Source/JavaScriptCore/parser/VariableEnvironment.cpp - WebKit - Git at Google

 /*
  * Copyright (C) 2015 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 "VariableEnvironment.h"
 #include <wtf/CommaPrinter.h>
 #include <wtf/HexNumber.h>
 #include <wtf/text/UniquedStringImpl.h>

 namespace JSC {

 void VariableEnvironmentEntry::dump(PrintStream& out) const
 {
     out.print(hex(m_bits));
 }

 VariableEnvironment& VariableEnvironment::operator=(const VariableEnvironment& other)
 {
     VariableEnvironment env(other);
     swap(env);
     return *this;
 }

 void VariableEnvironment::markVariableAsCapturedIfDefined(const RefPtr<UniquedStringImpl>& identifier)
 {
     auto findResult = m_map.find(identifier);
     if (findResult != m_map.end())
         findResult->value.setIsCaptured();
 }

 void VariableEnvironment::markVariableAsCaptured(const RefPtr<UniquedStringImpl>& identifier)
 {
     auto findResult = m_map.find(identifier);
     RELEASE_ASSERT(findResult != m_map.end());
     findResult->value.setIsCaptured();
 }

 void VariableEnvironment::markAllVariablesAsCaptured()
 {
     if (m_isEverythingCaptured)
         return;

     m_isEverythingCaptured = true; // For fast queries.
     // We must mark every entry as captured for when we iterate through m_map and entry.isCaptured() is called.
     for (auto& value : m_map.values())
         value.setIsCaptured();
 }

 bool VariableEnvironment::hasCapturedVariables() const
 {
     if (m_isEverythingCaptured)
         return size() > 0;
     for (auto& value : m_map.values()) {
         if (value.isCaptured())
             return true;
     }
     return false;
 }

 bool VariableEnvironment::captures(UniquedStringImpl* identifier) const
 {
     if (m_isEverythingCaptured)
         return true;

     auto findResult = m_map.find(identifier);
     if (findResult == m_map.end())
         return false;
     return findResult->value.isCaptured();
 }

 void VariableEnvironment::swap(VariableEnvironment& other)
 {
     m_map.swap(other.m_map);
     m_isEverythingCaptured = other.m_isEverythingCaptured;
     m_rareData.swap(other.m_rareData);
 }

 void VariableEnvironment::markVariableAsImported(const RefPtr<UniquedStringImpl>& identifier)
 {
     auto findResult = m_map.find(identifier);
     RELEASE_ASSERT(findResult != m_map.end());
     findResult->value.setIsImported();
 }

 void VariableEnvironment::markVariableAsExported(const RefPtr<UniquedStringImpl>& identifier)
 {
     auto findResult = m_map.find(identifier);
     RELEASE_ASSERT(findResult != m_map.end());
     findResult->value.setIsExported();
 }

 VariableEnvironment::Map::AddResult VariableEnvironment::declarePrivateField(const RefPtr<UniquedStringImpl>& identifier)
 {
     getOrAddPrivateName(identifier.get());
     auto entry = VariableEnvironmentEntry();
     entry.setIsPrivateField();
     entry.setIsConst();
     entry.setIsCaptured();
     return m_map.add(identifier, entry);
 }

 VariableEnvironment::PrivateDeclarationResult VariableEnvironment::declarePrivateAccessor(const RefPtr<UniquedStringImpl>& identifier, PrivateNameEntry accessorTraits)
 {
     if (!m_rareData)
         m_rareData = WTF::makeUnique<VariableEnvironment::RareData>();

     auto findResult = m_rareData->m_privateNames.find(identifier);

     if (findResult == m_rareData->m_privateNames.end()) {
         PrivateNameEntry meta(accessorTraits.bits());

         auto entry = VariableEnvironmentEntry();
         if (accessorTraits.isSetter())
             entry.setIsPrivateSetter();
         else {
             ASSERT(accessorTraits.isGetter());
             entry.setIsPrivateGetter();
         }
         entry.setIsConst();
         entry.setIsCaptured();
         m_map.add(identifier, entry);

         m_rareData->m_privateNames.add(identifier, meta);
         return PrivateDeclarationResult::Success;
     }

     PrivateNameEntry currentEntry = findResult->value;
     if ((accessorTraits.isSetter() && !currentEntry.isGetter())
         || (accessorTraits.isGetter() && !currentEntry.isSetter()))
         return PrivateDeclarationResult::DuplicatedName;

     if (accessorTraits.isStatic() != currentEntry.isStatic())
         return PrivateDeclarationResult::InvalidStaticNonStatic;

