
+    PUSH_IID(nsIXPCComponents_ID)
+    PUSH_IID(nsIXPCScriptable)
+#undef PUSH_IID
+
+    return NS_OK;
+oom:
+    while (index)
+        free(array[--index]);
+    free(array);
+    *aArray = nullptr;
+    return NS_ERROR_OUT_OF_MEMORY;
+}
+
+NS_IMETHODIMP
+nsXPCComponents_ID::GetScriptableHelper(nsIXPCScriptable** retval)
+{
+    *retval = nullptr;
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsXPCComponents_ID::GetContractID(char * *aContractID)
+{
+    *aContractID = nullptr;
+    return NS_ERROR_NOT_AVAILABLE;
+}
+
+NS_IMETHODIMP
+nsXPCComponents_ID::GetClassDescription(char * *aClassDescription)
+{
+    static const char classDescription[] = "XPCComponents_ID";
+    *aClassDescription = (char*)nsMemory::Clone(classDescription, sizeof(classDescription));
+    return *aClassDescription ? NS_OK : NS_ERROR_OUT_OF_MEMORY;
+}
+
+NS_IMETHODIMP
+nsXPCComponents_ID::GetClassID(nsCID * *aClassID)
+{
+    *aClassID = nullptr;
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsXPCComponents_ID::GetFlags(uint32_t* aFlags)
+{
+    *aFlags = 0;
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsXPCComponents_ID::GetClassIDNoAlloc(nsCID* aClassIDNoAlloc)
+{
+    return NS_ERROR_NOT_AVAILABLE;
+}
+
+nsXPCComponents_ID::nsXPCComponents_ID()
+{
+}
+
+nsXPCComponents_ID::~nsXPCComponents_ID()
+{
+    // empty
+}
+
+NS_INTERFACE_MAP_BEGIN(nsXPCComponents_ID)
+  NS_INTERFACE_MAP_ENTRY(nsIXPCComponents_ID)
+  NS_INTERFACE_MAP_ENTRY(nsIXPCScriptable)
+  NS_INTERFACE_MAP_ENTRY(nsIClassInfo)
+  NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIXPCComponents_ID)
+NS_INTERFACE_MAP_END
+
+NS_IMPL_ADDREF(nsXPCComponents_ID)
+NS_IMPL_RELEASE(nsXPCComponents_ID)
+
+// The nsIXPCScriptable map declaration that will generate stubs for us...
+#define XPC_MAP_CLASSNAME           nsXPCComponents_ID
+#define XPC_MAP_QUOTED_CLASSNAME   "nsXPCComponents_ID"
+#define                             XPC_MAP_WANT_CALL
+#define                             XPC_MAP_WANT_CONSTRUCT
+#define                             XPC_MAP_WANT_HASINSTANCE
+#define XPC_MAP_FLAGS               nsIXPCScriptable::ALLOW_PROP_MODS_DURING_RESOLVE
+#include "xpc_map_end.h" /* This will #undef the above */
+
+
+NS_IMETHODIMP
+nsXPCComponents_ID::Call(nsIXPConnectWrappedNative* wrapper, JSContext* cx, JSObject* objArg,
+                         const CallArgs& args, bool* _retval)
+{
+    RootedObject obj(cx, objArg);
+    return CallOrConstruct(wrapper, cx, obj, args, _retval);
+}
+
+NS_IMETHODIMP
+nsXPCComponents_ID::Construct(nsIXPConnectWrappedNative* wrapper, JSContext* cx, JSObject* objArg,
+                              const CallArgs& args, bool* _retval)
+{
+    RootedObject obj(cx, objArg);
+    return CallOrConstruct(wrapper, cx, obj, args, _retval);
+}
+
+// static
+nsresult
+nsXPCComponents_ID::CallOrConstruct(nsIXPConnectWrappedNative* wrapper,
+                                    JSContext* cx, HandleObject obj,
+                                    const CallArgs& args, bool* _retval)
+{
+    // make sure we have at least one arg
+
+    if (args.length() < 1)
+        return ThrowAndFail(NS_ERROR_XPC_NOT_ENOUGH_ARGS, cx, _retval);
+
+    // Do the security check if necessary
+
+    if (NS_FAILED(nsXPConnect::SecurityManager()->CanCreateInstance(cx, nsJSID::GetCID()))) {
+        // the security manager vetoed. It should have set an exception.
+        *_retval = false;
+        return NS_OK;
+    }
+
+    // convert the first argument into a string and see if it looks like an id
+
+    JSString* jsstr;
+    JSAutoByteString bytes;
+    nsID id;
+
+    if (!(jsstr = ToString(cx, args[0])) ||
+        !bytes.encodeLatin1(cx, jsstr) ||
+        !id.Parse(bytes.ptr())) {
+        return ThrowAndFail(NS_ERROR_XPC_BAD_ID_STRING, cx, _retval);
+    }
+
+    // make the new object and return it.
+
+    JSObject* newobj = xpc_NewIDObject(cx, obj, id);
+    if (!newobj)
+        return NS_ERROR_UNEXPECTED;
+
+    args.rval().setObject(*newobj);
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsXPCComponents_ID::HasInstance(nsIXPConnectWrappedNative* wrapper,
+                                JSContext* cx, JSObject* obj,
+                                HandleValue val, bool* bp, bool* _retval)
+{
+    if (bp)
+        *bp = JSValIsInterfaceOfType(cx, val, NS_GET_IID(nsIJSID));
+    return NS_OK;
+}
+
+/***************************************************************************/
+// JavaScript Constructor for nsIXPCException objects (Components.Exception)
+
+class nsXPCComponents_Exception final :
+  public nsIXPCComponents_Exception,
+  public nsIXPCScriptable,
+  public nsIClassInfo
+{
+public:
+    // all the interface method declarations...
+    NS_DECL_ISUPPORTS
+    NS_DECL_NSIXPCCOMPONENTS_EXCEPTION
+    NS_DECL_NSIXPCSCRIPTABLE
+    NS_DECL_NSICLASSINFO
+
+
+public:
+    nsXPCComponents_Exception();
+
+private:
+    virtual ~nsXPCComponents_Exception();
+    static nsresult CallOrConstruct(nsIXPConnectWrappedNative* wrapper,
+                                    JSContext* cx, HandleObject obj,
+                                    const CallArgs& args, bool* _retval);
+};
+
+/***************************************************************************/
+NS_IMETHODIMP
+nsXPCComponents_Exception::GetInterfaces(uint32_t* aCount, nsIID * **aArray)
+{
+    const uint32_t count = 2;
+    *aCount = count;
+    nsIID** array;
+    *aArray = array = static_cast<nsIID**>(moz_xmalloc(count * sizeof(nsIID*)));
+    if (!array)
+        return NS_ERROR_OUT_OF_MEMORY;
+
+    uint32_t index = 0;
+    nsIID* clone;
+#define PUSH_IID(id)                                                          \
+    clone = static_cast<nsIID*>(nsMemory::Clone(&NS_GET_IID( id ),           \
+                                                 sizeof(nsIID)));             \
+    if (!clone)                                                               \
+        goto oom;                                                             \
+    array[index++] = clone;
+
+    PUSH_IID(nsIXPCComponents_Exception)
+    PUSH_IID(nsIXPCScriptable)
+#undef PUSH_IID
+
+    return NS_OK;
+oom:
+    while (index)
+        free(array[--index]);
+    free(array);
+    *aArray = nullptr;
+    return NS_ERROR_OUT_OF_MEMORY;
+}
+
+NS_IMETHODIMP
+nsXPCComponents_Exception::GetScriptableHelper(nsIXPCScriptable** retval)
+{
+    *retval = nullptr;
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsXPCComponents_Exception::GetContractID(char * *aContractID)
+{
+    *aContractID = nullptr;
+    return NS_ERROR_NOT_AVAILABLE;
+}
+
+NS_IMETHODIMP
+nsXPCComponents_Exception::GetClassDescription(char * *aClassDescription)
+{
+    static const char classDescription[] = "XPCComponents_Exception";
+    *aClassDescription = (char*)nsMemory::Clone(classDescription, sizeof(classDescription));
+    return *aClassDescription ? NS_OK : NS_ERROR_OUT_OF_MEMORY;
+}
+
+NS_IMETHODIMP
+nsXPCComponents_Exception::GetClassID(nsCID * *aClassID)
+{
+    *aClassID = nullptr;
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsXPCComponents_Exception::GetFlags(uint32_t* aFlags)
+{
+    *aFlags = 0;
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsXPCComponents_Exception::GetClassIDNoAlloc(nsCID* aClassIDNoAlloc)
+{
+    return NS_ERROR_NOT_AVAILABLE;
+}
+
+nsXPCComponents_Exception::nsXPCComponents_Exception()
+{
+}
+
+nsXPCComponents_Exception::~nsXPCComponents_Exception()
+{
+    // empty
+}
+
+NS_INTERFACE_MAP_BEGIN(nsXPCComponents_Exception)
+  NS_INTERFACE_MAP_ENTRY(nsIXPCComponents_Exception)
+  NS_INTERFACE_MAP_ENTRY(nsIXPCScriptable)
+  NS_INTERFACE_MAP_ENTRY(nsIClassInfo)
+  NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIXPCComponents_Exception)
+NS_INTERFACE_MAP_END
+
+NS_IMPL_ADDREF(nsXPCComponents_Exception)
+NS_IMPL_RELEASE(nsXPCComponents_Exception)
+
+// The nsIXPCScriptable map declaration that will generate stubs for us...
+#define XPC_MAP_CLASSNAME           nsXPCComponents_Exception
+#define XPC_MAP_QUOTED_CLASSNAME   "nsXPCComponents_Exception"
+#define                             XPC_MAP_WANT_CALL
+#define                             XPC_MAP_WANT_CONSTRUCT
+#define                             XPC_MAP_WANT_HASINSTANCE
+#define XPC_MAP_FLAGS               nsIXPCScriptable::ALLOW_PROP_MODS_DURING_RESOLVE
+#include "xpc_map_end.h" /* This will #undef the above */
+
+
+NS_IMETHODIMP
+nsXPCComponents_Exception::Call(nsIXPConnectWrappedNative* wrapper, JSContext* cx, JSObject* objArg,
+                                const CallArgs& args, bool* _retval)
+{
+    RootedObject obj(cx, objArg);
+    return CallOrConstruct(wrapper, cx, obj, args, _retval);
+}
+
+NS_IMETHODIMP
+nsXPCComponents_Exception::Construct(nsIXPConnectWrappedNative* wrapper, JSContext* cx,
+                                     JSObject* objArg, const CallArgs& args, bool* _retval)
+{
+    RootedObject obj(cx, objArg);
+    return CallOrConstruct(wrapper, cx, obj, args, _retval);
+}
+
+struct MOZ_STACK_CLASS ExceptionArgParser
+{
+    ExceptionArgParser(JSContext* context,
+                       nsXPConnect* xpconnect)
+        : eMsg("exception")
+        , eResult(NS_ERROR_FAILURE)
+        , cx(context)
+        , xpc(xpconnect)
+    {}
+
+    // Public exception parameter values. During construction, these are
+    // initialized to the appropriate defaults.
