1/*
2 * Copyright (C) 2018 Yusuke Suzuki <utatane.tea@gmail.com>.
3 * Copyright (C) 2018 Apple Inc. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
15 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
17 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
18 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
19 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
20 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
21 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
22 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
24 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27#include "config.h"
28#include "InByIdVariant.h"
29
30#include "JSCInlines.h"
31#include <wtf/ListDump.h>
32
33namespace JSC {
34
35InByIdVariant::InByIdVariant(const StructureSet& structureSet, PropertyOffset offset, const ObjectPropertyConditionSet& conditionSet)
36 : m_structureSet(structureSet)
37 , m_conditionSet(conditionSet)
38 , m_offset(offset)
39{
40 if (!structureSet.size()) {
41 ASSERT(offset == invalidOffset);
42 ASSERT(conditionSet.isEmpty());
43 }
44}
45
46bool InByIdVariant::attemptToMerge(const InByIdVariant& other)
47{
48 if (m_offset != other.m_offset)
49 return false;
50
51 if (m_conditionSet.isEmpty() != other.m_conditionSet.isEmpty())
52 return false;
53
54 ObjectPropertyConditionSet mergedConditionSet;
55 if (!m_conditionSet.isEmpty()) {
56 mergedConditionSet = m_conditionSet.mergedWith(other.m_conditionSet);
57 if (!mergedConditionSet.isValid())
58 return false;
59 // If this is a hit variant, one slot base should exist. If this is not a hit variant, the slot base is not necessary.
60 if (isHit() && !mergedConditionSet.hasOneSlotBaseCondition())
61 return false;
62 }
63 m_conditionSet = mergedConditionSet;
64
65 m_structureSet.merge(other.m_structureSet);
66
67 return true;
68}
69
70void InByIdVariant::markIfCheap(SlotVisitor& visitor)
71{
72 m_structureSet.markIfCheap(visitor);
73}
74
75bool InByIdVariant::finalize(VM& vm)
76{
77 if (!m_structureSet.isStillAlive(vm))
78 return false;
79 if (!m_conditionSet.areStillLive(vm))
80 return false;
81 return true;
82}
83
84void InByIdVariant::dump(PrintStream& out) const
85{
86 dumpInContext(out, 0);
87}
88
89void InByIdVariant::dumpInContext(PrintStream& out, DumpContext* context) const
90{
91 if (!isSet()) {
92 out.print("<empty>");
93 return;
94 }
95
96 out.print(
97 "<", inContext(structureSet(), context), ", ", inContext(m_conditionSet, context));
98 out.print(", offset = ", offset());
99 out.print(">");
100}
101
102} // namespace JSC
103
104