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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/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 : public FastAllocBase {
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);
void remove(StringImpl* r) { m_table.remove(r); }
LiteralIdentifierTable& literalTable() { return m_literalTable; }
private:
HashSet<StringImpl*> m_table;
LiteralIdentifierTable m_literalTable;
};
}
#endif
namespace WTF {
class AtomicStringTable;
typedef void (*AtomicStringTableDestructor)(AtomicStringTable*);
class WTFThreadData : public Noncopyable {
public:
WTFThreadData();
~WTFThreadData();
AtomicStringTable* atomicStringTable()
{
return m_atomicStringTable;
}
#if USE(JSC)
void initializeIdentifierTable(JSC::IdentifierTable* identifierTable)
{
m_defaultIdentifierTable = identifierTable;
m_currentIdentifierTable = identifierTable;
}
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;
}
#endif
char* approximatedStackStart() const
{
return m_approximatedStackStart;
}
private:
AtomicStringTable* m_atomicStringTable;
AtomicStringTableDestructor m_atomicStringTableDestructor;
#if USE(JSC)
JSC::IdentifierTable* m_defaultIdentifierTable;
JSC::IdentifierTable* m_currentIdentifierTable;
#endif
#if WTFTHREADDATA_MULTITHREADED
static JS_EXPORTDATA ThreadSpecific<WTFThreadData>* staticData;
#else
static JS_EXPORTDATA WTFThreadData* staticData;
#endif
friend WTFThreadData& wtfThreadData();
friend class AtomicStringTable;
char* m_approximatedStackStart;
};
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
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