+    const char*             eMsg;
+    nsresult                eResult;
+    nsCOMPtr<nsIStackFrame> eStack;
+    nsCOMPtr<nsISupports>   eData;
+
+    // Parse the constructor arguments into the above |eFoo| parameter values.
+    bool parse(const CallArgs& args) {
+        /*
+         * The Components.Exception takes a series of arguments, all of them
+         * optional:
+         *
+         * Argument 0: Exception message (defaults to 'exception').
+         * Argument 1: Result code (defaults to NS_ERROR_FAILURE) _or_ options
+         *             object (see below).
+         * Argument 2: Stack (defaults to the current stack, which we trigger
+         *                    by leaving this nullptr in the parser).
+         * Argument 3: Optional user data (defaults to nullptr).
+         *
+         * To dig our way out of this clunky API, we now support passing an
+         * options object as the second parameter (as opposed to a result code).
+         * If this is the case, all subsequent arguments are ignored, and the
+         * following properties are parsed out of the object (using the
+         * associated default if the property does not exist):
+         *
+         *   result:    Result code (see argument 1).
+         *   stack:     Call stack (see argument 2).
+         *   data:      User data (see argument 3).
+         */
+        if (args.length() > 0 && !parseMessage(args[0]))
+            return false;
+        if (args.length() > 1) {
+            if (args[1].isObject()) {
+                RootedObject obj(cx, &args[1].toObject());
+                return parseOptionsObject(obj);
+            }
+            if (!parseResult(args[1]))
+                return false;
+        }
+        if (args.length() > 2) {
+            if (!parseStack(args[2]))
+                return false;
+        }
+        if (args.length() > 3) {
+            if (!parseData(args[3]))
+                return false;
+        }
+        return true;
+    }
+
+  protected:
+
+    /*
+     * Parsing helpers.
+     */
+
+    bool parseMessage(HandleValue v) {
+        JSString* str = ToString(cx, v);
+        if (!str)
+           return false;
+        eMsg = messageBytes.encodeLatin1(cx, str);
+        return !!eMsg;
+    }
+
+    bool parseResult(HandleValue v) {
+        return JS::ToUint32(cx, v, (uint32_t*) &eResult);
+    }
+
+    bool parseStack(HandleValue v) {
+        if (!v.isObject()) {
+            // eStack has already been initialized to null, which is what we want
+            // for any non-object values (including null).
+            return true;
+        }
+
+        return NS_SUCCEEDED(xpc->WrapJS(cx, &v.toObject(),
+                                        NS_GET_IID(nsIStackFrame),
+                                        getter_AddRefs(eStack)));
+    }
+
+    bool parseData(HandleValue v) {
+        if (!v.isObject()) {
+            // eData has already been initialized to null, which is what we want
+            // for any non-object values (including null).
+            return true;
+        }
+
+        return NS_SUCCEEDED(xpc->WrapJS(cx, &v.toObject(),
+                                        NS_GET_IID(nsISupports),
+                                        getter_AddRefs(eData)));
+    }
+
+    bool parseOptionsObject(HandleObject obj) {
+        RootedValue v(cx);
+
+        if (!getOption(obj, "result", &v) ||
+            (!v.isUndefined() && !parseResult(v)))
+            return false;
+
+        if (!getOption(obj, "stack", &v) ||
+            (!v.isUndefined() && !parseStack(v)))
+            return false;
+
+        if (!getOption(obj, "data", &v) ||
+            (!v.isUndefined() && !parseData(v)))
+            return false;
+
+        return true;
+    }
+
+    bool getOption(HandleObject obj, const char* name, MutableHandleValue rv) {
+        // Look for the property.
+        bool found;
+        if (!JS_HasProperty(cx, obj, name, &found))
+            return false;
+
+        // If it wasn't found, indicate with undefined.
+        if (!found) {
+            rv.setUndefined();
+            return true;
+        }
+
+        // Get the property.
+        return JS_GetProperty(cx, obj, name, rv);
+    }
+
+    /*
+     * Internal data members.
+     */
+
+    // If there's a non-default exception string, hold onto the allocated bytes.
+    JSAutoByteString messageBytes;
+
+    // Various bits and pieces that are helpful to have around.
+    JSContext* cx;
+    nsXPConnect* xpc;
+};
+
+// static
+nsresult
+nsXPCComponents_Exception::CallOrConstruct(nsIXPConnectWrappedNative* wrapper,
+                                           JSContext* cx, HandleObject obj,
+                                           const CallArgs& args, bool* _retval)
+{
+    nsXPConnect* xpc = nsXPConnect::XPConnect();
+
+    // Do the security check if necessary
+
+    if (NS_FAILED(nsXPConnect::SecurityManager()->CanCreateInstance(cx, Exception::GetCID()))) {
+        // the security manager vetoed. It should have set an exception.
+        *_retval = false;
+        return NS_OK;
+    }
+
+    // Parse the arguments to the Exception constructor.
+    ExceptionArgParser parser(cx, xpc);
+    if (!parser.parse(args))
+        return ThrowAndFail(NS_ERROR_XPC_BAD_CONVERT_JS, cx, _retval);
+
+    nsCOMPtr<nsIException> e = new Exception(nsCString(parser.eMsg),
+                                             parser.eResult,
+                                             EmptyCString(),
+                                             parser.eStack,
+                                             parser.eData);
+
+    RootedObject newObj(cx);
+    if (NS_FAILED(xpc->WrapNative(cx, obj, e, NS_GET_IID(nsIXPCException), newObj.address())) || !newObj) {
+        return ThrowAndFail(NS_ERROR_XPC_CANT_CREATE_WN, cx, _retval);
+    }
+
+    args.rval().setObject(*newObj);
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsXPCComponents_Exception::HasInstance(nsIXPConnectWrappedNative* wrapper,
+                                       JSContext * cx, JSObject * obj,
+                                       HandleValue val, bool* bp,
+                                       bool* _retval)
+{
+    using namespace mozilla::dom;
+
+    if (bp) {
+        *bp = (val.isObject() &&
+               IS_INSTANCE_OF(Exception, &val.toObject())) ||
+              JSValIsInterfaceOfType(cx, val, NS_GET_IID(nsIException));
+    }
+    return NS_OK;
+}
+
+/***************************************************************************/
+// This class is for the thing returned by "new Component.Constructor".
+
+// XXXjband we use this CID for security check, but security system can't see
+// it since it has no registed factory. Security really kicks in when we try
+// to build a wrapper around an instance.
+
+// {B4A95150-E25A-11d3-8F61-0010A4E73D9A}
+#define NS_XPCCONSTRUCTOR_CID                                                 \
+{ 0xb4a95150, 0xe25a, 0x11d3,                                                 \
+    { 0x8f, 0x61, 0x0, 0x10, 0xa4, 0xe7, 0x3d, 0x9a } }
+
+class nsXPCConstructor :
+  public nsIXPCConstructor,
+  public nsIXPCScriptable,
+  public nsIClassInfo
+{
+public:
+    NS_DEFINE_STATIC_CID_ACCESSOR(NS_XPCCONSTRUCTOR_CID)
+public:
+    // all the interface method declarations...
+    NS_DECL_ISUPPORTS
+    NS_DECL_NSIXPCCONSTRUCTOR
+    NS_DECL_NSIXPCSCRIPTABLE
+    NS_DECL_NSICLASSINFO
+
+public:
+    nsXPCConstructor() = delete;
+    nsXPCConstructor(nsIJSCID* aClassID,
+                     nsIJSIID* aInterfaceID,
+                     const char* aInitializer);
+
+private:
+    virtual ~nsXPCConstructor();
+    nsresult CallOrConstruct(nsIXPConnectWrappedNative* wrapper,
+                             JSContext* cx, HandleObject obj,
+                             const CallArgs& args, bool* _retval);
+private:
+    RefPtr<nsIJSCID> mClassID;
+    RefPtr<nsIJSIID> mInterfaceID;
+    char*              mInitializer;
+};
+
+/***************************************************************************/
+NS_IMETHODIMP
+nsXPCConstructor::GetInterfaces(uint32_t* aCount, nsIID * **aArray)
+{
+    const uint32_t count = 2;
+    *aCount = count;
+    nsIID** array;
+    *aArray = array = static_cast<nsIID**>(moz_xmalloc(count * sizeof(nsIID*)));
+    if (!array)
+        return NS_ERROR_OUT_OF_MEMORY;
+
+    uint32_t index = 0;
+    nsIID* clone;
+#define PUSH_IID(id)                                                          \
+    clone = static_cast<nsIID*>(nsMemory::Clone(&NS_GET_IID( id ),           \
+                                                 sizeof(nsIID)));             \
+    if (!clone)                                                               \
+        goto oom;                                                             \
+    array[index++] = clone;
+
+    PUSH_IID(nsIXPCConstructor)
+    PUSH_IID(nsIXPCScriptable)
+#undef PUSH_IID
+
+    return NS_OK;
+oom:
+    while (index)
+        free(array[--index]);
+    free(array);
+    *aArray = nullptr;
+    return NS_ERROR_OUT_OF_MEMORY;
+}
+
+NS_IMETHODIMP
+nsXPCConstructor::GetScriptableHelper(nsIXPCScriptable** retval)
+{
+    *retval = nullptr;
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsXPCConstructor::GetContractID(char * *aContractID)
+{
+    *aContractID = nullptr;
+    return NS_ERROR_NOT_AVAILABLE;
+}
+
+NS_IMETHODIMP
+nsXPCConstructor::GetClassDescription(char * *aClassDescription)
+{
+    static const char classDescription[] = "XPCConstructor";
+    *aClassDescription = (char*)nsMemory::Clone(classDescription, sizeof(classDescription));
+    return *aClassDescription ? NS_OK : NS_ERROR_OUT_OF_MEMORY;
+}
+
+NS_IMETHODIMP
+nsXPCConstructor::GetClassID(nsCID * *aClassID)
+{
+    *aClassID = nullptr;
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsXPCConstructor::GetFlags(uint32_t* aFlags)
+{
+    *aFlags = 0;
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsXPCConstructor::GetClassIDNoAlloc(nsCID* aClassIDNoAlloc)
+{
+    return NS_ERROR_NOT_AVAILABLE;
+}
+
+nsXPCConstructor::nsXPCConstructor(nsIJSCID* aClassID,
+                                   nsIJSIID* aInterfaceID,
+                                   const char* aInitializer)
+    : mClassID(aClassID),
+      mInterfaceID(aInterfaceID)
+{
+    mInitializer = aInitializer ?
+        (char*) nsMemory::Clone(aInitializer, strlen(aInitializer)+1) :
+        nullptr;
+}
+
+nsXPCConstructor::~nsXPCConstructor()
+{
+    if (mInitializer)
+        free(mInitializer);
+}
+
+NS_IMETHODIMP
+nsXPCConstructor::GetClassID(nsIJSCID * *aClassID)
+{
+    RefPtr<nsIJSCID> rval = mClassID;
+    rval.forget(aClassID);
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsXPCConstructor::GetInterfaceID(nsIJSIID * *aInterfaceID)
+{
+    RefPtr<nsIJSIID> rval = mInterfaceID;
+    rval.forget(aInterfaceID);
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsXPCConstructor::GetInitializer(char * *aInitializer)
+{
+    XPC_STRING_GETTER_BODY(aInitializer, mInitializer);
+}
+
+NS_INTERFACE_MAP_BEGIN(nsXPCConstructor)
+  NS_INTERFACE_MAP_ENTRY(nsIXPCConstructor)
+  NS_INTERFACE_MAP_ENTRY(nsIXPCScriptable)
+  NS_INTERFACE_MAP_ENTRY(nsIClassInfo)
+  NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIXPCConstructor)
+NS_INTERFACE_MAP_END
+
+NS_IMPL_ADDREF(nsXPCConstructor)
+NS_IMPL_RELEASE(nsXPCConstructor)
+
+// The nsIXPCScriptable map declaration that will generate stubs for us...
