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;
    }
}