StackSlotManager.hpp

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/* src/vm/jit/compiler2/StackSlotManager.hpp - StackSlotManager

   Copyright (C) 2013
   CACAOVM - Verein zur Foerderung der freien virtuellen Maschine CACAO

   This file is part of CACAO.

   This program 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 2, or (at
   your option) any later version.

   This program 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 this program; if not, write to the Free Software
   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
   02110-1301, USA.

*/

#ifndef _JIT_COMPILER2_STACKSLOTMANAGER
#define _JIT_COMPILER2_STACKSLOTMANAGER

#include "vm/jit/compiler2/Type.hpp"
#include "vm/types.hpp"

#include "vm/jit/compiler2/alloc/map.hpp"
#include "vm/jit/compiler2/alloc/vector.hpp"

namespace cacao {
namespace jit {
namespace compiler2 {

// forward declaration
class ManagedStackSlot;
class StackSlot;

/**
 * StackSlotManager
 *
 * The StackSlotManger is used to manage slots for spilled registers etc.
 */
class StackSlotManager {
private:
    typedef alloc::vector<ManagedStackSlot*>::type SlotListTy;

    SlotListTy slots;
    SlotListTy argument_slots;

    /**
     * The number of argument slots at machine-level.
     */
    u4 number_of_machine_argument_slots;

public:
    StackSlotManager() : number_of_machine_argument_slots(0) {}
    ~StackSlotManager();

    /**
     * Create a ManagedStackSlot.
     *
     * @param type The slot's type.
     *
     * @return The new stack slot.
     */
    ManagedStackSlot* create_slot(Type::TypeID type);

    /**
     * Create a ManagedStackSlot for an invocation argument.
     *
     * @param type  The slot's type.
     * @param index The index of the invocation argument for which this slot is used.
     *
     * @return The new stack slot.
     */
    ManagedStackSlot* create_argument_slot(Type::TypeID type, u4 index);

    /**
     * Assigns each ManagedStackSlot a position in the virtual frame.
     */
    void finalize();

    /**
     * @return The size of the stack frame in bytes.
     */
    u4 get_frame_size() const;

    /**
     * @return The number of actual machine-level slots.
     */
    u4 get_number_of_machine_slots() const;
};

} // end namespace compiler2
} // end namespace jit
} // end namespace cacao

#endif /* _JIT_COMPILER2_STACKSLOTMANAGER */


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