     PrivateNameEntry meta(currentEntry.bits() | accessorTraits.bits());
     m_rareData->m_privateNames.set(identifier, meta);

     auto entryIterator = m_map.find(identifier);
     ASSERT(entryIterator != m_map.end());
     if (accessorTraits.isSetter())
         entryIterator->value.setIsPrivateSetter();
     else {
         ASSERT(accessorTraits.isGetter());
         entryIterator->value.setIsPrivateGetter();
     }

     return PrivateDeclarationResult::Success;
 }

 VariableEnvironment::PrivateDeclarationResult VariableEnvironment::declarePrivateSetter(const RefPtr<UniquedStringImpl>& identifier, PrivateNameEntry::Traits modifierTraits)
 {
     return declarePrivateAccessor(identifier, PrivateNameEntry(PrivateNameEntry::Traits::IsSetter | modifierTraits));
 }

 VariableEnvironment::PrivateDeclarationResult VariableEnvironment::declarePrivateGetter(const RefPtr<UniquedStringImpl>& identifier, PrivateNameEntry::Traits modifierTraits)
 {
     return declarePrivateAccessor(identifier, PrivateNameEntry(PrivateNameEntry::Traits::IsGetter | modifierTraits));
 }

 bool VariableEnvironment::declarePrivateMethod(const RefPtr<UniquedStringImpl>& identifier, PrivateNameEntry::Traits addionalTraits)
 {
     if (!m_rareData)
         m_rareData = makeUnique<VariableEnvironment::RareData>();

     auto findResult = m_rareData->m_privateNames.find(identifier);

     if (findResult == m_rareData->m_privateNames.end()) {
         PrivateNameEntry meta(PrivateNameEntry::Traits::IsMethod | addionalTraits);

         auto entry = VariableEnvironmentEntry();
         entry.setIsPrivateMethod();
         entry.setIsConst();
         entry.setIsCaptured();
         m_map.add(identifier, entry);

         auto addResult = m_rareData->m_privateNames.add(identifier, meta);
         return addResult.isNewEntry;
     }

     return false; // Error: declaring a duplicate private name.
 }

 void VariableEnvironment::dump(PrintStream& out) const
 {
     CommaPrinter comma(", ");
     for (auto& pair : m_map)
         out.print(comma, pair.key, " => ", pair.value);
 }

 void CompactTDZEnvironment::sortCompact(Compact& compact)
 {
     std::sort(compact.begin(), compact.end(), [] (auto& a, auto& b) {
         return a.get() < b.get();
     });
 }

 CompactTDZEnvironment::CompactTDZEnvironment(const TDZEnvironment& env)
 {
     Compact compactVariables;
     compactVariables.reserveCapacity(env.size());

     m_hash = 0; // Note: XOR is commutative so order doesn't matter here.
     for (auto& key : env) {
         compactVariables.append(key.get());
         m_hash ^= key->hash();
     }

     sortCompact(compactVariables);
     m_variables = WTFMove(compactVariables);
 }

 bool CompactTDZEnvironment::operator==(const CompactTDZEnvironment& other) const
 {
     if (this == &other)
         return true;

     if (m_hash != other.m_hash)
         return false;

     auto equal = [&] (const Compact& compact, const Inflated& inflated) {
         if (compact.size() != inflated.size())
             return false;
         for (auto& ident : compact) {
             if (!inflated.contains(ident))
                 return false;
         }
         return true;
     };

     bool result;
     WTF::switchOn(m_variables,
         [&] (const Compact& compact) {
             WTF::switchOn(other.m_variables,
                 [&] (const Compact& otherCompact) {
                     result = compact == otherCompact;
                 },
                 [&] (const Inflated& otherInflated) {
                     result = equal(compact, otherInflated);
                 });
         },
         [&] (const Inflated& inflated) {
             WTF::switchOn(other.m_variables,
                 [&] (const Compact& otherCompact) {
                     result = equal(otherCompact, inflated);
                 },
                 [&] (const Inflated& otherInflated) {
                     result = inflated == otherInflated;
                 });
         });

     return result;
 }

 TDZEnvironment& CompactTDZEnvironment::toTDZEnvironmentSlow() const
 {
     Inflated inflated;
     {
         auto& compact = std::get<Compact>(m_variables);
         for (size_t i = 0; i < compact.size(); ++i) {
             auto addResult = inflated.add(compact[i]);
             ASSERT_UNUSED(addResult, addResult.isNewEntry);
         }
     }
     m_variables = Variables(WTFMove(inflated));
     return const_cast<Inflated&>(std::get<Inflated>(m_variables));
 }

