void
nsXPCWrappedJS::Unlink()
{
if (IsValid()) {
XPCJSRuntime* rt = nsXPConnect::GetRuntimeInstance();
if (rt) {
if (mRoot == this) {
// remove this root wrapper from the map
JSObject2WrappedJSMap* map = rt->GetWrappedJSMap();
if (map) {
XPCAutoLock lock(rt->GetMapLock());
map->Remove(this);
}
}
if (mRefCnt > 1)
RemoveFromRootSet(rt->GetMapLock());
}
mJSObj = nsnull;
}
if (mRoot == this) {
ClearWeakReferences();
} else if (mRoot) {
// unlink this wrapper
nsXPCWrappedJS* cur = mRoot;
while (1) {
if (cur->mNext == this) {
cur->mNext = mNext;
break;
}
cur = cur->mNext;
NS_ASSERTION(cur, "failed to find wrapper in its own chain");
}
// let the root go
NS_RELEASE(mRoot);
}
NS_IF_RELEASE(mClass);
if (mOuter) {
XPCJSRuntime* rt = nsXPConnect::GetRuntimeInstance();
if (rt->GetThreadRunningGC()) {
rt->DeferredRelease(mOuter);
mOuter = nsnull;
} else {
NS_RELEASE(mOuter);
}
}
}
nsrefcnt
nsXPCWrappedJS::Release(void)
{
if (!MOZ_LIKELY(NS_IsMainThread() || NS_IsCycleCollectorThread()))
MOZ_CRASH();
NS_PRECONDITION(0 != mRefCnt, "dup release");
if (mMainThreadOnly && !NS_IsMainThread()) {
// We'd like to abort here, but this can happen if someone uses a proxy
// for the nsXPCWrappedJS.
nsCOMPtr<nsIThread> mainThread = do_GetMainThread();
// If we can't get the main thread anymore we just leak, but this really
// shouldn't happen.
NS_ASSERTION(mainThread,
"Can't get main thread, leaking nsXPCWrappedJS!");
if (mainThread) {
NS_ProxyRelease(mainThread,
static_cast<nsIXPConnectWrappedJS*>(this));
}
return mRefCnt;
}
// need to take the map lock here to prevent GetNewOrUsed from trying
// to reuse a wrapper on one thread while it's being destroyed on another
XPCJSRuntime* rt = nsXPConnect::GetRuntimeInstance();
XPCAutoLock lock(rt->GetMapLock());
do_decrement:
nsrefcnt cnt = --mRefCnt;
NS_LOG_RELEASE(this, cnt, "nsXPCWrappedJS");
if (0 == cnt) {
delete this; // also unlinks us from chain
return 0;
}
if (1 == cnt) {
if (IsValid())
RemoveFromRootSet(rt->GetMapLock());
// If we are not the root wrapper or if we are not being used from a
// weak reference, then this extra ref is not needed and we can let
// ourself be deleted.
// Note: HasWeakReferences() could only return true for the root.
if (!HasWeakReferences())
goto do_decrement;
}
return cnt;
}
// static
XPCNativeSet*
XPCNativeSet::GetNewOrUsed(XPCCallContext& ccx, const nsIID* iid)
{
AutoMarkingNativeSetPtr set(ccx);
AutoMarkingNativeInterfacePtr iface(ccx);
iface = XPCNativeInterface::GetNewOrUsed(ccx, iid);
if(!iface)
return nsnull;
XPCNativeSetKey key(nsnull, iface, 0);
XPCJSRuntime* rt = ccx.GetRuntime();
NativeSetMap* map = rt->GetNativeSetMap();
if(!map)
return nsnull;
{ // scoped lock
XPCAutoLock lock(rt->GetMapLock());
set = map->Find(&key);
}
if(set)
return set;
// hacky way to get a XPCNativeInterface** using the AutoPtr
XPCNativeInterface* temp[] = {iface};
set = NewInstance(ccx, temp, 1);
if(!set)
return nsnull;
{ // scoped lock
XPCAutoLock lock(rt->GetMapLock());
XPCNativeSet* set2 = map->Add(&key, set);
