gecko-dev/dom/base/nsScriptNameSpaceManager.cpp
Peter Van der Beken 517988bd1b Fix for bug 484764 (Set up DOM prototype chains from PostCreateProto instead of PostCreate). r/sr=jst.
--HG--
extra : rebase_source : 8e24cbcede7e48e42c4c06a55d3bc7dd91603020
2009-06-03 17:30:18 +02:00

705 lines
22 KiB
C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Mozilla Communicator client code.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#include "nsScriptNameSpaceManager.h"
#include "nsCOMPtr.h"
#include "nsIComponentManager.h"
#include "nsIComponentRegistrar.h"
#include "nsICategoryManager.h"
#include "nsIServiceManager.h"
#include "nsXPCOM.h"
#include "nsISupportsPrimitives.h"
#include "nsIScriptExternalNameSet.h"
#include "nsIScriptNameSpaceManager.h"
#include "nsIScriptContext.h"
#include "nsIInterfaceInfoManager.h"
#include "nsIInterfaceInfo.h"
#include "xptinfo.h"
#include "nsXPIDLString.h"
#include "nsReadableUtils.h"
#include "nsHashKeys.h"
#include "nsDOMClassInfo.h"
#include "nsCRT.h"
#define NS_INTERFACE_PREFIX "nsI"
#define NS_DOM_INTERFACE_PREFIX "nsIDOM"
// Our extended PLDHashEntryHdr
class GlobalNameMapEntry : public PLDHashEntryHdr
{
public:
// Our hash table ops don't care about the order of these members
nsString mKey;
nsGlobalNameStruct mGlobalName;
};
static PLDHashNumber
GlobalNameHashHashKey(PLDHashTable *table, const void *key)
{
const nsAString *str = static_cast<const nsAString *>(key);
return HashString(*str);
}
static PRBool
GlobalNameHashMatchEntry(PLDHashTable *table, const PLDHashEntryHdr *entry,
const void *key)
{
const GlobalNameMapEntry *e =
static_cast<const GlobalNameMapEntry *>(entry);
const nsAString *str = static_cast<const nsAString *>(key);
return str->Equals(e->mKey);
}
static void
GlobalNameHashClearEntry(PLDHashTable *table, PLDHashEntryHdr *entry)
{
GlobalNameMapEntry *e = static_cast<GlobalNameMapEntry *>(entry);
// An entry is being cleared, let the key (nsString) do its own
// cleanup.
e->mKey.~nsString();
if (e->mGlobalName.mType == nsGlobalNameStruct::eTypeExternalClassInfo) {
nsIClassInfo* ci = GET_CLEAN_CI_PTR(e->mGlobalName.mData->mCachedClassInfo);
// If we constructed an internal helper, we'll let the helper delete
// the nsDOMClassInfoData structure, if not we do it here.
if (!ci || e->mGlobalName.mData->u.mExternalConstructorFptr) {
delete e->mGlobalName.mData;
}
// Release our pointer to the helper.
