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/*
* Copyright (C) 2009 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 ParserArena_h
#define ParserArena_h
#include "Identifier.h"
#include <wtf/SegmentedVector.h>
namespace JSC {
class ParserArenaDeletable;
class ParserArenaRefCounted;
class IdentifierArena {
WTF_MAKE_FAST_ALLOCATED;
public:
ALWAYS_INLINE const Identifier& makeIdentifier(JSGlobalData*, const UChar* characters, size_t length);
const Identifier& makeNumericIdentifier(JSGlobalData*, double number);
void clear() { m_identifiers.clear(); }
bool isEmpty() const { return m_identifiers.isEmpty(); }
private:
typedef SegmentedVector<Identifier, 64> IdentifierVector;
IdentifierVector m_identifiers;
};
ALWAYS_INLINE const Identifier& IdentifierArena::makeIdentifier(JSGlobalData* globalData, const UChar* characters, size_t length)
{
m_identifiers.append(Identifier(globalData, characters, length));
return m_identifiers.last();
}
inline const Identifier& IdentifierArena::makeNumericIdentifier(JSGlobalData* globalData, double number)
{
m_identifiers.append(Identifier(globalData, UString::number(number)));
return m_identifiers.last();
}
class ParserArena {
WTF_MAKE_NONCOPYABLE(ParserArena);
public:
ParserArena();
~ParserArena();
void swap(ParserArena& otherArena)
{
std::swap(m_freeableMemory, otherArena.m_freeableMemory);
std::swap(m_freeablePoolEnd, otherArena.m_freeablePoolEnd);
m_identifierArena.swap(otherArena.m_identifierArena);
m_freeablePools.swap(otherArena.m_freeablePools);
m_deletableObjects.swap(otherArena.m_deletableObjects);
m_refCountedObjects.swap(otherArena.m_refCountedObjects);
}
void* allocateFreeable(size_t size)
{
ASSERT(size);
ASSERT(size <= freeablePoolSize);
size_t alignedSize = alignSize(size);
ASSERT(alignedSize <= freeablePoolSize);
if (UNLIKELY(static_cast<size_t>(m_freeablePoolEnd - m_freeableMemory) < alignedSize))
allocateFreeablePool();
void* block = m_freeableMemory;
m_freeableMemory += alignedSize;
return block;
}
void* allocateDeletable(size_t size)
{
ParserArenaDeletable* deletable = static_cast<ParserArenaDeletable*>(fastMalloc(size));
m_deletableObjects.append(deletable);
return deletable;
}
void derefWithArena(PassRefPtr<ParserArenaRefCounted>);
bool contains(ParserArenaRefCounted*) const;
ParserArenaRefCounted* last() const;
void removeLast();
bool isEmpty() const;
void reset();
IdentifierArena& identifierArena() { return *m_identifierArena; }
private:
static const size_t freeablePoolSize = 8000;
static size_t alignSize(size_t size)
{
return (size + sizeof(WTF::AllocAlignmentInteger) - 1) & ~(sizeof(WTF::AllocAlignmentInteger) - 1);
}
void* freeablePool();
void allocateFreeablePool();
void deallocateObjects();
char* m_freeableMemory;
char* m_freeablePoolEnd;
OwnPtr<IdentifierArena> m_identifierArena;
Vector<void*> m_freeablePools;
Vector<ParserArenaDeletable*> m_deletableObjects;
Vector<RefPtr<ParserArenaRefCounted> > m_refCountedObjects;
};
}
#endif