if(!set2)
{
NS_ERROR("failed to add our set!");
DestroyInstance(set);
set = nsnull;
}
else if(set2 != set)
{
DestroyInstance(set);
set = set2;
}
}
return set;
}
// static
XPCNativeSet*
XPCNativeSet::GetNewOrUsed(XPCCallContext& ccx,
XPCNativeSet* otherSet,
XPCNativeInterface* newInterface,
PRUint16 position)
{
AutoMarkingNativeSetPtr set(ccx);
XPCJSRuntime* rt = ccx.GetRuntime();
NativeSetMap* map = rt->GetNativeSetMap();
if(!map)
return nsnull;
XPCNativeSetKey key(otherSet, newInterface, position);
{ // scoped lock
XPCAutoLock lock(rt->GetMapLock());
set = map->Find(&key);
}
if(set)
return set;
if(otherSet)
set = NewInstanceMutate(otherSet, newInterface, position);
else
set = NewInstance(ccx, &newInterface, 1);
if(!set)
return nsnull;
{ // scoped lock
XPCAutoLock lock(rt->GetMapLock());
XPCNativeSet* set2 = map->Add(&key, set);
if(!set2)
{
NS_ERROR("failed to add our set!");
DestroyInstance(set);
set = nsnull;
}
else if(set2 != set)
{
DestroyInstance(set);
set = set2;
}
}
return set;
}
// static
XPCJSRuntime*
XPCJSRuntime::newXPCJSRuntime(nsXPConnect* aXPConnect,
nsIJSRuntimeService* aJSRuntimeService)
{
NS_PRECONDITION(aXPConnect,"bad param");
NS_PRECONDITION(aJSRuntimeService,"bad param");
XPCJSRuntime* self;
self = new XPCJSRuntime(aXPConnect,
aJSRuntimeService);
if(self &&
self->GetJSRuntime() &&
self->GetContextMap() &&
self->GetWrappedJSMap() &&
self->GetWrappedJSClassMap() &&
self->GetIID2NativeInterfaceMap() &&
self->GetClassInfo2NativeSetMap() &&
self->GetNativeSetMap() &&
self->GetThisTranslatorMap() &&
self->GetNativeScriptableSharedMap() &&
self->GetDyingWrappedNativeProtoMap() &&
self->GetExplicitNativeWrapperMap() &&
self->GetMapLock())
{
return self;
}
delete self;
return nsnull;
}
// static
XPCNativeInterface*
XPCNativeInterface::GetNewOrUsed(XPCCallContext& ccx, nsIInterfaceInfo* info)
{
AutoMarkingNativeInterfacePtr iface(ccx);
const nsIID* iid;
if(NS_FAILED(info->GetIIDShared(&iid)) || !iid)
return nsnull;
XPCJSRuntime* rt = ccx.GetRuntime();
IID2NativeInterfaceMap* map = rt->GetIID2NativeInterfaceMap();
if(!map)
return nsnull;
{ // scoped lock
XPCAutoLock lock(rt->GetMapLock());
iface = map->Find(*iid);
}
if(iface)
return iface;
iface = NewInstance(ccx, info);
if(!iface)
return nsnull;
{ // scoped lock
XPCAutoLock lock(rt->GetMapLock());
XPCNativeInterface* iface2 = map->Add(iface);
if(!iface2)
{
NS_ERROR("failed to add our interface!");
DestroyInstance(ccx, rt, iface);
iface = nsnull;
}
else if(iface2 != iface)
{
DestroyInstance(ccx, rt, iface);
iface = iface2;
}
}
return iface;
}
// static
XPCNativeInterface*
XPCNativeInterface::GetNewOrUsed(XPCCallContext& ccx, const nsIID* iid)
{
AutoMarkingNativeInterfacePtr iface(ccx);
XPCJSRuntime* rt = ccx.GetRuntime();
IID2NativeInterfaceMap* map = rt->GetIID2NativeInterfaceMap();
if(!map)
return nsnull;
{ // scoped lock
XPCAutoLock lock(rt->GetMapLock());
iface = map->Find(*iid);
}
if(iface)
return iface;
nsCOMPtr<nsIInterfaceInfo> info;
