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tenfourfox/js/xpconnect/src/XPCJSID.cpp

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/* -*- 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/. */
/* An xpcom implementation of the JavaScript nsIID and nsCID objects. */
#include "xpcprivate.h"
#include "mozilla/dom/BindingUtils.h"
#include "mozilla/Attributes.h"
#include "mozilla/jsipc/CrossProcessObjectWrappers.h"
#include "mozilla/StaticPtr.h"
using namespace mozilla::dom;
using namespace JS;
/***************************************************************************/
// nsJSID
NS_IMPL_CLASSINFO(nsJSID, nullptr, 0, NS_JS_ID_CID)
NS_IMPL_ISUPPORTS_CI(nsJSID, nsIJSID)
const char nsJSID::gNoString[] = "";
nsJSID::nsJSID()
: mID(GetInvalidIID()),
mNumber(const_cast<char*>(gNoString)),
mName(const_cast<char*>(gNoString))
{
}
nsJSID::~nsJSID()
{
if (mNumber && mNumber != gNoString)
free(mNumber);
if (mName && mName != gNoString)
free(mName);
}
void nsJSID::Reset()
{
mID = GetInvalidIID();
if (mNumber && mNumber != gNoString)
free(mNumber);
if (mName && mName != gNoString)
free(mName);
mNumber = mName = nullptr;
}
bool
nsJSID::SetName(const char* name)
{
MOZ_ASSERT(!mName || mName == gNoString ,"name already set");
MOZ_ASSERT(name,"null name");
mName = NS_strdup(name);
return mName ? true : false;
}
NS_IMETHODIMP
nsJSID::GetName(char * *aName)
{
if (!aName)
return NS_ERROR_NULL_POINTER;
if (!NameIsSet())
SetNameToNoString();
MOZ_ASSERT(mName, "name not set");
*aName = NS_strdup(mName);
return *aName ? NS_OK : NS_ERROR_OUT_OF_MEMORY;
}
NS_IMETHODIMP
nsJSID::GetNumber(char * *aNumber)
{
if (!aNumber)
return NS_ERROR_NULL_POINTER;
if (!mNumber) {
if (!(mNumber = mID.ToString()))
mNumber = const_cast<char*>(gNoString);
}
*aNumber = NS_strdup(mNumber);
return *aNumber ? NS_OK : NS_ERROR_OUT_OF_MEMORY;
}
NS_IMETHODIMP_(const nsID*)
nsJSID::GetID()
{
return &mID;
}
NS_IMETHODIMP
nsJSID::GetValid(bool* aValid)
{
if (!aValid)
return NS_ERROR_NULL_POINTER;
*aValid = IsValid();
return NS_OK;
}
NS_IMETHODIMP
nsJSID::Equals(nsIJSID* other, bool* _retval)
{
if (!_retval)
return NS_ERROR_NULL_POINTER;
if (!other || mID.Equals(GetInvalidIID())) {
*_retval = false;
return NS_OK;
}
*_retval = other->GetID()->Equals(mID);
return NS_OK;
}
NS_IMETHODIMP
nsJSID::Initialize(const char* idString)
{
if (!idString)
return NS_ERROR_NULL_POINTER;
if (*idString != '\0' && mID.Equals(GetInvalidIID())) {
Reset();
if (idString[0] == '{') {
if (mID.Parse(idString)) {
return NS_OK;
}
// error - reset to invalid state
mID = GetInvalidIID();
}
}
return NS_ERROR_FAILURE;
}
bool
nsJSID::InitWithName(const nsID& id, const char* nameString)
{
MOZ_ASSERT(nameString, "no name");
Reset();
mID = id;
return SetName(nameString);
}
// try to use the name, if no name, then use the number
NS_IMETHODIMP
nsJSID::ToString(char** _retval)
{
if (mName && mName != gNoString)
return GetName(_retval);
return GetNumber(_retval);
}
const nsID&
nsJSID::GetInvalidIID() const
{
// {BB1F47B0-D137-11d2-9841-006008962422}
static const nsID invalid = {0xbb1f47b0, 0xd137, 0x11d2,
{0x98, 0x41, 0x0, 0x60, 0x8, 0x96, 0x24, 0x22}};
return invalid;
}
//static
already_AddRefed<nsJSID>
nsJSID::NewID(const char* str)
{
if (!str) {
NS_ERROR("no string");
return nullptr;
}
RefPtr<nsJSID> idObj = new nsJSID();
NS_ENSURE_SUCCESS(idObj->Initialize(str), nullptr);
return idObj.forget();
}
//static
already_AddRefed<nsJSID>
nsJSID::NewID(const nsID& id)
{
RefPtr<nsJSID> idObj = new nsJSID();
idObj->mID = id;
idObj->mName = nullptr;
idObj->mNumber = nullptr;
return idObj.forget();
}
/***************************************************************************/
// Class object support so that we can share prototypes of wrapper
// This class exists just so we can have a shared scriptable helper for
// the nsJSIID class. The instances implement their own helpers. But we
// needed to be able to indicate to the shared prototypes this single flag:
// nsIXPCScriptable::DONT_ENUM_STATIC_PROPS. And having a class to do it is
// the only means we have. Setting this flag on any given instance scriptable
// helper is not sufficient to convey the information that we don't want
// static properties enumerated on the shared proto.