+#define XPC_MAP_CLASSNAME           nsXPCConstructor
+#define XPC_MAP_QUOTED_CLASSNAME   "nsXPCConstructor"
+#define                             XPC_MAP_WANT_CALL
+#define                             XPC_MAP_WANT_CONSTRUCT
+#define XPC_MAP_FLAGS               0
+#include "xpc_map_end.h" /* This will #undef the above */
+
+
+NS_IMETHODIMP
+nsXPCConstructor::Call(nsIXPConnectWrappedNative* wrapper, JSContext* cx, JSObject* objArg,
+                       const CallArgs& args, bool* _retval)
+{
+    RootedObject obj(cx, objArg);
+    return CallOrConstruct(wrapper, cx, obj, args, _retval);
+
+}
+
+NS_IMETHODIMP
+nsXPCConstructor::Construct(nsIXPConnectWrappedNative* wrapper, JSContext* cx, JSObject* objArg,
+                            const CallArgs& args, bool* _retval)
+{
+    RootedObject obj(cx, objArg);
+    return CallOrConstruct(wrapper, cx, obj, args, _retval);
+}
+
+// static
+nsresult
+nsXPCConstructor::CallOrConstruct(nsIXPConnectWrappedNative* wrapper,JSContext* cx,
+                                  HandleObject obj, const CallArgs& args, bool* _retval)
+{
+    nsXPConnect* xpc = nsXPConnect::XPConnect();
+
+    // security check not required because we are going to call through the
+    // code which is reflected into JS which will do that for us later.
+
+    RootedObject cidObj(cx);
+    RootedObject iidObj(cx);
+
+    if (NS_FAILED(xpc->WrapNative(cx, obj, mClassID, NS_GET_IID(nsIJSCID), cidObj.address())) || !cidObj ||
+        NS_FAILED(xpc->WrapNative(cx, obj, mInterfaceID, NS_GET_IID(nsIJSIID), iidObj.address())) || !iidObj) {
+        return ThrowAndFail(NS_ERROR_XPC_CANT_CREATE_WN, cx, _retval);
+    }
+
+    JS::Rooted<JS::Value> arg(cx, ObjectValue(*iidObj));
+    RootedValue rval(cx);
+    if (!JS_CallFunctionName(cx, cidObj, "createInstance", JS::HandleValueArray(arg), &rval) ||
+        rval.isPrimitive()) {
+        // createInstance will have thrown an exception
+        *_retval = false;
+        return NS_OK;
+    }
+
+    args.rval().set(rval);
+
+    // call initializer method if supplied
+    if (mInitializer) {
+        RootedObject newObj(cx, &rval.toObject());
+        // first check existence of function property for better error reporting
+        RootedValue fun(cx);
+        if (!JS_GetProperty(cx, newObj, mInitializer, &fun) ||
+            fun.isPrimitive()) {
+            return ThrowAndFail(NS_ERROR_XPC_BAD_INITIALIZER_NAME, cx, _retval);
+        }
+
+        RootedValue dummy(cx);
+        if (!JS_CallFunctionValue(cx, newObj, fun, args, &dummy)) {
+            // function should have thrown an exception
+            *_retval = false;
+            return NS_OK;
+        }
+    }
+
+    return NS_OK;
+}
+
+/*******************************************************/
+// JavaScript Constructor for nsIXPCConstructor objects (Components.Constructor)
+
+class nsXPCComponents_Constructor final :
+  public nsIXPCComponents_Constructor,
+  public nsIXPCScriptable,
+  public nsIClassInfo
+{
+public:
+    // all the interface method declarations...
+    NS_DECL_ISUPPORTS
+    NS_DECL_NSIXPCCOMPONENTS_CONSTRUCTOR
+    NS_DECL_NSIXPCSCRIPTABLE
+    NS_DECL_NSICLASSINFO
+
+public:
+    nsXPCComponents_Constructor();
+
+private:
+    virtual ~nsXPCComponents_Constructor();
+    static nsresult CallOrConstruct(nsIXPConnectWrappedNative* wrapper,
+                                    JSContext* cx, HandleObject obj,
+                                    const CallArgs& args, bool* _retval);
+};
+
+/***************************************************************************/
+NS_IMETHODIMP
+nsXPCComponents_Constructor::GetInterfaces(uint32_t* aCount, nsIID * **aArray)
+{
+    const uint32_t count = 2;
+    *aCount = count;
+    nsIID** array;
+    *aArray = array = static_cast<nsIID**>(moz_xmalloc(count * sizeof(nsIID*)));
+    if (!array)
+        return NS_ERROR_OUT_OF_MEMORY;
+
+    uint32_t index = 0;
+    nsIID* clone;
+#define PUSH_IID(id)                                                          \
+    clone = static_cast<nsIID*>(nsMemory::Clone(&NS_GET_IID( id ),           \
+                                                 sizeof(nsIID)));             \
+    if (!clone)                                                               \
+        goto oom;                                                             \
+    array[index++] = clone;
+
+    PUSH_IID(nsIXPCComponents_Constructor)
+    PUSH_IID(nsIXPCScriptable)
+#undef PUSH_IID
+
+    return NS_OK;
+oom:
+    while (index)
+        free(array[--index]);
+    free(array);
+    *aArray = nullptr;
+    return NS_ERROR_OUT_OF_MEMORY;
+}
+
+NS_IMETHODIMP
+nsXPCComponents_Constructor::GetScriptableHelper(nsIXPCScriptable** retval)
+{
+    *retval = nullptr;
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsXPCComponents_Constructor::GetContractID(char * *aContractID)
+{
+    *aContractID = nullptr;
+    return NS_ERROR_NOT_AVAILABLE;
+}
+
+NS_IMETHODIMP
+nsXPCComponents_Constructor::GetClassDescription(char * *aClassDescription)
+{
+    static const char classDescription[] = "XPCComponents_Constructor";
+    *aClassDescription = (char*)nsMemory::Clone(classDescription, sizeof(classDescription));
+    return *aClassDescription ? NS_OK : NS_ERROR_OUT_OF_MEMORY;
+}
+
+NS_IMETHODIMP
+nsXPCComponents_Constructor::GetClassID(nsCID * *aClassID)
+{
+    *aClassID = nullptr;
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsXPCComponents_Constructor::GetFlags(uint32_t* aFlags)
+{
+    *aFlags = 0;
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsXPCComponents_Constructor::GetClassIDNoAlloc(nsCID* aClassIDNoAlloc)
+{
+    return NS_ERROR_NOT_AVAILABLE;
+}
+
+nsXPCComponents_Constructor::nsXPCComponents_Constructor()
+{
+}
+
+nsXPCComponents_Constructor::~nsXPCComponents_Constructor()
+{
+    // empty
+}
+
+NS_INTERFACE_MAP_BEGIN(nsXPCComponents_Constructor)
+  NS_INTERFACE_MAP_ENTRY(nsIXPCComponents_Constructor)
+  NS_INTERFACE_MAP_ENTRY(nsIXPCScriptable)
+  NS_INTERFACE_MAP_ENTRY(nsIClassInfo)
+  NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIXPCComponents_Constructor)
+NS_INTERFACE_MAP_END
+
+NS_IMPL_ADDREF(nsXPCComponents_Constructor)
+NS_IMPL_RELEASE(nsXPCComponents_Constructor)
+
+// The nsIXPCScriptable map declaration that will generate stubs for us...
+#define XPC_MAP_CLASSNAME           nsXPCComponents_Constructor
+#define XPC_MAP_QUOTED_CLASSNAME   "nsXPCComponents_Constructor"
+#define                             XPC_MAP_WANT_CALL
+#define                             XPC_MAP_WANT_CONSTRUCT
+#define                             XPC_MAP_WANT_HASINSTANCE
+#define XPC_MAP_FLAGS               nsIXPCScriptable::ALLOW_PROP_MODS_DURING_RESOLVE
+#include "xpc_map_end.h" /* This will #undef the above */
+
+
+NS_IMETHODIMP
+nsXPCComponents_Constructor::Call(nsIXPConnectWrappedNative* wrapper, JSContext* cx,
+                                  JSObject* objArg, const CallArgs& args, bool* _retval)
+{
+    RootedObject obj(cx, objArg);
+    return CallOrConstruct(wrapper, cx, obj, args, _retval);
+}
+
+NS_IMETHODIMP
+nsXPCComponents_Constructor::Construct(nsIXPConnectWrappedNative* wrapper, JSContext* cx,
+                                       JSObject* objArg, const CallArgs& args, bool* _retval)
+{
+    RootedObject obj(cx, objArg);
+    return CallOrConstruct(wrapper, cx, obj, args, _retval);
+}
+
+// static
+nsresult
+nsXPCComponents_Constructor::CallOrConstruct(nsIXPConnectWrappedNative* wrapper,
+                                             JSContext* cx, HandleObject obj,
+                                             const CallArgs& args, bool* _retval)
+{
+    // make sure we have at least one arg
+
+    if (args.length() < 1)
+        return ThrowAndFail(NS_ERROR_XPC_NOT_ENOUGH_ARGS, cx, _retval);
+
+    // get the various other object pointers we need
+
+    nsXPConnect* xpc = nsXPConnect::XPConnect();
+    XPCWrappedNativeScope* scope = ObjectScope(obj);
+    nsCOMPtr<nsIXPCComponents> comp;
+
+    if (!xpc || !scope || !(comp = do_QueryInterface(scope->GetComponents())))
+        return ThrowAndFail(NS_ERROR_XPC_UNEXPECTED, cx, _retval);
+
+    // Do the security check if necessary
+
+    if (NS_FAILED(nsXPConnect::SecurityManager()->CanCreateInstance(cx, nsXPCConstructor::GetCID()))) {
+        // the security manager vetoed. It should have set an exception.
+        *_retval = false;
+        return NS_OK;
+    }
+
+    // initialization params for the Constructor object we will create
+    nsCOMPtr<nsIJSCID> cClassID;
+    nsCOMPtr<nsIJSIID> cInterfaceID;
+    const char*        cInitializer = nullptr;
+    JSAutoByteString  cInitializerBytes;
+
+    if (args.length() >= 3) {
+        // args[2] is an initializer function or property name
+        RootedString str(cx, ToString(cx, args[2]));
+        if (!str || !(cInitializer = cInitializerBytes.encodeLatin1(cx, str)))
+            return ThrowAndFail(NS_ERROR_XPC_BAD_CONVERT_JS, cx, _retval);
+    }
+
+    if (args.length() >= 2) {
+        // args[1] is an iid name string
+        // XXXjband support passing "Components.interfaces.foo"?
