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/****************************************************************************
**
** Copyright (C) 2012 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the V4VM module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Digia. For licensing terms and
** conditions see http://qt.digia.com/licensing. For further information
** use the contact form at http://qt.digia.com/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Digia gives you certain additional
** rights. These rights are described in the Digia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef QV4REGALLOC_P_H
#define QV4REGALLOC_P_H
#include "qv4global_p.h"
#include "qv4isel_p.h"
#include "qv4ssa_p.h"
#include <config.h>
QT_BEGIN_NAMESPACE
namespace QQmlJS {
namespace MASM {
class RegAllocInfo;
class RegisterAllocator
{
typedef V4IR::LifeTimeInterval LifeTimeInterval;
QVector<int> _normalRegisters;
QVector<int> _fpRegisters;
QScopedPointer<RegAllocInfo> _info;
QVector<LifeTimeInterval> _fixedRegisterRanges, _fixedFPRegisterRanges;
QVector<LifeTimeInterval> _unhandled, _active, _inactive, _handled;
QHash<V4IR::Temp, int> _lastAssignedRegister;
QHash<V4IR::Temp, int> _assignedSpillSlots;
QVector<int> _activeSpillSlots;
Q_DISABLE_COPY(RegisterAllocator)
public:
RegisterAllocator(const QVector<int> &normalRegisters, const QVector<int> &fpRegisters);
~RegisterAllocator();
void run(V4IR::Function *function, const V4IR::Optimizer &opt);
private:
void prepareRanges();
void linearScan();
void tryAllocateFreeReg(LifeTimeInterval ¤t, const int position);
void allocateBlockedReg(LifeTimeInterval ¤t, const int position);
void longestAvailableReg(const QVector<int> &nextUses, int ®, int &nextUsePos_reg,
int lastUse) const;
int nextIntersection(const LifeTimeInterval ¤t, const LifeTimeInterval &another,
const int position) const;
int nextUse(const V4IR::Temp &t, int startPosition) const;
void split(LifeTimeInterval ¤t, int beforePosition, bool skipOptionalRegisterUses =false);
void splitInactiveAtEndOfLifetimeHole(int reg, bool isFPReg, int position);
void assignSpillSlot(const V4IR::Temp &t, int startPos, int endPos);
void resolve(V4IR::Function *function, const V4IR::Optimizer &opt);
void dump() const;
};
} // end of namespace MASM
} // end of namespace QQmlJS
QT_END_NAMESPACE
#endif // QV4REGALLOC_P_H
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