NS_IF_RELEASE(ci);
}
else if (e->mGlobalName.mType == nsGlobalNameStruct::eTypeExternalConstructorAlias) {
delete e->mGlobalName.mAlias;
}
// This will set e->mGlobalName.mType to
// nsGlobalNameStruct::eTypeNotInitialized
memset(&e->mGlobalName, 0, sizeof(nsGlobalNameStruct));
}
static PRBool
GlobalNameHashInitEntry(PLDHashTable *table, PLDHashEntryHdr *entry,
const void *key)
{
GlobalNameMapEntry *e = static_cast<GlobalNameMapEntry *>(entry);
const nsAString *keyStr = static_cast<const nsAString *>(key);
// Initialize the key in the entry with placement new
new (&e->mKey) nsString(*keyStr);
// This will set e->mGlobalName.mType to
// nsGlobalNameStruct::eTypeNotInitialized
memset(&e->mGlobalName, 0, sizeof(nsGlobalNameStruct));
return PR_TRUE;
}
nsScriptNameSpaceManager::nsScriptNameSpaceManager()
: mIsInitialized(PR_FALSE)
{
MOZ_COUNT_CTOR(nsScriptNameSpaceManager);
}
nsScriptNameSpaceManager::~nsScriptNameSpaceManager()
{
if (mIsInitialized) {
// Destroy the hash
PL_DHashTableFinish(&mGlobalNames);
}
MOZ_COUNT_DTOR(nsScriptNameSpaceManager);
}
nsGlobalNameStruct *
nsScriptNameSpaceManager::AddToHash(const char *aKey,
const PRUnichar **aClassName)
{
NS_ConvertASCIItoUTF16 key(aKey);
GlobalNameMapEntry *entry =
static_cast<GlobalNameMapEntry *>
(PL_DHashTableOperate(&mGlobalNames, &key, PL_DHASH_ADD));
if (!entry) {
return nsnull;
}
if (aClassName) {
*aClassName = entry->mKey.get();
}
return &entry->mGlobalName;
}
nsGlobalNameStruct*
nsScriptNameSpaceManager::GetConstructorProto(const nsGlobalNameStruct* aStruct)
{
NS_ASSERTION(aStruct->mType == nsGlobalNameStruct::eTypeExternalConstructorAlias,
"This function only works on constructor aliases!");
if (!aStruct->mAlias->mProto) {
GlobalNameMapEntry *proto =
static_cast<GlobalNameMapEntry *>
(PL_DHashTableOperate(&mGlobalNames,
&aStruct->mAlias->mProtoName,
PL_DHASH_LOOKUP));
if (PL_DHASH_ENTRY_IS_BUSY(proto)) {
aStruct->mAlias->mProto = &proto->mGlobalName;
}
}
return aStruct->mAlias->mProto;
}
nsresult
nsScriptNameSpaceManager::FillHash(nsICategoryManager *aCategoryManager,
const char *aCategory,
nsGlobalNameStruct::nametype aType,
PRBool aPrivilegedOnly)
{
nsCOMPtr<nsIComponentRegistrar> registrar;
nsresult rv = NS_GetComponentRegistrar(getter_AddRefs(registrar));
NS_ENSURE_SUCCESS(rv, rv);
nsCOMPtr<nsISimpleEnumerator> e;
rv = aCategoryManager->EnumerateCategory(aCategory, getter_AddRefs(e));
NS_ENSURE_SUCCESS(rv, rv);
nsCAutoString categoryEntry;
nsXPIDLCString contractId;
nsCOMPtr<nsISupports> entry;
while (NS_SUCCEEDED(e->GetNext(getter_AddRefs(entry)))) {
nsCOMPtr<nsISupportsCString> category(do_QueryInterface(entry));
if (!category) {
NS_WARNING("Category entry not an nsISupportsCString!");
continue;
}
rv = category->GetData(categoryEntry);
NS_ENSURE_SUCCESS(rv, rv);
rv = aCategoryManager->GetCategoryEntry(aCategory, categoryEntry.get(),
getter_Copies(contractId));
NS_ENSURE_SUCCESS(rv, rv);
nsCID *cidPtr;
rv = registrar->ContractIDToCID(contractId, &cidPtr);
if (NS_FAILED(rv)) {
NS_WARNING("Bad contract id registed with the script namespace manager");
continue;
}
// Copy CID onto the stack, so we can free it right away and avoid having
// to add cleanup code at every exit point from this loop/function.