ccx.GetXPConnect()->GetInfoForIID(iid, getter_AddRefs(info));
if(!info)
return nsnull;
iface = NewInstance(ccx, info);
if(!iface)
return nsnull;
{ // scoped lock
XPCAutoLock lock(rt->GetMapLock());
XPCNativeInterface* iface2 = map->Add(iface);
if(!iface2)
{
NS_ERROR("failed to add our interface!");
DestroyInstance(ccx, rt, iface);
iface = nsnull;
}
else if(iface2 != iface)
{
DestroyInstance(ccx, rt, iface);
iface = iface2;
}
}
return iface;
}
// static
XPCNativeInterface*
XPCNativeInterface::GetNewOrUsed(const nsIID* iid)
{
AutoJSContext cx;
AutoMarkingNativeInterfacePtr iface(cx);
XPCJSRuntime* rt = XPCJSRuntime::Get();
IID2NativeInterfaceMap* map = rt->GetIID2NativeInterfaceMap();
if (!map)
return nullptr;
{ // scoped lock
XPCAutoLock lock(rt->GetMapLock());
iface = map->Find(*iid);
}
if (iface)
return iface;
nsCOMPtr<nsIInterfaceInfo> info;
XPTInterfaceInfoManager::GetSingleton()->GetInfoForIID(iid, getter_AddRefs(info));
if (!info)
return nullptr;
iface = NewInstance(info);
if (!iface)
return nullptr;
{ // scoped lock
XPCAutoLock lock(rt->GetMapLock());
XPCNativeInterface* iface2 = map->Add(iface);
if (!iface2) {
NS_ERROR("failed to add our interface!");
DestroyInstance(iface);
iface = nullptr;
} else if (iface2 != iface) {
DestroyInstance(iface);
iface = iface2;
}
}
return iface;
}
// static
void
XPCNativeSet::ClearCacheEntryForClassInfo(nsIClassInfo* classInfo)
{
XPCJSRuntime* rt = nsXPConnect::GetRuntimeInstance();
ClassInfo2NativeSetMap* map = rt->GetClassInfo2NativeSetMap();
if (map)
{ // scoped lock
XPCAutoLock lock(rt->GetMapLock());
map->Remove(classInfo);
}
}
// static
void
XPCWrappedNativeScope::FinishedFinalizationPhaseOfGC()
{
XPCJSRuntime* rt = nsXPConnect::GetRuntimeInstance();
// FIXME The lock may not be necessary since we are inside
// JSGC_FINALIZE_END callback and at this point GC still serializes access
// to JS runtime. See bug 380139.
XPCAutoLock lock(rt->GetMapLock());
KillDyingScopes();
}
size_t
XPCWrappedNativeScope::SizeOfAllScopesIncludingThis(nsMallocSizeOfFun mallocSizeOf)
{
XPCJSRuntime *rt = nsXPConnect::GetRuntimeInstance();
XPCAutoLock lock(rt->GetMapLock());
size_t n = 0;
for (XPCWrappedNativeScope *cur = gScopes; cur; cur = cur->mNext) {
n += cur->SizeOfIncludingThis(mallocSizeOf);
}
return n;
}
JSBool
WrapperMoved(JSContext *cx, XPCWrappedNative *innerObj,
XPCWrappedNativeScope *newScope)
{
typedef WrappedNative2WrapperMap::Link Link;
XPCJSRuntime *rt = nsXPConnect::GetRuntimeInstance();
WrappedNative2WrapperMap *map = innerObj->GetScope()->GetWrapperMap();
Link *link;
{ // Scoped lock
XPCAutoLock al(rt->GetMapLock());
link = map->FindLink(innerObj->GetFlatJSObject());
}
if (!link) {
// No link here means that there were no XOWs for this object.
return JS_TRUE;
}
JSObject *xow = link->obj;
{ // Scoped lock.
XPCAutoLock al(rt->GetMapLock());
if (!newScope->GetWrapperMap()->AddLink(innerObj->GetFlatJSObject(), link))
return JS_FALSE;
map->Remove(innerObj->GetFlatJSObject());
}
if (!xow) {
// Nothing else to do.
