JavaScriptCore-1097.3.tar.gz

[apple/javascriptcore.git] / wtf / WTFThreadData.h

diff --git a/wtf/WTFThreadData.h b/wtf/WTFThreadData.h
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--- a/wtf/WTFThreadData.h
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-/*
- * Copyright (C) 2008 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 COMPUTER, 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 COMPUTER, 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. 
- *
- */
-
-#ifndef WTFThreadData_h
-#define WTFThreadData_h
-
-#include <wtf/HashMap.h>
-#include <wtf/HashSet.h>
-#include <wtf/Noncopyable.h>
-#include <wtf/StackBounds.h>
-#include <wtf/text/StringHash.h>
-
-// This was ENABLE(WORKERS) in WebCore, but this is not defined when compiling JSC.
-// However this check was not correct anyway, re this comment:
-//    // FIXME: Workers are not necessarily the only feature that make per-thread global data necessary.
-//    // We need to check for e.g. database objects manipulating strings on secondary threads.
-// Always enabling this is safe, and should be a better option until we can come up
-// with a better define.
-#define WTFTHREADDATA_MULTITHREADED 1
-
-#if WTFTHREADDATA_MULTITHREADED
-#include <wtf/ThreadSpecific.h>
-#include <wtf/Threading.h>
-#endif
-
-#if USE(JSC)
-// FIXME: This is a temporary layering violation while we move more string code to WTF.
-namespace JSC {
-
-typedef HashMap<const char*, RefPtr<StringImpl>, PtrHash<const char*> > LiteralIdentifierTable;
-
-class IdentifierTable {
-    WTF_MAKE_FAST_ALLOCATED;
-public:
-    ~IdentifierTable();
-
-    std::pair<HashSet<StringImpl*>::iterator, bool> add(StringImpl* value);
-    template<typename U, typename V>
-    std::pair<HashSet<StringImpl*>::iterator, bool> add(U value);
-
-    bool remove(StringImpl* r)
-    {
-        HashSet<StringImpl*>::iterator iter = m_table.find(r);
-        if (iter == m_table.end())
-            return false;
-        m_table.remove(iter);
-        return true;
-    }
-
-    LiteralIdentifierTable& literalTable() { return m_literalTable; }
-
-private:
-    HashSet<StringImpl*> m_table;
-    LiteralIdentifierTable m_literalTable;
-};
-
-}
-#endif
-
-namespace WTF {
-
-class AtomicStringTable;
-
-typedef void (*AtomicStringTableDestructor)(AtomicStringTable*);
-
-class WTFThreadData {
-    WTF_MAKE_NONCOPYABLE(WTFThreadData);
-public:
-    WTFThreadData();
-    ~WTFThreadData();
-
-    AtomicStringTable* atomicStringTable()
-    {
-        return m_atomicStringTable;
-    }
-
-#if USE(JSC)
-    JSC::IdentifierTable* currentIdentifierTable()
-    {
-        return m_currentIdentifierTable;
-    }
-
-    JSC::IdentifierTable* setCurrentIdentifierTable(JSC::IdentifierTable* identifierTable)
-    {
-        JSC::IdentifierTable* oldIdentifierTable = m_currentIdentifierTable;
-        m_currentIdentifierTable = identifierTable;
-        return oldIdentifierTable;
-    }
-
-    void resetCurrentIdentifierTable()
-    {
-        m_currentIdentifierTable = m_defaultIdentifierTable;
-    }
-
-    const StackBounds& stack() const
-    {
-        return m_stackBounds;
-    }
-#endif
-
-private:
-    AtomicStringTable* m_atomicStringTable;
-    AtomicStringTableDestructor m_atomicStringTableDestructor;
-
-#if USE(JSC)
-    JSC::IdentifierTable* m_defaultIdentifierTable;
-    JSC::IdentifierTable* m_currentIdentifierTable;
-    StackBounds m_stackBounds;
-#endif
-
-#if WTFTHREADDATA_MULTITHREADED
-    static JS_EXPORTDATA ThreadSpecific<WTFThreadData>* staticData;
-#else
-    static JS_EXPORTDATA WTFThreadData* staticData;
-#endif
-    friend WTFThreadData& wtfThreadData();
-    friend class AtomicStringTable;
-};
-
-inline WTFThreadData& wtfThreadData()
-{
-#if WTFTHREADDATA_MULTITHREADED
-    // WRT WebCore:
-    //    WTFThreadData is used on main thread before it could possibly be used
-    //    on secondary ones, so there is no need for synchronization here.
-    // WRT JavaScriptCore:
-    //    wtfThreadData() is initially called from initializeThreading(), ensuring
-    //    this is initially called in a pthread_once locked context.
-    if (!WTFThreadData::staticData)
-        WTFThreadData::staticData = new ThreadSpecific<WTFThreadData>;
-    return **WTFThreadData::staticData;
-#else
-    if (!WTFThreadData::staticData) {
-        WTFThreadData::staticData = static_cast<WTFThreadData*>(fastMalloc(sizeof(WTFThreadData)));
-        // WTFThreadData constructor indirectly uses staticData, so we need to set up the memory before invoking it.
-        new (WTFThreadData::staticData) WTFThreadData;
-    }
-    return *WTFThreadData::staticData;
-#endif
-}
-
-} // namespace WTF
-
-using WTF::WTFThreadData;
-using WTF::wtfThreadData;
-
-#endif // WTFThreadData_h