1/*
2 * Copyright (C) 2015-2017 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#include "config.h"
27#include "AdaptiveInferredPropertyValueWatchpointBase.h"
28
29#include "JSCInlines.h"
30
31namespace JSC {
32
33AdaptiveInferredPropertyValueWatchpointBase::AdaptiveInferredPropertyValueWatchpointBase(const ObjectPropertyCondition& key)
34 : m_key(key)
35{
36 RELEASE_ASSERT(key.kind() == PropertyCondition::Equivalence);
37}
38
39void AdaptiveInferredPropertyValueWatchpointBase::install(VM& vm)
40{
41 RELEASE_ASSERT(m_key.isWatchable());
42
43 Structure* structure = m_key.object()->structure(vm);
44
45 structure->addTransitionWatchpoint(&m_structureWatchpoint);
46
47 PropertyOffset offset = structure->getConcurrently(m_key.uid());
48 WatchpointSet* set = structure->propertyReplacementWatchpointSet(offset);
49 set->add(&m_propertyWatchpoint);
50}
51
52void AdaptiveInferredPropertyValueWatchpointBase::fire(VM& vm, const FireDetail& detail)
53{
54 // One of the watchpoints fired, but the other one didn't. Make sure that neither of them are
55 // in any set anymore. This simplifies things by allowing us to reinstall the watchpoints
56 // wherever from scratch.
57 if (m_structureWatchpoint.isOnList())
58 m_structureWatchpoint.remove();
59 if (m_propertyWatchpoint.isOnList())
60 m_propertyWatchpoint.remove();
61
62 if (!isValid())
63 return;
64
65 if (m_key.isWatchable(PropertyCondition::EnsureWatchability)) {
66 install(vm);
67 return;
68 }
69
70 handleFire(vm, detail);
71}
72
73bool AdaptiveInferredPropertyValueWatchpointBase::isValid() const
74{
75 return true;
76}
77
78void AdaptiveInferredPropertyValueWatchpointBase::StructureWatchpoint::fireInternal(VM& vm, const FireDetail& detail)
79{
80 ptrdiff_t myOffset = OBJECT_OFFSETOF(AdaptiveInferredPropertyValueWatchpointBase, m_structureWatchpoint);
81
82 AdaptiveInferredPropertyValueWatchpointBase* parent = bitwise_cast<AdaptiveInferredPropertyValueWatchpointBase*>(bitwise_cast<char*>(this) - myOffset);
83
84 parent->fire(vm, detail);
85}
86
87void AdaptiveInferredPropertyValueWatchpointBase::PropertyWatchpoint::fireInternal(VM& vm, const FireDetail& detail)
88{
89 ptrdiff_t myOffset = OBJECT_OFFSETOF(AdaptiveInferredPropertyValueWatchpointBase, m_propertyWatchpoint);
90
91 AdaptiveInferredPropertyValueWatchpointBase* parent = bitwise_cast<AdaptiveInferredPropertyValueWatchpointBase*>(bitwise_cast<char*>(this) - myOffset);
92
93 parent->fire(vm, detail);
94}
95
96} // namespace JSC
97