class SharedScriptableHelperForJSIID final : public nsIXPCScriptable
{
~SharedScriptableHelperForJSIID() {}
public:
NS_DECL_ISUPPORTS
NS_DECL_NSIXPCSCRIPTABLE
SharedScriptableHelperForJSIID() {}
};
NS_INTERFACE_MAP_BEGIN(SharedScriptableHelperForJSIID)
NS_INTERFACE_MAP_ENTRY(nsIXPCScriptable)
NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIXPCScriptable)
NS_INTERFACE_MAP_END
NS_IMPL_ADDREF(SharedScriptableHelperForJSIID)
NS_IMPL_RELEASE(SharedScriptableHelperForJSIID)
// The nsIXPCScriptable map declaration that will generate stubs for us...
#define XPC_MAP_CLASSNAME SharedScriptableHelperForJSIID
#define XPC_MAP_QUOTED_CLASSNAME "JSIID"
#define XPC_MAP_FLAGS nsIXPCScriptable::ALLOW_PROP_MODS_DURING_RESOLVE
#include "xpc_map_end.h" /* This will #undef the above */
static mozilla::StaticRefPtr<nsIXPCScriptable> gSharedScriptableHelperForJSIID;
static bool gClassObjectsWereInited = false;
static void EnsureClassObjectsInitialized()
{
if (!gClassObjectsWereInited) {
gSharedScriptableHelperForJSIID = new SharedScriptableHelperForJSIID();
gClassObjectsWereInited = true;
}
}
NS_METHOD GetSharedScriptableHelperForJSIID(nsIXPCScriptable** helper)
{
EnsureClassObjectsInitialized();
nsCOMPtr<nsIXPCScriptable> temp = gSharedScriptableHelperForJSIID.get();
temp.forget(helper);
return NS_OK;
}
/******************************************************/
#define NULL_CID \
{ 0x00000000, 0x0000, 0x0000, \
{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 } }
// We pass nsIClassInfo::DOM_OBJECT so that nsJSIID instances may be created
// in unprivileged scopes.
NS_DECL_CI_INTERFACE_GETTER(nsJSIID)
NS_IMPL_CLASSINFO(nsJSIID, GetSharedScriptableHelperForJSIID,
nsIClassInfo::DOM_OBJECT, NULL_CID)
NS_DECL_CI_INTERFACE_GETTER(nsJSCID)
NS_IMPL_CLASSINFO(nsJSCID, nullptr, 0, NULL_CID)
void xpc_DestroyJSxIDClassObjects()
{
if (gClassObjectsWereInited) {
NS_IF_RELEASE(NS_CLASSINFO_NAME(nsJSIID));
NS_IF_RELEASE(NS_CLASSINFO_NAME(nsJSCID));
gSharedScriptableHelperForJSIID = nullptr;
gClassObjectsWereInited = false;
}
}
/***************************************************************************/
NS_INTERFACE_MAP_BEGIN(nsJSIID)
NS_INTERFACE_MAP_ENTRY(nsIJSID)
NS_INTERFACE_MAP_ENTRY(nsIJSIID)
NS_INTERFACE_MAP_ENTRY(nsIXPCScriptable)
NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIJSID)
NS_IMPL_QUERY_CLASSINFO(nsJSIID)
NS_INTERFACE_MAP_END
NS_IMPL_ADDREF(nsJSIID)
NS_IMPL_RELEASE(nsJSIID)
NS_IMPL_CI_INTERFACE_GETTER(nsJSIID, nsIJSID, nsIJSIID)
// The nsIXPCScriptable map declaration that will generate stubs for us...
