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/*
* Copyright (C) 2009, 2010 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.
*/
#ifndef RopeImpl_h
#define RopeImpl_h
#include <wtf/text/StringImpl.h>
namespace JSC {
class RopeImpl : public StringImplBase {
public:
// A RopeImpl is composed from a set of smaller strings called Fibers.
// Each Fiber in a rope is either StringImpl or another RopeImpl.
typedef StringImplBase* Fiber;
// Creates a RopeImpl comprising of 'fiberCount' Fibers.
// The RopeImpl is constructed in an uninitialized state - initialize must be called for each Fiber in the RopeImpl.
static PassRefPtr<RopeImpl> tryCreateUninitialized(unsigned fiberCount)
{
void* allocation;
if (tryFastMalloc(sizeof(RopeImpl) + (fiberCount - 1) * sizeof(Fiber)).getValue(allocation))
return adoptRef(new (allocation) RopeImpl(fiberCount));
return 0;
}
static bool isRope(Fiber fiber)
{
return !fiber->isStringImpl();
}
static void deref(Fiber fiber)
{
if (isRope(fiber))
static_cast<RopeImpl*>(fiber)->deref();
else
static_cast<StringImpl*>(fiber)->deref();
}
void initializeFiber(unsigned &index, Fiber fiber)
{
m_fibers[index++] = fiber;
fiber->ref();
m_length += fiber->length();
}
unsigned fiberCount() { return m_size; }
Fiber* fibers() { return m_fibers; }
ALWAYS_INLINE void deref()
{
--m_refCount;
if (!m_refCount)
destructNonRecursive();
}
private:
RopeImpl(unsigned fiberCount)
: StringImplBase(ConstructNonStringImpl)
, m_size(fiberCount)
{
}
void destructNonRecursive();
void derefFibersNonRecursive(Vector<RopeImpl*, 32>& workQueue);
bool hasOneRef() { return m_refCount == 1; }
unsigned m_size;
Fiber m_fibers[1];
};
}
#endif
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