/*
 * Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
 * 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 THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 THE COPYRIGHT HOLDER 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.
 */

#pragma once

#include <AK/IntrusiveList.h>
#include <AK/NonnullOwnPtr.h>
#include <AK/Vector.h>
#include <LibJS/Forward.h>
#include <LibJS/Heap/HeapBlock.h>

namespace JS {

class Allocator {
public:
    Allocator(size_t cell_size);
    ~Allocator();

    size_t cell_size() const { return m_cell_size; }

    Cell* allocate_cell(Heap&);

    template<typename Callback>
    IterationDecision for_each_block(Callback callback)
    {
        for (auto& block : m_full_blocks) {
            if (callback(block) == IterationDecision::Break)
                return IterationDecision::Break;
        }
        for (auto& block : m_usable_blocks) {
            if (callback(block) == IterationDecision::Break)
                return IterationDecision::Break;
        }
        return IterationDecision::Continue;
    }

    void block_did_become_empty(Badge<Heap>, HeapBlock&);
    void block_did_become_usable(Badge<Heap>, HeapBlock&);

private:
    const size_t m_cell_size;

    typedef IntrusiveList<HeapBlock, &HeapBlock::m_list_node> BlockList;
    BlockList m_full_blocks;
    BlockList m_usable_blocks;
};

}