#define XPC_MAP_CLASSNAME nsJSIID
#define XPC_MAP_QUOTED_CLASSNAME "nsJSIID"
#define XPC_MAP_WANT_RESOLVE
#define XPC_MAP_WANT_ENUMERATE
#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 */
nsJSIID::nsJSIID(nsIInterfaceInfo* aInfo)
: mInfo(aInfo)
{
}
nsJSIID::~nsJSIID() {}
// If mInfo is present we use it and ignore mDetails, else we use mDetails.
NS_IMETHODIMP nsJSIID::GetName(char * *aName)
{
return mInfo->GetName(aName);
}
NS_IMETHODIMP nsJSIID::GetNumber(char * *aNumber)
{
char str[NSID_LENGTH];
const nsIID* id;
mInfo->GetIIDShared(&id);
id->ToProvidedString(str);
*aNumber = (char*) nsMemory::Clone(str, NSID_LENGTH);
return *aNumber ? NS_OK : NS_ERROR_OUT_OF_MEMORY;
}
NS_IMETHODIMP_(const nsID*) nsJSIID::GetID()
{
const nsIID* id;
mInfo->GetIIDShared(&id);
return id;
}
NS_IMETHODIMP nsJSIID::GetValid(bool* aValid)
{
*aValid = true;
return NS_OK;
}
NS_IMETHODIMP nsJSIID::Equals(nsIJSID* other, bool* _retval)
{
if (!_retval)
return NS_ERROR_NULL_POINTER;
if (!other) {
*_retval = false;
return NS_OK;
}
mInfo->IsIID(other->GetID(), _retval);
return NS_OK;
}
NS_IMETHODIMP nsJSIID::Initialize(const char* idString)
{
return NS_ERROR_FAILURE;
}
NS_IMETHODIMP nsJSIID::ToString(char** _retval)
{
return mInfo->GetName(_retval);
}
// static
already_AddRefed<nsJSIID>
nsJSIID::NewID(nsIInterfaceInfo* aInfo)
{
if (!aInfo) {
NS_ERROR("no info");
return nullptr;
}
bool canScript;
if (NS_FAILED(aInfo->IsScriptable(&canScript)) || !canScript)
return nullptr;
RefPtr<nsJSIID> idObj = new nsJSIID(aInfo);
return idObj.forget();
}
NS_IMETHODIMP
nsJSIID::Resolve(nsIXPConnectWrappedNative* wrapper,
JSContext * cx, JSObject * objArg,
jsid idArg, bool* resolvedp,
bool* _retval)
{
RootedObject obj(cx, objArg);
RootedId id(cx, idArg);
XPCCallContext ccx(JS_CALLER, cx);
AutoMarkingNativeInterfacePtr iface(ccx);
iface = XPCNativeInterface::GetNewOrUsed(mInfo);
if (!iface)
return NS_OK;
XPCNativeMember* member = iface->FindMember(id);
if (member && member->IsConstant()) {
RootedValue val(cx);
if (!member->GetConstantValue(ccx, iface, val.address()))
return NS_ERROR_OUT_OF_MEMORY;
*resolvedp = true;
*_retval = JS_DefinePropertyById(cx, obj, id, val,
JSPROP_ENUMERATE | JSPROP_READONLY |
JSPROP_PERMANENT | JSPROP_RESOLVING);
}
return NS_OK;
}
NS_IMETHODIMP
nsJSIID::Enumerate(nsIXPConnectWrappedNative* wrapper,
JSContext * cx, JSObject * objArg, bool* _retval)
{
// In this case, let's just eagerly resolve...
RootedObject obj(cx, objArg);
XPCCallContext ccx(JS_CALLER, cx);
AutoMarkingNativeInterfacePtr iface(ccx);
iface = XPCNativeInterface::GetNewOrUsed(mInfo);
if (!iface)
return NS_OK;
uint16_t count = iface->GetMemberCount();
for (uint16_t i = 0; i < count; i++) {
XPCNativeMember* member = iface->GetMemberAt(i);
if (member && member->IsConstant() &&
!xpc_ForcePropertyResolve(cx, obj, member->GetName())) {
return NS_ERROR_UNEXPECTED;
}
}
return NS_OK;
}
/*
* HasInstance hooks need to find an appropriate reflector in order to function
* properly. There are two complexities that we need to handle:
*
* 1 - Cross-compartment wrappers. Chrome uses over 100 compartments, all with
* system principal. The success of an instanceof check should not depend
* on which compartment an object comes from. At the same time, we want to
* make sure we don't unwrap important security wrappers.