nsCID cid = *cidPtr;
nsMemory::Free(cidPtr);
if (aType == nsGlobalNameStruct::eTypeExternalConstructor) {
nsXPIDLCString constructorProto;
rv = aCategoryManager->GetCategoryEntry(JAVASCRIPT_GLOBAL_CONSTRUCTOR_PROTO_ALIAS_CATEGORY,
categoryEntry.get(),
getter_Copies(constructorProto));
if (NS_SUCCEEDED(rv)) {
nsGlobalNameStruct *s = AddToHash(categoryEntry.get());
NS_ENSURE_TRUE(s, NS_ERROR_OUT_OF_MEMORY);
if (s->mType == nsGlobalNameStruct::eTypeNotInitialized) {
s->mAlias = new nsGlobalNameStruct::ConstructorAlias;
if (!s->mAlias) {
// Free entry
NS_ConvertASCIItoUTF16 key(categoryEntry);
PL_DHashTableOperate(&mGlobalNames,
&key,
PL_DHASH_REMOVE);
return NS_ERROR_OUT_OF_MEMORY;
}
s->mType = nsGlobalNameStruct::eTypeExternalConstructorAlias;
s->mPrivilegedOnly = PR_FALSE;
s->mAlias->mCID = cid;
AppendASCIItoUTF16(constructorProto, s->mAlias->mProtoName);
s->mAlias->mProto = nsnull;
} else {
NS_WARNING("Global script name not overwritten!");
}
continue;
}
}
nsGlobalNameStruct *s = AddToHash(categoryEntry.get());
NS_ENSURE_TRUE(s, NS_ERROR_OUT_OF_MEMORY);
if (s->mType == nsGlobalNameStruct::eTypeNotInitialized) {
s->mType = aType;
s->mCID = cid;
s->mPrivilegedOnly = aPrivilegedOnly;
} else {
NS_WARNING("Global script name not overwritten!");
}
}
return NS_OK;
}
// This method enumerates over all installed interfaces (in .xpt
// files) and finds ones that start with "nsIDOM" and has constants
// defined in the interface itself (inherited constants doesn't
// count), once such an interface is found the "nsIDOM" prefix is cut
// off the name and the rest of the name is added into the hash for
// global names. This makes things like 'Node.ELEMENT_NODE' work in
// JS. See nsWindowSH::GlobalResolve() for detais on how this is used.
nsresult
nsScriptNameSpaceManager::FillHashWithDOMInterfaces()
{
nsCOMPtr<nsIInterfaceInfoManager>
iim(do_GetService(NS_INTERFACEINFOMANAGER_SERVICE_CONTRACTID));
NS_ENSURE_TRUE(iim, NS_ERROR_UNEXPECTED);
// First look for all interfaces whose name starts with nsIDOM
nsCOMPtr<nsIEnumerator> domInterfaces;
nsresult rv =
iim->EnumerateInterfacesWhoseNamesStartWith(NS_DOM_INTERFACE_PREFIX,
getter_AddRefs(domInterfaces));
NS_ENSURE_SUCCESS(rv, rv);
nsCOMPtr<nsISupports> entry;
rv = domInterfaces->First();
if (NS_FAILED(rv)) {
// Empty interface list?
NS_WARNING("What, no nsIDOM interfaces installed?");
return NS_OK;
}
PRBool found_old;
nsCOMPtr<nsIInterfaceInfo> if_info;
const char *if_name = nsnull;
const nsIID *iid;
for ( ; domInterfaces->IsDone() == NS_ENUMERATOR_FALSE; domInterfaces->Next()) {
rv = domInterfaces->CurrentItem(getter_AddRefs(entry));
NS_ENSURE_SUCCESS(rv, rv);
nsCOMPtr<nsIInterfaceInfo> if_info(do_QueryInterface(entry));
if_info->GetNameShared(&if_name);
if_info->GetIIDShared(&iid);
rv = RegisterInterface(if_name + sizeof(NS_DOM_INTERFACE_PREFIX) - 1,
iid, &found_old);
#ifdef DEBUG
NS_ASSERTION(!found_old,
"Whaaa, interface name already in hash!");
#endif
}