+
+        nsCOMPtr<nsIXPCComponents_Interfaces> ifaces;
+        RootedObject ifacesObj(cx);
+
+        // we do the lookup by asking the Components.interfaces object
+        // for the property with this name - i.e. we let its caching of these
+        // nsIJSIID objects work for us.
+
+        if (NS_FAILED(comp->GetInterfaces(getter_AddRefs(ifaces))) ||
+            NS_FAILED(xpc->WrapNative(cx, obj, ifaces,
+                                      NS_GET_IID(nsIXPCComponents_Interfaces),
+                                      ifacesObj.address())) || !ifacesObj) {
+            return ThrowAndFail(NS_ERROR_XPC_UNEXPECTED, cx, _retval);
+        }
+
+        RootedString str(cx, ToString(cx, args[1]));
+        RootedId id(cx);
+        if (!str || !JS_StringToId(cx, str, &id))
+            return ThrowAndFail(NS_ERROR_XPC_BAD_CONVERT_JS, cx, _retval);
+
+        RootedValue val(cx);
+        if (!JS_GetPropertyById(cx, ifacesObj, id, &val) || val.isPrimitive())
+            return ThrowAndFail(NS_ERROR_XPC_BAD_IID, cx, _retval);
+
+        nsCOMPtr<nsIXPConnectWrappedNative> wn;
+        if (NS_FAILED(xpc->GetWrappedNativeOfJSObject(cx, &val.toObject(),
+                                                      getter_AddRefs(wn))) || !wn ||
+            !(cInterfaceID = do_QueryWrappedNative(wn))) {
+            return ThrowAndFail(NS_ERROR_XPC_UNEXPECTED, cx, _retval);
+        }
+    } else {
+        nsCOMPtr<nsIInterfaceInfo> info;
+        xpc->GetInfoForIID(&NS_GET_IID(nsISupports), getter_AddRefs(info));
+
+        if (info) {
+            cInterfaceID = nsJSIID::NewID(info);
+        }
+        if (!cInterfaceID)
+            return ThrowAndFail(NS_ERROR_XPC_UNEXPECTED, cx, _retval);
+    }
+
+    // a new scope to avoid warnings about shadowed names
+    {
+        // argv[0] is a contractid name string
+        // XXXjband support passing "Components.classes.foo"?
+
+        // we do the lookup by asking the Components.classes object
+        // for the property with this name - i.e. we let its caching of these
+        // nsIJSCID objects work for us.
+
+        nsCOMPtr<nsIXPCComponents_Classes> classes;
+        RootedObject classesObj(cx);
+
+        if (NS_FAILED(comp->GetClasses(getter_AddRefs(classes))) ||
+            NS_FAILED(xpc->WrapNative(cx, obj, classes,
+                                      NS_GET_IID(nsIXPCComponents_Classes),
+                                      classesObj.address())) || !classesObj) {
+            return ThrowAndFail(NS_ERROR_XPC_UNEXPECTED, cx, _retval);
+        }
+
+        RootedString str(cx, ToString(cx, args[0]));
+        RootedId id(cx);
+        if (!str || !JS_StringToId(cx, str, &id))
+            return ThrowAndFail(NS_ERROR_XPC_BAD_CONVERT_JS, cx, _retval);
+
+        RootedValue val(cx);
+        if (!JS_GetPropertyById(cx, classesObj, id, &val) || val.isPrimitive())
+            return ThrowAndFail(NS_ERROR_XPC_BAD_CID, cx, _retval);
+
+        nsCOMPtr<nsIXPConnectWrappedNative> wn;
+        if (NS_FAILED(xpc->GetWrappedNativeOfJSObject(cx, val.toObjectOrNull(),
+                                                      getter_AddRefs(wn))) || !wn ||
+            !(cClassID = do_QueryWrappedNative(wn))) {
+            return ThrowAndFail(NS_ERROR_XPC_UNEXPECTED, cx, _retval);
+        }
+    }
+
+    nsCOMPtr<nsIXPCConstructor> ctor = new nsXPCConstructor(cClassID, cInterfaceID, cInitializer);
+    RootedObject newObj(cx);
+
+    if (NS_FAILED(xpc->WrapNative(cx, obj, ctor, NS_GET_IID(nsIXPCConstructor), newObj.address())) || !newObj) {
+        return ThrowAndFail(NS_ERROR_XPC_CANT_CREATE_WN, cx, _retval);
+    }
+
+    args.rval().setObject(*newObj);
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsXPCComponents_Constructor::HasInstance(nsIXPConnectWrappedNative* wrapper,
+                                         JSContext * cx, JSObject * obj,
+                                         HandleValue val, bool* bp,
+                                         bool* _retval)
+{
+    if (bp)
+        *bp = JSValIsInterfaceOfType(cx, val, NS_GET_IID(nsIXPCConstructor));
+    return NS_OK;
+}
+
+class nsXPCComponents_Utils final :
+            public nsIXPCComponents_Utils,
+            public nsIXPCScriptable
+{
+public:
+    // all the interface method declarations...
+    NS_DECL_ISUPPORTS
+    NS_DECL_NSIXPCSCRIPTABLE
+    NS_DECL_NSIXPCCOMPONENTS_UTILS
+
+public:
+    nsXPCComponents_Utils() { }
+
+private:
+    virtual ~nsXPCComponents_Utils() { }
+    nsCOMPtr<nsIXPCComponents_utils_Sandbox> mSandbox;
+};
+
+NS_INTERFACE_MAP_BEGIN(nsXPCComponents_Utils)
+  NS_INTERFACE_MAP_ENTRY(nsIXPCComponents_Utils)
+  NS_INTERFACE_MAP_ENTRY(nsIXPCScriptable)
+  NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIXPCComponents_Utils)
+NS_INTERFACE_MAP_END
+
+NS_IMPL_ADDREF(nsXPCComponents_Utils)
+NS_IMPL_RELEASE(nsXPCComponents_Utils)
+
+// The nsIXPCScriptable map declaration that will generate stubs for us...
+#define XPC_MAP_CLASSNAME           nsXPCComponents_Utils
+#define XPC_MAP_QUOTED_CLASSNAME   "nsXPCComponents_Utils"
+#define XPC_MAP_FLAGS               nsIXPCScriptable::ALLOW_PROP_MODS_DURING_RESOLVE
+#include "xpc_map_end.h" /* This will #undef the above */
+
+NS_IMETHODIMP
+nsXPCComponents_Utils::GetSandbox(nsIXPCComponents_utils_Sandbox** aSandbox)
+{
+    NS_ENSURE_ARG_POINTER(aSandbox);
+    if (!mSandbox)
+        mSandbox = NewSandboxConstructor();
+
+    nsCOMPtr<nsIXPCComponents_utils_Sandbox> rval = mSandbox;
+    rval.forget(aSandbox);
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsXPCComponents_Utils::ReportError(HandleValue error, JSContext* cx)
+{
+    // This function shall never fail! Silently eat any failure conditions.
+
+    nsCOMPtr<nsIConsoleService> console(do_GetService(NS_CONSOLESERVICE_CONTRACTID));
+    if (!console)
+        return NS_OK;
+
+    nsGlobalWindow* globalWin = CurrentWindowOrNull(cx);
+    nsPIDOMWindowInner* win = globalWin ? globalWin->AsInner() : nullptr;
+    const uint64_t innerWindowID = win ? win->WindowID() : 0;
+
+    RootedObject errorObj(cx, error.isObject() ? &error.toObject() : nullptr);
+    JSErrorReport* err = errorObj ? JS_ErrorFromException(cx, errorObj) : nullptr;
+
+    nsCOMPtr<nsIScriptError> scripterr;
+
+    if (errorObj) {
+        JS::RootedObject stackVal(cx,
+          FindExceptionStackForConsoleReport(win, error));
+        if (stackVal) {
+            scripterr = new nsScriptErrorWithStack(stackVal);
+        }
+    }
+
+    nsString fileName;
+    int32_t lineNo = 0;
+
+    if (!scripterr) {
+        nsCOMPtr<nsIStackFrame> frame = dom::GetCurrentJSStack();
+        if (frame) {
+            frame->GetFilename(cx, fileName);
+            frame->GetLineNumber(cx, &lineNo);
+            JS::Rooted<JS::Value> stack(cx);
+            nsresult rv = frame->GetNativeSavedFrame(&stack);
+            if (NS_SUCCEEDED(rv) && stack.isObject()) {
+              JS::Rooted<JSObject*> stackObj(cx, &stack.toObject());
+              scripterr = new nsScriptErrorWithStack(stackObj);
+            }
+        }
+    }
+
+    if (!scripterr) {
+        scripterr = new nsScriptError();
+    }
+
+    if (err) {
+        // It's a proper JS Error
+        nsAutoString fileUni;
+        CopyUTF8toUTF16(err->filename, fileUni);
+
+        uint32_t column = err->tokenOffset();
+
+        const char16_t* linebuf = err->linebuf();
+
+        nsresult rv = scripterr->InitWithWindowID(
+                err->message() ? NS_ConvertUTF8toUTF16(err->message().c_str())
+                : EmptyString(),
+                fileUni,
+                linebuf ? nsDependentString(linebuf, err->linebufLength()) : EmptyString(),
+                err->lineno,
+                column, err->flags, "XPConnect JavaScript", innerWindowID);
+        NS_ENSURE_SUCCESS(rv, NS_OK);
+
+        console->LogMessage(scripterr);
+        return NS_OK;
+    }
+
+    // It's not a JS Error object, so we synthesize as best we're able.
+    RootedString msgstr(cx, ToString(cx, error));
+    if (!msgstr)
+        return NS_OK;
+
+    nsAutoJSString msg;
+    if (!msg.init(cx, msgstr))
+        return NS_OK;
+
+    nsresult rv = scripterr->InitWithWindowID(
+            msg, fileName, EmptyString(), lineNo, 0, 0,
+            "XPConnect JavaScript", innerWindowID);
+    NS_ENSURE_SUCCESS(rv, NS_OK);
+
+    console->LogMessage(scripterr);
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsXPCComponents_Utils::EvalInSandbox(const nsAString& source,
+                                     HandleValue sandboxVal,
+                                     HandleValue version,
+                                     const nsACString& filenameArg,
+                                     int32_t lineNumber,
+                                     JSContext* cx,
+                                     uint8_t optionalArgc,
+                                     MutableHandleValue retval)
+{
+    RootedObject sandbox(cx);
+    if (!JS_ValueToObject(cx, sandboxVal, &sandbox) || !sandbox)
+        return NS_ERROR_INVALID_ARG;
+
+    // Optional third argument: JS version, as a string.
+    JSVersion jsVersion = JSVERSION_DEFAULT;
+    if (optionalArgc >= 1) {
+        JSString* jsVersionStr = ToString(cx, version);
+        if (!jsVersionStr)
+            return NS_ERROR_INVALID_ARG;
+
+        JSAutoByteString bytes(cx, jsVersionStr);
+        if (!bytes)
+            return NS_ERROR_INVALID_ARG;
+
+        jsVersion = JS_StringToVersion(bytes.ptr());
+        // Explicitly check for "latest", which we support for sandboxes but
+        // isn't in the set of web-exposed version strings.