 CompactTDZEnvironmentMap::Handle CompactTDZEnvironmentMap::get(const TDZEnvironment& env)
 {
     auto* environment = new CompactTDZEnvironment(env);
     bool isNewEntry;
     auto handle = get(environment, isNewEntry);
     if (!isNewEntry)
         delete environment;
     return handle;
 }

 CompactTDZEnvironmentMap::Handle CompactTDZEnvironmentMap::get(CompactTDZEnvironment* environment, bool& isNewEntry)
 {
     CompactTDZEnvironmentKey key { *environment };
     auto addResult = m_map.add(key, 1);
     isNewEntry = addResult.isNewEntry;
     if (addResult.isNewEntry)
         return CompactTDZEnvironmentMap::Handle(*environment, *this);

     ++addResult.iterator->value;
     return CompactTDZEnvironmentMap::Handle(addResult.iterator->key.environment(), *this);
 }

 CompactTDZEnvironmentMap::Handle::~Handle()
 {
     if (!m_map) {
         ASSERT(!m_environment);
         // This happens if we were moved into a different handle.
         return;
     }

     RELEASE_ASSERT(m_environment);
     auto iter = m_map->m_map.find(CompactTDZEnvironmentKey { *m_environment });
     RELEASE_ASSERT(iter != m_map->m_map.end());
     --iter->value;
     if (!iter->value) {
         ASSERT(m_environment == &iter->key.environment());
         m_map->m_map.remove(iter);
         delete m_environment;
     }
 }

 CompactTDZEnvironmentMap::Handle::Handle(const CompactTDZEnvironmentMap::Handle& other)
     : m_environment(other.m_environment)
     , m_map(other.m_map)
 {
     if (m_map) {
         auto iter = m_map->m_map.find(CompactTDZEnvironmentKey { *m_environment });
         RELEASE_ASSERT(iter != m_map->m_map.end());
         ++iter->value;
     }
 }

 CompactTDZEnvironmentMap::Handle::Handle(CompactTDZEnvironment& environment, CompactTDZEnvironmentMap& map)
     : m_environment(&environment)
     , m_map(&map)
 {
 }

 } // namespace JSC
	/*
	* Copyright (C) 2015 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 "VariableEnvironment.h"
	#include <wtf/CommaPrinter.h>
	#include <wtf/HexNumber.h>
	#include <wtf/text/UniquedStringImpl.h>

	namespace JSC {

	void VariableEnvironmentEntry::dump(PrintStream& out) const
	{
	out.print(hex(m_bits));
	}

	VariableEnvironment& VariableEnvironment::operator=(const VariableEnvironment& other)
	{
	VariableEnvironment env(other);
	swap(env);
	return *this;
	}

	void VariableEnvironment::markVariableAsCapturedIfDefined(const RefPtr<UniquedStringImpl>& identifier)
	{
	auto findResult = m_map.find(identifier);
	if (findResult != m_map.end())
	findResult->value.setIsCaptured();
	}

	void VariableEnvironment::markVariableAsCaptured(const RefPtr<UniquedStringImpl>& identifier)
	{
	auto findResult = m_map.find(identifier);
	RELEASE_ASSERT(findResult != m_map.end());
	findResult->value.setIsCaptured();
	}

	void VariableEnvironment::markAllVariablesAsCaptured()
	{
	if (m_isEverythingCaptured)
	return;

	m_isEverythingCaptured = true; // For fast queries.
	// We must mark every entry as captured for when we iterate through m_map and entry.isCaptured() is called.
	for (auto& value : m_map.values())
	value.setIsCaptured();
	}

	bool VariableEnvironment::hasCapturedVariables() const
	{
	if (m_isEverythingCaptured)
	return size() > 0;
	for (auto& value : m_map.values()) {
	if (value.isCaptured())
	return true;
	}
	return false;
	}

	bool VariableEnvironment::captures(UniquedStringImpl* identifier) const
	{
	if (m_isEverythingCaptured)
	return true;

	auto findResult = m_map.find(identifier);
	if (findResult == m_map.end())
	return false;
	return findResult->value.isCaptured();
	}

	void VariableEnvironment::swap(VariableEnvironment& other)
	{
	m_map.swap(other.m_map);
	m_isEverythingCaptured = other.m_isEverythingCaptured;
	m_rareData.swap(other.m_rareData);
	}

	void VariableEnvironment::markVariableAsImported(const RefPtr<UniquedStringImpl>& identifier)
	{
	auto findResult = m_map.find(identifier);
	RELEASE_ASSERT(findResult != m_map.end());
	findResult->value.setIsImported();
	}

	void VariableEnvironment::markVariableAsExported(const RefPtr<UniquedStringImpl>& identifier)
	{
	auto findResult = m_map.find(identifier);
	RELEASE_ASSERT(findResult != m_map.end());
	findResult->value.setIsExported();
	}

