android_external_webkit/JavaScriptCore/parser/ParserArena.h at froyo · madmack/android_external_webkit · GitHub

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* 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 : public FastAllocBase {

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::from(number)));

return m_identifiers.last();

}

class ParserArena : Noncopyable {

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

android_external_webkit/JavaScriptCore/parser/ParserArena.h at froyo · madmack/android_external_webkit · GitHub

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