return JS_TRUE;
}
return JS_SetReservedSlot(cx, xow, XPC_XOW_ScopeSlot,
PRIVATE_TO_JSVAL(newScope)) &&
JS_SetParent(cx, xow, newScope->GetGlobalJSObject());
}
nsXPCWrappedJS::~nsXPCWrappedJS()
{
NS_PRECONDITION(0 == mRefCnt, "refcounting error");
if (mRoot == this) {
// Remove this root wrapper from the map
XPCJSRuntime* rt = nsXPConnect::GetRuntimeInstance();
JSObject2WrappedJSMap* map = rt->GetWrappedJSMap();
if (map) {
XPCAutoLock lock(rt->GetMapLock());
map->Remove(this);
}
}
Unlink();
}
// static
XPCNativeSet*
XPCNativeSet::GetNewOrUsed(XPCCallContext& ccx, nsIClassInfo* classInfo)
{
AutoMarkingNativeSetPtr set(ccx);
XPCJSRuntime* rt = ccx.GetRuntime();
ClassInfo2NativeSetMap* map = rt->GetClassInfo2NativeSetMap();
if (!map)
return nsnull;
{ // scoped lock
XPCAutoLock lock(rt->GetMapLock());
set = map->Find(classInfo);
}
if (set)
return set;
nsIID** iidArray = nsnull;
AutoMarkingNativeInterfacePtrArrayPtr interfaceArray(ccx);
PRUint32 iidCount = 0;
if (NS_FAILED(classInfo->GetInterfaces(&iidCount, &iidArray))) {
// Note: I'm making it OK for this call to fail so that one can add
// nsIClassInfo to classes implemented in script without requiring this
// method to be implemented.
// Make sure these are set correctly...
iidArray = nsnull;
iidCount = 0;
}
NS_ASSERTION((iidCount && iidArray) || !(iidCount || iidArray), "GetInterfaces returned bad array");
// !!! from here on we only exit through the 'out' label !!!
if (iidCount) {
AutoMarkingNativeInterfacePtrArrayPtr
arr(ccx, new XPCNativeInterface*[iidCount], iidCount, true);
if (!arr)
goto out;
interfaceArray = arr;
XPCNativeInterface** currentInterface = interfaceArray;
nsIID** currentIID = iidArray;
PRUint16 interfaceCount = 0;
for (PRUint32 i = 0; i < iidCount; i++) {
nsIID* iid = *(currentIID++);
if (!iid) {
NS_ERROR("Null found in classinfo interface list");
continue;
}
XPCNativeInterface* iface =
XPCNativeInterface::GetNewOrUsed(ccx, iid);
if (!iface) {
// XXX warn here
continue;
}
*(currentInterface++) = iface;
interfaceCount++;
}
if (interfaceCount) {
set = NewInstance(ccx, interfaceArray, interfaceCount);
if (set) {
NativeSetMap* map2 = rt->GetNativeSetMap();
if (!map2)
goto out;
XPCNativeSetKey key(set, nsnull, 0);
{ // scoped lock
XPCAutoLock lock(rt->GetMapLock());
XPCNativeSet* set2 = map2->Add(&key, set);
if (!set2) {
NS_ERROR("failed to add our set!");
DestroyInstance(set);
set = nsnull;
goto out;
}
if (set2 != set) {
DestroyInstance(set);
set = set2;
}
}
}
} else
set = GetNewOrUsed(ccx, &NS_GET_IID(nsISupports));
} else
set = GetNewOrUsed(ccx, &NS_GET_IID(nsISupports));
if (set)
{ // scoped lock
XPCAutoLock lock(rt->GetMapLock());
#ifdef DEBUG
XPCNativeSet* set2 =
#endif
map->Add(classInfo, set);
NS_ASSERTION(set2, "failed to add our set!");
NS_ASSERTION(set2 == set, "hashtables inconsistent!");
}
out:
if (iidArray)
NS_FREE_XPCOM_ALLOCATED_POINTER_ARRAY(iidCount, iidArray);
if (interfaceArray)
delete [] interfaceArray.get();
return set;
}
// static
nsresult
nsXPCWrappedJS::GetNewOrUsed(JS::HandleObject jsObj,
REFNSIID aIID,
nsISupports* aOuter,
nsXPCWrappedJS** wrapperResult)
{
// Do a release-mode assert against accessing nsXPCWrappedJS off-main-thread.