* CheckedUnwrap does the right thing here.
*
* 2 - Prototype chains. Suppose someone creates a vanilla JS object |a| and
* sets its __proto__ to some WN |b|. If |b instanceof nsIFoo| returns true,
* one would expect |a instanceof nsIFoo| to return true as well, since
* instanceof is transitive up the prototype chain in ECMAScript. Moreover,
* there's chrome code that relies on this.
*
* This static method handles both complexities, returning either an XPCWN, a
* DOM object, or null. The object may well be cross-compartment from |cx|.
*/
static JSObject*
FindObjectForHasInstance(JSContext* cx, HandleObject objArg)
{
RootedObject obj(cx, objArg), proto(cx);
while (obj && !IS_WN_REFLECTOR(obj) &&
!IsDOMObject(obj) && !mozilla::jsipc::IsCPOW(obj))
{
if (js::IsWrapper(obj)) {
obj = js::CheckedUnwrap(obj, /* stopAtWindowProxy = */ false);
continue;
}
if (!js::GetObjectProto(cx, obj, &proto))
return nullptr;
obj = proto;
}
return obj;
}
nsresult
xpc::HasInstance(JSContext* cx, HandleObject objArg, const nsID* iid, bool* bp)
{
*bp = false;
RootedObject obj(cx, FindObjectForHasInstance(cx, objArg));
if (!obj)
return NS_OK;
if (mozilla::jsipc::IsCPOW(obj))
return mozilla::jsipc::InstanceOf(obj, iid, bp);
nsISupports* identity = UnwrapReflectorToISupports(obj);
if (!identity)
return NS_OK;
nsCOMPtr<nsISupports> supp;
identity->QueryInterface(*iid, getter_AddRefs(supp));
*bp = supp;
// Our old HasInstance implementation operated by invoking FindTearOff on
// XPCWrappedNatives, and various bits of chrome JS came to depend on
// |instanceof| doing an implicit QI if it succeeds. Do a drive-by QI to
// preserve that behavior. This is just a compatibility hack, so we don't
// really care if it fails.
if (IS_WN_REFLECTOR(obj))
(void) XPCWrappedNative::Get(obj)->FindTearOff(*iid);
return NS_OK;
}
NS_IMETHODIMP
nsJSIID::HasInstance(nsIXPConnectWrappedNative* wrapper,
JSContext* cx, JSObject * /* unused */,
HandleValue val, bool* bp, bool* _retval)
{
*bp = false;
if (val.isPrimitive())
return NS_OK;
// we have a JSObject
RootedObject obj(cx, &val.toObject());
const nsIID* iid;
mInfo->GetIIDShared(&iid);
return xpc::HasInstance(cx, obj, iid, bp);
}
/***************************************************************************/
NS_INTERFACE_MAP_BEGIN(nsJSCID)
NS_INTERFACE_MAP_ENTRY(nsIJSID)
NS_INTERFACE_MAP_ENTRY(nsIJSCID)
NS_INTERFACE_MAP_ENTRY(nsIXPCScriptable)
NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIJSID)
NS_IMPL_QUERY_CLASSINFO(nsJSCID)
NS_INTERFACE_MAP_END
NS_IMPL_ADDREF(nsJSCID)
NS_IMPL_RELEASE(nsJSCID)
NS_IMPL_CI_INTERFACE_GETTER(nsJSCID, nsIJSID, nsIJSCID)
// The nsIXPCScriptable map declaration that will generate stubs for us...