+        if (jsVersion == JSVERSION_UNKNOWN &&
+            !strcmp(bytes.ptr(), "latest"))
+        {
+            jsVersion = JSVERSION_LATEST;
+        }
+        if (jsVersion == JSVERSION_UNKNOWN)
+            return NS_ERROR_INVALID_ARG;
+    }
+
+    // Optional fourth and fifth arguments: filename and line number.
+    int32_t lineNo = (optionalArgc >= 3) ? lineNumber : 1;
+    nsCString filename;
+    if (!filenameArg.IsVoid()) {
+        filename.Assign(filenameArg);
+    } else {
+        // Get the current source info from xpc.
+        nsresult rv;
+        nsCOMPtr<nsIXPConnect> xpc = do_GetService(nsIXPConnect::GetCID(), &rv);
+        NS_ENSURE_SUCCESS(rv, rv);
+
+        nsCOMPtr<nsIStackFrame> frame;
+        xpc->GetCurrentJSStack(getter_AddRefs(frame));
+        if (frame) {
+            nsString frameFile;
+            frame->GetFilename(cx, frameFile);
+            CopyUTF16toUTF8(frameFile, filename);
+            frame->GetLineNumber(cx, &lineNo);
+        }
+    }
+
+    return xpc::EvalInSandbox(cx, sandbox, source, filename, lineNo,
+                              jsVersion, retval);
+}
+
+NS_IMETHODIMP
+nsXPCComponents_Utils::GetSandboxAddonId(HandleValue sandboxVal,
+                                         JSContext* cx, MutableHandleValue rval)
+{
+    if (!sandboxVal.isObject())
+        return NS_ERROR_INVALID_ARG;
+
+    RootedObject sandbox(cx, &sandboxVal.toObject());
+    sandbox = js::CheckedUnwrap(sandbox);
+    if (!sandbox || !xpc::IsSandbox(sandbox))
+        return NS_ERROR_INVALID_ARG;
+
+    return xpc::GetSandboxAddonId(cx, sandbox, rval);
+}
+
+NS_IMETHODIMP
+nsXPCComponents_Utils::GetSandboxMetadata(HandleValue sandboxVal,
+                                          JSContext* cx, MutableHandleValue rval)
+{
+    if (!sandboxVal.isObject())
+        return NS_ERROR_INVALID_ARG;
+
+    RootedObject sandbox(cx, &sandboxVal.toObject());
+    sandbox = js::CheckedUnwrap(sandbox);
+    if (!sandbox || !xpc::IsSandbox(sandbox))
+        return NS_ERROR_INVALID_ARG;
+
+    return xpc::GetSandboxMetadata(cx, sandbox, rval);
+}
+
+NS_IMETHODIMP
+nsXPCComponents_Utils::SetSandboxMetadata(HandleValue sandboxVal,
+                                          HandleValue metadataVal,
+                                          JSContext* cx)
+{
+    if (!sandboxVal.isObject())
+        return NS_ERROR_INVALID_ARG;
+
+    RootedObject sandbox(cx, &sandboxVal.toObject());
+    sandbox = js::CheckedUnwrap(sandbox);
+    if (!sandbox || !xpc::IsSandbox(sandbox))
+        return NS_ERROR_INVALID_ARG;
+
+    nsresult rv = xpc::SetSandboxMetadata(cx, sandbox, metadataVal);
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsXPCComponents_Utils::Import(const nsACString& registryLocation,
+                              HandleValue targetObj,
+                              JSContext* cx,
+                              uint8_t optionalArgc,
+                              MutableHandleValue retval)
+{
+    nsCOMPtr<xpcIJSModuleLoader> moduleloader =
+        do_GetService(MOZJSCOMPONENTLOADER_CONTRACTID);
+    if (!moduleloader)
+        return NS_ERROR_FAILURE;
+    return moduleloader->Import(registryLocation, targetObj, cx, optionalArgc, retval);
+}
+
+NS_IMETHODIMP
+nsXPCComponents_Utils::IsModuleLoaded(const nsACString& registryLocation, bool* retval)
+{
+    nsCOMPtr<xpcIJSModuleLoader> moduleloader =
+        do_GetService(MOZJSCOMPONENTLOADER_CONTRACTID);
+    if (!moduleloader)
+        return NS_ERROR_FAILURE;
+    return moduleloader->IsModuleLoaded(registryLocation, retval);
+}
+
+NS_IMETHODIMP
+nsXPCComponents_Utils::Unload(const nsACString & registryLocation)
+{
+    nsCOMPtr<xpcIJSModuleLoader> moduleloader =
+        do_GetService(MOZJSCOMPONENTLOADER_CONTRACTID);
+    if (!moduleloader)
+        return NS_ERROR_FAILURE;
+    return moduleloader->Unload(registryLocation);
+}
+
+NS_IMETHODIMP
+nsXPCComponents_Utils::ImportGlobalProperties(HandleValue aPropertyList,
+                                              JSContext* cx)
+{
+    RootedObject global(cx, CurrentGlobalOrNull(cx));
+    MOZ_ASSERT(global);
+
+    // Don't allow doing this if the global is a Window
+    nsGlobalWindow* win;
+    if (NS_SUCCEEDED(UNWRAP_OBJECT(Window, &global, win))) {
+        return NS_ERROR_NOT_AVAILABLE;
+    }
+
+    GlobalProperties options;
+    NS_ENSURE_TRUE(aPropertyList.isObject(), NS_ERROR_INVALID_ARG);
+
+    RootedObject propertyList(cx, &aPropertyList.toObject());
+    bool isArray;
+    if (NS_WARN_IF(!JS_IsArrayObject(cx, propertyList, &isArray))) {
+        return NS_ERROR_FAILURE;
+    }
+    if (NS_WARN_IF(!isArray)) {
+        return NS_ERROR_INVALID_ARG;
+    }
+
+    if (!options.Parse(cx, propertyList) ||
+        !options.DefineInXPCComponents(cx, global))
+    {
+        return NS_ERROR_FAILURE;
+    }
+
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsXPCComponents_Utils::GetWeakReference(HandleValue object, JSContext* cx,
+                                        xpcIJSWeakReference** _retval)
+{
+    RefPtr<xpcJSWeakReference> ref = new xpcJSWeakReference();
+    nsresult rv = ref->Init(cx, object);
+    NS_ENSURE_SUCCESS(rv, rv);
+    ref.forget(_retval);
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsXPCComponents_Utils::ForceGC()
+{
+    JSContext* cx = nsXPConnect::GetContextInstance()->Context();
+    PrepareForFullGC(cx);
+    GCForReason(cx, GC_NORMAL, gcreason::COMPONENT_UTILS);
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsXPCComponents_Utils::ForceCC(nsICycleCollectorListener* listener)
+{
+    nsJSContext::CycleCollectNow(listener);
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsXPCComponents_Utils::FinishCC()
+{
+    nsCycleCollector_finishAnyCurrentCollection();
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsXPCComponents_Utils::CcSlice(int64_t budget)
+{
+    nsJSContext::RunCycleCollectorWorkSlice(budget);
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsXPCComponents_Utils::GetMaxCCSliceTimeSinceClear(int32_t* out)
+{
+    *out = nsJSContext::GetMaxCCSliceTimeSinceClear();
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsXPCComponents_Utils::ClearMaxCCTime()
+{
+    nsJSContext::ClearMaxCCSliceTime();
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsXPCComponents_Utils::ForceShrinkingGC()
+{
+    JSContext* cx = dom::danger::GetJSContext();
+    PrepareForFullGC(cx);
+    GCForReason(cx, GC_SHRINK, gcreason::COMPONENT_UTILS);
+    return NS_OK;
+}
+
+class PreciseGCRunnable : public Runnable
+{
+  public:
+    PreciseGCRunnable(ScheduledGCCallback* aCallback, bool aShrinking)
+    : mCallback(aCallback), mShrinking(aShrinking) {}
+
+    NS_IMETHOD Run() override
+    {
+        JSContext* cx = dom::danger::GetJSContext();
+        if (JS_IsRunning(cx))
+            return NS_DispatchToMainThread(this);
+
+        nsJSContext::GarbageCollectNow(gcreason::COMPONENT_UTILS,
+                                       nsJSContext::NonIncrementalGC,
+                                       mShrinking ?
+                                         nsJSContext::ShrinkingGC :
+                                         nsJSContext::NonShrinkingGC);
+
+        mCallback->Callback();
+        return NS_OK;
+    }
+
+  private:
+    RefPtr<ScheduledGCCallback> mCallback;
+    bool mShrinking;
+};
+
+NS_IMETHODIMP
+nsXPCComponents_Utils::SchedulePreciseGC(ScheduledGCCallback* aCallback)
+{
+    RefPtr<PreciseGCRunnable> event = new PreciseGCRunnable(aCallback, false);
+    return NS_DispatchToMainThread(event);
+}
+
+NS_IMETHODIMP
+nsXPCComponents_Utils::SchedulePreciseShrinkingGC(ScheduledGCCallback* aCallback)
+{
+    RefPtr<PreciseGCRunnable> event = new PreciseGCRunnable(aCallback, true);
+    return NS_DispatchToMainThread(event);
+}
+
+NS_IMETHODIMP
+nsXPCComponents_Utils::UnlinkGhostWindows()
+{
+#ifdef DEBUG
+    nsWindowMemoryReporter::UnlinkGhostWindows();
+    return NS_OK;
+#else
+    return NS_ERROR_NOT_IMPLEMENTED;
+#endif
+}
+
+NS_IMETHODIMP
+nsXPCComponents_Utils::GetJSTestingFunctions(JSContext* cx,
+                                             MutableHandleValue retval)
+{
+    JSObject* obj = js::GetTestingFunctions(cx);
+    if (!obj)
+        return NS_ERROR_XPC_JAVASCRIPT_ERROR;
+    retval.setObject(*obj);
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsXPCComponents_Utils::CallFunctionWithAsyncStack(HandleValue function,
+                                                  nsIStackFrame* stack,
+                                                  const nsAString& asyncCause,
+                                                  JSContext* cx,
+                                                  MutableHandleValue retval)
+{
+    nsresult rv;
+
+    if (!stack || asyncCause.IsEmpty()) {
+        return NS_ERROR_INVALID_ARG;
+    }
+
+    JS::Rooted<JS::Value> asyncStack(cx);
+    rv = stack->GetNativeSavedFrame(&asyncStack);
+    if (NS_FAILED(rv))
+        return rv;
+    if (!asyncStack.isObject()) {
+        JS_ReportErrorASCII(cx, "Must use a native JavaScript stack frame");
+        return NS_ERROR_INVALID_ARG;
+    }
+
+    JS::Rooted<JSObject*> asyncStackObj(cx, &asyncStack.toObject());
+
+    NS_ConvertUTF16toUTF8 utf8Cause(asyncCause);
+    JS::AutoSetAsyncStackForNewCalls sas(cx, asyncStackObj, utf8Cause.get(),
+                                         JS::AutoSetAsyncStackForNewCalls::AsyncCallKind::EXPLICIT);
+
+    if (!JS_CallFunctionValue(cx, nullptr, function,
+                              JS::HandleValueArray::empty(), retval))
+    {
+        return NS_ERROR_XPC_JAVASCRIPT_ERROR;
+    }
+
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsXPCComponents_Utils::GetGlobalForObject(HandleValue object,
+                                          JSContext* cx,
+                                          MutableHandleValue retval)
+{
+    // First argument must be an object.