if (!MOZ_LIKELY(NS_IsMainThread() || NS_IsCycleCollectorThread()))
MOZ_CRASH();
AutoJSContext cx;
JSObject2WrappedJSMap* map;
nsXPCWrappedJS* root = nullptr;
nsXPCWrappedJS* wrapper = nullptr;
nsXPCWrappedJSClass* clazz = nullptr;
XPCJSRuntime* rt = nsXPConnect::GetRuntimeInstance();
bool release_root = false;
map = rt->GetWrappedJSMap();
if (!map) {
NS_ASSERTION(map,"bad map");
return NS_ERROR_FAILURE;
}
nsXPCWrappedJSClass::GetNewOrUsed(cx, aIID, &clazz);
if (!clazz)
return NS_ERROR_FAILURE;
// from here on we need to return through 'return_wrapper'
// always find the root JSObject
JS::RootedObject rootJSObj(cx, clazz->GetRootJSObject(cx, jsObj));
if (!rootJSObj)
goto return_wrapper;
// look for the root wrapper, and if found, hold the map lock until
// we've added our ref to prevent another thread from destroying it
// under us
{ // scoped lock
XPCAutoLock lock(rt->GetMapLock());
root = map->Find(rootJSObj);
if (root) {
if ((nullptr != (wrapper = root->Find(aIID))) ||
(nullptr != (wrapper = root->FindInherited(aIID)))) {
NS_ADDREF(wrapper);
goto return_wrapper;
}
}
}
if (!root) {
// build the root wrapper
if (rootJSObj == jsObj) {
// the root will do double duty as the interface wrapper
wrapper = root = new nsXPCWrappedJS(cx, jsObj, clazz, nullptr,
aOuter);
if (!root)
goto return_wrapper;
{ // scoped lock
#if DEBUG_xpc_leaks
printf("Created nsXPCWrappedJS %p, JSObject is %p\n",
(void*)wrapper, (void*)jsObj);
#endif
XPCAutoLock lock(rt->GetMapLock());
map->Add(cx, root);
}
if (!CheckMainThreadOnly(root)) {
XPCAutoLock lock(rt->GetMapLock());
map->Remove(root);
wrapper = NULL;
}
goto return_wrapper;
} else {
// just a root wrapper
nsXPCWrappedJSClass* rootClazz = nullptr;
nsXPCWrappedJSClass::GetNewOrUsed(cx, NS_GET_IID(nsISupports),
&rootClazz);
if (!rootClazz)
goto return_wrapper;
root = new nsXPCWrappedJS(cx, rootJSObj, rootClazz, nullptr, aOuter);
NS_RELEASE(rootClazz);
if (!root)
goto return_wrapper;
release_root = true;
{ // scoped lock
#if DEBUG_xpc_leaks
printf("Created nsXPCWrappedJS %p, JSObject is %p\n",
(void*)root, (void*)rootJSObj);
#endif
XPCAutoLock lock(rt->GetMapLock());
map->Add(cx, root);
}
if (!CheckMainThreadOnly(root)) {
XPCAutoLock lock(rt->GetMapLock());
map->Remove(root);
goto return_wrapper;
}
}
}
// at this point we have a root and may need to build the specific wrapper
NS_ASSERTION(root,"bad root");
NS_ASSERTION(clazz,"bad clazz");
if (!wrapper) {
wrapper = new nsXPCWrappedJS(cx, jsObj, clazz, root, aOuter);
if (!wrapper)
goto return_wrapper;
#if DEBUG_xpc_leaks
printf("Created nsXPCWrappedJS %p, JSObject is %p\n",
(void*)wrapper, (void*)jsObj);
#endif
}
wrapper->mNext = root->mNext;
root->mNext = wrapper;
return_wrapper:
if (clazz)
NS_RELEASE(clazz);
if (release_root)
NS_RELEASE(root);
if (!wrapper)
return NS_ERROR_FAILURE;
*wrapperResult = wrapper;
return NS_OK;
}
// static
JSBool XPCJSRuntime::GCCallback(JSContext *cx, JSGCStatus status)
{
nsVoidArray* dyingWrappedJSArray;
XPCJSRuntime* self = nsXPConnect::GetRuntime();
if(self)
{
switch(status)
{
case JSGC_BEGIN:
{
if(!NS_IsMainThread())
{
return JS_FALSE;
}
break;
}
case JSGC_MARK_END:
{
NS_ASSERTION(!self->mDoingFinalization, "bad state");
// mThreadRunningGC indicates that GC is running
{ // scoped lock
XPCAutoLock lock(self->GetMapLock());
NS_ASSERTION(!self->mThreadRunningGC, "bad state");
self->mThreadRunningGC = PR_GetCurrentThread();
}
dyingWrappedJSArray = &self->mWrappedJSToReleaseArray;
{
JSDyingJSObjectData data = {cx, dyingWrappedJSArray};
// Add any wrappers whose JSObjects are to be finalized to
// this array. Note that this is a nsVoidArray because
// we do not want to be changing the refcount of these wrappers.