#define XPC_MAP_CLASSNAME nsJSCID
#define XPC_MAP_QUOTED_CLASSNAME "nsJSCID"
#define XPC_MAP_WANT_CONSTRUCT
#define XPC_MAP_WANT_HASINSTANCE
#define XPC_MAP_FLAGS 0
#include "xpc_map_end.h" /* This will #undef the above */
nsJSCID::nsJSCID() { mDetails = new nsJSID(); }
nsJSCID::~nsJSCID() {}
NS_IMETHODIMP nsJSCID::GetName(char * *aName)
{ResolveName(); return mDetails->GetName(aName);}
NS_IMETHODIMP nsJSCID::GetNumber(char * *aNumber)
{return mDetails->GetNumber(aNumber);}
NS_IMETHODIMP_(const nsID*) nsJSCID::GetID()
{return &mDetails->ID();}
NS_IMETHODIMP nsJSCID::GetValid(bool* aValid)
{return mDetails->GetValid(aValid);}
NS_IMETHODIMP nsJSCID::Equals(nsIJSID* other, bool* _retval)
{return mDetails->Equals(other, _retval);}
NS_IMETHODIMP nsJSCID::Initialize(const char* idString)
{return mDetails->Initialize(idString);}
NS_IMETHODIMP nsJSCID::ToString(char** _retval)
{ResolveName(); return mDetails->ToString(_retval);}
void
nsJSCID::ResolveName()
{
if (!mDetails->NameIsSet())
mDetails->SetNameToNoString();
}
//static
already_AddRefed<nsJSCID>
nsJSCID::NewID(const char* str)
{
if (!str) {
NS_ERROR("no string");
return nullptr;
}
RefPtr<nsJSCID> idObj = new nsJSCID();
if (str[0] == '{') {
NS_ENSURE_SUCCESS(idObj->Initialize(str), nullptr);
} else {
nsCOMPtr<nsIComponentRegistrar> registrar;
NS_GetComponentRegistrar(getter_AddRefs(registrar));
NS_ENSURE_TRUE(registrar, nullptr);
nsCID* cid;
if (NS_FAILED(registrar->ContractIDToCID(str, &cid)))
return nullptr;
bool success = idObj->mDetails->InitWithName(*cid, str);
free(cid);
if (!success)
return nullptr;
}
return idObj.forget();
}
static const nsID*
GetIIDArg(uint32_t argc, const JS::Value& val, JSContext* cx)
{
const nsID* iid;
// If an IID was passed in then use it
if (argc) {
JSObject* iidobj;
if (val.isPrimitive() ||
!(iidobj = val.toObjectOrNull()) ||
!(iid = xpc_JSObjectToID(cx, iidobj))) {
return nullptr;
}
} else
iid = &NS_GET_IID(nsISupports);
return iid;
}
NS_IMETHODIMP
nsJSCID::CreateInstance(HandleValue iidval, JSContext* cx,
uint8_t optionalArgc, MutableHandleValue retval)
{
if (!mDetails->IsValid())
return NS_ERROR_XPC_BAD_CID;
if (NS_FAILED(nsXPConnect::SecurityManager()->CanCreateInstance(cx, mDetails->ID()))) {
NS_ERROR("how are we not being called from chrome here?");
return NS_OK;
}
// If an IID was passed in then use it
const nsID* iid = GetIIDArg(optionalArgc, iidval, cx);
if (!iid)
return NS_ERROR_XPC_BAD_IID;
nsCOMPtr<nsIComponentManager> compMgr;
nsresult rv = NS_GetComponentManager(getter_AddRefs(compMgr));
if (NS_FAILED(rv))
return NS_ERROR_UNEXPECTED;
nsCOMPtr<nsISupports> inst;
rv = compMgr->CreateInstance(mDetails->ID(), nullptr, *iid, getter_AddRefs(inst));
MOZ_ASSERT(NS_FAILED(rv) || inst, "component manager returned success, but instance is null!");
if (NS_FAILED(rv) || !inst)
return NS_ERROR_XPC_CI_RETURNED_FAILURE;
rv = nsContentUtils::WrapNative(cx, inst, iid, retval);
if (NS_FAILED(rv) || retval.isPrimitive())
return NS_ERROR_XPC_CANT_CREATE_WN;
return NS_OK;
}
NS_IMETHODIMP
nsJSCID::GetService(HandleValue iidval, JSContext* cx, uint8_t optionalArgc,
MutableHandleValue retval)
{
if (!mDetails->IsValid())
return NS_ERROR_XPC_BAD_CID;
if (NS_FAILED(nsXPConnect::SecurityManager()->CanCreateInstance(cx, mDetails->ID()))) {
MOZ_ASSERT(JS_IsExceptionPending(cx),
"security manager vetoed GetService without setting exception");
return NS_OK;
}
// If an IID was passed in then use it
const nsID* iid = GetIIDArg(optionalArgc, iidval, cx);