// Next, look for externally registered DOM interfaces
rv = RegisterExternalInterfaces(PR_FALSE);
return rv;
}
nsresult
nsScriptNameSpaceManager::RegisterExternalInterfaces(PRBool aAsProto)
{
nsresult rv;
nsCOMPtr<nsICategoryManager> cm =
do_GetService(NS_CATEGORYMANAGER_CONTRACTID, &rv);
NS_ENSURE_SUCCESS(rv, rv);
nsCOMPtr<nsIInterfaceInfoManager>
iim(do_GetService(NS_INTERFACEINFOMANAGER_SERVICE_CONTRACTID));
NS_ENSURE_TRUE(iim, NS_ERROR_NOT_AVAILABLE);
nsCOMPtr<nsISimpleEnumerator> enumerator;
rv = cm->EnumerateCategory(JAVASCRIPT_DOM_INTERFACE,
getter_AddRefs(enumerator));
NS_ENSURE_SUCCESS(rv, rv);
nsXPIDLCString IID_string;
nsCAutoString category_entry;
const char* if_name;
nsCOMPtr<nsISupports> entry;
nsCOMPtr<nsIInterfaceInfo> if_info;
PRBool found_old, dom_prefix;
while (NS_SUCCEEDED(enumerator->GetNext(getter_AddRefs(entry)))) {
nsCOMPtr<nsISupportsCString> category(do_QueryInterface(entry));
if (!category) {
NS_WARNING("Category entry not an nsISupportsCString!");
continue;
}
rv = category->GetData(category_entry);
NS_ENSURE_SUCCESS(rv, rv);
rv = cm->GetCategoryEntry(JAVASCRIPT_DOM_INTERFACE, category_entry.get(),
getter_Copies(IID_string));
NS_ENSURE_SUCCESS(rv, rv);
nsIID primary_IID;
if (!primary_IID.Parse(IID_string) ||
primary_IID.Equals(NS_GET_IID(nsISupports))) {
NS_ERROR("Invalid IID registered with the script namespace manager!");
continue;
}
iim->GetInfoForIID(&primary_IID, getter_AddRefs(if_info));
while (if_info) {
const nsIID *iid;
if_info->GetIIDShared(&iid);
NS_ENSURE_TRUE(iid, NS_ERROR_UNEXPECTED);
if (iid->Equals(NS_GET_IID(nsISupports))) {
break;
}
if_info->GetNameShared(&if_name);
dom_prefix = (strncmp(if_name, NS_DOM_INTERFACE_PREFIX,
sizeof(NS_DOM_INTERFACE_PREFIX) - 1) == 0);
const char* name;
if (dom_prefix) {
if (!aAsProto) {
// nsIDOM* interfaces have already been registered.
break;
}
name = if_name + sizeof(NS_DOM_INTERFACE_PREFIX) - 1;
} else {
name = if_name + sizeof(NS_INTERFACE_PREFIX) - 1;
}
if (aAsProto) {
RegisterClassProto(name, iid, &found_old);
} else {
RegisterInterface(name, iid, &found_old);
}
if (found_old) {
break;
}
nsCOMPtr<nsIInterfaceInfo> tmp(if_info);
tmp->GetParent(getter_AddRefs(if_info));
}
}
return NS_OK;
}
nsresult
nsScriptNameSpaceManager::RegisterInterface(const char* aIfName,
const nsIID *aIfIID,
PRBool* aFoundOld)
{
*aFoundOld = PR_FALSE;
nsGlobalNameStruct *s = AddToHash(aIfName);
NS_ENSURE_TRUE(s, NS_ERROR_OUT_OF_MEMORY);
if (s->mType != nsGlobalNameStruct::eTypeNotInitialized) {
*aFoundOld = PR_TRUE;
return NS_OK;
}
s->mType = nsGlobalNameStruct::eTypeInterface;
s->mIID = *aIfIID;
return NS_OK;
}
#define GLOBALNAME_HASHTABLE_INITIAL_SIZE 1024
nsresult
nsScriptNameSpaceManager::Init()
{
static PLDHashTableOps hash_table_ops =
{
PL_DHashAllocTable,
PL_DHashFreeTable,
GlobalNameHashHashKey,
GlobalNameHashMatchEntry,
PL_DHashMoveEntryStub,
GlobalNameHashClearEntry,
PL_DHashFinalizeStub,
GlobalNameHashInitEntry
};
mIsInitialized = PL_DHashTableInit(&mGlobalNames, &hash_table_ops, nsnull,