// We add them to the array now and Release the array members
// later to avoid the posibility of doing any JS GCThing
// allocations during the gc cycle.
self->mWrappedJSMap->
Enumerate(WrappedJSDyingJSObjectFinder, &data);
}
// Do cleanup in NativeInterfaces. This part just finds
// member cloned function objects that are about to be
// collected. It does not deal with collection of interfaces or
// sets at this point.
CX_AND_XPCRT_Data data = {cx, self};
self->mIID2NativeInterfaceMap->
Enumerate(NativeInterfaceGC, &data);
// Find dying scopes...
XPCWrappedNativeScope::FinishedMarkPhaseOfGC(cx, self);
self->mDoingFinalization = JS_TRUE;
break;
}
case JSGC_FINALIZE_END:
{
NS_ASSERTION(self->mDoingFinalization, "bad state");
self->mDoingFinalization = JS_FALSE;
// Release all the members whose JSObjects are now known
// to be dead.
dyingWrappedJSArray = &self->mWrappedJSToReleaseArray;
while(1)
{
nsXPCWrappedJS* wrapper;
PRInt32 count = dyingWrappedJSArray->Count();
if(!count)
{
dyingWrappedJSArray->Compact();
break;
}
wrapper = static_cast<nsXPCWrappedJS*>
(dyingWrappedJSArray->ElementAt(count-1));
dyingWrappedJSArray->RemoveElementAt(count-1);
NS_RELEASE(wrapper);
}
#ifdef XPC_REPORT_NATIVE_INTERFACE_AND_SET_FLUSHING
printf("--------------------------------------------------------------\n");
int setsBefore = (int) self->mNativeSetMap->Count();
int ifacesBefore = (int) self->mIID2NativeInterfaceMap->Count();
#endif
// We use this occasion to mark and sweep NativeInterfaces,
// NativeSets, and the WrappedNativeJSClasses...
// Do the marking...
XPCWrappedNativeScope::MarkAllWrappedNativesAndProtos();
self->mDetachedWrappedNativeProtoMap->
Enumerate(DetachedWrappedNativeProtoMarker, nsnull);
// Mark the sets used in the call contexts. There is a small
// chance that a wrapper's set will change *while* a call is
// happening which uses that wrapper's old interfface set. So,
// we need to do this marking to avoid collecting those sets
// that might no longer be otherwise reachable from the wrappers
// or the wrapperprotos.
// Skip this part if XPConnect is shutting down. We get into
// bad locking problems with the thread iteration otherwise.
if(!self->GetXPConnect()->IsShuttingDown())
{
PRLock* threadLock = XPCPerThreadData::GetLock();
if(threadLock)
{ // scoped lock
nsAutoLock lock(threadLock);
XPCPerThreadData* iterp = nsnull;
XPCPerThreadData* thread;
while(nsnull != (thread =
XPCPerThreadData::IterateThreads(&iterp)))
{
// Mark those AutoMarkingPtr lists!
thread->MarkAutoRootsAfterJSFinalize();
XPCCallContext* ccxp = thread->GetCallContext();
while(ccxp)
{
// Deal with the strictness of callcontext that
// complains if you ask for a set when
// it is in a state where the set could not
// possibly be valid.
if(ccxp->CanGetSet())
{
XPCNativeSet* set = ccxp->GetSet();
if(set)
set->Mark();
}
if(ccxp->CanGetInterface())
{
XPCNativeInterface* iface = ccxp->GetInterface();
if(iface)
iface->Mark();
}
ccxp = ccxp->GetPrevCallContext();
}
}
}
}
// Do the sweeping...
// We don't want to sweep the JSClasses at shutdown time.
