/*

 * Copyright (C) 2012 David Anderson

 *

 * This file is part of JITCraft.

 *

 * JITCraft is free software: you can redistribute it and/or modify it under

 * the terms of the GNU General Public License as published by the Free

 * Software Foundation, either version 3 of the License, or (at your option)

 * any later version.

 * 

 * Foobar is distributed in the hope that it will be useful, but WITHOUT ANY

 * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS

 * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License along with

 * JITCraft. If not, see http://www.gnu.org/licenses/.

 */

#include "Zone.h"

#include "StringPool.h"

#include "Strings.h"

#include "Spaces.h"

#include "Spaces-inl.h"

#include "Heap-inl.h"

using namespace ke;

StringPool::StringPool(Zone *zone)

  : zone_(zone),

    set_(ZoneAllocatorPolicy())

{

}

StringPool::~StringPool()

{

}

bool

StringPool::initialize()

{

    if (!set_.init(32))

        return false;

    return true;

}

String *

StringPool::add(const char *str, size_t length)

{

    StringSet::Insert i = set_.findForAdd(CharsAndLength(str, length));

    if (i.found())

        return *i;

    Local<String> obj(zone_, String::New(zone_, str, length, Heap::Tenure_Old));

    if (!obj)

        return NULL;

    set_.add(i, obj);

    return obj;

}

void

StringPool::sweep()

{

    for (StringSet::iterator i(&set_); !i.empty(); i.next()) {

        String *obj = *i;

        MarkBit bits = HeapChunk::GetMarkBit(obj);

        if (HeapChunk::IsWhite(bits))

            i.erase();

        else

            assert(HeapChunk::IsBlack(bits));

    }

    set_.checkDensity();

}