+    if (object.isPrimitive())
+        return NS_ERROR_XPC_BAD_CONVERT_JS;
+
+    // Wrappers are parented to their the global in their home compartment. But
+    // when getting the global for a cross-compartment wrapper, we really want
+    // a wrapper for the foreign global. So we need to unwrap before getting the
+    // parent, enter the compartment for the duration of the call, and wrap the
+    // result.
+    Rooted<JSObject*> obj(cx, &object.toObject());
+    obj = js::UncheckedUnwrap(obj);
+    {
+        JSAutoCompartment ac(cx, obj);
+        obj = JS_GetGlobalForObject(cx, obj);
+    }
+
+    if (!JS_WrapObject(cx, &obj))
+        return NS_ERROR_FAILURE;
+
+    // Get the WindowProxy if necessary.
+    obj = js::ToWindowProxyIfWindow(obj);
+
+    retval.setObject(*obj);
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsXPCComponents_Utils::IsProxy(HandleValue vobj, JSContext* cx, bool* rval)
+{
+    if (!vobj.isObject()) {
+        *rval = false;
+        return NS_OK;
+    }
+
+    RootedObject obj(cx, &vobj.toObject());
+    obj = js::CheckedUnwrap(obj, /* stopAtWindowProxy = */ false);
+    NS_ENSURE_TRUE(obj, NS_ERROR_FAILURE);
+
+    *rval = js::IsScriptedProxy(obj);
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsXPCComponents_Utils::ExportFunction(HandleValue vfunction, HandleValue vscope,
+                                      HandleValue voptions, JSContext* cx,
+                                      MutableHandleValue rval)
+{
+    if (!xpc::ExportFunction(cx, vfunction, vscope, voptions, rval))
+        return NS_ERROR_FAILURE;
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsXPCComponents_Utils::CreateObjectIn(HandleValue vobj, HandleValue voptions,
+                                      JSContext* cx, MutableHandleValue rval)
+{
+    RootedObject optionsObject(cx, voptions.isObject() ? &voptions.toObject()
+                                                       : nullptr);
+    CreateObjectInOptions options(cx, optionsObject);
+    if (voptions.isObject() &&
+        !options.Parse())
+    {
+        return NS_ERROR_FAILURE;
+    }
+
+    if (!xpc::CreateObjectIn(cx, vobj, options, rval))
+        return NS_ERROR_FAILURE;
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsXPCComponents_Utils::MakeObjectPropsNormal(HandleValue vobj, JSContext* cx)
+{
+    if (!cx)
+        return NS_ERROR_FAILURE;
+
+    // first argument must be an object
+    if (vobj.isPrimitive())
+        return NS_ERROR_XPC_BAD_CONVERT_JS;
+
+    RootedObject obj(cx, js::UncheckedUnwrap(&vobj.toObject()));
+    JSAutoCompartment ac(cx, obj);
+    Rooted<IdVector> ida(cx, IdVector(cx));
+    if (!JS_Enumerate(cx, obj, &ida))
+        return NS_ERROR_FAILURE;
+
+    RootedId id(cx);
+    RootedValue v(cx);
+    for (size_t i = 0; i < ida.length(); ++i) {
+        id = ida[i];
+
+        if (!JS_GetPropertyById(cx, obj, id, &v))
+            return NS_ERROR_FAILURE;
+
+        if (v.isPrimitive())
+            continue;
+
+        RootedObject propobj(cx, &v.toObject());
+        // TODO Deal with non-functions.
+        if (!js::IsWrapper(propobj) || !JS::IsCallable(propobj))
+            continue;
+
+        FunctionForwarderOptions forwarderOptions;
+        if (!NewFunctionForwarder(cx, id, propobj, forwarderOptions, &v) ||
+            !JS_SetPropertyById(cx, obj, id, v))
+            return NS_ERROR_FAILURE;
+    }
+
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsXPCComponents_Utils::IsDeadWrapper(HandleValue obj, bool* out)
+{
+    *out = false;
+    if (obj.isPrimitive())
+        return NS_ERROR_INVALID_ARG;
+
+    // Make sure to unwrap first. Once a proxy is nuked, it ceases to be a
+    // wrapper, meaning that, if passed to another compartment, we'll generate
+    // a CCW for it. Make sure that IsDeadWrapper sees through the confusion.
+    *out = JS_IsDeadWrapper(js::CheckedUnwrap(&obj.toObject()));
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsXPCComponents_Utils::IsCrossProcessWrapper(HandleValue obj, bool* out)
+{
+    *out = false;
+    if (obj.isPrimitive())
+        return NS_ERROR_INVALID_ARG;
+
+    *out = jsipc::IsWrappedCPOW(&obj.toObject());
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsXPCComponents_Utils::GetCrossProcessWrapperTag(HandleValue obj, nsACString& out)
+{
+    if (obj.isPrimitive() || !jsipc::IsWrappedCPOW(&obj.toObject()))
+        return NS_ERROR_INVALID_ARG;
+
+    jsipc::GetWrappedCPOWTag(&obj.toObject(), out);
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsXPCComponents_Utils::PermitCPOWsInScope(HandleValue obj)
+{
+    if (!obj.isObject())
+        return NS_ERROR_INVALID_ARG;
+
+    JSObject* scopeObj = js::UncheckedUnwrap(&obj.toObject());
+    CompartmentPrivate::Get(scopeObj)->allowCPOWs = true;
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsXPCComponents_Utils::RecomputeWrappers(HandleValue vobj, JSContext* cx)
+{
+    // Determine the compartment of the given object, if any.
+    JSCompartment* c = vobj.isObject()
+                       ? js::GetObjectCompartment(js::UncheckedUnwrap(&vobj.toObject()))
+                       : nullptr;
+
+    // If no compartment was given, recompute all.
+    if (!c)
+        js::RecomputeWrappers(cx, js::AllCompartments(), js::AllCompartments());
+    // Otherwise, recompute wrappers for the given compartment.
+    else
+        js::RecomputeWrappers(cx, js::SingleCompartment(c), js::AllCompartments()) &&
+        js::RecomputeWrappers(cx, js::AllCompartments(), js::SingleCompartment(c));
+
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsXPCComponents_Utils::SetWantXrays(HandleValue vscope, JSContext* cx)
+{
+    if (!vscope.isObject())
+        return NS_ERROR_INVALID_ARG;
+    JSObject* scopeObj = js::UncheckedUnwrap(&vscope.toObject());
+    JSCompartment* compartment = js::GetObjectCompartment(scopeObj);
+    CompartmentPrivate::Get(scopeObj)->wantXrays = true;
+    bool ok = js::RecomputeWrappers(cx, js::SingleCompartment(compartment),
+                                    js::AllCompartments());
+    NS_ENSURE_TRUE(ok, NS_ERROR_FAILURE);
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsXPCComponents_Utils::ForcePermissiveCOWs(JSContext* cx)
+{
+    CrashIfNotInAutomation();
+    CompartmentPrivate::Get(CurrentGlobalOrNull(cx))->forcePermissiveCOWs = true;
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsXPCComponents_Utils::ForcePrivilegedComponentsForScope(HandleValue vscope,
+                                                         JSContext* cx)
+{
+    if (!vscope.isObject())
+        return NS_ERROR_INVALID_ARG;
+    CrashIfNotInAutomation();
+    JSObject* scopeObj = js::UncheckedUnwrap(&vscope.toObject());
+    XPCWrappedNativeScope* scope = ObjectScope(scopeObj);
+    scope->ForcePrivilegedComponents();
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsXPCComponents_Utils::GetComponentsForScope(HandleValue vscope, JSContext* cx,
+                                             MutableHandleValue rval)
+{
+    if (!vscope.isObject())
+        return NS_ERROR_INVALID_ARG;
+    JSObject* scopeObj = js::UncheckedUnwrap(&vscope.toObject());
+    XPCWrappedNativeScope* scope = ObjectScope(scopeObj);
+    RootedObject components(cx);
+    if (!scope->GetComponentsJSObject(&components))
+        return NS_ERROR_FAILURE;
+    if (!JS_WrapObject(cx, &components))
+        return NS_ERROR_FAILURE;
+    rval.setObject(*components);
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsXPCComponents_Utils::Dispatch(HandleValue runnableArg, HandleValue scope,
+                                JSContext* cx)
+{
+    RootedValue runnable(cx, runnableArg);
+    // Enter the given compartment, if any, and rewrap runnable.
+    Maybe<JSAutoCompartment> ac;
+    if (scope.isObject()) {
+        JSObject* scopeObj = js::UncheckedUnwrap(&scope.toObject());
+        if (!scopeObj)
+            return NS_ERROR_FAILURE;
+        ac.emplace(cx, scopeObj);
+        if (!JS_WrapValue(cx, &runnable))
+            return NS_ERROR_FAILURE;
+    }
+
+    // Get an XPCWrappedJS for |runnable|.
+    if (!runnable.isObject())
+        return NS_ERROR_INVALID_ARG;
+
+    nsCOMPtr<nsIRunnable> run;
+    nsresult rv = nsXPConnect::XPConnect()->WrapJS(cx, &runnable.toObject(),
+                                                   NS_GET_IID(nsIRunnable),
+                                                   getter_AddRefs(run));
+    NS_ENSURE_SUCCESS(rv, rv);
+    MOZ_ASSERT(run);
+
+    // Dispatch.
