1/*
2 * Copyright (C) 2016-2019 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 "LLIntPrototypeLoadAdaptiveStructureWatchpoint.h"
28
29#include "CodeBlock.h"
30#include "Instruction.h"
31#include "JSCInlines.h"
32
33namespace JSC {
34
35LLIntPrototypeLoadAdaptiveStructureWatchpoint::LLIntPrototypeLoadAdaptiveStructureWatchpoint(CodeBlock* owner, const ObjectPropertyCondition& key, unsigned bytecodeOffset)
36 : Watchpoint(Watchpoint::Type::LLIntPrototypeLoadAdaptiveStructure)
37 , m_owner(owner)
38 , m_bytecodeOffset(bytecodeOffset)
39 , m_key(key)
40{
41 RELEASE_ASSERT(key.watchingRequiresStructureTransitionWatchpoint());
42 RELEASE_ASSERT(!key.watchingRequiresReplacementWatchpoint());
43}
44
45void LLIntPrototypeLoadAdaptiveStructureWatchpoint::install(VM& vm)
46{
47 RELEASE_ASSERT(m_key.isWatchable());
48
49 m_key.object()->structure(vm)->addTransitionWatchpoint(this);
50}
51
52void LLIntPrototypeLoadAdaptiveStructureWatchpoint::fireInternal(VM& vm, const FireDetail&)
53{
54 if (!m_owner->isLive())
55 return;
56
57 if (m_key.isWatchable(PropertyCondition::EnsureWatchability)) {
58 install(vm);
59 return;
60 }
61
62 auto& instruction = m_owner->instructions().at(m_bytecodeOffset.get());
63 clearLLIntGetByIdCache(instruction->as<OpGetById>().metadata(m_owner.get()));
64}
65
66void LLIntPrototypeLoadAdaptiveStructureWatchpoint::clearLLIntGetByIdCache(OpGetById::Metadata& metadata)
67{
68 metadata.m_mode = GetByIdMode::Default;
69 metadata.m_modeMetadata.defaultMode.cachedOffset = 0;
70 metadata.m_modeMetadata.defaultMode.structureID = 0;
71}
72
73
74} // namespace JSC
75