/*
 * 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/.
 */
#ifndef _include_jitcraft_reference_h_
#define _include_jitcraft_reference_h_

#include "Heap.h"
#include "Barriers.h"
#include "Stack.h"

namespace ke {

class Array;

// A Reference is a typed pointer to another location in memory.
class Reference : public Object
{
    void *location_;
    LocalSlot slot_;
    Barriered<Array> base_;

  public:
    static Reference *NewStack(Zone *zone, void *location, Heap::Tenure tenure = Heap::Tenure_Default);
    static Reference *NewStack(Zone *zone, const LocalSlot &slot, Heap::Tenure tenure = Heap::Tenure_Default);
    static Reference *NewArray(Zone *zone, Handle<Array> base, size_t index, Heap::Tenure tenure = Heap::Tenure_Default);

    int getInt() {
        return *reinterpret_cast<int *>(location_);
    }
    void setInt(int i) {
        *reinterpret_cast<int *>(location_) = i;
    }
    float getFloat() {
        return *reinterpret_cast<float *>(location_);
    }
    void setFloat(float f) {
        *reinterpret_cast<float *>(location_) = f;
    }

    // Begin GC Descriptor.
    static inline size_t offsetOfBase() {
        return offsetof(Reference, base_);
    }
    // End GC Descriptor.

    static inline Reference *cast(Object *obj) {
        assert(!obj || obj->is(MapKind_Reference));
        return reinterpret_cast<Reference *>(obj);
    }
};

}

#endif // _include_jitcraft_reference_h_