1/*
2 * Copyright (C) 2013-2017 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#pragma once
27
28#include "VM.h"
29#include "JSGlobalObject.h"
30#include "ObjectPrototype.h"
31#include "SlotVisitor.h"
32#include "WriteBarrier.h"
33
34namespace JSC {
35
36class FunctionRareData;
37
38class ObjectAllocationProfile {
39 friend class LLIntOffsetsExtractor;
40public:
41 static ptrdiff_t offsetOfAllocator() { return OBJECT_OFFSETOF(ObjectAllocationProfile, m_allocator); }
42 static ptrdiff_t offsetOfStructure() { return OBJECT_OFFSETOF(ObjectAllocationProfile, m_structure); }
43 static ptrdiff_t offsetOfInlineCapacity() { return OBJECT_OFFSETOF(ObjectAllocationProfile, m_inlineCapacity); }
44
45 ObjectAllocationProfile()
46 : m_inlineCapacity(0)
47 {
48 }
49
50 bool isNull() { return !m_structure; }
51
52 void initializeProfile(VM&, JSGlobalObject*, JSCell* owner, JSObject* prototype, unsigned inferredInlineCapacity, JSFunction* constructor = nullptr, FunctionRareData* = nullptr);
53
54 Structure* structure()
55 {
56 Structure* structure = m_structure.get();
57 // Ensure that if we see the structure, it has been properly created
58 WTF::loadLoadFence();
59 return structure;
60 }
61 JSObject* prototype()
62 {
63 JSObject* prototype = m_prototype.get();
64 WTF::loadLoadFence();
65 return prototype;
66 }
67 unsigned inlineCapacity() { return m_inlineCapacity; }
68
69
70 void clear()
71 {
72 m_allocator = Allocator();
73 m_structure.clear();
74 m_prototype.clear();
75 m_inlineCapacity = 0;
76 ASSERT(isNull());
77 }
78
79 void visitAggregate(SlotVisitor& visitor)
80 {
81 visitor.append(m_structure);
82 visitor.append(m_prototype);
83 }
84
85private:
86 unsigned possibleDefaultPropertyCount(VM&, JSObject* prototype);
87
88 Allocator m_allocator; // Precomputed to make things easier for generated code.
89 WriteBarrier<Structure> m_structure;
90 WriteBarrier<JSObject> m_prototype;
91 unsigned m_inlineCapacity;
92};
93
94} // namespace JSC
95