1/*
2 * Copyright (C) 2019 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. AND ITS CONTRIBUTORS ``AS IS''
14 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
15 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
17 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
18 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
19 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
20 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
21 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
22 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
23 * THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#pragma once
27
28#include "JSObject.h"
29
30namespace JSC {
31
32// This is used for sharing interface and implementation. It should not have its own classInfo.
33template<unsigned passedNumberOfInternalFields = 1>
34class JSInternalFieldObjectImpl : public JSNonFinalObject {
35public:
36 friend class LLIntOffsetsExtractor;
37
38 using Base = JSNonFinalObject;
39 static constexpr unsigned numberOfInternalFields = passedNumberOfInternalFields;
40
41 static size_t allocationSize(Checked<size_t> inlineCapacity)
42 {
43 ASSERT_UNUSED(inlineCapacity, !inlineCapacity);
44 return sizeof(JSInternalFieldObjectImpl);
45 }
46
47 const WriteBarrier<Unknown>& internalField(unsigned index) const
48 {
49 ASSERT(index < numberOfInternalFields);
50 return m_internalFields[index];
51 }
52
53 WriteBarrier<Unknown>& internalField(unsigned index)
54 {
55 ASSERT(index < numberOfInternalFields);
56 return m_internalFields[index];
57 }
58
59 static ptrdiff_t offsetOfInternalFields() { return OBJECT_OFFSETOF(JSInternalFieldObjectImpl, m_internalFields); }
60 static ptrdiff_t offsetOfInternalField(unsigned index) { return OBJECT_OFFSETOF(JSInternalFieldObjectImpl, m_internalFields) + index * sizeof(WriteBarrier<Unknown>); }
61
62protected:
63 static void visitChildren(JSCell*, SlotVisitor&);
64
65 JSInternalFieldObjectImpl(VM& vm, Structure* structure)
66 : Base(vm, structure)
67 {
68 }
69
70 WriteBarrier<Unknown> m_internalFields[numberOfInternalFields] { };
71};
72
73} // namespace JSC
74