/* static */ ArgumentsObject *
ArgumentsObject::create(JSContext *cx, HandleScript script, HandleFunction callee, unsigned numActuals,
CopyArgs ©)
{
RootedObject proto(cx, callee->global().getOrCreateObjectPrototype(cx));
if (!proto)
return NULL;
bool strict = callee->strict();
Class *clasp = strict ? &StrictArgumentsObjectClass : &NormalArgumentsObjectClass;
RootedTypeObject type(cx, proto->getNewType(cx, clasp));
if (!type)
return NULL;
RootedShape shape(cx, EmptyShape::getInitialShape(cx, clasp, TaggedProto(proto),
proto->getParent(), FINALIZE_KIND,
BaseShape::INDEXED));
if (!shape)
return NULL;
unsigned numFormals = callee->nargs;
unsigned numDeletedWords = NumWordsForBitArrayOfLength(numActuals);
unsigned numArgs = Max(numActuals, numFormals);
unsigned numBytes = offsetof(ArgumentsData, args) +
numDeletedWords * sizeof(size_t) +
numArgs * sizeof(Value);
ArgumentsData *data = (ArgumentsData *)cx->malloc_(numBytes);
if (!data)
return NULL;
data->numArgs = numArgs;
data->callee.init(ObjectValue(*callee.get()));
data->script = script;
/* Copy [0, numArgs) into data->slots. */
HeapValue *dst = data->args, *dstEnd = data->args + numArgs;
copy.copyArgs(cx, dst);
data->deletedBits = reinterpret_cast<size_t *>(dstEnd);
ClearAllBitArrayElements(data->deletedBits, numDeletedWords);
RawObject obj = JSObject::create(cx, FINALIZE_KIND, GetInitialHeap(GenericObject, clasp),
shape, type);
if (!obj) {
js_free(data);
return NULL;
}
obj->initFixedSlot(INITIAL_LENGTH_SLOT, Int32Value(numActuals << PACKED_BITS_COUNT));
obj->initFixedSlot(DATA_SLOT, PrivateValue(data));
copy.maybeForwardToCallObject(obj, data);
ArgumentsObject &argsobj = obj->asArguments();
JS_ASSERT(argsobj.initialLength() == numActuals);
JS_ASSERT(!argsobj.hasOverriddenLength());
return &argsobj;
}
void
ArgumentsObject::trace(JSTracer *trc, RawObject obj)
{
ArgumentsObject &argsobj = obj->asArguments();
ArgumentsData *data = argsobj.data();
MarkValue(trc, &data->callee, js_callee_str);
MarkValueRange(trc, data->numArgs, data->args, js_arguments_str);
MarkScriptUnbarriered(trc, &data->script, "script");
}
void
ArgumentsObject::finalize(FreeOp *fop, RawObject obj)
{
fop->free_(reinterpret_cast<void *>(obj->asArguments().data()));
}