1/*
2 * Copyright (C) 2012, 2015-2016 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#include "config.h"
27#include "StructureStubClearingWatchpoint.h"
28
29#if ENABLE(JIT)
30
31#include "CodeBlock.h"
32#include "JSCInlines.h"
33#include "StructureStubInfo.h"
34
35namespace JSC {
36
37void StructureStubClearingWatchpoint::fireInternal(VM& vm, const FireDetail&)
38{
39 if (!m_holder->isValid())
40 return;
41
42 if (!m_key || !m_key.isWatchable(PropertyCondition::EnsureWatchability)) {
43 // This will implicitly cause my own demise: stub reset removes all watchpoints.
44 // That works, because deleting a watchpoint removes it from the set's list, and
45 // the set's list traversal for firing is robust against the set changing.
46 ConcurrentJSLocker locker(m_holder->codeBlock()->m_lock);
47 m_holder->stubInfo()->reset(m_holder->codeBlock());
48 return;
49 }
50
51 if (m_key.kind() == PropertyCondition::Presence) {
52 // If this was a presence condition, let's watch the property for replacements. This is profitable
53 // for the DFG, which will want the replacement set to be valid in order to do constant folding.
54 m_key.object()->structure(vm)->startWatchingPropertyForReplacements(vm, m_key.offset());
55 }
56
57 m_key.object()->structure(vm)->addTransitionWatchpoint(this);
58}
59
60inline bool WatchpointsOnStructureStubInfo::isValid() const
61{
62 return m_codeBlock->isLive();
63}
64
65StructureStubClearingWatchpoint* WatchpointsOnStructureStubInfo::addWatchpoint(const ObjectPropertyCondition& key)
66{
67 return m_watchpoints.add(key, *this);
68}
69
70StructureStubClearingWatchpoint* WatchpointsOnStructureStubInfo::ensureReferenceAndAddWatchpoint(
71 std::unique_ptr<WatchpointsOnStructureStubInfo>& holderRef, CodeBlock* codeBlock,
72 StructureStubInfo* stubInfo, const ObjectPropertyCondition& key)
73{
74 if (!holderRef)
75 holderRef = std::make_unique<WatchpointsOnStructureStubInfo>(codeBlock, stubInfo);
76 else {
77 ASSERT(holderRef->m_codeBlock == codeBlock);
78 ASSERT(holderRef->m_stubInfo == stubInfo);
79 }
80
81 return holderRef->addWatchpoint(key);
82}
83
84} // namespace JSC
85
86#endif // ENABLE(JIT)
87
88