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* Copyright (C) 2008 Apple Inc. All Rights Reserved.
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#ifndef WTFThreadData_h
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#define WTFThreadData_h
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#include <wtf/HashMap.h>
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#include <wtf/HashSet.h>
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#include <wtf/Noncopyable.h>
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#include <wtf/StackBounds.h>
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#include <wtf/StackStats.h>
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#include <wtf/text/StringHash.h>
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#include <wtf/ThreadSpecific.h>
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#include <wtf/Threading.h>
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// FIXME: This is a temporary layering violation while we move more string code to WTF.
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typedef HashMap<const char*, RefPtr<StringImpl>, PtrHash<const char*> > LiteralIdentifierTable;
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class IdentifierTable {
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WTF_MAKE_FAST_ALLOCATED;
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HashSet<StringImpl*>::AddResult add(StringImpl* value);
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template<typename U, typename V>
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HashSet<StringImpl*>::AddResult add(U value);
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bool remove(StringImpl* r)
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HashSet<StringImpl*>::iterator iter = m_table.find(r);
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if (iter == m_table.end())
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LiteralIdentifierTable& literalTable() { return m_literalTable; }
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HashSet<StringImpl*> m_table;
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LiteralIdentifierTable m_literalTable;
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class AtomicStringTable;
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typedef void (*AtomicStringTableDestructor)(AtomicStringTable*);
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WTF_MAKE_NONCOPYABLE(WTFThreadData);
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WTF_EXPORT_PRIVATE WTFThreadData();
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WTF_EXPORT_PRIVATE ~WTFThreadData();
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AtomicStringTable* atomicStringTable()
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return m_atomicStringTable;
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JSC::IdentifierTable* currentIdentifierTable()
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return m_currentIdentifierTable;
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JSC::IdentifierTable* setCurrentIdentifierTable(JSC::IdentifierTable* identifierTable)
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JSC::IdentifierTable* oldIdentifierTable = m_currentIdentifierTable;
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m_currentIdentifierTable = identifierTable;
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return oldIdentifierTable;
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void resetCurrentIdentifierTable()
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m_currentIdentifierTable = m_defaultIdentifierTable;
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const StackBounds& stack()
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// We need to always get a fresh StackBounds from the OS due to how fibers work.
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// See https://bugs.webkit.org/show_bug.cgi?id=102411
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m_stackBounds = StackBounds::currentThreadStackBounds();
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return m_stackBounds;
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#if ENABLE(STACK_STATS)
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StackStats::PerThreadStats& stackStats()
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AtomicStringTable* m_atomicStringTable;
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AtomicStringTableDestructor m_atomicStringTableDestructor;
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JSC::IdentifierTable* m_defaultIdentifierTable;
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JSC::IdentifierTable* m_currentIdentifierTable;
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StackBounds m_stackBounds;
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#if ENABLE(STACK_STATS)
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StackStats::PerThreadStats m_stackStats;
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static WTF_EXPORTDATA ThreadSpecific<WTFThreadData>* staticData;
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friend WTFThreadData& wtfThreadData();
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friend class AtomicStringTable;
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inline WTFThreadData& wtfThreadData()
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// WTFThreadData is used on main thread before it could possibly be used
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// on secondary ones, so there is no need for synchronization here.
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// WRT JavaScriptCore:
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// wtfThreadData() is initially called from initializeThreading(), ensuring
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// this is initially called in a pthread_once locked context.
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if (!WTFThreadData::staticData)
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WTFThreadData::staticData = new ThreadSpecific<WTFThreadData>;
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return **WTFThreadData::staticData;
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using WTF::WTFThreadData;
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using WTF::wtfThreadData;
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#endif // WTFThreadData_h