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DFGExitProfile.cpp
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120 lines (95 loc) · 4.15 KB
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/*
* Copyright (C) 2011, 2016 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "DFGExitProfile.h"
#if ENABLE(DFG_JIT)
#include "CodeBlock.h"
#include "VMInlines.h"
namespace JSC { namespace DFG {
void FrequentExitSite::dump(PrintStream& out) const
{
out.print(m_bytecodeIndex, ": ", m_kind, "/", m_jitType, "/", m_inlineKind);
}
ExitProfile::ExitProfile() = default;
ExitProfile::~ExitProfile() = default;
bool ExitProfile::add(CodeBlock* owner, const FrequentExitSite& site)
{
RELEASE_ASSERT(site.jitType() != ExitFromAnything);
RELEASE_ASSERT(site.inlineKind() != ExitFromAnyInlineKind);
ConcurrentJSLocker locker(owner->unlinkedCodeBlock()->m_lock);
CODEBLOCK_LOG_EVENT(owner, "frequentExit", (site));
dataLogLnIf(Options::verboseExitProfile(), pointerDump(owner), ": Adding exit site: ", site);
ExitProfile& profile = owner->unlinkedCodeBlock()->exitProfile();
// If we've never seen any frequent exits then create the list and put this site
// into it.
if (!profile.m_frequentExitSites) {
profile.m_frequentExitSites = makeUnique<Vector<FrequentExitSite>>();
profile.m_frequentExitSites->append(site);
return true;
}
// Don't add it if it's already there. This is O(n), but that's OK, because we
// know that the total number of places where code exits tends to not be large,
// and this code is only used when recompilation is triggered.
for (unsigned i = 0; i < profile.m_frequentExitSites->size(); ++i) {
if (profile.m_frequentExitSites->at(i) == site)
return false;
}
profile.m_frequentExitSites->append(site);
return true;
}
Vector<FrequentExitSite> ExitProfile::exitSitesFor(BytecodeIndex bytecodeIndex)
{
Vector<FrequentExitSite> result;
if (!m_frequentExitSites)
return result;
for (unsigned i = 0; i < m_frequentExitSites->size(); ++i) {
if (m_frequentExitSites->at(i).bytecodeIndex() == bytecodeIndex)
result.append(m_frequentExitSites->at(i));
}
return result;
}
bool ExitProfile::hasExitSite(const ConcurrentJSLocker&, const FrequentExitSite& site) const
{
if (!m_frequentExitSites)
return false;
for (unsigned i = m_frequentExitSites->size(); i--;) {
if (site.subsumes(m_frequentExitSites->at(i)))
return true;
}
return false;
}
QueryableExitProfile::QueryableExitProfile() = default;
QueryableExitProfile::~QueryableExitProfile() = default;
void QueryableExitProfile::initialize(UnlinkedCodeBlock* unlinkedCodeBlock)
{
ConcurrentJSLocker locker(unlinkedCodeBlock->m_lock);
const ExitProfile& profile = unlinkedCodeBlock->exitProfile();
if (!profile.m_frequentExitSites)
return;
for (unsigned i = 0; i < profile.m_frequentExitSites->size(); ++i)
m_frequentExitSites.add(profile.m_frequentExitSites->at(i));
}
} } // namespace JSC::DFG
#endif