// At this point there may be JSObjects using them that have
// been removed from the other maps.
if(!self->GetXPConnect()->IsShuttingDown())
{
self->mNativeScriptableSharedMap->
Enumerate(JSClassSweeper, nsnull);
}
self->mClassInfo2NativeSetMap->
Enumerate(NativeUnMarkedSetRemover, nsnull);
self->mNativeSetMap->
Enumerate(NativeSetSweeper, nsnull);
CX_AND_XPCRT_Data data = {cx, self};
self->mIID2NativeInterfaceMap->
Enumerate(NativeInterfaceSweeper, &data);
#ifdef DEBUG
XPCWrappedNativeScope::ASSERT_NoInterfaceSetsAreMarked();
#endif
#ifdef XPC_REPORT_NATIVE_INTERFACE_AND_SET_FLUSHING
int setsAfter = (int) self->mNativeSetMap->Count();
int ifacesAfter = (int) self->mIID2NativeInterfaceMap->Count();
printf("\n");
printf("XPCNativeSets: before: %d collected: %d remaining: %d\n",
setsBefore, setsBefore - setsAfter, setsAfter);
printf("XPCNativeInterfaces: before: %d collected: %d remaining: %d\n",
ifacesBefore, ifacesBefore - ifacesAfter, ifacesAfter);
printf("--------------------------------------------------------------\n");
#endif
// Sweep scopes needing cleanup
XPCWrappedNativeScope::FinishedFinalizationPhaseOfGC(cx);
// Now we are going to recycle any unused WrappedNativeTearoffs.
// We do this by iterating all the live callcontexts (on all
// threads!) and marking the tearoffs in use. And then we
// iterate over all the WrappedNative wrappers and sweep their
// tearoffs.
//
// This allows us to perhaps minimize the growth of the
// tearoffs. And also makes us not hold references to interfaces
// on our wrapped natives that we are not actually using.
//
// XXX We may decide to not do this on *every* gc cycle.
// Skip this part if XPConnect is shutting down. We get into
// bad locking problems with the thread iteration otherwise.
if(!self->GetXPConnect()->IsShuttingDown())
{
PRLock* threadLock = XPCPerThreadData::GetLock();
if(threadLock)
{
// Do the marking...
{ // scoped lock
nsAutoLock lock(threadLock);
XPCPerThreadData* iterp = nsnull;
XPCPerThreadData* thread;
while(nsnull != (thread =
XPCPerThreadData::IterateThreads(&iterp)))
{
XPCCallContext* ccxp = thread->GetCallContext();
while(ccxp)
{
// Deal with the strictness of callcontext that
// complains if you ask for a tearoff when
// it is in a state where the tearoff could not
// possibly be valid.
if(ccxp->CanGetTearOff())
{
XPCWrappedNativeTearOff* to =
ccxp->GetTearOff();
if(to)
to->Mark();
}
ccxp = ccxp->GetPrevCallContext();
}
}
}
// Do the sweeping...
XPCWrappedNativeScope::SweepAllWrappedNativeTearOffs();
}
}
// Now we need to kill the 'Dying' XPCWrappedNativeProtos.
// We transfered these native objects to this table when their
// JSObject's were finalized. We did not destroy them immediately
// at that point because the ordering of JS finalization is not
// deterministic and we did not yet know if any wrappers that
// might still be referencing the protos where still yet to be
// finalized and destroyed. We *do* know that the protos'
// JSObjects would not have been finalized if there were any
// wrappers that referenced the proto but where not themselves
// slated for finalization in this gc cycle. So... at this point
// we know that any and all wrappers that might have been
// referencing the protos in the dying list are themselves dead.
// So, we can safely delete all the protos in the list.
self->mDyingWrappedNativeProtoMap->
Enumerate(DyingProtoKiller, nsnull);
// mThreadRunningGC indicates that GC is running.
// Clear it and notify waiters.
{ // scoped lock
XPCAutoLock lock(self->GetMapLock());
NS_ASSERTION(self->mThreadRunningGC == PR_GetCurrentThread(), "bad state");
self->mThreadRunningGC = nsnull;
xpc_NotifyAll(self->GetMapLock());
}
break;
}
case JSGC_END:
{
// NOTE that this event happens outside of the gc lock in
// the js engine. So this could be simultaneous with the
// events above.