+    return NS_DispatchToMainThread(run);
+}
+
+#define GENERATE_JSCONTEXTOPTION_GETTER_SETTER(_attr, _getter, _setter) \
+    NS_IMETHODIMP                                                       \
+    nsXPCComponents_Utils::Get## _attr(JSContext* cx, bool* aValue)     \
+    {                                                                   \
+        *aValue = ContextOptionsRef(cx)._getter();                      \
+        return NS_OK;                                                   \
+    }                                                                   \
+    NS_IMETHODIMP                                                       \
+    nsXPCComponents_Utils::Set## _attr(JSContext* cx, bool aValue)      \
+    {                                                                   \
+        ContextOptionsRef(cx)._setter(aValue);                          \
+        return NS_OK;                                                   \
+    }
+
+GENERATE_JSCONTEXTOPTION_GETTER_SETTER(Strict, extraWarnings, setExtraWarnings)
+GENERATE_JSCONTEXTOPTION_GETTER_SETTER(Werror, werror, setWerror)
+GENERATE_JSCONTEXTOPTION_GETTER_SETTER(Strict_mode, strictMode, setStrictMode)
+GENERATE_JSCONTEXTOPTION_GETTER_SETTER(Ion, ion, setIon)
+
+#undef GENERATE_JSCONTEXTOPTION_GETTER_SETTER
+
+NS_IMETHODIMP
+nsXPCComponents_Utils::SetGCZeal(int32_t aValue, JSContext* cx)
+{
+#ifdef JS_GC_ZEAL
+    JS_SetGCZeal(cx, uint8_t(aValue), JS_DEFAULT_ZEAL_FREQ);
+#endif
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsXPCComponents_Utils::NukeSandbox(HandleValue obj, JSContext* cx)
+{
+    PROFILER_LABEL_FUNC(js::ProfileEntry::Category::JS);
+    NS_ENSURE_TRUE(obj.isObject(), NS_ERROR_INVALID_ARG);
+    JSObject* wrapper = &obj.toObject();
+    NS_ENSURE_TRUE(IsWrapper(wrapper), NS_ERROR_INVALID_ARG);
+    JSObject* sb = UncheckedUnwrap(wrapper);
+    NS_ENSURE_TRUE(IsSandbox(sb), NS_ERROR_INVALID_ARG);
+    NukeCrossCompartmentWrappers(cx, AllCompartments(),
+                                 SingleCompartment(GetObjectCompartment(sb)),
+                                 NukeWindowReferences);
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsXPCComponents_Utils::BlockScriptForGlobal(HandleValue globalArg,
+                                            JSContext* cx)
+{
+    NS_ENSURE_TRUE(globalArg.isObject(), NS_ERROR_INVALID_ARG);
+    RootedObject global(cx, UncheckedUnwrap(&globalArg.toObject(),
+                                            /* stopAtWindowProxy = */ false));
+    NS_ENSURE_TRUE(JS_IsGlobalObject(global), NS_ERROR_INVALID_ARG);
+    if (nsContentUtils::IsSystemPrincipal(xpc::GetObjectPrincipal(global))) {
+        JS_ReportErrorASCII(cx, "Script may not be disabled for system globals");
+        return NS_ERROR_FAILURE;
+    }
+    Scriptability::Get(global).Block();
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsXPCComponents_Utils::UnblockScriptForGlobal(HandleValue globalArg,
+                                              JSContext* cx)
+{
+    NS_ENSURE_TRUE(globalArg.isObject(), NS_ERROR_INVALID_ARG);
+    RootedObject global(cx, UncheckedUnwrap(&globalArg.toObject(),
+                                            /* stopAtWindowProxy = */ false));
+    NS_ENSURE_TRUE(JS_IsGlobalObject(global), NS_ERROR_INVALID_ARG);
+    if (nsContentUtils::IsSystemPrincipal(xpc::GetObjectPrincipal(global))) {
+        JS_ReportErrorASCII(cx, "Script may not be disabled for system globals");
+        return NS_ERROR_FAILURE;
+    }
+    Scriptability::Get(global).Unblock();
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsXPCComponents_Utils::IsXrayWrapper(HandleValue obj, bool* aRetval)
+{
+    *aRetval =
+        obj.isObject() && xpc::WrapperFactory::IsXrayWrapper(&obj.toObject());
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsXPCComponents_Utils::WaiveXrays(HandleValue aVal, JSContext* aCx, MutableHandleValue aRetval)
+{
+    RootedValue value(aCx, aVal);
+    if (!xpc::WrapperFactory::WaiveXrayAndWrap(aCx, &value))
+        return NS_ERROR_FAILURE;
+    aRetval.set(value);
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsXPCComponents_Utils::UnwaiveXrays(HandleValue aVal, JSContext* aCx, MutableHandleValue aRetval)
+{
+    if (!aVal.isObject()) {
+        aRetval.set(aVal);
+        return NS_OK;
+    }
+
+    RootedObject obj(aCx, js::UncheckedUnwrap(&aVal.toObject()));
+    if (!JS_WrapObject(aCx, &obj))
+        return NS_ERROR_FAILURE;
+    aRetval.setObject(*obj);
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsXPCComponents_Utils::GetClassName(HandleValue aObj, bool aUnwrap, JSContext* aCx, char** aRv)
+{
+    if (!aObj.isObject())
+        return NS_ERROR_INVALID_ARG;
+    RootedObject obj(aCx, &aObj.toObject());
+    if (aUnwrap)
+        obj = js::UncheckedUnwrap(obj, /* stopAtWindowProxy = */ false);
+    *aRv = NS_strdup(js::GetObjectClass(obj)->name);
+    NS_ENSURE_TRUE(*aRv, NS_ERROR_OUT_OF_MEMORY);
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsXPCComponents_Utils::GetDOMClassInfo(const nsAString& aClassName,
+                                       nsIClassInfo** aClassInfo)
+{
+    *aClassInfo = nullptr;
+    return NS_ERROR_NOT_AVAILABLE;
+}
+
+NS_IMETHODIMP
+nsXPCComponents_Utils::GetIncumbentGlobal(HandleValue aCallback,
+                                          JSContext* aCx, MutableHandleValue aOut)
+{
+    nsCOMPtr<nsIGlobalObject> global = mozilla::dom::GetIncumbentGlobal();
+    RootedValue globalVal(aCx);
+
+    if (!global) {
+        globalVal = NullValue();
+    } else {
+        // Note: We rely on the wrap call for outerization.
+        globalVal = ObjectValue(*global->GetGlobalJSObject());
+        if (!JS_WrapValue(aCx, &globalVal))
+            return NS_ERROR_FAILURE;
+    }
+
+    // Invoke the callback, if passed.
+    if (aCallback.isObject()) {
+        RootedValue ignored(aCx);
+        if (!JS_CallFunctionValue(aCx, nullptr, aCallback, JS::HandleValueArray(globalVal), &ignored))
+            return NS_ERROR_FAILURE;
+    }
+
+    aOut.set(globalVal);
+    return NS_OK;
+}
+
+/*
+ * Below is a bunch of awkward junk to allow JS test code to trigger the
+ * creation of an XPCWrappedJS, such that it ends up in the map. We need to
+ * hand the caller some sort of reference to hold onto (to prevent the
+ * refcount from dropping to zero as soon as the function returns), but trying
+ * to return a bonafide XPCWrappedJS to script causes all sorts of trouble. So
+ * we create a benign holder class instead, which acts as an opaque reference
+ * that script can use to keep the XPCWrappedJS alive and in the map.
+ */
+
+class WrappedJSHolder : public nsISupports
+{
+    NS_DECL_ISUPPORTS
+    WrappedJSHolder() {}
+
+    RefPtr<nsXPCWrappedJS> mWrappedJS;
+
+private:
+    virtual ~WrappedJSHolder() {}
+};
+NS_IMPL_ISUPPORTS0(WrappedJSHolder);
+
+NS_IMETHODIMP
+nsXPCComponents_Utils::GenerateXPCWrappedJS(HandleValue aObj, HandleValue aScope,
+                                            JSContext* aCx, nsISupports** aOut)
+{
+    if (!aObj.isObject())
+        return NS_ERROR_INVALID_ARG;
+    RootedObject obj(aCx, &aObj.toObject());
+    RootedObject scope(aCx, aScope.isObject() ? js::UncheckedUnwrap(&aScope.toObject())
+                                              : CurrentGlobalOrNull(aCx));
+    JSAutoCompartment ac(aCx, scope);
+    if (!JS_WrapObject(aCx, &obj))
+        return NS_ERROR_FAILURE;
+
+    RefPtr<WrappedJSHolder> holder = new WrappedJSHolder();
+    nsresult rv = nsXPCWrappedJS::GetNewOrUsed(obj, NS_GET_IID(nsISupports),
+                                               getter_AddRefs(holder->mWrappedJS));
+    holder.forget(aOut);
+    return rv;
+}
+
+NS_IMETHODIMP
+nsXPCComponents_Utils::GetWatchdogTimestamp(const nsAString& aCategory, PRTime* aOut)
+{
+    WatchdogTimestampCategory category;
+    if (aCategory.EqualsLiteral("ContextStateChange"))
+        category = TimestampContextStateChange;
+    else if (aCategory.EqualsLiteral("WatchdogWakeup"))
+        category = TimestampWatchdogWakeup;
+    else if (aCategory.EqualsLiteral("WatchdogHibernateStart"))
+        category = TimestampWatchdogHibernateStart;
+    else if (aCategory.EqualsLiteral("WatchdogHibernateStop"))
+        category = TimestampWatchdogHibernateStop;
+    else
+        return NS_ERROR_INVALID_ARG;
+    *aOut = XPCJSContext::Get()->GetWatchdogTimestamp(category);
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsXPCComponents_Utils::GetJSEngineTelemetryValue(JSContext* cx, MutableHandleValue rval)
+{
+    RootedObject obj(cx, JS_NewPlainObject(cx));
+    if (!obj)
+        return NS_ERROR_OUT_OF_MEMORY;
+
+    unsigned attrs = JSPROP_ENUMERATE | JSPROP_READONLY | JSPROP_PERMANENT;
+
+    size_t i = JS_SetProtoCalled(cx);
+    RootedValue v(cx, DoubleValue(i));
+    if (!JS_DefineProperty(cx, obj, "setProto", v, attrs))
+        return NS_ERROR_OUT_OF_MEMORY;
+
+    i = JS_GetCustomIteratorCount(cx);
+    v.setDouble(i);
+    if (!JS_DefineProperty(cx, obj, "customIter", v, attrs))
+        return NS_ERROR_OUT_OF_MEMORY;
+
+    rval.setObject(*obj);
+    return NS_OK;
+}
+
+bool
+xpc::CloneInto(JSContext* aCx, HandleValue aValue, HandleValue aScope,
+               HandleValue aOptions, MutableHandleValue aCloned)
+{
+    if (!aScope.isObject())
+        return false;
+
+    RootedObject scope(aCx, &aScope.toObject());
+    scope = js::CheckedUnwrap(scope);
+    if(!scope) {
+        JS_ReportErrorASCII(aCx, "Permission denied to clone object into scope");
+        return false;
+    }
+
+    if (!aOptions.isUndefined() && !aOptions.isObject()) {
+        JS_ReportErrorASCII(aCx, "Invalid argument");
+        return false;
+    }
+
+    RootedObject optionsObject(aCx, aOptions.isObject() ? &aOptions.toObject()
+                                                        : nullptr);
+    StackScopedCloneOptions options(aCx, optionsObject);
+    if (aOptions.isObject() && !options.Parse())
+        return false;
+
+    {
+        JSAutoCompartment ac(aCx, scope);
+        aCloned.set(aValue);
+        if (!StackScopedClone(aCx, options, aCloned))
+            return false;
+    }
+
+    return JS_WrapValue(aCx, aCloned);
+}
+
+NS_IMETHODIMP
+nsXPCComponents_Utils::CloneInto(HandleValue aValue, HandleValue aScope,
+                                 HandleValue aOptions, JSContext* aCx,
+                                 MutableHandleValue aCloned)
+{
+    return xpc::CloneInto(aCx, aValue, aScope, aOptions, aCloned) ?
+           NS_OK : NS_ERROR_FAILURE;
+}
+
+NS_IMETHODIMP
+nsXPCComponents_Utils::GetWebIDLCallerPrincipal(nsIPrincipal** aResult)
+{
+    // This API may only be when the Entry Settings Object corresponds to a
+    // JS-implemented WebIDL call. In all other cases, the value will be null,
+    // and we throw.
