/*
 * 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 "StringPool.h"
#include "Strings.h"
#include "Spaces.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();
}