1/*
2 * Copyright (C) 2018 Apple Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#include "config.h"
27#include "JSImmutableButterfly.h"
28
29#include "ButterflyInlines.h"
30#include "CodeBlock.h"
31
32namespace JSC {
33
34const ClassInfo JSImmutableButterfly::s_info = { "Immutable Butterfly", nullptr, nullptr, nullptr, CREATE_METHOD_TABLE(JSImmutableButterfly) };
35
36void JSImmutableButterfly::visitChildren(JSCell* cell, SlotVisitor& visitor)
37{
38 ASSERT_GC_OBJECT_INHERITS(cell, info());
39 Base::visitChildren(cell, visitor);
40 if (!hasContiguous(cell->indexingType())) {
41 ASSERT(hasDouble(cell->indexingType()) || hasInt32(cell->indexingType()));
42 return;
43 }
44
45 Butterfly* butterfly = jsCast<JSImmutableButterfly*>(cell)->toButterfly();
46 visitor.appendValuesHidden(butterfly->contiguous().data(), butterfly->publicLength());
47}
48
49void JSImmutableButterfly::copyToArguments(JSGlobalObject*, CallFrame* callFrame, VirtualRegister firstElementDest, unsigned offset, unsigned length)
50{
51 for (unsigned i = 0; i < length; ++i) {
52 if ((i + offset) < publicLength())
53 callFrame->r(firstElementDest + i) = get(i + offset);
54 else
55 callFrame->r(firstElementDest + i) = jsUndefined();
56 }
57}
58
59static_assert(JSImmutableButterfly::offsetOfData() == sizeof(JSImmutableButterfly), "m_header needs to be adjacent to Data");
60
61} // namespace JSC
62