/*

  * 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();

 }