sizeof(GlobalNameMapEntry),
GLOBALNAME_HASHTABLE_INITIAL_SIZE);
NS_ENSURE_TRUE(mIsInitialized, NS_ERROR_OUT_OF_MEMORY);
nsresult rv = NS_OK;
rv = FillHashWithDOMInterfaces();
NS_ENSURE_SUCCESS(rv, rv);
nsCOMPtr<nsICategoryManager> cm =
do_GetService(NS_CATEGORYMANAGER_CONTRACTID, &rv);
NS_ENSURE_SUCCESS(rv, rv);
rv = FillHash(cm, JAVASCRIPT_GLOBAL_CONSTRUCTOR_CATEGORY,
nsGlobalNameStruct::eTypeExternalConstructor, PR_FALSE);
NS_ENSURE_SUCCESS(rv, rv);
rv = FillHash(cm, JAVASCRIPT_GLOBAL_PROPERTY_CATEGORY,
nsGlobalNameStruct::eTypeProperty, PR_FALSE);
NS_ENSURE_SUCCESS(rv, rv);
rv = FillHash(cm, JAVASCRIPT_GLOBAL_PRIVILEGED_PROPERTY_CATEGORY,
nsGlobalNameStruct::eTypeProperty, PR_TRUE);
NS_ENSURE_SUCCESS(rv, rv);
rv = FillHash(cm, JAVASCRIPT_GLOBAL_STATIC_NAMESET_CATEGORY,
nsGlobalNameStruct::eTypeStaticNameSet, PR_FALSE);
NS_ENSURE_SUCCESS(rv, rv);
rv = FillHash(cm, JAVASCRIPT_GLOBAL_DYNAMIC_NAMESET_CATEGORY,
nsGlobalNameStruct::eTypeDynamicNameSet, PR_FALSE);
NS_ENSURE_SUCCESS(rv, rv);
return NS_OK;
}
struct NameSetClosure {
nsIScriptContext* ctx;
nsresult rv;
};
static PLDHashOperator
NameSetInitCallback(PLDHashTable *table, PLDHashEntryHdr *hdr,
PRUint32 number, void *arg)
{
GlobalNameMapEntry *entry = static_cast<GlobalNameMapEntry *>(hdr);
if (entry->mGlobalName.mType == nsGlobalNameStruct::eTypeStaticNameSet) {
nsresult rv = NS_OK;
nsCOMPtr<nsIScriptExternalNameSet> ns =
do_CreateInstance(entry->mGlobalName.mCID, &rv);
NS_ENSURE_SUCCESS(rv, PL_DHASH_NEXT);
NameSetClosure *closure = static_cast<NameSetClosure *>(arg);
closure->rv = ns->InitializeNameSet(closure->ctx);
if (NS_FAILED(closure->rv)) {
NS_ERROR("Initing external script classes failed!");
return PL_DHASH_STOP;
}
}
return PL_DHASH_NEXT;
}
nsresult
nsScriptNameSpaceManager::InitForContext(nsIScriptContext *aContext)
{
NameSetClosure closure;
closure.ctx = aContext;
closure.rv = NS_OK;
PL_DHashTableEnumerate(&mGlobalNames, NameSetInitCallback, &closure);
return closure.rv;
}
nsresult
nsScriptNameSpaceManager::LookupName(const nsAString& aName,
const nsGlobalNameStruct **aNameStruct,
const PRUnichar **aClassName)
{
GlobalNameMapEntry *entry =
static_cast<GlobalNameMapEntry *>
(PL_DHashTableOperate(&mGlobalNames, &aName,
PL_DHASH_LOOKUP));
if (PL_DHASH_ENTRY_IS_BUSY(entry)) {
*aNameStruct = &entry->mGlobalName;
if (aClassName) {
*aClassName = entry->mKey.get();
}
} else {
*aNameStruct = nsnull;
if (aClassName) {
*aClassName = nsnull;
}
}
return NS_OK;
}
nsresult
nsScriptNameSpaceManager::RegisterClassName(const char *aClassName,
PRInt32 aDOMClassInfoID,
const PRUnichar **aResult)
{
if (!nsCRT::IsAscii(aClassName)) {
NS_ERROR("Trying to register a non-ASCII class name");
return NS_OK;
}
nsGlobalNameStruct *s = AddToHash(aClassName, aResult);
NS_ENSURE_TRUE(s, NS_ERROR_OUT_OF_MEMORY);
if (s->mType == nsGlobalNameStruct::eTypeClassConstructor) {
return NS_OK;
}
// If a external constructor is already defined with aClassName we
// won't overwrite it.