if (!iid)
return NS_ERROR_XPC_BAD_IID;
nsCOMPtr<nsIServiceManager> svcMgr;
nsresult rv = NS_GetServiceManager(getter_AddRefs(svcMgr));
if (NS_FAILED(rv))
return rv;
nsCOMPtr<nsISupports> srvc;
rv = svcMgr->GetService(mDetails->ID(), *iid, getter_AddRefs(srvc));
MOZ_ASSERT(NS_FAILED(rv) || srvc, "service manager returned success, but service is null!");
if (NS_FAILED(rv) || !srvc)
return NS_ERROR_XPC_GS_RETURNED_FAILURE;
RootedValue v(cx);
rv = nsContentUtils::WrapNative(cx, srvc, iid, &v);
if (NS_FAILED(rv) || !v.isObject())
return NS_ERROR_XPC_CANT_CREATE_WN;
retval.set(v);
return NS_OK;
}
NS_IMETHODIMP
nsJSCID::Construct(nsIXPConnectWrappedNative* wrapper,
JSContext* cx, JSObject* objArg,
const CallArgs& args, bool* _retval)
{
RootedObject obj(cx, objArg);
XPCJSRuntime* rt = nsXPConnect::GetRuntimeInstance();
if (!rt)
return NS_ERROR_FAILURE;
// 'push' a call context and call on it
RootedId name(cx, rt->GetStringID(XPCJSRuntime::IDX_CREATE_INSTANCE));
XPCCallContext ccx(JS_CALLER, cx, obj, nullptr, name, args.length(), args.array(),
args.rval().address());
*_retval = XPCWrappedNative::CallMethod(ccx);
return NS_OK;
}
NS_IMETHODIMP
nsJSCID::HasInstance(nsIXPConnectWrappedNative* wrapper,
JSContext* cx, JSObject * /* unused */,
HandleValue val, bool* bp, bool* _retval)
{
*bp = false;
nsresult rv = NS_OK;
if (val.isObject()) {
// we have a JSObject
RootedObject obj(cx, &val.toObject());
MOZ_ASSERT(obj, "when is an object not an object?");
// is this really a native xpcom object with a wrapper?
nsIClassInfo* ci = nullptr;
obj = FindObjectForHasInstance(cx, obj);
if (!obj || !IS_WN_REFLECTOR(obj))
return rv;
if (XPCWrappedNative* other_wrapper = XPCWrappedNative::Get(obj))
ci = other_wrapper->GetClassInfo();
// We consider CID equality to be the thing that matters here.
// This is perhaps debatable.
if (ci) {
nsID cid;
if (NS_SUCCEEDED(ci->GetClassIDNoAlloc(&cid)))
*bp = cid.Equals(mDetails->ID());
}
}
return rv;
}
/***************************************************************************/
// additional utilities...
JSObject*
xpc_NewIDObject(JSContext* cx, HandleObject jsobj, const nsID& aID)
{
RootedObject obj(cx);
nsCOMPtr<nsIJSID> iid = nsJSID::NewID(aID);
if (iid) {
nsXPConnect* xpc = nsXPConnect::XPConnect();
if (xpc) {
xpc->WrapNative(cx, jsobj, static_cast<nsISupports*>(iid),
NS_GET_IID(nsIJSID), obj.address());
}
}
return obj;
}
// note: returned pointer is only valid while |obj| remains alive!
const nsID*
xpc_JSObjectToID(JSContext* cx, JSObject* obj)
{
if (!cx || !obj)
return nullptr;
// NOTE: this call does NOT addref
XPCWrappedNative* wrapper = nullptr;
obj = js::CheckedUnwrap(obj);
if (obj && IS_WN_REFLECTOR(obj))
wrapper = XPCWrappedNative::Get(obj);
if (wrapper &&
(wrapper->HasInterfaceNoQI(NS_GET_IID(nsIJSID)) ||
wrapper->HasInterfaceNoQI(NS_GET_IID(nsIJSIID)) ||
wrapper->HasInterfaceNoQI(NS_GET_IID(nsIJSCID)))) {
return ((nsIJSID*)wrapper->GetIdentityObject())->GetID();
}
return nullptr;
}
bool
xpc_JSObjectIsID(JSContext* cx, JSObject* obj)
{
MOZ_ASSERT(cx && obj, "bad param");
// NOTE: this call does NOT addref
XPCWrappedNative* wrapper = nullptr;
obj = js::CheckedUnwrap(obj);
if (obj && IS_WN_REFLECTOR(obj))
wrapper = XPCWrappedNative::Get(obj);
return wrapper &&
(wrapper->HasInterfaceNoQI(NS_GET_IID(nsIJSID)) ||
wrapper->HasInterfaceNoQI(NS_GET_IID(nsIJSIID)) ||
wrapper->HasInterfaceNoQI(NS_GET_IID(nsIJSCID)));
}
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