1/*
2 * Copyright (C) 2016 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 "JSGlobalObject.h"
29
30#include "ArrayPrototype.h"
31#include "ObjectPrototype.h"
32
33namespace JSC {
34
35ALWAYS_INLINE bool JSGlobalObject::objectPrototypeIsSane()
36{
37 return !hasIndexedProperties(m_objectPrototype->indexingType())
38 && m_objectPrototype->getPrototypeDirect(vm()).isNull();
39}
40
41ALWAYS_INLINE bool JSGlobalObject::arrayPrototypeChainIsSane()
42{
43 return !hasIndexedProperties(m_arrayPrototype->indexingType())
44 && m_arrayPrototype->getPrototypeDirect(vm()) == m_objectPrototype.get()
45 && objectPrototypeIsSane();
46}
47
48ALWAYS_INLINE bool JSGlobalObject::stringPrototypeChainIsSane()
49{
50 return !hasIndexedProperties(m_stringPrototype->indexingType())
51 && m_stringPrototype->getPrototypeDirect(vm()) == m_objectPrototype.get()
52 && objectPrototypeIsSane();
53}
54
55ALWAYS_INLINE bool JSGlobalObject::isArrayPrototypeIteratorProtocolFastAndNonObservable()
56{
57 // We're fast if we don't have any indexed properties on the prototype.
58 // We're non-observable if the iteration protocol hasn't changed.
59 //
60 // Note: it only makes sense to call this from the main thread. If you're
61 // trying to prove this behavior on the compiler thread, you'll want to
62 // carefully set up watchpoints to have correct ordering while JS code is
63 // executing concurrently.
64
65 return arrayIteratorProtocolWatchpoint().isStillValid() && !isHavingABadTime() && arrayPrototypeChainIsSane();
66}
67
68// We're non-observable if the iteration protocol hasn't changed.
69//
70// Note: it only makes sense to call this from the main thread. If you're
71// trying to prove this behavior on the compiler thread, you'll want to
72// carefully set up watchpoints to have correct ordering while JS code is
73// executing concurrently.
74ALWAYS_INLINE bool JSGlobalObject::isMapPrototypeIteratorProtocolFastAndNonObservable()
75{
76 return mapIteratorProtocolWatchpoint().isStillValid();
77}
78
79ALWAYS_INLINE bool JSGlobalObject::isSetPrototypeIteratorProtocolFastAndNonObservable()
80{
81 return setIteratorProtocolWatchpoint().isStillValid();
82}
83
84ALWAYS_INLINE bool JSGlobalObject::isStringPrototypeIteratorProtocolFastAndNonObservable()
85{
86 return stringIteratorProtocolWatchpoint().isStillValid();
87}
88
89ALWAYS_INLINE bool JSGlobalObject::isMapPrototypeSetFastAndNonObservable()
90{
91 return mapSetWatchpoint().isStillValid();
92}
93
94ALWAYS_INLINE bool JSGlobalObject::isSetPrototypeAddFastAndNonObservable()
95{
96 return setAddWatchpoint().isStillValid();
97}
98
99} // namespace JSC
100