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/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* 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
* of the License, 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.
*
* $URL$
* $Id$
*
*/
#ifndef SCI_ENGINE_VM_TYPES_H
#define SCI_ENGINE_VM_TYPES_H
#include "common/scummsys.h"
namespace Sci {
// Segment ID type
typedef uint16 SegmentId;
struct reg_t {
SegmentId segment;
uint16 offset;
bool isNull() const {
return !(offset || segment);
}
bool operator==(const reg_t &x) const {
return (offset == x.offset) && (segment == x.segment);
}
bool operator!=(const reg_t &x) const {
return (offset != x.offset) || (segment != x.segment);
}
uint16 toUint16() const {
return offset;
}
int16 toSint16() const {
return (int16) offset;
}
};
#define PRINT_REG(r) (0xffff) & (unsigned) (r).segment, (unsigned) (r).offset
// Stack pointer type
typedef reg_t *StackPtr;
// Selector ID
typedef int Selector;
#define NULL_SELECTOR -1
#define PRINT_STK(v) (unsigned) (v - s->stack_base)
static inline reg_t make_reg(int segment, int offset) {
reg_t r;
r.offset = offset;
r.segment = segment;
return r;
}
extern reg_t NULL_REG;
} // End of namespace Sci
#endif // SCI_ENGINE_VM_TYPES_H
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