bool
WatchpointMap::triggerWatchpoint(JSContext* cx, HandleObject obj, HandleId id, MutableHandleValue vp)
{
Map::Ptr p = map.lookup(WatchKey(obj, id));
if (!p || p->value().held)
return true;
AutoEntryHolder holder(cx, map, p);
/* Copy the entry, since GC would invalidate p. */
JSWatchPointHandler handler = p->value().handler;
RootedObject closure(cx, p->value().closure);
/* Determine the property's old value. */
Value old;
old.setUndefined();
if (obj->isNative()) {
NativeObject* nobj = &obj->as<NativeObject>();
if (Shape* shape = nobj->lookup(cx, id)) {
if (shape->hasSlot())
old = nobj->getSlot(shape->slot());
}
}
// Read barrier to prevent an incorrectly gray closure from escaping the
// watchpoint. See the comment before UnmarkGrayChildren in gc/Marking.cpp
JS::ExposeObjectToActiveJS(closure);
/* Call the handler. */
return handler(cx, obj, id, old, vp.address(), closure);
}
void deallocateSigId(const Sig& sig, const void* sigId) {
Map::Ptr p = map_.lookup(sig);
MOZ_RELEASE_ASSERT(p && p->key() == sigId && p->value() > 0);
p->value()--;
if (!p->value()) {
js_delete(p->key());
map_.remove(p);
}
}
void
InnerViewTable::sweepAfterMinorGC(JSRuntime* rt)
{
MOZ_ASSERT(needsSweepAfterMinorGC());
if (nurseryKeysValid) {
for (size_t i = 0; i < nurseryKeys.length(); i++) {
JSObject* key = nurseryKeys[i];
Map::Ptr p = map.lookup(key);
if (!p)
continue;
if (sweepEntry(&key, p->value()))
map.remove(nurseryKeys[i]);
else
map.rekeyIfMoved(nurseryKeys[i], key);
}
nurseryKeys.clear();
} else {
// Do the required sweeping by looking at every map entry.
nurseryKeys.clear();
sweep(rt);
nurseryKeysValid = true;
}
}
InnerViewTable::ViewVector*
InnerViewTable::maybeViewsUnbarriered(ArrayBufferObject* buffer)
{
if (!map.initialized())
return nullptr;
Map::Ptr p = map.lookup(buffer);
if (p)
return &p->value();
return nullptr;
}
void
InnerViewTable::sweepAfterMinorGC()
{
MOZ_ASSERT(needsSweepAfterMinorGC());
if (nurseryKeysValid) {
for (size_t i = 0; i < nurseryKeys.length(); i++) {
JSObject* buffer = MaybeForwarded(nurseryKeys[i]);
Map::Ptr p = map.lookup(buffer);
if (!p)
continue;
if (sweepEntry(&p->mutableKey(), p->value()))
map.remove(buffer);
}
nurseryKeys.clear();
} else {
// Do the required sweeping by looking at every map entry.
nurseryKeys.clear();
sweep();
nurseryKeysValid = true;
}
}