+    nsCOMPtr<nsIPrincipal> callerPrin = mozilla::dom::GetWebIDLCallerPrincipal();
+    if (!callerPrin)
+        return NS_ERROR_NOT_AVAILABLE;
+    callerPrin.forget(aResult);
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsXPCComponents_Utils::GetObjectPrincipal(HandleValue val, JSContext* cx,
+                                          nsIPrincipal** result)
+{
+    if (!val.isObject())
+        return NS_ERROR_INVALID_ARG;
+    RootedObject obj(cx, &val.toObject());
+    obj = js::CheckedUnwrap(obj);
+    MOZ_ASSERT(obj);
+
+    nsCOMPtr<nsIPrincipal> prin = nsContentUtils::ObjectPrincipal(obj);
+    prin.forget(result);
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsXPCComponents_Utils::GetCompartmentLocation(HandleValue val,
+                                              JSContext* cx,
+                                              nsACString& result)
+{
+    if (!val.isObject())
+        return NS_ERROR_INVALID_ARG;
+    RootedObject obj(cx, &val.toObject());
+    obj = js::CheckedUnwrap(obj);
+    MOZ_ASSERT(obj);
+
+    result = xpc::CompartmentPrivate::Get(obj)->GetLocation();
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsXPCComponents_Utils::SetAddonInterposition(const nsACString& addonIdStr,
+                                             nsIAddonInterposition* interposition,
+                                             JSContext* cx)
+{
+    JSAddonId* addonId = xpc::NewAddonId(cx, addonIdStr);
+    if (!addonId)
+        return NS_ERROR_FAILURE;
+    if (!XPCWrappedNativeScope::SetAddonInterposition(cx, addonId, interposition))
+        return NS_ERROR_FAILURE;
+
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsXPCComponents_Utils::SetAddonCallInterposition(HandleValue target,
+                                                 JSContext* cx)
+{
+    NS_ENSURE_TRUE(target.isObject(), NS_ERROR_INVALID_ARG);
+    RootedObject targetObj(cx, &target.toObject());
+    targetObj = js::CheckedUnwrap(targetObj);
+    NS_ENSURE_TRUE(targetObj, NS_ERROR_INVALID_ARG);
+    XPCWrappedNativeScope* xpcScope = ObjectScope(targetObj);
+    NS_ENSURE_TRUE(xpcScope, NS_ERROR_INVALID_ARG);
+
+    xpcScope->SetAddonCallInterposition();
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsXPCComponents_Utils::AllowCPOWsInAddon(const nsACString& addonIdStr,
+                                         bool allow,
+                                         JSContext* cx)
+{
+    JSAddonId* addonId = xpc::NewAddonId(cx, addonIdStr);
+    if (!addonId)
+        return NS_ERROR_FAILURE;
+    if (!XPCWrappedNativeScope::AllowCPOWsInAddon(cx, addonId, allow))
+        return NS_ERROR_FAILURE;
+
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsXPCComponents_Utils::Now(double* aRetval)
+{
+    bool isInconsistent = false;
+    TimeStamp start = TimeStamp::ProcessCreation(isInconsistent);
+    *aRetval = (TimeStamp::Now() - start).ToMilliseconds();
+    return NS_OK;
+}
+
+/***************************************************************************/
+/***************************************************************************/
+/***************************************************************************/
+
+
+nsXPCComponentsBase::nsXPCComponentsBase(XPCWrappedNativeScope* aScope)
+    :   mScope(aScope)
+{
+    MOZ_ASSERT(aScope, "aScope must not be null");
+}
+
+nsXPCComponents::nsXPCComponents(XPCWrappedNativeScope* aScope)
+    :   nsXPCComponentsBase(aScope)
+{
+}
+
+nsXPCComponentsBase::~nsXPCComponentsBase()
+{
+}
+
+nsXPCComponents::~nsXPCComponents()
+{
+}
+
+void
+nsXPCComponentsBase::ClearMembers()
+{
+    mInterfaces = nullptr;
+    mInterfacesByID = nullptr;
+    mResults = nullptr;
+}
+
+void
+nsXPCComponents::ClearMembers()
+{
+    mClasses = nullptr;
+    mClassesByID = nullptr;
+    mID = nullptr;
+    mException = nullptr;
+    mConstructor = nullptr;
+    mUtils = nullptr;
+
+    nsXPCComponentsBase::ClearMembers();
+}
+
+/*******************************************/
+#define XPC_IMPL_GET_OBJ_METHOD(_class, _n)                                   \
+NS_IMETHODIMP _class::Get##_n(nsIXPCComponents_##_n * *a##_n) {               \
+    NS_ENSURE_ARG_POINTER(a##_n);                                             \
+    if (!m##_n)                                                               \
+        m##_n = new nsXPCComponents_##_n();                                   \
+    RefPtr<nsXPCComponents_##_n> ret = m##_n;                               \
+    ret.forget(a##_n);                                                        \
+    return NS_OK;                                                             \
+}
+
+XPC_IMPL_GET_OBJ_METHOD(nsXPCComponentsBase, Interfaces)
+XPC_IMPL_GET_OBJ_METHOD(nsXPCComponentsBase, InterfacesByID)
+XPC_IMPL_GET_OBJ_METHOD(nsXPCComponents, Classes)
+XPC_IMPL_GET_OBJ_METHOD(nsXPCComponents, ClassesByID)
+XPC_IMPL_GET_OBJ_METHOD(nsXPCComponentsBase, Results)
+XPC_IMPL_GET_OBJ_METHOD(nsXPCComponents, ID)
+XPC_IMPL_GET_OBJ_METHOD(nsXPCComponents, Exception)
+XPC_IMPL_GET_OBJ_METHOD(nsXPCComponents, Constructor)
+XPC_IMPL_GET_OBJ_METHOD(nsXPCComponents, Utils)
+
+#undef XPC_IMPL_GET_OBJ_METHOD
+/*******************************************/
+
+NS_IMETHODIMP
+nsXPCComponentsBase::IsSuccessCode(nsresult result, bool* out)
+{
+    *out = NS_SUCCEEDED(result);
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsXPCComponents::GetStack(nsIStackFrame * *aStack)
+{
+    nsresult rv;
+    nsXPConnect* xpc = nsXPConnect::XPConnect();
+    rv = xpc->GetCurrentJSStack(aStack);
+    return rv;
+}
+
+NS_IMETHODIMP
+nsXPCComponents::GetManager(nsIComponentManager * *aManager)
+{
+    MOZ_ASSERT(aManager, "bad param");
+    return NS_GetComponentManager(aManager);
+}
+
+NS_IMETHODIMP
+nsXPCComponents::GetReturnCode(JSContext* aCx, MutableHandleValue aOut)
+{
+    nsresult res = XPCJSContext::Get()->GetPendingResult();
+    aOut.setNumber(static_cast<uint32_t>(res));
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsXPCComponents::SetReturnCode(JSContext* aCx, HandleValue aCode)
+{
+    nsresult rv;
+    if (!ToUint32(aCx, aCode, (uint32_t*)&rv))
+        return NS_ERROR_FAILURE;
+    XPCJSContext::Get()->SetPendingResult(rv);
+    return NS_OK;
+}
+
+// static
+NS_IMETHODIMP nsXPCComponents::ReportError(HandleValue error, JSContext* cx)
+{
+    NS_WARNING("Components.reportError deprecated, use Components.utils.reportError");
+
+    nsCOMPtr<nsIXPCComponents_Utils> utils;
+    nsresult rv = GetUtils(getter_AddRefs(utils));
+    if (NS_FAILED(rv))
+        return rv;
+
+    return utils->ReportError(error, cx);
+}
+
+/**********************************************/
+
+class ComponentsSH : public nsIXPCScriptable
+{
+public:
+    explicit constexpr ComponentsSH(unsigned dummy)
+    {
+    }
+
+    // We don't actually inherit any ref counting infrastructure, but we don't
+    // need an nsAutoRefCnt member, so the _INHERITED macro is a hack to avoid
+    // having one.
+    NS_DECL_ISUPPORTS_INHERITED
+    NS_DECL_NSIXPCSCRIPTABLE
+    static nsresult Get(nsIXPCScriptable** helper)
+    {
+        *helper = &singleton;
+        return NS_OK;
+    }
+
+private:
+    static ComponentsSH singleton;
+};
+
+ComponentsSH ComponentsSH::singleton(0);
+
+// Singleton refcounting.
+NS_IMETHODIMP_(MozExternalRefCountType) ComponentsSH::AddRef(void) { return 1; }
+NS_IMETHODIMP_(MozExternalRefCountType) ComponentsSH::Release(void) { return 1; }
+
+NS_INTERFACE_MAP_BEGIN(ComponentsSH)
+  NS_INTERFACE_MAP_ENTRY(nsIXPCScriptable)
+  NS_INTERFACE_MAP_ENTRY(nsISupports)
+NS_INTERFACE_MAP_END
+
+#define NSXPCCOMPONENTSBASE_CID \
+{ 0xc62998e5, 0x95f1, 0x4058, \
+  { 0xa5, 0x09, 0xec, 0x21, 0x66, 0x18, 0x92, 0xb9 } }
+
+#define NSXPCCOMPONENTS_CID \
+{ 0x3649f405, 0xf0ec, 0x4c28, \
+    { 0xae, 0xb0, 0xaf, 0x9a, 0x51, 0xe4, 0x4c, 0x81 } }
+
+NS_IMPL_CLASSINFO(nsXPCComponentsBase, &ComponentsSH::Get, nsIClassInfo::DOM_OBJECT, NSXPCCOMPONENTSBASE_CID)
+NS_IMPL_ISUPPORTS_CI(nsXPCComponentsBase, nsIXPCComponentsBase)
+
+NS_IMPL_CLASSINFO(nsXPCComponents, &ComponentsSH::Get, nsIClassInfo::DOM_OBJECT, NSXPCCOMPONENTS_CID)
+// Below is more or less what NS_IMPL_ISUPPORTS_CI_INHERITED1 would look like
+// if it existed.
+NS_IMPL_ADDREF_INHERITED(nsXPCComponents, nsXPCComponentsBase)
+NS_IMPL_RELEASE_INHERITED(nsXPCComponents, nsXPCComponentsBase)
+NS_INTERFACE_MAP_BEGIN(nsXPCComponents)
+    NS_INTERFACE_MAP_ENTRY(nsIXPCComponents)
+    NS_IMPL_QUERY_CLASSINFO(nsXPCComponents)
+NS_INTERFACE_MAP_END_INHERITING(nsXPCComponentsBase)
+NS_IMPL_CI_INTERFACE_GETTER(nsXPCComponents, nsIXPCComponents)
+
+// The nsIXPCScriptable map declaration that will generate stubs for us
+#define XPC_MAP_CLASSNAME           ComponentsSH
+#define XPC_MAP_QUOTED_CLASSNAME   "nsXPCComponents"
+#define                             XPC_MAP_WANT_PRECREATE
+#include "xpc_map_end.h" /* This will #undef the above */
+
+NS_IMETHODIMP
+ComponentsSH::PreCreate(nsISupports* nativeObj, JSContext* cx, JSObject* globalObj, JSObject** parentObj)
+{
+  nsXPCComponentsBase* self = static_cast<nsXPCComponentsBase*>(nativeObj);
+  // this should never happen
+  if (!self->GetScope()) {
+      NS_WARNING("mScope must not be null when nsXPCComponents::PreCreate is called");
+      return NS_ERROR_FAILURE;
+  }
+  *parentObj = self->GetScope()->GetGlobalJSObject();
+  return NS_OK;
+}