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DFGExitProfile.h
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247 lines (205 loc) · 8.29 KB
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/*
* Copyright (C) 2011-2019 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.
*/
#pragma once
#if ENABLE(DFG_JIT)
#include "ConcurrentJSLock.h"
#include "ExitKind.h"
#include "ExitingInlineKind.h"
#include "ExitingJITType.h"
#include <wtf/HashSet.h>
#include <wtf/Vector.h>
namespace JSC { namespace DFG {
class FrequentExitSite {
public:
FrequentExitSite()
: m_bytecodeIndex(BytecodeIndex(0))
, m_kind(ExitKindUnset)
, m_jitType(ExitFromAnything)
, m_inlineKind(ExitFromAnyInlineKind)
{
}
FrequentExitSite(WTF::HashTableDeletedValueType)
: m_bytecodeIndex(WTF::HashTableDeletedValue)
, m_kind(ExitKindUnset)
, m_jitType(ExitFromAnything)
, m_inlineKind(ExitFromAnyInlineKind)
{
}
explicit FrequentExitSite(BytecodeIndex bytecodeIndex, ExitKind kind, ExitingJITType jitType = ExitFromAnything, ExitingInlineKind inlineKind = ExitFromAnyInlineKind)
: m_bytecodeIndex(bytecodeIndex)
, m_kind(kind)
, m_jitType(jitType)
, m_inlineKind(inlineKind)
{
if (m_kind == ArgumentsEscaped) {
// Count this one globally. It doesn't matter where in the code block the arguments excaped;
// the fact that they did is not associated with any particular instruction.
m_bytecodeIndex = BytecodeIndex(0);
}
}
// Use this constructor if you wish for the exit site to be counted globally within its
// code block.
explicit FrequentExitSite(ExitKind kind, ExitingJITType jitType = ExitFromAnything, ExitingInlineKind inlineKind = ExitFromAnyInlineKind)
: m_bytecodeIndex(BytecodeIndex(0))
, m_kind(kind)
, m_jitType(jitType)
, m_inlineKind(inlineKind)
{
}
bool operator!() const
{
return m_kind == ExitKindUnset;
}
bool operator==(const FrequentExitSite& other) const
{
return m_bytecodeIndex == other.m_bytecodeIndex
&& m_kind == other.m_kind
&& m_jitType == other.m_jitType
&& m_inlineKind == other.m_inlineKind;
}
bool subsumes(const FrequentExitSite& other) const
{
if (m_bytecodeIndex != other.m_bytecodeIndex)
return false;
if (m_kind != other.m_kind)
return false;
if (m_jitType != ExitFromAnything
&& m_jitType != other.m_jitType)
return false;
if (m_inlineKind != ExitFromAnyInlineKind
&& m_inlineKind != other.m_inlineKind)
return false;
return true;
}
unsigned hash() const
{
return m_bytecodeIndex.hash() + m_kind + static_cast<unsigned>(m_jitType) * 7 + static_cast<unsigned>(m_inlineKind) * 11;
}
BytecodeIndex bytecodeIndex() const { return m_bytecodeIndex; }
ExitKind kind() const { return m_kind; }
ExitingJITType jitType() const { return m_jitType; }
ExitingInlineKind inlineKind() const { return m_inlineKind; }
FrequentExitSite withJITType(ExitingJITType jitType) const
{
FrequentExitSite result = *this;
result.m_jitType = jitType;
return result;
}
FrequentExitSite withInlineKind(ExitingInlineKind inlineKind) const
{
FrequentExitSite result = *this;
result.m_inlineKind = inlineKind;
return result;
}
bool isHashTableDeletedValue() const
{
return m_kind == ExitKindUnset && m_bytecodeIndex.isHashTableDeletedValue();
}
void dump(PrintStream& out) const;
private:
BytecodeIndex m_bytecodeIndex;
ExitKind m_kind;
ExitingJITType m_jitType;
ExitingInlineKind m_inlineKind;
};
struct FrequentExitSiteHash {
static unsigned hash(const FrequentExitSite& key) { return key.hash(); }
static bool equal(const FrequentExitSite& a, const FrequentExitSite& b) { return a == b; }
static constexpr bool safeToCompareToEmptyOrDeleted = true;
};
} } // namespace JSC::DFG
namespace WTF {
template<typename T> struct DefaultHash;
template<> struct DefaultHash<JSC::DFG::FrequentExitSite> : JSC::DFG::FrequentExitSiteHash { };
template<typename T> struct HashTraits;
template<> struct HashTraits<JSC::DFG::FrequentExitSite> : SimpleClassHashTraits<JSC::DFG::FrequentExitSite> { };
} // namespace WTF
namespace JSC { namespace DFG {
class QueryableExitProfile;
class ExitProfile {
public:
ExitProfile();
~ExitProfile();
// Add a new frequent exit site. Return true if this is a new one, or false
// if we already knew about it. This is an O(n) operation, because it errs
// on the side of keeping the data structure compact. Also, this will only
// be called a fixed number of times per recompilation. Recompilation is
// rare to begin with, and implies doing O(n) operations on the CodeBlock
// anyway.
static bool add(CodeBlock*, const FrequentExitSite&);
// Get the frequent exit sites for a bytecode index. This is O(n), and is
// meant to only be used from debugging/profiling code.
Vector<FrequentExitSite> exitSitesFor(BytecodeIndex);
// This is O(n) and should be called on less-frequently executed code paths
// in the compiler. It should be strictly cheaper than building a
// QueryableExitProfile, if you really expect this to be called infrequently
// and you believe that there are few exit sites.
bool hasExitSite(const ConcurrentJSLocker&, const FrequentExitSite&) const;
bool hasExitSite(const ConcurrentJSLocker& locker, ExitKind kind) const
{
return hasExitSite(locker, FrequentExitSite(kind));
}
private:
friend class QueryableExitProfile;
std::unique_ptr<Vector<FrequentExitSite>> m_frequentExitSites;
};
class QueryableExitProfile {
public:
QueryableExitProfile();
~QueryableExitProfile();
void initialize(UnlinkedCodeBlock*);
bool hasExitSite(const FrequentExitSite& site) const
{
if (site.jitType() == ExitFromAnything) {
return hasExitSiteWithSpecificJITType(site.withJITType(ExitFromDFG))
|| hasExitSiteWithSpecificJITType(site.withJITType(ExitFromFTL));
}
return hasExitSiteWithSpecificJITType(site);
}
bool hasExitSite(ExitKind kind) const
{
return hasExitSite(FrequentExitSite(kind));
}
bool hasExitSite(BytecodeIndex bytecodeIndex, ExitKind kind) const
{
return hasExitSite(FrequentExitSite(bytecodeIndex, kind));
}
private:
bool hasExitSiteWithSpecificJITType(const FrequentExitSite& site) const
{
if (site.inlineKind() == ExitFromAnyInlineKind) {
return hasExitSiteWithSpecificInlineKind(site.withInlineKind(ExitFromNotInlined))
|| hasExitSiteWithSpecificInlineKind(site.withInlineKind(ExitFromInlined));
}
return hasExitSiteWithSpecificInlineKind(site);
}
bool hasExitSiteWithSpecificInlineKind(const FrequentExitSite& site) const
{
return m_frequentExitSites.find(site) != m_frequentExitSites.end();
}
HashSet<FrequentExitSite> m_frequentExitSites;
};
} } // namespace JSC::DFG
#endif // ENABLE(DFG_JIT)