if (s->mType == nsGlobalNameStruct::eTypeExternalConstructor) {
return NS_OK;
}
NS_ASSERTION(s->mType == nsGlobalNameStruct::eTypeNotInitialized ||
s->mType == nsGlobalNameStruct::eTypeInterface,
"Whaaa, JS environment name clash!");
s->mType = nsGlobalNameStruct::eTypeClassConstructor;
s->mDOMClassInfoID = aDOMClassInfoID;
return NS_OK;
}
nsresult
nsScriptNameSpaceManager::RegisterClassProto(const char *aClassName,
const nsIID *aConstructorProtoIID,
PRBool *aFoundOld)
{
NS_ENSURE_ARG_POINTER(aConstructorProtoIID);
*aFoundOld = PR_FALSE;
nsGlobalNameStruct *s = AddToHash(aClassName);
NS_ENSURE_TRUE(s, NS_ERROR_OUT_OF_MEMORY);
if (s->mType != nsGlobalNameStruct::eTypeNotInitialized &&
s->mType != nsGlobalNameStruct::eTypeInterface) {
*aFoundOld = PR_TRUE;
return NS_OK;
}
s->mType = nsGlobalNameStruct::eTypeClassProto;
s->mIID = *aConstructorProtoIID;
return NS_OK;
}
nsresult
nsScriptNameSpaceManager::RegisterExternalClassName(const char *aClassName,
nsCID& aCID)
{
nsGlobalNameStruct *s = AddToHash(aClassName);
NS_ENSURE_TRUE(s, NS_ERROR_OUT_OF_MEMORY);
// If an external constructor is already defined with aClassName we
// won't overwrite it.
if (s->mType == nsGlobalNameStruct::eTypeExternalConstructor) {
return NS_OK;
}
NS_ASSERTION(s->mType == nsGlobalNameStruct::eTypeNotInitialized ||
s->mType == nsGlobalNameStruct::eTypeInterface,
"Whaaa, JS environment name clash!");
s->mType = nsGlobalNameStruct::eTypeExternalClassInfoCreator;
s->mCID = aCID;
return NS_OK;
}
nsresult
nsScriptNameSpaceManager::RegisterDOMCIData(const char *aName,
nsDOMClassInfoExternalConstructorFnc aConstructorFptr,
const nsIID *aProtoChainInterface,
const nsIID **aInterfaces,
PRUint32 aScriptableFlags,
PRBool aHasClassInterface,
const nsCID *aConstructorCID)
{
const PRUnichar* className;
nsGlobalNameStruct *s = AddToHash(aName, &className);
NS_ENSURE_TRUE(s, NS_ERROR_OUT_OF_MEMORY);
// If an external constructor is already defined with aClassName we
// won't overwrite it.
if (s->mType == nsGlobalNameStruct::eTypeClassConstructor ||
s->mType == nsGlobalNameStruct::eTypeExternalClassInfo) {
return NS_OK;
}
// XXX Should we bail out here?
NS_ASSERTION(s->mType == nsGlobalNameStruct::eTypeNotInitialized ||
s->mType == nsGlobalNameStruct::eTypeExternalClassInfoCreator,
"Someone tries to register classinfo data for a class that isn't new or external!");
s->mData = new nsExternalDOMClassInfoData;
NS_ENSURE_TRUE(s->mData, NS_ERROR_OUT_OF_MEMORY);
s->mType = nsGlobalNameStruct::eTypeExternalClassInfo;
s->mData->mName = aName;
s->mData->mNameUTF16 = className;
if (aConstructorFptr)
s->mData->u.mExternalConstructorFptr = aConstructorFptr;
else
// null constructor will cause us to use nsDOMGenericSH::doCreate
s->mData->u.mExternalConstructorFptr = nsnull;
s->mData->mCachedClassInfo = nsnull;
s->mData->mProtoChainInterface = aProtoChainInterface;
s->mData->mInterfaces = aInterfaces;
s->mData->mScriptableFlags = aScriptableFlags;
s->mData->mHasClassInterface = aHasClassInterface;
s->mData->mConstructorCID = aConstructorCID;
return NS_OK;
}