	VariableEnvironment::Map::AddResult VariableEnvironment::declarePrivateField(const RefPtr<UniquedStringImpl>& identifier)
	{
	getOrAddPrivateName(identifier.get());
	auto entry = VariableEnvironmentEntry();
	entry.setIsPrivateField();
	entry.setIsConst();
	entry.setIsCaptured();
	return m_map.add(identifier, entry);
	}

	VariableEnvironment::PrivateDeclarationResult VariableEnvironment::declarePrivateAccessor(const RefPtr<UniquedStringImpl>& identifier, PrivateNameEntry accessorTraits)
	{
	if (!m_rareData)
	m_rareData = WTF::makeUnique<VariableEnvironment::RareData>();

	auto findResult = m_rareData->m_privateNames.find(identifier);

	if (findResult == m_rareData->m_privateNames.end()) {
	PrivateNameEntry meta(accessorTraits.bits());

	auto entry = VariableEnvironmentEntry();
	if (accessorTraits.isSetter())
	entry.setIsPrivateSetter();
	else {
	ASSERT(accessorTraits.isGetter());
	entry.setIsPrivateGetter();
	}
	entry.setIsConst();
	entry.setIsCaptured();
	m_map.add(identifier, entry);

	m_rareData->m_privateNames.add(identifier, meta);
	return PrivateDeclarationResult::Success;
	}

	PrivateNameEntry currentEntry = findResult->value;
	if ((accessorTraits.isSetter() && !currentEntry.isGetter())
	\|\| (accessorTraits.isGetter() && !currentEntry.isSetter()))
	return PrivateDeclarationResult::DuplicatedName;

	if (accessorTraits.isStatic() != currentEntry.isStatic())
	return PrivateDeclarationResult::InvalidStaticNonStatic;

	PrivateNameEntry meta(currentEntry.bits() \| accessorTraits.bits());
	m_rareData->m_privateNames.set(identifier, meta);

	auto entryIterator = m_map.find(identifier);
	ASSERT(entryIterator != m_map.end());
	if (accessorTraits.isSetter())
	entryIterator->value.setIsPrivateSetter();
	else {
	ASSERT(accessorTraits.isGetter());
	entryIterator->value.setIsPrivateGetter();
	}

	return PrivateDeclarationResult::Success;
	}

	VariableEnvironment::PrivateDeclarationResult VariableEnvironment::declarePrivateSetter(const RefPtr<UniquedStringImpl>& identifier, PrivateNameEntry::Traits modifierTraits)
	{
	return declarePrivateAccessor(identifier, PrivateNameEntry(PrivateNameEntry::Traits::IsSetter \| modifierTraits));
	}

	VariableEnvironment::PrivateDeclarationResult VariableEnvironment::declarePrivateGetter(const RefPtr<UniquedStringImpl>& identifier, PrivateNameEntry::Traits modifierTraits)
	{
	return declarePrivateAccessor(identifier, PrivateNameEntry(PrivateNameEntry::Traits::IsGetter \| modifierTraits));
	}

	bool VariableEnvironment::declarePrivateMethod(const RefPtr<UniquedStringImpl>& identifier, PrivateNameEntry::Traits addionalTraits)
	{
	if (!m_rareData)
	m_rareData = makeUnique<VariableEnvironment::RareData>();

	auto findResult = m_rareData->m_privateNames.find(identifier);

	if (findResult == m_rareData->m_privateNames.end()) {
	PrivateNameEntry meta(PrivateNameEntry::Traits::IsMethod \| addionalTraits);

	auto entry = VariableEnvironmentEntry();
	entry.setIsPrivateMethod();
	entry.setIsConst();
	entry.setIsCaptured();
	m_map.add(identifier, entry);

	auto addResult = m_rareData->m_privateNames.add(identifier, meta);
	return addResult.isNewEntry;
	}

	return false; // Error: declaring a duplicate private name.
	}

	void VariableEnvironment::dump(PrintStream& out) const
	{
	CommaPrinter comma(", ");
	for (auto& pair : m_map)
	out.print(comma, pair.key, " => ", pair.value);
	}

	void CompactTDZEnvironment::sortCompact(Compact& compact)
	{
	std::sort(compact.begin(), compact.end(), [] (auto& a, auto& b) {
	return a.get() < b.get();
	});
	}