// Do any deferred released of native objects.
nsVoidArray* array = &self->mNativesToReleaseArray;
#ifdef XPC_TRACK_DEFERRED_RELEASES
printf("XPC - Begin deferred Release of %d nsISupports pointers\n",
array->Count());
#endif
while(1)
{
nsISupports* obj;
{
PRInt32 count = array->Count();
if(!count)
{
array->Compact();
break;
}
obj = reinterpret_cast<nsISupports*>
(array->ElementAt(count-1));
array->RemoveElementAt(count-1);
}
NS_RELEASE(obj);
}
#ifdef XPC_TRACK_DEFERRED_RELEASES
printf("XPC - End deferred Releases\n");
#endif
break;
}
default:
break;
}
}
// always chain to old GCCallback if non-null.
return gOldJSGCCallback ? gOldJSGCCallback(cx, status) : JS_TRUE;
}
// static
nsresult
nsXPCWrappedJS::GetNewOrUsed(XPCCallContext& ccx,
JSObject* aJSObj,
REFNSIID aIID,
nsISupports* aOuter,
nsXPCWrappedJS** wrapperResult)
{
JSObject2WrappedJSMap* map;
JSObject* rootJSObj;
nsXPCWrappedJS* root = nsnull;
nsXPCWrappedJS* wrapper = nsnull;
nsXPCWrappedJSClass* clazz = nsnull;
XPCJSRuntime* rt = ccx.GetRuntime();
JSBool release_root = JS_FALSE;
map = rt->GetWrappedJSMap();
if (!map) {
NS_ASSERTION(map,"bad map");
return NS_ERROR_FAILURE;
}
nsXPCWrappedJSClass::GetNewOrUsed(ccx, aIID, &clazz);
if (!clazz)
return NS_ERROR_FAILURE;
// from here on we need to return through 'return_wrapper'
// always find the root JSObject
rootJSObj = clazz->GetRootJSObject(ccx, aJSObj);
if (!rootJSObj)
goto return_wrapper;
// look for the root wrapper, and if found, hold the map lock until
// we've added our ref to prevent another thread from destroying it
// under us
{ // scoped lock
XPCAutoLock lock(rt->GetMapLock());
root = map->Find(rootJSObj);
if (root) {
if ((nsnull != (wrapper = root->Find(aIID))) ||
(nsnull != (wrapper = root->FindInherited(aIID)))) {
NS_ADDREF(wrapper);
goto return_wrapper;
}
}
}
if (!root) {
// build the root wrapper
if (rootJSObj == aJSObj) {
// the root will do double duty as the interface wrapper
wrapper = root = new nsXPCWrappedJS(ccx, aJSObj, clazz, nsnull,
aOuter);
if (!root)
goto return_wrapper;
{ // scoped lock
#if DEBUG_xpc_leaks
printf("Created nsXPCWrappedJS %p, JSObject is %p\n",
(void*)wrapper, (void*)aJSObj);
#endif
XPCAutoLock lock(rt->GetMapLock());
map->Add(root);
}
if (!CheckMainThreadOnly(root)) {
XPCAutoLock lock(rt->GetMapLock());
map->Remove(root);
wrapper = NULL;
}
goto return_wrapper;
} else {
// just a root wrapper
nsXPCWrappedJSClass* rootClazz = nsnull;
nsXPCWrappedJSClass::GetNewOrUsed(ccx, NS_GET_IID(nsISupports),
&rootClazz);
if (!rootClazz)
goto return_wrapper;
root = new nsXPCWrappedJS(ccx, rootJSObj, rootClazz, nsnull, aOuter);
NS_RELEASE(rootClazz);
if (!root)
goto return_wrapper;
release_root = JS_TRUE;
{ // scoped lock
#if DEBUG_xpc_leaks
printf("Created nsXPCWrappedJS %p, JSObject is %p\n",
(void*)root, (void*)rootJSObj);
#endif
XPCAutoLock lock(rt->GetMapLock());
map->Add(root);
}
if (!CheckMainThreadOnly(root)) {
XPCAutoLock lock(rt->GetMapLock());
map->Remove(root);
goto return_wrapper;
}
}
}
// at this point we have a root and may need to build the specific wrapper
NS_ASSERTION(root,"bad root");
NS_ASSERTION(clazz,"bad clazz");
if (!wrapper) {
wrapper = new nsXPCWrappedJS(ccx, aJSObj, clazz, root, aOuter);
if (!wrapper)
goto return_wrapper;
#if DEBUG_xpc_leaks
printf("Created nsXPCWrappedJS %p, JSObject is %p\n",
(void*)wrapper, (void*)aJSObj);
#endif
}
wrapper->mNext = root->mNext;
root->mNext = wrapper;
return_wrapper:
if (clazz)
NS_RELEASE(clazz);
if (release_root)
NS_RELEASE(root);
if (!wrapper)
return NS_ERROR_FAILURE;
*wrapperResult = wrapper;
return NS_OK;
}
