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 "CodeBlock.h"
30
31namespace JSC {
32
33const ClassInfo JSImmutableButterfly::s_info = { "Immutable Butterfly", nullptr, nullptr, nullptr, CREATE_METHOD_TABLE(JSImmutableButterfly) };
34
35void JSImmutableButterfly::visitChildren(JSCell* cell, SlotVisitor& visitor)
36{
37 Base::visitChildren(cell, visitor);
38 if (!hasContiguous(cell->indexingType())) {
39 ASSERT(hasDouble(cell->indexingType()) || hasInt32(cell->indexingType()));
40 return;
41 }
42
43 Butterfly* butterfly = jsCast<JSImmutableButterfly*>(cell)->toButterfly();
44 visitor.appendValuesHidden(butterfly->contiguous().data(), butterfly->publicLength());
45}
46
47void JSImmutableButterfly::copyToArguments(ExecState* exec, VirtualRegister firstElementDest, unsigned offset, unsigned length)
48{
49 for (unsigned i = 0; i < length; ++i) {
50 if ((i + offset) < publicLength())
51 exec->r(firstElementDest + i) = get(i + offset);
52 else
53 exec->r(firstElementDest + i) = jsUndefined();
54 }
55}
56
57static_assert(JSImmutableButterfly::offsetOfData() == sizeof(JSImmutableButterfly), "m_header needs to be adjacent to Data");
58
59} // namespace JSC
60