	CompactTDZEnvironment::CompactTDZEnvironment(const TDZEnvironment& env)
	{
	Compact compactVariables;
	compactVariables.reserveCapacity(env.size());

	m_hash = 0; // Note: XOR is commutative so order doesn't matter here.
	for (auto& key : env) {
	compactVariables.append(key.get());
	m_hash ^= key->hash();
	}

	sortCompact(compactVariables);
	m_variables = WTFMove(compactVariables);
	}

	bool CompactTDZEnvironment::operator==(const CompactTDZEnvironment& other) const
	{
	if (this == &other)
	return true;

	if (m_hash != other.m_hash)
	return false;

	auto equal = [&] (const Compact& compact, const Inflated& inflated) {
	if (compact.size() != inflated.size())
	return false;
	for (auto& ident : compact) {
	if (!inflated.contains(ident))
	return false;
	}
	return true;
	};

	bool result;
	WTF::switchOn(m_variables,
	[&] (const Compact& compact) {
	WTF::switchOn(other.m_variables,
	[&] (const Compact& otherCompact) {
	result = compact == otherCompact;
	},
	[&] (const Inflated& otherInflated) {
	result = equal(compact, otherInflated);
	});
	},
	[&] (const Inflated& inflated) {
	WTF::switchOn(other.m_variables,
	[&] (const Compact& otherCompact) {
	result = equal(otherCompact, inflated);
	},
	[&] (const Inflated& otherInflated) {
	result = inflated == otherInflated;
	});
	});

	return result;
	}

	TDZEnvironment& CompactTDZEnvironment::toTDZEnvironmentSlow() const
	{
	Inflated inflated;
	{
	auto& compact = std::get<Compact>(m_variables);
	for (size_t i = 0; i < compact.size(); ++i) {
	auto addResult = inflated.add(compact[i]);
	ASSERT_UNUSED(addResult, addResult.isNewEntry);
	}
	}
	m_variables = Variables(WTFMove(inflated));
	return const_cast<Inflated&>(std::get<Inflated>(m_variables));
	}

	CompactTDZEnvironmentMap::Handle CompactTDZEnvironmentMap::get(const TDZEnvironment& env)
	{
	auto* environment = new CompactTDZEnvironment(env);
	bool isNewEntry;
	auto handle = get(environment, isNewEntry);
	if (!isNewEntry)
	delete environment;
	return handle;
	}

	CompactTDZEnvironmentMap::Handle CompactTDZEnvironmentMap::get(CompactTDZEnvironment* environment, bool& isNewEntry)
	{
	CompactTDZEnvironmentKey key { *environment };
	auto addResult = m_map.add(key, 1);
	isNewEntry = addResult.isNewEntry;
	if (addResult.isNewEntry)
	return CompactTDZEnvironmentMap::Handle(environment, this);

	++addResult.iterator->value;
	return CompactTDZEnvironmentMap::Handle(addResult.iterator->key.environment(), *this);
	}

	CompactTDZEnvironmentMap::Handle::~Handle()
	{
	if (!m_map) {
	ASSERT(!m_environment);
	// This happens if we were moved into a different handle.
	return;
	}

	RELEASE_ASSERT(m_environment);
	auto iter = m_map->m_map.find(CompactTDZEnvironmentKey { *m_environment });
	RELEASE_ASSERT(iter != m_map->m_map.end());
	--iter->value;
	if (!iter->value) {
	ASSERT(m_environment == &iter->key.environment());
	m_map->m_map.remove(iter);
	delete m_environment;
	}
	}

	CompactTDZEnvironmentMap::Handle::Handle(const CompactTDZEnvironmentMap::Handle& other)
	: m_environment(other.m_environment)
	, m_map(other.m_map)
	{
	if (m_map) {
	auto iter = m_map->m_map.find(CompactTDZEnvironmentKey { *m_environment });
	RELEASE_ASSERT(iter != m_map->m_map.end());
	++iter->value;
	}
	}

	CompactTDZEnvironmentMap::Handle::Handle(CompactTDZEnvironment& environment, CompactTDZEnvironmentMap& map)
	: m_environment(&environment)
	, m_map(&map)
	{
	}

	} // namespace JSC