1/*
2 * Copyright (C) 2011, 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 "DFGExitProfile.h"
28
29#if ENABLE(DFG_JIT)
30
31#include "CodeBlock.h"
32#include "VMInlines.h"
33
34namespace JSC { namespace DFG {
35
36void FrequentExitSite::dump(PrintStream& out) const
37{
38 out.print("bc#", m_bytecodeOffset, ": ", m_kind, "/", m_jitType, "/", m_inlineKind);
39}
40
41ExitProfile::ExitProfile() { }
42ExitProfile::~ExitProfile() { }
43
44bool ExitProfile::add(CodeBlock* owner, const FrequentExitSite& site)
45{
46 RELEASE_ASSERT(site.jitType() != ExitFromAnything);
47 RELEASE_ASSERT(site.inlineKind() != ExitFromAnyInlineKind);
48
49 ConcurrentJSLocker locker(owner->unlinkedCodeBlock()->m_lock);
50
51 CODEBLOCK_LOG_EVENT(owner, "frequentExit", (site));
52
53 if (Options::verboseExitProfile())
54 dataLog(pointerDump(owner), ": Adding exit site: ", site, "\n");
55
56 ExitProfile& profile = owner->unlinkedCodeBlock()->exitProfile();
57
58 // If we've never seen any frequent exits then create the list and put this site
59 // into it.
60 if (!profile.m_frequentExitSites) {
61 profile.m_frequentExitSites = std::make_unique<Vector<FrequentExitSite>>();
62 profile.m_frequentExitSites->append(site);
63 return true;
64 }
65
66 // Don't add it if it's already there. This is O(n), but that's OK, because we
67 // know that the total number of places where code exits tends to not be large,
68 // and this code is only used when recompilation is triggered.
69 for (unsigned i = 0; i < profile.m_frequentExitSites->size(); ++i) {
70 if (profile.m_frequentExitSites->at(i) == site)
71 return false;
72 }
73
74 profile.m_frequentExitSites->append(site);
75 return true;
76}
77
78Vector<FrequentExitSite> ExitProfile::exitSitesFor(unsigned bytecodeIndex)
79{
80 Vector<FrequentExitSite> result;
81
82 if (!m_frequentExitSites)
83 return result;
84
85 for (unsigned i = 0; i < m_frequentExitSites->size(); ++i) {
86 if (m_frequentExitSites->at(i).bytecodeOffset() == bytecodeIndex)
87 result.append(m_frequentExitSites->at(i));
88 }
89
90 return result;
91}
92
93bool ExitProfile::hasExitSite(const ConcurrentJSLocker&, const FrequentExitSite& site) const
94{
95 if (!m_frequentExitSites)
96 return false;
97
98 for (unsigned i = m_frequentExitSites->size(); i--;) {
99 if (site.subsumes(m_frequentExitSites->at(i)))
100 return true;
101 }
102 return false;
103}
104
105QueryableExitProfile::QueryableExitProfile() { }
106QueryableExitProfile::~QueryableExitProfile() { }
107
108void QueryableExitProfile::initialize(UnlinkedCodeBlock* unlinkedCodeBlock)
109{
110 ConcurrentJSLocker locker(unlinkedCodeBlock->m_lock);
111 const ExitProfile& profile = unlinkedCodeBlock->exitProfile();
112 if (!profile.m_frequentExitSites)
113 return;
114
115 for (unsigned i = 0; i < profile.m_frequentExitSites->size(); ++i)
116 m_frequentExitSites.add(profile.m_frequentExitSites->at(i));
117}
118
119} } // namespace JSC::DFG
120
121#endif
122